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H2S Scavenger
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
DNP-02-00-2022 Sulfide Scavenger Concentrate Organic, formaldehyde free hydrogen sulfide
scavenger (80%) concentrate
DNP-02-00-2033 Sulfide Scavenger Thermally stable methyl amine triazine
DNP-02-00-2064 Sulfide Scavenger Blended Ethanolamine formaldehyde
condensates
DNP-02-00-2100 Oil Soluble H2S Scavenger Branched alkyl triazine (100%)
DNP-02-00-2301 H2S Scavenger EDA / MEA triazine
DNP-02-00-2411 H2S Scavenger MEA balanced triazine
DNP-02-00-2414 Metal Complex for Amine Fe III Solutions with Hydrotropes Crosslink Oil Gels
DNP-02-00-2431 H2S Scavenger MEA condensate
DNP-02-00-2446 Metal Complex for Amine Fe III Solutions with Hydrotropes
Crosslink Oil Gels
DNP-02-00-2449 Metal Complex for Amine Fe III Solutions with Hydrotropes
Crosslink Oil Gels
DNP-02-00-2601 Oil Soluble H2S Scavenger Schiff base
DNP-02-00-2800 Liquid KCL Substitute Ammonium salt of an Organic Acid (70-75%)
DNP-02-00-2810 Defoamer Concentrate High molecular weight alcohol based defoamer/
Antifoamer
DNP-02-00-2815 Defoamer Conventrate Silicone based Defoamer/Antifoam concentrate
DNP-02-00-2825 Multi-purpose iron complexing Reducing agent for ferric iron in acids
DNP-02-00-2830 Calcium Sulfate dissolver Concentrated, water soluble organic
DNP-02-00-2835 H2S Scavenger Scavenger plus anionic surfactant - OS
DNP-02-00-2845 Oxygen Scavenger Ammonium by sufite solution with nickel Catalyst (70%)
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
Direct N-Pakts H2S Scavenger Properties DNP Density ~ Content Application Soluble
Product Active % #/gal pH water % Gas Oil Water In
#
2022 80 9.6 12 18 X X X water
2033 45 8.3 11 55 X X X water
2064 67 9.3 12 30 X X X water
2100 98 7.5 11
H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
HYDROGEN SULFIDE SCAVENGERS FOR:
HYDROCARBON GASES, CRUDE OIL, AND ASSOCIATED WATER SYSTEMS AUGUST 13TH 2010
The Hydrogen Sulfide Scavengers (H2S Scavengers) from Direct N-Pakt are primarily those of methylene reacted systems.
These hydrogen sulfides can be removed from the gaseous, hydrocarbon liquid, or water phases by direct treatment into the flow stream.
Also, the flow stream may purge through column known as a scrubber with fluid volume and percolate bubbles for intimate contact.
The chemical molecules can be called Schiff bases, imines, methylene bridged adducts, methylolated amines, triazines, bis-oxazolidines.
H2S Scavenger Properties
Name
At 20 C Density Aldehyde to Amine
Ratio
active
% by weight free
amine T water MEOH
pH
g/cc #/gal
2022
1.14
9.6
1 to 1.08
80
4.82
74.44
18.35
0
11.5-12.5
2033 1 8.3 1 45 nil 45 55 0 10 -11.5
2064 1.12 9.3 1 to 1.13 67 5.77 67 30.22 1.83 10.5-12.0
2100 0.9 7.5 1:01 98
H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
HYDROGEN SULFIDE OCCURRENCE AND REMOVAL AUGUST 15TH 2010
Hydrogen sulfide is a commonly occurring nasty, toxic, and lethal gas. Hydrogen sulfide is colorless.
Hydrogen sulfide must be reduced to permissible levels for safety and corrosion standpoints, typically 1 to 4 ppm (mole % basis). Severe concern is considered when H2S is above 100 ppm. Hydrogen sulfide is very corrosive when dry forming FexSX complexes, very adherent, and interferes with flow passage of gas, especially in dry gas pipelines.
Hydrogen sulfide gas occurs in wet forms in sewage drains, holding pits, and plants at toxic levels, generated from decomposition of fecal matter.
Hydrogen sulfide occurs form generation by growth of anaerobic (grow in area where oxygen is absent) bacteria called sulfate reducers (common name).
Hydrogen sulfide can be produced from the decomposition of waste, garbage, and compost domes.
Hydrogen is produced from handling of sulfur from some natural gas wells, from leakage from storage domes.
Hydrogen sulfide is produced in high quantities from natural gas and associated gas from oil wells throughout the world, especially in Canada, Southern US, Mexico, Russia, Iran and others.
Due to producing or disposal or storage of associated brine production in oil and gas production, waters accumulate H2S from handling and bacterial contamination.
Corrosion Problems: Locations:
Producing from oil/gas formation-down hole tubulars.
Wellhead flow, under high velocity.
Flowlines and gathering vessels.
Gas/oil/water separators.
Gas processing plants.
Transportation of unsweetened (H2S removed) gas.
Vapor space of liquid storage( stock) tanks.
Amine sweetening systems.
Dehydration of gas units.
Crude shipment by barge, ship, pipeline to refineries.
Crude loading and offloading systems for processing.
Crude oil towers to breakdown fractions of the oil.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
HYDROGEN SULFIDE OCCURRENCE AND REMOVAL (cont.) AUGUST 15TH 2010
H2S Scavengers:
Direct N-Pakt manufactures liquid chemical reagents to remove or lower the hydrogen sulfide content, occurring at low % or low ppms.
Direct N-Pakt supplies both chemicals and technical expertise in handling of chemicals and their applications. Direct N-Pakt can supply specialty blends for particular use.
Direct N-Pakt chemical scavengers will reduce the level of hydrogen sulfide to where corrosion can be
controlled , the IRON (Fe) sulfides can be minimized.
The solids of FexSx can cause plugging in disposal or secondary water injection systems. Oil dehydration upsets and problems can be reduced by limiting the solids, including the reaction products and the FexSx.
CHEMICALS:
Direct N-Pakt supplies liquid scavengers that are useful in treatment of natural gas, carbon dioxide with associated gas, liquid condensates or crude oil, and waters of various types, including refinery process, produced oilfield waters, sewage, drilling fluids and fracturing fluids.
Direct N-Pakt supplies H2S scavengers that are:
gas soluble
oil soluble
water soluble
Gases associated with oil and gas production usually contain CO2 (carbon dioxide), which causes an acidic pH. The addition of H2S scavengers to CO2 containing fluid can cause pH to rise sharply. The formation of calcium or magnesium carbonates and amine carbonates can occur. Direct N-Pakt H2S scavengers usually hold this to a minimum, but it does occur.
In these cases, the DNP-02-00 2022, contains a chelant. Other products and 2022 can use the addition of Direct N-Pakts high calcium tolerant phosphonates, which are both sequestrants and chelants, @ 1-2%. The common added is DNP-06-00-68441 or 68481, or 68521. These phosphonates also help to dissolve FexSx.
Formaldehyde can be added to the Direct N-Pakt line of H2S scavengers except the oils soluble; 2100, 2601, or 2835, to synergize or accelerate reaction ratios.
The use of Direct N-Pakts H2S scavengers can be coordinated with using proper Corrosion Inhibitors to mitigate even low level of H2S or in process areas not previously removed of H2S.
Technical information is supplied for the Direct N-Pakts H2S scavengers and their handling.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
H2S TREATMENT RATIOS IN VARIOUS EXPRESSIONS AUGUST 13TH 2010
Triazines supposedly react at 1 mole removes 3 moles of Sulfide (not as H2S). Molecular weight of ethanol amine triazines is 219. Reaction is 3 x 32 =96 mole weight of 3 sulfides. So 2.28 parts of triazine per 1 part of sulfide.
@ 50% active the ratio of Chemical to sulfide is 2.28/0.50= 4.56 @ 60% active the ratio of Chemical to sulfide is 2.28/0.60= 3.8
@ 80% active the ratio of Chemical to sulfide is 2.28/0.80= 2.85
Theoretical relation of standard triazine as 2151, is 1.71 # (0.14 kg/liter) removed by 1 gallon, for a ratio of 7.4
Overspent relation of standard triazine as 2151, is 1.78 # removed by one gallon, for a ratio of 4.87.
Note the overspending: Assumes 8.66 #/gallon density for 1 gallon.
@ 9.08 #/gal, 1.17=7.76 ratio. 1.78 = 5.1 ratio.
Most of the triazines use a factor of 3 to 3.3 in the calculation: Chemical [liters per day]=ppm H2S x MMscf/d divided by factor.
This is 0.333 to 0.303 for LPD or 0.088 to 0.08 GPD
1 Liter of scavenger will remove 3.2 ppm of H2S from one MMscf gas. 0.5 Liter of scavenger + 0.5 liter of 37% formalin will remove 5.6 ppm H2S from one MMscf gas. I gallon of scavenger will remove 12.1 ppm of H2S from one MMscf gas.
16 ppm H2S will be removed from one MMscf gas per gallon of scavenger.
1 gallon= 16/ppm H2S/ MMscfd gallons/day= 0.0625/MMscfd/ppm H2S 1/16=0.0625 x 3.785 = 0.2366 liters/ppm H2S/MMscfd 1/14=0.0714 x 3.785 = 0.2704 liters/ppm H2S/MMscfd 1/21=0.0476 x 3.785 = 0.18 liters/ppm H2S/MMscfd 1/47=0.0213 x 3.785 = 0.08 liters/ppm H2S/MMscfd Liters/day per 3.785 liters/gallon = 0.2642 gallons/day
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
Most Efficient H2S Scavengers
August 14th 2010
The question comes from which are the most effective and which are the fastest and which are best suited for what system.
The first question is how they exist:
Schiff Base Imine Methylene Bridge Triazine Other
The steric hindrance can interfere or control rate. Rate controls efficiency.
Methyl amine CH3NH2 AEW=31
Ethylene diamine H2NCH2CH2NH2 view as dimer of methyl amine. AEW=30
Ethanolamine- HOCH2CH2NH2 AEW=61
Diethanolamine- [HOCH2CH2]2NH AEW=105
Di-n-butylamine [CH3CH2CH2CH2]2NH AEW=129
Rohm & Haas Primene 81-R C12-14 tertiary carbon, primary amine or similar
Hypothesis can be forever and techniques to test structure are eluding.
The reactant is methylene [CH2] to form a stable reaction product. Therefore the molecule must use its amine for capture and the methylene must be easily released in the system. The system can be gas, hydrocarbon liquids, aqueous liquids, or mixtures. The methylene of formalin is the most reactive.
For towers, the product density has a physical effect, as well as it should not easily carry with the gas if radial velocity is exceeded. Considered the most for money is MEA triazine or this MEA/CH2O reaction
product mixed with formaldehyde, if local restrictions or companies allow.. Some have discussed DEA as some improvement. EDA can be used as well.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
Most Efficient H2S Scavengers (cont) August 14th 2010
For Line Injections consider as: Towers as well
DNP Soluble In
CH2O Rxn Product
#
CH2, % Gas/Air Hydrocarbons Water
Methylamine 2033 13.84 yes yes yes
MEA 2022 14.28 nil nil yes
MEA 2064 11.71 nil nil yes
MEA 2151 9.46 nil nil yes
MEA 2411 9.94 nil nil yes
MEA 2431 9.13 nil nil yes
MEA/EDA 2301 15.41 slight slight yes
DEA -------- -------- nil slight yes
di-n-butylamine 2601 8.4 yes yes slight
Primene 81-R -------- -------- yes yes slight
Amine 2100 19.4 yes yes slight
37% Formalin -------- 17.27 yes yes yes
MEA 2835 5.71 nil yes slight
It must be noted that the reaction products continue to react, saying reaction products react further. The form sought is S-S-S or maybe S-S-S-S-S. This is achieved from the (CH2-S) n, where n= most
commonly 3 and 4.
Trithiane is usually present in small quantities. CS2 is present and dithianes.
MEA is typically the lowest cost. MMA is expected to perform but may be too volatile for most producers to handle.
Original formulas were formalin with DEA added.
Gatlin has patent on DMAPA assigned to WFT, Dimethylaminopropyl triazine, also made by Taminco.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
FORMALDEHYDE AMINE REACTIONS with CONDENSATIONS and LIQUIDS 15th August 2010
The reaction of formaldehyde, including formalin (37% inhibited with 3 to 25% methanol), 49-51% tackifier grade, or methyl formcel (normally 55% formaldehyde in 35% methanol and 10% water) with primary or secondary amines is an exothermic condensation to form methylol groups, Schiff Bases, methylene linkages as Triazines or Oxazolidines, methylene bridge condensates, and other impurities.
Primary constituents: of ethanolamine
1. 1,3,5 Triazine-1,3,5 (2H, 4H,6H) triethanol CAS # 4719-04-4
Oxazolidine CAS # 504-76-7
Impurities:
1. Trimethylene glycol Monomethyl ether CAS # 1589-49-7
2. Dimethylethanolamine CAS# 108-01-0
3. Acetamide, N (2-hydroxyethyl) CAS # 142-26-7
Formaldehyde polymers (polyoxymethylene)
The primary constituents are present as shown or as mixtures in equilibrium with the methylol or Schiff forms, as these reactions are run as solution combination and not as dehydrating (water removal). The reaction can be run with tertiary amines but forms quaternary type bases, which are very alkaline and unstable.
HANDLING:
Formaldehyde is easily handled and monitored due to its odor and low level of detection. Suitable method should be set to specifically identify any low level presence.
Adequate cleaning of any possible spills should be available separate from all other containment systems. Ethanolamine/water mixture rapidly destroys small quantities of formaldehyde. Sodium or Ammonium Bicarbonate assist in handing large spills. Formaldehyde is acidic about 3.5 to 6.5 pH, depending on free acid present.
Trace contaminants can cause excessive changes in final product distribution, and especially insoluble residue polymers, not easy to remove, causing suspended particles and turbidity.
Formaldehyde should be stored under pressure or in equalization of water or amine or bicarbonate scrubber at < 110 F if possible, and > 45 F. At lower temperatures the appearance and settling of paraformaldehyde, should be dispersed prior to use. The use of the higher 12-15% methanol inhibited grade can be helpful, but the 7% grade is preferred. Warming of formalin prior to use is not required.
The most common linkage is methylene bridge to produce the Triazines, oxazolidines, Schiff bases, methylol adducts all commonly called amine aldehyde adducts. Most common adjunct additives are formaldehyde, acetaldehyde. Acetadol.
Amines vary but are as such: Acetaldehyde ammonia, alkyl amines and polyamines, hydroxyalkylamines, and ether amines.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
STORAGE, REACTION, and STRUCTURE of H2S SCAVENGERS
15TH AUGUST 2010
STORAGE:
Preferably store liquid H2S scavengers by controlling the temperature at 105 +/- 10 F. Storage above these temperatures need to be stabilized blends. The color of material should be colorless to a faint yellowish tint. Keep the storage from direct light if a drum or tank. If Totes are used and are transparent keep from any Ultraviolet Light. Maintain a positive pressure against tank vapor outlets to inhibit breakdown and release of any aldehydes, especially odors.
STRUCTURES:
Comments:
Triazines are an unstable form. Normally it has been assumed that Oxazolidine or Triazines are the color constituents. The color constituents are deemed results of oxidation and heat. If the triazine exists then assume it is a formyl [2, 4 6- formyl-1, 3, 5-hydroxyethyl-1, 3, 5-S-triazine (with the 1:1 molar reaction ratio.)]
Diimines are very possible. These are the Schiff bases or the similar to even though we are talking of tautomer forms.
The imines or enamines of tautomers (C=N or C=C), acetals, hemi-Acetals, and amine/acetals, or dimers or polymers (i.e. multimer).
Patent by Pounds and Cherry claim the product composition of glyoxal and amines are unknown, no triazines or imines are present (WO1996005907).
Weers identifies reaction species are methylene bridge materials.
REACTION:
The reaction of the imines, Schiff bases, enamines, Aldehydes, Triazines, oxazolidines, Acetals, hemi-acetals, and the new coined term of methylene bridged reaction products are through the
CH2--, methylene group.
Therefore the amine is the absorbing agent or capturing agent. It is known that the excess amine is not required for effective reaction. Currently Ethanolamine Triazines are mixed 50% with formalin and increase reaction by 2 times.
Early products of industry used formalin with about 2 to 9% volume of diethnaolamine, triethanolamine, hydroquinone and others.
So the methylene reacts with the H2S , mercaptan, or other sulfur compounds and the amine is liberated.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
STORAGE, REACTION, and STRUCTURE of H2S SCAVENGERS (cont.)
15TH AUGUST 2010
COMPOSITIONS:
SO WHAT IS THE MOST EFFECTIVE H2S SCAVENGER?
Simply: The smallest and least hindered molecule. 1. Methylamine=CH3NH2 MW= 31. 2. 1, 3, 5 S-triazine= (CH2)3[CH3N] 3 MW= 129, trimer, EQ= 29 3. 1, 3, 5-hydroxyethyl-1, 3, 5-S-triazine MW= 219, trimer, EQ= 73
4. Acetaldehyde ammonia trimer (CH3CH) 3 (NH) 3 MW=129, trimer, EQ=43 5. [2, 4, 6-formyl-1,3,5-hydroxyethyl-1,3,5-S-triazine], MW= 303, trimer, EQ=101
The reactant activity is assume as 2 for 1 since one methylene and one aldehyde, so EQ= 50.5
6. (2:1 molar amine/Ethanedial) [HOCH2CH2N]2=CH-CH=, MW=144, dimer,EQ=72 7. Ethylene diamine = [H2C=NCH2CH2N=CH2] , MW=84, dimer, EQ= 42.
Aldehyde % Reaction
Product Activity % Active EQ Ratio
MeAm/CH2O 37 27 31 115
MeAm/CH2O 50 31 31 100
NH3/CH2O 50 36 29 81 *
MEA/CH2O 37 49 73 149
MEA/CH2O 50 57 73 128
MEA/CH2O 93 72 73 101
CH3CH2/NH3 100 69 43 62
MEA/GLY (1:1) 40 34 50.5 148.5
MEA/GLY (2:1) 40 71.5 72 101
EDA/CH2O (2:1) 37 48 42 87.5
EDA/CH2O (2:1) 50 57 42 74
*not reproducible with anhydrous ammonia.
#4 and #8 compare, meaning, versus a standard MEA triazine that is 1:1 MEA to formalin.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
SULFUR IN OIL PROPOSAL
Sulfur is non polar.
Sulfur is dissolved or chemisorbed into crude oil.
AUGUST 14TH 2010
Samples of solids extracted from oils can be subjected to magnet to see if associated Fe will separate. Apply the magnet direct to the crude oil.
Sulfur in molecules is normally:
Sulfur in the (-2) oxidation state
Sulfur dioxide
Mercaptans as methyl, ethyl, propyl, aryl and others as linear or branched thiols)
H2S -reduced
SO4(sulfates)
Dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide & other dialkyl sulfides
RS-SR (disulfides).
Carbonyl sulfide
Carbon disulfide
Thiophenes
Benzothiophenes
Ionic polysulfides
What is the per cent of S8?
Sulfur is soluble @ 50% in carbon disulfide (CS2).
Sulfur is soluble @ 2.5% in acetone.
A desalting process offers the advantage of using NaOH or KOH with the washing action. Also the proper surfactant can be used. Possibly an oil dispersible aldehyde can react with the caustics, lithium, sodium, or potassium to form the sugars or carbohydrates insitu.
An oxidizer may be included in a wash step and convert mercaptans to dialkyl disulfides. Drawback is dialkyl sulfides will not remove by this method. US patent 3,449,239.
A relatively standard method is to dissolve sulfur with strongly alkaline Na2S to form Na2S2. The sulfur exists in chains terminating with negative charges. Acidification of such a solution yields a mixture of hydrogen polysulfides (sulfuranes) and chain compounds that will decompose to sulfur and hydrogen sulfide. Dialkyl disulfides (C4 to 22 carbons) [Merox are normal] with amine (4 to 12 carbons) additive as
Diethylamine or N-alkyl-1, 3-propane diamine. US patent 4,239,630. Sulfur reacted disulfide. 15.5 lbs. sulfur per barrel solvent @ 75F. US patent 3,531,160.
NMP and M-Pyrol will reduce films and disrupt crystal liquid interface.
Sulfur is soluble in M-Pyrol. H2S is soluble in M-Pyrol @ 32 volumes.
Maltose is a stabilizer for polysulfides. Sodium Borohydride reacts with disulfides; will hydrogenate double bonds or nitriles.
Triethylamine [Et3N]-pyridine. [0.11/0.89]. High solubility of H2S.
Sulfur is 30 times less soluble in ethanol than in pyridine at 20C. McGill Univ. Montreal, Quebec.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
SULFUR IN OIL PROPOSAL (cont.)
AUGUST 14TH 2010
Amines. Chemical solvents. Solvent absorption. Methyl Amine. CH3NH2. Available as 40% solution. MDEA. Methyldiethanolamine. MDEA oligimers. DNP-02-00-2900. MEA. Monoethanolamine. DEA. Diethanolamine THEED. MDEA dimer (trihydroxyethyl ethylene Diamine). BHEED. Bis (hydroxyethyl) Ethylenediamine. DMEA. Dimethylaminoethanol reacts with H2S. DMIPA.Dimethylisopropanolamine, neutralizes HCl and is not affected by H2S making it a neutralizer In sour crude or overheads. [patent by Betz Laboratories]
TEA. Triethanolamine will not improve contact with H2S, COS, RSH, RS-SR, reactive sulfur, other organic sulfides. Piperazine. Diethylethanolamine. 1-formylpiperdine. With M-Pyrol (Purisol process)
Alkanolamines are unable to absorb dialkyl sulfides, since the lack of an acidic proton. Alkanolamines are very inefficient in absorbing thiols (mercaptans)
Ethers. Dialkyl ethers of polyethylene glycols, Selexol. US patent 4,336,233.
Polyalkylene glycol and polyalkylene glycol ethers. US patent 5,582,714.
Washing the extracted hydrocarbons.
Diethylene glycol and triethylene glycol-to remove sulfur compounds, oxygenates, and C4-C6 olefins.
US patent 5,689,033.
Amine Ethoxylates. EO-fatty amine. Improves contact with H2S, COS, RSH, RS-SR, reactive sulfur, and other organic sulfides.
Example-2:2:1; Fe, Fe/Cu, Zn; EO-NR, H2S.
Dienes. Cyclopentadiene is soluble in CS2 and polymerizes to dicyclopentadiene.
Olefin-Amine: US patent 5,567,212 and 5,567,213 Produce an aldol condensation-aldimine or aldolimine. Produce unsaturated ketone or aldehyde. Prefer amine not > 4 carbons. Amine is primary. Prefer amine has an alcohol group.
Scavenges H2S and sulfur. Operates by insertion into the double bond (olefinic).
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H2S Scavenger Series
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SULFUR IN OIL PROPOSAL (cont.) AUGUST 14TH 2010
Aldehydes and Aldehyde reaction products:
Butyl formcel (Celanese)-53% butanol, 40% formaldehyde, 7% water.
Ethylene glycol hemiformal= 1,6-dihydroxy-2,5-dioxahexane US Patent 7078005
DMAPA + paraformaldehyde.
DNBA + paraformaldehyde, less reacted=precursor to methyl di-n-butylamine, bis-di-n-butyl menthane. Contains free CH2O oligimers. DNP-02-00-2601
Cyanuric acid. Acidic phenolic alcohol-aldehyde. Used in swimming pools and also chlorine
derivatives. Melamine will precipitate it.
DNP-02-00-2333 EDA/formalin
DNP-02-00-2301 EDA/MEA/CH2O triazines
Hexamethylol melamine. Melamine + formaldehyde.
Hydantoin-glycol urea. Imidazolinedione
DMDM Hydantoin.
Bridged methylene polyamines (not Triazines). See US patent 5,284,576. Does not list sulfur.
Bridged methylene polyamines under non-dehydrating conditions. US patent 6,024,866.
Does not list sulfur.
Gamma-butyrolactone(BuL)
Formaldehyde, 37%.
Stabilized CLO2.
1. Make a solution of 80% sodium chlorite of 31.25% to equal 25% solution.
Dilute this stock solution before field use.
Bleach: sodium hypochlorite 7.5 to 12.5 % soln. Metal Chelates: Fe, Cu, Co, Mn, Cr, V, Zn Or also Ru, Os, Rh, Ir, Ni, Pd, Pt, Ag, Au, Cd, Hg, Al, Ga, In, Tl, Ge, Sn, Pb, Sb, and Bi.
Surfactants to assist these: alkyl, Hydroxyalkyl, quaternary ammonium, polyether, phenol, alkyl phenol, ethoxylated phenol, amino compounds, carboxylic acids and their salts, and sulfonic acid salts. See US patent 6,531,103.
H2S is converted to sulfur directly by passing through solution of Fe (III) EDTA. Fe (III) EDTA- + [O] + H2S= Fe (EDTA) (=) + H2O + S|
Note the oxygen is needed. Also shown is: H2S + 2 Fe [+3] = S (0) + 2 Fe (2+) + 2 H (+)
Possibly Erythorbic acid in ammonium bisulfite to inhibit oxidation and to chelate the Fe.
Iron sulfide clusters in polar solvents are [4Fe-4S], [3Fe-4S], and [4Fe-2S], in nonpolar are [8Fe-7S].
Glyoxal: dimer aldehyde, typical 40% solution in water. Used by Clariant and Servo. See US patent 4,680,127.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
SULFUR IN OIL PROPOSAL (cont.) AUGUST 14TH 2010
Reactive groups:
Alpha olefin epoxides (glycidols), varying chain lengths, including epichlorohydrin. Ethylene imines.
Buffered Sodium Nitrite: Sodium Nitrite has been used in Exxon/NL Sulfa check. Normally used in towers. Now finds use as for continuous injection. See US patent 4,515,759.
Carbon Disulfide:
With surfactant, DNP-03-00- 3050. CS2 is heavier than water.
Surfactant Cationic type: Quaternary Benzyl Ammonium Chloride in US patent 5,744,024. This discloses the Methylamine Triazine using 5 to 10% QAC. Best is Cocodimethyl like DNP-08-00-8080. Also is Soya dimethyl like DNP-09-00- PS9.
Surfactant Anionic type: SLS-sodium lauryl sulfate.
SLES-sodium lauryl ether sulfate.
Possible solvent group are formamides:
Formamide
N-methylformamide
N,N-dimethylformamide
Solvents: aromatic hydrocarbon
Alkyl naphthalene mixture containing 70-90% C1-C4 napthalenes, 5-15% higher boiling napthalenes, contains no more than 10% weight of naphthalene.
Has IBP of 230C, flash point > 101C, freeze point< 0C.
US patent 4,322,307.
Alkali, ammonia, or amine solutions with H2S form sulfides and bind elemental sulfur as polysulfide. Surface active agents added to improve sulfur binding properties.
German patents.
Liquid hydrogen sulfide US patent 3,393,733.
Carbon disulfide Canadian patent 771,129.
Organic sulfides and disulfides.
Extraction with oils and then WASH with alkali hydrogen sulfide solutions or Alkanolamine solutions.
In this procedure, surface active substances are used as emulsion breakers and to facilitate the transfer of sulfur from the organic phase into the aqueous phase. German patent 2,707,057.
Do not use benzene, toluene, xylene, kerosene, or diesel oil.
Dimethyl sulfoxide. DMSO.
Thiourea.
Borated Thiourea, amine salt.
Due to strange nature or density of solids and variable composition, the use of ether amine tetraphosphonic acid is recommended to polarize the iron and break the bonded sulfur. The acid for is DNP-06-00- 68461, sodium salt, pH of 4 is 68441, and ammonium salt, pH of 7 is 68561.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
Anthony M. LatorreImage
H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
LOWEST MOLECULES
METHANE CH4 Simplest hydrocarbon of natural gas
METHANOL CH3OH Oxygenated methane alcohol of methane ( +O)
FORMALDEHYDE HCOH or Dehydrogenated methanol (-2H)
INHIBITED CH2O HCOH /
30 TO 55% HCOH with
FORMALIN CH3OH 7 to 35% CH3OH
REACTIVE SOLUTION
Water : H2O or HOH always H+ & OH-
Hydrogen : H2S or HSH low pH H2S (molecular) Sulfide neutral pH H+ + HS-
high pH 2H+
+ S2-
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
REACTION MECHANISM
Reactivity of Buffered or Amine / Aldehyde Condensates Reactive side is (CH2) methylene, not CH2O, or the R groups however large. Only if R groups contain multi-CH2 groups Aldehyde does not have to be completely reacted to obtain optimum results Early products were formaldehyde with small buffer quantities of MEA, DEA, TEA, Morpholine residues or Soda Ash (Na2CO3)
Buffers delay or alter voluminous production of trithiane.
Ideal structure: HOCH2NH2 (formaldehyde plus Ammonia)
Do not capture. Hexamine is mixture of Ammonia / Formaldehyde oligimer.
4 moles 6 moles
TYPICAL REACTION PRODUCTS of AMINE/ALDEHYDE
RNH2 + CH2O RNHCH2OH
alcohol, amine methylolated amine
or RCHO R N = CH2 - H2O SCHIFF BASE / IMINE
hexahydrotriazine trimethylene triamine
H on carbon might be methylated (CH3) with excess formaldehyde
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cyclic polysulfides
H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
H2S REACTIONS with AMINE/ALDEHYDE CONDENSATES
R - NHCH2OH + H2S R - NHCH2SH
R N = CHSH
R N = C = S
Thioalcohol or / Mercaptan
unstable
C (S C) x (C S) x
C S C S C
linear polysulfides
H2S SCAVENGERS CORE PRODUCTS
DNP-02-00-2022 HOCH2NHCH2CH2OH / [ CH2NCH2CH2OH ]3
DNP-02-00-2033 CH3NHCH2OH/[CH3NCH2]3
DNP-02-00-2110 [ R N CH2 ] 3
DNP-02-00-2301 R1 NH R NHCH2 NHCH2CH2OH
DNP-02-00-2431 HOCH2NHCH2CH2OH / H2NCH2CH2OH
DNP-02-00-2601 [ CH3 (CH2)X ] Y N R Z
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
H2S SCAVENGER TREATMENT PROBLEMS 14TH AUGUST 2010
Watch system variations:
Dew point
Gas composition
Production, gas rate
Condensate
Oxygen
Triazine:
The conversion from the semi-stable methylene forms or Schiff base or imine to a Triazine can
occur or does when admixed with water..
Does methanol addition slow this?
It slows any transition.
Premature change of fluids. Cause:
Is there an appearance or change in reaction products?
Is there any FexSx present?
Is there any air or oxygen changing the result?
Any polysulfides? S-CH2-S-CH2-S or S-S-S?
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
FORMADELHYDE
Very reactive
Does not Bioaccumulate
Does not remain in the environment
Reacts with alkali controlled to alkali formates (salts) generate methanol by-product.
Reacts with alkali controlled to carbohydrates, 3 to 6 carbon hydroxy, aldehyde terminated sugars.
Reacts with amines in excess to form methylated (CH3) amines
Reacts with H2S to form trithiane
Reacts with Mercaptans
SIMPLY
COLORLESS IS EXCELLENT
YELLOW
IS
VERY GOOD
ORANGE
IS
GOOD
RED
IS
FAIR
PURPLE
IS
POOR
As color increases, the consumption and the reaction time increase. Product is
then stable to acid and heat. Will scavenge H2S in acid.
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
MOLECULAR WEIGHT AND ACTIVITY
DNP
Product# Nominal Activity Molecular
Molecular Weight as
2022 219 80% 273
2411 219 52% 421
2033 129 45% 287
REACTIVE COMPARISON
#/Product per
Product # Ratio #/H2S
2022 1:01 4.13
2:01 8.26
2411 1:01 5.00
2:01 10.00
2033 1:01 3.00
2:01 6.00
3:01 9.00
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H2S Scavenger Series
Specialty Chemical Manufacturing, Marketing, & Distribution
RULES OF THUMB FOR H2S SCAVENGING FACTOR
AUGUST 14TH 2010
Below the ratio of chemical used in ppm ratio of volume to mole ppm H2S is listed. The factor is the number required to fit the equation for direct calculation.
Ratio
Chemical (0.01)
Per ppm
H2S Factor Liters Gallons
25 0.25 95 25 water, low mix
11.89 0.1189 45 11.89 high fluid O/W
7.93 0.0793 35 7.93 high H2S
6.3 0.063 24 6.3
6.08 0.061 23 6.08 typical injection
5.8 0.058 22 5.8
4.76 0.048 18 4.8 towers
4 0.04 15 4 using CH2O in blend
2.11 0.021 8 2.11 lowest known
gals/dayH2S scavenger =
factor x 0.01 x MMscfgas x ppmH2S
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