New Patents 1035

,/o____,

I ~ Z 4 . I, ~z° as ................ _72

. . . . . . . . . . . . . . . .

Apparatus for determining a concentration of An improved process for the production of a gas hydrogen peroxide in an aqueous solution mixture containing hydrogen and carbon mono- featuring (A) a sampling system, (B) a reaction xide by endothermal partial oxidization of an or- system, (C) an oxygen concentration deter- ganic compound with steam and/or carbon mining system, (D) an automatic calibration sys- dioxide is disclosed wherein at least a portion of tern and (E) a sequence circuit system. One cycle the heat required for the partial oxidation is ob- of determination consists of three operating tained by direct heat exchange with products ob- stages. In the first stage, a zero point adjustment tained from the gasification of a carbonaceous and a span adjustment are established to pro- ash-forming fuel with oxygen in the presence of perly calibrate the sensitivity of an oxygen detec- steam. tor, air saturated water or a fresh sample being used as the standard. In the second stage, a sam- ple is introduced and hydrogen peroxide in the 4430176 sample is decomposed with a hydrogen peroxide decomposing agent. The concentration of oxy- E L E C T R O L Y T I C P R O C E S S F O R gen dissolved in the sample is then determined by P R O D U C I N G H Y D R O G E N means of the oxygen detector. In the third stage, P E R O X I D E the reaction vessel is washed with fresh water or a fresh sample after the discharging of the used John B Davison assigned to Occidental Chem- sample. Determinations are repeated at a pre- ical Corporation determined time interval under the control of the sequence circuit system. Preferably, an oxygen " ~'~" probe is used as the oxygen detector and a cata- -~ ~ ~ ; : ~ lase solution is used as the hydrogen peroxide i?,\ decomposing agent. . ~ ~,

N N

4430096 ~ ,~

P R O C E S S F O R T H E P R O D U C T I O N O F G A S

M I X T U R E S C O N T A I N I N G An electrolytic process for producing hydrogen H Y D R O G E N A N D C A R B O N peroxide in an aqueous alkaline solution in-

M O N O X I D E V I A T H E dudes simultaneously passing an aqueous alkaline electrolyte and oxygen through a fluid

E N D O T H E R M I C P A R T I A L permeable conductive cathode comprising O X I D A T I O N O F O R G A N I C reticulated vitreous carbon foam, separating the

C O M P O U N D S fluid permeable conductive cathode from an anode by a barrier and connecting the fluid per-

Friedrich Schnur, Boy Cornils, Josef Hibbel, meable conductive electrode and the anode with Bern-Hard Lieder, Oberhausen, Federal an external power source to cause generation of Republic Of Germany assigned to Ruhrchemie hydrogen peroxide ion within the aqueous Aktiengesellschaft alkaline solution.