New Patents 153

An asphalt recycling system and process are in- corporated into an existing batch type asphalt plant. The existing asphalt plant has an ag- gregate dryer and air discharge ducts connected to a filtering system. A recycling dryer has input ducts connected to the existing aggregate dryer discharge ducts and output ducts connected from the recycling dryer back to the existing ducts to the filtering system. A recycle feeder bin for feeding reclaimed asphalt pavement to the recycle dryer is connected to the recycle dryer. A recycle booster burner is operatively connected to the recycle dryer through the input duct to the dryer for providing additional heat to the recycle dryer so that the waste heat from the existing ag- gregate dryer and the booster burner provide a predetermined heat to the recycle dryer for heating the asphalt material. A recycling storage bin or silo is connected to receive the heated recy- cled asphalt from the recycle dryer. A hammer- mill or other means may be provided for breaking up the old asphaltic materials, such as old paving materials prior to entry of the material into the recycle dryer. Dampers are pro- vided for directing heated gases from the existing batch type asphalt plant to the recycling system. as needed, and temperature controls are utilized to control the recycled booster burner to provide the right combination of existing waste and ad- ded heat for the recycled dryer. The stored recy- cled asphalt materials may be fed to an existing plant batching tower for batching and loading into vehicles.

4480691

RECYCLED FATTY ACID CRUDE PETROLEUM RECOVERY

PROCESS

George Herter, Christia Herter

A method of recovering crude oil for subsequent processing. The method contemplates the step of exposing the source of crude oil such as a sub- terranean petroleum reservoir or a vessel or con- tainer of tar sands, kerogen or the like to aliphatic or carboxylic acid, preferably oleic acid, to produce a solvated crude oil mixture of reduced viscosity. This mixture is saponifyed by reacting it with a nucleophilic base, preferably a hydroxide of potassium or sodium, under pre- ssure whereby to separate the solvated mixture into petroleum crude and an acid soap which migrates to an aqueous phase. The petroleum crude is separated from the aqueous soap through conventional techniques. Afterwards, a desaponification step contemplates recovery of the aliphatic or carboxylic acid for subsequent recycling in the previously mentioned exposing step. Reuse is facilitated by desaponifying aqueous soap within a high pressure contain- ment vessel reacted with an acid suitable for donating a hydrated proton to the aqueous phase of the soap. This reconstituted acid is recy- cled for injection into the inputting step. Pre- ferably carbonic acid is generated for the desaponifying step by injecting high pressure carbon dioxide within the containment vessel. By-products of the chemical reaction are separated and/or filtered as necessary to ef- fectuate necessary purification sub-steps.

4480922

RECYCLING APPARATUS FOR PARTICULATE ASPHALTIC

CONCRETE

Robert L Mendenhall

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An improved recycling apparatus for particulate

154 New Patents

asphaltic concrete comprises a rotatable drum in which the particulate composition is gradually heated between an input end and an output end having a retractable chute extending into a port at the output end for recovering composition of a selected temperature. The chute contains a tem- perature sensing device, and the apparatus pre- ferably includes a drive means for inserting or retracting the chute, and thermostat means for selecting a product temperature whereby the drive means causes the chute to be extended into the drum to recover the composition of a selected temperature. In another embodiment, the drum includes first, second, and third lifters each ex- tending along different respective lengths of the drum interior to achieve different exposure of the particulate composition to the heating gases in the drum in the respective different drum sec- tions to achieve improved heating and mixing efficiency.

4481039

METHOD FOR RECYCLING ASPHALTIC CONCRETE

Robert L Mendenhall

An improved process for recycling asphaltic concrete comprises introducing asphaltic con- crete particles at one end of an elongated rotating drum while supplying flame and hot gases of combustion to the drum at the opposite end, and introducing virgin aggregate into the drum intermediate the two ends. The asphaltic concrete is heated as it travels along a portion of the length of the drum and is recovered just prior to reaching the position along the drum length at which the aggregate is introduced. The aggregate is heated as it travels toward the end of the drum at which the flame and hot gases are introduced. Heated aggregate may be returned to the drum for further heating, and may be directed to the opposite drum end and mixed with the asphaltic concrete in a section of the drum.

4483742

LIQUID SOAPS COMPRISING PINE OIL AND SOAP-MAKING

ACID FOR USE IN PAPER- RECYCLING

Peter Bridle, London, United Kingdom assigned to SCM Corporation

The present invention relates to liquid soaps for use in paper re-cycling and other industrial cleaning or scouring processes. The liquid soap comprises an aqueous partially saponified mix- ture comprising 1 part of pine oil (a mixture of terpene alcohols and hydrocarbons) and from 1 to 20 parts of a soap-making fatty acid, such as tall oil or distilled oil. The mixture is preferably saponified by use of 30% sodium hydroxide solu- tion. The liquid soap may contain less than 10% water.

4484377

SHREDDING MACHINE FOR RECYCLING TEXTILE FIBERS

AND METHOD

Andre Morel, La Croix du Mont, France as- signed to Constructions Mecaniques F LaRoche & Fils

An improved waste shredding machine and method wherein insufficiently shredded waste is returned to the shredding machine.

4484458

APPARATUS FOR CONDENSING LIQUID CRYOGEN BOIL-OFF

Ralph C Longsworth assigned to Air Products and Chemicals Inc

An apparatus for condensing cryogen (e.g., helium) boil-off in a confined space such as the neck tube of a helium cryostat comprising a