Patents Examined by Wilbur L. Bascomb, Jr.
  • Patent number: 4402796
    Abstract: This invention relates to a method of separating close-boiling chlorosilanes from mixtures by employing the technique of liquid extraction with sulfolane and a hydrocarbon compound as co-solvents. The hydrocarbon compound employed is substantially immiscible in sulfolane and is present in sufficient amounts so that two liquid phases are formed, one being suloflane-rich and the other being hydrocarbon-rich. The mixture of chlorosilanes is intimately mixed with the two solvents and allowed to partition between the two phases. The preferred liquid extraction procedure is where the sulfolane and hydrocarbon solvent are in a countercurrent relationship within an extraction tower. Experimentally determined selectivity coefficients show that mixtures of (1) dimethyldichlorosilane and methyltrichlorosilane, (2) phenylmethyldichlorosilane and phenyltrichlorosilane, and (3) trimethylchlorosilane and tetrachlorosilane can be successfully separated by the techniques of this invention.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: September 6, 1983
    Assignee: Dow Corning Corporation
    Inventors: Ollie W. Marko, Stefan F. Rentsch
  • Patent number: 4402792
    Abstract: An apparatus and method for producing alcohol fuel in an efficient and continuous manner are provided. The apparatus and method utilize otherwise lost heat to reduce the amount of heat required to convert feed stock into alcohol fuel. The apparatus and method utilize the supply of feed stock from a hopper through an auger to a cooker vessel, and then in turn to enzyme and fermenting tanks or vessels, which in turn discharge fermented mash to a strainer for separation of the alcohol beer from the mash. The beer is then discharged to a level controlled beer tank which regulates a residue valve controlling the amount of residue liquid returned to the apparatus and maintained under process. From the beer tank, the flow of the beer is regulated by passage through a non-clogging control valve into a reflux column.
    Type: Grant
    Filed: July 25, 1980
    Date of Patent: September 6, 1983
    Inventors: Floyd E. Horst, Robert M. Krieder
  • Patent number: 4401517
    Abstract: A vapor-liquid extractive distillation process utilizing a dialkyl sulfone containing 4 to 8 carbon atoms per molecule and at least one percent water as the solvent. The process according to this invention is of particular applicability in separating aromatics from nonaromatics in a BTX stream. The solvent system operates particularly well with relatively large amounts of water.
    Type: Grant
    Filed: November 20, 1981
    Date of Patent: August 30, 1983
    Assignee: Phillips Petroleum Company
    Inventor: Fu-Ming Lee
  • Patent number: 4401514
    Abstract: A method of recovering or extracting chemicals, such as furfural, formic acid, acetic acid and other organic compounds from acidic hydrolysates of plants or vegetable matter, especially spent sulfite liquors after conversion of the pentosans into pentoses and then into furfural by heating the hydrolysate in an acidic environment. The conversion of the pentosans pentoses into furfural, preferably with acidulation, is accomplished in a counterflow or countercurrent flow heat exchanger and a reactor, preferably a tubular reactor. The hydrolysate which has additionally been heated and converted in the reactor is used as a heating medium or heat carrier for heating up the hydrolysate which is converted in the counterflow heat exchanger, whereupon there is recovered as the distillate furfural in conjunction with the formic acid, acetic acid and the like.
    Type: Grant
    Filed: March 18, 1981
    Date of Patent: August 30, 1983
    Assignee: Vereinigte Edelstahlwerke AG (VEW)
    Inventors: Walter Kanzler, Johannes Schedler
  • Patent number: 4401515
    Abstract: In a process for producing butadiene or isoprene having a high purity comprising a step of treating a C.sub.4 or C.sub.
    Type: Grant
    Filed: March 11, 1981
    Date of Patent: August 30, 1983
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Masatoshi Arakawa, Kazuyoshi Nakazawa
  • Patent number: 4400241
    Abstract: A novel composition, and extraction process for the dehydration of a hydrated aliphatic, monohydric alcohol to produce a fuel grade alcohol. A select group of alkali-metal and alkaline-earth metal salts are added to and dissolved within a low volatility polyhydric alcohol to form a solution, or solvent extractant, and said solvent extractant contacted and dissolved within said aliphatic, monohydric hydrated alcohol, the solvent extractant distilled, condensed, and a dehydrated fuel grade aliphatic monohydric fuel grade alcohol recovered.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: August 23, 1983
    Assignee: Improtec
    Inventors: David G. Braithwaite, Thomas Cheavens, Jason M. Voyce
  • Patent number: 4399000
    Abstract: Alcohol substantially free of water is produced by a process comprising extracting an aqueous alcohol solution with an organic solvent system containing an extractant for said alcohol thereby forming an organic solvent-alcohol phase and an aqueous phase, and vacuum distilling said organic solvent-alcohol phase thereby obtaining the product alcohol substantially free of water.
    Type: Grant
    Filed: October 7, 1981
    Date of Patent: August 16, 1983
    Assignee: Georgia Tech Research Institute
    Inventor: Daniel W. Tedder
  • Patent number: 4396463
    Abstract: A method of purifying waste water, for example waste water from a coking plant, comprises supplying waste water to be purified to the upper part of a stripping column comprising a plurality of substantially horizontal plates disposed above one another, supplying vapor to the lower part of the column, and supplying a strong base to the column laterally at one or more levels, wherein the water to be stripped is passed downwardly from the top of the column across a number of successive plates sufficient to permit the pH of the water to decrease to a value below 7, and wherein the base is supplied at a level or levels lower than that at which the pH has decreased to the above value.
    Type: Grant
    Filed: March 10, 1981
    Date of Patent: August 2, 1983
    Assignee: Centre de Researches Metallurgiques-Centrum Voor Research in de Metallurgies
    Inventors: Christian Josis, Andre Hans, Theophile Martens
  • Patent number: 4395311
    Abstract: Crude aminomethanols are converted to salt form by the addition of a strong acid and subsequently distilled under vacuum. The resulting purified aminomethanol is essentially free of unreacted aldehydes and other volatile impurities.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: July 26, 1983
    Assignee: The Dow Chemical Company
    Inventor: Charles J. McDonald
  • Patent number: 4394221
    Abstract: A method and apparatus for purifying (deodorizing and/or deacidifying) high-boiling, heat-sensitive organic liquids, the method including passing the impure organic liquid in counter-current flow to a carrier vapor of low molecular weight (steam) while the organic liquid is in the form of thin films falling through a multiplicity of parallel, vertically-oriented tubular flow channels, the inside diameters of the flow channels being between 34 and 72 mm, their lengths being between 6 and 16 meters, a heating medium also being present in association with the flow channels, the flow rates and temperatures of the various fluids being controlled to reduce the consumption of carrier vapor and provide a short thermal stress time for the organic liquid.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: July 19, 1983
    Assignee: Firma Wilhelm Schmidding GmbH & Co.
    Inventors: Hermann Stage, Hartmut Hammer, Walter Kuhns
  • Patent number: 4391985
    Abstract: The present invention provides a process whereby by-product isophthalic acid is easily removed from terephthalic acid. The process thus provides a terephthalic acid product of improved purity. The process involves cooling at least a portion of a hot acetic acid production stream from which precipitated terephthalic acid has been removed so as to precipitate at least a portion of the isophthalic acid dissolved therein. The precipitated isophthalic acid is then removed and the production stream is recycled to a reactor from the production of terephthalic acid. The total production stream is thereby rendered unsaturated in isophthalic acid. Following the reaction in the terephthalic acid reactor, pure terephthalic acid in the substantial absence of isophthalic acid is recovered from the production stream as a precipitate. In a preferred embodiment, the cooling step involves cooling about 15 to 75%, and, at times, perhaps up to 100%, of the total hot acetic acid production stream to a temperature below about 50.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: July 5, 1983
    Assignee: Eastman Kodak Company
    Inventors: Richard J. Hook, Mark Rule
  • Patent number: 4390398
    Abstract: Volatile reactants are heated under reflux in a reactor and form volatile reaction by-products which are continuously removed in a vapor effluent from a reflux column and partial condenser. The effluent, which entrains some of the reactants, is condensed in a first total condenser and is fed to a distillation apparatus for separation of the volatile reactants and by-products and return of the separated reactants to the reactor. Before the condensate reaches the distillation apparatus, it is temporarily stored in a receiver from which it is controllably fed to a pre-heater where it is evaporated and then fed as a vapor to the distillation column of the distillation apparatus for separation. The distillation column includes at one end a reboiler which retains the reactants. The other end of the distillation column is coupled to a second total condenser in which the volatile by-products are condensed and withdrawn through a cooler for disposal.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: June 28, 1983
    Assignee: Fiberglas Canada Limited
    Inventors: Robert J. Coker, Gary W. Bate, Henk J. Deuzeman
  • Patent number: 4390396
    Abstract: An apparatus for the distillation of vaporizable liquids, for example alcohol, solvents used for the degreasing of metal and the like, comprises a distillation chamber, a heating unit in the region of the bottom of the distillation chamber, a cooling and condensation unit at an upper portion of the distillation chamber and a cold-generating unit. According to the invention, the cold-generating unit is formed as a heat pump with a circulating refrigerant and has a compressor, a cold branch and a hot branch. The cold branch is connected to the cooling and condensation unit of the distillation chamber while the hot branch transfers heat via a heat exchanger to a heat storage device, e.g. a utility water reservoir from which hot water is drawn to heat the heating unit of the distillation chamber.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: June 28, 1983
    Assignee: Langbein-Pfanhauser Werke AG
    Inventor: Heinz Koblenzer
  • Patent number: 4389285
    Abstract: The present invention provides an improvement in methods for preparing and processing ethylenically unsaturated aromatic monomer. The improvement comprises employing 3,5-dinitrosalicylic acid as a process inhibitor. The DNSA is present in a concentration of about 50 to 3000 ppm, preferably about 250 to 2000 ppm, and most preferably about 500 to 1000 ppm.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: June 21, 1983
    Assignee: Eastman Kodak Company
    Inventors: Ted L. Douglas, Ambrose J. Clonce, Jr., Glenn C. Jones
  • Patent number: 4384924
    Abstract: A method of separating acids or bases from vapors which are conveyed along with distillation vapors during concentration of a solution, comprising, passing said distillation vapors containing an acid or base, while being maintained at their existing pressure and temperature, through a salt solution which boils at said temperature and pressure, wherein, if an acid is to be removed from the distillation vapors, the salt solution contains a salt having an anion corresponding to that of the acid while being supplied with a base in an amount required to neutralize the acid, the cation of the base proportion corresponding to that of the salt, while, if a base is to be removed from the distillation vapors, the salt solution contains a salt having a cation corresponding to that of the base while being supplied with an acid in an amount required to neutralize the base in the distillation vapors, the anion of the acid corresponding to that of the salt so that salts are formed during neutralization which correspond to t
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: May 24, 1983
    Inventor: Matthias Thoma
  • Patent number: 4379736
    Abstract: A method and apparatus for inhibiting polymerization of vinylaromatic compounds during distillative purification wherein downcomers and tray bottoms of the distillation column exposed to high concentrations of liquid monomer condensate and low vapor velocities are coated with a non-wetting fluorocarbon polymer.
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: April 12, 1983
    Assignee: Cosden Technology, Inc.
    Inventors: Debra L. Kendall, James M. Watson, Danny P. Wright
  • Patent number: 4379027
    Abstract: This invention provides a process for obtaining m-methylstyrene from a mixture with p-methylstyrene that comprises hydrogenating a mixture of p-methylstyrene and m-methylstyrene in the presence of a zeolite having a Constraint Index of about 1 to about 12, a silica to alumina mole ratio of at least about 12, and a dried crystal density of not less than about 1.6 grams per cubic centimeter, modified with at least one element of Group IA, IIA, IVB, or VB of the Periodic Chart of the Elements and a metal of Group VIII of the Periodic Chart of the Elements; thereby obtaining a mixture of m-methylstyrene and p-ethyltoluene, and removing p-ethyltoluene by distillation.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: April 5, 1983
    Assignee: Mobil Oil Corporation
    Inventors: John M. Klosek, Margaret M. Wu
  • Patent number: 4379025
    Abstract: A process for removing water from butylene oxides which comprises liquid extraction of crude butylene oxides with a solvent comprising acyclic, paraffinic hydrocarbons having from 7 to 9 carbon atoms per molecule.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: April 5, 1983
    Assignee: Atlantic Richfield Company
    Inventors: Amos Yudovich, Norman H. Sweed
  • Patent number: 4379028
    Abstract: Ethyl acetate cannot be completely removed from ethanol and water mixtures by distillation because of the presence of the minimum ternary azeotrope. Ethyl acetate can be readily removed from mixtures containing it, ethanol and water by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated of nitrogenous organic compound or a mixture of these. Typical examples of effective agents are: dimethylsulfoxide, glycerine and diethylene glycol, 1-naphthol, hydroquinone and N,N-dimethylformamide.
    Type: Grant
    Filed: March 30, 1982
    Date of Patent: April 5, 1983
    Inventors: Lloyd Berg, Pisant Ratanapupech
  • Patent number: 4377441
    Abstract: An alcohol still having a boiler with a valve for maintaining the amount of liquor constant. The boiler mounts a distilling column having a temperature controlled inlet for liquor to be distilled which assists in maintaining the operation at a constant optimum operating temperature.
    Type: Grant
    Filed: August 4, 1982
    Date of Patent: March 22, 1983
    Assignee: Mattel, Inc.
    Inventors: Steven D. Kimmell, Jack P. Murphy, deceased