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| Number | Title | Issue Date |
| 6623604 | Method of recovering free fatty acids having low ester content and high acid value Methods of recovering free fatty acids having a low ester content from alkanol-containing solutions and oil mixtures containing tocopherols are disclosed which involve atmospheric or vacuum stripping at low temperatures. The recovered fatty acids have a h... | 09/23/2003 |
| 5759357 | Process for the recovery of a strong acid from an aqueous solution A process for the recovery of an acid in its anhydrous form from an aqueous solution containing the acid in its hydrated form. Adding to the solution a weak base in the form of a soluble salt of the acid and concentrating the solution containing the acid ... | 06/02/1998 |
| 5718810 | Methanol recovery using extractive distillation A method for recovering methanol from sulfur-based wood pulping process vapors, which contain at least methanol and dimethyl disulfide. The method involves three steps. The first step consists of introducing the vapors into a first distillation tower at a... | 02/17/1998 |
| 5662780 | Process for purifying acetic acid A process for purifying acetic acid which comprises: introducing a feedstock aqueous solution of acetic acid having an acetic acid concentration of from 10 to 50% by weight into an extractor; supplying an extracting medium containing isopropyl acetate in ... | 09/02/1997 |
| 5616217 | Controlled alkali treatment in the recovery of methyl tertiary butyl ether In the manufacture of MTBE from TBA and methanol, acidic by-products formed during the etherification reaction are removed by fractionating the etherification reaction product in a first MTBE distillation column to provide a first lower boiling distillati... | 04/01/1997 |
| 5603812 | Process for the recovery of a strong acid from an aqueous solution A process for the recovery of an acid in its anhydrous form from an aqueous solution containing the acid in its hydrated form. The process includes adding to the solution a weak base in the form of a soluble salt of the acid, and concentrating the solutio... | 02/18/1997 |
| 5500098 | Process for regeneration of volatile acids Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while ... | 03/19/1996 |
| 5500097 | Method for removing organic compound in water The present invention provides a method for removing an organic compound in water at a high efficiency by separating an organic compound, particularly such an organic chlorine compound as 1,2-dichloroethane, carbon tetrachloride and chloroform dissolved i... | 03/19/1996 |
| 5275702 | Distillation method of separating organic solvents The present invention discloses a method to separate each component from a mixed solution of organic solvents obtained during the production of -L-aspartyl-L-phenylalanine methyl ester, which is useful as a sweetener, namely, a mixed solution of ac... | 01/04/1994 |
| 5264117 | Distillation of hydrocarbons Where side stream distillate strippers are used in the distillation of hydrocarbons, the required size of the distillation column and the amount of stripping gas or vapor required are reduced by passing components stripped from the distillates through a p... | 11/23/1993 |
| 5240566 | Separation process A process for separating acetone, dichloromethane and trifluoroacetic acid from a mixture of acetone, dichloromethane, and a trifluoroacetic acid/acetone azeotrope by (1) fractionally distilling the mixture of acetone, dichloromethane, and the trifluoroac... | 08/31/1993 |
| 5004829 | Method of preparing trifluoromethanesulfonic acid anhydride (CF3 SO2)2 O is formed by reaction of CF3 SO3 H with P2 O5 and taken out of the reaction system by distillation, but the residue of the distillation contains a considerable amount of ... | 04/02/1991 |
| 4935104 | Process for the continuous hydro-distillation of plants The invention provides a process for producing essential oils by plant hydro-distillation including the following steps: (a) loading the plants continuously into a still where they are processed counterflow wise with steam, (b) continuous unloading of the exha... | 06/19/1990 |
| 4902385 | Process for the purifying distillation of crude sec-butyl alcohol Practically anhydrous crude sec-butyl alcohol produced by catalytic direct hydration of n-butenes is freed by means of water from the azeotropically boiling and low-boiling by-products by continuous azeotropic distillation in a separation column, the prep... | 02/20/1990 |
| 4892624 | Workup of distillation residues from the purification of caprolactam Distillation residues from the purification of caprolactam are worked up by heating in the presence of sodium hydroxide or potassium hydroxide and in the presence of a high-boiling hydrocarbon at from 250° to 500° C. and continuously removing the caprol... | 01/09/1990 |
| 4863607 | Method for removing amine from oil The present invention is a method for using water to remove amine from an oil-amine component. The oil-amine component is typically produced in prior art processes using an amine having an inverse critical solution temperature with water to break emulsion... | 09/05/1989 |
| 4851086 | Production of high purity phenol by steam distillation Crude phenol, containing AMS by-product, and MBF impurity, is distilled in the presence of water to separate MBF impurity.... | 07/25/1989 |
| 4744869 | Process for purifying methanol A process for purifying methanol which comprises introducing crude synthetic methanol obtained by catalytic reaction of carbon oxide and hydrogen into a rectifying column either as such or after it is first introduced into a topping column and distilled w... | 05/17/1988 |
| 4532012 | Production of high purity phenol by distillation with steam and a solvent Phenol containing MBF impurity is distilled in the presence of water and an extraction solvent for MBF (preferably AMS and/or cumene) to recover a phenol bottoms having reduced impurities. The use of solvent permits a reduction in the amount of water used... | 07/30/1985 |
| 4522920 | Production of ethanol A flow of fermenting liquor from a fermentor is separated into a yeast concentrate flow, which is recirculated to the fermentor, and a yeast-free flow which is separated in a simple evaporator unit into a first ethanol-enriched vapor flow and a first liqu... | 06/11/1985 |
| 4511437 | Process for the continuous rectification of alcoholic fermates A process for continuous rectification of a liquid mixture containing alcohols, particularly a liquid fermate, employs a plurality of distillation columns to which the liquid mixture is fed in parallel, and which have successively reduced operating pressu... | 04/16/1985 |
| 4508597 | Recovery of organic solvents from liquid mixtures A method of recovering light organic solvent from a liquid mixture containing the solvent and a product material, such as asphaltenes or coal liquefaction products. The solvent-product material mixture is treated to separate a first vapor phase rich in so... | 04/02/1985 |
| 4434029 | Process for producing unsaturated nitrile A process for producing an unsaturated nitrile with saved energy by which the bottom stream from a recovery column is used as the heat source for at least one distillation column in the process and thereafter used to pre-heat a recovery column feed withdr... | 02/28/1984 |
| 4420376 | Separation of resorcinol from non-extractable impurities An improved process for recovering high purity resorcinol produced by the rearrangement of m-diisopropylbenzene dihydroperoxide in which the rearranged product mixture is neutralized, the neutralized mixture being filtered, the filtrate being admixed with... | 12/13/1983 |
| 4404064 | Water extractive distillation of olefinically unsaturated nitriles The invention provides a process for the recovery and purification of acrylonitrile from acetonitrile and relatively heavy impurities mixture by water extractive distillation and solvent stripping wherein the mixture is fed to approximately the middle of ... | 09/13/1983 |
| 4401517 | Vapor-liquid extractive distillation with dialkyl sulfone/water combination 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 arom... | 08/30/1983 |
| 4359365 | Method of purification of ଲ-phenylethyl alcohol A method of purification of crude ଲ-phenylethyl alcohol to give a highly pure ଲ-phenylethyl alcohol suitable as a perfume, which comprises subjecting the crude ଲ-phenylethyl alcohol to azeotropic distillation in the presence of an azeotr... | 11/16/1982 |
| 4358536 | Production of ethanol A flow of fermenting liquor from a fermentor is separated into a yeast concentrate flow, which is recirculated to the fermentor, and a yeast-free flow which is separated in a simple evaporator unit into a first ethanol-enriched vapor flow and a first liqu... | 11/09/1982 |
| 4334965 | Process for recovery of olefinic nitriles A multi-stage evaporator is used to remove water from the extracted distillation or stripper tower bottoms recycled as quench liquid to the quench tower of an acrylonitrile purification and recovery system. This results in a significant decrease in the am... | 06/15/1982 |
| 4334964 | Process for separating the reaction products obtained from etherifying lower isoolefins with methanol A method for separating a mixture of reaction products produced in the catalytic etherification of a lower isoolefin with methanol wherein said reaction product comprises a mixture of ether, methanol, unreacted hydrocarbon and tertiary alcohol which compr... | 06/15/1982 |
| 4323432 | Process for isolating and recovering meta- and para-cresols from crude cresol-containing compositions composed of cresol components, unreacted cymene components and high-boiling by-products A improvement in the process for isolating and recovering meta- and para-cresols from crude cresol-containing compositions composed of cresol components, unreacted cymene components and high-boiling by-products, by distillation in a distillation zone, the... | 04/06/1982 |
| 4306945 | Extracting aromatic hydrocarbons from mixtures containing same A method for the removal of aromatic hydrocarbon from mixtures containing non-aromatic hydrocarbon by liquid-liquid extraction and extractive distillation is described. Isoenthalpic expansion of the rectification column bottom solvent stream and addition ... | 12/22/1981 |
| 4302298 | Process for isolating methyl tert-butyl ether from the reaction products of methanol with a C4 hydrocarbon cut containing isobutene Process for isolating methyl tert-butyl ether contained in the reaction product of methanol with a C4 hydrocarbon cut containing isobutene, comprising fractionating said reaction product by introducing it at an intermediate point of a distillat... | 11/24/1981 |
| 4285778 | Process for the manufacture of halogenated hydrocarbons 2,2-Dichloro-5-methyl-1,1,1-trifluorohex-4-ene, an intermediate in the synthesis of pyrethroid insecticides, is obtained by continuous distillation, preferably under sub-atmospheric pressure, of a mixture of 5-methyl-2,2,4-trichloro-1,1,1-trifluorohexane,... | 08/25/1981 |
| 4272960 | Process and system for recovery of working fluid for direct contact heat exchange In the recovery of energy from geothermal brines and other water containing or hot water sources, such brine or hot water under pressure is introduced into direct heat exchange contact with a working fluid such as isobutane, the resulting hot isobutane is... | 06/16/1981 |
| 4233120 | Distillation method for solvent recovery An improved solvent recovery process comprising distilling soiled solvent in a main still and conducting hot solvent vapor through a heat exchanger associated with a tank in which an azeotropic mixture of water and soiled solvent is maintained, which mixt... | 11/11/1980 |
| 4168209 | Process for purifying benzene and toluene by extractive azeotropic distillation Process for separating benzene and/or toluene from mixtures thereof with saturated hydrocarbons, by extractive distillation using an aliphatic N-alkylamide as extraction solvent, comprising introducing in the distillation column, above the level of introd... | 09/18/1979 |
| 4166008 | Process for recovery of olefinic nitriles In the recovery and purification of acrylonitrile or methacrylonitrile obtained by the ammoxidation reaction of propylene or isobutylene, the bottoms stream associated with the column for extractively distilling acrylonitrile or methacrylonitrile is both ... | 08/28/1979 |
| 4149940 | Methanol A methanol production process including synthesis gas generation, methanol synthesis and methanol distillation includes an autonomous system in which low pressure steam is raised by heat exchange with a fluid stream at 120°-300° C. in the process, the l... | 04/17/1979 |
| 4111759 | Process for separating ammonia and acid gases from waste waters containing fixed ammonia salts A water purification process is described for the removal of ammonia and optionally one or more acid gases from waste waters such as coke-plant or coal conversion waste waters. The process involves adding lime to these waste waters in amounts sufficient t... | 09/05/1978 |
