Class 203/52 - Mixtures of hydrocarbons

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which a mixture of hydrocarbons is added.
No. of patents: 37
Last issue date: 07/07/2009

Number	Title	Issue Date
7556717	Method and device for extractive distillation A process for fractionating a starting mixture of two or more components by extractive distillation using a selective solvent in a dividing wall column aligned in the longitudinal direction of the column and extending to the upper end of the column and dividing the ...	07/07/2009
7550065	Method for recovering solvents A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method includes distilling the solvent from the mixture in the presence of a naphthalene compound. The method of the invention significantly ...	06/23/2009
7365217	Oxidation process A process is disclosed for reacting an olefin, hydrogen, and oxygen in a reactor in the presence of an epoxidation catalyst comprising a transition metal zeolite and a noble metal to produce a product stream comprising an epoxide and an alkane. The alkane is separat...	04/29/2008
7101463	Condensation and recovery of oil from pyrolysis gas A system and process for the recovery of oil from the pyrolysis of material containing hydrocarbons such as shredded vehicle tires. The system utilizes a pair of sequentially positioned packed towers to recover at least 95% of the oil contained in the pyrolysis gase...	09/05/2006
6649205	Solvent extraction There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp...	11/18/2003
6638987	Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and water This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polym...	10/28/2003
6635686	Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and methylbutane This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and 2-methylbutane that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents ...	10/21/2003
6455087	Solvent extraction There is described a process for the extraction of a least one relatively polar component form a material which may be naturally occurring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp...	09/24/2002
6120652	Method for purifying crude 1,1,1,3,3-pentafluoropropane The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by distillation. This method is characterized in that the distillation is ...	09/19/2000
5964987	Neutral oil removal from natural cresylic acid mixtures Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol, preferably triethylene glycol. The light phase solvent is a...	10/12/1999
5906748	Separation of toxic metal ions, hydrophilic hydrocarbons, hydrophobic fuel and halogenated hydrocarbons and recovery of ethanol from a process stream This invention provides a process to tremendously reduce the bulk volume of contaminants obtained from an effluent stream produced subsurface remediation. The chemicals used for the subsurface remediation are reclaimed for recycling to the remediation pro...	05/25/1999
5863391	Purification of a methanol stream Acetaldehyde may be effectively removed from a contaminated methanol stream using a distillation method wherein a solvent stream containing a relatively heavy polar compound such as water or propylene glycol is utilized as an extractive distillation solve...	01/26/1999
5762764	Purification of acetone Close boiling hydrocarbon impurities are separated from acetone by extractive distillation using a C9 -C14 alkane and/or a C8 -C12 aromatic hydrocarbon extractive distillation solvent....	06/09/1998
5670026	In-service cleaning of columns A method of in-service cleaning an operating column by inserting into the column a lance through which a compatible liquid is dispensed at a pressure of at least about 5000 psig. Also disclosed is apparatus which comprises a column through which a fluid c...	09/23/1997
5609735	Process and a device for separating a solid residue from its solution in a stirred bed of material A process and a device are described for separating a solid residue, after separation, from a solution of the residue in evaporable materials and/or solvents with the addition of up to 20% by weight of high-boiling hydrocarbons that are inert under evapor...	03/11/1997
5489366	Recovery of purified and substantially anhydrous propylene oxide A distillation method for the purification of crude propylene oxide containing contaminating quantities of water and methanol by partially purifying the crude propylene oxide in a plural stage distillation zone to provide a vaporized overhead distillate p...	02/06/1996
5429720	Solvent recovery from waste oils A distillation process for separating spent organic solvents such as trichloroethane or d-limonene from their contaminants such as oil is improved by the addition of a perfluorinated alkane or mixture of such alkanes to permit more efficient separation of...	07/04/1995
5288370	Process for the separation of butenes and butanes by extractive distillation For the separation of butenes and butanes by extractive distillation, a charge mainly containing butenes and butanes is contacted in an extractive distillation column under pressure with a first selective polar solvent, S1 (e.g., dimethyl formamide), the ...	02/22/1994
5045156	Distillation of isophthalonitrile with a hydrocarbon liquid High boiling point aromatic free hydrocarbon liquids partially substituted for isophthalonitrile during its distillation fluidize the bottoms and increase isophthalonitrile yield....	09/03/1991
4948470	Extractive distillation of alkane/cycloalkane feed employing mixed solvent A mixture of (a) at least one N-alkyl-2-pyrrolidone (preferably N-methyl-2-pyrrolidone) and (b) at least one sulfolane (preferably unsubstituted sulfolane) is used as solvent in the extractive distillation of feed mixture of cycloalkane(s) (in particular ...	08/14/1990
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
4645568	Preparation of concentrated, stable water-in-oil emulsions of water-soluble or water-swellable polymers Concentrated, stable water-in-oil emulsions of water-soluble or water-swellable polymers are prepared by polymerization of one or more water-soluble ethylenically unsaturated monomers in a water-in-oil emulsion and removal of water from the water-in-oil p...	02/24/1987
4623430	Polymerization inhibitor for vinyl aromatic compounds A process for the distillation of readily polymerizable vinyl aromatic compounds which comprises subjecting said compounds to distillation conditions in the presence of an effective amount of a pretreated polymerization inhibitor selected from the group c...	11/18/1986
4599144	Process for recovery of methacrylic acid Process is disclosed for treating the reaction product of propionic acid and formaldehyde to recover methacrylic acid from an aqueous effluent wherein said effluent contains methacrylic acid, unreacted formaldehyde, unreacted propionic acid, water and by-...	07/08/1986
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
4522689	Process for purifying phosphonitrile chlorides A process for completely separating tri(phosphonitrile chloride) from tetra(phosphonitrile chloride) and/or phosphonitrile chloride oligomer which includes vacuum distillation of the phosphonitrile chloride mixture together with an inert mixture of hydroc...	06/11/1985
4518462	Distillation process for purifying methyl methacrylate In purifying methyl methacrylate by feeding a feed mixture containing methanol, methyl methacrylate and 0.05 to 2% by weight, based on the weight of the methyl Methacrylate, of methyl isobutyrate to a first distillation column, subjecting the same to dist...	05/21/1985
4490153	Process for the production of gasohol Low energy process for the production of gasoline-ethanol blends, comprising dehydrating the aqueous ethanolic product from a conventional fermentation process, preferably containing about 6 wt. % ethanol, so as to generate an aqueous ethanolic effluent c...	12/25/1984
4462928	Partial oxidation of heavy refinery fractions This is a partial oxidation process in which heavy hydrocarbonaceous fractions from a petroleum refinery and light liquid paraffinic hydrocarbon extractants are used in the production of synthesis gas, reducing gas, or fuel gas i.e. gaseous mixtures compr...	07/31/1984
4422903	Anhydrous ethanol distillation method and apparatus An improved distillation method and apparatus are provided for recovering anhydrous ethanol from fermentation or synthetic feedstocks. The system includes at least one stripper-rectifier tower, a dehydrating tower, and an azeotropic agent stripping tower....	12/27/1983
4402797	Separation of chlorosilanes by extractive distillation An improved method for the separation of close-boiling chlorosilanes is described. The method consists of the extractive distillation of the close-boiling chlorosilanes using sulfolane as the extractive solvent and thereafter separating the higher-boiling...	09/06/1983
4292141	Isolation of butadiene from a C₄ -hydrocarbon mixture A process for isolating butadiene, with the aid of a selective solvent, from a C4 -hydrocarbon mixture which contains butadiene and small amounts of styrene and may contain oxygen, hydrocarbons more soluble than butadiene in the selective solve...	09/29/1981
4252737	Process for the production of aromatic carbonic acid esters A process for the production of aromatic carbonic acid esters by transesterifying a mixture of dimethylcarbonamate/methanol and a methanol-immiscible azeotrope former for methanol with phenols in the presence of transesterification catalysts....	02/24/1981
4204916	Process for recovering acid chlorides by distillation A process for recovering an acid chloride from a mixture containing the same, consisting of distilling the acid chloride from the mixture in the presence of an effective quantity of a distillation improvement additive, such as an organo polysiloxane or a ...	05/27/1980
4072580	Process for recovering water-miscible solvents A water-miscible organic solvent is recovered from a mixture containing the solvent and water by adding an inert compound which is immiscible with the water and has a vapor pressure of no more than 5 mm Hg (abs.) at 100° C. to the mixture and thereafter ...	02/07/1978
4053369	Extractive distillation In a process of extractive distillation, the combination of operating with two liquid phases in at least the uppermost trays of the column, preferably while maintaining the column operation at substantially an optimum reflux ratio, results in increased ef...	10/11/1977
4008255	Recovery of phthalic anhydride Process for the recovery of phthalic anhydride in which gases as obtained in the catalytic atmospheric oxidation of o-xylene or naphthalene are treated with a hydrocarbon containing C26.sub.- paraffins, cooling, if necessary, the hydrocarbon la...	02/15/1977

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Class 203/52 - Mixtures of hydrocarbons