Class 203/58 - Heterocyclic

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which the organic compound is heterocyclic.
No. of patents: 225
Last issue date: 01/29/2008

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Number	Title	Issue Date
7323579	Separation of propylene oxide from a mixture comprising propylene oxide and methanol A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said mixture (M) into an extractive dist...	01/29/2008
7306705	Method for dehydrating composition comprising lithium bis(pentafluoroethanesulfonyl)imide A method for dehydrating an aqueous composition comprising lithium bis(pentafluoroethanesulfonyl)imide and at least one organic solvent, wherein a part of solvent is distilled off by distillation. ...	12/11/2007
7235183	Glycerine foots salt separation system The present invention provides a method and apparatus for the recovery of salt from a glycerine process, allowing the salt to be used in a brine solution. A salt settling tank is positioned inline between the foots from a crude still bottom and a foot still. Salt se...	06/26/2007
7128814	Process for separating 2-butanol from tert-butanol/water mixtures The present invention relates to a process for separating 2-butanol from tert-butanol/water by adding of tert-butanol such that the water concentration lowers to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/wa...	10/31/2006
7125474	Process for removing 2-butanol from tert-butanol/water mixtures The invention relates to a process for separating 2-butanol from an industrial mixture which includes 2-butanol, tert-butanol and water by separating water from the industrial mixture by distillation to obtain a distillate, wherein the distillate has, in terms of th...	10/24/2006
6802959	Separation of olefinic hydrocarbons from sulfur-containing hydrocarbons by use of a solvent A process for separating olefins from sulfur-containing hydrocarbons contained in a hydrocarbon feedstock is disclosed and includes contacting the hydrocarbon feedstock with N-hydroxyethyl pyrollidone in a contacting zone, removing at least one olefin overhead from ...	10/12/2004
6582565	Recovery of 3,4-epoxy-1-butene by extractive distillation Disclosed is a process for the recovery and purification of 3,4-epoxy-1-butene (epoxybutene) from mixtures comprising epoxybutene and aliphatic and aromatic hydrocarbons containing five to seven carbon atoms having boiling points between about 20° C. and...	06/24/2003
6395141	Separation of components from aromatic hydrocarbon mixtures thereof by extractive distillation A method of separating aromatic hydrocarbons and non-aromatic hydrocarbons, and aromatic hydrocarbons and naphtenes involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent...	05/28/2002
6375807	Separation of ethanol mixtures by extractive distillation A method of separating ethanol and ethyl acetate, and ethanol and water involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent. The extractive distillation solvent may be...	04/23/2002
6315869	Process for purification of perfluorovinyl ethers A perfluorovinyl ether of the formula: RfO(CF2 CFXO)n CF.dbd.CF2 (1) in which Rf is a perfluoralkyl group, X is a fluorine atom or a trifluoromethyl group, and n is a number of 0 to 20 containing impurities is purified by remo...	11/13/2001
6136155	Separation of mesitylene from 1,2,4-trimetyhlbenzene by azeotropic distillation Mesitylene is difficult to separate from 1,2,4-Trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are isopropyl acetate, 2-pentanol and acetonitrile....	10/24/2000
6059933	Inhibition of 141b decomposition Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as butylene oxide and/or the use of a vessel made of a nickel alloy....	05/09/2000
6039846	Separation of 3-methyl-2-pentenal from n-butanol by azeotropic distillation 3-Methyl-2-pentenal cannot be separated from 1-butanol by conventional rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by azeotropic distillation. Effective agents are dimethoxyme...	03/21/2000
6024841	Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by extractive distillation 2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1 pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-butanol and 3-methyl-1-butanol can be easily separated from 1-pe...	02/15/2000
6017423	Separation of 3-methyl-2-pentenal from N-butanol by extractive distillation 3-Methyl-2-pentenal cannot be separated from n-butanol by conventioal rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by extractive distillation. Effective agents are 1-methyl-2-p...	01/25/2000
6007707	Process for the recovery of pure hydrocarbons from a hydrocarbon mixture Process for the recovery of pure hydrocarbons from a hydrocarbon mixture, more particularly, a high aromatics content hydrocarbon mixture, by extractive distillation in an extractive distillation column. A first solvent feed for a first sub-flow of a sele...	12/28/1999
6004435	Separation of cumene from 3-ethyl toluene by azeotropic distillation Cumene cannot be separated from 3-ethyl toulene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are methyl salicylate, diethylene glycol butyl ether and 3-nitrotolue...	12/21/1999
5972173	Allyl alcohol purification Mixtures of allyl alcohol and n-propanol are separated by extractive distillation using propylene carbonate, N-methyl pyrrolidone or gamma-butyrolactone extractive distillation solvent....	10/26/1999
5972172	Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation 1,2,4-Trimethylbenzene is difficult to separate from 1,2,3-trimethylbenzene by conventional distillation or rectification because of the proximity of their boiling points. 1,2,4-trimethylbenzene can be readily separated from 1,2,3-trimethylbenzene by extr...	10/26/1999
5961789	Separation of t-amyl alcohol from n-butanol by extractive distillation T-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. T-Amyl alcohol is readily separated from n-butanol by extractive distillation. Effective agents are dimethylsulfoxide, N.N...	10/05/1999
5951829	Separation of heteropoly compounds from polyethers, polyesters and polyether esters A method of separating heteropoly compounds from mixtures of polyethers, polyesters and/or polyether esters, a protic component and heteropoly compounds, wherein the protic component is removed from the mixture and subsequently separating off the heteropo...	09/14/1999
5904815	Separation of t-amyl alcohol from n-butanol by azeotropic distillation t-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. t-Amyl alcohol is readily separated from n-butanol by azeotropic distillation. Effective agents are propyl acetate, tetrah...	05/18/1999
5897750	Separation of acetone from isopropanol-water mixtures by extractive distillation Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive distillation. Effective extractive agents are 1-nitropropane, 3-...	04/27/1999
5879517	Method for separating 2-butanol from t-amyl alcohol using certain organic compounds as the agent in extractive distillation 2-Butanol cannot be sparated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are butyl ether, benzyl ace...	03/09/1999
5876569	Separation of methyl ethyl ketone from ethanol by extractive distillation Methyl ethyl ketone cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Methyl ethyl ketone is readily separated from ethanol by extractive distillation. Effective agents are methyl benzoate,...	03/02/1999
5865958	Method for separating cyclohexene Cyclohexene is separated from a mixture of cyclohexene and at least one of cyclohexane and benzene by subjecting the mixture to extractive distillation in the presence of an extraction solvent the formula: ##STR1## wherein R1 and R2	02/02/1999
5851362	Separation of 4-methyl-2-pentanol from 3-methyl-1-butanol by extractive distillation 4-Methyl-2-pentanol cannot be separated from 3-methyl-1-butanol by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanol can be easily separated from 3-methyl-1-butanol by extractive distillation. Effective agents are dodecane...	12/22/1998
5849982	Recovery of styrene from pyrolysis gasoline by extractive distillation An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic or non-aromatic hydrocarbon, employing a two part extractiv...	12/15/1998
5800681	Separation of ethanol, isopropanol and water mixtures by extractive distillation Ethanol, isopropanol and water cannot be separated from each other by distillation or rectification because of minimum azeotropes. They are readily separated by extractive distillation. Effective agents are: dimethylsulfoxide for ethanol, phenol for isopr...	09/01/1998
5795447	Separation of 2-butanol from isobutanol by extractive distillation 2-Butanol cannot be separated from isobutanol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from isobutanol by extractive distillation. Effective agents are propylene glycol propyl ether,...	08/18/1998
5779862	Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by azeotropic distillation 2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-butanol and 3-methyl-1-butanol can be easily separated from 1-pe...	07/14/1998
5776321	Separation of t-amyl alcohol from 1-propanol by azeotropic distillation 1-Propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by azeotropic distillation. Effective agents are heptane, ethyl aceta...	07/07/1998
5772853	Separation of 1-propanol from t-amyl alcohol by extractive distillation 1-Propanol and t-amyl alcohol cannot be separated by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are dipentene, amyl aceta...	06/30/1998
5738763	Separation of 2-methyl-1-propanol from 2-methyl-1-butanol by extractive distillation 2-Methyl-1-propanol is difficult to separate from 2-methyl-1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily separated from 2-methyl-1-butanol by extractive distill...	04/14/1998
5723024	Separation of 2-methyl-1-propanol from 1-butanol by extractive distillation 2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily separated from 1-butanol by extractive distillation. Effective a...	03/03/1998
5723025	Separation of 2-methyl-1-propanol from 2-butanol by extractive distillation 2-Methyl-1-propanol is difficult to separate from 2-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily separated from 2-butanol by extractive distillation. Effective a...	03/03/1998
5723026	Process for recovering pure benzene and pure toluene from aromatic hydrocarbon products The production of high purity benzene and high purity toluene is obtained by utilizing the initial gas separating column for the treatment of the aromatic containing starting material as a separating column for separating a benzene rich from a toluene ric...	03/03/1998
5720857	Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by azeotropic distillation 1,2,4-Trimethylbenzene is difficult to sepparate from 1,2,3-trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are 1-propanol, methyl formate and 1-nitropropane....	02/24/1998
5718809	Separation of t-amyl alcohol from 2-methyl-1-propanol by extractive distillation T-Amyl alcohol and 2-methyl-1-propanol are difficult to separate by conventional distillation or rectification because of the proximity of their boiling points. T-Amyl alcohol can be easily separated from 2-methyl-1-propanol by extractive distillation. Ef...	02/17/1998
5716499	Separation of 2-methyl-1-propanol from 1-butanol by azeotropic distillation 2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be easily separated from 1-butanol by azeotropic distillation. Effective ag...	02/10/1998

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Class 203/58 - Heterocyclic