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Class Information
Number: 203/77
Name: Distillation: processes, separatory > Plural distillations performed on same material > One a distillation under positive pressure or vacuum > Distillation of initial distillate > Initial distillation under positive pressure or vacuum
Description: Processes in which the initial distillation is carried out under a pressure greater than atmospheric or under a vacuum.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7553397 |
Process |
Jun. 30, 2009 |
| 7501047 |
Method for purifying caprolactam |
Mar. 10, 2009 |
| 7468119 |
Separation of 6-aminocapronitrile and hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine |
Dec. 23, 2008 |
| 7241928 |
Process for the manufacture of halocarbons and selected compounds and azeotropes with HF |
Jul. 10, 2007 |
| 7147757 |
Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative |
Dec. 12, 2006 |
| 7128814 |
Process for separating 2-butanol from tert-butanol/water mixtures |
Oct. 31, 2006 |
| 7128813 |
Process for manufacturing high purity methacrylic acid |
Oct. 31, 2006 |
| 7125474 |
Process for removing 2-butanol from tert-butanol/water mixtures |
Oct. 24, 2006 |
| 7074971 |
Recovery of ethylene and propylene from a methanol to olefin reaction system |
Jul. 11, 2006 |
| 7074434 |
Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions |
Jul. 11, 2006 |
| 6984293 |
Azeotropic distillation of cyclic esters of hydroxy organic acids |
Jan. 10, 2006 |
| 6972075 |
Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine |
Dec. 6, 2005 |
| 6955743 |
Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor |
Oct. 18, 2005 |
| 6936724 |
Process for producing epsilon-caprolactone |
Aug. 30, 2005 |
| 6905576 |
Method and system for producing silane |
Jun. 14, 2005 |
| 6896772 |
Method for separating ammonia from solutions containing caprolactam and ammonia |
May. 24, 2005 |
| 6887352 |
Distillative method for separating hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine |
May. 3, 2005 |
| 6863780 |
Process of separating/purifying pentafluoropropane |
Mar. 8, 2005 |
| 6846389 |
Method for distillative separation of mixtures containing tetrahydrofuran, .gamma.-butyrolactone and/or 1,4-butanediol |
Jan. 25, 2005 |
| 6692616 |
Method for purifying trimethylolpropane, which is produced by hydrogenation, by means of continuous distillation |
Feb. 17, 2004 |
| 6673264 |
Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride |
Jan. 6, 2004 |
| 6632330 |
Process for purification of alkyl alkanoate |
Oct. 14, 2003 |
| 6627046 |
Separation of the products of polyamide ammonolysis |
Sep. 30, 2003 |
| 6599398 |
Recovery of adiponitrile from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine |
Jul. 29, 2003 |
| 6540882 |
Processes for the synthesis of pentafluorobutane and the separation of hydrogen fluoride and pentafluorobutane mixtures |
Apr. 1, 2003 |
| 6508916 |
Process for recovering processing liquids |
Jan. 21, 2003 |
| 6488817 |
Purification of hydrofluorocarbons |
Dec. 3, 2002 |
| 6444096 |
Process for the recovery and purification of cyclobutanone |
Sep. 3, 2002 |
| 6419797 |
Method for producing metal-free Guerbet alcohols |
Jul. 16, 2002 |
| 6375808 |
Process for producing difluoromethane |
Apr. 23, 2002 |
| 6299734 |
Preparation of an aqueous solution of free hydroxylamine |
Oct. 9, 2001 |
| 6235162 |
Ultrapure hydroxylamine compound solutions and process of making same |
May. 22, 2001 |
| 6214172 |
Preparation of methylglyoxal dimethyl acetal |
Apr. 10, 2001 |
| 6156160 |
Alkylene carbonate process |
Dec. 5, 2000 |
| 6106674 |
Operable and efficient distillation schemes for multicomponent separations |
Aug. 22, 2000 |
| 6048441 |
Isolation of neopentyl glycol hydroxypivalate (NGH) |
Apr. 11, 2000 |
| 6024840 |
Propylene oxide purification |
Feb. 15, 2000 |
| 5993608 |
Process for recovering processing liquids |
Nov. 30, 1999 |
| 5985100 |
Process for separating butanol and dibutyl ether by means of dual-pressure distillation |
Nov. 16, 1999 |
| 5948213 |
Processes for the manufacture and purification of 1,1,2,2,3,3,4,4-octafluorobutane and by-products, and azeotropes with HF |
Sep. 7, 1999 |
| 5935388 |
Distillation plant with a heat pump |
Aug. 10, 1999 |
| 5783047 |
Heat integrated distillation column |
Jul. 21, 1998 |
| 5779861 |
Method for treating process condensate |
Jul. 14, 1998 |
| 5766424 |
Process for removing trioxane from an aqueous mixture |
Jun. 16, 1998 |
| 5753190 |
Vacuum system for controlling pressure in a polyester process |
May. 19, 1998 |
| 5707497 |
Process for the separation of hydrogen fluoride and of difluoromethane |
Jan. 13, 1998 |
| 5705039 |
Process for purifying a 2,6-dialkylphenol |
Jan. 6, 1998 |
| 5685957 |
Method for removing acidic and salt impurities from an aqueous condensed phase containing dimethylcarbonate |
Nov. 11, 1997 |
| 5683553 |
Preparation of 3-chlorophthalic anhydride |
Nov. 4, 1997 |
| 5679223 |
Method for separating and purifying catechol mixtures |
Oct. 21, 1997 |
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