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Class Information
Number: 203/80
Name: Distillation: processes, separatory > Plural distillations performed on same material > One a distillation under positive pressure or vacuum > 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:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8691055 Processes for the purification of trichlorosilane or silicon tetrachloride Apr. 8, 2014
8691056 Method and apparatus for separating fluid mixtures Apr. 8, 2014
8652304 Process for separating solids from valuable or harmful liquids by vaporisation Feb. 18, 2014
8618334 Cyclohexanone production process with modified post-distillation Dec. 31, 2013
8609922 Energy conservation in heavy-hydrocarbon distillation Dec. 17, 2013
8535488 Method and apparatus for purification of trichlorosilane Sep. 17, 2013
8530679 Delta 9--tetrahydrocannabinol processing Sep. 10, 2013
8524047 Method of dehydrating tolylenediamine and dehydrator Sep. 3, 2013
8404085 Separation and purification of hydroquinone from crude mixtures thereof Mar. 26, 2013
8372993 Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification Feb. 12, 2013
8350063 Method for separating tioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification Jan. 8, 2013
8293075 Method for the continuous separation by distillation of mixtures that contain morphonline (MO), monoaminodiglycol (ADG), ammonia and water by means of distillation Oct. 23, 2012
8287698 Process and system for producing alcohol by split-feed distillation Oct. 16, 2012
8282792 Process and system for the purification of trichlorosilane and silicon tetrachloride Oct. 9, 2012
8246793 Method for the continuous separation of mixtures comprising morpholine (MO), monoaminodiglycol (ADG), ammonia and water by means of distillation Aug. 21, 2012
8197645 Process for separating propylene glycol from aqueous compositions Jun. 12, 2012
8197646 Processes for continuous fractional distillation of mixtures comprising morpholine, monoaminodiglycol, ammonia and water Jun. 12, 2012
8192589 Purification of aqueous solutions of organic acids Jun. 5, 2012
8172987 Low-energy extractive distillation process for dehydration of aqueous ethanol May. 8, 2012
8163138 Method for processing effluent from chloromethylation of vinyl aromatic polymers Apr. 24, 2012
8029675 Membrane distillation process and membrane distillation device Oct. 4, 2011
7976818 Method for recovering titanium tetrachloride from a waste liquid Jul. 12, 2011
7931782 Method for recovering a liquid medium and system for recover a liquid medium Apr. 26, 2011
7879198 Processes for the purification of trichlorosilane and silicon tetrachloride Feb. 1, 2011
7846304 Process for purification of 2-chloro-5-chloromethyl-1,3-thiazole Dec. 7, 2010
7828939 Method for concentrating heavy nitrogen isotope Nov. 9, 2010
7781626 Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride Aug. 24, 2010
7718041 Method for obtaining oligomers of polytetrahydofurane or tetrahydrofurane May. 18, 2010
7713387 Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification May. 11, 2010
7695595 Process for the production of a purified hydrofluoroalkane, purified hydrofluoroalkane, use of the hydrofluoroalkane and method for the analysis of a hydrofluoroalkane Apr. 13, 2010
7670464 Method for the distillative separation of a mixture containing vinyl ether and alchol Mar. 2, 2010
7601245 Process for reducing the aldehyde concentration in a mixture comprising cyclohexanone and one or more aldehydes Oct. 13, 2009
7592468 Production of .DELTA. 9 tetrahydrocannabinol Sep. 22, 2009
7575660 Process for the distillative separation of aqueous amine solutions Aug. 18, 2009
7553397 Process Jun. 30, 2009
7524405 Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent Apr. 28, 2009
7481908 System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction Jan. 27, 2009
7468119 Separation of 6-aminocapronitrile and hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine Dec. 23, 2008
7449088 Process for obtaining fatty acids with improved odor, color and heat stability Nov. 11, 2008
7431805 Method and apparatus for simultaneous heat and mass transfer utilizing a carrier-gas at various absolute pressures Oct. 7, 2008
7416644 Method and device for stripping ammonia from liquids Aug. 26, 2008
7416645 Continuous process for recovering acetone from a waste stream resulting from acetone purification Aug. 26, 2008
7384501 Method for improved turpentine recovery from modern cooking plants Jun. 10, 2008
7361795 Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride Apr. 22, 2008
7329330 Method and device for the distillative processing of 1,6-hexanediol, 1,5-pentanediol and caprolactone Feb. 12, 2008
7241928 Process for the manufacture of halocarbons and selected compounds and azeotropes with HF Jul. 10, 2007
7238260 Purification of N-(2-hydroxyethyl)-2-pyrrolidone Jul. 3, 2007
7169267 Method and device for carrying out the distillative separation of C.sub.5+ cuts Jan. 30, 2007
7157610 Process for recovering methanol Jan. 2, 2007
7147757 Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative Dec. 12, 2006

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