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Class Information
Number: 203/98
Name: Distillation: processes, separatory > And returning product of distillation step to distillation zone
Description: Processes directed to returning a product of the distillation operation to the distillation zone.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7597785 |
Low energy vacuum distillation method and apparatus |
Oct. 6, 2009 |
| 7556717 |
Method and device for extractive distillation |
Jul. 7, 2009 |
| 7531066 |
Method for the purification of acrolein |
May. 12, 2009 |
| 7501045 |
Method of producing and separating dinitrile compounds |
Mar. 10, 2009 |
| 7494584 |
Energy efficient method for exothermic reactions |
Feb. 24, 2009 |
| 7476299 |
Vessel for easily polymerizable compound |
Jan. 13, 2009 |
| 7465376 |
Method and device for treating liquids |
Dec. 16, 2008 |
| 7442348 |
Sulfur-bearing residue treatment system |
Oct. 28, 2008 |
| 7438129 |
Water treatment method for heavy oil production using calcium sulfate seed slurry evaporation |
Oct. 21, 2008 |
| 7435319 |
Process for the mild distillative separation of mixtures |
Oct. 14, 2008 |
| 7431806 |
Low energy vacuum distillation method and apparatus |
Oct. 7, 2008 |
| 7428926 |
Water treatment method for heavy oil production |
Sep. 30, 2008 |
| 7393436 |
Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers |
Jul. 1, 2008 |
| 7320745 |
Energy efficient method for exothermic reactions |
Jan. 22, 2008 |
| 7300555 |
Method for the rectifying separation of liquids containing (meth)acrylic monomers in a rectification column |
Nov. 27, 2007 |
| 7291250 |
Vacuum distillation system and use thereof for concentrating organic-aqueous solvent mixtures |
Nov. 6, 2007 |
| 7285187 |
Method of purifying propylene oxide |
Oct. 23, 2007 |
| 7273560 |
Apparatus for condensing and recycling stripper |
Sep. 25, 2007 |
| 7232505 |
Method of regenerating an aqueous glycol solution containing salts |
Jun. 19, 2007 |
| 7226527 |
Method for recovering crude 1,3-butadiene by extractive distillation from a C.sub.4 cut |
Jun. 5, 2007 |
| 7189311 |
Purification of difluoromethane |
Mar. 13, 2007 |
| 7169267 |
Method and device for carrying out the distillative separation of C.sub.5+ cuts |
Jan. 30, 2007 |
| 7150320 |
Water treatment method for heavy oil production |
Dec. 19, 2006 |
| 7132038 |
Method and device for obtaining 1,3 pure butadiene from 1,3 raw butadiene by distillation |
Nov. 7, 2006 |
| 7077201 |
Water treatment method for heavy oil production |
Jul. 18, 2006 |
| 7070694 |
Purification of fluid compounds utilizing a distillation - membrane separation process |
Jul. 4, 2006 |
| 7060865 |
Recovery of C4 olefins from a product stream comprising C4 olefins, dimethyl ether and C5+ hydrocarbons |
Jun. 13, 2006 |
| 7048833 |
Method and apparatus for treating oxygenate-containing feeds and their use in conversion of oxygenates to olefins |
May. 23, 2006 |
| 7014736 |
Apparatus and process for purification of acrylic acid family |
Mar. 21, 2006 |
| 6964730 |
Purification apparatus and method |
Nov. 15, 2005 |
| 6939444 |
Sulfur-bearing residue treatment system |
Sep. 6, 2005 |
| 6936140 |
Water distillation system |
Aug. 30, 2005 |
| 6896772 |
Method for separating ammonia from solutions containing caprolactam and ammonia |
May. 24, 2005 |
| 6852199 |
Method for separating pentenenitrile isomers |
Feb. 8, 2005 |
| 6843890 |
Purification and recovery of acetonitrile from waste solvent acetonitrile |
Jan. 18, 2005 |
| 6758946 |
Recycling hydroxylamine-containing stripper solutions |
Jul. 6, 2004 |
| 6735979 |
Process for pretreating a natural gas containing acid gases |
May. 18, 2004 |
| 6733636 |
Water treatment method for heavy oil production |
May. 11, 2004 |
| 6689251 |
Cycled-concentration distiller |
Feb. 10, 2004 |
| 6676808 |
Method for starting up distilling column |
Jan. 13, 2004 |
| 6660130 |
Apparatus for vaporization of liquids |
Dec. 9, 2003 |
| 6649027 |
Water reclamation system |
Nov. 18, 2003 |
| 6649028 |
Column treating process and apparatus thereof |
Nov. 18, 2003 |
| 6632329 |
Distillation apparatus and distilling method |
Oct. 14, 2003 |
| 6613196 |
Method for stopping purifying column |
Sep. 2, 2003 |
| 6572831 |
Materials treatment |
Jun. 3, 2003 |
| 6558515 |
Dividing wall fractionation column control system and apparatus |
May. 6, 2003 |
| 6551466 |
Multiple effect distillation process with reduced fouling |
Apr. 22, 2003 |
| 6551465 |
Dividing wall column control system |
Apr. 22, 2003 |
| 6547933 |
Process for the purification of aromatic polyamines |
Apr. 15, 2003 |
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