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Class Information
Number: 203/93
Name: Distillation: processes, separatory > Vaporization zone under positive pressure or vacuum > Including the addition of water or steam > And returning product of distillation step to distillation zone
Description: Processes directed to returning a product to the distillation zone.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7060787 |
Extraction of impurities from grafted polyolefins |
Jun. 13, 2006 |
| 6982026 |
Azeotropic distillation process for producing organic acids or organic acid amides |
Jan. 3, 2006 |
| 6939444 |
Sulfur-bearing residue treatment system |
Sep. 6, 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 |
| 6521097 |
Process for separating hydrogen chloride from a mixture comprising an N-alkyl-2-pyrrolidone and hydrogen chloride |
Feb. 18, 2003 |
| 6379507 |
Process for producing methylal |
Apr. 30, 2002 |
| 6332949 |
Method for upgrading used sulfuric acids |
Dec. 25, 2001 |
| 6306263 |
Impurities separation by distillation |
Oct. 23, 2001 |
| 6251228 |
Photopolymer washout fluid solvent distillation apparatus and method |
Jun. 26, 2001 |
| 6214172 |
Preparation of methylglyoxal dimethyl acetal |
Apr. 10, 2001 |
| 6120651 |
Method for removing water from an aqueous fluid mixture |
Sep. 19, 2000 |
| 5928477 |
Method and apparatus for removing water from an aqueous fluid mixture |
Jul. 27, 1999 |
| 5902458 |
Method of separating sesamin analogues |
May. 11, 1999 |
| 5837107 |
Process for production of aqueous solutions of free hydroxylamine |
Nov. 17, 1998 |
| 5779861 |
Method for treating process condensate |
Jul. 14, 1998 |
| 5772851 |
Elimination of volatile residues from polyacrylate melts |
Jun. 30, 1998 |
| 5738762 |
Separating oil and water from emulsions containing toxic light ends |
Apr. 14, 1998 |
| 5705040 |
Process for preparing a substantially pure aqueous solution of hydrogen peroxide |
Jan. 6, 1998 |
| 5643420 |
Method for treating process condensate |
Jul. 1, 1997 |
| 5529667 |
Process for recovering ethylene oxide |
Jun. 25, 1996 |
| 5385646 |
Method of treating chemical process effluent |
Jan. 31, 1995 |
| 5264085 |
Method of separating components of phenols mixture by distillation |
Nov. 23, 1993 |
| 5262014 |
Process for removing acetone from a mixture of acetone, methyl, acetate and methyl iodide |
Nov. 16, 1993 |
| 5236558 |
Method to recycle spent ethylene glycol |
Aug. 17, 1993 |
| 5167773 |
Distillation tower and sidestream stripper therefor |
Dec. 1, 1992 |
| 5037511 |
Process for the production of pure dimethylether |
Aug. 6, 1991 |
| 5032231 |
Vacuum distillation process |
Jul. 16, 1991 |
| 4983260 |
Process for concentrating aqueous ethylene oxide solutions |
Jan. 8, 1991 |
| 4978518 |
Continuous vacuum process for recovering vromine |
Dec. 18, 1990 |
| 4966657 |
Process for separating ethylene oxide from aldehyde impurities by distillation |
Oct. 30, 1990 |
| 4725425 |
Continuous vacuum process for recovering bromine |
Feb. 16, 1988 |
| 4719096 |
Continuous two-stage vacuum process for recovering bromine |
Jan. 12, 1988 |
| 4680092 |
Process for degassing, dehydrating and precut separation in straight-run distillation of crude fatty acids |
Jul. 14, 1987 |
| 4666562 |
Solvent recovery from solvent process material mixtures |
May. 19, 1987 |
| 4652343 |
Process for the separation of mixtures of paraffin or respectively paraffins of 6-14 carbon atoms and alcohol or respectively alcohols of 4-8 |
Mar. 24, 1987 |
| 4595461 |
Process for the non-degenerative distillation of fatty acids |
Jun. 17, 1986 |
| 4483747 |
Monomer removal from the slurry of vinyl chloride resin with steam by using improved plate tower |
Nov. 20, 1984 |
| 4434029 |
Process for producing unsaturated nitrile |
Feb. 28, 1984 |
| 4362604 |
Process for the preparation of pyrocatechol and hydroquinone |
Dec. 7, 1982 |
| 4318782 |
Process for distilling ammoniacal solutions |
Mar. 9, 1982 |
| 4302298 |
Process for isolating methyl tert-butyl ether from the reaction products of methanol with a C.sub.4 hydrocarbon cut containing isobutene |
Nov. 24, 1981 |
| 4299667 |
Process for recovering pure benzene |
Nov. 10, 1981 |
| 4278505 |
Process of recovering an n-hexane product which is free from aromatic compounds |
Jul. 14, 1981 |
| 4156633 |
Acrylic acid purification |
May. 29, 1979 |
| 4036865 |
Semicontinuous process for deodorizing oils |
Jul. 19, 1977 |
| 4009230 |
Device for vacuum treatment of liquids by means of a gaseous strip-medium |
Feb. 22, 1977 |
| 3999943 |
Semi-continuous process for alternately producing a sterilizing vapor and regenerating a dilute process solution in a single apparatus |
Dec. 28, 1976 |
| 3998706 |
Process for the separation of chlorohydrocarbons from lower boiling impurities |
Dec. 21, 1976 |
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