Title:
RECOVERY OF SOLVENT
Document Type and Number:
Japanese Patent JP3916794
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for recovering a solvent, enabling the recycling of the solvent by a distillation treatment using a distillation tower manufactured from a general material such as stainless steel, wherein the solvent contains a chlorinated organic compound having a tertiary chlorinated terminal group which easily generates hydrochloric acid by a reaction such as thermal decomposition or condensation.
SOLUTION: This method for recovering a solvent comprises subjecting the solvent to a chloride-decomposing operation, namely a hydrogen chloride gas-generating operation, and then distilling the treated solvent. The chloride- decomposing operation, namely the hydrogen chloride gas-generating operation, uses a basic organic solvent such as pyridine or methylpyridine or an alkaline aqueous solution such as an aqueous sodium hydroxide solution by a method which comprises allowing to coexist the basic organic solvent or the alkaline aqueous solution, disposing a treating tank or using a distillation can. The method for recovering the solvent enables the control of the generation of hydrogen chloride gas and the use of a general material such as stainless steel, and is a profitable practical method.
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Inventors:
Hideo Kawachi
Masahiro Tsujinaka
Koichiro Ohara
Shun Wachi
Masahiro Tsujinaka
Koichiro Ohara
Shun Wachi
Application Number:
JP7508899A
Publication Date:
May 23, 2007
Filing Date:
March 19, 1999
Export Citation:
Assignee:
Kaneka Corporation
International Classes:
C07B63/02; C07C7/06; C07C7/148; C07C9/15; C07C17/392; C07C22/04; (IPC1-7): C07B63/02; C07C7/06; C07C7/148; C07C9/15; C07C17/392; C07C22/04
Domestic Patent References:
| JP9253602A | ||||
| JP8291090A |
Attorney, Agent or Firm:
Takashima Ichi