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EP0131932A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for distillation of 1,2-dichloroethane

Assignee: Tosoh Corp
•
Filing: 1984-07-13
•
Granted: —
•
Expires: 2004-07-13
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Abstract

Abstract A method for distillation of 1.2-dichloroethane containing high-boiling substances in a high-boiling column is disclosed, which comprises distilling the 1,2-dichloroethane in said high-boiling column at an overhead pressure higherthan one atmosphere (absolute), introducing the 1,2-dichloroethane gas recovered from the top of said column into a compressor, increasing the pressure and temperature of said gas to levels higher than the overhead pressure and temperature by from 0.5 kg/cm' or more and from 7°C or more, respectively, and recovering heat from said gas. The method includes a heat recovery step for making effective use of the thermal energy of a 1,2-dichloroethane gas being recovered from the top of the high-boiling column in which 1,2-dichloroethane containing high-boiling substances is distilled.

Inventors

  • 👤 Hiroshi Yamato
  • 👤 Koichi Kawasaki
  • 👤 Isao Takahashi
  • 👤 Haruyuki Harada

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 00:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/383; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/50

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 81 words
.1. A method for distillation of 1,2-dichloroethane containing high-boiling substances in a high-boiling column, comprising distilling the 1,2-dichloroethane in said high-boiling column at an overhead pressure higher than one atmosphere (absolute), introducing the 1,2-dichloroethane gas recovered from the top of said column into a compressor, increasing the pressure and temperature of said gas to levels higher than the overhead pressure and temperature by from 0.5 kg/cm 2 or more and from 7°C or more, respectively, and recovering heat from said gas.
Claim 2
Dependent Claim 65 words
A method for distillation of 1,2-dichloroethane as in Claim 1, wherein said high-boiling column is operated at an overhead pressure of at least 0.5 kg/cm 2 G, and the heat recovered is used as a heat source for reboilers associated with at least two columns selected from the high-boiling column, a low-boiling column, a dehydrator column, a 1,2-dichloroethane recovery column, and a vinyl chloride column.
Claim 3
Dependent Claim 24 words
A method according to Claim 1, wherein the overhead pressure of the high-boiling column is in the range of from 0.5 to 1.5 kg/cm2G.
Claim 4
Dependent Claim 27 words
A method according to Claim 2, wherein the overhead pressure of the high boiling column is in the range of from 0.5 to 1.5 kg/cm 2 G.
Claim 5
Dependent Claim 32 words
A method according to Claim 1, wherein the pressure of 1,2-dichloroethane gas introduced into the compressor is elevated to a value from 0.5 to 2.0 kg/cm 2 higher than the overhead pressure.
Claim 6
Dependent Claim 32 words
A method according to Claim 2, wherein the pressure of 1,2-dichloroethane gas introduced into the compressor is elevated to a value from 0.5 to 2.0 kg/cm 2 higher than the overhead pressure.

References Cited (Backward Citations)

DE3112011A1 Cited

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