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Title:
DEVICE FOR PRODUCING POLYISOCYANATE
Document Type and Number:
Japanese Patent JP2006282642
Kind Code:
A
Abstract:

To provide a device for producing a polyisocyanate while capable of producing chlorine stably from a by-product, hydrogen chloride, capable of reacting carbonyl chloride with a polyamine stably, and also treating the by-product, hydrogen chloride efficiently.

This device for producing the polyisocyanate is provided with that a hydrogen chloride gas-controlling part 32 controls a flow-controlling valve 23 to make the feeding amount of the hydrogen chloride fed to a hydrogen chloride-oxidizing vessel 6 from a hydrogen chloride-purifying column 4 through a second hydrogen chloride gas-connecting line 11 as a constant, also the hydrogen chloride gas-controlling part 32 controls a pressure-controlling valve 22 based on the pressure at the inside of the hydrogen chloride-purifying column 4, input from a pressure sensor 25, to discharge the hydrogen chloride gas to a hydrogen chloride-absorbing column 5 from the hydrogen chloride-purifying column 4 through a first hydrogen chloride gas-connecting line 10 so as to make the pressure in the hydrogen chloride-purifying column 4 as a constant.


Inventors:
SASAKI SUKEAKI
MAEBA KOJI
TAKAHASHI HIRONORI
NAITO TAKAO
Application Number:
JP2005108593A
Publication Date:
October 19, 2006
Filing Date:
April 05, 2005
Export Citation:
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Assignee:
MITSUI CHEMICALS POLYURETHANES
International Classes:
C07C263/10; C01B7/01; C07C265/14
Domestic Patent References:
JP2001516333A2001-09-25
Foreign References:
WO2004014845A12004-02-19
WO2004037718A22004-05-06
WO2004056758A12004-07-08
Attorney, Agent or Firm:
Hiroyuki Okamoto