JPS5488222A - Preparation of isocyanate from carbamate - Google Patents

Preparation of isocyanate from carbamate

Info

Publication number
JPS5488222A
JPS5488222A JP15346477A JP15346477A JPS5488222A JP S5488222 A JPS5488222 A JP S5488222A JP 15346477 A JP15346477 A JP 15346477A JP 15346477 A JP15346477 A JP 15346477A JP S5488222 A JPS5488222 A JP S5488222A
Authority
JP
Japan
Prior art keywords
isocyanate
carbamate
raw material
liquid
inert medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15346477A
Other languages
Japanese (ja)
Other versions
JPS6113465B2 (en
Inventor
Natsuki Kano
Tsutomu Takeuchi
Masahiro Sakaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Kasei Corp
Original Assignee
Mitsubishi Kasei Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Kasei Corp filed Critical Mitsubishi Kasei Corp
Priority to JP15346477A priority Critical patent/JPS5488222A/en
Publication of JPS5488222A publication Critical patent/JPS5488222A/en
Publication of JPS6113465B2 publication Critical patent/JPS6113465B2/ja
Granted legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PURPOSE: To obtain an isocyanate useful as a raw material for polyurethane, by decomposing a carbamate thermally under selected reaction conditions using a raw material carrier, such as a dilutive solvent to suppress the formation of high-boiling component as a by-product.
CONSTITUTION: A carbamate, e.g. diethyltoluene -2, 4-dicarbamate, is brought into contact with an inert medium, e.g. a liquid triaryldimethane isomer mixture, in the absence of a catalyst at 255W280°C and decomposed thermally under a pressure of 100 mmHg or below and a residence time within 10 min to give a vapor containing an isocyanate and an alcohol or phenol. The isocyanate is condensed and separated to recover the isocyanate, e.g. liquid tolylene diisocyanate.
EFFECT: Little contamination of the inert medium provides the economical and desirable industrial preparation process.
COPYRIGHT: (C)1979,JPO&Japio
JP15346477A 1977-12-20 1977-12-20 Preparation of isocyanate from carbamate Granted JPS5488222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15346477A JPS5488222A (en) 1977-12-20 1977-12-20 Preparation of isocyanate from carbamate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15346477A JPS5488222A (en) 1977-12-20 1977-12-20 Preparation of isocyanate from carbamate

Publications (2)

Publication Number Publication Date
JPS5488222A true JPS5488222A (en) 1979-07-13
JPS6113465B2 JPS6113465B2 (en) 1986-04-14

Family

ID=15563127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15346477A Granted JPS5488222A (en) 1977-12-20 1977-12-20 Preparation of isocyanate from carbamate

Country Status (1)

Country Link
JP (1) JPS5488222A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4692550A (en) * 1982-04-27 1987-09-08 Bayer Aktiengesellschaft Continuous process for thermal splitting of carbamic acid esters
WO2001064628A1 (en) * 2000-02-29 2001-09-07 Huntsman International Llc Process for the preparation of organic polyisocyanates

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5030832A (en) * 1973-05-04 1975-03-27
JPS5219624A (en) * 1975-08-07 1977-02-15 Mitsui Toatsu Chem Inc Process for preparation of isocyanates

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5030832A (en) * 1973-05-04 1975-03-27
JPS5219624A (en) * 1975-08-07 1977-02-15 Mitsui Toatsu Chem Inc Process for preparation of isocyanates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4692550A (en) * 1982-04-27 1987-09-08 Bayer Aktiengesellschaft Continuous process for thermal splitting of carbamic acid esters
WO2001064628A1 (en) * 2000-02-29 2001-09-07 Huntsman International Llc Process for the preparation of organic polyisocyanates

Also Published As

Publication number Publication date
JPS6113465B2 (en) 1986-04-14

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