PREPARATION METHOD FOR 1,5-PENTANE DIISOCYANATE

Title:

PREPARATION METHOD FOR 1,5-PENTANE DIISOCYANATE

Document Type and Number:

WIPO Patent Application WO/2022/041502

Kind Code:

A1

Abstract:

Disclosed herein is a method for preparing 1,5-pentane diisocyanate, comprising the following steps: (1) mixing 1,5-pentanediamine, a carbonylation agent, a first solvent and a catalyst for a carbonylation reaction, performing solid-liquid separation, and obtaining a 1,5-pentamethylene dicarbamate reaction solution; and (2) purifying the 1,5-pentamethylene dicarbamate reaction solution, then mixing same with a second solvent for a pyrolysis reaction, and obtaining 1,5-pentane diisocyanate.

Inventors:

WANG LIGUO (CN)
XU SHUANG (CN)
LI HUIQUAN (CN)
HE PENG (CN)
CAO YAN (CN)
CHEN JIAQIANG (CN)
ZHENG ZHENG (CN)
WANG XUE (CN)
ZHAO XUEFENG (CN)

Application Number:

PCT/CN2020/129047

Publication Date:

March 03, 2022

Filing Date:

November 16, 2020

Export Citation:

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Assignee:

INST PROCESS ENG CAS (CN)

International Classes:

C07C265/14; C07C263/04; C07C269/04; C07C271/20

Domestic Patent References:

WO2008015134A1

2008-02-07

Foreign References:

CN108689884A	2018-10-23
CN102782146A	2012-11-14
JP2011201863A	2011-10-13
CN101495643A	2009-07-29
DE2625075A1	1977-12-22
DE1900514A1	1970-08-20
EP15071438A
CN108689884A	2018-10-23

Other References:

WANG ZHENXING, YU JING-WEN, JIN SHAN, YU TING-YUN, JIN SHEN: "Study on Preparation of Hexamethylene Diisocyanate by Thermal Decomposition of Dimethyl-hexane-1,6-dicarbamate", PETROCHEMICAL TECHNOLOGY & APPLICATION, XX, CN, vol. 30, no. 1, 31 January 2012 (2012-01-31), CN , pages 31 - 35, XP055903880, ISSN: 1009-0045
T. LESIAKK. SEYDA, JOURNAL FUR PRAKTISCHE CHEMIE (LEIPZIG), vol. 321, no. 1, 1979, pages 161 - 163
W. SIEFKEN, JUSTUS LIEBIGS ANN. CHEM., vol. 562, 1949, pages 25