Title:
METHOD FOR PREPARING M-PHENYLENEDIAMINE
Document Type and Number:
WIPO Patent Application WO/2022/088303
Kind Code:
A1
Abstract:
A method for preparing m-phenylenediamine. The method comprises: under the protection of nitrogen, by using water as a solvent and using sodium hypochlorite and isophthalimide as reaction raw materials, performing Hofmann degradation reaction and post-treatment to prepare m-phenylenediamine, an antioxidant being added in the post-treatment process to prevent resorcinol from being oxidized. The obtained product is grayish-white and is high in purity, the reaction is mild and easy to control, nitration and hydrogenation reactions are not involved, and the key technical problems of great production safety hidden dangers, environmental pollution, low product quality, and the like in the process of producing m-phenylenediamine by means of nitration and hydrogenation of benzene in conventional processes are solved.
Inventors:
LU LINLIN (CN)
WANG LIQIN (CN)
ZHANG XIAOQIAN (CN)
SHU YONG (CN)
CHEN QI (CN)
MENG XIANXING (CN)
FENG WEICHUN (CN)
XING WENGUO (CN)
WANG LIQIN (CN)
ZHANG XIAOQIAN (CN)
SHU YONG (CN)
CHEN QI (CN)
MENG XIANXING (CN)
FENG WEICHUN (CN)
XING WENGUO (CN)
Application Number:
PCT/CN2020/129934
Publication Date:
May 05, 2022
Filing Date:
November 19, 2020
Export Citation:
Assignee:
SHANDONG XINGQIANG CHEMICAL INDUSTRY TECH RESEARCH INSTITUTE CO LTD (CN)
UNIV QINGDAO SCIENCE & TECHNOLOGY (CN)
UNIV QINGDAO SCIENCE & TECHNOLOGY (CN)
International Classes:
C07C211/51; C07C209/62
Foreign References:
| CN110437080A | 2019-11-12 | |||
| CN111440074A | 2020-07-24 | |||
| CN111100012A | 2020-05-05 | |||
| GB1364229A | 1974-08-21 | |||
| CN112300009A | 2021-02-02 | |||
| CN112279773A | 2021-01-29 |
Attorney, Agent or Firm:
JINAN CLAIM PATENT AGENCY OFFICE (GENERAL PARTNERSHIP) (CN)
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