PREPARATION METHOD FOR M-PHENYLENEDIAMINE

WIPO Patent Application WO/2022/088300

A1

The present invention relates to the technical field of petrochemical organic synthesis, and in particular, to a preparation method for m-phenylenediamine. m-Phenylenediamine is prepared by using m-phthalodinitrile as a reaction raw material and performing a two-step reaction of catalytic hydrolysis amidation and Hofmann degradation. The key technical problems such as large safety hazards and environmental pollution in the production process due to the fact that dangerous processes of nitration and hydrogenation are involved in the process of producing m-phenylenediamine by means of traditional processes of benzene nitration and hydrogenation are solved. Nitration and hydrogenation reactions are not involved in the process, the reaction temperature is low, the reaction is mild and easy to control, the yield reaches above 80%, and the product purity reaches above 95%.

WO/2019/076658	INCREASING THE CATALYST SELECTIVITY IN THE CONTINUOUS HYDROGENATION OF NITRO COMPOUNDS BY ADDING AMMONIA
JPS532427	PREPARATION OF PHENYLENEDIAMINE

TIAN DA (CN)
ZHANG XIAOQIAN (CN)
MI PENG (CN)
WEI FENG (CN)
CHEN QI (CN)
LU LINLIN (CN)
FENG WEICHUN (CN)
XING WENGUO (CN)

PCT/CN2020/129930

May 05, 2022

November 19, 2020

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SHANDONG XINGQIANG CHEMICAL INDUSTRY TECH RESEARCH INSTITUTE CO LTD (CN)
UNIV QINGDAO SCIENCE & TECHNOLOGY (CN)

C07C211/51; C07C209/56; C07C209/58; C07C209/62

CN111100012A	2020-05-05
CN110437080A	2019-11-12

KATRITZKY, ALAN R. ET AL.: "Efficient Conversion of Nitriles to Amides with Basic Hydrogen Peroxide in Dimethyl Sulfoxide", SYNTHESIS, 31 December 1989 (1989-12-31), pages 949 - 950, XP000103253, DOI: 10.1055/s-1989-27441

JINAN CLAIM PATENT AGENCY OFFICE (GENERAL PARTNERSHIP) (CN)

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