Synthesis method of 2,4,6-trimethyl-m-phenylenediamine

A technology of trimethyl m-phenylenediamine and trimethyl, applied in the field of synthesis 2, can solve the problems of high production cost, many reaction steps, and high hydrogenation reduction pressure, and achieves reduction in raw material cost, stable product quality, and high reaction steps. less effect
CN105461567AInactive Publication Date: 2016-04-06JIANGSU TIANJIAYI CHEM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU TIANJIAYI CHEM CO LTD
Publication Date
2016-04-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a synthesis method of 2,4,6-trimethyl-m-phenylenediamine. The method is characterized by comprising the steps of: (1) dropwise adding mixed acid into mesitylene for nitration and generation of 2,4,6-trimethyl-m-dinitrobenzene; after the reaction, standing for layering; neutralizing and washing an obtained organic layer to obtain 2,4,6-trimethyl-m-dinitrobenzene; (2) adding the 2,4,6-trimethyl-m-dinitrobenzene the obtained the step (1) to an autoclave, then adding a catalyst and a solvent, replacing the air in the autoclave with nitrogen gas, introducing hydrogen gas and conducting hydrogenation reduction to form 2,4,6-trimethyl-m-phenylenediamine, wherein the hydrogenation temperature is 50-120 DEG C, and the catalyst is a nickel catalyst; discharging hydrogen after the hydrogenation reduction, discharging the materials, removing methanol, cooling, crystallizing, and filtering to obtain the 2,4,6-trimethyl-m-phenylenediamine. The method has the advantages of short synthetic route, high product purity, high yield, few reaction steps, and long usage period of a hydrogenation reduction catalyst.
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Description

technical field

[0001] The invention relates to a method for synthesizing 2,4,6-trimethyl-m-phenylenediamine, which belongs to the technical field of organic synthesis. Background technique

[0002] 2,4,6-Trimethyl-m-phenylenediamine is an intermediate of acidic and reactive dyes, medicine and photosensitive materials. Widely used in dye and pharmaceutical industries.

[0003] In the prior art, the synthetic method of 2,4,6-trimethyl-m-phenylenediamine generally adopts mesitylene as a raw material, and first brominates to generate 2,4,6-trimethylbenzene bromide, Then nitrate with mixed acid to generate 2,4,6-trimethyl m-dinitrobenzene bromide, and finally debromine through hydrogenation reduction under the action of catalyst to generate 2,4,6-trimethyl m-phenylenediamine. There are following problems in adopting this synthetic route: (1) many reaction steps; (2) the hydrogenation reduction pressure is as high as 5-7.5 MPa; (3) the hydrogenation reduction catalyst is easily...

Claims

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