Zhejiang Nhu Company Ltd.

Shandong Nhu Amino Acid Co., Ltd.

Zhejiang University

Shandong Nhu Fine Chemical Science and Technology Company Ltd.

Yu Wang

Zhirong Chen

Hong Yin

Haoran Li

Baishan Hu

Jianyong Mao

Qing Liu

Zhixuan Wang

Cong Chen

Jiyu Tang

Weiyong Chen

Guanbing Li

Shuangshuang Zhang

Yingkuo Yang

The present disclosure relates to an additive used in a methionine preparation process, and a methionine preparation method. The additive provided by the present disclosure is a mixture containing components A, B, and C; component A has a structure represented by the following general formula (1); component B has a structure represented by the following general formula (2); component C is silicone oil; RCON(CH)CHCHSONa (1). The methionine preparation method provided in the present invention comprises subjecting methionine to crystallization and/or recrystallization in the presence of the additive provided by the present disclosure. The additive provided by the present disclosure results in uniform emulsification, has good stability, can be used stably for a long time, and is suitable for a continuous crystallization process. The prepared methionine crystal has a good crystal form, a large bulk density, and good flowability. In addition, according to the methionine preparation method of the present disclosure, a crystallization system can operate continuously and stably for a long time without obvious foaming, and the crystallization process of the methionine product can proceed smoothly.

Additive used in methionine preparation process, and methionine preparation method

The present disclosure relates to a method for preparing isophorone diamine by means of a hydrogenation reduction of isophorone nitrile imine. The hydrogenation reduction is continuously carried out in a multi-stage bubble column reactor loaded with a supported alkaline cobalt-based catalyst, wherein isophorone nitrile imine is successively in countercurrent contact with hydrogen in each stage of the reactor to carry out a hydrogenation reduction reaction, so as to obtain the isophorone diamine. The preparation method solves the problem of back-mixing, and further improves the conversion rate and the cis/trans ratio of the product.

Method for preparing isophorone diamine by means of hydrogenation reduction of isophorone nitrile imine

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Zhejiang, China

Yu Wang