Nio Nextev Limited

Cibt America Inc.

Cathay Biotech Inc.

Cathay R&d Center Co., Ltd

Cathay Industrial Biotech Ltd.

Yi Zheng

Bingbing Qin

Naiqiang Li

Kris Tomasson

Xiucai Liu

Chao Yang

Chen Yang

Tao Wei

Charlie Liu

Chi Liu

Hao Zhu

Xu He

Zhiling Zhao

Patrick Niall McGoldrick

Changcheng Yang

Younes Badi

Robert James Orriv

Xiwei Yang

Andrea Carlon

Stephen White

Charging vehicle

The present invention provides a method for preparing nylon salt, which comprises mixing 1,5-pentanediamine, water and dicarboxylic acid at a temperature of 65 to 120&#xb0; C. to obtain a nylon salt, wherein the amount of the water is 2% to 12% by weight based on the total weight of the 1,5-pentanediamine and the dicarboxylic acid. The present invention also provides a nylon salt. According to the present method for preparing nylon salt, the incomplete reaction between the 1,5-pentanediamine and the dicarboxylic acid, which is caused by the nylon salt present during the preparation in a solid state, can be avoided; the reaction between the 1,5-pentanediamine and the dicarboxylic acid can be significantly speeded up, and the reaction time is accordingly shorten. Consequently, the content of diamine and dicarboxylic acid remained in the resulting nylon salt is very low. In addition, the final nylon salt product, which present in a solid state, makes it easier to be stored and transported.

Nylon salt and preparation method therefor

Disclosed is a process for treating a reaction solution containing a long chain dicarboxylate. The process is characterized by comprising: acidifying a reaction solution so as to convert the long chain dicarboxylate into a long chain dicarboxylic acid, adding an extractant so as to extract the resulting long chain dicarboxylic acid, separating the phase rich in the long chain dicarboxylic acid, and further separating the long chain dicarboxylic acid. The process of the present invention has the following advantages: 1) the processing route is simple, the operation time is short, less equipment is required, and the production efficiency is high; 2) product yield is high; 3) product quality is good, purity in the resulting products is high, and the color is lighter; and 4) no active carbon is consumed and the solvent can be recycled, thereby saving resources and being environmentally friendly.

Process for treating reaction solution containing long chain dicarboxylate

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Shanghai, China

Yi Zheng