Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (ningbo) Co., Ltd.

Zilin Ni

Hao Chen

Zhongying Chen

Weiqi Hua

Yuan Li

Qingmei Jiang

Hui Wang

Congying Zhang

Jinhong Song

Zaigang Yang

Wangshun Qi

Bingbo Hu

Shuang Hu

Zhiyuan Liu

Xudong Wang

Zhanyu Zhao

Hua Mei

Dewei Yu

Shanjian Cao

Jun Qu

The present invention relates to a catalyst for fixed bed aniline rectification residue recycling and preparation method thereof. Based on the total weight of the catalyst, the catalyst comprises the following components in percentage by weight: 5-40% of an active component, 2-30% of a first cocatalyst component, 10-30% of a second cocatalyst component and the balance of carrier, wherein the active component is NiO; the first cocatalyst component is one or more of Fe, Mo, Cr or Co oxide; and the second cocatalyst component is one or more of La, Zr, Y or Ce oxide. The catalyst is prepared through co-precipitation. The catalyst shows high activity and stability in the waste liquid treatment process, and can still maintain high rectification residue cracking rate after reaction of 200 hours.

Catalyst for fixed bed aniline rectification residue recycling and preparation method

The present invention discloses a method for intermittently producing 4,4'-diaminodicyclohexyl methane (HMDA) with a low amount of the trans-trans isomer thereof, which comprises: controlling the reaction process by stopping the reaction when, except for a solvent, the reaction solution comprises MDA of 0-5 wt % and HMDA of 1-20 wt %; and b) separating the reaction solution obtained from step a) by conventional means to obtain HMDA product with desired purity, and allowing the un-reacted material and intermediate product to be recycled to the reactor after being accumulated. The method of the present invention decreases the amount of the trans-trans isomer in HMDA, increases the yield of the reaction, and reduces the production cost. The present invention also provides a post treatment process of the reaction mixture.

Method for intermittently producing 4,4'-diaminodicyclohexylmethane with a low amount of the trans-trans isomer

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Shandong, China

Zilin Ni