Wanhua Chemical Group Co., Ltd.

Qingdao Haier Air-conditioning Electronic Co., Ltd.

Lei Zhao

Yuan Li

Yonghua Shang

Jie Zhang

Wenbin Li

Xuelei Cui

Ye Sun

Yong Yu

Jingxu Wang

Wei He

Degang Liu

Jipei Xie

Qiankun Liu

Zhiqiang Xu

Hongliang Zhang

A method for preparing isophorone diisocyanate by (1) reacting isophorone with hydrogen cyanide in the presence of a catalyst to obtain isophorone nitrile; (2) reacting the isophorone nitrile obtained in step (1) with ammonia gas and hydrogen in the presence of a catalyst to obtain isophorone diamine; and (3) subjecting the isophorone diamine to a phosgenation reaction to obtain the isophorone diisocyanate, wherein the content of impurities containing a secondary amine group in the isophorone diamine that undergoes the phosgenation reaction in step (3) is ≤0.5 wt. The method reduces the content of hydrolyzed chlorine in the isophorone diisocyanate product, improves the yellowing resistance of the product, and the harm due to presence of hydrolyzed chlorine in the product is reduced.

Method for preparing isophorone diisocyanate

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Shandong, China

Lei Zhao