Solvent-free thermal decomposition of methylenediphenyl di(phenylcarbamate) catalyzed by nano-Cu2O

doi:10.1016/S1872-2067(11)60494-4

Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (3): 548-558.DOI: 10.1016/S1872-2067(11)60494-4

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Solvent-free thermal decomposition of methylenediphenyl di(phenylcarbamate) catalyzed by nano-Cu₂O

WANG Qingyin^a,b, KANG Wukui^c, ZHANG Yi^a,b, YANG Xiangui^a, YAO Jie^a, CHEN Tong^a, WANG Gongying^a

a Chengdu Institute of Organic Chemistry, the Chinese Academy of Sciences, Chengdu 610041, Sichuan, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, Shandong, China

Received:2012-09-18 Revised:2012-11-26 Online:2013-04-02 Published:2013-04-03
Supported by:
This work was supported by the National Key Technology R&D Program (2006BAC02A08); Knowledge Innovation Project of the Chinese Academy of Sciences (KGCX2-YW-215-2).

Abstract

Abstract:

Methylene di(phenylisocyanate) (MDI) was prepared by thermal decomposition of methylenediphenyl di(phenylcarbamate) (MDPC) under solvent-free conditions with a nano-Cu₂O catalyst. The preparation of nano-Cu₂O was investigated in detail to obtain the optimal catalytic performance. The thermal decomposition reaction conditions, including reaction temperature, reaction pressure, and reaction time, were studied in the presence of nano-Cu₂O. The results show that Cu₂O prepared using a hydrolysis method and then calcined at 300℃ in Ar atmosphere for 2 h exhibited the optimal catalytic activity. The optimal reaction conditions were as follows: mass ratio of catalyst to MDPC 6.0 × 10^-4, reaction temperature 220℃, reaction time 12 min, and reaction pressure 0.6 kPa. Under these conditions, the conversion of MDPC reached 99.8% and 86.2% MDI selectivity was achieved.

Key words: Nano cuprous oxide, Methylene-di(phenylisocyanate), Catalytic thermal decomposition, Methylenediphenyldi(phenylcarbamate), Isocyanate, Methylene-di(phenylene carbamate)

WANG Qingyin, KANG Wukui, ZHANG Yi, YANG Xiangui, YAO Jie, CHEN Tong, WANG Gongying. Solvent-free thermal decomposition of methylenediphenyl di(phenylcarbamate) catalyzed by nano-Cu₂O[J]. Chinese Journal of Catalysis, 2013, 34(3): 548-558.

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Solvent-free thermal decomposition of methylenediphenyl di(phenylcarbamate) catalyzed by nano-Cu₂O

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