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

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,,

1.
a Chengdu Institute of Organic Chemistry, the Chinese Academy of Sciences, Chengdu 610041, Sichuan, China;

Corresponding author: WANG Gongying,
Received Date: 18 September 2012
Available Online: 26 November 2012
Fund Project: 国家科技支撑计划(2006BAC02A08) (2006BAC02A08)中国科学院知识创新工程重要方向项目(KGCX2-YW-215-2). (KGCX2-YW-215-2)

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.
- Nano cuprous oxide,
- Methylene-di(phenylisocyanate),
- Catalytic thermal decomposition,
- Methylenediphenyldi(phenylcarbamate),
- Isocyanate,
- Methylene-di(phenylene carbamate)
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Solvent-free thermal decomposition of methylenediphenyl di(phenylcarbamate) catalyzed by nano-Cu2O

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