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Catalytic synthesis of toluene‐2,4‐diisocyanate from dimethyl carbonate
Author(s) -
Wang Yanji,
Zhao Xinqiang,
Li Fang,
Wang Shufang,
Zhang Jiyan
Publication year - 2001
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.455
Subject(s) - dimethyl carbonate , toluene , catalysis , chemistry , nitrobenzene , yield (engineering) , solvent , tetrahydrofuran , diamine , toluene diisocyanate , organic chemistry , nuclear chemistry , polymer chemistry , polyurethane , materials science , metallurgy
The process for catalytic synthesis of toluene‐2,4‐diisocyanate (TDI) from dimethyl carbonate (DMC) consists of two steps. Starting from the catalytic reaction between toluene‐2,4‐diamine (TDA) and DMC, dimethyl toluene‐2,4‐dicarbamate (TDC) is formed, and then decomposed to TDI. For the first step, the yield of TDC is 53.5% at a temperature of 250 °C, over Zn(OAc) 2 /α–Al 2 O 3 catalyst. For the second step, the yield of TDI is 92.6% at temperatures of 250–270 °C and under pressure of 2.7 kPa, over uranyl zinc acetate catalyst, when di‐ n ‐octyl sebacate(DOS) is used as heat‐carrier, and a mixture of tetrahydrofuran (THF) and nitrobenzene is used as solvent. © 2001 Society of Chemical Industry