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- W2358432880 abstract "Dibutyl toluene-2,4-dicarbamate(BTDC) which is a precursor of toluene diisocyanate was synthesized from 2,4-diamino-toluene(TDA), urea and butyl alcohol. The catalytic behavior and the stability of several catalysts were evaluated in the reaction of BTDC synthesis, and the results show that SiO2 presents better catalytic performance. Over SiO2 catalyst, the optimal conditions are as follows: calcination temperature 400 ℃, reaction temperature 200 ℃, reaction time 6 h, catalyst mass fraction 30%(based on TDA) and TDA ∶ urea ∶ butyl alcohol =1∶5∶65. Under these conditions, TDA conversion can reach 96.5% and BTDC yield can reach 81.7%. The effects of the varieties of the reaction conditions on the BTDC yield were analyzed, and the structure of SiO2 catalyst was characterized by BET." @default.
- W2358432880 created "2016-06-24" @default.
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- W2358432880 date "2014-01-01" @default.
- W2358432880 modified "2023-09-24" @default.
- W2358432880 title "Synthesis of dibutyl toluene dicarbamate catalyzed by SiO_2" @default.
- W2358432880 hasPublicationYear "2014" @default.
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