Patent ID: 9000213
Filing Date: 2015-04-07
Classification: C07C

Abstract:
1. A process for coproducing (i) at least one isocyanate selected from the group consisting of a diisocyanate and a polyisocyantate and (ii) a glycol, the process comprising: (A1) reacting an aqueous alkylene oxide comprising 30 to 60% by weight of water, based on a total weight of the aqueous alkylene oxide, with carbon dioxide, to obtain first reaction mixture comprising alkylene carbonate; then (A2) separating the first reaction mixture into a first and second stream comprising the alkylene carbonate; then (B) hydrolyzing the first stream, to obtain a glycol; (C) dewatering the second stream, to obtain a dewatered stream; (D) hydrogenating an aromatic nitro compound or a nitrile, to obtain (d) an amine; (E) transesterifying the dewatered stream with a monohydroxy alcohol, to obtain a second reaction mixture comprising a dialkyl carbonate and the glycol; and then (F) reacting the second reaction mixture with the amine (d), to produce a third reaction mixture comprising at least one carbamate selected from the group consisting of a monocarbamate, a dicarbamate, and a polycarbamate; (G) cleaving the carbamate in the third reaction mixture, to obtain the diisocyanate, polyisocyanate, or both.