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• W2514495553 abstract "Diphenyl carbonate (DPC) is a carbonate ester of formula (C6H5O)2CO, which is mostly used as a critical comonomer in the manufacture of polycarbonate resin, an engineering thermoplastic with high impact resistance and excellent optical properties. Originally, polycarbonate was produced by interfacial (organic/aqueous) polycondensation of phosgene (COCl2) with disodium salt of a bisphenol, such as 2,2-bis(4-hydroxyphenyl)propane (bisphenol A). However, a phosgene-free route was desired because of environmental hazards and governmental restrictions associated with production and storage of extremely toxic phosgene (and chlorine used to synthesize it) and the use of chlorinated solvents. An important phosgene-free, so-called melt process, for the DPC synthesis involving transesterification of diphenyl carbonate in the absence of solvents was independently developed by General Electric (GE), Bayer, Asahi/Chi Mei, and Mitsubishi. DPC is commonly produced by indirect methods, mainly by transesterification of dialkylcarbonates such as dimethyl carbonate produced either from CO, methanol, and oxygen using EniChem technology (SABIC IP) or via carbonylation of methyl nitrite from the reaction of NO with methanol (Bayer) or by methanolysis of ethylene carbonate (Asahi/Chi Mei) or di-n-butyl carbonate from urea and n-butyl alcohol (Mitsubishi Chemical). Ideally, DPC can be prepared directly from phenol, carbon monoxide, and oxygen in a simpler (one-step) energetically favorable reaction. Development of the one-step DPC synthesis process conducted by GE team and other researchers, which resulted in tremendous increase in catalytic activity from tens to greater than 10 000 Pd turnover numbers and eventually in a viable technology process, is described." @default.
• W2514495553 created "2016-09-16" @default.
• W2514495553 creator A5052284737 @default.
• W2514495553 date "2016-08-17" @default.
• W2514495553 modified "2023-10-01" @default.
• W2514495553 title "Oxidative Carbonylation: Diphenyl Carbonate" @default.
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• W2514495553 doi "https://doi.org/10.1002/9783527690121.ch12" @default.
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