Diphenyl-carbonate

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  • Diphenyl carbonate is an organic chemical compound. It is both as a monomer in combination with bisphenol A in the production of polycarbonate polymers and a product of the decomposition of polycarbonates.
  • DPC is produced in two steps: phenol and DMC react to form phenylmethyl carbonate (PMC), followed by PMC disproportionation to DPC.
  • The diphenyl carbonate is prepared by reacting dimethyl carbonate with phenol, so no phosgene is used as in the earlier process.
  • Early commercial production of polycarbonate employed reacting phosgene with phenol to produce diphenyl carbonate, a high boiling liquid that was then reacted with bisphenol A to produce the polymer and liberate phenol for reuse.
  • The transesterification process using diphenols and diphenyl carbonate (DPC) has been given more recognition instead of the interfacial polycondensation of diphenols with phosgene, because of advantages like no toxic phosgene, no solvent, and no salt formation.
  • Diphenyl carbonate (DPC) is a key rawmaterial for producing aromatic polycarbonates. It is still mainly synthesized by using severely toxic phosgene as a raw material.
  • Diphenyl Carbonate is a precursor in the production of Polycarbonate (PC). Polycarbonate is widely employed as an engineering plastic important to the modern lifestyle; used in, for example, the manufacture of electronic appliances, office equipment and automobiles.
  • Polycarbonate (PC) is widely employed as an engineering plastic important to the modern lifestyle and used in, for example, the manufacture of electronic appliances, office equipment and automobiles.
  • Production is expected to increase by around 6% per year at least until 2010 with the fastest regional growth expected in East Asia, averaging 8.7% per year through 2009.
  • There is increasing demand for a safer and environmentally favorable process for DPC production. In recent years, some porous carriers, such as active carbon, molecular sieve, porous alumina and the like, have been used in the synthesis of DPC, however, the yield of DPC is less than 6.2%.

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