Method for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates

   
   

Unexpected corrosion of downstream sections of a dialkyl carbonate manufacturing apparatus has been traced to alkyl chloroformate impurities, which slowly decompose to yield hydrochloric acid. An improved process and apparatus for dialkyl carbonate synthesis reduce corrosion by physically removing or chemically decomposing the alkyl chloroformate impurities within the corrosion-resistant upstream sections of the apparatus.

A corrosão inesperada de seções downstream de um instrumento dialkyl do manufacturing do carbonato foi seguida às impurezas alkyl do chloroformate, que decompose lentamente para render o ácido hydrochloric. Um processo e um instrumento melhorados para a síntese dialkyl do carbonato reduzem a corrosão fisicamente removendo ou quimicamente decomposing as impurezas alkyl do chloroformate dentro das seções rio acima corrosion-resistant do instrumento.

 
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