| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an aromatic polyester with which sticking materials sticking to a wall surface of a vapor-phase part of a polycondensation vessel are reduced and foreign materials in products can resultantly be reduced to simultaneously reduce both clogging frequency of a take-out nozzle of the polycondensation vessel and washing frequency of the polycondensation vessel in the method for producing the aromatic polyester by heating an acetylation reaction solution obtained by acetylating raw material monomers of the aromatic polyester with acetic anhydride and carrying out the polycondensation. SOLUTION: The method for producing the aromatic polyester is characterized as follows. The temperature of the sidewall and upper lid in the vapor-phase part of the polycondensation vessel are heated to a temperature not lower than (liquid temperature in the polycondensation vessel-20°C) during heating and carrying out of the polycondensation reaction in the method for transferring the acetylation reaction solution obtained by acetylating the raw material monomers of the aromatic polyester with the acetic anhydride in an acetylation reaction vessel to the polycondensation vessel, heating the reaction solution and conducting the polycondensation. COPYRIGHT: (C)2007,JPO&INPIT
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