| 摘要 |
Continuous production of polyesters by the (trans)esterification of dicarboxylic acids, preferably terephthalic acid and/or their esters with diols, preferably ethylene glycol in at least one reaction stage, comprises use of a vertical reactor having three reaction zones with a pressure of 10-40% of the diol equilibrium pressure of the pre-polycondensation product. A process for the continuous production of polyesters (I) by the (trans)esterification of dicarboxylic acids, preferably terephthalic acid and/or their esters with diols, preferably ethylene glycol in at least one reaction stage, pre-polycondensation of the (trans)esterified products under a vacuum by means of a vertical reactor and polycondensation of the pre-polycondensation product in at least one polycondensation stage comprises use of a vertical reactor with a pressure of 10-40% of the diol equilibrium pressure of the pre-polycondensation product, passing the (trans)esterification product in free movement through a first reaction zone comprising at least one ring shaped channel under limited heating, a second reaction zone formed by one or more concentric ring channels and a stirred reactor base comprising the third reaction zone. An Independent claim is included for a device for carrying out the process characterized in having a heating tube register in the channels of the first reaction zone in the direction of flow, whose tubes contain plates at right angles to the flow direction.
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