杜邦聚酯装置生产过程中二甘醇稳定性探讨

Study on the Stability of Diethylene Glycol in the Production of DuPont Polyester Plant

介绍了杜邦三釜聚酯装置生产过程中影响熔体中二甘醇质量分数变化的因素,提出了二甘醇质量分数稳定控制的方法。生产实践表明:酯化阶段二甘醇生成量的变化主要受浆料物质的量比、对苯二甲酸平均粒径、酯化反应温度、压力、停留时间、配浆乙二醇中二甘醇质量分数等因素影响;齐聚物管线外源性二甘醇的添加对稳定熔体中二甘醇质量分数起着重要的调节作用,而在缩聚阶段几乎不影响二甘醇质量分数。

The factors affecting the change of the diethylene glycol mass fraction in the melt during the production of DuPont three-kettle polyester plant were introduced.A method for stability control of the diethylene glycol mass fraction was proposed.Production practice shows that the changes of diethylene glycol production during esterification are mainly affected by the slurry molar ratio,PTA average particle size,esterification reaction temperature and pressure,residence time and diethylene glycol mass fraction in blending glycol.The addition of exogenous diethylene glycol in oligomer pipeline played an important regulatory role in stabilizing the diethylene glycol mass fraction in melt,but hardly affects diethylene glycol mass fraction in the polycondensation stage.