对二甲苯降膜结晶动力学

王瑞1 许妍霞1 宋兴福1 徐志刚2 于建国1

(1.华东理工大学国家盐湖综合利用工程技术研究中心, 上海 200237)
(2.常州瑞华化工工程技术有限公司, 江苏常州 213000)

【摘要】降膜结晶是工业生产对二甲苯的重要方法。以多孔介质分形理论为基础开展对二甲苯降膜结晶动力学的研究。通过动力学模型优化实验条件, 结晶条件为进料速度为60 ml·min-1、结晶温度-15℃、原料预冷温度25℃, 发汗条件为升温速率1℃·min-1、发汗终温5℃。在此条件下测定降膜结晶过程中对二甲苯结晶量以及液相夹带量, 建立了晶体生长速率方程和液相夹带速率方程, 相关系数分别为0.967和0.977, 模型可靠。结果表明随着过饱和度的增加, 液相夹带速率增长更快, 晶层中夹带液相体积分数越大, 晶层孔隙率越大。晶体生长速率方程和液相夹带速率方程的建立对工业降膜结晶生产对二甲苯过程中, 通过调节液膜过饱和度控制晶层生长具有重要参考意义。

【关键词】 对二甲苯; 结晶; 动力学; 优化; 过饱和度; 孔隙率;

【DOI】

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 08, Pages 3460-3468

August 2018

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Article Outline

摘要

  • 引言
  • 1 降膜结晶动力学模型建立
  • 2 实验部分
  • 3 实验结果与讨论
  • 4 结论
  • 符号说明
  • 参考文献