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›› 2014, Vol. 14 ›› Issue (4): 587-592.

• 反应与分离 • Previous Articles     Next Articles

Separation of Polymethylene Polyphenyl Polyisocyanate (PMPPI) from the PMPPI-Chlorobenzene Pyrolysis Liquid Using Molecular Distillation

LONG Shi-liang CAO Yan LI Hui-quan CHEN Jia-qiang WANG Li-guo HUANG Ke-lin   

  1. Key Laboratory of Green Process and Engineering and National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences National Engineering Laboratory for Clean Production Technology of Hydrometallurgy,Institute of Process Engineering,CAS Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2014-06-06 Revised:2014-07-22 Online:2014-08-20 Published:2014-08-20
  • Contact: LONG Shi-liang

分子蒸馏法从异氰酸酯热解液中分离多亚甲基多苯基多异氰酸酯

龙世良 曹妍 李会泉 陈家强 王利国 黄科林   

  1. 中国科学院过程工程研究所湿法冶金与清洁生产技术国家工程实验室 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所
  • 通讯作者: 龙世良

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Abstract: Molecular distillation was used to separate polymethylene polyphenyl polyisocyanate (PMPPI) from PMPPI-chlorobenzene pyrolysis liquid via orthogonal experiments using an OA25(45) design, the optimal separation conditions of the simulated PMPPI- chlorobenzene solution were determined as feed flow rate 2 mL/min, distillation temperature 100℃, wiper rotating speed 120 r/min and distillation pressure 4.0 kPa. Under the optimal conditions, the purity of PMPPI reached as high as 99.65%. Finally, the real PMPPI- chlorobenzene pyrolysis liquid was separated using the above optimal conditions, chlorobenzene could not be detected in the final product with HPLC analysis, indicating that the purity of PMPPI approached to 100%.

Key words: non-phosgene, thermal decomposition, polymethylene polyphenyl polyisocyanate, separation, molecular distillation

摘要： 采用分子蒸馏技术从异氰酸酯热解液中分离多亚甲基多苯基多异氰酸酯(PMPPI)，通过设计L25(56)正交实验对PMPPI-氯苯的模拟热解液进行分离，得到最佳工艺条件为：进料速度2 mL/min、蒸馏温度100℃、转子速度120 r/min、蒸馏压强4.0 kPa，该条件下PMPPI的分离纯度高达99.65%. 使用上述最佳分离条件对多亚甲基多氨基甲酸甲酯(PMDC)热解分离PMPPI的真实热解液进行分离，分离高效液相色谱检测不到氯苯，证明分子蒸馏可从异氰酸酯热解液中高效分离PMPPI.

关键词: 非光气法, 热解, 多亚甲基多苯基多异氰酸酯, 分离, 分子蒸馏

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