PTA装置氢气回收方法分析

Analysis of hydrogen recovery process of PTA plant

介绍了精对苯二甲酸(PTA)生产过程中氢气的使用和排放现状,指出了PTA装置氢气回收的必要性。分析了目前工业中应用较为广泛的氢气回收方法,包括深冷分离法、变压吸附法和膜分离法,对比了3种方法的优缺点。初步设计了PTA装置氢气回收工艺流程,预估了PTA装置氢气回收的经济性。膜分离法具有回收氢气浓度高、投资少等优点,用于PTA装置氢气回收较为适合;膜分离法用于PTA装置氢气回收后,可大幅降低装置的氢气、氮气和蒸汽的使用量,节能效果显著,具有良好的应用前景。

The hydrogen utilization and emission situation was introduced during the production of purified terephthalic acid （ PTA） .The necessity of hydrogen recovery process was put forward for PTA plants .The widely applied hydrogen recovery tech-niques were analyzed , including cryogenic separation , pressure swing adsorption and membrane separation .Their advantages and disadvantages were compared .The hydrogen recovery technological process was preliminarily designed for PTA plants and its eco -nomical efficiency was predicted .The membrane separation technique was suitable for the hydrogen recovery of PTA plants due to the advantages of high recovered hydrogen concentration and low investment .The consumption of hydrogen , nitrogen and steam could be considerably decreased as the membrane separation technique was applied in the hydrogen recovery of PTA plants .The membrane separation technique provided significant energy conservation effect and possessed wonderful prospects .