Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

doi:10.1016/j.cjche.2018.09.010

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (10): 2102-2111.DOI: 10.1016/j.cjche.2018.09.010

• Process Systems Engineering and Process Safety • Previous Articles Next Articles

Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

Lixiang Jiang^1,2,3, Chufu Li⁴, Ming Xu⁴, Aihua Xing⁴, Rui Feng¹, Jianjun Wu¹

1 China University of Mining and Technology, Xuzhou 221116, China;
2 China Energy Investment Corporation Limited, Beijing 100011, China;
3 Shenhua Ningmei Coal Group Coal Chemical Industry Company, Yinchuan 750411, China;
4 National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China

Received:2018-06-16 Revised:2018-08-20 Online:2018-11-14 Published:2018-10-28
Contact: Ming Xu,E-mail address:xuming@nicenergy.com
Supported by:
Supported by the National Key R&D Program of China (2017YFB0601902).

Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

Lixiang Jiang^1,2,3, Chufu Li⁴, Ming Xu⁴, Aihua Xing⁴, Rui Feng¹, Jianjun Wu¹

1 China University of Mining and Technology, Xuzhou 221116, China;
2 China Energy Investment Corporation Limited, Beijing 100011, China;
3 Shenhua Ningmei Coal Group Coal Chemical Industry Company, Yinchuan 750411, China;
4 National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China

通讯作者: Ming Xu,E-mail address:xuming@nicenergy.com
基金资助:
Supported by the National Key R&D Program of China (2017YFB0601902).

Abstract

Abstract: At present, methanol to propylene (MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥ 99.85 wt% is required as the feed of MTP unit in Lurgi's technology. Therefore, high energy cost for refined methanol production is one of the bottlenecks to improve the economy of MTP technology. Reducing the grade of feed refined methanol may be an effective method to save energy and reduce operation costs in MTP process. In this work, experiments and process simulation were carried out to investigate the influence and feasibility of degrading the methanol feed. Experiments were conducted to investigate the influence of crude methanol feed on conversion and selectivity of MTP reaction as well as the performance of ZSM-5 catalyst. The experimental results showed that degrading the methanol feed had no obvious influence on the conversion and selectivity of MTP reactions and the catalyst deactivation was caused by the carbon accumulation and metals deposition on the active sites. The process simulation results showed that the influence on the conversion and selectivity as well as the stream load of MTP process was negligible if 98mol% methanol was used as feed. Finally, industrial experiments were conducted by adjusting the operation parameters to degrade of feed methanol of the commercial 500 kt·a^-1 MTP unit of Ningmei Group in China. The results of industrial application illustrated that annually 180 kt fuel coal and 150 kt desalted water as well as1770 MW·h^-1 electricity would be saved when the water content increased from 0.01% to 0.4%. This work has identified the feasibility to improve MTP technology by degrading the methanol feed.

Key words: MTP, Methanol, Distillation, Simulation and optimization, Energy saving

摘要： At present, methanol to propylene (MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥ 99.85 wt% is required as the feed of MTP unit in Lurgi's technology. Therefore, high energy cost for refined methanol production is one of the bottlenecks to improve the economy of MTP technology. Reducing the grade of feed refined methanol may be an effective method to save energy and reduce operation costs in MTP process. In this work, experiments and process simulation were carried out to investigate the influence and feasibility of degrading the methanol feed. Experiments were conducted to investigate the influence of crude methanol feed on conversion and selectivity of MTP reaction as well as the performance of ZSM-5 catalyst. The experimental results showed that degrading the methanol feed had no obvious influence on the conversion and selectivity of MTP reactions and the catalyst deactivation was caused by the carbon accumulation and metals deposition on the active sites. The process simulation results showed that the influence on the conversion and selectivity as well as the stream load of MTP process was negligible if 98mol% methanol was used as feed. Finally, industrial experiments were conducted by adjusting the operation parameters to degrade of feed methanol of the commercial 500 kt·a^-1 MTP unit of Ningmei Group in China. The results of industrial application illustrated that annually 180 kt fuel coal and 150 kt desalted water as well as1770 MW·h^-1 electricity would be saved when the water content increased from 0.01% to 0.4%. This work has identified the feasibility to improve MTP technology by degrading the methanol feed.

关键词: MTP, Methanol, Distillation, Simulation and optimization, Energy saving

Lixiang Jiang, Chufu Li, Ming Xu, Aihua Xing, Rui Feng, Jianjun Wu. Investigation on and industrial application of degrading of methanol feed in methanol to propylene process[J]. Chin.J.Chem.Eng., 2018, 26(10): 2102-2111.

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Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

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