甲醇制烯烃工艺中副产丁二烯的高效抽提技术研究

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中图分类号： TQ649.4+2 文献标志码：A 文章编号：1001-5922（2026）03-0634-04

Research on high-efficiency extraction technology of by-product butadiene in methanol-to-olefins process

LU Minlei （Nanjing Chengzhi Clean Energy Co.，Ltd.，Nanjing 21OOOO，China）

Abstract：To optimize the separation technology of crude butadiene produced from oxidative dehydrogenation of byproduct C4 in the methanol-to-olefins （MTO） process，a systematic comparison was conducted on the extraction processes using three solvents ： N -methylpyrrolidone（NMP），dimethylformamide（DMF），and acetonitrile（ACN）. A procesimulation model was established on the Aspen Plus platform according to the characteristicsof crude butadiene generated from the oxidative dehydrogenationof MTO by-product C4，and theNRTL-RK thermodynamic method was employed to describe the highly non-ideal liquid phase system.The research results showed that under the conditions of achieving 99.6% product purity and over 98.5% recovery rate，the NMP method exhibited obvious advantages，with a unit product energy consumption of only 28.1 GJ/t and a solvent consumption of 0.45kg/t Compared with the DMF and ACN methods，its energy consumption was reduced by about 4% and 6% respectively， and solvent consumption was decreased by 58% and 78% .Economic evaluation indicated that the total investment and annual operating cost of the NMP method were 12% and 18% ， 8% and 15% lower than those of the DMF and ACN methods respectively.In adition，the low toxicityand thermal stabilityof NMP solvent presented better performance in terms ofenvironment，health and safety（EHS），making itsuitable for the high-efficiencyseparationof MTO by-product butadiene on an industrial scale.

Key words ： methanol to olefin process ; by product butadiene ; extraction technology

丁二烯作为关键的基础化工原料，其高效分离技术是石化工业的研究重点。（剩余6105字）