甲醇精馏工艺技术探讨  

Discussion on Methanol Distillation Process Technology

作　　者：周明灿 向林 麻小军 Zhou Mingcan;Xiang Lin;Ma Xiaojun(China Chengda Engineering Co.,Ltd.,Chengdu 610041,China;Xinjiang Zhongtai New Materials Co.,Ltd.,Toksun 838100,China)

机构地区：[1]中国成达工程有限公司,四川成都610041 [2]新疆中泰新材料股份有限公司,新疆托克逊838100

出　　处：《化工设计》2024年第6期32-35,1,2,共6页Chemical Engineering Design

摘　　要：甲醇生产过程中需要通过精馏处理方能制得精甲醇产品,现有甲醇精馏工艺采用蒸汽(或其它载热介质)作为精馏塔再沸器热源,精馏塔塔顶蒸汽使用循环冷却水实现冷凝,操作能耗高。传统3塔精馏工艺吨甲醇的蒸汽消耗一般约1.25吨,循环水消耗约75吨;5塔精馏工艺吨甲醇的蒸汽消耗可降低至0.75吨,循环水消耗可降低至45吨,相比传统3塔精馏工艺,节能降耗效果显著,但工艺流程复杂。采用MVR甲醇精馏工艺,将精馏塔塔顶蒸汽增压后引至塔釜再沸器,利用塔顶蒸汽冷凝放出的热量加热塔釜液,可实现外供热量零消耗,同时大大降低循环冷却水消耗。虽然MVR甲醇精馏工艺需要消耗塔顶蒸汽压缩功,但节能综合效益显著。在减碳节能、绿电供应占比日益增加的发展趋势下,MVR甲醇精馏工艺将得到行业的青睐和推广。In the methanol production process,refined methanol products can only be obtained through distillation treatment.The existing methanol distillation process uses steam(or other heat-carrying media)as the heat source for the reboiler of the distillation column,and the steam at the top of the distillation column is condensed by using circulating cooling water,resulting in high operating energy consumption.In the conventional three-column distillation process,the steam consumption per ton of methanol is generally about 1.25 tons,and the circulating water consumption is about 75 tons.However,in the five-column distillation process,the steam consumption per ton of methanol can be reduced to 0.75 tons,and the circulating water consumption can be reduced to 45 tons.Compared with the conventional three-column distillation process,the effect of energy conservation and consumption reduction is remarkable,but the process flow is rather complicated.Adopting the Mechanical Vapor Recompression(MVR)methanol distillation process,the steam at the top of the distillation column is pressurized and then led to the reboiler at the bottom of the column.By utilizing the heat released during the condensation of the steam at the top of the column to heat the liquid at the bottom of the column,zero consumption of externally supplied heat can be achieved,and at the same time,the consumption of circulating cooling water can be greatly reduced.Although the MVR methanol distillation process requires the consumption of compression work for the steam at the top of the tower,the comprehensive energy-saving benefits are remarkable.In the development trend where carbon reduction,energy conservation and the proportion of green electricity supply are increasing day by day,the MVR methanol distillation process will be favored and promoted in the industry.

关 键 词：甲醇精馏 MVR精馏 节能减排 

分 类 号：TQ223.121[化学工程—有机化工]