The invention relates to a vacuum thermal coupling methanol distillation method and device. Crude methanol raw materials are preheated and then entered into the pre-distillation column. The light impurities are removed from the top of the column. The materials of the pre-distillation column are preheated and connected with the atmospheric distillation column. The materials of the atmospheric distillation column are connected with the pressurized distillation column, the materials of the pressurized distillation column are connected with the vacuum distillation column, and the materials extracted from the side line of the vacuum distillation column are connected with the recovery Atmospheric pressure, pressure and vacuum three-effect thermal coupling is adopted. The top steam of pressurized distillation column is connected with the reboiler of atmospheric distillation column, the top steam of atmospheric distillation column is connected with the reboiler of vacuum distillation column, and the methanol product of the reflux tank of pressurized distillation column is connected with the reboiler of recovery column. Methanol products were produced at the top of three distillation towers: pressurized distillation column, atmospheric distillation column and vacuum distillation column, and methyl ethanol fuel oil was recovered at the top of the column. The invention overcomes the defects of the prior technology and saves energy consumption by 30%-40%. It can produce national standard and AA grade pure methanol in the United States, and has a very broad application prospect.
【技术实现步骤摘要】
一种真空热耦合甲醇精馏方法及装置
本专利技术涉及化工精馏
,具体是一种真空热耦合甲醇精馏方法及装置。
技术介绍
甲醇是一种重要的有机化工原料和性能优良的洁净能源和动力燃料。随着甲醇制烯烃、制二甲醚技术的成功应用,甲醇装置不仅在数量上日益增多,在规模上也迅速增大。甲醇精馏是甲醇生产装置中极为关键的一个单元,它直接关系到精甲醇产品质量的优劣,其能耗约占整个甲醇生产总能耗的20%。所以提高精甲醇产品质量、降低生产能耗和废物处理,愈发引起人们的关注,也成为企业经济效益好坏和市场竞争力强弱的关键。甲醇精馏工艺由最开始的单效(两塔,预塔和主塔),已基本上被德国鲁奇公司的甲醇双效(3塔或3+1塔)所取代。德国鲁奇公司首先在甲醇精馏工艺中引入“热耦合”节能技术,将主精馏塔分为两个塔:加压精馏塔和常压精馏塔,利用加压精馏塔塔顶气相甲醇为常压精馏塔塔底再沸器加热。这就形成3塔流程。3塔流程中,在常压精馏塔设侧线采出包括甲醇在内的杂醇。为了进一步提高甲醇收率,人们又在流程中加入回收塔,将常压精馏塔侧线杂醇进行精馏,回收其中的甲醇。这样就形成3+1塔流程。图1是目前普遍采用的“传统3+1塔工艺流程”,采用预精馏塔、加压精馏塔、常压精馏塔和回收塔串联操作。原料进入预精馏塔脱除轻组分后,塔底甲醇进入加压精馏塔,加压精馏塔塔顶采出甲醇产品,塔釜物料进入常压精馏塔,常压精馏塔塔顶采出甲醇产品,侧线进入回收塔,塔釜采出废水;回收塔塔顶采出甲醇产品,侧线采出杂醇,塔釜采出废水。其中加压精馏塔的塔顶蒸汽作为常压精馏塔的热源,加压精馏塔与常压精馏塔双效热耦合。预精馏塔、加压精馏塔和回收塔均 ...
【技术保护点】
1.一种真空热耦合甲醇精馏方法,其特征在于:采用常压、加压、真空三效热耦合,加压精馏塔塔顶蒸汽与常压精馏塔再沸器连接,常压精馏塔塔顶蒸汽与真空精馏塔再沸器连接;预精馏塔塔釜物料经预热后与常压精馏塔连接;常压精馏塔塔釜物料与加压精馏塔连接,加压精馏塔塔釜物料与真空精馏塔连接,真空精馏塔侧线采出物料与回收塔连接。
【技术特征摘要】
1.一种真空热耦合甲醇精馏方法,其特征在于:采用常压、加压、真空三效热耦合,加压精馏塔塔顶蒸汽与常压精馏塔再沸器连接,常压精馏塔塔顶蒸汽与真空精馏塔再沸器连接;预精馏塔塔釜物料经预热后与常压精馏塔连接;常压精馏塔塔釜物料与加压精馏塔连接,加压精馏塔塔釜物料与真空精馏塔连接,真空精馏塔侧线采出物料与回收塔连接。2.如权利要求1所述的方法,其特征是原料预热至泡点温度后进入预精馏塔精馏,预精馏塔塔顶采出平衡气,塔釜物料进入常压精馏塔。3.如权利要求1所述的方法,其特征是常压精馏塔的操作压力为0.03~0.22MpaG,塔顶温度为90~97℃,塔釜温度为95~105℃;塔顶出甲醇产品,塔釜物料进入加压精馏塔。4.如权利要求1所述的方法,其特征是加压精馏塔的操作压力为0.5~0.8MpaG,操作温度为115~135℃,塔釜温度为127~145℃;加压精馏塔塔顶采出甲醇产品,塔釜物料进入真空精馏塔。5.如权利要求1所述的方法,其特征是真空精馏塔的操作压力为-0.055~-0.04MpaG,操作温度为45~62℃,塔釜温度为80~86℃;真空精馏塔塔顶采出甲醇产品,塔釜物料为废水,经冷却至~40℃去污水处理...
【专利技术属性】
技术研发人员:丛山,田玉峰,李斌,刘璐,杨祖杰,李鑫钢,
申请(专利权)人:北洋国家精馏技术工程发展有限公司,
类型:发明
国别省市:天津,12
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