Comparison of methanol distillation tower rectification and Twin Towers
1 精馏原理抗疫祝福语
1 distillation principle
精馏是根据在相同温度下, 同一液体混合物中不同组分的挥发度不同, 经多次部分气化和多次部分冷凝最后得到较纯的组分, 实现混合物分离的操作过程。
dare的用法Distillation is under the same temperature, different degree of different components in a liquid mixture of volatile, after multiple partial gasification and multiple partial condensation of the last to be compared with that of the pure components, and the operating process of parating mixtures.
轻组分和重组分，混和液 进入第一分离器, 若将第一级溶液部分气化得到气相产品冷凝液,然后再将冷凝液在第二级分离器中部分气化, 再经第二级冷凝器冷凝得溶液中的塔釜重组分必大于塔顶游戏笔记本, 这种部分气化部分冷凝的次数( 即级数) 越多, 所得轻组分浓度越高, 最后几乎可得到纯态的易挥发组分。同理, 若将从各分离器所得溶液产品进行多次部分气化和分离, 那么这种级数愈多, 得到的溶液组分浓度越高, 最后可得到几乎纯态的难挥发组分。
Light fraction and reorganization, mixed fluid into the parator, the first, if the first stage solution partial gasification get gas pha product condensate, then condensate in the cond stage parator partial gasification, and the cond stage condenr and is condend to solution of the tower kettle restructuring must be higher than the top of the tower. This part of the partial gasification condensation number (i.e. more ries, the resulting light group concentration higher. Finally, almost pure state of volatile components i
s. Similarly, if the from the parator of the resulting solution products were repeatedly partial gasification and paration, then the ries more, group to obtain the solution concentration is high, finally we can get almost pure state of difficult volatile components.
常温、常压下, 甲醇是易挥发和易燃烧的无色液体, hurt的用法纯甲醇的沸点为64.5-64.8℃, 杂质的沸点有高有低,低于甲醇沸点的为轻馏分, 高于此值的为重馏分。一般情况下, 甲醇中所含轻馏分杂质主要有二甲谜、乙醛、丙酮等, 约占粗甲醇重量的1%; 重馏分主要有水、异丁醇、异丁醚等约占粗甲醇重量的4~ 5% 。甲醇合成不论采用何种催化剂, 均受其选择性的限制以及合成条件( 压力、温度和合成气组成) 的影响, 在进行甲醇合成反应的同时, 还会伴随着一系列副反应发生, 甲醇合成过程中副反应产物多达40 多种, 这些杂质只有通过精馏工序加以去除, 软盘是什么意思才能得到符合国标要求的精甲醇。
Under normal temperature and pressure, methanol is volatile and flammable, colorless liquid, the boiling point of pure methanol as 64.5-64.8 dig’s, high and low boiling point impurities, below the boiling point of methanol for the light fraction, this value is higher than the for heavy fraction. Under normal circumstances, methanol containing impurities of light fraction are a mystery, acetaldehyde, acetone, accounting for about 1% of the crude methanol weight; heavy fraction mainly water and isobutyl alcohol, isobutyl ether accounted for about 4 ~ 5% of the weight of crude methanol. Methanol synthesis regardless of the kind of catalyst and are influenced by the lective constraints and synthesis conditions (pressure, temperature and synthesis gas composition) and in methanol synthesis reaction at the same time, will be accompanied by a ries of side reaction, methanol synthesis process of side reaction products up to more than 40 kinds.
世界上最长的腿The impurities only through the distillation process to be removal, in order to meet the requirements of the national standard of refined methanol.
2 双塔精馏和三塔精馏流程
2 Twin Towers tower distillation and distillation process
目前我国在甲醇生产过程中主要使用的甲醇精馏技术有双塔精馏和三塔精馏工艺。
At prent, China's methanol distillation technology is mainly ud in the production process of methanol distillation and distillation process of three Twin Towers.
2.1 双塔精馏工艺
2.1 Twin Towers distillation process
该流程为我国以前老的甲醇装置中采用是较广的一种精馏流程。精甲醇先经预精馏塔, 经预精馏后的含水甲醇直接由泵输送经热交换器后再至主精馏塔, 最终在主精馏塔将甲醇与水、重组份及残余轻组份进行有效分离，从而得到精甲醇产品。生产实践证明双塔精馏流程简单、操作方便、运行稳定, 能满足甲醇生产要求。
This process is a distillation process ud in the old methanol plant of our country.. Refined methanol to the pre distillation tower and the pre distillation of aqueous methanol directly by the pump delivery after heat exchanger to distillation, culminating in distillation will methanol and water, restructuring and residual light component of effective paration, so as to obtain the refined methanol product. The production practice shows t
hat the distillation process of Twin Towers is simple, convenient and stable, and can meet the requirements of methanol production..
来自粗甲醇储槽的甲醇, 经泵加压, 再经粗甲醇预热器加热到45℃后进入预精馏塔, 在预精馏塔脱除轻馏分后, 直接由泵输送至主精馏塔, 进一步把高沸点的重馏分杂质脱除, 主要是水、异丁基油等。从塔顶或侧线采出的精甲醇经过冷却器冷却至常温后, 就可得到纯度在99.9% 以上的符合国标的精甲醇产品。
From crude methanol storage tank of methanol and presd by pump, then the crude methanol preheated for heating to 45 DEG backward into the pre distillation column, after the pre distillation column removed light fraction and directly by a pump to the primary distillation tower and further the high boiling point of heavy fraction of impurity removal, is mainly water, different Ding Joyous etc.. Mined from the top of the tower or the lateral line of fine methanol after cooler cooling to room temperature can be obtained with a purity of 99.9% of all conform to the national standard of refined methanol product.
2.2三塔精馏工艺
2.2 three tower distillation process
三塔流程是目前甲醇生产装置应用最广泛的精馏工艺。我公司年产20万t 甲醇装置就用此方法,三塔均采用复合填料, 且我国目前在建的甲醇装置亦大部分采用此法粗甲醇按次序分别进入预精馏、加压塔和常压塔进行精馏, 大部分轻组份在预精馏塔去除, 加压塔和常压塔均采出产品, 约各占一半。美国曾报导过另一种三塔流程, 该流程的特点是三个塔基本上等压操作, 由第三精馏塔采出产品,第二精馏塔分离水份, 第一精馏塔相当于预精馏塔,主要用作分离轻组份, 我国尚未采用此种精馏流程,目前我应用最广泛的三塔精馏工艺, 其具有精馏能耗低、操作稳定、产品质量好等突出优点, 但操作相对比较复杂。从进料泵来的粗甲醇加入碱液后经预热器加热后进入预塔, 进塔后与从再沸器来的气流换热后, 未冷凝的部分低沸点组分及不凝气进入其中, 绝大部分甲醇经冷却器冷凝后回流, 不凝气体经过五合一冷却器在冷凝后，经气液分离器后液相回收, 气相进入放空总管; 出预塔的甲醇液经过加压塔给料泵加压后进入加压塔, 进塔后与从再沸器来的气流换热后, 气相从塔顶出塔后进入常压塔再沸器给常压塔提供热源, 冷凝后的甲醇进入加压塔回流槽, 一部分打回流, 一部分作为产品采出。液相出塔后进入常压塔, 进塔后与从再沸器来的气流换热后, 气相出塔顶后经常压塔冷凝器冷却后进入常压塔回流槽, 一部分打回流, 一部分作为产品采出, 常压塔底的排出废水,合格后送往污水处理。
Three tower distillation process process is currently the most widely ud methanol production equipment. Our company with an annual output of 2 00000 tons of methanol d
evice is using this method, the three towers are ud in composite filler and our country currently in the methanol plant also most of the u of this method of crude methanol in order, respectively, into the pre distillation, pressurized column and atmospheric tower distillation, most of the light component in the pre distillation column removal, tower and atmospheric column compression were produced products, each accounted for about half. The United States has reported another three tower process, characteristics of the process are three basic tower on isobaric operation. By the third column produced products, the cond distillation column water paration, first distillation tower is equivalent to the pre distillation column. It is mainly ud as the light component paration, has not been adopted in China this kind of distillation process, currently the most widely ud of three tower distillation process has prominent advantages of distillation of low energy consumption, stable operation, product quality good, but the operation is relatively complex. From the crude methanol feed pump to add the lye into the pre heated by the preheated tower, into the tower and the gas from recoiled heat, some low boiling component and non condensable gas is not condend into them, most
of the methanol cooler after condensation reflux, non condensable gas after five a cooler in the condensation, parating the liquid liquid pha after recovery, gas pha into the vent duct; pre column methanol solution through pressurized column feed pump pressure after entering into the tower after tower pressure, and the gas from recoiled heat, gas pha from the top of the tower to enter the atmospheric tower the recoiled to provide heat for atmospheric tower, after the condensation of methanol into the pressurized tower backflow slot, a part of playing the return, as part of the product. Liquid pha of the tower into the atmospheric tower, tower and after from the re flow boiling heat transfer, gas pha out the top of the tower after often pressure condenr cooling to enter the atmospheric tower reflux groove, a part to fight back, as a part of the products produced, atmospheric pressure tower bottom discharge of wastewater, qualified evacuation to wage treatment.
