CN1328232C - Double-efficient energy-saving and water-saving rectifying system and process for methanol - Google Patents
Double-efficient energy-saving and water-saving rectifying system and process for methanol Download PDFInfo
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- CN1328232C CN1328232C CNB2006100132699A CN200610013269A CN1328232C CN 1328232 C CN1328232 C CN 1328232C CN B2006100132699 A CNB2006100132699 A CN B2006100132699A CN 200610013269 A CN200610013269 A CN 200610013269A CN 1328232 C CN1328232 C CN 1328232C
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Abstract
The present invention relates to a methanol double-effect rectification energy-saving water-saving system and a process. The system comprises a coarse methanol preheater, a pre-rectifying tower, a post methanol heater, a pressurization tower, an atmospheric tower, a reboiler, a condensation reboiler and a methanol recovery tower. The system is characterized in that a lateral line extraction pipe of the atmospheric tower is connected with a coller, and the coller is connected with a feed opening of the recovery tower; the bottom of the atmospheric tower is connected with an extraction pipe of an alkali containing salt solution; the lateral line of the recovery tower is connected with a fusel oil extraction pipe; an effluent disposal pipe at the tower bottom is connected with an extraction water pipe of the pre-rectifying tower. The existing methanol double-effect rectification devices do not need any additional devices when reforming, and only the connection mode of the original partial devices is changed; the process greatly reduces rectification energy consumption, saves extraction water consumption and increases the economic benefits of the rectification processes.
Description
Technical field
The present invention relates to Chemicals purification technique field, particularly be double effect rectification for methanol energy-saving and water-saving system and technology.
Background technology
Methyl alcohol is a kind of very important basic chemical raw materials, also is a kind of clear energy sources and power fuel of excellent property, plays a part very important on current globalization chemical product market.And rectifying is a very important chemical engineering unit operation in the methanol production; be directly connected to the problems such as quality, environment protection, energy consumption and production cost of product; so energy consumption in the saving rectifying and water consumption are to promote the important technical links that methanol production further develops, and more and more cause people's attention.
Rectification cell in the existing methanol device of China is divided into single-action (double tower), economic benefits and social benefits (three towers or three-plus-one tower) distillation process substantially.Advantages such as it is simple that the former has flow process, easy to operate, stable, but have the high defective of energy consumption; Latter's double-effect rectification process flow diagram as shown in Figure 1, utilize the thermal source of the heat of condensation of pressurization cat head methanol steam as the atmospheric tower reboiler, form double-effect rectification, realize making full use of of heat, both saved steam, the another saving water coolant of deciding degree is compared with single-action technology, reduce energy consumption about 30%, so this technology is the rectification process that generally adopts at present.But by analyzing as can be known, double-effect rectification still has a lot of links to remain to be improved.With three-plus-one tower distillation process is example, discharging is as the charging of recovery tower at the bottom of the common employing atmospheric tower, this technology has certain limitation: 1. the methanol concentration owing to discharging at the bottom of the atmospheric tower is significantly less than the thick methanol concentration of charging, so recovery tower wants to reach the ideal separating effect, must strengthen reflux ratio, increase the load of recovery tower; 2. bring a large amount of salt and the excess base that produce in the pre-rectifying tower into recovery tower, caused containing the salt and alkali component of higher concentration in the effluent discharge at the bottom of the recovery tower and can not recycle, can only be sent to sewage work, caused a large amount of wastes.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming of the prior art, a kind of reasonable in design, product purity is high, energy consumption, water consumption is low, production process and quality product are easy to control double effect rectification for methanol energy-saving and water-saving system and technology are provided.
A kind of double effect rectification for methanol energy-saving and water-saving of the present invention system comprises: thick methanol preheater, pre-rectifying tower, prognosis methyl alcohol well heater, pressurizing tower, atmospheric tower, reboiler, condensation reboiler and methanol distillation column; It is characterized in that atmospheric tower side line extraction pipe is connected with water cooler, water cooler is connected with the recovery tower opening for feed again; Connect at the bottom of the atmospheric tower and contain alkali salt solution extraction pipe; The recovery tower side line connects potato spirit extraction pipe; The waste liquid vent pipe at the bottom of the tower and the extraction water pipe coupling of pre-rectifying tower.
Concrete processing condition of the present invention are as follows:
The extraction water temperature that enters the pre-rectifying tower middle and upper part is 65～70 ℃; The temperature of balance prognosis methyl alcohol is 125～130 ℃, and pH value is 7～9; The methanol steam temperature of pressurizing tower cat head is about 120～123 ℃, with condensate temperature after the condenser heat exchange of boiling again be 118～120 ℃; From pressurizing tower middle part side line extraction steam material, behind water cooler, flow into recovery tower by static pressure difference; The potato spirit of recovery tower bottom side line extraction 0.5～2%, waste liquid all is sent to pre-rectifying tower and makes extraction water at the bottom of the tower.
Specify as follows:
1) atmospheric tower side line extraction steam enters recovery tower.
The steam material of atmospheric tower side line extraction intermediate concentration, after cooling (can be used for the thick methyl alcohol of preheating), enter recovery tower in a high position, improve the input concentration of recovery tower like this by static pressure difference, make three tower separation degree equilibriums, can make total energy consumption reduce by 20～40% than common economic benefits and social benefits rectification process.Simultaneously, because the position of side line extraction mouth than opening for feed position height, can make a large amount of salt and the excess base that produce in the pre-rectifying tower concentrate at the bottom of the normal pressure Tata like this.
2) extraction contains alkali salt solution at the bottom of the normal pressure Tata.
Extraction contains alkali salt solution at the bottom of the normal pressure Tata, avoids carrying it into recovery tower, thereby liquid becomes the soft water that does not contain saline and alkaline composition at the bottom of making the recovery Tata.
3) recovery tower side line extraction potato spirit.
Recovery tower side line extraction potato spirit, can improve the quality of methanol product, and the enrichment concentration of the interior high boiling product of reduction tower, in conjunction with 1) technology in the bar, can make and reclaim that the water concentration in the liquid reaches 99.9% at the bottom of the Tata, be enough to as the pre-rectifying tower extraction water, it is about 20～40% so both can to have saved soft water, can reduce the wastewater discharge of total system again.In addition, the extraction rate of side line extraction potato spirit is very high, and methyl alcohol loses seldom.
4) reclaim also extraction refined methanol product of cat head.
Except from pressurizing tower, atmospheric tower cat head extraction product, also from recovery tower cat head extraction refined methanol product, like this can be by each tower product produced quantity segregational load between rational and effective balance pressurizing tower, atmospheric tower and the recovery tower more.
5) effluent discharge can be used as the extraction water of pre-rectifying tower at the bottom of the recovery tower.
The add-on of the extraction water of pre-rectifying tower be thick methanol feeding amount 5%～20% or quantitatively control according to specified phegma density or prognosis methyl alcohol density, be circulated back to pre-rectifying tower instead of part extraction water with the effluent discharge of recovery tower ground, can save fresh extraction water 20～60%, effectively reduce cost.
The energy-conservation major equipment of double effect rectification for methanol of the present invention is identical with common double-effect rectification equipment, so when existing double effect rectification for methanol equipment being transformed according to this invention, need not add any equipment, as long as the mode of connection of original equipment component is changed, but this technology has reduced the rectifying energy consumption widely, and saved the extraction water, thereby improved the economic benefit of rectifying.
Description of drawings
Fig. 1: existing double-effect rectification process flow diagram;
Fig. 2: process flow diagram of the present invention.
Wherein: the 1-pre-rectifying tower, the 2-pressurizing tower, the 3-atmospheric tower, the 4-recovery tower, 5-1-pre-rectifying tower return tank, 5-2-pressurizing tower return tank, 5-3-atmospheric tower return tank, 5-4-recovery tower return tank, 6-1-pre-rectifying tower secondary condenser, 6-2-pre-rectifying tower-level condenser, 6-3-atmospheric tower condenser, 6-4-recovery tower condenser, 7-1-pre-rectifying tower reboiler, 7-2-pressurizing tower reboiler, 7-3-recovery tower reboiler, 8-condensation reboiler, 9-1-pre-rectifying tower reflux pump, 9-2-pressurizing tower reflux pump, 9-3-atmospheric tower reflux pump, 9-4-recovery tower reflux pump, 10-1-pressurizing tower refined methanol water cooler, 10-2-recovery tower feed cooler, the 11-preheater.
Embodiment
The energy-conservation major equipment of double effect rectification for methanol of the present invention is identical with common double-effect rectification equipment, specifically comprises: thick methanol preheater, pre-rectifying tower, prognosis methyl alcohol well heater, pressurizing tower, atmospheric tower, reboiler, condensation reboiler and methanol distillation column etc.Wherein each equipment also existing apparatus mode of connection difference be:
1) atmospheric tower side line extraction pipe is connected with water cooler, and water cooler is connected with the recovery tower opening for feed again;
2) connection contains alkali salt solution extraction pipe at the bottom of the atmospheric tower;
3) the recovery tower side line connects potato spirit extraction pipe;
4) the extraction water pipe coupling of waste liquid vent pipe at the bottom of the tower and pre-rectifying tower.
Remaining equipment connection mode and existing technology are basic identical, as: discharge nozzle is connected with the opening for feed of pressurizing tower at the bottom of the tower of pre-rectifying tower, discharge nozzle is connected with the atmospheric tower opening for feed at the bottom of the pressurizing tower: the outlet of pressurization cat head methanol steam is connected with the condensation reboiler of atmospheric tower, and vapour condensation liquid pipe is connected with the pressurizing tower return tank; The vapor condensation water pipe of the reboiler of pre-rectifying tower, pressurizing tower and recovery tower all is connected with the preheater of thick methyl alcohol etc.
Be described further below in conjunction with 2 pairs of technical process of the present invention of accompanying drawing:
1) thick methyl alcohol is after feed preheater 11 and each tower reboiler steam water of condensation heat exchange, with about 60-70 ℃ enter pre-rectifying tower 1 middle and upper part.Pre-rectifying tower top steam is partial condensation in pre-rectifying tower first-stage condenser 6-2, and this condenser temperature is controlled at 60-70 ℃.The first-stage condenser noncondensable gas enters pre-rectifying tower secondary condenser 6-1 and is cooled to 38-40 ℃, and the secondary condenser non-condensable gas send makes fuel, and lime set is through first-stage condenser pre-rectifying tower return tank 5-1, and 9-1 returns to cat head by the pre-rectifying tower reflux pump.In secondary condenser or first-stage condenser or in two condensing reflux jars, add the technology extraction water simultaneously, can be aperiodically adopt exit extraction starting fraction from the secondary condenser return tank.The add-on of technology extraction water be thick methanol feeding amount 5%～20% or quantitatively control according to specified phegma density or prognosis methyl alcohol density.It is 50%～70% of thick methanol feeding amount that pre-rectifying tower pushes up total quantity of reflux.Establish the NaOH aqueous solution in the middle and lower part of this tower and add inlet, the temperature of balance prognosis methyl alcohol is 125-130 ℃, and pH value is controlled at 7～9.
2) prognosis methyl alcohol is as pressurizing tower 2 chargings.The methanol steam temperature of pressurizing tower cat head is about 120-123 ℃, send into the atmospheric tower condenser and boil 8 again as its thermal source, temperature is that 118-120 ℃ phlegma flows into pressurizing tower return tank 5-2, wherein partial condensation liquid is through the phegma of pressurizing tower reflux pump 9-2 as this tower, in addition a part after pressurizing tower refined methanol water cooler 10-1 is cooled to 38-42 ℃ as the extraction of refined methanol product.
3) liquid enters atmospheric tower 3 at the bottom of the pressurization Tata.Atmospheric Tower steam is through atmospheric tower condenser 6-3 condensation, and lime set is through atmospheric tower return tank 5-3, and part is sent cat head as phegma back to by atmospheric tower reflux pump 9-3, and rest part is as the refined methanol product.Atmospheric tower phegma temperature is controlled at 40～60 ℃, and control of reflux ratio is 1.5～2.5.Extraction contains alkali salt solution at the bottom of the atmospheric tower, avoids carrying it into recovery tower 4.
4) from the side line extraction steam material of one, two block of plate more than the feed plate of pressurizing tower middle part, behind recovery tower feed cooler 10-2, flow into recovery tower by static pressure difference.Methanol Recovery cat head product is after recovery tower condenser 6-4 condensation, and lime set is through recovery tower return tank 5-4, and wherein 30%～70% lime set is sent to the recovery cat head by recovery tower reflux pump 9-4, can be used as the refined methanol product in addition.The potato spirit of recovery tower bottom side line extraction 0.5-2% had both improved the quality of methanol product, make tower again at the bottom of discharging be essentially soft water, be sent to pre-rectifying tower and make extraction water.
5) the reboiler 7-3 of heating steam by pre-rectifying tower reboiler 7-1, pressurizing tower reboiler 7-2 and recovery tower is respectively it provides heat.
Double-efficient energy-saving methanol rectifying apparatus and method that the present invention proposes, be described by preferred embodiment, person skilled obviously can be in not breaking away from content of the present invention, spirit and scope to structure as herein described with the preparation method changes or suitably change and combination, realize the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (2)
1. a double effect rectification for methanol energy-saving and water-saving system comprises: thick methanol preheater, pre-rectifying tower, prognosis methyl alcohol well heater, pressurizing tower, atmospheric tower, reboiler, condensation reboiler and methanol distillation column; It is characterized in that atmospheric tower side line extraction pipe is connected with water cooler, water cooler is connected with the recovery tower opening for feed again; Connect at the bottom of the atmospheric tower and contain alkali salt solution extraction pipe; The recovery tower side line connects potato spirit extraction pipe; The waste liquid vent pipe at the bottom of the recovery Tata and the extraction water pipe coupling of pre-rectifying tower.
2. the technology of a kind of double effect rectification for methanol energy-saving and water-saving as claimed in claim 1 system, concrete processing condition are as follows: the extraction water temperature that enters the pre-rectifying tower middle and upper part is 65～70 ℃; The temperature of balance prognosis methyl alcohol is 125～130 ℃, and pH value is 7～9; The methanol steam temperature of pressurizing tower cat head is 120～123 ℃, with condensate temperature after the condenser heat exchange of boiling again be 118～120 ℃; From pressurizing tower middle part side line extraction steam material, behind water cooler, flow into recovery tower by static pressure difference; The potato spirit of recovery tower bottom side line extraction 0.5～2%, the waste liquid at the bottom of the recovery Tata all is sent to pre-rectifying tower and makes extraction water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100132699A CN1328232C (en) | 2006-03-10 | 2006-03-10 | Double-efficient energy-saving and water-saving rectifying system and process for methanol |
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| CNB2006100132699A CN1328232C (en) | 2006-03-10 | 2006-03-10 | Double-efficient energy-saving and water-saving rectifying system and process for methanol |
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| CN1817836A CN1817836A (en) | 2006-08-16 |
| CN1328232C true CN1328232C (en) | 2007-07-25 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101607869B (en) * | 2009-07-21 | 2012-12-26 | 天津大学 | Methanol double-effect rectification high-elasticity combined technique and system therefor |
| CN102992951B (en) * | 2012-12-20 | 2015-06-24 | 湖南宜化化工有限责任公司 | Method for preparing high-purity refined methanol by three-tower rectification |
| CN106075947A (en) * | 2016-06-03 | 2016-11-09 | 天津大学 | Methanol four tower double-effect heat pump energy-saving equipment and method |
| CN107285996A (en) * | 2017-06-20 | 2017-10-24 | 天津渤化永利化工股份有限公司 | A kind of method and device of high efficiente callback methanol rectification waste liquid |
| CN108558603B (en) * | 2018-06-06 | 2021-08-03 | 天津奥展兴达化工技术有限公司 | Three-tower three-effect crude methanol refining process method |
| CN109260748A (en) * | 2018-11-26 | 2019-01-25 | 宁夏北控睿源再生资源有限公司 | A kind of useless methanol production recyclable device and method |
| CN109627145A (en) * | 2019-01-29 | 2019-04-16 | 浙江先锋科技股份有限公司 | A kind of high-efficiency low energy consumption sodium methoxide equipment for purifying |
| CN110143850A (en) * | 2019-05-28 | 2019-08-20 | 天津大学 | The not energy-saving methanol multi-effect distillation method of the single column steam drive of by-product fusel oil |
| CN110327647B (en) * | 2019-07-19 | 2021-12-10 | 张兵 | Improved three-tower three-effect crude methanol refining process method |
| CN110483249A (en) * | 2019-08-14 | 2019-11-22 | 天津大学 | A kind of six tower quadruple effect rectificating method of single column steam drive type methanol of not by-product fusel oil |
| CN114716303A (en) * | 2022-04-21 | 2022-07-08 | 湖北泰盛化工有限公司 | Method and device for recovering methanol in industrial glycine production |
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| US4744869A (en) * | 1985-08-16 | 1988-05-17 | Mitsubishi Gas Chemical Company, Inc. | Process for purifying methanol |
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| CN1600762A (en) * | 2003-09-23 | 2005-03-30 | 上海焦化有限公司 | Method for preparing methyl alcohol in high purity |
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2006
- 2006-03-10 CN CNB2006100132699A patent/CN1328232C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4744869A (en) * | 1985-08-16 | 1988-05-17 | Mitsubishi Gas Chemical Company, Inc. | Process for purifying methanol |
| CN1438208A (en) * | 2003-03-18 | 2003-08-27 | 范希中 | Methanol fine-distillation technology and fine-distillation apparatus |
| CN1600762A (en) * | 2003-09-23 | 2005-03-30 | 上海焦化有限公司 | Method for preparing methyl alcohol in high purity |
Non-Patent Citations (1)
| Title |
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| 甲醇精馏工艺及装置 贾民选，科技情报开发与经济，第15卷第18期 2005 * |
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Application publication date: 20060816 Assignee: Guangzhou Cheng Heng Chemical Co., Ltd. Assignor: Tianjin University Contract record no.: 2012440000498 Denomination of invention: Double-efficient energy-saving and water-saving rectifying system and process for methanol Granted publication date: 20070725 License type: Exclusive License Record date: 20120814 |
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Granted publication date: 20070725 Termination date: 20210310 |
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