CN203461845U - Combined tower for recycling methanol and evaporating process water - Google Patents

Combined tower for recycling methanol and evaporating process water Download PDF

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Publication number
CN203461845U
CN203461845U CN201320500592.4U CN201320500592U CN203461845U CN 203461845 U CN203461845 U CN 203461845U CN 201320500592 U CN201320500592 U CN 201320500592U CN 203461845 U CN203461845 U CN 203461845U
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China
Prior art keywords
tower
methanol
combined
combined tower
water
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Expired - Lifetime
Application number
CN201320500592.4U
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Chinese (zh)
Inventor
刘学线
巩传志
张木兰
杨素珍
郭晓宇
李长富
王艳红
王伟东
杨晓光
王清媛
赵冰
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Petrochina Jilin Chemical Engineering Co ltd
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Jilin Design Institute
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Priority to CN201320500592.4U priority Critical patent/CN203461845U/en
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Publication of CN203461845U publication Critical patent/CN203461845U/en
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Abstract

The utility model relates to chemical equipment and provides a combined tower for recycling methanol and evaporating process water. The combined tower comprises a condensing cooler. The combined tower is characterized in that water containing the methanol and the process water enter from the middle part of the combined tower; the methanol is discharged from the top of the combined tower and is recycled; the waste water is discharged from the bottom of the combined tower; process diluted steam is discharged from the middle of the combined tower and is returned to a reactor; a tower top reflowing device is arranged at the top of the combined tower and reflowing liquid is the methanol from a reflowing tank; a plate type tower structure is arranged on the lower part of the combined tower and a packed tower structure is arranged on the upper part of the combined tower. The combined tower for recycling the methanol and evaporating the process water has the advantages that by virtue of high evaporation capacity for producing process steam, the concentration of the methanol in the waste water from the bottom of a methanol recycling tower can be reduced to be lower than 1PPm and the emission of the ethanol can be reduced; the combined tower has obvious economic benefits and environmental benefits; another improvement is that the problem that a tower bottom reboiler is blocked by deposited dirt because the waste water concentration multiple of a tower kettle of an independently-arranged process steam tower is too high is avoided and the operation period of the equipment is prolonged.

Description

A kind of Methanol Recovery, process water evaporation combined column
Technical field
The utility model relates to a kind of chemical industry equipment, more particularly, relates to the equipment of the recovery methyl alcohol in a kind of preparing propylene from methanol.
Background technology
Preparing propylene from methanol (MTP) technique is to take methyl alcohol as raw material, by series reaction processes such as intermolecular dehydration, methanations, generates and take propylene as main hydrocarbon products.Preparing propylene from methanol reaction process is the gas phase catalytic reaction of heat release, and reaction product is finally cooled in quench tower, and unreacted methyl alcohol is cooling and absorption by process water, and part heavy hydrocarbon and coke impurity that simultaneous reactions generates also can enter into process water.
As take between methanol molecules dehydration, to generate low charcoal alkene be main reaction process, and the water of generation finally need to be discharged from system.For meeting environmental requirement, reclaim unreacted methanol feedstock simultaneously, need this process water rectification process to reclaim methyl alcohol.
Preparing propylene from methanol (MTP) reaction needed adds Macrodilution steam to control speed of response, remove reaction heat and to reduce hydrocarbon partial pressure to reduce coking in feeding gas.This dilution steam generation is generally produced by process water evaporation, and evaporation heat is provided by the reboiler indirect heating being arranged at the bottom of process steam tower by live steam.
Conventionally, methanol distillation column and process steam tower are independent settings respectively.
In common process, be subject to separation efficiency and power consumption limitations, in the processing wastewater of methanol distillation column tower reactor discharge, methanol content is still higher, reach 800~1000PPm, not only cause the waste of methyl alcohol resource, and owing to not reaching environmental protection standard, still need further biochemical treatment.
For process steam tower, because process water steam output is large, tower reactor liquid cycles of concentration is high, causes process steam tower reboiler often because of fouling, to stop up, and affects device long-period stable operation.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of prior art, and the device of the recovery methyl alcohol in a kind of ethylene oxide device is provided.
The utility model and from preparing propylene from methanol (MTP) containing the method that efficiently removes, reclaims methyl alcohol the methanol technics aqueous solution, generating process steam simultaneously.After needs are processed discharge with for generating process steam together with methanol technics water, send into Methanol Recovery/process steam tower, by this column overhead, reclaim and obtain methyl alcohol, tower stripping section side line caterpillar process steam.By process steam tower and methanol distillation column are integrated, by the high evaporation amount that produces process steam, the methanol content in waste discharge at the bottom of tower is reduced to below 1PPm; By the high extracted amount of methanol distillation column tower reactor processing wastewater, tower reactor water is remained on compared with clean conditions, solved the problem that tower bottom reboiler stops up.
The utility model provides a kind of method that efficiently removes, reclaims methyl alcohol from MTP device waste water, has solved the problem that in common process, process steam tower reboiler stops up simultaneously.
It is Methanol Recovery/process steam tower that the utility model effectively integrates process steam tower and methanol distillation column, the function that makes it possess generating process steam simultaneously and reclaim methyl alcohol.Methanol distillation column bottom side line after merging is drawn process steam, the temperature of tower top is 85~145 ℃, the recovery methyl alcohol that overhead extraction is qualified, the problem of having avoided process steam tower reactor to cause reboiler to stop up because Waste water concentrating multiple is too high, by the high evaporation amount of generating process steam, make methanol content in waste discharge be less than 1PPm simultaneously.
Working pressure scope is 0.6~1.8MPaA, preferred operations pressure 0.8~1.2MPaA, and column internals is structured packing or column plate, can be also the combination of structured packing and column plate.
A kind of Methanol Recovery, process water evaporation combined column, comprise condensate cooler, it is characterized in that, containing methyl alcohol and process water, by combined column middle part, entered, methyl alcohol is discharged by combined column top, recycle, waste water is discharged by the bottom of combined column, and technique dilution steam generation is discharged by combined column middle part, Returning reactor, combined column top is provided with trim the top of column, and phegma is methyl alcohol, comes to return tank; The bottom of combined column is tray column structure, and the top of combined column is packing tower structure.
The utility model has the advantage of, by the high evaporation amount that produces process steam, can make the methanol concentration in waste water at the bottom of methanol distillation column be reduced to below 1PPm, the MTP device of 600,000 tons/year of take is example, can reduce 1100 tons/year of methyl alcohol discharges, there is significant economic benefit and environmental benefit; Another improvements are, have avoided the process steam tower of independent setting too high because of tower reactor Waste water concentrating multiple, and the problem that causes tower bottom reboiler dirt deposition to stop up, has extended the equipment cycle of operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of combined column of the present utility model.
In figure, there are Methanol Recovery, process water evaporation combined column 1, reboiler 2, water cooler 3, return tank 4, reflux pump 5.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is made a further detailed description.
The utility model relates to the method that efficiently removes, reclaims methyl alcohol the methanol technics aqueous solution that contains from preparing propylene from methanol (MTP), simultaneously generating process steam.
Evaporate the supporting equipment of combined column with Methanol Recovery, process water, have reboiler, water cooler, return tank, reflux pump.
Have containing methyl alcohol and process water and entered by combined column middle part, methyl alcohol is discharged by combined column top, recycles, waste water is discharged by the bottom of combined column, and technique dilution steam generation is discharged by combined column middle part, Returning reactor, combined column top is provided with trim the top of column, and phegma is methyl alcohol, comes to return tank; The bottom of combined column is tray column structure, and the top of combined column is packing tower structure.
After needs are processed discharge with for generating process steam together with methanol technics water, send into Methanol Recovery/process steam tower, by this column overhead, reclaim and obtain methyl alcohol, tower stripping section side line caterpillar process steam.By process steam tower and methanol distillation column are integrated, by the high evaporation amount that produces process steam, the methanol content in waste discharge at the bottom of tower is reduced to below 1PPm; Working pressure scope is 0.6~1.8MPaA, preferred operations pressure 0.8~1.2MPaA, the temperature of tower top is 85~145 ℃, high extracted amount by methanol distillation column tower reactor processing wastewater, tower reactor water is remained on compared with clean conditions, solve the problem that tower bottom reboiler stops up, solve the technique of high efficiente callback methyl alcohol in the process water in preparing propylene from methanol device

Claims (1)

1. a Methanol Recovery, process water evaporate combined column, comprise condensate cooler, it is characterized in that, containing methyl alcohol and process water, by combined column middle part, entered, methyl alcohol is discharged by combined column top, recycle, waste water is discharged by the bottom of combined column, and technique dilution steam generation is discharged by combined column middle part, Returning reactor, combined column top is provided with trim the top of column, and phegma is methyl alcohol, comes to return tank; The bottom of combined column is tray column structure, and the top of combined column is packing tower structure.
CN201320500592.4U 2013-08-07 2013-08-07 Combined tower for recycling methanol and evaporating process water Expired - Lifetime CN203461845U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320500592.4U CN203461845U (en) 2013-08-07 2013-08-07 Combined tower for recycling methanol and evaporating process water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320500592.4U CN203461845U (en) 2013-08-07 2013-08-07 Combined tower for recycling methanol and evaporating process water

Publications (1)

Publication Number Publication Date
CN203461845U true CN203461845U (en) 2014-03-05

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CN201320500592.4U Expired - Lifetime CN203461845U (en) 2013-08-07 2013-08-07 Combined tower for recycling methanol and evaporating process water

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104098214A (en) * 2014-07-28 2014-10-15 神华集团有限责任公司 Catalyst waste water treatment system
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104098214A (en) * 2014-07-28 2014-10-15 神华集团有限责任公司 Catalyst waste water treatment system
CN104098214B (en) * 2014-07-28 2016-02-10 神华集团有限责任公司 Containing wastewater from catalyst treatment system
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

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Effective date of registration: 20201012

Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province

Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd.

Address before: 132001 Jilin District of Changyi province Tong Tan Road Jihua Trade Center building A

Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd.

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Granted publication date: 20140305

CX01 Expiry of patent term