CN111085085A - Methyl cellulose ether tail gas recovery device and method - Google Patents
Methyl cellulose ether tail gas recovery device and method Download PDFInfo
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- CN111085085A CN111085085A CN201911256511.9A CN201911256511A CN111085085A CN 111085085 A CN111085085 A CN 111085085A CN 201911256511 A CN201911256511 A CN 201911256511A CN 111085085 A CN111085085 A CN 111085085A
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- alcohol
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
Abstract
The invention discloses a methyl cellulose ether tail gas recovery device and a method, wherein the device comprises: a tail gas input pipeline, an alcohol absorption tower, an alcohol storage tank, an alcohol circulating pump, a water absorption tower, a water storage tank and a water circulating pump; the tail gas input pipeline is connected with the alcohol absorption tower and is used for inputting methyl cellulose ether tail gas into the alcohol absorption tower, the alcohol absorption tower is connected with the alcohol storage tank and the alcohol circulating pump, alcohol stored in the alcohol storage tank enters the alcohol absorption tower under the action of the alcohol circulating pump, and alcohol solution after tail gas absorption in the alcohol absorption tower returns to the alcohol storage tank; the water absorption tower is connected with the alcohol absorption tower, the tail gas enters the water absorption tower after being absorbed by the alcohol absorption tower, the water absorption tower is connected with the water storage tank and the water circulating pump, the water stored in the water storage tank enters the water absorption tower under the action of the water circulating pump, and the water solution after the tail gas absorption in the water absorption tower returns to the water storage tank. The invention can realize the recycling of tail gas, meets the requirement of clean production and has lower operation cost.
Description
Technical Field
The invention belongs to the field of fine chemical production, relates to tail gas recovery of methyl cellulose ether, and particularly relates to a methyl cellulose ether tail gas recovery device and method.
Background
The production process of domestic methyl cellulose ether and derivatives thereof generally uses toluene and isopropanol as solvents, and the main components in tail gas are also toluene and isopropanol.
The common treatment methods for the tail gas include an adsorption method, a condensation method and a combustion method. The adsorption method is a method of separating by utilizing the difference of the acting force between the adsorbent and each component molecule in the exhaust gas, and generally adopts the adsorbent such as activated carbon to carry out adsorption separation, but the adsorption separation method has poor treatment effect on the exhaust gas with high flux and high concentration. The condensation method is to separate the components in the mixed gas by utilizing the gas-liquid equilibrium difference of the components at different temperatures and different pressures, generally adopts a method of reducing the temperature or increasing the pressure, and has higher operation cost. The combustion method has mature process and high treatment efficiency, but can not recycle raw materials, and has higher construction cost and operation cost.
Disclosure of Invention
The invention aims to provide a methyl cellulose ether tail gas recovery device and a methyl cellulose ether tail gas recovery method, which can realize the recovery and the reutilization of tail gas, meet the requirement of clean production and have lower operation cost.
In order to achieve the above object, the present invention provides a methyl cellulose ether tail gas recovery device, comprising: a tail gas input pipeline, an alcohol absorption tower, an alcohol storage tank, an alcohol circulating pump, a water absorption tower, a water storage tank and a water circulating pump; the tail gas input pipeline is connected with an alcohol absorption tower and is used for inputting the methyl cellulose ether tail gas into the alcohol absorption tower, the alcohol absorption tower is connected with the alcohol storage tank and the alcohol circulating pump, alcohol stored in the alcohol storage tank enters the alcohol absorption tower under the action of the alcohol circulating pump, and alcohol solution after tail gas absorption in the alcohol absorption tower returns to the alcohol storage tank; the water absorption tower is connected with the alcohol absorption tower, tail gas enters the water absorption tower after being absorbed by the alcohol absorption tower, the water absorption tower is connected with the water storage tank and the water circulating pump, water stored in the water storage tank enters the water absorption tower under the action of the water circulating pump, and water solution after the tail gas is absorbed in the water absorption tower returns to the water storage tank.
Preferably, the alcohol absorption tower further comprises a buffer tank, wherein the buffer tank is arranged between the tail gas input pipeline and the alcohol absorption tower and is used for carrying out buffer adjustment on the flow rate and the flow speed of the tail gas.
Preferably, the tail gas treatment system further comprises a pressure transmitter, wherein the pressure transmitter is arranged on the tail gas input pipeline, is connected with the alcohol circulating pump and the water circulating pump and is used for starting the alcohol circulating pump and the water circulating pump in an interlocking mode.
Preferably, a refrigerator is further included, the refrigerator being disposed between the alcohol circulation pump and the alcohol absorption tower and between the water circulation pump and the water absorption tower, for reducing the temperature of the alcohol and the water as the absorbent.
Preferably, the system further comprises an activated carbon adsorption tower, wherein the activated carbon adsorption tower is connected with the water absorption tower and is used for further absorbing the tail gas absorbed by the water absorption tower and discharging the tail gas outwards.
Preferably, the alcohol is isopropanol.
Preferably, the alcohol absorption tower and the water absorption tower are packed towers, and the flow mode of gas and liquid phases of the packed towers is a countercurrent absorption mode.
Preferably, the alcohol reservoir is connected to a solvent system used in the production of methyl cellulose ether, and the alcohol solution exchanged from the alcohol reservoir enters the solvent system for reuse.
Preferably, the water storage tank is connected with a distillation system, and the water solution exchanged from the water storage tank enters the distillation system for alcohol recovery.
The invention also provides a methyl cellulose ether tail gas recovery method, which is used for recovering the methyl cellulose ether tail gas by using the methyl cellulose ether tail gas recovery device.
The methyl cellulose ether tail gas recovery device and method provided by the invention can realize the recovery and reutilization of tail gas, meet the requirement of clean production and have lower operation cost.
Drawings
Fig. 1 is a schematic structural diagram of a methyl cellulose ether tail gas recovery device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
The methyl cellulose ether tail gas recovery device provided by the invention adopts an absorption method to recover tail gas in the production process of methyl cellulose ether and derivatives thereof. The production process of domestic methyl cellulose ether and derivatives thereof generally uses toluene and isopropanol as solvents, and the main components in tail gas are also toluene and isopropanol. The present embodiment is carried out by a two-stage combined absorption, i.e., one-stage alcohol absorption and one-stage water absorption. The alcohol absorption is mainly used for absorbing toluene in the tail gas, and the water absorption is mainly used for absorbing isopropanol in the tail gas. The alcohol used in the present embodiment is selected from the alcohols used in the solvents used in the actual production of the methyl cellulose ethers and derivatives thereof, and is typically isopropyl alcohol. The toluene is basically and completely absorbed after the first-stage alcohol absorption, the residual main component in the tail gas is isopropanol, and the isopropanol is basically and completely absorbed after the second-stage water absorption.
Fig. 1 is a schematic structural diagram of a methyl cellulose ether tail gas recovery device according to an embodiment of the present invention. As shown in fig. 1, the methyl cellulose ether off-gas recovery apparatus of the present embodiment includes: alcohol absorption tower 2, water absorption tower 3, alcohol storage tank 5, alcohol circulating pump 6, water storage tank 7, water circulating pump 8, tail gas input pipeline 11. Wherein, the tail gas input pipeline 11 is connected with the alcohol absorption tower 2 and is used for inputting methyl cellulose ether tail gas into the alcohol absorption tower 2, the alcohol absorption tower 2 is connected with the alcohol storage tank 5 and the alcohol circulating pump 6, alcohol stored in the alcohol storage tank 5 enters the alcohol absorption tower 2 under the action of the alcohol circulating pump 6, and alcohol solution after tail gas absorption in the alcohol absorption tower 2 returns to the alcohol storage tank 5; the water absorption tower 3 is connected with the alcohol absorption tower 2, the tail gas enters the water absorption tower 3 after being absorbed by the alcohol absorption tower 2, the water absorption tower 3 is connected with the water storage tank 7 and the water circulating pump 8, the water stored in the water storage tank 7 enters the water absorption tower 3 under the action of the water circulating pump 8, and the water solution after the tail gas absorption in the water absorption tower 3 returns to the water storage tank 7.
In addition, the methyl cellulose ether tail gas recovery device of the present embodiment may further include a buffer tank 1, a pressure transmitter 9, a refrigerator 10, and an activated carbon adsorption tower 4. The buffer tank 1 is arranged between the tail gas input pipeline 11 and the alcohol absorption tower 2 and is used for buffering and adjusting the flow rate and the flow speed of the tail gas. Pressure transmitter 9 sets up in tail gas input pipeline 11, is connected with alcohol circulating pump 6 and water circulating pump 8 for interlock start alcohol circulating pump 6 and water circulating pump 8. Refrigerators 10 are provided between the alcohol circulation pump 6 and the alcohol absorption tower 2 and between the water circulation pump 8 and the water absorption tower 3, for reducing the temperatures of alcohol and water as absorbents. The activated carbon adsorption tower 4 is connected with the water absorption tower 3 and is used for further absorbing the tail gas absorbed by the water absorption tower 3 and discharging the tail gas outwards.
Methyl cellulose ether tail gas enters a buffer tank 1 through a tail gas input pipeline 11, and the buffer tank 1 plays a role in buffering and regulating the flow rate and the flow speed of the tail gas; meanwhile, when tail gas enters the buffer tank 1 through the tail gas input pipeline 11, the pressure transmitter 9 can detect a pressure signal, and the alcohol circulating pump 6 and the water circulating pump 8 are started in parallel in a locked mode to respectively spray alcohol and water into the alcohol absorption tower 2 and the water absorption tower 3; tail gas enters an alcohol absorption tower 2 through a buffer tank 1 along a pipeline, the alcohol absorption tower 2 mainly absorbs toluene components in the tail gas by using alcohol (preferably isopropanol), the type of the absorption tower is preferably a filler tower, the compatibility of the filler material and the tail gas components needs to be considered, and the flow mode of gas phase and liquid phase is preferably a countercurrent absorption mode; the alcohol solution after the absorption is returned to the alcohol storage tank 5, and the alcohol storage tank 5 is used for storing an absorbent for absorbing the toluene component in the tail gas and has a closed structure.
The toluene is almost completely absorbed after the tail gas is absorbed by the alcohol absorption tower 2, but alcohols with small molecular weight, such as isopropanol, have strong volatility, and the tail gas still contains isopropanol with certain concentration, and the isopropanol is absorbed by using a water absorption mode. Therefore, the tail gas is absorbed by the alcohol absorption tower 2 and then continuously enters the water absorption tower 3 along the pipeline, the water absorption tower 3 mainly uses water to absorb the alcohols in the tail gas, the type of the absorption tower is preferably a packed tower, the material of the packing needs to consider the compatibility with the components of the tail gas, and the flow mode of the gas phase and the liquid phase is preferably a countercurrent absorption mode; the water solution after the absorption is returned to the water storage tank 7, and the water storage tank 7 is used for storing the absorbent used for absorbing the alcohol component in the tail gas and has a closed structure.
After the tail gas is absorbed by the alcohol absorption tower 2 and the water absorption tower 3, the main components of toluene and isopropanol are basically and completely absorbed, and trace residual components enter the activated carbon adsorption tower 4 along a pipeline for further adsorption treatment; the refrigerator 10 is used to lower the temperature of water and alcohol as an absorbent to thereby improve absorption efficiency, and the temperature of the absorbent after being cooled by the refrigerator is preferably 5 ℃. The buffer tank 1, the alcohol absorption tower 2, the water absorption tower 3, the activated carbon adsorption tower 4, the alcohol storage tank 5, the alcohol circulating pump 6, the water storage tank 7 and the water circulating pump 8 are all connected by pipelines and flanges.
When the toluene absorbed by the alcohol in the alcohol storage tank 5 exceeds a certain value (preferably 10%), the alcohol solution in the alcohol storage tank 5 is replaced, and the replaced alcohol solution can directly enter a solvent system used for methyl cellulose ether production or can enter a rectification system for separating toluene and alcohol and then be recycled. When the alcohol content in the water storage tank 7 exceeds a certain value (preferably 5%), the water solution in the water storage tank is replaced, and the replaced water solution enters a distillation system for alcohol recovery.
In addition, the embodiment of the invention also provides a methyl cellulose ether tail gas recovery method, which utilizes the methyl cellulose ether tail gas recovery device to recover tail gas.
According to the technical scheme of the embodiment of the invention, methyl cellulose ether tail gas (toluene and isopropanol) is subjected to a primary alcohol absorption tower 2, the toluene is basically and completely absorbed, the remaining main component in the tail gas is isopropanol, the isopropanol is basically and completely absorbed after being absorbed by a secondary water absorption tower 3, and trace residual toluene and isopropanol can be absorbed by an activated carbon absorption tower 4, so that the tail gas can be discharged up to the standard. Further, the first-stage absorbent used in the present embodiment can be used as a solvent for producing methyl cellulose ether without desorption (the operation of releasing gas dissolved in a liquid phase is called desorption, and desorption is the reverse process of absorption), can realize recovery and reuse of off-gas, satisfies the requirement for clean production, and has a low running cost.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (10)
1. The methyl cellulose ether tail gas recovery device is characterized by comprising: a tail gas input pipeline, an alcohol absorption tower, an alcohol storage tank, an alcohol circulating pump, a water absorption tower, a water storage tank and a water circulating pump;
the tail gas input pipeline is connected with an alcohol absorption tower and is used for inputting the methyl cellulose ether tail gas into the alcohol absorption tower, the alcohol absorption tower is connected with the alcohol storage tank and the alcohol circulating pump, alcohol stored in the alcohol storage tank enters the alcohol absorption tower under the action of the alcohol circulating pump, and alcohol solution after tail gas absorption in the alcohol absorption tower returns to the alcohol storage tank;
the water absorption tower is connected with the alcohol absorption tower, tail gas enters the water absorption tower after being absorbed by the alcohol absorption tower, the water absorption tower is connected with the water storage tank and the water circulating pump, water stored in the water storage tank enters the water absorption tower under the action of the water circulating pump, and water solution after the tail gas is absorbed in the water absorption tower returns to the water storage tank.
2. The methyl cellulose ether tail gas recovery device of claim 1, further comprising a buffer tank disposed between the tail gas input conduit and the alcohol absorption column for buffer regulation of tail gas flow and flow rate.
3. The methyl cellulose ether tail gas recovery device of claim 1 or 2, further comprising a pressure transmitter disposed on the tail gas input pipeline and connected to the alcohol circulation pump and the water circulation pump for interlockingly activating the alcohol circulation pump and the water circulation pump.
4. The methyl cellulose ether tail gas recovery device of any one of claims 1-3, further comprising a refrigerator disposed between the alcohol circulation pump and the alcohol absorption column and between the water circulation pump and the water absorption column for reducing the temperature of alcohol and water as absorbents.
5. The methyl cellulose ether tail gas recovery device according to any one of claims 1 to 4, further comprising an activated carbon adsorption tower, wherein the activated carbon adsorption tower is connected with the water absorption tower and is used for further absorbing the tail gas absorbed by the water absorption tower and discharging the tail gas to the outside.
6. The methyl cellulose ether tail gas recovery device of any one of claims 1-5, wherein the alcohol is isopropanol.
7. The methyl cellulose ether tail gas recovery device according to any one of claims 1 to 6, wherein the alcohol absorption tower and the water absorption tower are packed towers, and the flow mode of the gas phase and the liquid phase of the packed towers is a countercurrent absorption mode.
8. The methyl cellulose ether tail gas recovery device of any one of claims 1-7, wherein the alcohol storage tank is connected to a solvent system used in methyl cellulose ether production, and the alcohol solution exchanged from the alcohol storage tank enters the solvent system for reuse.
9. The methyl cellulose ether tail gas recovery device of any one of claims 1-8, wherein the water storage tank is connected to a distillation system, and the aqueous solution exchanged from the water storage tank enters the distillation system for alcohol recovery.
10. A methyl cellulose ether tail gas recovery method, which is characterized in that the methyl cellulose ether tail gas recovery device of any one of claims 1 to 9 is used for recovering methyl cellulose ether tail gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911256511.9A CN111085085A (en) | 2019-12-10 | 2019-12-10 | Methyl cellulose ether tail gas recovery device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911256511.9A CN111085085A (en) | 2019-12-10 | 2019-12-10 | Methyl cellulose ether tail gas recovery device and method |
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| CN111085085A true CN111085085A (en) | 2020-05-01 |
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| CN201911256511.9A Pending CN111085085A (en) | 2019-12-10 | 2019-12-10 | Methyl cellulose ether tail gas recovery device and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206350977U (en) * | 2016-12-14 | 2017-07-25 | 威海拓展纤维有限公司 | Waste gas recovery processing unit |
| CN207254050U (en) * | 2017-08-16 | 2018-04-20 | 华东理工大学工程设计研究院有限公司 | A kind of exhaust treatment system of polyethers device |
| CN109012037A (en) * | 2018-08-08 | 2018-12-18 | 东华工程科技股份有限公司 | A kind of purification separation system of polyphenylene oxide polymerization tail gas |
-
2019
- 2019-12-10 CN CN201911256511.9A patent/CN111085085A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206350977U (en) * | 2016-12-14 | 2017-07-25 | 威海拓展纤维有限公司 | Waste gas recovery processing unit |
| CN207254050U (en) * | 2017-08-16 | 2018-04-20 | 华东理工大学工程设计研究院有限公司 | A kind of exhaust treatment system of polyethers device |
| CN109012037A (en) * | 2018-08-08 | 2018-12-18 | 东华工程科技股份有限公司 | A kind of purification separation system of polyphenylene oxide polymerization tail gas |
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