CN216549990U - Waste liquid recycling system - Google Patents
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- CN216549990U CN216549990U CN202122323913.5U CN202122323913U CN216549990U CN 216549990 U CN216549990 U CN 216549990U CN 202122323913 U CN202122323913 U CN 202122323913U CN 216549990 U CN216549990 U CN 216549990U
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Abstract
The utility model provides a waste liquid recycling system, which belongs to the technical field of chemical separation and comprises a light component removing tower, a heavy component removing tower, a dehydration tower and a pervaporation membrane device. The lightness-removing tower is provided with a waste liquid inlet, a gas phase outlet and a liquid phase outlet; the de-heavy tower is provided with a liquid phase inlet, a side outlet, a top outlet and a bottom outlet which are connected with the liquid phase outlet; the top of the dehydration tower is provided with an upper outlet, the bottom of the dehydration tower is provided with a lower outlet, the side wall of the lower part of the dehydration tower is provided with a gas phase inlet and a wastewater reflux port, and the gas phase inlet is connected with the gas phase outlet; the pervaporation membrane device is provided with a material inlet, a discharge port and a water discharge port, wherein the material inlet is respectively connected with the upper outlet and the top outlet. The system provided by the utility model can separate various substances such as methanol, water, BDO, tar and the like in the BDO waste liquid, recycles resources, avoids resource waste and realizes win-win effect and environmental protection.
Description
Technical Field
The utility model belongs to the technical field of chemical separation process equipment, and particularly relates to a waste liquid recycling system.
Background
1, 4-butanediol (BDO for short) is an important organic and fine chemical raw material, is widely applied to the fields of medicine, chemical industry, textile, papermaking, automobiles, daily chemical industry and the like, and is mainly used for producing tetrahydrofuran, gamma-butyrolactone, polybutylene terephthalate and the like.
At present, a common production method of 1, 4-butanediol is an alkynal method, namely acetylene and formaldehyde react in the presence of a Cu-Bi catalyst to prepare 1, 4-butynediol, then the 1, 4-butenedioic acid salt is generated through skeletal nickel catalysis and hydrogenation, 1, 4-butanediol is generated through further catalytic hydrogenation, and a pure product is obtained through concentration, desalination and rectification. The process route has uniform reaction temperature and stable quality, but also can generate a certain amount of waste liquid, wherein the waste liquid mainly contains 30-40 wt% of BDO, 30-40 wt% of methanol and water and 20-40 wt% of tar. The waste liquid is difficult to treat, and is usually burnt or treated as dangerous waste to professional institutions, so that the waste of resources is caused. Although the prior art also has reports about the treatment of such waste liquid by a waste liquid recovery system, the recovery system needs a plurality of refining towers matched with treatment units such as an evaporator, a de-heavy tower and the like, and has large energy consumption and complex operation.
Therefore, in order to solve the problems, it is of great significance to improve a recycling comprehensive utilization system of the waste liquid in the production of 1, 4-butanediol.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a waste liquid recycling system, and aims to solve the problem that the conventional 1, 4-butanediol production waste liquid treatment is high in energy consumption and complex in process.
In order to achieve the purpose, the utility model adopts the technical scheme that: provides a waste liquid recycling system, which comprises a light component removing tower, a heavy component removing tower, a dehydration tower and a pervaporation membrane device. The bottom of the lightness-removing tower is provided with a lightness-removing tower kettle, the upper part of the lightness-removing tower is provided with a lightness-removing tower body communicated with the lightness-removing tower kettle, the middle part of the lightness-removing tower body is provided with a waste liquid inlet for receiving BDO waste liquid, the top of the lightness-removing tower body is provided with a gas phase outlet for discharging light phase components, and the lower part of the lightness-removing tower kettle is provided with a liquid phase outlet for discharging heavy component tar and BDO; the bottom of the heavy component removal tower is provided with a heavy component removal tower kettle, the upper part of the heavy component removal tower is provided with a heavy component removal tower body communicated with the heavy component removal tower kettle, the lower part of the heavy component removal tower body is provided with a liquid phase inlet connected with a liquid phase outlet at the lower part of the light component removal tower kettle, the middle part of the heavy component removal tower body is provided with a side outlet, the top of the heavy component removal tower body is provided with a top outlet, and the lower part of the heavy component removal tower kettle is provided with a bottom outlet; the top of the dehydration tower is provided with an upper outlet, the bottom of the dehydration tower is provided with a lower outlet, the side wall of the lower part of the dehydration tower, which is positioned below the bottom filler, is provided with a gas phase inlet and a wastewater return port respectively, the gas phase inlet is positioned above the wastewater liquid level, the wastewater return port is positioned below the wastewater liquid level, and the gas phase inlet is connected with the gas phase outlet at the top of the lightness removing tower body; the pervaporation membrane device is provided with a material inlet, a discharge port and a water discharge port, wherein the material inlet is respectively connected with an upper outlet at the top of the dehydration tower and a top outlet at the top of the de-heavy tower body and is used for separating methanol and water to obtain concentrated methanol.
As another embodiment of the utility model, a low-temperature heating device is arranged in the lightness-removing column kettle and is used for converting methanol and water in waste liquid into gas state and discharging the gas state from a gas phase outlet at the top of the lightness-removing column body.
As another embodiment of the utility model, the low-temperature heating device is a steam heating component.
As another embodiment of the utility model, a plurality of layers of fillers are arranged in the lightness-removing column, and a BDO condenser is arranged above the top layer of fillers, and is used for condensing high boiling point substances carried by gaseous methanol and water under the condensation action and returning the condensed high boiling point substances to the lightness-removing column kettle.
As another embodiment of the utility model, a high-temperature heating device is arranged in the de-heavy tower kettle and is used for converting methanol and water which are not separated from the tar and BDO solution into gaseous state and discharging the gaseous state from a top outlet at the top of the de-heavy tower body.
As another embodiment of the present invention, the high temperature heating device is a heat conducting oil heating assembly.
As another embodiment of the utility model, the side wall of the upper part of the heavy component removing tower body is also provided with an alcohol-water reflux port which is connected with a top outlet at the top of the heavy component removing tower body through an alcohol-water reflux pipeline; the alcohol-water return pipeline is sequentially provided with an alcohol-water condenser, an alcohol-water tank and a circulating pump, and is used for enabling the condensed alcohol water to flow back into the de-heavy tower and adjusting the temperature of the middle part of the de-heavy tower body; and an alcohol-water discharge pipeline connected with a material inlet of the pervaporation membrane device is arranged on a pipeline between the circulating pump and the alcohol-water backflow port and used for conveying a methanol-water mixture to the pervaporation membrane device for separation.
As another embodiment of the utility model, a plurality of layers of packing are arranged in the dehydration tower, and a water condenser is arranged above the top layer of packing and used for converting gaseous water into liquid under the action of the water condenser and returning the liquid to the bottom of the dehydration tower.
As another embodiment of the utility model, an external circulation pipeline is arranged between a lower outlet at the bottom of the dehydration tower and the wastewater return opening; and the external circulation pipeline is provided with a heating heat exchanger for stirring the wastewater at the bottom of the dehydration tower, adjusting the temperature of the wastewater and promoting the separation of methanol and water.
As another embodiment of the present invention, the inside of the pervaporation membrane device is divided into a permeation cavity and a concentrated solution cavity by a pervaporation membrane, the material inlet and the discharge port are both disposed on an outer wall communicated with the concentrated solution cavity, and the water discharge port is disposed on an outer wall communicated with the permeation cavity.
As another embodiment of the utility model, the device also comprises a methanol tank which is connected with the discharge port of the pervaporation membrane device through a methanol condenser and is used for collecting methanol.
As another embodiment of the present invention, temperature monitors are disposed at the bottom and top of the light component removal tower, at the top and bottom of the dehydration tower, and at the bottom and middle of the heavy component removal tower, respectively, for detecting real-time temperatures of corresponding regions.
The working principle of the utility model is as follows:
adding BDO waste liquid into a light component removal tower through a waste liquid inlet in the middle of the light component removal tower, controlling the temperature of a light component removal tower kettle to be 120-140 ℃, the temperature of the top of the light component removal tower to be 95-105 ℃, and the pressure to be normal pressure, converting light phase components methanol and water in the BDO waste liquid into gas phase, and discharging the gas phase from a gas phase outlet at the top of the light component removal tower, wherein high boiling point substances carried by the gas phase methanol and water are condensed into large granular substances under the action of a BDO condenser at the top and fall back to the light component removal tower kettle; obtaining a mixed solution of tar and BDO at the bottom of the light component removal tower; gaseous methanol and water discharged from a gas phase outlet at the top of the lightness-removing column pass through a gas phase inlet of a dehydration column to the inside of the dehydration column, the temperature of wastewater at the bottom of the dehydration column is controlled to be 90-97 ℃, the temperature at the top of the dehydration column is controlled to be 64-68 ℃, the pressure is normal pressure, gaseous methanol continuously rises to the top of the dehydration column and is discharged from a methanol discharge port, and the gaseous water is converted into liquid under the action of a filler in the dehydration column and a water condenser at the top and falls back to the bottom of the dehydration column; obtaining waste water at the bottom of the dehydration tower; and the gaseous methanol discharged from the methanol discharge outlet at the top of the dehydration tower flows to the pervaporation membrane device through a material inlet of the pervaporation membrane device, and the methanol is discharged through a discharge outlet, passes through a methanol condenser and then flows to a methanol tank. Discharging a mixed solution of tar and BDO obtained in the kettle of the light component removal tower through a liquid phase outlet of the light component removal tower, controlling the pressure in the heavy component removal tower to be-0.85 to-0.01 MPa from a liquid phase inlet of the heavy component removal tower to the heavy component removal tower by controlling the temperature of the kettle of the heavy component removal tower to be 180-plus-200 ℃, controlling the temperature in the middle of the heavy component removal tower to be 160-plus-170 ℃, converting a small amount of methanol and water which are not separated in the tar and BDO solution into a gas state at a high temperature, discharging the gas from a top outlet at the top of the heavy component removal tower, condensing the gas by using an alcohol-water condenser to obtain a methanol solution, conveying the methanol solution to a methanol water tank, conveying part of the methanol solution to the upper part of a packing layer at the top in the heavy component removal tower by using a circulating pump, and conveying the other part of the methanol solution to a pervaporation membrane device for concentration and dehydration; discharging BDO in the tar and the BDO solution from a side outlet in the middle of the de-heavy tower to a BDO discharge pipeline and conveying the BDO solution to a subsequent process; the tar is left in the heavy component removal tower kettle and is discharged from a bottom outlet to a tar discharge pipeline to be sent to an incineration section.
The waste liquid recycling system provided by the utility model has the beneficial effects that: compared with the prior art, the waste liquid recycling system has the advantages that BDO waste liquid is subjected to primary light component removal treatment through the light component removal tower, methanol and water in the waste liquid are converted into gaseous state and enter the dehydration tower to be further dehydrated and separated, the dehydrated methanol is concentrated through the pervaporation membrane device to obtain methanol, meanwhile, heavy component tar and BDO discharged through the light component removal tower enter the heavy component removal tower, methanol water is further separated and sent to the pervaporation membrane device to be concentrated to obtain methanol, and the tar and the BDO are obtained respectively. The utility model adopts multi-tower rectification and pervaporation membrane concentration dehydration integration technology to separate methanol, water, BDO, tar and other substances in BDO waste liquid, the obtained methanol can be sold outside, the obtained water can be reused in the original production process, the obtained BDO can be refined to obtain high-purity BDO, the economic benefit of enterprises is improved, or the obtained BDO is directly used for producing tetrahydrofuran, and the obtained tar can utilize the heat value after being burnt. The utility model not only reduces the treatment cost of BDO waste liquid, changes various substances in the BDO waste liquid into valuable, but also realizes the win-win of benefit and environmental protection, and accords with the national industrialization policy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of a connection structure of a waste liquid recycling system according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure of a waste liquid recycling system according to an embodiment of the present invention;
in the figure: 100. a light component removal tower; 110. a light component removal tower kettle; 111. a liquid phase outlet; 112. a low temperature heating device; 113. a delivery pump; 120. a lightness removing tower body; 121. a waste liquid inlet; 122. a gas phase outlet; 123. a BDO condenser; 200. a de-weighting tower; 210. a heavy component removal tower kettle; 211. a bottom outlet; 212. a high temperature heating device; 220. a heavy component removal tower body; 221. a liquid phase inlet; 222. a side outlet; 223. a top outlet; 224. an alcohol-water reflux port; 225. an alcohol-water condenser; 226. an alcohol water tank; 227. a circulation pump; 300. a dehydration tower; 301. an upper outlet; 302. a lower outlet; 303. a gas phase inlet; 304. a wastewater return port; 305. a water condenser; 400. a pervaporation membrane device; 401. a material inlet; 402. a discharge port; 403. a water discharge port; 500. a methanol tank; 501. a methanol condenser.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 to 2, a waste liquid recycling system according to the present invention will be described. The waste liquid recycling system comprises a light component removal tower 100, a heavy component removal tower 200, a dehydration tower 300 and a pervaporation membrane device 400. The bottom of the lightness-removing tower 100 is provided with a lightness-removing tower kettle 110, the upper part of the lightness-removing tower is provided with a lightness-removing tower body 120 communicated with the lightness-removing tower kettle 110, the middle part of the lightness-removing tower body 120 is provided with a waste liquid inlet 121 for receiving BDO waste liquid, the top of the lightness-removing tower body 120 is provided with a gas phase outlet 122 for discharging light phase components, and the lower part of the lightness-removing tower kettle 110 is provided with a liquid phase outlet 111 for discharging heavy component tar and BDO; the bottom of the heavy component removal tower 200 is provided with a heavy component removal tower kettle 210, the upper part of the heavy component removal tower 200 is provided with a heavy component removal tower body 220 communicated with the heavy component removal tower kettle 210, the lower part of the heavy component removal tower body 220 is provided with a liquid phase inlet 221 connected with a liquid phase outlet 111 at the lower part of the light component removal tower kettle 110, the middle part of the heavy component removal tower body 220 is provided with a side outlet 222, the top of the heavy component removal tower body 220 is provided with a top outlet 223, and the lower part of the heavy component removal tower kettle 210 is provided with a bottom outlet 211; the top of the dehydration tower 300 is provided with an upper outlet 301, the bottom of the dehydration tower is provided with a lower outlet 302, the side wall of the lower part of the dehydration tower is provided with a gas phase inlet 303 and a wastewater return opening 304 which are positioned below the bottom layer filler, the gas phase inlet 303 is positioned above the liquid level of the wastewater, the wastewater return opening 304 is positioned below the liquid level of the wastewater, and the gas phase inlet 303 is connected with the gas phase outlet 122 at the top of the lightness removing tower body 120; the pervaporation membrane device 400 is provided with a material inlet 401, a discharge port 402 and a water discharge port 403, wherein the material inlet 401 is respectively connected with an upper outlet 301 at the top of the dehydration tower 300 and a top outlet 223 at the top of the de-weighting tower body 220 for separating methanol and water to obtain concentrated methanol.
Compared with the prior art, the waste liquid recycling system provided by the utility model has the advantages that BDO waste liquid is subjected to primary light component removal treatment through the light component removal tower 100, methanol and water in the waste liquid are converted into gaseous state and enter the dehydration tower 300 for further dehydration and separation, the dehydrated methanol is concentrated through the pervaporation membrane device 400 to obtain methanol, meanwhile, heavy component tar and BDO discharged through the light component removal tower 100 enter the heavy component removal tower 200, methanol water is further separated and sent to the pervaporation membrane device 400 for concentration to obtain methanol, and the tar and the BDO are respectively obtained. The utility model adopts multi-tower rectification and pervaporation membrane concentration dehydration integration technology to separate methanol, water, BDO, tar and other substances in BDO waste liquid, the obtained methanol can be sold outside, the obtained water can be reused in the original production process, the obtained BDO can be refined to obtain high-purity BDO, the economic benefit of enterprises is improved, or the obtained BDO is directly used for producing tetrahydrofuran, and the obtained tar can utilize the heat value after being burnt. The utility model not only reduces the treatment cost of BDO waste liquid, changes various substances in the BDO waste liquid into valuable substances, avoids the waste of resources, but also realizes the win-win effect of benefit and environmental protection, and accords with the national industrialization policy.
Referring to fig. 1 and 2, a low-temperature heating device 112 is disposed in the lightness-removing column 110 for converting methanol and water in the waste liquid into gas, and the gas is discharged from a gas phase outlet 122 at the top of the lightness-removing column 120.
Referring to fig. 1 and 2, as an embodiment of the waste liquid recycling system provided by the present invention, a steam heating element is selected as the low-temperature heating device 112.
Referring to fig. 1 and 2, a plurality of layers of packing are disposed in the lightness-removing column 120, and a BDO condenser 123 is disposed above the top layer of packing, so as to condense high boiling point substances (heavy components) carried by gaseous methanol and water under the condensation action and return the condensed high boiling point substances to the lightness-removing column bottom 110.
Referring to fig. 1 and 2, a high temperature heating device 212 is disposed in the de-heavy tower 210 for converting methanol and water that are not separated from the tar and BDO solution into gas, and discharging the gas from a top outlet 223 at the top of the de-heavy tower 220.
Referring to fig. 1 and 2, as an embodiment of the waste liquid recycling system provided by the present invention, the high temperature heating device 212 is a heat conducting oil heating element.
As a specific embodiment of the waste liquid recycling system provided by the present invention, please refer to fig. 1 and fig. 2, a plurality of layers of fillers are disposed in the de-weighting tower 220, so as to facilitate discharging BDO from the side outlet 222.
As a specific embodiment of the waste liquid recycling system provided by the present invention, please refer to fig. 2, the sidewall of the upper portion of the de-heavy tower body 220 is further provided with an alcohol-water reflux port 224, which is connected to a top outlet 223 at the top of the de-heavy tower body 220 through an alcohol-water reflux pipeline; an alcohol-water condenser 225, an alcohol-water tank 226 and a circulating pump 227 are sequentially arranged on the alcohol-water return pipeline, and are used for enabling the condensed alcohol-water part to flow back into the de-heavy tower 200, adjusting the temperature of the middle part of the de-heavy tower body 220 and ensuring the smooth discharge of BDO; an alcohol-water discharge pipeline connected with the material inlet 401 of the pervaporation membrane device 400 is arranged on a pipeline between the circulating pump 227 and the alcohol-water return opening 224 and is used for conveying the methanol-water mixture to the pervaporation membrane device 400 for separation.
Referring to fig. 1 and 2, as an embodiment of the waste liquid recycling system provided by the present invention, a pipeline between the liquid phase outlet 111 and the liquid phase inlet 221 is provided with a delivery pump 113.
Referring to fig. 1 and 2, a plurality of layers of packing are disposed in the dehydration tower 300, and a water condenser 305 is disposed above the top packing for converting gaseous water into liquid under the action of the water condenser 305 and returning the liquid to the bottom of the dehydration tower 300.
As a specific embodiment of the waste liquid recycling system provided by the present invention, please refer to fig. 1 and 2, an external circulation pipeline is disposed between a lower outlet 302 at the bottom of a dehydration tower 300 and a waste water reflux inlet 304; the external circulation pipeline is provided with a heating heat exchanger 306 for stirring the wastewater at the bottom of the dehydration tower 300 and adjusting the temperature of the wastewater to 90-97 ℃ to promote the separation of methanol and water.
Referring to fig. 1 and 2, as a specific embodiment of the waste liquid recycling system provided by the present invention, the interior of the pervaporation membrane device 400 is divided into a permeation cavity and a concentrated liquid cavity by a pervaporation membrane, a material inlet 401 and a discharge port 402 are both disposed on an outer wall communicated with the concentrated liquid cavity, and a water discharge port 403 is disposed on an outer wall communicated with the permeation cavity.
Referring to fig. 2, the system for recycling waste liquid according to an embodiment of the present invention further includes a methanol tank 500, wherein the methanol tank 500 is connected to the discharge port 402 of the pervaporation membrane device 400 through a methanol condenser 501, and is configured to collect methanol.
As a specific embodiment of the waste liquid recycling system provided by the present invention, temperature monitors are disposed at the top and bottom of the light component removal tower 100, the top and bottom of the dehydration tower 300, and the bottom and middle of the heavy component removal tower 200, respectively, for detecting real-time temperatures of corresponding regions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a waste liquid recycling system which characterized in that includes:
the device comprises a lightness-removing tower, a liquid-phase separator and a liquid-phase separator, wherein the bottom of the lightness-removing tower is provided with a lightness-removing tower kettle, the upper part of the lightness-removing tower is provided with a lightness-removing tower body communicated with the lightness-removing tower kettle, the middle part of the lightness-removing tower body is provided with a waste liquid inlet for receiving waste liquid to be treated, the top of the lightness-removing tower body is provided with a gas-phase outlet for discharging light-phase components, and the lower part of the lightness-removing tower kettle is provided with a liquid-phase outlet for discharging heavy components;
the heavy component removing tower is characterized in that the bottom of the heavy component removing tower is provided with a heavy component removing tower kettle, the upper part of the heavy component removing tower is provided with a heavy component removing tower body communicated with the heavy component removing tower kettle, the lower part of the heavy component removing tower body is provided with a liquid phase inlet connected with a liquid phase outlet at the lower part of the light component removing tower kettle, the middle part of the heavy component removing tower body is provided with a side outlet, the top of the heavy component removing tower body is provided with a top outlet, and the lower part of the heavy component removing tower kettle is provided with a bottom outlet;
the top of the dehydration tower is provided with an upper outlet, the bottom of the dehydration tower is provided with a lower outlet, a gas phase inlet and a reflux port are respectively arranged on the side wall of the lower part below the bottom filler, the gas phase inlet is positioned above the liquid level of the wastewater, the reflux port is positioned below the liquid level of the wastewater, and the gas phase inlet is connected with the gas phase outlet at the top of the lightness removing tower body;
and the pervaporation membrane device is provided with a material inlet, a discharge port and a water discharge port, wherein the material inlet is respectively connected with the upper outlet at the top of the dehydration tower and the top outlet at the top of the de-heavy tower body and is used for separating methanol and water to obtain concentrated methanol.
2. The waste liquid recycling system according to claim 1, wherein a low temperature heating device is provided in the lightness-removing column for converting methanol and water in the waste liquid into gas phase and discharging the gas phase from a gas phase outlet at the top of the lightness-removing column.
3. The waste liquid recycling system according to claim 1, wherein a plurality of layers of packing are disposed in the lightness-removing column, and a BDO condenser is disposed above the top packing for condensing gaseous methanol and water-carried high boiling point substances and returning the condensed high boiling point substances to the lightness-removing column.
4. The waste liquid recycling system according to claim 1, wherein a high temperature heating device is provided in the de-heavy tower for converting methanol and water which are not separated from the tar and BDO solution into gas phase, and discharging the gas phase from a top outlet at the top of the de-heavy tower.
5. The waste liquid recycling system of claim 1, wherein the upper side wall of the de-heavy tower is further provided with an alcohol-water return port connected to a top outlet at the top of the de-heavy tower through an alcohol-water return line; the alcohol-water return pipeline is sequentially provided with an alcohol-water condenser, an alcohol-water tank and a circulating pump, and is used for enabling the condensed alcohol water to flow back into the de-heavy tower and adjusting the temperature of the middle part of the de-heavy tower body; and an alcohol-water discharge pipeline connected with a material inlet of the pervaporation membrane device is arranged on a pipeline between the circulating pump and the alcohol-water backflow port and used for conveying a methanol-water mixture to the pervaporation membrane device for separation.
6. The waste liquid recycling system according to claim 1, wherein a plurality of layers of packing are disposed in the dehydration column, and a water condenser is disposed above the top layer of packing, for converting the water in the gas state into the liquid state under the action of the water condenser and returning the liquid state to the bottom of the dehydration column.
7. The waste liquid recycling system according to claim 1, wherein an external circulation line is provided between the lower outlet at the bottom of the dehydration tower and the waste water return port; and the external circulation pipeline is provided with a heating heat exchanger for stirring the wastewater at the bottom of the dehydration tower, adjusting the temperature of the wastewater and promoting the separation of methanol and water.
8. The waste liquid recycling system according to claim 1, wherein the inside of the pervaporation membrane device is divided into a permeation chamber and a concentrate chamber by a pervaporation membrane, the material inlet and the discharge port are both provided on an outer wall communicating with the concentrate chamber, and the drain port is provided on an outer wall communicating with the permeation chamber.
9. The waste liquid recycling system according to claim 1, further comprising:
and the methanol tank is connected with the discharge port of the pervaporation membrane device through a methanol condenser and is used for collecting methanol.
10. The waste liquid recycling system according to any of claims 1 to 9, wherein the top and bottom of the light component removal column, the top and bottom of the dehydration column, and the middle and bottom of the heavy component removal column are provided with temperature monitors for detecting real-time temperatures of corresponding regions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117658260A (en) * | 2023-12-04 | 2024-03-08 | 重庆中润新材料股份有限公司 | Tetrahydrofuran waste liquid recovery system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117658260A (en) * | 2023-12-04 | 2024-03-08 | 重庆中润新材料股份有限公司 | Tetrahydrofuran waste liquid recovery system and method |
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