CN210495821U - Solvent recovery system in BP-3 drying section vacuum tail gas - Google Patents
Solvent recovery system in BP-3 drying section vacuum tail gas Download PDFInfo
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- CN210495821U CN210495821U CN201921130804.8U CN201921130804U CN210495821U CN 210495821 U CN210495821 U CN 210495821U CN 201921130804 U CN201921130804 U CN 201921130804U CN 210495821 U CN210495821 U CN 210495821U
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Abstract
The utility model discloses a solvent recovery system in BP-3 drying section vacuum tail gas, which comprises a drier, wherein an air outlet pipeline of the drier is connected to a buffer tank, a first condenser is arranged between the drier and the buffer tank, the bottom of the buffer tank is provided with a liquid outlet, the inner side of the top is provided with a baffle plate, and the top is also provided with an air outlet; the gas outlet passes through the pipe connection to vacuum system, be equipped with cooling coil in the vacuum system, vacuum system still is equipped with gas vent and moisturizing mouth, and the gas vent links into the packed tower through the pipeline, and the packed tower bottom is equipped with the liquid outlet, and the liquid outlet is connected to the washing liquid storage tank through the pipeline, and the liquid outlet of washing liquid storage tank is connected to the mouth that mends of spraying entry and vacuum system of packed tower and vacuum system respectively through pipeline and pump. The methanol vapor generated by the dryer is condensed in a buffer tank for the first time, the methanol vapor which is not fully condensed is absorbed and secondarily collected by circulating water of a vacuum system, and finally the residual methanol tail gas is collected for three times by a packed tower when being exhausted. Can achieve the aims of improving the production environment, saving energy and reducing consumption.
Description
Technical Field
The utility model belongs to the technical field of chemical synthesis, concretely relates to solvent recovery system in BP-3 dry section vacuum tail gas.
Background
2-hydroxy-4-methoxybenzophenone (BP-3) is a good cosmetic sunscreen additive, under the United states pharmacopoeia name: oxybenzone. CAS: 131-57-7; the molecular formula is as follows: c14H12O3。
The method adopts 2, 4-dihydroxy benzophenone as a raw material to react and synthesize with dimethyl sulfate in the presence of a solvent and a catalyst, methanol is adopted to carry out BP-3 refining, after the refining is finished, residual solvent methanol needs to be removed by drying, in the process of collecting methanol in a production workshop, because the boiling point of methanol is low, when a single condensation recovery device is adopted for recovery, direct water supplement can form a large amount of high COD wastewater containing methanol and is difficult to treat, and the methanol in a vacuum pump room is found to have large smell through pump collection and has large potential safety hazard, so that a reasonable tail gas absorption system needs to be designed urgently.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a BP-3 dry tail gas handles and solvent recovery system can effectively retrieve the methyl alcohol in the tail gas, realizes retrieving methyl alcohol solvent and utilizes and industrial tail gas's discharge to reach standard.
The technical scheme adopted by the utility model is that the solvent recovery system in the vacuum tail gas of the BP-3 drying section comprises a dryer, wherein a gas outlet pipeline of the dryer is connected to a buffer tank, a first condenser is arranged between the dryer and the buffer tank, a liquid outlet is arranged at the bottom of the buffer tank, a baffle is arranged at the inner side of the top, and a gas outlet is also arranged at the top; the gas outlet passes through the pipe connection to vacuum system, vacuum system includes circulating water tank, sets up cooling coil in the circulating water tank, still is equipped with gas vent and moisturizing mouth on the circulating water tank, and the gas vent passes through the pipeline even to go into the packed tower, and the packed tower bottom is equipped with the liquid outlet, and the liquid outlet is connected to the washing liquid storage tank through the pipeline, and the liquid outlet of washing liquid storage tank is connected to the mouth of moisturizing mouth that sprays entry and vacuum system of packed tower respectively through pipeline and pump.
Furthermore, the middle part of the packed tower is provided with a PP multi-face hollow ball, the multi-face hollow ball is provided with a nozzle, a spraying inlet of the packed tower is connected to the nozzle through a pipeline, and the top of the packed tower is provided with a vent.
Furthermore, a second condenser is arranged between the liquid outlet of the washing liquid storage tank and the spraying inlet of the packed tower.
Further, the first condenser is a spiral plate condenser, and the second condenser is a shell and tube condenser.
Furthermore, the drying machine is a double-cone drying machine, and one or more drying machines are arranged in parallel when the number of the drying machines is multiple.
Furthermore, the joint between the first condenser and the buffer tank and the air outlet of the buffer tank are respectively positioned at two sides of the baffle.
Furthermore, a one-way check valve is arranged between the air outlet of the buffer tank and the vacuum system.
Further, buffer tank and washing liquid storage tank all set up liquid level display.
The utility model has the advantages that:
methanol vapor generated by the dryer is collected in the buffer tank for the first time through condensation, methanol vapor which is not fully condensed is collected for the second time through circulating water absorption of a vacuum system, and finally residual methanol tail gas is collected for three times through the packed tower when being exhausted. Firstly, tail gas exhausted by a dryer enters a first condenser for condensation, most of organic solvent in the tail gas is condensed into liquid state and enters a buffer tank to form high-purity organic solvent, the high-purity organic solvent directly returns to a production system for reuse or for external sale, the condensed and collected medium-concentration tail gas enters a vacuum system, the condensed and collected medium-concentration tail gas enters a water tank of a water-jet vacuum system through circulating spray absorption, and after accumulation of repeated spray absorption, the concentration of methanol in a vacuum pump gradually rises to 50-60%, and the methanol can be taken out for direct sale. The low-concentration tail gas after being sprayed and absorbed enters a packed tower from bottom to top for spray washing, the tail gas and spray water from top to bottom in the tower are subjected to sufficient gas-liquid exchange washing in the packing, the washed tail gas is exhausted, a gas detector is arranged at an exhaust port for discharging into the atmosphere after being detected to be qualified, the spray washing water enters a vacuum system for secondary accumulation after being circularly accumulated to a certain concentration, and the liquid in the vacuum system is discharged after reaching a moving concentration.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be further elucidated with reference to the following examples.
As shown in fig. 1, the solvent recovery system in vacuum tail gas of a BP-3 drying section comprises a dryer 1, an air outlet pipeline of the dryer is connected to a buffer tank 2, a first condenser 2-1 is arranged between the dryer 1 and the buffer tank 2, a liquid outlet 2-3 is arranged at the bottom of the buffer tank 2, a baffle 2-2 is arranged at the inner side of the top of the buffer tank 2, and an air outlet is also arranged at the top of the buffer tank; the gas outlet is connected to a vacuum system 3 through a pipeline, the vacuum system 3 comprises a circulating water tank, a cooling coil pipe 3-1 is arranged in the circulating water tank, a gas outlet 3-2 and a water replenishing port are further arranged on the circulating water tank, the gas outlet 3-2 is connected into a packed tower 5 through a pipeline, a liquid outlet is arranged at the bottom of the packed tower 5 and is connected to a washing liquid storage tank 4 through a pipeline, and the liquid outlet of the washing liquid storage tank 4 is respectively connected to a spraying inlet of the packed tower 5 and the water replenishing port of the vacuum system 3 through a pipeline and a. The system adopts a water injection type vacuum system, and fully mixes methanol which cannot be condensed with water during injection, so as to achieve the purpose of collecting methanol. The air outlet of the buffer tank 2 is connected to the system inlet valve of the vacuum system.
Preferably, the middle part of the packed tower 5 is provided with a PP multi-face hollow ball 5-1, the multi-face hollow ball 5-1 is provided with a nozzle 5-2, a spraying inlet of the packed tower 5 is connected to the nozzle through a pipeline, and the top of the packed tower 5 is provided with an evacuation port 5-3. And residual methanol gas in the tail gas is collected by spraying and washing the tail gas.
Preferably, a second condenser is arranged between the liquid outlet of the washing liquid storage tank 4 and the spraying inlet of the packed tower 5.
Further preferably, the first condenser 2-1 is a spiral plate condenser, the second condenser is a shell-and-tube condenser, the shell side is taken by spray water, and the shell side is taken by cooling medium. The washing liquid is condensed by the cooling medium, and the temperature is controlled below 25 ℃, so that a good absorption washing effect can be ensured.
Preferably, the dryer 1 is a double-cone dryer, and one or more dryers are installed in parallel when the number of dryers is multiple.
Preferably, the joint between the first condenser and the buffer tank and the air outlet of the buffer tank 2 are respectively positioned at two sides of the baffle 2-2. The upper part of the buffer tank is divided into two air chambers by arranging the baffle plate, so that a better sedimentation collection effect is achieved. After heating and drying in vacuum, the difference between the temperature at the upper part and the temperature at the lower part of the buffer tank can be tested to be 0.3 ℃, which indicates that methanol vapor can not be completely condensed by the condenser.
Further preferably, a one-way check valve is arranged between the air outlet of the buffer tank 2 and the vacuum system 3. In the verification process, the vacuum system is stopped, and the vacuum of the buffer tank system and the vacuum of the dryer system is not obviously reduced, so that the check valve has good sealing property.
Preferably, the buffer tank and the washing liquid storage tank are both provided with liquid level displays. Can conveniently observe inside liquid level and in time adjust.
For the arrangement of the cooling coil, after the cooling coil stops working, the liquid temperature rises to 34 ℃ from 28 ℃ after the vacuum system continuously operates for 4 hours, and the liquid temperature can be reduced to below 30 ℃ after the cooling coil is adopted, which shows that the installation of the coil can reduce the circulating water temperature and ensure the stability of the vacuum degree.
Further, an organic gas detection alarm can be arranged at the vent at the top of the packed tower, and the daily monitoring detection numerical value of the methanol concentration is 80-160mg/M3Can realize automatic alarm and discharge control, and when the methanol concentration at the discharge port reaches 190mg/M3In time, the effect of effective control can be achieved by controlling the water temperature or replacing the spray water.
During the concrete operation, the desiccator pipeline connection buffer tank of giving vent to anger, the methanol vapor of high concentration is collected for the first time at the buffer tank completion after through the condensation, and the high-purity methanol liquid that the buffer tank was collected returns production system. The uncondensed methanol vapor is enriched in a circulating water tank of a water jet vacuum system and is used for secondary collection, the methanol concentration is controlled to 50-60 degrees of alcohol content, and then the methanol vapor is discharged into a barrel and can be used as fuel for export treatment. The cooling coil is arranged in the water tank of the water jet vacuum pump, so that the temperature of circulating water for the operation of the water jet vacuum system can be effectively controlled. An exhaust port at the upper part of the water tank of the vacuum system is connected to the spray type packed tower through a pipeline, the cooled low-temperature water is sprayed out from a nozzle at the upper part of the packed tower from top to bottom through pump circulation, the tail gas of the vacuum system from bottom to top is fully washed in the packing, and the washed tail gas is discharged into the atmosphere. The washing liquid storage tank is used as a methanol gas three-level collecting device, and when the concentration of methanol in water is accumulated to a certain concentration, the methanol returns to the vacuum system for continuous enrichment, so that a complete tail gas treatment and solvent recovery system is formed.
Claims (8)
1. A solvent recovery system in BP-3 drying section vacuum tail gas is characterized in that: the drying machine comprises a drying machine (1), wherein an air outlet pipeline of the drying machine is connected to a buffer tank (2), a first condenser (2-1) is arranged between the drying machine (1) and the buffer tank (2), a liquid outlet (2-3) is formed in the bottom of the buffer tank (2), a baffle (2-2) is arranged on the inner side of the top of the buffer tank, and an air outlet is formed in the top of the buffer tank; the gas outlet is connected to the vacuum system (3) through a pipeline, the vacuum system (3) comprises a circulating water tank, a cooling coil (3-1) is arranged in the circulating water tank, a gas outlet (3-2) and a water replenishing port are further arranged on the circulating water tank, the gas outlet (3-2) is connected into the packing tower (5) through a pipeline, a liquid outlet is arranged at the bottom of the packing tower (5) and is connected to the washing liquid storage tank (4) through a pipeline, and the liquid outlet of the washing liquid storage tank (4) is respectively connected to a spraying inlet of the packing tower (5) and the water replenishing port of the vacuum system (3) through a pipeline and.
2. The solvent recovery system of claim 1, wherein: the middle part of the packed tower (5) is provided with a PP multi-face hollow sphere (5-1), the multi-face hollow sphere (5-1) is provided with a nozzle (5-2), a spraying inlet of the packed tower (5) is connected to the nozzle through a pipeline, and the top of the packed tower (5) is provided with an evacuation port (5-3).
3. The solvent recovery system of claim 1, wherein: and a second condenser is arranged between the liquid outlet of the washing liquid storage tank (4) and the spraying inlet of the packed tower (5).
4. The solvent recovery system of claim 3, wherein: the first condenser is a spiral plate condenser, and the second condenser is a shell and tube condenser.
5. The solvent recovery system of claim 1, wherein: the dryer is a double-cone dryer, and one or more dryers are installed in parallel when the number of dryers is multiple.
6. The solvent recovery system of claim 1, wherein: the joint between the first condenser and the buffer tank and the air outlet of the buffer tank (2) are respectively positioned at two sides of the baffle (2-2).
7. The solvent recovery system of claim 6, wherein: and a one-way check valve is arranged between the air outlet of the buffer tank (2) and the vacuum system (3).
8. The solvent recovery system of claim 1, wherein: and the buffer tank and the washing liquid storage tank are both provided with liquid level displays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921130804.8U CN210495821U (en) | 2019-07-18 | 2019-07-18 | Solvent recovery system in BP-3 drying section vacuum tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921130804.8U CN210495821U (en) | 2019-07-18 | 2019-07-18 | Solvent recovery system in BP-3 drying section vacuum tail gas |
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| CN210495821U true CN210495821U (en) | 2020-05-12 |
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| CN201921130804.8U Active CN210495821U (en) | 2019-07-18 | 2019-07-18 | Solvent recovery system in BP-3 drying section vacuum tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113614478A (en) * | 2019-04-02 | 2021-11-05 | 科思创知识产权两合公司 | Drying device, use thereof and method for producing isocyanates using said drying device |
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2019
- 2019-07-18 CN CN201921130804.8U patent/CN210495821U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113614478A (en) * | 2019-04-02 | 2021-11-05 | 科思创知识产权两合公司 | Drying device, use thereof and method for producing isocyanates using said drying device |
| CN113614478B (en) * | 2019-04-02 | 2023-11-17 | 科思创知识产权两合公司 | Drying device and use thereof, and method for producing isocyanates using the drying device |
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