CN214244258U - Continuous dewatering device of ethanol - Google Patents
Continuous dewatering device of ethanol Download PDFInfo
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- CN214244258U CN214244258U CN202120270495.5U CN202120270495U CN214244258U CN 214244258 U CN214244258 U CN 214244258U CN 202120270495 U CN202120270495 U CN 202120270495U CN 214244258 U CN214244258 U CN 214244258U
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Abstract
The utility model discloses an ethanol continuous dehydration device, which comprises a raw material feeding tank, wherein the raw material feeding tank is connected with a raw material vaporizer, the raw material vaporizer is connected with a plurality of dehydration towers, the upper end of each dehydration tower is connected with a decompression condenser, the dehydration towers are connected with a desorption gas cooling device, the desorption gas cooling device is respectively connected with a vacuum gas separator and a crude ethanol intermediate tank, the crude ethanol intermediate tank ethanol rectifying tower is connected, the ethanol rectifying tower is connected with an extractant circulating tank and an extractant feeding pump, the ethanol rectifying tower is connected with an ethanol discharging pump, the ethanol rectifying tower is connected with an extractant recovery tower, and the lower end of the recovery tower is connected with the extractant circulating tank; the ethanol connection dehydration device also comprises a control device. The ethanol/water mixture of the utility model can not return to the pressure swing adsorption system, and the ethanol in the desorption gas can be recovered directly by the method of extractive distillation; and the recovery efficiency of the ethanol is higher than 99.5%, and meanwhile, the complexity of the process flow is reduced, and the overall stability of the device is improved.
Description
Technical Field
The utility model belongs to the technical field of ethanol dewatering device, concretely relates to ethanol continuous dehydration device.
Background
The absolute ethyl alcohol is an ethyl alcohol product with the ethyl alcohol content of more than or equal to 99.5 percent, is an important organic solvent, is widely applied to multiple industries such as medicines, fine chemicals, sanitary products, cosmetics, grease and the like, is also used as an important basic chemical raw material for producing acetaldehyde, ethylamine, ethyl acetate and other products, and derives intermediates of a plurality of products such as medicines, dyes, synthetic rubber, pesticides and the like.
Chinese patents CN202989018U, CN202989016U, CN107602349U, CN108774109A and the like show different methods for ethanol dehydration, and all the patents improve the yield of ethanol products. However, in the apparatus for dehydration in a molecular sieve column, the ethanol/water mixture in the resolution step cannot be separated efficiently, so that there is a problem of waste of raw materials; the ethanol yield can be improved to a certain extent by adding one rectifying tower in the resolving step, but the mixed solution of ethanol and water can form an azeotrope, the single rectifying tower cannot realize the high-purity separation of ethanol and water, the single rectifying tower can greatly improve the operating cost of a rectifying unit, and the whole process cost is increased.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model provides a continuous ethanol dehydration device, which realizes the continuous operation of ethanol dehydration by combining a pressure swing adsorption system and an extraction rectification system; the ethanol/water mixture is not returned to the pressure swing adsorption system, and the ethanol in the analysis gas is directly recovered by an extractive distillation method; and the recovery efficiency of the ethanol is higher than 99.5%, and meanwhile, the complexity of the process flow is reduced, and the overall stability of the device is improved.
In order to achieve the above object, the present invention provides a technical solution for solving the technical problem: the continuous ethanol dehydration device comprises a raw material feeding tank connected with an ethanol-water mixed solution, wherein the raw material feeding tank is connected with a raw material vaporizer, the raw material vaporizer is connected with a plurality of dehydration towers through program control valves, the upper ends of the dehydration towers are connected with a decompression condenser, the lower parts of the dehydration towers are connected with a desorption gas cooling device, the outlet ends of the desorption gas cooling device are respectively connected with a vacuum gas separator and a crude ethanol intermediate tank, the lower ends of the vacuum gas separator are also connected with the crude ethanol intermediate tank, the vacuum gas separator is connected with a vacuum system, the crude ethanol intermediate tank is connected with an ethanol rectifying tower through a crude ethanol feeding pump and a crude ethanol heater, the upper end of the ethanol rectifying tower is connected with an extractant circulating tank and an extractant feeding pump, the upper end discharge hole of the ethanol rectifying tower is connected with an ethanol discharge pump, the lower end discharge hole of the ethanol rectifying tower is connected with an extractant recovery tower, and the lower end of the recovery tower is connected with the extractant circulating tank through an extractant discharge pump; the ethanol connection dehydration device also comprises a control device, and the raw material vaporizer, the program control valve, the dehydration tower, the reduced pressure condenser, the desorption gas cooling device, the vacuum air-liquid separator, the vacuum system, the crude ethanol feeding pump, the ethanol outlet heater, the crude ethanol rectifying tower, the extractant feeding pump, the recovery tower and the extractant discharging pump are all connected with the control device.
The utility model has the advantages that: when the ethanol dehydration is carried out, the hydrous ethanol in the raw material feeding tank is heated into gas through the raw material vaporizer, then the gas is introduced into the dehydration tower from bottom to top, dehydration is carried out under the action of the adsorbent, and the dehydrated qualified ethanol vapor is decompressed and condensed into liquid through the decompression condenser and is sent to a corresponding position for storage. The adsorption and desorption processes in the dehydration tower are alternately carried out, when a certain dehydration tower is saturated by adsorption, the switching of the dehydration tower is controlled by a program control valve, and hydrous ethanol steam is introduced into another dehydration tower, so that continuous and uninterrupted dehydration of ethanol is realized, the dehydration efficiency is improved, the shutdown waiting after the dehydration tower is saturated by adsorption is avoided, and the dehydration cost can be reduced; cooling unqualified steam generated in the dehydration tower into liquid by a desorption gas cooling device, discharging non-condensable residual gas by a vacuum gas-liquid condenser, feeding the liquid obtained by water cooling into a crude ethanol intermediate tank, pressurizing by a crude ethanol feeding pump, feeding into a crude ethanol heater, heating, and feeding into an ethanol rectification tower; the extractant ethylene glycol is added from the top of the ethanol rectifying tower through the extractant circulating tank by the extractant feeding pump, the high-purity product ethanol is obtained by rectification under the action of the extractant, the high-purity product ethanol is output and stored from the top of the tower, the other part of ethanol is condensed into liquid for backflow, the mixed liquid of water and the ethylene glycol at the bottom of the rectifying tower enters the extractant recovering tower for efficient separation, the waste water at the top of the extractant recovering tower is directly discharged after reaching the discharge standard, the ethylene glycol at the bottom of the extractant recovering tower flows back to the storage tank for recycling, the dehydration cost is reduced, the whole device is controlled by the control device, the automatic operation of the dehydration device is realized, the manpower and material resources are saved, the dehydration cost is reduced, and the stability of the device is improved.
Further, the analysis gas cooling device comprises a first water cooler and a second water cooler, the upper ends of the first water cooler and the second water cooler are connected with the vacuum gas-liquid separator, and the lower ends of the first water cooler and the second water cooler are connected with the crude ethanol intermediate tank.
The beneficial effect of adopting the further scheme is that: the water cooling is carried out on the steam discharged from the dehydration tower through the first water cooler and the second water cooler, and the water cooling effect can be better ensured in the two water cooling processes, so that the preparation is made for subsequent use.
Furthermore, a raw material vaporizer, a program control valve, a dehydration tower, a decompression condenser, a desorption gas cooling device, a vacuum gas-liquid separator, a vacuum system, a crude ethanol feeding pump, an ethanol outlet heater, a crude ethanol rectifying tower, an extractant feeding pump, a recovery tower and an extractant discharging pump are all provided with temperature sensors and pressure sensors.
The beneficial effect of adopting the further scheme is that: the temperature sensors and the pressure sensors are arranged at a plurality of positions of the device and are used for monitoring the operation of the whole device, so that the device is convenient to adjust in time when abnormal conditions exist, and the orderly operation of the device is ensured.
Further, the control device is a computer.
The beneficial effect of adopting the further scheme is that: the operation of the whole device is controlled by the computer, the integral automation degree is improved, and manpower and material resources are saved.
Drawings
FIG. 1 is a schematic diagram of a continuous ethanol dehydration unit;
FIG. 2 is a resolution gas cooling arrangement;
wherein, E0101, raw material vaporizer; e0102, a desorption gas cooling device; e0103, a crude ethanol heater; e0104, a decompression condenser; v0101, a raw material feeding tank; v0102, an extractant circulating tank; v0103, a vacuum gas-liquid separator; v0104, a crude ethanol intermediate tank; t0101, a dehydration tower; t0102, an ethanol rectification tower; t0103, an extractant recovery tower; p0101, an extractant feed pump; p0102, crude ethanol feed pump; p0103, an ethanol discharge pump; p0104 and an extractant discharge pump.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
In one embodiment of the present invention, as shown in fig. 1-2, a continuous ethanol dehydration device is provided, which comprises a raw material feeding tank V0101 connected with an ethanol-water mixture, the raw material feeding tank V0101 is connected with a raw material vaporizer E0101, the raw material vaporizer E0101 is connected with a plurality of dehydration towers T0101 through program control valves, the upper ends of the dehydration towers T0101 are connected with a decompression condenser E0104, the lower part of the dehydration tower T0101 is connected with a resolution gas cooling device E0102, the outlet end of the resolution gas cooling device E0102 is connected with a vacuum gas separator V0103 and a crude ethanol intermediate tank V0104 respectively, the lower end of the vacuum gas separator V0103 is also connected with the crude ethanol intermediate tank V0104, the vacuum gas separator V0103 is connected with a vacuum system, the crude ethanol intermediate tank V0104 is connected with an ethanol rectification tower T0102 through a crude ethanol feeding pump P0102 and a crude ethanol heater E0103, the upper end of the ethanol rectification tower 0102 is connected with an extractant circulation tank V0102 and an extractant feeding pump P0101, a discharge port at the upper end of the ethanol rectifying tower T0102 is connected with an ethanol discharge pump P0103, a discharge port at the lower end of the ethanol rectifying tower T0102 is connected with an extractant recovery tower T0103, and the lower end of the recovery tower is connected with an extractant circulating tank V0102 through an extractant discharge pump P0104; the ethanol connecting and dehydrating device also comprises a control device, and the raw material vaporizer E0101, the program control valve, the dehydrating tower T0101, the decompression condenser E0104, the analysis gas cooling device E0102, the vacuum air-liquid separator V0103, the vacuum system, the crude ethanol feed pump P0102, the ethanol outlet heater, the crude ethanol rectifying tower T0102, the extractant feed pump P0101, the recovery tower and the extractant discharge pump P0104 are all connected with the control device. When the ethanol dehydration is carried out, the hydrous ethanol in the raw material feeding tank V0101 is heated into gas through the raw material vaporizer E0101, then the gas is introduced into the dehydration tower T0101 from bottom to top, the dehydration is carried out under the action of an adsorbent, and the dehydrated qualified ethanol steam is decompressed and condensed into liquid through the decompression condenser E0104 and is sent to a corresponding position for storage. The adsorption and desorption processes in the dehydration tower T0101 are alternately carried out, when a certain dehydration tower T0101 is saturated in adsorption, the switching of the dehydration tower T0101 is controlled by a program control valve, and the hydrous ethanol steam is introduced into another dehydration tower T0101, so that the continuous and uninterrupted dehydration of ethanol is realized, the dehydration efficiency is improved, the shutdown waiting after the dehydration tower T0101 is saturated in adsorption is avoided, and the dehydration cost can be reduced; the unqualified steam generated in the dehydration tower T0101 is cooled into liquid by a desorption gas cooling device E0102, the non-condensable residual gas is discharged by a vacuum gas-liquid condenser, the liquid obtained by water cooling enters a crude ethanol intermediate tank V0104, is pressurized by a crude ethanol feed pump P0102, enters a crude ethanol heater E0103, is heated and enters an ethanol rectification tower T0102; the extractant ethylene glycol is added from the top of an ethanol rectifying tower T0102 through an extractant circulating tank V0102 by an extractant feeding pump P0101, the high-purity product ethanol is rectified under the action of the extractant, the high-purity product ethanol is output and stored from the top of the tower, the other part of ethanol is condensed into liquid for backflow, the mixed liquid of water and the ethylene glycol at the bottom of the rectifying tower enters an extractant recovery tower T0103 for efficient separation, the waste water at the top of the extractant recovery tower T0103 reaches the discharge standard and is directly discharged, the ethylene glycol at the bottom flows back to a storage tank for recycling, the dehydration cost is reduced, the whole device is controlled by a control device, the automatic operation of the dehydration device is realized, the manpower and material resources are saved, the dehydration cost is reduced, and the stability of the device is improved.
The analytic gas cooling device E0102 comprises a first water cooler and a second water cooler, the upper ends of the first water cooler and the second water cooler are connected with the vacuum gas-liquid separator V0103, and the lower ends of the first water cooler and the second water cooler are connected with the crude ethanol intermediate tank V0104; the water cooling of the discharged steam in the dehydration tower T0101 is carried out through the first water cooler and the second water cooler, and the water cooling effect can be better ensured through the two water cooling processes, so that the preparation is made for subsequent use. Temperature sensors and pressure sensors are arranged on the raw material vaporizer E0101, the program control valve, the dehydration tower T0101, the decompression condenser E0104, the analysis gas cooling device E0102, the vacuum air-liquid separator V0103, the vacuum system, the crude ethanol feeding pump P0102, the ethanol outlet heater, the crude ethanol rectifying tower T0102, the extractant feeding pump P0101, the recovery tower and the extractant discharging pump P0104; the temperature sensors and the pressure sensors are arranged at a plurality of positions of the device and are used for monitoring the operation of the whole device, so that the device is convenient to adjust in time when abnormal conditions exist, and the orderly operation of the device is ensured. The control device is a computer; the operation of the whole device is controlled by the computer, the integral automation degree is improved, and manpower and material resources are saved.
While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (4)
1. A continuous ethanol dehydration device is characterized by comprising a raw material feeding tank connected with an ethanol-water mixed solution, wherein the raw material feeding tank is connected with a raw material vaporizer, the raw material vaporizer is connected with a plurality of dehydration towers through program control valves, the upper ends of the dehydration towers are connected with a pressure reduction condenser, the lower sides of the dehydration towers are connected with a desorption gas cooling device, the outlet ends of the desorption gas cooling device are respectively connected with a vacuum gas-liquid separator and a crude ethanol intermediate tank, the lower end of the vacuum gas-liquid separator is also connected with the crude ethanol intermediate tank, the vacuum gas-liquid separator is connected with a vacuum system, the crude ethanol intermediate tank is connected with an ethanol rectifying tower through a crude ethanol feeding pump and a crude ethanol heater, the upper end of the ethanol rectifying tower is connected with an extractant circulating tank and an extractant feeding pump, and the upper end discharge hole of the ethanol rectifying tower is connected with an ethanol discharge pump, a discharge hole at the lower end of the ethanol rectifying tower is connected with an extractant recovery tower, and the lower end of the recovery tower is connected with the extractant circulating tank through an extractant discharge pump; the ethanol continuous dehydration device also comprises a control device, and the raw material vaporizer, the program control valve, the dehydration tower, the decompression condenser, the analysis gas cooling device, the vacuum liquid separator, the vacuum system, the crude ethanol feeding pump, the crude ethanol heater, the crude ethanol rectifying tower, the extractant feeding pump, the recovery tower and the extractant discharging pump are all connected with the control device.
2. The continuous ethanol dehydration device according to claim 1, characterized in that the desorption gas cooling device comprises a first water cooler and a second water cooler, the upper ends of the first water cooler and the second water cooler are connected with the vacuum liquid separator, and the lower ends of the first water cooler and the second water cooler are connected with the crude ethanol intermediate tank.
3. The continuous ethanol dehydration plant of claim 1, wherein the feedstock vaporizer, the program control valve, the dehydration column, the vacuum condenser, the desorption gas cooling device, the vacuum gas-liquid separator, the vacuum system, the crude ethanol feed pump, the crude ethanol heater, the crude ethanol rectification column, the extractant feed pump, the recovery column, and the extractant discharge pump are all provided with temperature sensors and pressure sensors.
4. The apparatus for continuous dehydration of ethanol according to claim 1, wherein said control means is a computer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120270495.5U CN214244258U (en) | 2021-01-29 | 2021-01-29 | Continuous dewatering device of ethanol |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120270495.5U CN214244258U (en) | 2021-01-29 | 2021-01-29 | Continuous dewatering device of ethanol |
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| CN214244258U true CN214244258U (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779497A (en) * | 2022-12-07 | 2023-03-14 | 九江中船消防设备有限公司 | 2-bromo-3,3,3-trifluoropropene water removal device |
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2021
- 2021-01-29 CN CN202120270495.5U patent/CN214244258U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779497A (en) * | 2022-12-07 | 2023-03-14 | 九江中船消防设备有限公司 | 2-bromo-3,3,3-trifluoropropene water removal device |
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