CN210952419U - Salt cooling device for acetylene polymerization reaction gas - Google Patents
Salt cooling device for acetylene polymerization reaction gas Download PDFInfo
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- CN210952419U CN210952419U CN201921406510.3U CN201921406510U CN210952419U CN 210952419 U CN210952419 U CN 210952419U CN 201921406510 U CN201921406510 U CN 201921406510U CN 210952419 U CN210952419 U CN 210952419U
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Abstract
The utility model relates to the technical field of rubber production, and discloses a salt cooling device for acetylene polymerization reaction gas, which comprises a salt cooling tower, wherein the top of the salt cooling tower is communicated with a reaction gas exhaust pipe, a wire mesh demister positioned in the salt cooling tower is arranged below the reaction gas exhaust pipe, and the lower part of the salt cooling tower is communicated with a reaction gas inlet pipe; a thickening tower is arranged below the salt cooling tower, the lower part of the thickening tower is communicated with the bottom of the salt cooling tower, the top of the thickening tower is communicated with a NaCl inlet pipe, and the lower part of the thickening tower is communicated with a pump assembly; the bottom of the cooler is communicated with the pump assembly, and the top of the cooler is communicated with a cooling pipe communicated with the upper part of the salt cooling tower. The utility model discloses, be convenient for cool down reaction gas.
Description
Technical Field
The utility model relates to a rubber production technical field, concretely relates to salt cooling device of acetylene polymerization reaction gas.
Background
The preparation of vinyl acetylene by acetylene dimerization is an important operation unit for producing chloroprene rubber by an acetylene method in China, reaction gas (MVA is about 3-5%, most of the rest is acetylene) of the vinyl acetylene is generated, xylene is used as an absorbent to absorb the MVA (vinyl acetylene), and the reaction gas needs to be cooled to about-7 ℃ to ensure the absorption efficiency. In the prior art, a cooler is generally adopted for cooling, while the prior cooler generally uses water cooling or air as a coolant, and the prior cooler has the defects of large gas quantity of reaction gas for generating vinyl acetylene, low required temperature and difficult achievement of the requirement, so that research on cooling of acetylene dimerization reaction gas is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a salt cooling device of acetylene polymerization reaction gas to solve the cooling requirement that current cooler is difficult to reach vinyl acetylene's reaction gas.
In order to achieve the above object, the utility model provides a following technical scheme: a salt cooling device for acetylene polymerization reaction gas comprises a salt cooling tower, wherein the top of the salt cooling tower is communicated with a reaction gas exhaust pipe, a wire mesh demister positioned in the salt cooling tower is arranged below the reaction gas exhaust pipe, and the lower part of the salt cooling tower is communicated with a reaction gas inlet pipe;
a thickening tower is arranged below the salt cooling tower, the lower part of the thickening tower is communicated with the bottom of the salt cooling tower, the top of the thickening tower is communicated with a NaCl inlet pipe, and the lower part of the thickening tower is communicated with a pump assembly;
the bottom of the cooler is communicated with the pump assembly, and the top of the cooler is communicated with a cooling pipe communicated with the upper part of the salt cooling tower.
The utility model discloses a principle and beneficial effect: the reaction gas enters the salt cooling tower from the water cooling tower through the reaction gas inlet pipe, is cooled by NaCl solution sprayed into the salt cooling tower, and is discharged out of the salt cooling tower through the wire mesh demister and the reaction gas exhaust pipe. Because the reaction gas has a small amount of moisture, the NaCl solution can be diluted, the freezing point of the NaCl solution is influenced, and meanwhile, some high-boiling-point substances can be communicated to be cooled down to form a CH phase, the concentration of the NaCl solution can be reduced, so that the NaCl solution after the reaction gas is cooled can be discharged into the thickening tower, and NaCl is discontinuously supplemented into the NaCl solution in the thickening tower, so that the density and the amount of the circulating NaCl solution are ensured.
The pump assembly sends the NaCl solution into the cooler, and the temperature of the NaCl solution is reduced in the cooler to reach-13 ℃, and then the NaCl solution enters the salt cooling tower to reduce the temperature of the reaction gas to-5 to-7 ℃ so as to facilitate the absorption of the reaction gas by the xylene solvent.
The traditional cooler is difficult to reduce the temperature of the reaction gas to-7 ℃, and the temperature of the reaction gas can be reduced to-5 to-7 ℃ through the matching of the salt cooling tower, the thickening tower and the cooler, so that the reaction gas is easier to be absorbed by a xylene solvent.
Further, the lower part of the salt cooling tower is communicated with a CH phase liquid discharge pipe positioned below the reaction gas inlet pipe. Some high boiling point substances in the salt cooling tower are cooled to form a CH phase, and the CH phase is discharged through a CH phase liquid discharge pipe.
Further, the aperture of silk screen demister is 3 ~ 5 um. And removing more than 98% of liquid drops of 3-5 um, avoiding entrainment and achieving the aim of separating the NaCl solution from the reaction gas as far as possible.
Furthermore, a plurality of uniformly distributed tower plates or fillers are arranged in the salt cooling tower along the axial direction of the salt cooling tower, and the fillers or the tower plates are positioned below the wire mesh demister. The reaction gas and NaCl solution are contacted and heat exchanged fully on the packing or tower plate to cool the reaction gas fully.
Further, the device also comprises an absorption tower, and the absorption tower is communicated with the reaction exhaust pipe. The absorption tower is used for absorbing the reaction gas.
Further, a heat insulation layer is arranged outside the cooling pipe. The temperature of the NaCl solution cooled by the cooler is lower than that of air, and the NaCl solution is easy to be subjected to heat exchange with the air to cause the temperature of the NaCl solution to be increased, so that the NaCl solution in the cooling pipe is kept warm through the heat insulation layer.
Further, still include the supply ware, supply ware and NaCl inlet tube intercommunication. The concentration of the NaCl solution in the thickening tower needs to be increased, and NaCl solid particles are added into the thickening tower through a supply device to avoid the concentration of the NaCl solution from being too low.
Further, the supply device comprises a box body with an opening arranged on the upper part, a sealing block with a sealing opening is arranged at the opening, a discharge port communicated with the NaCl inlet pipe is arranged at the bottom of the box body, and a rotary valve is arranged on the NaCl inlet pipe. And opening the rotary valve so as to send the NaCl solid particles in the box body into the thickening tower. The opening is sealed by the sealing block, and the amount of air entering the box body is reduced, so that the probability of the humidity of NaCl solid particles is reduced.
Further, the inner wall of the box body is provided with a moisture-proof layer. The moisture-proof layer prevents moisture in the air from entering the NaCl solid particles.
Further, the CH phase liquid discharge pipe is communicated with a phase splitter. And the CH phase extracted from the salt cooling tower enters a separator through a CH phase liquid discharge pipe for separation treatment.
Drawings
FIG. 1 is an axial view of a salt cooling device for acetylene polymerization reaction gas according to a first embodiment of the present invention;
FIG. 2 is a front partial sectional view of a salt cooling device for acetylene polymerization reaction gas according to a first embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 shows a second embodiment of the dispenser.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the system comprises a cooler 1, a salt cooling tower 2, a wire mesh demister 21, a tower plate 22, a flange plate 23, a reaction gas inlet pipe 24, bolts 25, a thickening tower 3, a centrifugal pump 4, a box body 5, a moisture-proof layer 51, a closed block 52 and a rotary valve 53.
The first embodiment is as follows:
substantially as shown in attached figures 1, 2 and 3, the salt cooling device of the acetylene polymerization reaction gas comprises a salt cooling tower 2, wherein the salt cooling tower 2 is a plate tower in the embodiment.
The upper part of the salt cooling tower 2 is provided with a flange 23, and the flange 23 is fixed on the salt cooling tower 2 through bolts 25. The top in the salt cooling tower 2 is provided with a wire mesh demister 21, and a grid of the wire mesh demister 21 is welded on a flange plate 23. In this embodiment, a wire mesh demister 21 of HG/T21618-1998, which has a pore size of 3um in this embodiment, is used. A plurality of tower plates 22 or fillers which are uniformly distributed along the axial direction of the salt cooling tower 2 are arranged below the wire mesh demister 21, the tower plates 22 are selected in the embodiment, and the tower 22 is a tower plate 22 which is commonly used in the industry, and the details are not repeated here.
The top of the salt cooling tower 2 is communicated with a reaction gas exhaust pipe which is communicated with an absorption tower. The left side of the lower part of the salt cooling tower 2 is communicated with a reaction gas inlet pipe 24, the reaction gas inlet pipe 24 is communicated with the water cooling tower, the right side of the lower part of the salt cooling tower 2 is communicated with a CH-phase liquid discharge pipe, the CH-phase liquid discharge pipe is positioned below the reaction gas inlet pipe 24, and the CH-phase liquid discharge pipe is communicated with a separator (not shown in the figure). MVA is gas, CH phase density: 866Kg/m3, brine density: 1140Kg/m3, MVA gas can not be in the separator, CH and saline can automatically separate in the separator, the upper layer is CH phase solution, the bottom is saline, and the CH phase solution is discharged into the separator from a CH phase liquid discharge pipe.
The thickening tower 3 is arranged below the salt cooling tower 2, the top of the thickening tower 3 is communicated with a NaCl inlet pipe, and the lower part of the thickening tower 3 is communicated with the bottom of the salt cooling tower 2 through a pipeline. Still include the pump package spare, the pump package spare is centrifugal pump 4 in this embodiment, and the inlet of centrifugal pump 4 passes through the lower part intercommunication of pipeline and enrichment tower 3, and the liquid outlet intercommunication of centrifugal pump 4 has cooler 1 and communicates with the bottom of cooler 1, and the top intercommunication of cooler 1 has the cooling tube, and the other end of cooling tube communicates with the upper portion of salt cooling tower 2. The outside of cooling tube is provided with the insulating layer, and the insulating layer is asbestos board insulating layer in this embodiment. The cooler 1 is a shell and tube cooler, which is a common industrial device and is not described in detail herein.
The specific implementation process is as follows:
the reaction gas in the water cooling tower enters the lower part of the salt cooling tower 2 through a reaction gas inlet pipe 24, and the reaction gas flows upwards. The reaction gas can meet the NaCl solution sprayed into the salt cooling tower 2 in the upward flowing process, the NaCl solution absorbs heat to the reaction gas, so that the temperature of the reaction gas is reduced to-5 to-7 ℃, the reaction gas can pass through the wire mesh demister 21 after the temperature is reduced, the wire mesh demister 21 can block most of liquid drops with the particle size larger than 0.9um in the reaction gas, the purpose of separating the reaction gas from the NaCl solution is achieved, and finally the reaction gas can enter the absorption tower through the reaction gas exhaust pipe to complete the cooling of the reaction gas.
Under the action of the tower plate 22, the reaction gas and the NaCl solution are fully contacted on the tower plate for heat exchange, so that the reaction gas is fully cooled.
The NaCl solution finally enters the concentration-increasing tower 3 from the bottom of the salt cooling tower 2, and NaCl solid particles are intermittently supplemented into the concentration-increasing tower 3 through a NaCl inlet pipe, so that the concentration of the NaCl solution is not too low, and the density of the NaCl solution is ensured to be 1140-1160Kg/m 3. The centrifugal pump 4 sends the NaCl solution into the cooler 1 for cooling, so that the temperature of the NaCl solution is reduced to-13 ℃, the NaCl solution is sprayed to the upper part of the salt cooling tower 2 through the cooling pipe, and the NaCl solution is cooled and concentrated through the processes.
In this embodiment, the high boiling point substance in the salt cooling tower 2 can receive the cooling effect of the NaCl solution, thereby forming a CH phase solution, and the CH phase solution is extracted from the salt cooling tower 2 and then enters the separator through a CH phase drain pipe to separate the CH phase solution, and the separation of the CH phase solution is not the problem to be solved in this application, and is not described again.
Example two:
the difference from the first embodiment is that, as shown in fig. 4, a supply device for supplying NaCl solid particles to the enrichment tower 3 is provided, the supply device includes a box 5, a sealing block 52 for opening and sealing the opening is provided on the upper portion of the box 5, a rubber layer is provided on the periphery of the sealing block 52, and when the sealing block 52 extends into the opening, the rubber layer is pressed by the sealing block 52 and the box 5 to deform, thereby sealing the gap between the sealing block 52 and the opening.
The box 5 internal bonding has dampproof course 51, and dampproof course 51 is current waterproof ventilated membrane in this embodiment, and box 5 bottom is provided with the bin outlet, and the bin outlet enters the pipe intercommunication with NaCl, and the diapire slope of box 5 is downward and towards the bin outlet. NaCl advances to be provided with rotary valve 53 on the pipe, and the model is: y801-4.
The specific implementation process is as follows:
initially, the rotary valve 53 is closed and a sufficient amount of solid particles of NaCl are fed into the tank 5, and then the closing block 52 is inserted into the opening to close the tank 5.
When NaCl solid particles need to be discharged, the rotary valve 53 is opened, the NaCl solid particles enter the thickening tower 3 through the NaCl inlet pipe, then the rotary valve 53 is closed, and the discharging of the NaCl solid particles is stopped. NaCl solid particles are supplied to the thickening tower 3 through a supply device, so that the concentration of the NaCl solution in the thickening tower 3 is increased conveniently.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The technology, shape and construction parts which are not described in the present invention are all known technology.
Claims (10)
1. The utility model provides a salt cooling device of acetylene polymerization reaction gas which characterized in that: the device comprises a salt cooling tower, wherein the top of the salt cooling tower is communicated with a reaction gas exhaust pipe, a wire mesh demister positioned in the salt cooling tower is arranged below the reaction gas exhaust pipe, and the lower part of the salt cooling tower is communicated with a reaction gas inlet pipe;
a thickening tower is arranged below the salt cooling tower, the lower part of the thickening tower is communicated with the bottom of the salt cooling tower, the top of the thickening tower is communicated with a NaCl inlet pipe, and the lower part of the thickening tower is communicated with a pump assembly;
the bottom of the cooler is communicated with the pump assembly, and the top of the cooler is communicated with a cooling pipe communicated with the upper part of the salt cooling tower.
2. The salt cooling device of acetylene polymerization reaction gas according to claim 1, characterized in that: the lower part of the salt cooling tower is communicated with a CH phase liquid discharge pipe positioned below the reaction gas inlet pipe.
3. The salt cooling device of acetylene polymerization reaction gas according to claim 1, characterized in that: the aperture of the silk screen demister is 3-5 um.
4. The salt cooling device of acetylene polymerization reaction gas according to any one of claims 1 to 3, characterized in that: a plurality of uniformly distributed tower plates or fillers are arranged in the salt cooling tower along the axial direction of the salt cooling tower, and the fillers or the tower plates are positioned below the wire mesh demister.
5. The salt cooling device of acetylene polymerization reaction gas according to claim 4, characterized in that: the absorption tower is communicated with the reaction exhaust pipe.
6. The salt cooling device of acetylene polymerization reaction gas according to claim 5, characterized in that: and a heat insulation layer is arranged outside the cooling pipe.
7. The salt cooling device of acetylene polymerization reaction gas according to claim 6, characterized in that: also comprises a supply device which is communicated with the NaCl inlet pipe.
8. The salt cooling device of acetylene polymerization reaction gas according to claim 7, characterized in that: the supply device comprises a box body with an opening arranged on the upper part, a sealing block with a sealing opening arranged on the opening, a discharge opening communicated with a NaCl inlet pipe arranged at the bottom of the box body, and a rotary valve arranged on the NaCl inlet pipe.
9. The salt cooling device of acetylene polymerization reaction gas according to claim 8, characterized in that: the inner wall of the box body is provided with a moisture-proof layer.
10. The salt cooling device of acetylene polymerization reaction gas according to claim 2, characterized in that: and the CH phase liquid discharge pipe is communicated with a phase splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921406510.3U CN210952419U (en) | 2019-08-27 | 2019-08-27 | Salt cooling device for acetylene polymerization reaction gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921406510.3U CN210952419U (en) | 2019-08-27 | 2019-08-27 | Salt cooling device for acetylene polymerization reaction gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210952419U true CN210952419U (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921406510.3U Active CN210952419U (en) | 2019-08-27 | 2019-08-27 | Salt cooling device for acetylene polymerization reaction gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210952419U (en) |
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2019
- 2019-08-27 CN CN201921406510.3U patent/CN210952419U/en active Active
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