CN212818969U - Tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation - Google Patents
Tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation Download PDFInfo
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- CN212818969U CN212818969U CN202021559049.8U CN202021559049U CN212818969U CN 212818969 U CN212818969 U CN 212818969U CN 202021559049 U CN202021559049 U CN 202021559049U CN 212818969 U CN212818969 U CN 212818969U
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Abstract
The utility model belongs to the technical field of chemical industry equipment, concretely relates to tail gas processing apparatus of ethylbenzene dehydrogenation styrene system. Including reactor, heat exchanger, oil-water separation jar, entry branch fluid reservoir, tail gas compressor, export branch fluid reservoir and absorption tower, the tail gas exit linkage heat exchanger of reactor, the exit linkage quench cooler of heat exchanger, the tertiary heat transfer device of exit linkage of quench cooler, the gaseous phase exit linkage of tertiary heat transfer device enters the air inlet of branch fluid reservoir, the demister sets up in the entry liquid-separating jar, tail gas compressor is connected to the gas outlet of entry liquid separator, the exit linkage export branch fluid reservoir of tail gas compressor, export liquid-separating jar passes through second grade heat transfer device and connects the absorption tower, the usable branch fluid reservoir of the device carries out gas-liquid separation to tail gas, avoid containing styrene liquid to aggregate in tail gas treatment equipment and influence the normal operating that tail gas was handled.
Description
Technical Field
The utility model belongs to the technical field of chemical industry equipment, concretely relates to tail gas processing apparatus of ethylbenzene dehydrogenation styrene system.
Background
Styrene SM is an important monomer of synthetic resin, ion exchange resin and synthetic rubber, can be used for producing styrene butadiene rubber, polystyrene and foamed polystyrene, and can also be copolymerized with other monomers to produce engineering plastics with various applications. The production method mainly comprises two methods of ethylbenzene catalytic dehydrogenation and ethylbenzene co-oxidation, wherein more than 90% of the methods are prepared by ethylbenzene catalytic dehydrogenation.
Compressor device is widely used in technical field such as oil, chemical industry, and most sets up in environment such as high temperature high pressure, flammable and explosive to most compressors need long-term operation in order to cooperate the factory production demand. The tail gas treatment process for preparing styrene by ethylbenzene dehydrogenation also needs a compressor to treat the tail gas. Because the tail gas generated in the production process of preparing the styrene by ethylbenzene dehydrogenation is a mixture with unseparated gas and liquid, if the mixture containing liquid directly enters a compressor, the following defects exist: firstly, increase compressor work load, secondly easily polymerize in compressor or compressor outlet pipeline and follow-up tail gas treatment system after the styrene-containing liquid gets into the compressor, further corrode, damage equipment and influence its work efficiency to influence the tail gas treatment effect.
Therefore, in order to ensure that the treatment effect of the tail gas generated in the styrene production is better and that each device in the tail gas treatment is operated safely and efficiently for a long time, the inlet tail gas of the compressor needs to be subjected to gas-liquid separation design and transformation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned problem, the utility model aims at providing a tail gas processing apparatus of ethylbenzene dehydrogenation system styrene, the device is usable divides the fluid reservoir to carry out gas-liquid separation to tail gas, avoids containing styrene liquid polymerization in tail gas treatment facility to influence the normal operating that the tail gas was handled.
The utility model discloses a realize through following technical scheme: the ethylbenzene dehydrogenation tail gas treatment device comprises a reactor, a heat exchanger, an oil-water separation tank, an inlet liquid separation tank, a tail gas compressor, an outlet liquid separation tank and an absorption tower, and is characterized in that a tail gas outlet of the reactor is connected with the heat exchanger, an outlet of the heat exchanger is connected with a quencher, an outlet of the quencher is connected with a three-stage heat exchange device, a gas phase outlet of the three-stage heat exchange device is connected with an air inlet of the inlet liquid separation tank, an air inlet pipe communicated with the air inlet of the inlet liquid separation tank is further arranged in the inlet liquid separation tank, the tail end of the air inlet pipe extends to the lower part of the demister, the demister is arranged in the inlet liquid separation tank, a liquid outlet is formed in the bottom of the; the inlet liquid separation tank gas outlet is arranged above the demister, the gas outlet of the inlet liquid separator is connected with the tail gas compressor, the outlet of the tail gas compressor is connected with the outlet liquid separation tank, the outlet liquid separation tank is connected with the absorption tower through the secondary heat exchange device, and the top of the absorption tower is provided with a tail gas discharge port.
Preferably, the three-stage heat exchange device comprises three heat exchangers connected in sequence, and a liquid phase outlet of each heat exchanger is connected with an oil-water separation tank.
Preferably, the secondary heat exchange device comprises two heat exchangers connected in sequence, and the first heat exchanger is also connected with a tail gas compressor through a circulating pipeline.
Preferably, the demister is made of a defoaming net.
The utility model has the advantages that: the utility model discloses an intake pipe in entry knockout drum, the design of the difference in height of demister and gas outlet, make the tail gas that gets into entry knockout drum must pass through the demister, make the liquid component that contains in the tail gas form great liquid drop through the demister, assemble in entry knockout drum bottom after jar wall is touch to great liquid drop, arrange to oil-water separation jar through the fluid-discharge tube, thereby guarantee that tail gas compressor's imported gas does not contain styrene liquid, the risk of equipment polymerization at tail gas compressor and thereafter containing styrene liquid has been eliminated, reduce tail gas compressor's load, and the work efficiency is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure of the inlet liquid separation tank of the present invention;
in the attached figure, a reactor 1, a heat exchanger 2, a quencher 3, an oil-water separating tank 4, a liquid discharge pipe 41, a liquid separating tank 5, an air inlet pipe 51, a liquid separating tank air outlet 52, a demister 53, a tail gas compressor 6, a liquid separating tank 7 and an absorption tower 8 are arranged.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, a tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation comprises a reactor 1, a heat exchanger 2, an oil-water separation tank 4, an inlet liquid separation tank 5, a tail gas compressor 6, an outlet liquid separation tank 7 and an absorption tower 8, wherein a tail gas outlet of the reactor 1 is connected with the heat exchanger 2 through a pipeline, an outlet of the heat exchanger 2 is connected with a quencher 3 through a pipeline, an outlet of the quencher 3 is connected with a third-stage heat exchange device through a pipeline, a gas phase outlet of the third-stage heat exchange device is connected with an air inlet of the inlet liquid separation tank 5 through a pipeline, as shown in figure 2, an air inlet pipe 51 communicated with the air inlet of the inlet liquid separation tank 5 is further arranged in the inlet liquid separation tank 5, the tail end of the air inlet pipe 51 extends to the lower part of a demister 53 to enable the tail gas to be discharged after passing through the demister 53, the demister 53 is installed in the inlet liquid separation tank, the liquid outlet is used for discharging larger liquid drops formed in the tail gas by the demister 53 and is connected with the oil-water separation tank 4 through a liquid outlet pipe 41; an inlet liquid separating tank gas outlet 52 is arranged above the demister 53, the gas outlet of the inlet liquid separating tank is connected with the tail gas compressor 6 through a pipeline, the outlet of the tail gas compressor 6 is connected with an outlet liquid separating tank 7 through a pipeline, the outlet liquid separating tank 7 is connected with the absorption tower 8 through a second-stage heat exchange device through a pipeline, and a tail gas discharge port is arranged at the top of the absorption tower 8.
The three-stage heat exchange device comprises three heat exchangers 2 which are sequentially connected, namely, a gas-phase outlet of the first heat exchanger 2 is connected with an inlet of the second heat exchanger 2, a gas-phase outlet of the second heat exchanger 2 is connected with an inlet of the third heat exchanger 2, a gas-phase outlet of the third heat exchanger 2 is connected with an inlet liquid separation tank 5, and a liquid-phase outlet of each heat exchanger 2 is connected with an oil-water separation tank 4.
The second-stage heat exchange device comprises two heat exchangers 2 which are sequentially connected, and the first heat exchanger 2 is also connected with a tail gas compressor 6 through a circulating pipeline.
The demister 53 is made of a defoaming mesh, i.e., atomized styrene is coalesced by the defoaming mesh, and remains in the inlet liquid separation tank 5 and is discharged.
In the treatment of tail gas generated in the preparation of styrene by ethylbenzene dehydrogenation, firstly, the tail gas of a reactor 1 is sent to a heat exchanger 2 for heat exchange, then sent to a quencher 3 for cooling again after heat exchange, then subjected to multiple heat exchange and cooling by a three-stage heat exchange device, liquid generated in the tail gas after heat exchange is discharged to an oil-water separation tank 4 for oil-water separation, gas enters an inlet liquid separation tank 5, an air inlet pipe is arranged in the inlet liquid separation tank 5, the tail gas is sent to the bottom of the inlet liquid separation tank 5 through the air inlet pipe, then formed into large liquid drops through a demister 53, the liquid drops are gathered to the tank bottom along the inner wall of the tank and discharged to the oil-water separator through a liquid discharge pipe, the tail gas with the liquid removed is discharged to an outlet liquid separation tank 7 through a tail gas compressor 6 from an outlet of the inlet liquid separation tank.
When utilizing this device to carry out tail gas treatment, not only can improve styrene tail gas compressor entry and divide liquid efficiency, reduce compressor load and contain the polymerization of styrene liquid in equipment, can also effectively improve tail gas treatment efficiency, increase the economic benefits of mill.
Other technical features than those described in the specification are known to those skilled in the art.
Claims (4)
1. A tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation comprises a reactor (1), a heat exchanger (2), an oil-water separation tank (4), an inlet liquid separation tank (5), a tail gas compressor (6), an outlet liquid separation tank (7) and an absorption tower (8), and is characterized in that a tail gas outlet of the reactor (1) is connected with the heat exchanger (2), an outlet of the heat exchanger (2) is connected with a quencher (3), an outlet of the quencher (3) is connected with a three-stage heat exchange device, a gas phase outlet of the three-stage heat exchange device is connected with an air inlet of the inlet liquid separation tank (5), an air inlet pipe (51) communicated with the air inlet of the inlet liquid separation tank (5) is further arranged in the inlet liquid separation tank (5), the tail end of the air inlet pipe (51) extends to the lower part of a demister (53), the demister (53) is arranged in the inlet liquid separation tank (5), and a liquid outlet is arranged at the, the liquid outlet is connected with the oil-water separation tank (4) through a liquid outlet pipe (41);
an inlet liquid separation tank gas outlet (52) is arranged above the demister (53), the inlet liquid separation tank gas outlet (52) is connected with a tail gas compressor (6), an outlet of the tail gas compressor (6) is connected with an outlet liquid separation tank (7), the outlet liquid separation tank (7) is connected with an absorption tower (8) through a secondary heat exchange device, and a tail gas discharge port is arranged at the top of the absorption tower (8).
2. The tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation according to claim 1, wherein the three-stage heat exchange device comprises three heat exchangers (2) connected in sequence, and a liquid phase outlet of each heat exchanger (2) is connected with an oil-water separation tank (4).
3. The tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation according to claim 1, wherein the secondary heat exchange device comprises two heat exchangers (2) connected in sequence, and the first heat exchanger (2) is further connected with a tail gas compressor (6) through a circulating pipeline.
4. The apparatus for processing tail gas from ethylbenzene dehydrogenation to styrene as claimed in claim 1, wherein the demister (53) is made of a defoaming net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021559049.8U CN212818969U (en) | 2020-07-31 | 2020-07-31 | Tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021559049.8U CN212818969U (en) | 2020-07-31 | 2020-07-31 | Tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation |
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| Publication Number | Publication Date |
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| CN212818969U true CN212818969U (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021559049.8U Active CN212818969U (en) | 2020-07-31 | 2020-07-31 | Tail gas treatment device for preparing styrene by ethylbenzene dehydrogenation |
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| CN (1) | CN212818969U (en) |
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- 2020-07-31 CN CN202021559049.8U patent/CN212818969U/en active Active
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