CN208736034U - A kind of polypropylene tail gas recovery device - Google Patents
A kind of polypropylene tail gas recovery device Download PDFInfo
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- CN208736034U CN208736034U CN201821324780.5U CN201821324780U CN208736034U CN 208736034 U CN208736034 U CN 208736034U CN 201821324780 U CN201821324780 U CN 201821324780U CN 208736034 U CN208736034 U CN 208736034U
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- heat exchanger
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Abstract
The utility model discloses a kind of polypropylene tail gas recovery devices, including sequentially connected compression condensation unit, cryogenic separation unit and film separation unit.The compression condensation unit, including at least one sequentially connected tail-gas compressor, a recirculated water cooling condenser and a room temperature gas-liquid separator；The cryogenic separation unit, including at least one sequentially connected efficient multi-channel heat exchanger and a low temperature gas-liquid separator；The film separation unit, including at least one membrane separator.The present apparatus passes through deep cooling-UF membrane coupling technique, it can be achieved that 99% or more propylene recovery rate in small-entity polypropylene device exhaust, recycles 99% or more nitrogen gas purity.Cryogenic separation unit is placed in film separation unit upstream by the present apparatus, mitigates film separation unit load；The tolerance that film per-meate side is back to compressor reduces, and compressor power consumption reduces, while further reduced system operation energy consumption as refrigerant using the propylene self-expanding in unstripped gas.
Description
Technical field
The utility model relates to polypropylene fields, and in particular to propylene and nitrogen in a kind of polypropylene production process emission
The recyclable device of gas.
Background technique
In batch liquid bulk polymerization (hereinafter referred to as " small scale bulk ") polypropylene production process, what flash vaporization kettle flashed off
Tail gas, main component are propylene and nitrogen, and wherein propylene content accounts for about 60%~90%.Traditional compression condensation recovery process,
Tail gas is after gas holder is collected, and by compressor compresses to 1.8MPa~2.0MPa, then is cooled by water liquid separation recovery section after device condensation
Propylene.Usual condensation temperature is 20 DEG C~40 DEG C, is limited by vapor-liquid equilibrium condition, in fixed gas still containing 40% (V/V)~
The propylene monomer of the left and right 70% (V/V).By taking 20,000 tons/year of small-entity polypropylene device as an example, third in the fixed gas that discharges every year
Alkene monomer is about 300 tons~500 tons, therefore carries out recycling with high economic value to this part propylene.
US5769927 proposes further to recycle the propylene in fixed gas using membrane separation technique.Utilize organic hydrocarbon seperation film
The characteristics of preferentially penetrating propylene permeates propylene in film and surveys enrichment, and obtained rich propylene stream is recycled back to back to compression entrance
Receive propylene.Compression condensation-the membrane separating process can make the rate of recovery of propylene in small-entity polypropylene tail gas reach 95% or more, but
Since the rich propylene stream of film is all returned to compression condensation part, compression and condensation tolerance after causing circulation are initial tolerance
1.5 times~3 times, film infiltration survey enrichment the more former fixed gas of density of propylene generally improves 10%~15% so that compression and make
The investment of cool equipment and energy consumption all dramatically increase, and reduce the economy of the process.
Summary of the invention
In view of the deficiency of the prior art, the utility model discloses a kind of polypropylene tail gas recovery device,
By the combination of compression condensation unit, cryogenic separation unit and film separation unit, propylene and nitrogen in polypropylene tail gas are realized
High energy efficiency recycling.
The utility model provides a kind of polypropylene tail gas recovery device, and described device connects along logistics direction, including successively
Compression condensation unit, cryogenic separation unit and the film separation unit connect；
The compression condensation unit, including at least one sequentially connected tail-gas compressor, a recirculated water cooling condenser and
One room temperature gas-liquid separator；It is configured as compressing polypropylene tail gas, cool down and gas-liquid separating treatment, export recycling
Liquid propylene logistics and normal temperature compressed air-flow；
The cryogenic separation unit, including at least one sequentially connected efficient multi-channel heat exchanger and a low temperature gas-liquid
Separator；It is configured as carrying out deep cooling to the normal temperature compressed air-flow that compression condensation unit exports and gas-liquid separating treatment, output follows
The propylene stream of ring and the poor hydrocarbon nitrogen stream of room temperature；
The room temperature gas-liquid separator of the entrance and compression condensation unit of the efficient multi-channel heat exchanger channel B-B
Top exit is connected；The outlet of the efficient multi-channel heat exchanger channel B-B is connected with the entrance of the low temperature gas-liquid separator；
The entrance of the efficient multi-channel heat exchanger channel C-C is connected with the outlet at bottom of the low temperature gas-liquid separator；
The outlet of the efficient multi-channel heat exchanger channel C-C is connected with the tail-gas compressor entrance of the compression condensation unit；It is described
The entrance of efficient multi-channel heat exchanger channel C-C and configuration section on the pipeline that is connected of the outlet at bottom of the low temperature gas-liquid separator
Flow expansion valve C；
The entrance of the efficient multi-channel heat exchanger channel A-A is connected with the top exit of the low temperature gas-liquid separator；
Match on the entrance of the efficient multi-channel heat exchanger channel A-A and the pipeline that is connected of the top exit of the low temperature gas-liquid separator
Set throttle expansion valve A；
The film separation unit, including at least one membrane separator are configured as the room temperature exported to cryogenic separation unit
Poor hydrocarbon nitrogen stream carry out separating treatment, export rich propylene stream and rich nitrogen stream；
The outlet phase of the entrance of the membrane separator and the efficient multi-channel heat exchanger channel A-A of the cryogenic separation unit
Even；The infiltration side outlet of the membrane separator is connected with the entrance of the tail-gas compressor of the compression condensation unit.
Further, in the above-mentioned technical solutions, the efficient multi-channel heat exchanger is selected from plate-fin heat exchanger, around tubular type
Heat exchanger it is one or more.
Further, in the above-mentioned technical solutions, the membrane separator includes hydrocarbon membrane separation assemblies, the hydrocarbon UF membrane group
Part includes hydrocarbon film, and the hydrocarbon film is that the infiltration rate of hydrocarbon component is higher than the film of hydrogen, nitrogen component, preferred rubber state macromolecule
Film, such as organosiloxane class polymeric membrane.The structure of the hydrocarbon membrane separation assemblies is selected from spiral membrane module, plate and frame film group
One of part and hollow fiber film assembly are a variety of.
The utility model has the advantages that compared with prior art
1, by deep cooling-UF membrane coupling technique, the rate of recovery of 99% or more propylene in polypropylene tail gas is realized, further
Reduce polypropylene plant unit consumption.
2, it realizes nitrogen purification, after purification more than nitrogen gas purity 99% (V/V), meets and requirement is recycled；
3, film infiltration survey be back to compressor rich propylene stream amount reduce, and wherein density of propylene be 80% (V/V)~
90% (V/V) solves the problems, such as that the tolerance that rich propylene stream is back to compressor in the prior art is bigger than normal, density of propylene is not high,
Greatly reduce compressor power consumption；
4, multiply logistics is exchanged heat in heat exchanger, is changed as refrigerant using the propylene self-expanding in unstripped gas
The thermal efficiency is high, and does not consume water, electricity and steam.
5. cryogenic separation unit to be placed in the upstream of film separation unit, reduce the hydrocarbon content into film separation unit,
It is conducive to extend the service life of film.
6, equipment investment is few, operation energy consumption is low, occupied area is small.
Detailed description of the invention
Fig. 1 is the process flow diagram of the utility model polypropylene tail gas recovery device.
In figure, 100, compression condensation unit；110, tail-gas compressor；120, recirculated water cooling condenser；130, room temperature gas-liquid point
From device；200, cryogenic separation unit；210, efficient multi-channel heat exchanger；220, low temperature gas-liquid separator；230, throttle expansion valve
C；240, economizer expansion valve A；300, film separation unit；310, membrane separator；10, pipeline a；11, pipeline b；12, pipeline c；13,
Pipeline d；14, pipeline e；15, pipeline f；16, pipeline g；17, pipeline h；18, pipeline i；19, pipeline j；20, pipeline k；21, pipeline
l。
Specific embodiment
Following nonlimiting examples can make those skilled in the art that the utility model be more fully understood, but
The utility model is not limited in any way.
Now in conjunction with attached drawing, the utility model is described in further detail.
Embodiment 1
As shown in Fig. 1, a kind of polypropylene tail gas recovery device provided by the invention, described device is along logistics direction, packet
Include sequentially connected compression condensation unit 100, cryogenic separation unit 200 and film separation unit 300；
Compression condensation unit 100 successively includes that 110, recirculated water cooling condensers 120 of a tail-gas compressor and one are normal
Wet liquid/gas separator 130.Tail gas in polypropylene production process, a10 is connected to the entrance of tail-gas compressor 110 by the road.Tail
The pressure rise of gas to 1.5MPaG~2.5MPaG is met the behaviour of postorder cryogenic separation and UF membrane by air compressor 110
Make pressure requirements.B11 is connected to recirculated water cooling condenser 120 to compressed gas by the road, by compressed gas cooling to often
Temperature, then c12 is connected to the progress gas-liquid separation of room temperature gas-liquid separator 130 by the road.130 bottom of room temperature gas-liquid separator obtains
The liquid propylene logistics of recycling is via pipeline l21 output device, the normal temperature compressed air-flow that obtains at the top of room temperature gas-liquid separator 130
Via pipeline d13 connection cryogenic separation unit 200.
Cryogenic separation unit 200, including an efficient multi-channel heat exchanger 210 and a low temperature gas-liquid separator 220.From
The normal temperature compressed air-flow d13 connection efficient multi-channel heat exchanger 210 by the road that compression condensation unit 100 exports, passes through thermal medium
After the B-B of channel, temperature is gradually decrease to -20 DEG C~-60 DEG C, then the low temperature gas-liquid separator of e14 connection by the road 220 carries out gas-liquid
Separation.The liquid propylene that 220 bottom of low temperature gas-liquid separator obtains returns by the road after the throttle expansion valve C230 decompression on g16
Efficient multi-channel heat exchanger 210 is returned, by cold medium channel C-C, carries out heat exchange with thermal medium therein, and is provided for it cold
Amount, the propylene stream (more than density of propylene general 95% (V/V)) recycled are back to compression condensation list via pipeline i18
110 entrance of tail-gas compressor of member 100.The poor hydrocarbon nitrogen stream of the low temperature obtained at the top of low temperature gas-liquid separator 220, by the road
After throttle expansion valve A240 decompression on f15, efficient multi-channel heat exchanger 210 is returned to, by cold medium channel A-A, and wherein
Thermal medium carry out heat exchange, and provide cooling capacity for it, obtain the poor hydrocarbon nitrogen stream of room temperature, via pipeline h17 junctional membrane point
From unit 300.
Membrane separator unit 300, the membrane separator 310 including a built-in hydrocarbon membrane separation assemblies.From cryogenic separation unit
When the poor hydrocarbon nitrogen stream of the room temperature of 200 outputs passes through membrane separator 310, propylene preferentially penetrates hydrocarbon film, permeates lateral enrichment in film
Rich propylene stream is obtained, 110 entrance of tail-gas compressor of compression condensation unit 100 is back to via pipeline j19, film retention side obtains
The rich nitrogen stream (more than nitrogen gas purity 99% (V/V)) arrived is recycled via pipeline k20 output device.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is practical according to this in the technical scope that the utility model discloses
Novel technical solution and its design is subject to equivalent substitution or change, should be covered within the scope of the utility model.
Claims (5)
1. a kind of polypropylene tail gas recovery device, described device is along logistics direction, including sequentially connected compression condensation unit, depth
Cold separative unit and film separation unit；
The compression condensation unit, including at least one sequentially connected tail-gas compressor, a recirculated water cooling condenser and one
Room temperature gas-liquid separator；
The cryogenic separation unit, including at least one sequentially connected efficient multi-channel heat exchanger and a low temperature gas-liquid separation
Device；
The top of the room temperature gas-liquid separator of the entrance and compression condensation unit of the efficient multi-channel heat exchanger channel B-B
Outlet is connected；The outlet of the efficient multi-channel heat exchanger channel B-B is connected with the entrance of the low temperature gas-liquid separator；
The entrance of the efficient multi-channel heat exchanger channel C-C is connected with the outlet at bottom of the low temperature gas-liquid separator；It is described
The outlet of efficient multi-channel heat exchanger channel C-C is connected with the tail-gas compressor entrance of the compression condensation unit；It is described efficient
The entrance of multi-channel heat exchanger channel C-C and configuration throttling on the pipeline that is connected of the outlet at bottom of the low temperature gas-liquid separator are swollen
Swollen valve C；
The entrance of the efficient multi-channel heat exchanger channel A-A is connected with the top exit of the low temperature gas-liquid separator；It is described
The entrance of efficient multi-channel heat exchanger channel A-A and configuration section on the pipeline that is connected of the top exit of the low temperature gas-liquid separator
Flow expansion valve A；
The film separation unit, including at least one membrane separator；The entrance of the membrane separator and the cryogenic separation unit
Efficient multi-channel heat exchanger channel A-A outlet be connected；The infiltration side outlet of the membrane separator and the compression condensation list
The entrance of the tail-gas compressor of member is connected.
2. a kind of polypropylene tail gas recovery device according to claim 1, it is characterised in that: the efficient multi-channel heat exchange
Device be selected from plate-fin heat exchanger, wound tube heat exchanger it is one or more.
3. a kind of polypropylene tail gas recovery device according to claim 1, it is characterised in that: the membrane separator includes hydrocarbon
Membrane separation assemblies, the hydrocarbon membrane separation assemblies include hydrocarbon film, and the hydrocarbon film is selected from rubbery state polymeric membrane.
4. a kind of polypropylene tail gas recovery device according to claim 3, it is characterised in that: the rubbery state polymeric membrane
Selected from organosiloxane class polymeric membrane.
5. a kind of polypropylene tail gas recovery device according to claim 3, it is characterised in that: the hydrocarbon membrane separation assemblies choosing
From one of spiral membrane module, plate and frame module and hollow fiber film assembly or a variety of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821324780.5U CN208736034U (en) | 2018-08-16 | 2018-08-16 | A kind of polypropylene tail gas recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821324780.5U CN208736034U (en) | 2018-08-16 | 2018-08-16 | A kind of polypropylene tail gas recovery device |
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| Publication Number | Publication Date |
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| CN208736034U true CN208736034U (en) | 2019-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821324780.5U Active CN208736034U (en) | 2018-08-16 | 2018-08-16 | A kind of polypropylene tail gas recovery device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538480A (en) * | 2019-09-25 | 2019-12-06 | 上海电气集团股份有限公司 | condensing system and condensing method |
| CN114478170A (en) * | 2022-02-23 | 2022-05-13 | 大连理工大学 | Membrane coupling polypropylene tail gas recovery process for reducing propane accumulation |
-
2018
- 2018-08-16 CN CN201821324780.5U patent/CN208736034U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538480A (en) * | 2019-09-25 | 2019-12-06 | 上海电气集团股份有限公司 | condensing system and condensing method |
| CN114478170A (en) * | 2022-02-23 | 2022-05-13 | 大连理工大学 | Membrane coupling polypropylene tail gas recovery process for reducing propane accumulation |
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