CN212757588U - Free water olefin separation system - Google Patents
Free water olefin separation system Download PDFInfo
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- CN212757588U CN212757588U CN202020692587.8U CN202020692587U CN212757588U CN 212757588 U CN212757588 U CN 212757588U CN 202020692587 U CN202020692587 U CN 202020692587U CN 212757588 U CN212757588 U CN 212757588U
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Abstract
The utility model discloses a free water olefin separation system, which comprises a propylene low-pressure recovery system, a crude propylene storage tank, a free water separation system and a membrane separation system, wherein the liquid phase outlet of the crude propylene storage tank is connected with the free water separation system, and impurities are filtered and water is separated through the free water separation system; and a gas phase outlet of the crude propylene storage tank is connected with a membrane separation system, the membrane separation system is connected with a propylene low-pressure recovery system after separation treatment, and the circulation is realized by connecting the propylene low-pressure recovery system with the crude propylene storage tank. The utility model has the advantages that: adopt free water separation system, realize the filter core of two sets of different functions, coalescence filter core and separation filter core promptly, when retrieving propylene and flowing through filtering separator, in its inside through filter, coalescence, subside, four processes of separation, realize filtering impurity and separation moisture, collect two kinds of functions in an organic whole of precision filtration, high-efficient dehydration.
Description
Technical Field
The utility model relates to a chemical industry raw materials splitter technical field, concretely relates to free water alkene piece-rate system.
Background
The polypropylene device adopts an SPG process as a polymerization process, and propylene is used as a raw material, three agents are added, and the polypropylene is polymerized and produced at a specific temperature and pressure. The product contains gas-phase propylene and propane, and the propylene in the product is recovered by adding steam to replace, so that the recovered propylene contains moisture, and cannot be directly recycled in a device, thereby influencing the conversion rate of propylene and polypropylene.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a free water olefin separation system with reasonable structural design.
The technical scheme of the utility model as follows:
a free water olefin separation system is characterized by comprising a propylene low-pressure recovery system, a crude propylene storage tank, a free water separation system and a membrane separation system, wherein a liquid phase outlet of the crude propylene storage tank is connected with the free water separation system, and impurities are filtered and water is separated through the free water separation system; and a gas phase outlet of the crude propylene storage tank is connected with a membrane separation system, the membrane separation system is connected with a propylene low-pressure recovery system after separation treatment, and the circulation is realized by connecting the propylene low-pressure recovery system with the crude propylene storage tank.
The free water-olefin separation system is characterized by comprising a first liquid phase pipeline, a second liquid phase pipeline, a liquid phase main pipeline, a crude propylene filter and a water coalescer, wherein a first conveying pump is arranged on the first liquid phase pipeline, a second conveying pump is arranged on the second liquid phase pipeline, the first liquid phase pipeline and the second liquid phase pipeline are respectively communicated with the liquid phase main pipeline and are connected with the crude propylene filter through the liquid phase main pipeline, the crude propylene filter is connected with the water coalescer, liquid phase substances in the liquid phase main pipeline are recycled after being filtered out impurities through the crude propylene filter and then being separated from water through the water coalescer, and the separated impurities at the bottoms of the crude propylene filter and the water coalescer are discharged to a torch.
The free water-olefin separation system is characterized by comprising a gas phase main pipeline, a first filter, a second filter, a heating heat exchanger and a membrane separation assembly, wherein the gas phase main pipeline is connected with the first filter, the first filter is connected with the second filter, the second filter is connected with the heating heat exchanger, the heating heat exchanger is connected with the membrane separation assembly, a gas phase substance in the gas phase main pipeline filters physical impurities through the first filter and the second filter, the gas phase substance enters the heating heat exchanger to evaporate moisture in the gas phase substance, then enters the membrane separation assembly to realize separation of gas phase propylene, and finally is introduced into a propylene low-pressure recovery system, and the separated impurities of the membrane separation assembly are discharged to a torch.
The free water-olefin separation system is characterized in that a differential pressure feedback system is arranged on the liquid phase main pipeline at the front end of the crude propylene filter and the rear end of the water coalescer, and comprises a first pressure gauge, a second pressure gauge and a differential pressure interlocking alarm.
The free water-olefin separation system is characterized in that the membrane separation assembly comprises a first membrane separation device, a second membrane separation device, a third membrane separation device, a fourth membrane separation device, a fifth membrane separation device and a sixth membrane separation device, wherein the first membrane separation device, the second membrane separation device, the third membrane separation device, the fourth membrane separation device, the fifth membrane separation device and the sixth membrane separation device are arranged on a gas phase main pipeline in parallel.
The utility model has the advantages that:
1) adopt free water separation system, realize the filter core of two sets of different functions, coalescence filter core and separation filter core promptly, when retrieving propylene and flowing through filtering separator, in its inside through filter, coalescence, subside, four processes of separation, realize filtering impurity and separation moisture, collect two kinds of functions in an organic whole of precision filtration, high-efficient dehydration.
2) The novel 'reverse' selective polymer composite membrane adopting the membrane separation system achieves the separation purpose by preferentially adsorbing and permeating under the promotion of certain pressure difference according to the difference of the dissolving and diffusing performances of different gas molecules in the membrane and the difference of the penetrating performances with different molecular sizes.
Drawings
Fig. 1 is a schematic structural diagram of the overall system of the present invention;
FIG. 2 is a schematic diagram of the free water separation system of the present invention;
FIG. 3 is a schematic structural view of a membrane separation system according to the present invention;
in the figure: 1-propylene low-pressure recovery system, 2-crude propylene storage tank, 3-free water separation system, 301-first liquid phase pipeline, 302-first transfer pump, 303-second liquid phase pipeline, 304-second transfer pump, 305-liquid phase main pipeline, 306-first pressure gauge, 307-differential pressure interlock alarm, 308-second pressure gauge, 309-crude propylene filter, 310-water coalescer, 4-membrane separation system, 401-gas phase main pipeline, 402-first filter, 403-second filter, 404-heating heat exchanger, 405-condensate water pipeline, 406-steam pipeline, 407-first membrane separation device, 408-second membrane separation device, 409-third membrane separation device, 410-fourth membrane separation device, 411-fifth membrane separation device, 412-sixth membrane separation device.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1-3, a free water olefin separation system comprises four parts, namely a propylene low-pressure recovery system 1, a crude propylene storage tank 2, a free water separation system 3 and a membrane separation system 4;
a liquid phase outlet of the crude propylene storage tank 2 is connected with a free water separation system 3, and impurities are filtered and water is separated through the free water separation system 3; the gas phase outlet of the crude propylene storage tank 2 is connected with the membrane separation system 4, the membrane separation system 4 is connected with the propylene low-pressure recovery system 1 after separation treatment, and is connected with the crude propylene storage tank 2 through the propylene low-pressure recovery system 1 to realize circulation. The propylene low-pressure recovery system 1 is used for recovering gas-phase propylene, a compression pump and a heat exchanger are arranged between the propylene low-pressure recovery system 1 and the crude propylene storage tank 2, and the gas-phase propylene in the propylene low-pressure recovery system 1 enters the crude propylene storage tank 2 for storage after passing through the compression pump and the heat exchanger.
The free water separation system 3 comprises a first liquid phase pipeline 301, a second liquid phase pipeline 303, a liquid phase main pipeline 305, a crude propylene filter 309 and a water coalescer 310, wherein the first liquid phase pipeline 301 and the second liquid phase pipeline 303 are respectively connected with a liquid phase outlet of the crude propylene storage tank 2 and are jointly conveyed by adopting a double pump, namely, a first transfer pump 302 is provided on the first liquid phase line 301, a second transfer pump 304 is provided on the second liquid phase line 303, the first liquid phase pipeline 301 and the second liquid phase pipeline 303 are respectively communicated with a liquid phase main pipeline 305, and is connected with a crude propylene filter 309 through a liquid phase main pipeline 305, the crude propylene filter 309 is connected with a water coalescer 310, after impurities of liquid phase substances (including water, propylene, material impurities and the like) in the liquid phase main pipeline 305 are filtered through the crude propylene filter 309, and then the water is removed by the water coalescer 310 and recovered for reuse, and the separated impurities at the bottom of the crude propylene filter 309 and the water coalescer 310 are discharged to a flare for treatment.
In this embodiment, a pressure difference feedback system is disposed on the liquid phase main pipeline 305 at the front end of the crude propylene filter 309 and the rear end of the water coalescer 310, the pressure difference feedback system includes a first pressure gauge 306, a second pressure gauge 308 and a pressure difference interlock alarm 307, and the arrangement of the pressure difference feedback system can monitor the blockage of the crude propylene filter and the water coalescer, so as to facilitate timely cleaning and maintenance.
The membrane separation system 4 comprises a gas phase main pipeline 401, a first filter 402, a second filter 403, a heating heat exchanger 404 and a membrane separation assembly 406, wherein the gas phase main pipeline 401 is connected with the first filter 402, the first filter 402 is connected with the second filter 403, the second filter 403 is connected with the heating heat exchanger 404, the top of the heating heat exchanger 404 is provided with a steam pipeline 406, the bottom of the heating heat exchanger 404 is provided with a condensate water pipeline 405, the heating heat exchanger 404 is connected with the membrane separation assembly 406, the gas phase substances (including gas phase propylene, nitrogen, water vapor and the like) in the gas phase main pipeline 401 pass through the first filter 402 and the second filter 403 to filter physical impurities, enter the heating heat exchanger 404 to evaporate moisture in the gas phase substances (no liquid can enter the membrane separation assembly), then enter the membrane separation assembly 406 to realize separation of the gas phase propylene, and finally are introduced into the propylene low-pressure recovery system 1, and the separated impurities of the membrane separation assembly 406 are discharged to a torch for treatment.
The membrane separation module 406 in this embodiment includes a first membrane separation device 407, a second membrane separation device 408, a third membrane separation device 409, a fourth membrane separation device 410, a fifth membrane separation device 411, and a sixth membrane separation device 412, and the first membrane separation device 407, the second membrane separation device 408, the third membrane separation device 409, the fourth membrane separation device 410, the fifth membrane separation device 411, and the sixth membrane separation device 412 are disposed in parallel on the gas phase main pipe 401.
After the system is implemented, the purity of the recovered propylene is improved to more than 99.5 percent from 80 percent, and the water content is reduced to not more than 20PPm from 500 PPm; after the implementation, the novel free water olefin separator can process and recover propylene at a rate of not less than 4t per hour; 8000 hours per year, 32000 tons of propylene can be recovered per year, and 25600 tons of polymerization grade propylene can be produced.
Claims (5)
1. A free water olefin separation system is characterized by comprising a propylene low-pressure recovery system (1), a crude propylene storage tank (2), a free water separation system (3) and a membrane separation system (4), wherein a liquid phase outlet of the crude propylene storage tank (2) is connected with the free water separation system (3), and impurities are filtered and water is separated through the free water separation system (3); and a gas phase outlet of the crude propylene storage tank (2) is connected with a membrane separation system (4), the membrane separation system (4) is connected with a propylene low-pressure recovery system (1) after separation treatment, and is connected with the crude propylene storage tank (2) through the propylene low-pressure recovery system (1) to realize circulation.
2. The free water olefin separation system according to claim 1, wherein the free water separation system (3) comprises a first liquid phase pipeline (301), a second liquid phase pipeline (303), a liquid phase main pipeline (305), a crude propylene filter (309) and a water coalescer (310), a first transfer pump (302) is arranged on the first liquid phase pipeline (301), a second transfer pump (304) is arranged on the second liquid phase pipeline (303), the first liquid phase pipeline (301) and the second liquid phase pipeline (303) are respectively communicated with the liquid phase main pipeline (305) and are connected with the crude propylene filter (309) through the liquid phase main pipeline (305), the crude propylene filter (309) is connected with the water coalescer (310), and the separated impurities at the bottoms of the crude propylene filter (309) and the water coalescer (310) are discharged to a flare.
3. A free water olefin separation system as claimed in claim 1, wherein the membrane separation system (4) comprises a gas phase main line (401), a first filter (402), a second filter (403), a heating heat exchanger (404) and a membrane separation module (406), the gas phase main line (401) is connected with the first filter (402), the first filter (402) is connected with the second filter (403), the second filter (403) is connected with the heating heat exchanger (404), the heating heat exchanger (404) is connected with the membrane separation module (406), and the separated impurities of the membrane separation module (406) are discharged to a flare.
4. A free water olefin separation system according to claim 2, wherein a pressure difference feedback system is provided on the liquid phase main line (305) at the front end of the crude propylene filter (309) and the rear end of the water coalescer (310), and the pressure difference feedback system comprises a first pressure gauge (306), a second pressure gauge (308) and a pressure difference interlock alarm (307).
5. A free water olefin separation system as claimed in claim 3, wherein the membrane separation assembly (406) comprises a first membrane separation device (407), a second membrane separation device (408), a third membrane separation device (409), a fourth membrane separation device (410), a fifth membrane separation device (411) and a sixth membrane separation device (412), and the first membrane separation device (407), the second membrane separation device (408), the third membrane separation device (409), the fourth membrane separation device (410), the fifth membrane separation device (411) and the sixth membrane separation device (412) are arranged in parallel on the gas phase main pipeline (401).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020692587.8U CN212757588U (en) | 2020-04-29 | 2020-04-29 | Free water olefin separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020692587.8U CN212757588U (en) | 2020-04-29 | 2020-04-29 | Free water olefin separation system |
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| Publication Number | Publication Date |
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| CN212757588U true CN212757588U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020692587.8U Active CN212757588U (en) | 2020-04-29 | 2020-04-29 | Free water olefin separation system |
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| CN (1) | CN212757588U (en) |
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- 2020-04-29 CN CN202020692587.8U patent/CN212757588U/en active Active
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