CN114904461A - Device for reducing polypropylene dust - Google Patents
Device for reducing polypropylene dust Download PDFInfo
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- CN114904461A CN114904461A CN202210363174.9A CN202210363174A CN114904461A CN 114904461 A CN114904461 A CN 114904461A CN 202210363174 A CN202210363174 A CN 202210363174A CN 114904461 A CN114904461 A CN 114904461A
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- gas
- cooler
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- ejector
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 47
- -1 polypropylene Polymers 0.000 title claims abstract description 47
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 47
- 239000000428 dust Substances 0.000 title claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012856 packing Methods 0.000 abstract 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 26
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 26
- 239000002245 particle Substances 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012685 gas phase polymerization Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
- B01J8/0285—Heating or cooling the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/005—Separating solid material from the gas/liquid stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/04—Monomers containing three or four carbon atoms
- C08F10/06—Propene
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B7/00—Combinations of two or more condensers, e.g. provision of reserve condenser
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to a device for reducing polypropylene dust, and belongs to the technical field of polypropylene production. The reactor comprises a third reactor, a gas-solid separator, a cooler, a heater and an ejector, wherein a gas outlet of the third reactor is connected with an inlet of the gas-solid separator, a gas outlet of the gas-solid separator is connected with the cooler, a liquid outlet of the cooler is connected with an inlet of the heater, a gas outlet of the heater is connected with a gas inlet of the ejector, a solid outlet of the gas-solid separator is connected with a solid inlet of the ejector, and an outlet of the ejector is connected with the third reactor. The content of small molecular polymers in the product can be reduced, and the isotacticity of the product is improved. The problem of the scene dust is many is solved in the packing.
Description
Technical Field
The invention belongs to the technical field of polypropylene production, and particularly relates to a device for reducing polypropylene dust.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The process for producing polypropylene by SPG comprises the steps of refining propylene, then carrying out slurry polymerization with a first reactor and a second reactor with a catalyst, then entering a third reaction kettle to complete gas phase polymerization, and enabling a product of the third reaction kettle to enter a cyclone separator to carry out gas-solid separation.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide an apparatus for reducing polypropylene dust.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a reduce device of polypropylene dust, includes third reactor, gas-solid separator, cooler, heater, ejector, and the gas outlet of third reactor and the entry linkage of gas-solid separator, the gas outlet and the cooler of gas-solid separator are connected, and the liquid outlet and the heater entry linkage of cooler, the gas outlet and the gas inlet linkage of ejector of heater, the solid export and the solid entry linkage of ejector of gas-solid separator, the export and the third reactor of ejector are connected.
The invention provides a device for reducing polypropylene dust, wherein after gas-solid separation is carried out on a product obtained in a third reactor for producing polypropylene by an SPG process, gas is condensed and heated and then is used as injection gas to be injected with polypropylene small particles obtained by a gas-solid separator, airflow forming the polypropylene small particles and propylene enters the third reactor and returns to a reaction kettle to continue polymerization reaction, and finally the small-particle polypropylene completely reacts to form a large-particle polypropylene product. The isotacticity of the product is improved, the small molecular polymer is reduced, and the dust amount of a packaging site is reduced.
One or more technical schemes of the invention have the following beneficial effects:
the invention provides a device for reducing polypropylene dust, which is beneficial to reducing the dust content of less than 0.7mm in a product and solving the problem of much dust on a packaging site. The product quality is improved, and particularly, the content of the small molecular polymer in the product can be reduced, and the isotacticity of the product is improved. The load of a propylene recovery compressor is reduced, and the production load of the device is increased.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a block diagram of an apparatus for reducing polypropylene dust;
the system comprises a reactor 1, a reactor 2, a gas-solid separator 3, an ejector 4, a first cooler 5, a second cooler 6, a steam sleeve 7, a condensate pump 8, a rotor flow meter 9 and a material receiving tank, wherein the reactor is provided with valves V1, V2, V3, V4 and V5.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The utility model provides a reduce device of polypropylene dust, includes third reactor, gas-solid separator, cooler, heater, ejector, and the gas outlet of third reactor and the entry linkage of gas-solid separator, the gas outlet and the cooler of gas-solid separator are connected, and the liquid outlet and the heater entry linkage of cooler, the gas outlet and the gas inlet of ejector of heater are connected, and the solid outlet and the solid entry linkage of ejector of gas-solid separator, the export and the third reactor of ejector are connected.
The third reaction kettle in the process of producing polypropylene by SPG completes the gas-phase polymerization process, and the third reaction kettle corresponds to the third reaction kettle in the process of producing polypropylene by SPG. After gas discharged by the existing third reactor passes through a gas-solid separator, collected dust with activity is directly discharged to a material receiving tank and then deactivated, replaced and packaged, so that excessive dust in a polypropylene product influences the product quality, and specifically, the isotacticity is reduced, a large amount of small-molecule polymers are generated, and the environment of a packaging site is severe.
In the invention, the gas discharged from the third reactor is separated by a gas-solid separator to obtain propylene gas and small polypropylene particles, the propylene gas is cooled by a cooler to form propylene condensate, the propylene condensate is heated and then enters an ejector, the small polypropylene particles form mixed gas flow under the action of the propylene gas and enter the third reactor to participate in reaction, the small polypropylene particles form large-particle polypropylene products, and the content of the small polypropylene particles in the finally obtained polypropylene products is reduced, thereby improving the isotacticity of the products.
In some embodiments of the invention, the liquid outlet of the cooler is connected to the third reactor. Because the third reactor is in propylene polymerization exothermic reaction, in the normal reaction process of the third reactor, after the temperature in the reactor rises, the temperature of the reactor needs to be reduced by cold materials, so that the temperature in the reactor is ensured to be constant; the cold material used by the reactor cooling system is condensed by gas-phase propylene in the reactor and then pumped into the reaction kettle by the condensate pump, and the liquid-phase propylene in the reaction kettle is gasified to take away heat to achieve the purpose of cooling the reaction kettle.
In some embodiments of the invention, the diameter of the inlet line of the eductor is 1/2 the diameter of the outlet line. After propylene enters the ejector, the diameter of the pipeline at the outlet is large, the pressure of the gas obtained after the propylene gas and the small polypropylene particles are mixed is reduced, and then the large pipeline is favorable for containing more small polypropylene particles to return to the third reactor for continuous reaction.
In some embodiments of the invention, the liquid outlet of the cooler is connected to a liquid conduit on which a condensate pump is disposed. The condensate pump pumps the condensed liquid to the heater.
In some embodiments of the invention, a flow meter is provided between the condensate pump and the heater. Further, the flowmeter is a rotor flowmeter.
In some embodiments of the invention, the cooler is provided with a first cooler and a second cooler. Set up first cooler and second cooler, can carry out the cooling of more degree of depth to propylene gas, make it become the propylene condensate, then enter into the third reactor in as cold material, play better cooling effect, maintain the invariant of temperature.
In some embodiments of the invention, the liquid outlet of the first cooler or the liquid outlet of the second cooler is connected to the inlet of the heater. The propylene condensate at the liquid outlet of the first cooler or the second cooler can enter the heater to be heated and then enter the ejector to be used as the ejection gas, so that the polypropylene particles return to the third reactor to continue to react.
In some embodiments of the invention, the liquid outlet of the second cooler is connected to the first cooler by a return line. The condensate obtained from the second cooler is partially refluxed to the first cooler. When the horizontal kettle does not need to cool the condensate, the reflux line is added to prevent the outlet of the condensate pump from being suppressed.
In some embodiments of the invention, the heater is a steam jacket disposed on a conduit connecting the cooler and the eductor. The steam jacket heats the propylene in the pipeline to directly become propylene gas.
In some embodiments of the invention, the gas-solid separator further comprises a material receiving tank, and the solid outlet of the gas-solid separator is connected with the material receiving tank. The dust obtained in the gas-solid separator is polypropylene small particles generated by incomplete reaction of propylene in a reactor, the polypropylene small particles enter the separator along with gas-phase propylene and are deposited in the separator, then the gas-phase propylene is discharged into a material receiving tank (with the pressure of 0.1MPa and 55 ℃) under the self pressure (2.4MPa and 75 ℃) of the separator for deactivation and replacement, the small particles of the polypropylene do not continue to react after being subjected to flash evaporation and temperature reduction, and the small particles of the polypropylene are mixed into polypropylene large particles which are completely reacted, so that the small particle dust in a polypropylene product is increased, the product quality is reduced, and the packaging environment is influenced.
In some embodiments of the invention, the gas-solid separator is a cyclone.
The use flow of the device for reducing the polypropylene dust comprises the following steps:
firstly, a first path of DN25 propylene pipeline passes through an outlet of a condensate pump 7, the pipeline is a throwing port DN25 pipeline of the outlet of the condensate pump 7 in sequence, the gas propylene is heated at a steam sleeve 6 after passing through a rotor flow meter 8 (the steam sleeve 6 is sleeved outside a DN25 propylene pipeline by a DN50 pipe), then the heated and gasified propylene passes through an ejector 3, and the propylene pipeline after the ejector 3 is changed in diameter into a DN50 pipeline and enters a third reactor 1. The gas outlet of the third reactor 1 is connected with the gas-solid separator 2 through a pipeline, a V5 valve is arranged on the pipeline, a V1 valve at the bottom of the gas-solid separator 2 is connected to the ejector 3 (the valve is normally open), so that dust at the bottom of the gas-solid separator 2 can enter the third reactor 1 under the suction force of the ejector 3, and the flow of the V2 valve and the material receiving tank 9 is stopped or standby. Gas discharged from the top of the gas-solid separator 2 sequentially enters a first cooler 4 and a second cooler 5 for condensation, and is then pumped by a condensate pump 7, an outlet of the condensate pump 7 is directly conveyed to the third reactor 1 through a second pipeline, a V4 valve is arranged on the second pipeline, an outlet of the condensate pump 7 is conveyed to the first cooler 4 through a third pipeline, and a V3 valve is arranged on the third pipeline.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device for reducing polypropylene dust is characterized in that: the reactor comprises a third reactor, a gas-solid separator, a cooler, a heater and an ejector, wherein a gas outlet of the third reactor is connected with an inlet of the gas-solid separator, a gas outlet of the gas-solid separator is connected with the cooler, a liquid outlet of the cooler is connected with an inlet of the heater, a gas outlet of the heater is connected with a gas inlet of the ejector, a solid outlet of the gas-solid separator is connected with a solid inlet of the ejector, and an outlet of the ejector is connected with the third reactor.
2. The apparatus for reducing polypropylene dust of claim 1, wherein: the liquid outlet of the cooler is connected with the third reactor.
3. The apparatus for reducing polypropylene dust of claim 1, wherein: the diameter of the air inlet pipeline of the ejector is 1/2 of the diameter of the air outlet pipeline.
4. The apparatus for reducing polypropylene dust of claim 1, wherein: and a liquid outlet of the cooler is connected with a liquid pipeline, and a condensate pump is arranged on the liquid pipeline.
5. The apparatus for reducing polypropylene dust according to claim 4, wherein: a flowmeter is arranged between the condensate pump and the heater.
6. The apparatus for reducing polypropylene dust according to claim 1, wherein: the cooler is provided with a first cooler and a second cooler.
7. The apparatus for reducing polypropylene dust of claim 6, wherein: the liquid outlet of the first cooler or the liquid outlet of the second cooler is connected with the inlet of the heater.
8. The apparatus for reducing polypropylene dust of claim 6, wherein: the liquid outlet of the second cooler is connected with the first cooler through a return line.
9. The apparatus for reducing polypropylene dust of claim 1, wherein: the heater is a steam sleeve, and the steam sleeve is arranged on a pipeline connected with the cooler and the ejector.
10. The apparatus for reducing polypropylene dust according to claim 1, wherein: the gas-solid separator is characterized by also comprising a material receiving tank, wherein a solid outlet of the gas-solid separator is connected with the material receiving tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210363174.9A CN114904461A (en) | 2022-04-07 | 2022-04-07 | Device for reducing polypropylene dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210363174.9A CN114904461A (en) | 2022-04-07 | 2022-04-07 | Device for reducing polypropylene dust |
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| Publication Number | Publication Date |
|---|---|
| CN114904461A true CN114904461A (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210363174.9A Pending CN114904461A (en) | 2022-04-07 | 2022-04-07 | Device for reducing polypropylene dust |
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| Country | Link |
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| CN (1) | CN114904461A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005014659A1 (en) * | 2003-08-07 | 2005-02-17 | Eastman Chemical Company | Polymerization process and associated apparatus |
| CN201493087U (en) * | 2009-08-05 | 2010-06-02 | 成都金石达高新技术有限公司 | Propylene feeding automatic control device |
| CN211487608U (en) * | 2019-09-23 | 2020-09-15 | 国家能源集团宁夏煤业有限责任公司 | Polypropylene production system |
| CN111875726A (en) * | 2020-08-12 | 2020-11-03 | 上海赛科石油化工有限责任公司 | Polypropylene production operation control method |
-
2022
- 2022-04-07 CN CN202210363174.9A patent/CN114904461A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005014659A1 (en) * | 2003-08-07 | 2005-02-17 | Eastman Chemical Company | Polymerization process and associated apparatus |
| CN201493087U (en) * | 2009-08-05 | 2010-06-02 | 成都金石达高新技术有限公司 | Propylene feeding automatic control device |
| CN211487608U (en) * | 2019-09-23 | 2020-09-15 | 国家能源集团宁夏煤业有限责任公司 | Polypropylene production system |
| CN111875726A (en) * | 2020-08-12 | 2020-11-03 | 上海赛科石油化工有限责任公司 | Polypropylene production operation control method |
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Application publication date: 20220816 |