CN111908997A - Tetrafluoroethylene production system and energy-saving production process - Google Patents
Tetrafluoroethylene production system and energy-saving production process Download PDFInfo
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- CN111908997A CN111908997A CN202010626937.5A CN202010626937A CN111908997A CN 111908997 A CN111908997 A CN 111908997A CN 202010626937 A CN202010626937 A CN 202010626937A CN 111908997 A CN111908997 A CN 111908997A
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- tetrafluoroethylene
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000003860 storage Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005336 cracking Methods 0.000 claims description 15
- 238000009835 boiling Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 239000006200 vaporizer Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 35
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 6
- 239000012043 crude product Substances 0.000 description 6
- 229910052731 fluorine Inorganic materials 0.000 description 6
- 239000011737 fluorine Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000002309 gasification Methods 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 239000011874 heated mixture Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000004230 steam cracking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/26—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton
- C07C17/263—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions
- C07C17/269—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions of only halogenated hydrocarbons
-
- 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)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention particularly relates to a tetrafluoroethylene production system and an energy-saving production process. The yield of the tetrafluoroethylene is larger, and more energy is consumed in the production process. The invention aims to optimize the tetrafluoroethylene production process and reduce the production energy consumption. Aiming at the technical purpose, the invention provides a tetrafluoroethylene production system which comprises a storage tank, a pressure pump, a superheater, a buffer tank and a tower top condenser which are connected in sequence through a pipeline. In the traditional process for producing tetrafluoroethylene by adopting R22, a refrigerator is required to liquefy gaseous R22 into liquid and then send the liquid into a vaporizer to be vaporized, the liquid R22 is introduced into an overhead condenser of a rectifying tower, and the liquid R22 is vaporized by absorbing the heat of components in an overhead condenser pipeline and then enters a superheater, so that the refrigerator and the vaporizer are not required, the production system is simplified, and the energy exchange in the production process is reduced.
Description
Technical Field
The invention belongs to the technical field of energy-saving production, and particularly relates to a tetrafluoroethylene production system and an energy-saving production process.
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.
Tetrafluoroethylene, abbreviated as TFE, a monomer of a fluorine-containing polymer and an intermediate of a fluorine-containing compound is a fluorine-containing monomer which is most important for the maximum production amount at present. At present, the industrial production route of tetrafluoroethylene mainly takes chlorodifluoromethane (R22) as a production raw material, and the method for producing tetrafluoroethylene through dilution and cracking of the chlorodifluoromethane by water vapor comprises the steps of heating R22, heating the heated mixture, and then heating the heated mixture in a high-nickel alloy reactor to carry out cracking reaction; and (3) rapidly cooling and absorbing the pyrolysis gas from the pyrolysis reactor to obtain a crude product, removing light components and part of high-boiling residues through a rectifying tower, and separating to obtain a tetrafluoroethylene product.
The polytetrafluoroethylene is the most important product in the organic fluorine industry, the development of the polytetrafluoroethylene affects the production development of other organic fluorine products, and the polytetrafluoroethylene is a mark of the development level of the organic fluorine industry in China. Therefore, the efficient and energy-saving production of tetrafluoroethylene is also of great significance. The production route for preparing tetrafluoroethylene by the R22 pyrolysis technology has the advantages of simple and convenient method, simple equipment and easy industrialization. Meanwhile, the production process is accompanied by more energy consumption in the production process, and especially the consumption of heating steam and electric energy is more when cracking and heating fuel such as coal gas. Therefore, how to design a new energy-saving process for producing tetrafluoroethylene to reduce energy consumption is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the problems described in the background art, the present invention aims to provide an energy-saving process for producing tetrafluoroethylene. In the traditional tetrafluoroethylene production process, R22 is pressurized into liquid through a refrigerating machine, and then enters a vaporizer for gasification, is mixed with water vapor and enters a buffer tank to prepare for entering a cracking furnace for high-temperature cracking. The invention is improved aiming at the process, the liquid R22 is introduced into the overhead condenser, and the energy consumption in the production process of tetrafluoroethylene is effectively reduced through the gasification of the heat provided by the overhead condenser.
Aiming at the technical purpose, the invention provides the following technical scheme:
in a first aspect of the present invention, a tetrafluoroethylene production system is provided, which comprises a storage tank, a pressure pump, a superheater, a buffer tank, and a tower top condenser, which are sequentially connected through a pipeline.
In the existing tetrafluoroethylene production process, R22 and pyrolysis gas generated after steam cracking are cooled and adsorbed to obtain a crude product of tetrafluoroethylene, and in order to remove the low-boiling-point impurities in the crude product, the crude product needs to be placed in a rectifying tower and heated at a temperature lower than the boiling point of tetrafluoroethylene, so that the low-boiling-point impurities in the crude product are separated from the crude product, such as R22, HFP and the like. In the existing production process, low-boiling components such as R22 and HFP are cooled into liquid in a condenser at the top of a tower through condensed water, and the liquid is purified in other rectifying towers to obtain corresponding byproducts.
The invention improves the existing tetrafluoroethylene production system, and the liquid R22 is conveyed to the overhead condenser for gasification by the pressure pump without adopting a refrigerator and a vaporizer. In the overhead condenser, R22, a booster pump and a superheater form a passage; the low boiling point component and the rectifying tower form a loop; r22 and low boiling point components are respectively arranged inside and outside the pipeline, and contact heat exchange is carried out. The heat exchange mode provided by the invention can not only remove the refrigerant and the vaporizer in the original system and reduce the workload of the refrigerator, but also reduce the consumption of condensed water, and simultaneously save the electric energy and the water consumption, thereby having important significance for energy-saving production.
In a second aspect of the present invention, an energy-saving tetrafluoroethylene production process is further provided, wherein the energy-saving production process comprises the following steps:
the liquid R22 is gasified by a tower top condenser of the rectifying tower, the gasified R22 is mixed with water vapor and then enters a cracking device, and low-boiling-point impurities in the rectifying tower enter the tower top condenser in a gaseous form to exchange heat to form a liquid state, so that the liquid state is separated.
The beneficial effects of one or more technical schemes are as follows:
1. compared with the existing tetrafluoroethylene production system, the production system provided by the invention has small improvement range and is easy to realize when applied to enterprise production.
2. The R22 is introduced into the overhead condenser for gasification, so that the workload of an ice maker in the production process is effectively reduced, the electric energy consumption and the water consumption in the tetrafluoroethylene production process are reduced, and the method has important economic significance.
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 exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an apparatus for producing tetrafluoroethylene in example 1;
wherein, 1 is a storage tank, 2 is a booster pump, 3 is a regulating valve, 4 is a reboiler, 5 is a rectifying tower, 6 is a tower top condenser, and 7 is a superheater; 61 is a pipeline between the top of the rectifying tower and the top of the tower top condenser, 62 is a pipeline between the bottom of the tower top condenser and the side wall of the rectifying tower, 63 is a pipeline between the pressure pump and the tower top condenser, and 64 is a pipeline between the tower top condenser and the superheater.
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 exemplary embodiments according to the invention. 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.
As introduced in the background art, the yield of tetrafluoroethylene is high, and energy consumption in the production process is high, so that the technical problem is solved.
In a first aspect of the present invention, a tetrafluoroethylene production system is provided, which comprises a storage tank, a pressure pump, a superheater, a buffer tank, and a tower top condenser, which are sequentially connected through a pipeline.
Preferably, the bottom of the storage tank is provided with a pipeline connected with a booster pump, the booster pump is used for conveying the R22 in the storage tank to the overhead condenser, and the booster pump and the pipeline of the overhead condenser are also provided with a regulating valve.
Further preferably, the side wall of the storage tank is also provided with a return line connected with the regulating valve.
Preferably, the overhead condenser includes an outer wall and an inner pipe with a gap therebetween.
Preferably, the production system further comprises a rectifying tower and a reboiler, the lower part of the rectifying tower is provided with a pipeline which is communicated with the reboiler to form a loop, and the top of the rectifying tower is provided with a pipeline which is communicated with a condenser at the top of the rectifying tower to form a loop.
Further preferably, the rectifying tower is communicated with an internal pipeline of the tower top condenser.
Further preferably, the R22 flows through the gap between the outer wall of the overhead condenser and the inner pipeline and enters the superheater.
Further preferably, a pipeline flowing to the rectifying tower from the bottom of the tower top condenser is provided with a valve for controlling the opening and closing of the pipeline.
Preferably, the inner pipeline of the tower top condenser is made of a material with good heat conductivity.
Preferably, the superheater further has a steam introduction line for mixing R22 with steam.
More preferably, the pressure of the steam is 0.2 to 0.5 MPa.
Preferably, the production system further comprises a buffer tank and a cracking furnace, wherein the buffer tank is used for containing the R22 mixed by the superheater and the water vapor and preparing to enter the cracking furnace.
In a second aspect of the present invention, an energy-saving tetrafluoroethylene production process is provided, which comprises the following steps:
the liquid R22 is gasified by a tower top condenser of the rectifying tower, the gasified R22 is mixed with water vapor and then enters a cracking device, and low-boiling-point impurities in the rectifying tower enter the tower top condenser in a gaseous form to exchange heat to form a liquid state, so that the liquid state is separated.
Preferably, the pressure of the water vapor is 0.2-0.5 MPa.
Preferably, the R22 and the low-boiling-point component in the rectifying tower are respectively positioned inside and outside the pipeline, and contact heat exchange is carried out.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
In the present embodiment, as shown in fig. 1, a tetrafluoroethylene production system is provided, which includes a storage tank 1, a pressure pump 2, a regulating valve 3, a reboiler 4, a rectifying column 5, an overhead condenser 6, and a superheater 7.
Wherein, the bottom of the storage tank 1 is provided with a pipeline communicated with a booster pump, R22 in the storage tank 1 is conveyed to the overhead condenser 6 through the booster pump 2, and the pipeline 63 of the booster pump 2 and the overhead condenser 6 is also provided with a regulating valve 3 for controlling the content of R22 entering the overhead condenser 6. A return line is also provided in the side wall of the tank 1 and communicates with the line 63, through which return line R22 can flow back to the tank 1 when there is an excess of liquid in the line.
Top of the tower condenser 6 has outer wall and internal piping structure, has certain space between outer wall and the pipeline, internal piping passes through top of the tower condenser top pipeline 61 and bottom pipeline 62 and rectifying column intercommunication, top of the tower condenser 6 outer wall has pipeline 63 to be connected with the force pump, still has pipeline 64 to be connected with over heater 7, the space intercommunication in pipeline 63, pipeline 64 and top of the tower condenser 6, after R22 got into top of the tower condenser 6, do not contact with the material in the internal piping.
The rectifying tower 5 and the reboiler 4 form a loop through a pipeline, the rectifying tower 5 is used for treating a cracked crude tetrafluoroethylene product, and the cracked crude tetrafluoroethylene product is heated by the reboiler 4, so that low-boiling-point components in the rectifying tower 5 are evaporated and enter the overhead condenser 6, and impurities in the tetrafluoroethylene are removed. The substances in the pipeline in the overhead condenser 6 are cooled and heat exchanged through the overhead condenser to generate materials such as R22 and HFP with recycling value, and the materials flow into other rectifying towers through pipelines to obtain corresponding byproducts.
And the gasified R22 in the overhead condenser 6 enters the superheater 7, is mixed with water vapor and then enters a buffer tank in front of the cracking furnace for storage, and is ready to enter the cracking furnace for cracking.
In this embodiment, a production process of the above tetrafluoroethylene production system is further provided, the liquid R22 is stored in the storage tank 1 for standby, the liquid level is kept at 50-80% of the height of the inner wall of the storage tank, the pressure pump is started to convey the R22 to the overhead condenser through the pipeline 63, and the regulating valve 3 is used for controlling the R22 dosage entering the overhead condenser 2. The reboiler 4 provides heat for the rectifying tower 5, so that the low boiling point components in the rectifying tower 5 enter the internal pipeline of the tower top condenser 6 through the pipeline 61, at the moment, the low boiling point components with higher temperature exchange heat with R22 through the internal pipeline of the tower top condenser 6, R22 absorbs heat to become gaseous R22 and enter the superheater from the pipeline 64, the low boiling point components become liquid due to heat release temperature reduction and gather at the bottom of the tower top condenser, when the heat is accumulated to a certain degree, the pipeline 62 is provided with a valve, and the valve is opened to throw the materials with recycling values, such as R22 and HFP, produced by condensation into other rectifying towers again for subsequent treatment, such as purification and the like.
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 tetrafluoroethylene production system is characterized by comprising a storage tank, a pressure pump, a superheater, a buffer tank and a tower top condenser which are sequentially communicated through a pipeline.
2. The tetrafluoroethylene production system according to claim 1, wherein the bottom of the storage tank is provided with a pipeline connected with a pressure pump, the pressure pump is used for transporting the R22 in the storage tank to the overhead condenser, and the pipeline of the pressure pump and the overhead condenser is also provided with a regulating valve; preferably, the side wall of the storage tank is also provided with a return line connected with the regulating valve.
3. The tetrafluoroethylene production system according to claim 1, wherein the overhead condenser comprises an outer wall and an inner pipe, and a space is provided between the outer wall and the inner pipe.
4. The tetrafluoroethylene production system of claim 1, further comprising a rectifying column and a reboiler, wherein the rectifying column has a pipeline at its lower part and is connected to the reboiler to form a loop, and the rectifying column has a pipeline at its top part and is connected to the overhead condenser to form a loop.
5. The tetrafluoroethylene production system according to claim 4, wherein the rectifying column is in communication with an overhead condenser internal line;
or the R22 flows through the gap between the outer wall of the overhead condenser and the inner pipeline and enters the superheater;
or a pipeline flowing to the rectifying tower from the bottom of the tower top condenser is provided with a valve for controlling the opening and closing of the pipeline;
or the inner pipeline of the tower top condenser is made of a material with good heat conducting property.
6. The tetrafluoroethylene production system according to claim 1, wherein the superheater further has a steam introduction line for mixing R22 with steam; preferably, the pressure of the water vapor is 0.2-0.5 MPa.
7. The tetrafluoroethylene production system of claim 1, further comprising a buffer tank and a cracking furnace, wherein the buffer tank is used for containing the R22 mixed by the superheater and the water vapor to prepare for entering the cracking furnace.
8. The energy-saving production process of tetrafluoroethylene is characterized by comprising the following steps:
the liquid R22 is gasified by a tower top condenser of the rectifying tower, the gasified R22 is mixed with water vapor and then enters a cracking device, and low-boiling-point impurities in the rectifying tower enter the tower top condenser in a gaseous form to exchange heat to form a liquid state, so that the liquid state is separated.
9. The energy-saving tetrafluoroethylene production process according to claim 8, wherein the pressure of the water vapor is 0.2-0.5 MPa.
10. The energy-saving tetrafluoroethylene production process as claimed in claim 8, wherein the R22 and the low boiling point component in the rectifying tower are respectively positioned inside and outside the pipeline and exchange heat through contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010626937.5A CN111908997A (en) | 2020-07-02 | 2020-07-02 | Tetrafluoroethylene production system and energy-saving production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010626937.5A CN111908997A (en) | 2020-07-02 | 2020-07-02 | Tetrafluoroethylene production system and energy-saving production process |
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| CN111908997A true CN111908997A (en) | 2020-11-10 |
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| CN202010626937.5A Pending CN111908997A (en) | 2020-07-02 | 2020-07-02 | Tetrafluoroethylene production system and energy-saving production process |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973843A (en) * | 2010-10-18 | 2011-02-16 | 天津市泰旭物流有限公司 | Technology for preparing tetrafluoroethylene through dilution and pyrolysis of difluorochloromethane and water vapor |
| CN110755869A (en) * | 2019-09-27 | 2020-02-07 | 浙江省天正设计工程有限公司 | Low-grade waste heat recovery device and process for rectification system |
-
2020
- 2020-07-02 CN CN202010626937.5A patent/CN111908997A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973843A (en) * | 2010-10-18 | 2011-02-16 | 天津市泰旭物流有限公司 | Technology for preparing tetrafluoroethylene through dilution and pyrolysis of difluorochloromethane and water vapor |
| CN110755869A (en) * | 2019-09-27 | 2020-02-07 | 浙江省天正设计工程有限公司 | Low-grade waste heat recovery device and process for rectification system |
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