CN111924349A - Device for preventing acrylonitrile liquid from self-polymerization and control method - Google Patents
Device for preventing acrylonitrile liquid from self-polymerization and control method Download PDFInfo
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- CN111924349A CN111924349A CN202010646823.7A CN202010646823A CN111924349A CN 111924349 A CN111924349 A CN 111924349A CN 202010646823 A CN202010646823 A CN 202010646823A CN 111924349 A CN111924349 A CN 111924349A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/70—Cooling of pipes or pipe systems
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Abstract
The invention provides a device for preventing acrylonitrile liquid from self-polymerization and a control method, wherein the device for preventing the acrylonitrile liquid from self-polymerization comprises: an acrylonitrile storage tank (1) for storing acrylonitrile; the device also comprises a first pipeline (101), wherein one end of the first pipeline (101) is communicated with the acrylonitrile storage tank (1) so as to introduce polymerization-resistant gas into the acrylonitrile storage tank (1). According to the invention, the generation of polyacrylonitrile due to self-polymerization of acrylonitrile liquid in the storage and conveying processes can be effectively prevented, the use of a polymerization inhibitor is effectively avoided, the polymerization reaction of acrylonitrile is not influenced, the quality of a final product polymer is not influenced, the removal of the polymerization inhibitor is not required before and during the use of acrylonitrile, additional equipment and operation are not required, and the process control is simple and convenient.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to a device for preventing acrylonitrile liquid from self-polymerization and a control method.
Background
Acrylonitrile is a common chemical raw material, is commonly used for preparing polyacrylonitrile polymer materials, and is widely applied to the field of synthesizing polyacrylonitrile fibers (acrylon and polyacrylonitrile-based carbon fibers). The molecular structure of acrylonitrile contains active double bonds, and the acrylonitrile easily undergoes self-polymerization under the action of high temperature, illumination, radiation, oxygen, microwave and the like to form a high molecular polymer. The acrylonitrile can release a large amount of heat due to self-polymerization, so that the pressure in a pipeline and equipment is increased, meanwhile, the formed polyacrylonitrile with high molecular weight is separated out in acrylonitrile liquid to block a filter, the pipeline is blocked and the equipment is damaged in serious conditions, and the quality of a final product is influenced if the self-polymerization polymer is not removed. Polymerization inhibitors (phenols, quinones, aromatic hydrocarbons, inorganic salts, etc.) are generally added to acrylonitrile liquids to prevent the self-polymerization of acrylonitrile during storage and transportation. The presence of the polymerization inhibitor affects the polymerization of acrylonitrile and the quality of the final polymer product, and therefore the polymerization inhibitor needs to be removed before or during the use of acrylonitrile, which requires additional equipment and operation and also causes difficulties in process control.
In the prior art, the pressure in a pipeline and equipment is increased due to the self-polymerization of acrylonitrile, and meanwhile, high molecular weight polyacrylonitrile can be formed and block a filter, so that the pipeline is seriously blocked, the equipment is damaged, and the quality of a final product is influenced; if the polymerization inhibitor is adopted, the polymerization reaction of acrylonitrile is influenced, the quality of a final product polymer is influenced, the polymerization inhibitor needs to be removed before or in the using process of the acrylonitrile, equipment and operation need to be added, and the technical problems of difficult process control and the like are caused.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the self-polymerization reaction is easy to occur in the storage or transportation equipment of the acrylonitrile in the prior art, and the polymerization reaction of the acrylonitrile is influenced by adopting the polymerization inhibitor, so that the quality of the final product polymer is influenced, thereby providing the device and the control method for preventing the self-polymerization of the acrylonitrile liquid.
In order to solve the above problems, the present invention provides an apparatus for preventing self-polymerization of acrylonitrile liquid, comprising:
an acrylonitrile storage tank for storing acrylonitrile; the device also comprises a first pipeline, wherein one end of the first pipeline is communicated with the acrylonitrile storage tank so as to introduce polymerization-inhibiting gas into the acrylonitrile storage tank.
Preferably, a first control valve is further arranged on the first pipeline.
Preferably, the device also comprises a second pipeline, and one end of the second pipeline is also communicated with the acrylonitrile storage tank so as to lead out the polymerization-resistant gas in the acrylonitrile storage tank.
Preferably, a second control valve is arranged on the second pipeline or the position where the second pipeline is communicated with the acrylonitrile storage tank.
Preferably, when the first control valve is included, the first control valve is a regulating valve, and the opening pressure is 2-4 Kpa; and/or the second control valve is a one-way valve, and the opening pressure is 3-5 Kpa.
Preferably, the position where the first pipeline is communicated with the acrylonitrile storage tank is positioned at the top of the acrylonitrile storage tank; and/or the position where the second pipeline is communicated with the acrylonitrile storage tank is positioned at the top of the acrylonitrile storage tank.
Preferably, the polymerization inhibiting gas comprises a mixture of nitrogen and oxygen, wherein the concentration of oxygen is 0.0005% to 6.5%.
Preferably, a conveying pipeline is arranged at the bottom of the acrylonitrile storage tank in a communicating manner, and the conveying pipeline can guide and convey acrylonitrile in the acrylonitrile storage tank; and an outer jacket sleeve is sleeved outside the conveying pipeline, and cooling liquid is introduced into the outer jacket sleeve.
The present invention also provides a control method suitable for the apparatus for preventing self-polymerization of acrylonitrile liquid described in any one of the above, which when the apparatus includes a first control valve, comprises: a detection step for detecting the pressure in the acrylonitrile storage tank; a judging step of judging the relation between the pressure in the acrylonitrile storage tank and a first preset pressure value; controlling, if the pressure in the acrylonitrile storage tank is smaller than the first preset pressure value, the first control valve to be opened, and introducing polymerization-inhibiting gas into the acrylonitrile storage tank; and if the pressure in the acrylonitrile storage tank is greater than or equal to the first preset pressure value, controlling the first control valve to be closed.
Preferably, when the apparatus includes a second control valve, the control method includes: a detection step for detecting the pressure in the acrylonitrile storage tank; a judging step of judging the relation between the pressure in the acrylonitrile storage tank and a second preset pressure value; controlling, if the pressure in the acrylonitrile storage tank is greater than or equal to the second preset pressure value, the second control valve to be opened to lead out the polymerization-inhibiting gas in the acrylonitrile storage tank; and if the pressure in the acrylonitrile storage tank is smaller than the second preset pressure value, controlling the second control valve to be closed.
Preferably, the first preset pressure value is 2-4 Kpa; and/or the second preset pressure value is 3-5 Kpa.
The device for preventing acrylonitrile liquid from self-polymerization and the control method have the following beneficial effects:
1. according to the invention, the first pipeline is communicated with the acrylonitrile storage tank, and the polymerization-inhibiting gas is introduced into the first pipeline, so that the generation of polyacrylonitrile due to self-polymerization of acrylonitrile liquid in the storage and conveying processes can be effectively prevented, the use of a polymerization inhibitor is effectively avoided, the polymerization reaction of acrylonitrile is not influenced, the quality of a final product polymer is not influenced, the removal of the polymerization inhibitor is not required before and during the use of acrylonitrile, and no additional equipment or operation is required, so that the process control is simple and convenient;
2. according to the invention, through the use of the first control valve and the second control valve, the gas introduction mode is positive pressure instead of negative pressure, the pressure in the tank is micro-positive pressure, preferably, the pressure regulating valve and the breather valve are combined, the pressure value range is limited by combining economy, and intelligent and automatic control can be formed; the invention also can further prevent the self-polymerization of the liquid in the tank and the liquid in the pipeline by arranging the cooling water jacket outside the conveying pipeline.
Drawings
FIG. 1 is a schematic view showing the structure of the apparatus for preventing the self-polymerization of acrylonitrile liquid according to the present invention.
The reference numerals are represented as:
1. an acrylonitrile storage tank; 2. a first control valve; 3. a second control valve; 4. a delivery conduit; 5. an outer jacket sleeve; 101. a first pipeline; 102. a second pipeline.
Detailed Description
As shown in FIG. 1, the present invention provides an apparatus for preventing the self-polymerization of acrylonitrile liquid, comprising:
an acrylonitrile storage tank 1 for storing acrylonitrile; the device further comprises a first pipeline 101, wherein one end of the first pipeline 101 is communicated with the acrylonitrile storage tank 1 so as to introduce polymerization-inhibiting gas into the acrylonitrile storage tank 1.
According to the invention, through the first pipeline communicated with the acrylonitrile storage tank, and the anti-polymerization gas is introduced into the first pipeline, the generation of polyacrylonitrile due to self-polymerization of acrylonitrile liquid in the storage and conveying processes can be effectively prevented, the use of a polymerization inhibitor is effectively avoided, so that the polymerization reaction of acrylonitrile is not influenced, the quality of a final product polymer is not influenced, the removal of the polymerization inhibitor is not required before and during the use of acrylonitrile, no additional equipment and operation are required, and the process control is simple and convenient. The invention adopts a method of introducing polymerization-inhibiting gas into the equipment to prevent the self-polymerization phenomenon during the storage of acrylonitrile liquid in the equipment, and simultaneously adopts a pipeline cooling measure to prevent the self-polymerization in the acrylonitrile conveying process. The method can effectively prevent the self-polymerization phenomenon of the acrylonitrile liquid in the storage and conveying processes, has simple process, does not need to remove the polymerization inhibitor subsequently, and is convenient to operate.
The device for preventing acrylonitrile liquid from self-polymerization comprises acrylonitrile liquid storage equipment (an acrylonitrile storage tank 1), wherein the top of the equipment is provided with a nitrogen inlet and a gas outlet, the nitrogen inlet is connected with a nitrogen pressure regulating valve (a first control valve 2), the gas outlet is provided with a breather valve (a second control valve 3), the bottom of the equipment is provided with a conveying pipeline 4 for acrylonitrile liquid, an outer jacket pipe 5 for cooling water is arranged outside the conveying pipeline, and cooling water is introduced into the outer jacket pipe 5. The accumulation-resistant gas enters the acrylonitrile liquid storage equipment after passing through the nitrogen pressure regulating valve, when the gas pressure in the equipment is greater than the opening pressure of the breather valve, the breather valve is opened to release the pressure, and when the gas pressure in the equipment is less than the opening pressure of the nitrogen pressure regulating valve, the nitrogen pressure regulating valve is opened to supply the accumulation-resistant gas into the equipment, so that a certain pressure is maintained in the equipment.
The outlet pressure of the nitrogen regulating valve is smaller than the opening pressure of the breather valve 3, and the breather valve is a one-way valve. The polymerization-inhibiting gas is nitrogen containing 0.0005 to 6.5 percent of oxygen. The nitrogen and oxygen mixture having the oxygen concentration ratio set within the above range can exert the optimum effect of inhibiting polymerization. The temperature of the cooling water is 5-12 ℃. The cooling water temperature can play the best cooling effect to acrylonitrile when 5 ~ 12 ℃, further plays the effect of hindering and gathering.
Preferably, a first control valve 2 is further arranged on the first pipeline 101. The on-off of this first pipeline can be controlled effectively through the setting of first control valve to and can control the on-off of this pipeline according to the size that lets in pressure, can effectively avoid because the condition emergence that pressure is low excessively and leads to unable tonifying qi in the air inlet pipe way.
Preferably, a second pipeline 102 is further included, and one end of the second pipeline 102 is also communicated with the acrylonitrile storage tank 1 so as to lead out the polymerization-resistant gas in the acrylonitrile storage tank 1. The invention also can discharge the gas inside the acrylonitrile storage tank when the pressure in the acrylonitrile storage tank is too high through the arrangement of the second pipeline, thereby avoiding safety accidents caused by the too high gas pressure, and can discharge the high-pressure redundant gas under the condition of enough polymerization-resistant gas inside the acrylonitrile, thereby not influencing the prevention of the self-polymerization reaction of the acrylonitrile inside the acrylonitrile storage tank.
Preferably, a second control valve 3 is provided on the second pipe 102 or at a position where the second pipe 102 communicates with the acrylonitrile storage tank 1. The second control valve can be used for effectively controlling the on-off of the second pipeline and controlling the on-off of the pipeline according to the discharge pressure, so that the situation that the pressure in the exhaust pipeline is too low to cause exhaust can be effectively avoided.
Preferably, when the first control valve 2 is included, the first control valve 2 is a regulating valve, and the opening pressure is 2-4 Kpa; and/or the second control valve 3 is a one-way valve, and the opening pressure is 3-5 Kpa. The first control valve is preferably a regulating valve which can be controlled and regulated according to a set opening pressure, and the second control valve is preferably a one-way valve which can automatically open the exhaust according to the set opening pressure.
Preferably, the position where the first pipeline 101 is communicated with the acrylonitrile storage tank 1 is positioned at the top of the acrylonitrile storage tank 1; and/or the position where the second pipe 102 communicates with the acrylonitrile storage tank 1 is located at the top of the acrylonitrile storage tank 1. The optimal connection position of the first pipeline and the second pipeline is provided, and the polymerization-resistant gas flows in the first pipeline and the second pipeline, so that the normal introduction and discharge of the polymerization-resistant gas can be ensured by introducing and discharging the polymerization-resistant gas from the top of the acrylonitrile storage tank, and the acrylonitrile can be prevented from being mistakenly led out of the storage tank.
Preferably, a conveying pipeline 4 is arranged at the bottom of the acrylonitrile storage tank 1 in a communicating manner, and the conveying pipeline 4 can guide and convey the acrylonitrile in the acrylonitrile storage tank 1; an outer jacket sleeve 5 is sleeved outside the conveying pipeline 4, and cooling liquid is introduced into the outer jacket sleeve 5; and/or the polymerization inhibiting gas comprises nitrogen. The polymerization-inhibiting gas is nitrogen containing 0.0005 to 6.5 percent of oxygen. The nitrogen and oxygen mixture having the oxygen concentration ratio set within the above range can exert the optimum effect of inhibiting polymerization. By providing a cooling water jacket outside the transfer pipe, the self-polymerization of the liquid in the tank and the liquid in the pipe can be further prevented, and the temperature of the cooling water can be limited. The cooling water temperature can play the best cooling effect to acrylonitrile when 5 ~ 12 ℃, further plays the effect of hindering and gathering.
The present invention also provides a control method suitable for the apparatus for preventing self-polymerization of acrylonitrile liquid described in any one of the above, which when the apparatus includes the first control valve 2, the control method comprises: a detection step for detecting the pressure in the acrylonitrile storage tank 1; a judging step of judging the relation between the pressure in the acrylonitrile storage tank 1 and a first preset pressure value; controlling, if the pressure in the acrylonitrile storage tank 1 is smaller than the first preset pressure value, the first control valve 2 to be opened, and introducing polymerization-inhibiting gas into the acrylonitrile storage tank 1; and if the pressure in the acrylonitrile storage tank 1 is greater than or equal to the first preset pressure value, controlling the first control valve 2 to close.
The acrylonitrile storage tank 1 and the first control valve are preferably controlled according to different inlet pressure, so that the first control valve can be automatically opened to finish the gas inlet process of the accumulation-resistant gas under the condition that the acrylonitrile storage tank 1 does not reach the first preset pressure value, and the first control valve can be closed to prevent the gas in the storage tank from flowing back under the condition that the acrylonitrile storage tank 1 exceeds the first preset pressure value, and the intelligent automatic control of the gas inlet process can be finished.
Preferably, when the apparatus includes the second control valve 3, the control method includes: a detection step for detecting the pressure of the polymerization inhibiting gas in the acrylonitrile storage tank 1; a judging step of judging the relation between the pressure in the acrylonitrile storage tank 1 and a second preset pressure value; controlling, if the pressure in the acrylonitrile storage tank 1 is greater than or equal to the second preset pressure value, the second control valve 3 to be opened to lead out the polymerization-inhibiting gas in the acrylonitrile storage tank 1; and if the pressure in the acrylonitrile storage tank 1 is smaller than the second preset pressure value, controlling the second control valve 3 to close.
The acrylonitrile storage tank 1 and the second control valve of the invention are the preferable control means under the condition that the exhaust pressure is different, the second control valve can be automatically opened to complete the exhaust process of the accumulation-resistant gas under the condition that the exhaust pressure reaches the preset pressure value, and the second control valve can be closed to prevent the external gas from flowing back to the storage tank under the condition that the exhaust pressure does not reach the preset pressure value, thereby realizing the intelligent automatic control of the exhaust process.
Preferably, the first preset pressure value is 2-4 Kpa; and/or the second preset pressure value is 3-5 Kpa. This is a preferable range of the preset pressure value of the intake air and the preset pressure value of the exhaust air of the present invention.
The device for preventing acrylonitrile liquid from self-polymerization comprises acrylonitrile liquid storage equipment (an acrylonitrile storage tank 1), wherein the top of the equipment is provided with a nitrogen inlet and a gas outlet, the nitrogen inlet is connected with a nitrogen pressure regulating valve (a first control valve 2), the gas outlet is provided with a breather valve (a second control valve 3), the bottom of the equipment is provided with a conveying pipeline 4 for acrylonitrile liquid, an outer jacket pipe 5 for cooling water is arranged outside the conveying pipeline, and cooling water is introduced into the outer jacket pipe 5. The accumulation-resistant gas enters the acrylonitrile liquid storage equipment after passing through the nitrogen pressure regulating valve, when the gas pressure in the equipment is greater than the opening pressure of the breather valve, the breather valve is opened to release the pressure, and when the gas pressure in the equipment is less than the opening pressure of the nitrogen pressure regulating valve, the nitrogen pressure regulating valve is opened to supply the accumulation-resistant gas into the equipment, so that a certain pressure is maintained in the equipment. When the equipment conveys the acrylonitrile liquid outwards, the pressure in the equipment is reduced, when the opening pressure of the nitrogen regulating valve is reached, the nitrogen regulating valve is opened, the polymerization inhibiting gas is supplied into the equipment, and finally, a certain micro positive pressure of 2-5 KPaA is kept in the equipment. The opening pressure of the nitrogen regulating valve 2 is smaller than the opening pressure of the breather valve 3. In view of economy, the breather valve 3 is a one-way breather valve, the opening pressure of the breather valve is 3-5 KPaA, and the opening pressure of the nitrogen regulating valve 2 is 2-4 KPaA. The polymerization-inhibiting gas is nitrogen containing 0.0005 to 6.5 percent of oxygen. The temperature of the cooling water is 5-12 ℃.
The invention relates to the field of polyacrylonitrile fiber production, in particular to a method and a device for preventing acrylonitrile liquid from self-gathering in the processes of storage and transportation. The acrylonitrile storage tank top is equipped with nitrogen gas entry and gas outlet, and nitrogen gas entry linkage nitrogen gas governing valve, the breather valve are installed to the gas outlet, and the equipment bottom is equipped with pipeline, and the pipeline outside sets up double-layered sleeve pipe, lets in the cooling water in the outer jacket pipe. The polymerization-resistant gas enters the acrylonitrile liquid storage equipment through the nitrogen pressure regulating valve. The breather valve is characterized in that the breather valve is a one-way valve, and the opening pressure is 3-5 KPaA; the opening pressure of the nitrogen regulating valve is 2-4 KPaA; the polymerization inhibiting gas is nitrogen containing 0.0005 to 6.5 percent of oxygen; the temperature of the cooling water is 5-12 ℃. The invention can effectively prevent the occurrence of self-aggregation phenomenon in the storage and transportation processes of the acrylonitrile liquid, does not need to remove polymerization inhibitor when the acrylonitrile is used, ensures the product quality, has simple and convenient operation, saves energy, reduces consumption and has certain economical efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An apparatus for preventing acrylonitrile liquid from self-polymerization, comprising: the method comprises the following steps:
an acrylonitrile storage tank (1) for storing acrylonitrile; the device also comprises a first pipeline (101), wherein one end of the first pipeline (101) is communicated with the acrylonitrile storage tank (1) so as to introduce polymerization-resistant gas into the acrylonitrile storage tank (1).
2. The apparatus for preventing self-polymerization of acrylonitrile liquid according to claim 1, wherein:
the first pipeline (101) is also provided with a first control valve (2).
3. The apparatus for preventing self-polymerization of acrylonitrile liquid according to claim 1 or 2, wherein:
the device also comprises a second pipeline (102), wherein one end of the second pipeline (102) is also communicated with the acrylonitrile storage tank (1) so as to lead out the polymerization-resistant gas in the acrylonitrile storage tank (1).
4. The apparatus for preventing self-polymerization of acrylonitrile liquid according to claim 3, wherein:
a second control valve (3) is arranged on the second pipeline (102) or at the position where the second pipeline (102) is communicated with the acrylonitrile storage tank (1).
5. The apparatus for preventing self-polymerization of acrylonitrile liquid according to claim 4, wherein:
when the first control valve (2) is included, the first control valve (2) is a regulating valve, and the opening pressure is 2-4 Kpa; and/or the second control valve (3) is a one-way valve, and the opening pressure is 3-5 Kpa.
6. The apparatus for preventing self-polymerization of acrylonitrile liquid according to claim 3, wherein:
the position of the first pipeline (101) communicated with the acrylonitrile storage tank (1) is positioned at the top of the acrylonitrile storage tank (1); and/or the position where the second pipe (102) communicates with the acrylonitrile storage tank (1) is located at the top of the acrylonitrile storage tank (1).
7. The apparatus for preventing self-polymerization of acrylonitrile liquid according to any one of claims 1-6, wherein:
the bottom of the acrylonitrile storage tank (1) is communicated with a conveying pipeline (4), and the conveying pipeline (4) can guide and convey acrylonitrile in the acrylonitrile storage tank (1); an outer jacket sleeve (5) is sleeved outside the conveying pipeline (4), and cooling liquid is introduced into the outer jacket sleeve (5); and/or the polymerization inhibiting gas comprises a mixture of nitrogen and oxygen, wherein the concentration ratio of the oxygen is 0.0005 to 6.5 percent.
8. A control method suitable for the apparatus for preventing self-polymerization of acrylonitrile liquid according to any one of claims 1-7, characterized in that:
when the apparatus includes a first control valve (2), the control method includes: a detection step for detecting the pressure in the acrylonitrile storage tank (1); a judging step of judging the relation between the pressure in the acrylonitrile storage tank (1) and a first preset pressure value; controlling, if the pressure in the acrylonitrile storage tank (1) is smaller than the first preset pressure value, the first control valve (2) to be opened, and introducing polymerization-inhibiting gas into the acrylonitrile storage tank (1); and if the pressure in the acrylonitrile storage tank (1) is greater than or equal to the first preset pressure value, controlling the first control valve (2) to close.
9. The control method according to claim 8, characterized in that:
when the apparatus includes a second control valve (3), the control method includes: a detection step for detecting the pressure in the acrylonitrile storage tank (1); a judging step of judging the relation between the pressure in the second acrylonitrile storage tank (1) and a second preset pressure value; controlling, if the pressure in the acrylonitrile storage tank (1) is greater than or equal to the second preset pressure value, the second control valve (3) to be opened to lead out the polymerization-resistant gas in the acrylonitrile storage tank (1); and if the pressure in the acrylonitrile storage tank (1) is smaller than the second preset pressure value, controlling the second control valve (3) to close.
10. The control method according to claim 9, characterized in that:
the first preset pressure value is 2-4 Kpa; and/or the second preset pressure value is 3-5 Kpa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010646823.7A CN111924349A (en) | 2020-07-07 | 2020-07-07 | Device for preventing acrylonitrile liquid from self-polymerization and control method |
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| CN202010646823.7A CN111924349A (en) | 2020-07-07 | 2020-07-07 | Device for preventing acrylonitrile liquid from self-polymerization and control method |
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| US4176081A (en) * | 1977-07-15 | 1979-11-27 | The Lubrizol Corporation | Solutions of acrylamidoalkanesulfonic acid salts in organic liquids and method for their preparation |
| US4354005A (en) * | 1981-10-09 | 1982-10-12 | Cosden Technology, Inc. | Method for controlling adduct formation in production of acrylonitrile-butadiene-styrene-acrylate copolymers |
| CN1701058A (en) * | 2002-01-08 | 2005-11-23 | 三菱化学株式会社 | Method for preventing clogging of apparatus for handling (meth) acrylic acid and esters thereof |
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Application publication date: 20201113 |
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