CN116271917A - Device and control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization - Google Patents
Device and control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization Download PDFInfo
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- CN116271917A CN116271917A CN202310213509.3A CN202310213509A CN116271917A CN 116271917 A CN116271917 A CN 116271917A CN 202310213509 A CN202310213509 A CN 202310213509A CN 116271917 A CN116271917 A CN 116271917A
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- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 title claims abstract description 233
- 238000006116 polymerization reaction Methods 0.000 title claims abstract description 90
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 25
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007380 fibre production Methods 0.000 title claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 230000005764 inhibitory process Effects 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims abstract description 9
- 239000012595 freezing medium Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 64
- 239000003112 inhibitor Substances 0.000 claims description 27
- 239000002351 wastewater Substances 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 230000002401 inhibitory effect Effects 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 4
- JFIOVJDNOJYLKP-UHFFFAOYSA-N bithionol Chemical group OC1=C(Cl)C=C(Cl)C=C1SC1=CC(Cl)=CC(Cl)=C1O JFIOVJDNOJYLKP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 230000008676 import Effects 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N 1,4-Benzenediol Natural products OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002744 anti-aggregatory effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical group [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000687 hydroquinonyl group Chemical group C1(O)=C(C=C(O)C=C1)* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/04—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of synthetic polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Fibers (AREA)
Abstract
The invention provides a device and a control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization. Wherein the acrylonitrile stratified tank is used for separating recovered acrylonitrile from water, and the acrylonitrile stratified tank has first import, first export and second export. At least one acrylonitrile temporary storage tank is used for temporarily storing the recovered acrylonitrile, and an acrylonitrile storage tank is used for storing the recovered acrylonitrile. The acrylonitrile storage tank, the acrylonitrile temporary storage tank and the acrylonitrile layering tank are respectively provided with a second inlet for inputting a freezing medium. Wherein, the acrylonitrile temporary storage tank and the acrylonitrile layering tank are respectively provided with a gas inlet for introducing polymerization inhibition gas. According to the invention, the cooling medium and the polymerization inhibition gas are added in the main recovery procedures of the acrylonitrile layering tank, the acrylonitrile temporary storage tank and the acrylonitrile storage tank in the acrylonitrile recovery process for real-time control, so that the self-polymerization in the acrylonitrile recovery process is prevented.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to a device for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization. Meanwhile, the invention also relates to a control method for preventing the self-polymerization of the acrylonitrile recovered in the production by adopting the device.
Background
In order to reduce the production cost and meet the environmental protection requirement, the mixed solution of DMSO, AN and water is produced in the production process of PAN-based carbon fiber precursor, AN in the solution is required to be recovered, and because the acrylonitrile is unstable in nature, self-polymerization is easy to occur under the actions of high temperature, illumination, radiation and the like. In order to prevent self-polymerization in the AN recovery process, the tower top adopts negative pressure operation, the operation temperature is reduced, a certain proportion of polymerization inhibitor is added in the recovered AN, the most commonly used polymerization inhibitor is hydroquinone (HQ for short), and the most commonly used polymerization inhibitor is directly added into AN acrylonitrile storage tank after reduced pressure distillation recovery.
In the prior art, polymerization inhibition gas is introduced into the stored acrylonitrile to prevent the acrylonitrile liquid from self-polymerizing in the storage and transportation processes, but in the recovery process of the acrylonitrile, the self-polymerizing occurs because the acrylonitrile layering is not obvious. In addition, the polymerization inhibitor is easy to generate more polymers in the recovery process, and equipment pipelines are easy to be blocked, so that the problem of long-period safe and stable operation of an acrylonitrile recovery system is seriously affected.
Disclosure of Invention
In view of the above, the invention provides a device and a control method for preventing the self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber, so as to overcome the phenomenon that the self-polymerization reaction of acrylonitrile occurs in the recovery process in the prior art and prevent the unstable system operation caused by the equipment blockage in the recovery system.
An apparatus for preventing the self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber, comprising,
an acrylonitrile stratified tank for separating recovered acrylonitrile from water, the acrylonitrile stratified tank having a first inlet, a first outlet, and a second outlet;
the acrylonitrile temporary storage tank is used for temporarily storing recovered acrylonitrile, a valve is arranged on the top of the acrylonitrile temporary storage tank and used for connecting or disconnecting the acrylonitrile temporary storage tank and the high-efficiency polymerization inhibitor; the first outlet is communicated with at least one acrylonitrile temporary storage tank;
an acrylonitrile storage tank for storing recovered acrylonitrile;
the acrylonitrile storage tank, the acrylonitrile temporary storage tank and the acrylonitrile layering tank are respectively provided with a second inlet for inputting a freezing medium;
the acrylonitrile temporary storage tank, the acrylonitrile temporary storage tank and the acrylonitrile layering tank are respectively provided with a gas inlet for introducing polymerization inhibition gas.
Furthermore, a tank outer jacket is arranged at the second inlet, the freezing medium adopts frozen water, and the frozen water flows into the acrylonitrile storage tank, the acrylonitrile temporary storage tank and the acrylonitrile layering tank through the tank outer jacket.
Further, the recovered acrylonitrile passes through the acrylonitrile layering tank, the acrylonitrile temporary storage tank and the acrylonitrile storage tank in sequence, and the number of the acrylonitrile temporary storage tanks is two.
Further, a wastewater tank is also included, the wastewater tank is in communication with the second outlet of the acrylonitrile layering tank, and the wastewater tank has a gas inlet for introducing a polymerization inhibiting gas.
Further, the gas storage tank is used for storing the polymerization inhibition gas, and the gas storage tank is further provided with a regulating valve and a flowmeter.
Further, the temperature in the acrylonitrile storage tank, the acrylonitrile temporary storage tank and the acrylonitrile layering tank is less than or equal to 15 ℃.
Furthermore, INH2 is adopted as the efficient polymerization inhibitor.
Further, the polymerization inhibition gas is an MN gas tank, is mixed by IA and nitrogen according to a certain proportion, and contains 3% -10% of oxygen-nitrogen mixed gas.
According to the invention, cooling media are introduced into each recovery tank in the acrylonitrile recovery process to cool, so that low-temperature operation is realized, and polymerization inhibition gas is added in the whole recovery process, thereby being beneficial to preventing acrylonitrile from self-polymerization. And the high-efficiency polymerization inhibitor is added into the acrylonitrile temporary storage tank, so that the polymerization inhibitor has the advantages of less consumption, good polymerization inhibition effect and convenient operation compared with the polymerization inhibitor in the prior art. Can overcome the system pipeline blockage caused by polymer deposition in the acrylonitrile recovery process, and ensure the long-period stable operation of the acrylonitrile recovery system.
Meanwhile, the invention also provides a control method of the device for preventing the acrylonitrile recovered in the PAN-based carbon fiber production from self-polymerization, which comprises the following steps:
step one: separating acrylonitrile by the acrylonitrile layering tank, reducing the temperature in the acrylonitrile layering tank to below 15 ℃, introducing the polymerization inhibiting gas, and separating water and acrylonitrile in the acrylonitrile layering tank;
step two: the separated acrylonitrile flows out through a first outlet and is conveyed to two acrylonitrile temporary storage tanks, wherein one acrylonitrile temporary storage tank reduces the temperature in the tank to below 15 ℃ through a cooling medium in a jacket outside the tank; meanwhile, a high-efficiency polymerization inhibitor is added periodically;
step three: when the liquid level of the acrylonitrile temporary storage tank reaches 80%, conveying acrylonitrile into the acrylonitrile storage tank; and a cooling medium is introduced through the second inlet, polymerization inhibition gas is introduced through the gas inlet, the temperature in the recovered acrylonitrile tank is reduced to below 15 ℃, and the acrylonitrile is stored.
Further, the water separated in the acrylonitrile temporary storage tank is discharged to a waste water tank through a second outlet, polymerization inhibition gas enters the waste water tank through the gas inlet, and the waste water pump is used for conveying the water in the waste water tank to the top of the AN tower condenser for circularly cleaning the condenser.
Drawings
The accompanying drawings, which 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. In the drawings:
FIG. 1 is a schematic flow diagram of acrylonitrile recovery according to an embodiment of the present invention;
fig. 2 is a control diagram of connection between cooling water and polymerization inhibiting gas and each tank of a device for preventing acrylonitrile recovered in PAN-based carbon fiber production according to an embodiment of the present invention.
Reference numerals illustrate:
1. an acrylonitrile layering tank; 2. an acrylonitrile temporary storage tank; 3. an acrylonitrile storage tank; 4. a waste water tank; 5. a gas storage tank; 6. and (5) a nitrogen steel cylinder.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The experimental methods in the following examples are conventional methods unless otherwise specified. Unless specifically stated otherwise, the terms and processes used in the present embodiments are understood according to the common knowledge and conventional methods in the art.
The embodiment relates to a device for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerizing, which comprises an acrylonitrile layering tank 1, an acrylonitrile temporary storage tank 2 and an acrylonitrile storage tank 3. Wherein the acrylonitrile stratified tank 1 is used for separating the recovered acrylonitrile from water, and the acrylonitrile stratified tank 1 has a first inlet, a first outlet, and a second outlet.
The at least one acrylonitrile temporary storage tank 2 is used for temporarily storing the recovered acrylonitrile, a valve is arranged on the top of the acrylonitrile temporary storage tank 2 and is used for connecting or disconnecting the acrylonitrile temporary storage tank 2 with the high-efficiency polymerization inhibitor; the first outlet is communicated with at least one acrylonitrile temporary storage tank 2. An acrylonitrile storage tank 3 for storing recovered acrylonitrile.
Meanwhile, the acrylonitrile storage tank 3, the acrylonitrile temporary storage tank 2 and the acrylonitrile layering tank 1 are respectively provided with a second inlet for inputting a freezing medium. Wherein, the acrylonitrile temporary storage tank 2 and the acrylonitrile layering tank 1 are respectively provided with a gas inlet for introducing polymerization inhibition gas.
According to the device for preventing the self-polymerization of the acrylonitrile recovered in the production of the PAN-based carbon fiber, the cooling medium and the polymerization inhibition gas are added in the main recovery procedures of the acrylonitrile layering tank 1, the acrylonitrile temporary storage tank 2 and the acrylonitrile storage tank 3 in the acrylonitrile recovery process for real-time control so as to prevent the self-polymerization in the acrylonitrile recovery process. In addition, in order to achieve better storage effect, the efficient polymerization inhibitor is added into the acrylonitrile temporary storage tank 2, so that the problems of low termination speed of free radical reaction and poor polymerization inhibition effect of the polymerization inhibitor such as hydroquinone adopted in the prior art can be avoided.
Based on the above overall description, an apparatus for preventing the self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to this embodiment, as shown in fig. 1, includes the following steps: the top steam of the acrylonitrile removing tower is condensed by a tower condenser and then enters an acrylonitrile layering tank 1, acrylonitrile separated by the acrylonitrile layering tank 1 flows into an acrylonitrile temporary storage tank 2, and the acrylonitrile white conveying pump flowing through the acrylonitrile temporary storage tank 2 is conveyed to an acrylonitrile storage tank 3.
As a preferred embodiment, the second inlet of this example is provided with a tank outer jacket, and the freezing medium is chilled water, which flows into the acrylonitrile storage tank 3, the acrylonitrile temporary storage tank 2, and the acrylonitrile layering tank 1 through the tank outer jacket. As a specific embodiment, the freezing medium of this example is transported using an out-of-tank jacket. The jacket outside the tank is a common part in the existing tank structure.
As a preferred embodiment, the temperature in the acrylonitrile storage tank 3, the acrylonitrile temporary storage tank 2 and the acrylonitrile layering tank 1 is cooled by cooling water, and the temperature in the tank is less than or equal to 15 ℃. Specifically, chilled water is introduced into the inner coil pipes in the tank bodies so as to facilitate the control implementation of the temperature in the tank bodies. As shown in fig. 2, chilled water entering each tank is indicated as "CW" in fig. 2. Chilled water exiting each tank is indicated as "CWR" in fig. 2.
In addition, as in the above-described process for recovering acrylonitrile, the recovered acrylonitrile in this embodiment is layered sequentially in the acrylonitrile layering tank 1, in this embodiment, the tank jacket is used to convey cooling water for cooling, the temperature in the tank is controlled below 15 ℃ after cooling, and polymerization-inhibiting gas is introduced through the gas inlet, thereby performing synergistic protection, and thus, the acrylonitrile in the tank of the acrylonitrile layering tank 1 is prevented from self-polymerizing. Because of the characteristic that the densities of the acrylonitrile and the water are different, the acrylonitrile positioned on the upper layer overflows into the acrylonitrile temporary storage tank 2. Specifically, the acrylonitrile temporary storage tank 2 of the present embodiment is provided in two.
Acrylonitrile flows into two acrylonitrile temporary storage tanks 2 from the acrylonitrile layering tank 1, one acrylonitrile temporary storage tank 2 is a tank body for storing an acrylonitrile solution, and if the other acrylonitrile temporary storage tank 2 is blocked or damaged, the other acrylonitrile temporary storage tank 2 can be used as the supplement of the acrylonitrile recovery system, so that the equipment operation stability of the acrylonitrile recovery system is further ensured. And the acrylonitrile in the acrylonitrile temporary storage tank 2 is conveyed into the acrylonitrile storage tank 3 through a conveying pump.
In addition, as shown in fig. 2, for convenience of implementation, the acrylonitrile temporary storage tank 2 of the present embodiment is provided with a pipe to which the efficient polymerization inhibitor is added, and a funnel for placing the efficient polymerization inhibitor is provided above the pipe. And be equipped with the control valve that can break-make this pipeline on this pipeline, adopt automatically controlled stop valve in this embodiment to realize the automation.
As a preferred embodiment, INH2 is used as the high-efficiency polymerization inhibitor of this example. And the high-efficiency polymerization inhibitor is copper-iron solution, which is preferably used in an amount of 10-20 g/tank. When cooling water flows into the acrylonitrile temporary storage tank 2 through the inner coil pipe, and when the temperature in the tank is lower than 15 ℃, the high-efficiency polymerization inhibitor is added into the acrylonitrile temporary storage tank 2, so that the reaction chain of the acrylonitrile self-polymerization is terminated conveniently. Meanwhile, the anti-aggregation gas is input into the tank through the gas inlet of the tank body, so that cooperative protection is carried out, and self-aggregation is prevented.
In addition, by introducing the high-efficiency polymerization inhibitor into the acrylonitrile temporary storage tank 2, the concentration of the recovered acrylonitrile can be high and can reach more than 96%. And the polymerization inhibition gas and cooling water are introduced to carry out cooperative protection so as to improve the probability of preventing acrylonitrile from self-polymerization. And, because this high-efficient polymerization inhibitor adds in the acrylonitrile temporary storage tank, from the beginning of retrieving acrylonitrile to acrylonitrile is stored in-process existence in retrieving acrylonitrile all the time, need not to increase again. The process steps in the acrylonitrile recovery process are reduced.
In addition, for convenience of installation, an apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fibers of the present embodiment further includes a wastewater tank 4, the wastewater tank 4 being in communication with the second outlet of the acrylonitrile layering tank 1, the wastewater tank 4 having a gas inlet to which a polymerization-inhibiting gas is introduced. In a specific structure, since the acrylonitrile in the acrylonitrile stratified tank 1 is separated from water, water in the lower layer flows out from the second outlet and is discharged to the wastewater tank 4.
The waste water tank 4 also has a gas inlet through which a polymerization inhibitor gas can be introduced, and the protection of the polymerization inhibitor gas can prevent the self-polymerization of a part of acrylonitrile remaining in the separated water. The water passing through the wastewater tank 4 is protected, and most of the water is conveyed to the top of the AN tower condenser through a wastewater pump, circulated and clear condenser and cooled into gas phase, and the rest of the water flows back to the AN tower feeding pipeline for continuous rectification.
In addition, the device for preventing the acrylonitrile recovered in the production of the PAN-based carbon fiber from self-polymerization further comprises a gas storage tank 5, wherein the gas storage tank 5 is used for storing polymerization-inhibiting gas, and the gas storage tank 5 is further provided with a regulating valve and a flowmeter. Preferably, the polymerization inhibiting gas is MN gas tank, which is mixed by IA and nitrogen in certain proportion and contains 3-10% of oxygen-nitrogen mixed gas. Through setting up governing valve and flowmeter, can carry out accurate control to the nitrogen gas and oxygen mixture in the above-mentioned range value in the gas storage to play better polymerization inhibition effect. And, nitrogen is provided with a spare high purity nitrogen cylinder 6. When the nitrogen line has problems, high-purity nitrogen can be rapidly switched, and qualified and continuous supply of MN gas is ensured.
In addition, the embodiment also relates to a control method of a device for preventing the self-polymerization of the acrylonitrile recovered in the production of PAN-based carbon fiber, which comprises the following specific steps:
step one: separating acrylonitrile by an acrylonitrile layering tank 1, reducing the temperature of a cooling medium to below 15 ℃, introducing polymerization-inhibiting gas, and separating water and acrylonitrile in the acrylonitrile layering tank 1;
step two: the separated acrylonitrile flows out through a first outlet and is conveyed to two acrylonitrile temporary storage tanks 2, wherein one acrylonitrile temporary storage tank 2 reduces the temperature in the tank to below 15 ℃ through a cooling medium in a jacket outside the tank; meanwhile, a high-efficiency polymerization inhibitor is added periodically;
step three: when the liquid level of the acrylonitrile temporary storage tank 2 reaches 80%, conveying the acrylonitrile into the acrylonitrile storage tank 3; and a cooling medium is introduced through the second inlet, polymerization inhibition gas is introduced through the gas inlet, the temperature in the recovered acrylonitrile tank is reduced to below 15 ℃, and the acrylonitrile is stored.
In the second step, the water separated in the acrylonitrile temporary storage tank 2 is discharged to the wastewater tank 4 through the second outlet, the polymerization inhibiting gas enters the wastewater tank 4 through the gas inlet, and the wastewater pump conveys the water in the wastewater tank 4 to the top of the AN tower condenser for circulating and cleaning the condenser.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Claims (10)
1. An apparatus for preventing the self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fibers, characterized in that: comprising the steps of (a) a step of,
an acrylonitrile layering tank (1) for separating recovered acrylonitrile from water, the acrylonitrile layering tank (1) having a first inlet, a first outlet and a second outlet;
the system comprises an acrylonitrile temporary storage tank (2), at least one acrylonitrile temporary storage tank (2) is used for temporarily storing recovered acrylonitrile, a valve is arranged on the top of the acrylonitrile temporary storage tank (2), and the valve is used for connecting or disconnecting the acrylonitrile temporary storage tank (2) and a high-efficiency polymerization inhibitor; the first outlet is communicated with at least one acrylonitrile temporary storage tank (2);
an acrylonitrile storage tank (3) for storing recovered acrylonitrile;
the acrylonitrile storage tank (3), the acrylonitrile temporary storage tank (2) and the acrylonitrile layering tank (1) are respectively provided with a second inlet for inputting a freezing medium;
the acrylonitrile temporary storage tank (2), the acrylonitrile temporary storage tank (2) and the acrylonitrile layering tank (1) are respectively provided with a gas inlet for introducing polymerization inhibition gas.
2. An apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 1, wherein:
the second inlet is provided with a tank outer jacket, the freezing medium adopts chilled water, and the chilled water flows into the acrylonitrile storage tank (3), the acrylonitrile temporary storage tank (2) and the acrylonitrile layering tank (1) through the tank outer jacket.
3. An apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 1, wherein:
the acrylonitrile recovery device is characterized in that the acrylonitrile recovery device sequentially passes through the acrylonitrile layering tank (1), the acrylonitrile temporary storage tank (2) and the acrylonitrile storage tank (3), and the number of the acrylonitrile temporary storage tanks (2) is two.
4. An apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 1, wherein:
the device further comprises a wastewater tank (4), wherein the wastewater tank (4) is communicated with the second outlet of the acrylonitrile layering tank (1), and the wastewater tank (4) is provided with a gas inlet communicated with polymerization inhibition gas.
5. An apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 1, wherein:
the gas storage device further comprises a gas storage tank (5), wherein the gas storage tank (5) is used for storing the polymerization inhibition gas, and the gas storage tank (5) is further provided with a regulating valve and a flowmeter.
6. The apparatus for preventing self-polymerization of acrylonitrile recovered in production of PAN-based carbon fiber according to any one of claims 1 to 5, wherein the temperature in the acrylonitrile storage tank (3), the acrylonitrile temporary storage tank (2) and the acrylonitrile layering tank (1) is 15 ℃ or less.
7. The apparatus for preventing the self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 6, wherein the high-efficiency polymerization inhibitor is INH2.
8. The apparatus for preventing self-polymerization of acrylonitrile recovered in PAN-based carbon fiber production according to claim 6, wherein the polymerization inhibitor gas is MN gas tank, and is mixed by IA and nitrogen according to a certain proportion, and the mixture gas contains 3% -10% of oxygen and nitrogen.
9. A control method of an apparatus for preventing self-polymerization of acrylonitrile recovered in PAN-based carbon fiber production according to claim 1, characterized by:
step one: separating acrylonitrile by the acrylonitrile layering tank (1), reducing the temperature in the acrylonitrile layering tank (1) to below 15 ℃, introducing the polymerization inhibiting gas, and separating water and acrylonitrile in the acrylonitrile layering tank (1);
step two: the separated acrylonitrile flows out through a first outlet and is conveyed to two acrylonitrile temporary storage tanks (2), wherein one acrylonitrile temporary storage tank (2) reduces the temperature in the tank to below 15 ℃ through a cooling medium in a jacket outside the tank; meanwhile, a high-efficiency polymerization inhibitor is added periodically;
step three: when the liquid level of the acrylonitrile temporary storage tank (2) reaches 80%, conveying acrylonitrile into the acrylonitrile storage tank (3); and a cooling medium is introduced through the second inlet, polymerization inhibition gas is introduced through the gas inlet, the temperature in the recovered acrylonitrile tank is reduced to below 15 ℃, and the acrylonitrile is stored.
10. The control method of an apparatus for preventing self-polymerization of acrylonitrile recovered in the production of PAN-based carbon fiber according to claim 9, wherein:
the water separated in the acrylonitrile temporary storage tank (2) is discharged to the wastewater tank (4) through a second outlet, polymerization inhibition gas enters the wastewater tank (4) through the gas inlet, and the wastewater pump is used for conveying the water in the wastewater tank (4) to the top of the AN tower condenser for circularly cleaning the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310213509.3A CN116271917A (en) | 2023-03-07 | 2023-03-07 | Device and control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310213509.3A CN116271917A (en) | 2023-03-07 | 2023-03-07 | Device and control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization |
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| Publication Number | Publication Date |
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| CN116271917A true CN116271917A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310213509.3A Pending CN116271917A (en) | 2023-03-07 | 2023-03-07 | Device and control method for preventing acrylonitrile recovered in PAN-based carbon fiber production from self-polymerization |
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| Country | Link |
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| CN (1) | CN116271917A (en) |
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2023
- 2023-03-07 CN CN202310213509.3A patent/CN116271917A/en active Pending
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