CN220634284U - Ammoniation device of polyacrylonitrile polymer liquid - Google Patents
Ammoniation device of polyacrylonitrile polymer liquid Download PDFInfo
- Publication number
- CN220634284U CN220634284U CN202321065742.3U CN202321065742U CN220634284U CN 220634284 U CN220634284 U CN 220634284U CN 202321065742 U CN202321065742 U CN 202321065742U CN 220634284 U CN220634284 U CN 220634284U
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- CN
- China
- Prior art keywords
- polyacrylonitrile polymer
- polyacrylonitrile
- polymer liquid
- liquid
- spinneret
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- 229920002239 polyacrylonitrile Polymers 0.000 title claims abstract description 83
- 239000007788 liquid Substances 0.000 title claims abstract description 57
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000010521 absorption reaction Methods 0.000 claims description 24
- 238000006116 polymerization reaction Methods 0.000 claims description 21
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 239000002243 precursor Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 26
- 239000002904 solvent Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- 238000009987 spinning Methods 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- 238000004176 ammonification Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Landscapes
- Polymerisation Methods In General (AREA)
Abstract
The utility model discloses an ammonifying device of polyacrylonitrile polymer liquid, which relates to the technical field of polyacrylonitrile precursor preparation, wherein in the step 1, the polyacrylonitrile polymer liquid is conveyed to a spinneret in a storage tank through a pump, and the polyacrylonitrile polymer liquid is sprayed out of the spinneret in a filament shape; step 2, ammonia gas is metered into a storage tank through a flowmeter, fully contacts with the filiform polyacrylonitrile polymer solution and is absorbed; and 3, pumping the mixed liquid into a mixer, and uniformly mixing the mixed liquid to realize uniform ammoniation of the polyacrylonitrile polymer liquid. The ammoniation device for the polyacrylonitrile polymer liquid effectively solves the technical problem that the ammonia gas is poor in introducing stability when the existing polyacrylonitrile polymer liquid is ammoniated, thereby improving the uniformity and stability of an ammoniation process and laying a foundation for producing stable and high-performance PAN precursor.
Description
Technical Field
The utility model relates to the technical field of polyacrylonitrile precursor preparation, in particular to an ammonifying device of polyacrylonitrile polymer liquid.
Background
Carbon fibers have numerous excellent properties such as low density, high specific strength, high specific modulus, high temperature resistance, corrosion resistance and the like, and have been widely used in various fields of aerospace, national defense and military industry and civil industry. Carbon fibers can be divided into three major types, polyacrylonitrile (PAN) based, pitch based, and viscose based, by raw material route. Among them, PAN-based carbon fiber has become a carbon fiber with the fastest development, highest yield, most varieties and the widest application because of the characteristics of simple production process, lower production cost and excellent mechanical properties.
At present, the existing patent numbers are: chinese patent CN104611779B discloses an ammonification method and apparatus for polyacrylonitrile spinning solution, comprising: step 1: dissolving acrylonitrile and comonomer in solvent in a polymerization kettle, and adding initiator to carry out multi-component solution copolymerization to obtain polyacrylonitrile polymer solution; step 2: removing monomers and defoaming the polyacrylonitrile polymer solution to form a polyacrylonitrile spinning solution, and placing the polyacrylonitrile spinning solution in a storage kettle for standby; step 3: adding a certain amount of solvent into a liquid storage tank, wherein the solvent is the same as the solvent in the step 1, and mixing a certain amount of ammonia water into the solvent to prepare a solution with known ammonia concentration; step 4: and (3) respectively and fully mixing the polyacrylonitrile spinning solution prepared in the step (2) and the solution with known ammonia concentration prepared in the step (3), so as to realize uniform ammoniation of the polyacrylonitrile spinning solution. The method of the utility model can accurately control the ammoniation amount, obviously improve the hydrophilicity of the polymer liquid, shorten the ammoniation time and improve the working efficiency.
The prior patent number is: chinese patent CN202152326U discloses an ammonifying treatment device for polyacrylonitrile polymer solution, comprising a spray tower, an ammonia gas cylinder, a polymerizer, two metering gear pumps and a mixer; the tower mouth of the spray tower is provided with a pipeline for inputting solvent into the spray tower; the gas outlet of the ammonia gas cylinder is communicated with the spray tower and is used for introducing ammonia gas into the spray tower and mixing the ammonia gas with a solvent to prepare NH3 solution; the output end of the spray tower and the output end of the polymerization kettle are respectively connected with the input ends of two metering gear pumps, the output ends of the two gear pumps are communicated to the mixer, and the output ends of the two gear pumps are used for conveying NH3 solution in the spray tower and polyacrylonitrile polymer solution in the polymerization kettle to the mixer through the first metering gear pump and the second metering gear pump. The device of the utility model can realize the uniform and stable ammoniation of PAN polymerization liquid without pollution, thereby improving the hydrophilicity of PAN spinning liquid and laying the foundation for producing stable and high-performance PAN precursor and carbon fiber
However, in the implementation process of the technical scheme, at least the following technical problems are found:
the ammonia gas is poor in stability: when the existing polyacrylonitrile polymer solution is ammoniated, the ammonia port needs to be immersed in the feed liquid, so that the ammonia port is easy to be blocked by the polyacrylonitrile polymer solution, the flow control is unstable, ammoniated gel is easy to form, and the like.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides an ammonifying device of polyacrylonitrile polymer liquid, which solves the technical problem that the ammonia gas is poor in introducing stability when the existing polyacrylonitrile polymer liquid is ammonified.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
an ammonifying apparatus for polyacrylonitrile polymer liquid, the ammonifying apparatus comprising:
a polymerization kettle;
the absorption tank is communicated with the polymerization kettle through a pipeline; and
the mixer is communicated with the absorption tank through a pipeline and is used for ammonifying the polyacrylonitrile polymer liquid;
wherein, a spinneret is arranged in the absorption tank, and the spinneret is used for spraying polyacrylonitrile polymerized liquid in a thread shape;
the absorption tank is connected with an ammonia gas bottle through a pipeline and is used for conveying ammonia gas into the absorption tank so as to enable the ammonia gas to be in contact with the polyacrylonitrile polymer liquid.
Preferably, a metering pump is arranged on a pipeline between the polymerization kettle and the spinneret and is used for controlling the speed of the polyacrylonitrile polymerization liquid entering the spinneret.
Preferably, a gear pump is arranged on a pipeline between the absorption tank and the mixer and is used for mixing ammonia gas and polyacrylonitrile polymerization liquid.
Preferably, a flowmeter is arranged on a pipeline between the ammonia gas cylinder and the absorption tank and is used for the speed of ammonia entering the absorption tank.
Step 1, conveying polyacrylonitrile polymer liquid to a spinneret in a storage tank through a pump, and spraying the polyacrylonitrile polymer liquid out of the spinneret in a thread shape;
step 2, ammonia gas is metered into a storage tank through a flowmeter, fully contacts with the filiform polyacrylonitrile polymer solution and is absorbed;
and 3, pumping the mixed liquid into a mixer, and uniformly mixing the mixed liquid to realize uniform ammoniation of the polyacrylonitrile polymer liquid.
(III) beneficial effects
Because the polyacrylonitrile polymer liquid is conveyed to the inner spinneret of the storage tank through the pump, the polyacrylonitrile polymer liquid is sprayed out of the spinneret in a thread shape, ammonia gas is metered into the storage tank through the flowmeter and fully contacts with the thread-shaped polyacrylonitrile polymer liquid for absorption, and the mixed liquid is pumped into the mixer for uniform mixing in the mixer, so that uniform ammoniation of the polyacrylonitrile polymer liquid is realized, the technical problem that the ammonia gas is poor in introducing stability during ammoniation of the existing polyacrylonitrile polymer liquid is effectively solved, the uniformity and stability of an ammoniation process are further improved, and a foundation is laid for producing stable and high-performance PAN precursor.
Drawings
The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the present utility model, as it is embodied in the following description, with reference to the preferred embodiments of the present utility model and the accompanying drawings.
Fig. 1 is an overall structural diagram of an embodiment of the present utility model.
Legend description: 1. a polymerization kettle; 2. a metering pump; 3. a spinneret; 4. an ammonia cylinder; 5. a flow meter; 6. an absorption tank; 7. a gear pump; 8. a mixer.
Detailed Description
According to the ammonifying device for the polyacrylonitrile polymer liquid, the technical problem that ammonia gas is poor in introducing stability when the existing polyacrylonitrile polymer liquid is ammonified is effectively solved, when the existing polyacrylonitrile polymer liquid is ammonified, the polyacrylonitrile polymer liquid is conveyed to the inner spinneret of the storage tank through the pump, the polyacrylonitrile polymer liquid is sprayed out of the spinneret in a thread shape, ammonia gas is metered into the storage tank through the flowmeter and fully contacts with the thread-shaped polyacrylonitrile polymer liquid, the ammonia gas is absorbed, the mixture is pumped into the mixer, and is uniformly mixed in the mixture, so that uniform ammonification of the polyacrylonitrile polymer liquid is achieved, uniformity and stability of an ammonification procedure are improved, and a foundation is laid for producing stable and high-performance PAN (poly (acrylic acid) precursors.
Step 1: in a polymerization kettle 1, polyacrylonitrile polymer solution formed by polymerizing acrylonitrile, comonomer and initiator in a solvent is conveyed to a spinneret 3 in a storage tank through a metering pump 2, and the polyacrylonitrile polymer solution is sprayed out of the spinneret 3 in a thread shape;
step 2: the ammonia gas is metered into a storage tank through a flowmeter 5, fully contacts with the filiform polyacrylonitrile polymer solution and is absorbed;
step 3: the mixture of the acrylonitrile polymer liquid and the ammonia is pumped into a mixer 8, and is uniformly mixed in the mixer 8, so that the uniform ammoniation of the polyacrylonitrile polymer liquid is realized.
The ammoniation method of the polyacrylonitrile polymer solution and the device structure schematic diagram for realizing the method are disclosed.
In FIG. 1, polyacrylonitrile polymer liquid in a polymerization kettle 1 is conveyed to a spinneret 3 in an absorption tank 6 through a metering pump 2, and the polyacrylonitrile polymer liquid is sprayed out in a thread shape; ammonia in the ammonia bottle 4 is conveyed into an absorption tank 6 through a flowmeter 5, fully contacts with filiform polyacrylonitrile polymer liquid and is absorbed; the mixed solution is conveyed to a mixer 8 through a gear pump 7 and is uniformly mixed in the mixer 8, so that uniform ammoniation of the polyacrylonitrile polymer solution is realized.
Examples
The technical scheme in the embodiment of the application is to effectively solve the technical problem that the ammonia gas is poor in introducing stability when the existing polyacrylonitrile polymer solution is ammoniated, and the overall thought is as follows:
the polymerization liquid is conveyed to a spinneret 3 in an absorption tank 6 through a metering pump 2, and the polyacrylonitrile polymerization liquid is sprayed out in a thread shape;
ammonia in the ammonia bottle 4 is conveyed into an absorption tank 6 through a flowmeter 5, fully contacts with filiform polyacrylonitrile polymer liquid and is absorbed;
the mixed solution is conveyed to a mixer 8 through a gear pump 7 and is uniformly mixed in the mixer 8, so that uniform ammoniation of the polyacrylonitrile polymer solution is realized.
Examples
The technical scheme in the embodiment of the application is to effectively solve the technical problem that the ammonia gas is poor in introducing stability when the existing polyacrylonitrile polymer solution is ammoniated, and the overall thought is as follows:
the polymerization liquid is conveyed to a spinneret 3 in an absorption tank 6 through a metering pump 2, and the polyacrylonitrile polymerization liquid is sprayed out in a thread shape;
ammonia in the ammonia bottle 4 is conveyed into an absorption tank 6 through a flowmeter 5, fully contacts with filiform polyacrylonitrile polymer liquid and is absorbed;
the mixed solution is conveyed to a mixer 8 through a gear pump 7 and is uniformly mixed in the mixer 8, so that uniform ammoniation of the polyacrylonitrile polymer solution is realized.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present utility model and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (4)
1. An ammonifying apparatus for a polyacrylonitrile polymer solution, comprising:
a polymerization kettle (1);
an absorption tank (6) communicated with the polymerization kettle (1) through a pipeline; and
a mixer (8) which is communicated with the absorption tank (6) through a pipeline and is used for ammonifying the polyacrylonitrile polymer solution;
wherein, a spinneret (3) is arranged in the absorption tank (6), and the spinneret (3) is used for spraying polyacrylonitrile polymer liquid in a thread shape;
the absorption tank (6) is connected with the ammonia gas cylinder (4) through a pipeline and is used for conveying ammonia gas into the absorption tank (6) so as to enable the ammonia gas to be in contact with the polyacrylonitrile polymer liquid.
2. An ammonifying apparatus of polyacrylonitrile polymer solution as claimed in claim 1, wherein: a metering pump (2) is arranged on a pipeline between the polymerization kettle (1) and the spinneret (3) and is used for controlling the speed of the polyacrylonitrile polymerization liquid entering the spinneret (3).
3. An ammonifying apparatus of polyacrylonitrile polymer solution as claimed in claim 1, wherein: a gear pump (7) is arranged on a pipeline between the absorption tank (6) and the mixer (8) and is used for mixing ammonia gas and polyacrylonitrile polymerization liquid.
4. An ammonifying apparatus of polyacrylonitrile polymer solution as claimed in claim 1, wherein: and a flowmeter (5) is arranged on a pipeline between the ammonia bottle (4) and the absorption tank (6) and is used for detecting the speed of ammonia entering the absorption tank (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321065742.3U CN220634284U (en) | 2023-05-06 | 2023-05-06 | Ammoniation device of polyacrylonitrile polymer liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321065742.3U CN220634284U (en) | 2023-05-06 | 2023-05-06 | Ammoniation device of polyacrylonitrile polymer liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220634284U true CN220634284U (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321065742.3U Active CN220634284U (en) | 2023-05-06 | 2023-05-06 | Ammoniation device of polyacrylonitrile polymer liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220634284U (en) |
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2023
- 2023-05-06 CN CN202321065742.3U patent/CN220634284U/en active Active
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