CN220940597U - Pressurizing feeding system for continuous production of copolymerized nylon - Google Patents
Pressurizing feeding system for continuous production of copolymerized nylon Download PDFInfo
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- CN220940597U CN220940597U CN202322432483.XU CN202322432483U CN220940597U CN 220940597 U CN220940597 U CN 220940597U CN 202322432483 U CN202322432483 U CN 202322432483U CN 220940597 U CN220940597 U CN 220940597U
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- China
- Prior art keywords
- caprolactam
- pump
- salt solution
- supply system
- continuous production
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- 239000004677 Nylon Substances 0.000 title claims abstract description 15
- 229920001778 nylon Polymers 0.000 title claims abstract description 15
- 238000010924 continuous production Methods 0.000 title claims abstract description 12
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000012266 salt solution Substances 0.000 claims abstract description 40
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 4
- 238000007334 copolymerization reaction Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 244000309464 bull Species 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Polyamides (AREA)
Abstract
The utility model discloses a pressurized feeding system for continuous production of copolymerized nylon, which comprises a salt solution supply system and a caprolactam supply system; the method is characterized in that: the salt solution supply system sequentially comprises a salt solution storage tank, a salt solution supply pump, a filter, a salt solution concentration tank and a salt solution pressurizing pump set; the caprolactam supply system sequentially comprises a caprolactam storage tank, a caprolactam supply pump, a filter, a caprolactam buffer tank and a caprolactam booster pump; through centrifugal pump and bull diaphragm pump combination design, changed traditional single centrifugal pump conveying mode, satisfied the transportation of material after improving, also satisfied copolymerization system's copolymerization requirement 0.6 ~ 2.0MPa simultaneously, guaranteed that copolymerization unit can continuous reaction, improved the stability of product production.
Description
Technical Field
The utility model belongs to the technical field of copolymerized nylon production, and particularly relates to a pressurizing feeding system for continuous production of copolymerized nylon.
Background
The working pressure range of the reactor required by the reaction of the PA66 salt and the caprolactam is 0.6-2.0 MPa, so that high-pressure metering and conveying equipment is required for conveying the caprolactam solution and the PA66 or PA56 solution into the reactor, and the metering and conveying equipment commonly adopted in the nylon industry cannot meet the requirement of high-pressure continuous conveying, so that a continuous conveying system for a copolymerization system needs to be designed.
The application designs a pressurizing feeding system for continuous production of copolymerized nylon.
Disclosure of utility model
Aiming at the problems in the prior art, the utility model provides a pressurizing feeding system for continuous production of copolymerized nylon, which is stable in production.
The utility model is realized in such a way that a pressurized feeding system for continuous production of copolymerized nylon comprises a salt solution supply system and a caprolactam supply system; the method is characterized in that: the salt solution supply system sequentially comprises a salt solution storage tank, a salt solution supply pump, a filter, a salt solution concentration tank and a salt solution pressurizing pump set; the caprolactam supply system sequentially comprises a caprolactam storage tank, a caprolactam supply pump, a filter, a caprolactam buffer tank and a caprolactam booster pump;
Preferably, the saline solution booster pump unit and the caprolactam booster pump unit comprise a centrifugal pump and a group of multi-head diaphragm pumps, wherein the centrifugal pump is used for stable feeding, and raw materials are fully filled in a conveying pipeline in front of the multi-head diaphragm pumps.
Preferably, the supply pressure of the salt solution booster pump group and the caprolactam booster pump group is 0.6-2.0 MPa.
Preferably, ball valves are arranged on the inlet and outlet pipelines of the multi-head diaphragm pump, two hoses are connected through a quick connector, the inlet pipeline hose of the multi-head diaphragm pump is connected with desalted water, and the outlet hose is placed in the water tank.
The utility model has the advantages and technical effects that: according to the utility model, through the design of the centrifugal pump and the multi-head diaphragm pump, the traditional single centrifugal pump conveying mode is changed, the condition of high-pressure conveying of materials is met after improvement, meanwhile, the pressure requirement of a polymerization kettle of a copolymerization system is 0.6-2.0 MPa, the stability of product production and conveying is improved, and continuous reaction of a copolymerization unit is ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a graph of pump discharge line pulsations in a single pump;
FIG. 3 is a graph of pump discharge line pulsations in a duplex pump;
fig. 4 is a graph of pump discharge pulsation for a triple pump.
In the figure, 1, a raw material supply unit; 110. a saline solution supply system; 111. a salt solution storage tank; 112. a saline solution supply pump; 113. a filter; 114. a salt solution concentration tank; 115. a salt solution pressurizing pump group; 120. a caprolactam supply system; 121. a caprolactam storage tank; 122. caprolactam supply pump; 123. a filter; 124. caprolactam buffer tank; 125. a caprolactam booster pump set; 130. a centrifugal pump; 140. a multi-head diaphragm pump; 141. a ball valve; 142. a hose; 2. and a hybrid heating unit.
Detailed Description
The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1, a pressurized feeding system for continuous production of copolymerized nylon is connected to a mixing heating unit 2, and includes a salt solution supply system 110 and a caprolactam supply system 120; wherein, the saline solution supplying system comprises a saline solution storage tank 111, a saline solution supplying pump 112, a filter 113, a saline solution concentrating tank 114 and a saline solution pressurizing pump set 115 in sequence; the medium salt solution storage tank is used for storing salt solution; the salt solution supply pump provides power for salt solution transportation, and the filter filters impurities and crystals of the salt solution; for example, nylon PA66 salt is delivered to the plant as a 50% strength aqueous solution in tank trucks and stored in salt solution storage tanks after unloading. The salt solution is concentrated to a process concentration using a salt solution feed pump to a salt solution concentration tank. The concentration tank uses steam as a heat source, the salt solution concentration tank uses a steam jacket for heat preservation and a coil for heating, the steam pressure is adjusted to control the salt solution temperature, and the condensing device controls the pressure of the concentration tank. The concentration of the salt solution is constant by controlling certain temperature and pressure, the concentration can be increased to 60-70% as required, and the temperature of the PA66 after concentration is 150-170 ℃; the concentrated salt solution enters a reactor to reduce energy consumption, and the concentration of the salt solution is controlled to be stable so as to avoid the influence of excessive salt precipitation and concentration fluctuation on the polymerization reaction; the salt solution is controlled to reach stable concentration by controlling specific temperature and pressure; the concentrated salt solution is pressurized by a metering pump and then is sent out to be mixed with caprolactam.
Caprolactam supply system 120 comprises, in order, caprolactam storage tank 121, caprolactam supply pump 122, filter 123, caprolactam buffer tank 124, and caprolactam booster pump 125; the caprolactam storage tank is used for storing caprolactam, the caprolactam supply pump is used for providing power for conveying the caprolactam, the caprolactam buffer tank is used for buffering conveying pressure, and then the caprolactam is ensured to be conveyed to the next stage in a range meeting the later copolymerization pressure through the increase of the booster pump group.
Preferably, the saline solution booster pump unit and the caprolactam booster pump unit comprise a centrifugal pump 130 and a group of multi-head diaphragm pumps 140, wherein the centrifugal pump is used for stable feeding, and the raw materials are fully filled in a conveying pipeline in front of the multi-head diaphragm pumps; the single diaphragm pump has the function of metering and conveying, but can not ensure that materials stably enter the copolymerization system, so that the multi-head diaphragm pump is adopted for parallel metal conveying, and the multi-head diaphragm pump is overlapped, so that the conveying of the materials is met, and meanwhile, the copolymerization requirement of the copolymerization system is 0.6-2.0 MPa; by adopting the technical scheme, the problem that the conventional system can not stably feed materials only by adopting a centrifugal pump is solved, and meanwhile, the secondary supercharging equipment is required to be used. In the actual research and development process, the single centrifugal pump, the double centrifugal pumps, the single centrifugal pump and the multi-head diaphragm pump are compared, and the single centrifugal pump and the multi-head diaphragm pump are combined and then are conveyed to the next stage within the range of meeting the later copolymerization pressure through the test, and particularly, please refer to fig. 2-4.
The ball valve 141 is arranged on the inlet and outlet pipelines of the multi-head diaphragm pump, two hoses 142 are connected through a quick connector, the inlet pipeline hose of the multi-head diaphragm pump is connected with desalted water, the outlet hose is placed in a water tank, and the multi-head diaphragm pump is started to enable the desalted water to enter the front pipeline and the rear pipeline of the diaphragm pump for flushing.
In combination, the utility model changes the traditional single centrifugal pump conveying mode, satisfies the conveying of materials after improvement, and simultaneously satisfies the copolymerization requirement of 0.6-2.0 MPa of a copolymerization system, ensures that a copolymerization unit can continuously react, and improves the stability of product production.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (4)
1. A pressurized feeding system for continuous production of copolymerized nylon comprises a salt solution supply system and a caprolactam supply system; the method is characterized in that: the salt solution supply system sequentially comprises a salt solution storage tank, a salt solution supply pump, a filter, a salt solution concentration tank and a salt solution pressurizing pump set; the caprolactam supply system sequentially comprises a caprolactam storage tank, a caprolactam supply pump, a filter, a caprolactam buffer tank and a caprolactam booster pump.
2. The pressurized feed system for continuous production of copolymerized nylon according to claim 1, wherein: the saline solution booster pump unit and the caprolactam booster pump unit both comprise a centrifugal pump and a group of multi-head diaphragm pumps, wherein the centrifugal pump is used for stable feeding, and raw materials are fully filled in a conveying pipeline in front of the multi-head diaphragm pumps.
3. The pressurized feed system for continuous production of copolymerized nylon according to claim 1, wherein: the supply pressure of the salt solution booster pump group and the caprolactam booster pump group is 0.6-2.0 MPa.
4. The pressurized feed system for continuous production of copolymerized nylon according to claim 2, wherein: ball valves are arranged on the inlet and outlet pipelines of the multi-head diaphragm pump, two hoses are connected through a quick connector, the inlet pipeline hose of the multi-head diaphragm pump is connected with desalted water, and the outlet hose is placed in the water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322432483.XU CN220940597U (en) | 2023-09-07 | 2023-09-07 | Pressurizing feeding system for continuous production of copolymerized nylon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322432483.XU CN220940597U (en) | 2023-09-07 | 2023-09-07 | Pressurizing feeding system for continuous production of copolymerized nylon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220940597U true CN220940597U (en) | 2024-05-14 |
Family
ID=91025104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322432483.XU Active CN220940597U (en) | 2023-09-07 | 2023-09-07 | Pressurizing feeding system for continuous production of copolymerized nylon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220940597U (en) |
-
2023
- 2023-09-07 CN CN202322432483.XU patent/CN220940597U/en active Active
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