CN216573009U - Nylon synthesis system - Google Patents
Nylon synthesis system Download PDFInfo
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- CN216573009U CN216573009U CN202123154980.5U CN202123154980U CN216573009U CN 216573009 U CN216573009 U CN 216573009U CN 202123154980 U CN202123154980 U CN 202123154980U CN 216573009 U CN216573009 U CN 216573009U
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Abstract
The utility model provides a nylon synthesis system, including copolymerization reactor and water trap, copolymerization reactor includes the cauldron body, a heat exchanger, the flash column, first condenser, the lateral wall of the cauldron body is equipped with heat transfer jacket, heat transfer jacket's medium export is through the heat exchanger, the circulating pump links to each other with the medium import, the top of the cauldron body is equipped with the inlet tube, the exhaust pipe links to each other with the feed inlet of first condenser through the flash column, water trap includes rotatory adhesion promotion cauldron, it is first, the second three-way valve, the second condenser, the first port of first three-way valve links to each other with the steam exhaust mouth of rotatory adhesion promotion cauldron, the second port communicates with the second condenser, the first port of second three-way valve links to each other with the third port of first three-way valve, the second port links to each other with the negative pressure source, the third port links to each other with the protection air supply, cauldron body discharge port is connected with rotatory adhesion promotion cauldron feed inlet. The nylon powder material preparation device is simple in structure and convenient to operate, is used for directly preparing nylon powder material at a lower temperature to serve as a product for sale, and can effectively avoid the risk of material blockage.
Description
Technical Field
The utility model relates to the field of chemical industry, in particular to a nylon synthesis system.
Background
In the process of synthesizing nylon, a reaction kettle is used for copolymerization to generate a molten nylon material, the water content is about 5 percent, the temperature reaches above 300 ℃, and after further negative pressure dehydration is carried out by a rotary tackifying kettle, granular products are obtained by an underwater granulator and are sold externally. The nylon material obtained by the production process has high temperature, high subsequent treatment difficulty and high energy consumption, and the nylon material in a molten state is easy to block in the discharging process.
Therefore, how to design a nylon synthesis system with low energy consumption and avoiding material blockage is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a nylon synthesis system which is simple in structure and convenient to operate, is used for directly preparing nylon powder at a lower temperature to serve as a product for sale, and can effectively avoid the risk of material blockage.
The technical scheme of the utility model is as follows: a nylon synthesis system comprises a copolymerization reactor and a water removal device, wherein the copolymerization reactor comprises a kettle body, a heat exchanger, a flash tower and a first condenser, a heat exchange jacket is arranged on the side wall of the kettle body, a medium outlet of the heat exchange jacket is connected with a medium inlet of the heat exchange jacket through the heat exchanger and a circulating pump, a water inlet pipe and a steam exhaust pipe are arranged at the top of the kettle body, the upstream end of the water inlet pipe is used for being connected with a salt-free water source, a first valve is arranged on the water inlet pipe, the downstream end of the steam exhaust pipe is connected with a feed inlet of the first condenser through the flash tower, a second valve is arranged on the steam exhaust pipe, the water removal device comprises a rotary tackifying kettle, a first three-way valve, a second three-way valve and a second condenser, a first port of the first three-way valve is connected with a steam exhaust port of the rotary tackifying kettle, and a second port of the first three-way valve is communicated with a feed inlet of the second condenser, the first port of the second three-way valve is connected with the third port of the first three-way valve, the second port of the second three-way valve is connected with the negative pressure source, the third port of the second three-way valve is connected with the protective gas source, and the discharge port of the kettle body is detachably connected with the feed inlet of the rotary viscosity-increasing kettle to form a nylon synthesis system.
And a second port of the second three-way valve is connected with a negative pressure source through a third condenser.
The liquid discharge ports of the first condenser, the second condenser and the third condenser are connected with the reflux tank, and the exhaust ports of the first condenser, the second condenser and the third condenser are connected with the tail gas treatment system.
The circulating pump is connected with a medium inlet of the heat exchange jacket through a first port and a second port of the third three-way valve, and the heat exchanger is connected with a medium outlet of the heat exchange jacket through a first port and a second port of the fourth three-way valve.
And a check valve is arranged between the circulating pump and the third three-way valve.
And a third port of the third three-way valve is connected with a high-pressure air source, and a third port of the fourth three-way valve is connected with an oil inlet of the oil storage tank.
The high-pressure air source is a high-pressure nitrogen source, the oil storage tank is arranged above the fourth three-way valve, the oil inlet of the oil storage tank is provided with a third valve, and the top air port of the oil storage tank is provided with an oil-gas separation mechanism.
The protective gas source is a nitrogen source.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. the nylon synthesis system comprises a copolymerization reactor and a water removal device, wherein the copolymerization reactor is used for copolymerization to obtain a nylon solution, and the water removal device is used for removing water from the nylon solution to obtain a powdery nylon product. The copolymerization reactor comprises a kettle body, a heat exchanger, a flash tower and a first condenser, wherein the kettle body is used as a space for copolymerizing to obtain a nylon solution. The lateral wall of the kettle body is provided with a heat exchange jacket, heat exchange oil is introduced, the temperature of the materials in the kettle body is raised to reach the copolymerization temperature, and the temperature is uniformly raised. The medium outlet of the heat exchange jacket is connected with the medium inlet of the heat exchange jacket through the heat exchanger and the circulating pump, namely, the heat exchange oil circulates between the heat exchange jacket and the heat exchanger under the driving of the circulating pump, the heat exchange oil is heated or cooled through the heat exchanger, and the purpose of controlling the temperature of the materials in the kettle body is further realized. The top of the kettle body is provided with a water inlet pipe and a steam exhaust pipe, the upstream end of the water inlet pipe is used for being connected with a salt-free water source, a first valve is arranged on the water inlet pipe, the downstream end of the steam exhaust pipe is connected with a feed inlet of a first condenser through a flash tower, a second valve is arranged on the steam exhaust pipe, when the copolymerization product in the kettle body is cooled to a specified value, the first valve and the second valve are opened, the salt-free water is added into the kettle body through the water inlet pipe, the salt-free water is vaporized in the kettle body, the temperature of the copolymerization product is further reduced, the copolymerization product is diluted to obtain a nylon solution, a small amount of small-molecular nylon materials are stripped by a large amount of generated steam, the generated small-molecular nylon materials enter the flash tower through the steam exhaust pipe, the pressure is reduced, the air flow speed is reduced, part of mixed water vapor of the small-molecular nylon materials is intercepted in the flash tower, and the rest of mixed water vapor small-molecular nylon materials enter the first condenser, after the temperature is reduced, the water vapor and the micromolecule nylon material are retained in the first condenser in the form of solution, the nylon material which is subjected to secondary temperature reduction and dilution is discharged to a water removal device in the form of solution, the temperature is lower (120 plus 160 ℃) and the liquidity is strong. The dewatering device comprises a rotary viscosity-increasing kettle, a first three-way valve, a second three-way valve and a second condenser, wherein the rotary viscosity-increasing kettle is used for separating moisture in the nylon solution from nylon. The first port of the first three-way valve is connected with the steam outlet of the rotary tackifying kettle, the second port of the first three-way valve is communicated with the feed inlet of the second condenser, the water content of the nylon solution discharged to the rotary tackifying kettle is higher, the steam pressure in the rotary tackifying kettle is higher, the first three-way valve is controlled to ensure that the first port and the second port of the first three-way valve are communicated, the high-pressure steam in the rotary tackifying kettle strips the micromolecule nylon material and enters the second condenser, the micromolecule nylon material in the micromolecule nylon material is converted into liquid when cooled and is intercepted in the second condenser, the noncondensable gas in the micromolecule nylon material carries a small amount of micromolecule nylon material and is discharged from the exhaust port of the second condenser, in the stage, the air in the rotary tackifying kettle is in a positive pressure state, the contact between the nylon solution and oxygen is less, the reduction of the quality of the nylon material caused by oxidation is avoided, and part of water can be separated from the nylon material without extra energy consumption, and the energy consumption can be effectively reduced. The first port of the second three-way valve is connected with the third port of the first three-way valve, the second port of the second three-way valve is connected with a negative pressure source, the third port of the second three-way valve is connected with a protective gas source, when the pressure in the rotary tackifying kettle is smaller, the nylon material in the kettle is heated (lower than the melting point of nylon) through the rotary tackifying kettle, the first three-way valve and the second three-way valve are controlled to ensure that the first port and the third port of the first three-way valve are communicated and the first port and the second port of the second three-way valve are communicated, the rotary tackifying kettle is vacuumized by using the negative pressure source, the moisture in the nylon solution in the rotary tackifying kettle is forced to be further distilled and separated from the nylon material, the second three-way valve is controlled at intervals to ensure that the first port and the third port of the second three-way valve are communicated, nitrogen is supplemented into the rotary tackifying kettle, the oxygen content is reduced, and the quality reduction caused by oxidation of the nylon material is reduced, until the water content of the nylon material in the rotary tackifying kettle is reduced to meet the relevant standard, the nylon powder can be directly obtained and can be sold as a product.
2. The second port of the second three-way valve is connected with the negative pressure source through the third condenser, so that water vapor is prevented from entering the negative pressure source, and the negative pressure source is prevented from being damaged on the basis of intercepting and recovering small molecular nylon materials and moisture in the negative pressure source.
3. The liquid discharge ports of the first condenser, the second condenser and the third condenser are connected with the reflux tank, the exhaust ports of the first condenser, the second condenser and the third condenser are connected with the tail gas treatment system, the intercepted distilled water containing the micromolecule nylon material is recycled, and the direct discharge to the outside to cause the environmental pollution is avoided.
4. The circulating pump is connected with a medium inlet of the heat exchange jacket through a first port and a second port of a third three-way valve, the heat exchanger is connected with a medium outlet of the heat exchange jacket through a first port and a second port of a fourth three-way valve, a third port of the third three-way valve is connected with a high-pressure air source, a third port of the fourth three-way valve is connected with an oil inlet of the oil storage tank, when the copolymerization of materials in the kettle is completed and the temperature of a copolymerization product in the kettle needs to be reduced, the second port and the third port of the third three-way valve are controlled to be communicated, the second port and the third port of the fourth three-way valve are communicated, the high-pressure air source is started, the heat exchange oil in the heat exchange jacket is forcibly emptied into the oil storage tank, the purpose of rapidly reducing the temperature of the copolymerization product in the kettle is achieved, and the emptied heat exchange oil can be returned to the heat exchange jacket of the kettle for reuse.
The following description is further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of the connection of the present invention.
In the attached drawing, 1 is a copolymerization reactor, 2 is a water removal device, 3 is a kettle body, 4 is a heat exchanger, 5 is a flash tower, 6 is a first condenser, 7 is a heat exchange jacket, 9 is a circulating pump, 10 is a water inlet pipe, 11 is a steam exhaust pipe, 12 is a rotary viscosity increasing kettle, 13 is a first three-way valve, 14 is a second three-way valve, 15 is a second condenser, 16 is a third condenser, 17 is a reflux tank, 18 is a third three-way valve, 19 is a fourth three-way valve, 20 is an oil storage tank, a is a first valve, b is a second valve, c is a check valve, and d is a third valve.
Detailed Description
In the utility model, the equipment or the component which is not marked with a specific structure or model is generally the conventional equipment or the component in the chemical field, and the equipment or the component which is not marked with a specific connection mode is generally the conventional connection mode in the chemical field or the connection mode suggested by manufacturers.
Referring to fig. 1, a specific embodiment of a nylon synthesis system is shown. The nylon synthesis system comprises a copolymerization reactor 1 and a water removal device 2. The copolymerization reactor 1 comprises a kettle body 3, a heat exchanger 4, a flash tower 5 and a first condenser 6, wherein the heat exchanger adopts a tube type heat exchanger. The lateral wall of the kettle body 3 is provided with a heat exchange jacket 7, a medium outlet of the heat exchange jacket 7 is connected with a medium inlet of the heat exchange jacket 7 through a heat exchanger 4 and a circulating pump 9, in this embodiment, the medium outlet is arranged at the top of the heat exchange jacket, the medium inlet is arranged at the bottom of the heat exchange jacket, the circulating pump 9 is connected with the medium inlet of the heat exchange jacket 7 through a first port and a second port of a third three-way valve 18, and a check valve c is arranged between the circulating pump 9 and the third three-way valve 18. The heat exchanger 4 is connected with a medium outlet of the heat exchange jacket 7 through a first port and a second port of a fourth three-way valve 19, in this embodiment, a third port of the fourth three-way valve 19 is connected with an oil inlet of an oil storage tank 20, specifically, the oil storage tank 20 is arranged above the fourth three-way valve 19, the oil inlet of the oil storage tank 20 is provided with a third valve d, and an oil-gas separation mechanism is arranged at a top gas port of the oil storage tank 20. The top of the kettle body 3 is provided with a water inlet pipe 10 and a steam exhaust pipe 11. The upstream end of the water inlet pipe 10 is used for being connected with a salt-free water source, and a first valve a is arranged on the water inlet pipe 10. The downstream end of exhaust pipe 11 links to each other with the feed inlet of first condenser 6 through flash column 5, sets up second valve b on the exhaust pipe 11, and in this embodiment, the tower bottom of flash column links to each other with recovery tank 17 through the pipeline, and sets up the valve on this pipeline, and the leakage fluid dram of first condenser passes through the pipeline and links to each other with return tank 17, and sets up the valve on this pipeline, and the gas vent of first condenser links to each other with tail gas treatment system. The water removal device 2 comprises a rotary tackifying kettle 12, a first three-way valve 13, a second three-way valve 14 and a second condenser 15. The first port of the first three-way valve 13 is connected with the steam outlet of the rotary viscosity increasing kettle 12, the second port of the first three-way valve 13 is communicated with the feed inlet of the second condenser 15, specifically, the liquid discharge port of the second condenser 15 is connected with the recovery tank 17 through a pipeline, a valve is arranged on the pipeline, and the exhaust port of the second condenser 15 is connected with a tail gas treatment system. The first port of the second three-way valve 14 is connected with the third port of the first three-way valve 13, the second port of the second three-way valve 14 is connected with a negative pressure source, in this embodiment, the negative pressure source adopts a vacuum pump, a third condenser 16 is arranged between the second three-way valve and the vacuum pump, the liquid discharge port of the third condenser is connected with the recovery tank through a pipeline, and a valve is arranged on the pipeline. The third port of the second three-way valve 14 is connected to a protection gas source, specifically, the protection gas source is a nitrogen gas source, and a nitrogen gas tank can be directly used to provide nitrogen gas with pressure. The discharge outlet of the kettle body 3 is detachably connected with the feed inlet of the rotary viscosity-increasing kettle 12 to form a nylon synthesis system.
The working principle of the utility model is that the nylon salt solution obtained in the salt forming kettle is added into the kettle body, and the heat exchange oil in the heat exchange jacket is utilized to heat the nylon salt solution until the copolymerization is finished to obtain the nylon material, the temperature is about 250 ℃, the heat exchanger can be utilized to cool the heat exchange oil to achieve the purpose of reducing the temperature of the nylon material in the kettle, or the second port and the third port of the third three-way valve are controlled to be communicated, the second port and the third port of the fourth three-way valve are communicated, the high-pressure gas source is started, the heat exchange oil in the heat exchange jacket is forcibly emptied into the oil storage tank, the purpose of rapidly cooling the copolymerization product in the kettle body is realized, and the emptied heat exchange oil can be returned to the heat exchange jacket of the kettle body for reuse. After the temperature of the copolymerization product in the kettle body is reduced to a designated value (about 180 ℃), the first valve and the second valve are opened, the salt-free water (with the temperature of 110-, and the copolymerization product is diluted to obtain nylon solution, a large amount of generated steam strips a small amount of micromolecule nylon material, the nylon material enters a flash tower through a steam exhaust pipe, the pressure is reduced, and the air flow speed is reduced, part of the small molecular nylon material mixed part of the water vapor is trapped in the flash tower, the rest of the water vapor mixed with the micromolecular nylon material enters a first condenser, after the temperature is reduced, the water vapor and the micromolecular nylon material are retained in the first condenser in the form of solution, and opening valves corresponding to the flash tower and the first condenser, and collecting the intercepted nylon material aqueous solution to a recovery tank for recycling. Discharging the nylon material (about 120 ℃ and about 70% of water content) which is subjected to secondary cooling and dilution to a water removal device in the form of solution, evaporating a large amount of water in a rotary tackifying kettle, controlling the communication of a first port and a second port of a first three-way valve, allowing the stripped small-molecule nylon material to enter a second condenser, allowing the small-molecule nylon material to be converted into liquid when the small-molecule nylon material is cooled, intercepting the liquid in the second condenser, allowing non-condensable gas carrying a small amount of small-molecule nylon material to be discharged from an exhaust port of the second condenser, treating the gas by a tail gas treatment system, then discharging the gas, opening a corresponding valve, collecting the liquid nylon material aqueous solution to a recovery tank, heating the nylon material in the kettle (lower than the melting point of nylon) by the rotary tackifying kettle after the pressure in the rotary tackifying kettle is lower, and controlling a first three-way valve and a second three-way valve to enable the first port and the third port of the first three-way valve to be communicated, The first port and the second port of second three-way valve communicate, utilize the negative pressure source to the rotatory tackifying cauldron evacuation, force the moisture in the nylon solution in the rotatory tackifying cauldron to further distill and nylon materials separation, and interval control second three-way valve, make the first port and the third port of second three-way valve communicate, supply nitrogen gas in the rotatory tackifying cauldron, reduce oxygen content, reduce the nylon materials and cause the quality to descend because of the oxidation, the water content of nylon materials descends to satisfying relevant standard in the rotatory tackifying cauldron, can directly obtain the nylon powder, can outwards sell as the product.
Claims (8)
1. A nylon synthesis system, characterized in that: comprises a copolymerization reactor (1) and a water removal device (2),
the copolymerization reactor (1) comprises a kettle body (3), a heat exchanger (4), a flash tower (5) and a first condenser (6),
a heat exchange jacket (7) is arranged on the side wall of the kettle body (3), a medium outlet of the heat exchange jacket (7) is connected with a medium inlet of the heat exchange jacket (7) through a heat exchanger (4) and a circulating pump (9),
the top of the kettle body (3) is provided with a water inlet pipe (10) and a steam exhaust pipe (11),
the upstream end of the water inlet pipe (10) is used for being connected with a salt-free water source, a first valve (a) is arranged on the water inlet pipe (10),
the downstream end of the steam exhaust pipe (11) is connected with the feed inlet of the first condenser (6) through the flash tower (5), the steam exhaust pipe (11) is provided with a second valve (b),
the water removal device (2) comprises a rotary tackifying kettle (12), a first three-way valve (13), a second three-way valve (14) and a second condenser (15),
a first port of the first three-way valve (13) is connected with a steam outlet of the rotary tackifying kettle (12), a second port of the first three-way valve (13) is communicated with a feed inlet of a second condenser (15),
a first port of the second three-way valve (14) is connected with a third port of the first three-way valve (13), a second port of the second three-way valve (14) is connected with a negative pressure source, a third port of the second three-way valve (14) is connected with a protective gas source,
the discharge outlet of the kettle body (3) is detachably connected with the feed inlet of the rotary viscosity-increasing kettle (12) to form a nylon synthesis system.
2. The nylon synthesis system of claim 1, wherein: and a second port of the second three-way valve (14) is connected with a negative pressure source through a third condenser (16).
3. The nylon synthesis system of claim 2, wherein: the liquid discharge ports of the first condenser (6), the second condenser (15) and the third condenser (16) are connected with the reflux tank (17), and the exhaust ports of the first condenser (6), the second condenser (15) and the third condenser (16) are connected with a tail gas treatment system.
4. The nylon synthesis system of claim 1, wherein: the circulating pump (9) is connected with a medium inlet of the heat exchange jacket (7) through a first port and a second port of a third three-way valve (18), and the heat exchanger (4) is connected with a medium outlet of the heat exchange jacket (7) through a first port and a second port of a fourth three-way valve (19).
5. The nylon synthesis system of claim 4, wherein: a check valve (c) is arranged between the circulating pump (9) and the third three-way valve (18).
6. The nylon synthesis system of claim 4, wherein: and a third port of the third three-way valve (18) is connected with a high-pressure air source, and a third port of the fourth three-way valve (19) is connected with an oil inlet of an oil storage tank (20).
7. The nylon synthesis system of claim 6, wherein: the high-pressure air source is a high-pressure nitrogen source, the oil storage tank (20) is arranged above the fourth three-way valve (19), the oil inlet of the oil storage tank (20) is provided with a third valve (d), and the top air port of the oil storage tank (20) is provided with an oil-gas separation mechanism.
8. The nylon synthesis system of claim 1, wherein: the protective gas source is a nitrogen source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123154980.5U CN216573009U (en) | 2021-12-14 | 2021-12-14 | Nylon synthesis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123154980.5U CN216573009U (en) | 2021-12-14 | 2021-12-14 | Nylon synthesis system |
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| Publication Number | Publication Date |
|---|---|
| CN216573009U true CN216573009U (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123154980.5U Active CN216573009U (en) | 2021-12-14 | 2021-12-14 | Nylon synthesis system |
Country Status (1)
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| CN (1) | CN216573009U (en) |
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2021
- 2021-12-14 CN CN202123154980.5U patent/CN216573009U/en active Active
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