CN113461937B - Fine devolatilization device for nylon 6 melt - Google Patents
Fine devolatilization device for nylon 6 melt Download PDFInfo
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- CN113461937B CN113461937B CN202110726709.XA CN202110726709A CN113461937B CN 113461937 B CN113461937 B CN 113461937B CN 202110726709 A CN202110726709 A CN 202110726709A CN 113461937 B CN113461937 B CN 113461937B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/46—Post-polymerisation treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
Abstract
The invention relates to the field of nylon production equipment, and discloses a nylon 6 melt fine devolatilization device, which comprises the following components: a housing; an upper sealing plate which is covered at the opening of the top of the shell; a melt feed tube disposed on the upper seal plate; the devolatilization distribution plate is arranged in the shell and divides the shell into an upper part and a lower part of a melt distribution cavity and a vacuum devolatilization cavity; a plurality of devolatilization holes are distributed on the devolatilization distribution plate; a vacuum pumping mechanism; a heating mechanism; and a melt outlet arranged at the bottom of the shell. The device can meet the devolatilization characteristic of nylon 6 melt, and has the characteristics of uniform material distribution and heat transfer, uniform and stable reaction, high efficiency, high production stability, low energy consumption and the like.
Description
Technical Field
The invention relates to the field of nylon production equipment, in particular to a nylon 6 melt fine devolatilization device.
Background
The conversion of caprolactam by hydrolytic polymerization is generally around 90%, meaning that about 10% of caprolactam monomer and oligomers (also called hot water extractables, wherein about 75% of monomer and about 25% of oligomer) remain in the polymer, and impurities in these melts have a great influence on spinning. Therefore, before spinning the PA6, the slices need to be subjected to an extraction treatment, and the hot water extractables content of the PA6 slices should be less than 0.5wt% (superior) according to FZ/T51004-2011. At present, a hot water continuous extraction process is commonly adopted in industry to extract monomers and oligomers in the PA6 slice, so that the content of extractables in the slice is lower than 0.5wt% and the requirement of high-speed spinning is met. However, a large amount of water and energy are consumed in the extraction, drying and remelting processes, and according to statistics, the energy consumption in the extraction and drying processes accounts for 15-20% of the energy consumption in the PA6 slice production process, so that the production cost of the PA6 fiber is greatly increased. In order to eliminate the defects, the PA6 spinning technology is pushed to the direct spinning direction in the future, and compared with the spinning by a slicing method, the melt direct spinning can greatly simplify the production flow, has low capital investment in unit yield and is beneficial to further reducing the production cost of the fiber.
The main method for reducing the hot water extractables content in the caprolactam hydrolysis polymerization process is to control the polymerization temperature, because caprolactam polymerization is an equilibrium relation which changes along with the change of temperature, hot water extractables, especially cyclic oligomers, are more favorable to be generated along with the increase of temperature, and therefore, the hot water extractables content, namely low-temperature polymerization, can be effectively controlled by controlling the polymerization temperature. In order to ensure that the polymerization process is carried out in a liquid state, the polymerization temperature is at least 10 ℃ below the melting point of nylon 6, the hot water extractables cannot be controlled in a melt direct spinning range at the same time, and the low-temperature polymerization has the further disadvantage that the reaction speed is low, and the molecular weight of the obtained polymer is low; the spinning of fibers from low temperature polymers requires that the polymer be first brought to processing temperature, however, there is little advantage to the normal polymerization process due to the chemical equilibrium of the reaction and the formation of low molecular weight compounds, and therefore additional processes are required to reduce the hot water extractables content in the melt.
The applicant has found in the previous studies that under certain devolatilization conditions, the monomers in the nylon 6 melt can be effectively removed, and in the process, the removal of the monomers can also drive other oligomers, especially cyclic dimers, to sublimate, and the monomers are removed from the melt, so that a way for reducing the hot water extractables content in the nylon 6 melt is provided. Therefore, by developing a devolatilization device special for nylon 6, the content of hot water extractables in nylon 6 melt is reduced, and meanwhile, the aim of high-efficiency recycling of the hot water extractables is fulfilled, so that the method becomes a trend of nylon 6 industry development.
Disclosure of Invention
In order to solve the technical problems, the invention provides a nylon 6 melt fine devolatilization device. The device can meet the devolatilization characteristic of nylon 6 melt, and has the characteristics of uniform material distribution and heat transfer, uniform and stable reaction, high efficiency, high production stability, low energy consumption and the like.
The specific technical scheme of the invention is as follows: a nylon 6 melt fine devolatilization device comprising:
a housing;
an upper sealing plate which is covered at the opening of the top of the shell;
a melt feed tube disposed on the upper seal plate;
the devolatilization distribution plate is arranged in the shell and divides the shell into an upper part and a lower part of a melt distribution cavity and a vacuum devolatilization cavity; a plurality of devolatilization holes are distributed on the devolatilization distribution plate;
the vacuumizing mechanism is positioned below the devolatilization distribution plate;
a heating mechanism for providing heat to the inner cavity of the shell;
and a melt outlet arranged at the bottom of the shell.
The working principle of the fine devolatilization device of the invention is as follows: before spinning, nylon 6 melt enters a melt distribution cavity in a shell from a melt feeding pipe through a booster pump, and the melt uniformly flows into the surface of a devolatilization distribution plate, and under the heating condition, the melt is sprayed or extruded to form a trickle in the process of passing through a devolatilization hole and enters a vacuum devolatilization cavity due to the fact that the pressure of the melt distribution cavity is large. The devolatilization area of the melt is obviously increased in the process, and the monomer and oligomer of the gas are separated from the melt in a heating vacuum state and gathered at the top of the vacuum devolatilization cavity and pumped out by the vacuumizing mechanism. And finally discharging the devolatilized nylon melt from a melt outlet. After the fine devolatilization treatment, the content of the hot water extractables in the nylon melt can be reduced from about 3% to less than 1.5% by weight, and the content of the cyclic dimer is reduced to less than 0.3% by weight. The structure of the device can realize the devolatilization process of nylon 6, realize uniform heating and distribution of materials, and control the reaction temperature within a reasonable small range, thereby achieving the devolatilization effect.
In combination, after the melt passes through the fine devolatilization device, the devolatilization process of nylon 6 can be realized, the materials are heated uniformly and distributed uniformly, and the reaction temperature difference is controlled within a reasonable range, so that the stable and efficient devolatilization effect is achieved.
Compared with the traditional disc devolatilizer and the thin film evaporator, the device has less contact with the PA6 melt in the devolatilizing process, avoids the problem that gel is formed by sticking the wall of the high-viscosity melt to influence the quality of the melt, prolongs the maintenance period of equipment and reduces the maintenance cost of the equipment.
Preferably, the axial cross section of the devolatilization hole is in a shape with a large upper part and a small lower part.
Preferably, the upper part of the devolatilization hole is hemispherical, and the lower part is vertical tubular.
The design of the devolatilization hole shape can ensure the stability of melt flow to the greatest extent.
Preferably, the devolatilization plate has a thickness of 10-25mm. The diameter of the guide hole at the upper part of the devolatilization hole is 0.1-5mm, and the diameter of the capillary hole at the lower part is 1/4-1/2 of that at the upper part. The diameter of the upper part of the devolatilization hole is limited to be in the range of 0.1-5mm, and the diameter of the hole can be regulated according to the melt viscosity in actual production.
Preferably, the bottom outlet of the melt feeding pipe is provided with a plurality of distribution branch pipes which uniformly face the devolatilization plate.
The design can ensure that the melt can uniformly flow into the vacuum devolatilization chamber through the devolatilization plate.
Preferably, the devolatilization distribution plate is divided into an outer edge non-hole distribution area, an annular hole distribution area and an inner edge non-hole distribution area; the devolatilization holes are uniformly distributed in the annular hole distribution area, and the annular hole distribution area is lower than the outer edge non-hole distribution area and the inner edge non-hole distribution area.
Preferably, the vacuumizing mechanism comprises an annular air pipe, an air outlet pipe and a vacuumizing pump, wherein the annular air pipe and the air outlet pipe are horizontally arranged below the devolatilization distribution plate, and the vacuumizing pump is arranged outside the shell; the annular air pipe is communicated with the vacuumizing pump through an air outlet pipe; the annular air pipe is uniformly distributed with air holes.
The device considers that the flow of gas can influence the thin-flow melt when vacuumizing, for example, the single flow flowing out of each devolatilization hole is easily intersected under the influence of the air flow, so that the thin flow is disturbed or even broken, the devolatilization area is large in fluctuation, and the devolatilization effect is unstable. The positions of the annular hole distribution areas of the devolatilization distribution plate are designed to be lower than the outer edge non-hole distribution areas and the inner edge non-hole distribution areas, and annular air pipes are arranged around the annular hole distribution areas to vacuumize, so that the air flowing process can be dispersed, the air is not directly opposite to the melt direction, and the interference of the flowing air on the trickle melt in the devolatilization process can be avoided to the greatest extent.
Preferably, the devolatilization holes are arranged in 2-3 circles in the radial direction of the annular hole distribution area.
Preferably, a semi-open baffle is arranged at the air hole of the annular air pipe.
In order to further avoid the disturbance of vacuum pumping to the thin flow of the melt and prevent the blockage of the melt caused by the fact that the melt is pumped into the air hole, the device is provided with a semi-open baffle at the air hole, and the occurrence of the situations can be avoided to the greatest extent.
Preferably, the number of the gas outlet pipes is a plurality, and the gas outlet pipes are equidistantly distributed on the circumference of the annular gas pipe.
Preferably, the vacuum pump is one or a combination of multiple stages of rotary vane vacuum pump, molecular vacuum pump, jet vacuum pump, diffusion pump and diffusion jet pump in series.
Preferably, the diameter of the annular air pipe is larger than that of the annular hole distribution area.
The design can ensure that the annular air pipe is positioned around the annular hole distribution area during vacuumizing, and can rapidly and directly suck devolatilizing gas separated from the melt.
Preferably, the heating mechanism comprises a heating medium jacket wrapped on the outer side wall of the shell and a heating medium heating pipe vertically arranged in the center of the inner cavity of the shell.
If the heat medium jacket is only arranged outside the shell, the heat transfer effect of the substances can be weakened in a vacuum state, the temperature of the innermost side and the temperature of the outermost side in the shell have a remarkable temperature difference, and the melt close to the shell has a higher reaction temperature than the melt in the center, so that the uniformity of the melt is poor. Therefore, the heating mechanism of the device consists of two parts, wherein one part of the heating mechanism is arranged outside the shell and used for carrying out sectional heating, and the other part of the heating mechanism is provided with a heating medium heating pipe from the inside of the shell to ensure that the temperature inside the shell is uniform; the design ensures that the temperature distribution in the whole shell is uniform, and the devolatilization effect is obvious.
Preferably, the heating medium jacket is provided with a heating medium inlet and a heating medium outlet; the heating medium inlet of the heating medium heating pipe is arranged on the outer wall of the bottom of the shell, and the heating medium outlet is fixed on the upper sealing plate and extends to the outside.
Preferably, a wall scraping mechanism is arranged at the bottom of the inner cavity of the shell; the wall scraping mechanism comprises a spiral belt scraper, a scraper driving shaft and an external driver, wherein the spiral belt scraper is clung to the inner wall of the shell, and the scraper driving shaft is linked with the spiral belt scraper.
The nylon melt flows into the bottom of the shell after devolatilization and is easily deposited on the inner wall. The wall scraping mechanism can effectively avoid the wall sticking phenomenon.
Preferably, the inner wall of the shell and the surface of the spiral band scraper are provided with non-stick coatings.
The components can avoid adhesion and accumulation of sticky materials on the surfaces of the components after non-sticky treatment.
Preferably, the shell is divided into an upper part and a lower part, and the upper part and the lower part are connected through flanges.
Compared with the prior art, the invention has the beneficial effects that:
(1) The device can meet the devolatilization characteristic of nylon 6, and has the characteristics of uniform material distribution and heat transfer, uniform and stable reaction, high efficiency, high production stability, low energy consumption and the like. The hot water extractables content in the nylon 6 melt can be less than 1.5wt percent, and the cyclic dimer content is less than 0.3wt percent.
(2) The devolatilization effect is unstable when the influence of the flow of gas on the fine-flow melt is considered during the vacuum pumping. The device designs the positions of the annular hole distribution areas of the devolatilization distribution plate to be lower than the outer edge non-hole distribution areas and the inner edge non-hole distribution areas, and simultaneously, annular air pipes are arranged around the annular hole distribution areas, and semi-open baffles are arranged at air holes of the annular air pipes. The flow process of the dispersible gas can lead the gas not to directly face the direction of the melt, and can avoid the interference of the flow of the gas in the devolatilization process of the trickle melt to the greatest extent.
(3) The axial section of the devolatilization hole of the device is in a shape with big top and small bottom. The design of the devolatilization hole shape can ensure the stability of melt flow to the greatest extent.
(4) The device is designed with the double channels of the internal heating medium and the external heating medium, ensures the heat supply quantity, avoids the great fluctuation of the temperature of the melt caused in the volatilization removal process, and ensures that the material is heated uniformly and the uniformity of each trickle is ensured.
(5) Compared with the traditional disc reactor and the thin film evaporator, the device has less contact with the PA6 melt in the devolatilization process, avoids the problem that gel formed by sticking the wall of the high-viscosity melt influences the quality of the melt, prolongs the maintenance period of equipment and reduces the maintenance cost of the equipment.
Drawings
FIG. 1 is a front cross-sectional view of the device of example 1 of the present invention;
FIG. 2 is a side cross-sectional view of the device of example 1 of the present invention;
FIG. 3 is a top view of the upper closure plate of the device of example 1 of the present invention;
FIG. 4 is a schematic view of the structure of a melt feed pipe of the apparatus of example 1 of the present invention;
FIG. 5 is a top view of a devolatilizer plate of the apparatus of example 1 of the present invention;
FIG. 6 is a schematic view showing the structure of the annular gas pipe and the gas outlet pipe of the apparatus of example 1 of the present invention.
The reference numerals are: the device comprises a shell 1, an upper sealing plate 2, a melt feeding pipe 3, a devolatilization plate 4, devolatilization holes 5, a melt outlet 6, a heating medium jacket 8, a heating medium heating pipe 9, a spiral belt scraper 10, a scraper driving shaft 11, a flange 12, a distribution branch pipe 31, an outer edge non-hole distribution area 41, an annular hole distribution area 42, an inner edge non-hole distribution area 43, an annular air pipe 71, a gas outlet pipe 72, an air hole 73, a baffle 74, a heating medium inlet 81, a heating medium outlet 82, a heating medium inlet 91 and a heating medium outlet 92.
Detailed Description
The invention is further described below with reference to examples. The devices, connection structures and methods referred to in this invention are those well known in the art, unless otherwise specified.
Example 1
A nylon 6 melt fine devolatilization apparatus, as shown in fig. 1-2, comprising: a housing 1; an upper sealing plate 2 which is covered at the opening of the top of the shell; two melt feed pipes 3 arranged on the upper sealing plate; a devolatilization plate 4 disposed within the housing; the vacuumizing mechanism is positioned below the devolatilization distribution plate; a heating mechanism for providing heat to the inner cavity of the shell; a wall scraping mechanism arranged at the bottom of the inner cavity of the shell and a melt outlet 6 arranged at the bottom of the shell. Wherein:
as shown in fig. 1, the housing is divided into upper and lower parts and is connected by a flange 12.
As shown in fig. 3-4, the bottom outlet of each of the melt feed pipes diverges into two distribution branches 31. The four distribution branch pipes uniformly face to the devolatilization plate.
As shown in fig. 1-2, the devolatilization plate divides the shell into a melt distribution chamber and a vacuum devolatilization chamber, and the vacuum devolatilization chamber occupies about 2/3 of the space. As shown in fig. 5, the devolatilization plate is divided into an outer edge non-perforated area 41, an annular perforated area 42 and an inner edge non-perforated area 43; the devolatilization holes are uniformly distributed in the annular hole distribution area (2 circles are radially arranged), and the annular hole distribution area is lower than the outer edge non-hole distribution area and the inner edge non-hole distribution area. The axial section of the devolatilization hole is in a shape with a big top and a small bottom. Preferably the upper part is hemispherical and the lower part is vertically tubular. The thickness of the devolatilization distribution plate is 15mm; the diameter of the upper part of the devolatilization hole is 2mm, and the diameter of the lower part is 1/3 of that of the upper part.
As shown in fig. 6, the vacuum pumping mechanism comprises an annular air pipe 71 horizontally arranged below the devolatilization plate, two air outlet pipes 72 oppositely connected to the annular air pipe, and a vacuum pump arranged outside the shell; the annular air pipe is communicated with the vacuumizing pump through an air outlet pipe; the annular air pipe is uniformly distributed with air holes 73, and a semi-open baffle 74 is arranged at the air holes. The diameter of the annular air pipe is larger than that of the annular hole distribution area. The vacuum pump is a rotary vane vacuum pump.
As shown in fig. 1-2, the heating mechanism comprises a heating medium jacket 8 which is wrapped on the outer side wall of the shell and a heating medium heating pipe 9 which is vertically arranged in the center of the inner cavity of the shell. A heating medium inlet 81 and a heating medium outlet 82 are arranged on the heating medium jacket; the heating medium inlet 91 of the heating medium heating pipe is arranged on the outer wall of the bottom of the shell, and the heating medium outlet 92 is fixed on the upper sealing plate and extends to the outside.
As shown in fig. 1-2, the wall scraping mechanism comprises a spiral belt scraper 10, a scraper driving shaft 11 and an external driver, wherein the spiral belt scraper is clung to the inner wall of the shell, and the scraper driving shaft 11 is in linkage with the spiral belt scraper. The inner wall of the shell and the surface of the spiral band scraper are provided with non-stick coatings.
Example 2
Example 2 differs from example 1 only in that: the devolatilization holes are uniformly distributed in the annular hole distribution area, and are arranged for 3 circles in the radial direction). The thickness of the devolatilization distribution plate is 10mm; the devolatilization holes have a diameter of 1mm and the lower portion has a diameter of 1/3 of the upper portion. The vacuum pump is a molecular vacuum pump.
Example 3
Example 2 differs from example 1 only in that: the devolatilization holes are uniformly distributed in the annular hole distribution area and are radially arranged for 3 circles), and the thickness of the devolatilization distribution plate is 25mm; the devolatilization holes have a diameter of 3mm and the lower portion has a diameter of 1/3 of the upper portion. The vacuumizing pump is formed by connecting an injection vacuum pump and a diffusion injection pump in series.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural transformation made according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (14)
1. A nylon 6 melt fine devolatilization device, characterized by comprising:
a housing (1);
an upper sealing plate (2) which is covered at the opening of the top of the shell;
a melt feed pipe (3) arranged on the upper sealing plate;
the devolatilization distribution plate (4) is arranged in the shell and divides the shell into an upper part and a lower part of a melt distribution cavity and a vacuum devolatilization cavity; a plurality of devolatilization holes (5) are distributed on the devolatilization distribution plate; the axial section of the devolatilization hole is in a shape with a big upper part and a small lower part, the upper part of the devolatilization hole is hemispherical, and the lower part of the devolatilization hole is in a vertical thin tube shape; the diameter of the devolatilization hole is 0.1-5mm; the length-diameter ratio of the devolatilization holes is 1.5-2.5;
the vacuumizing mechanism is positioned below the devolatilization distribution plate;
a heating mechanism for providing heat to the inner cavity of the shell;
and a melt outlet (6) arranged at the bottom of the shell.
2. The fine devolatilization device of nylon 6 melt as defined in claim 1, wherein said devolatilization plate is divided into an outer edge non-perforated area (41), an annular perforated area (42) and an inner edge non-perforated area (43); the devolatilization holes are uniformly distributed in the annular hole distribution area, and the annular hole distribution area is lower than the outer edge non-hole distribution area and the inner edge non-hole distribution area.
3. The fine devolatilizer as claimed in claim 1, wherein,
the thickness of the devolatilization distribution plate is 10-25mm;
the devolatilization holes are arranged for 2-3 circles in the radial direction of the annular hole distribution area.
4. The fine devolatilizer of nylon 6 melt as defined in claim 1, wherein the bottom outlet of the melt feed tube is a plurality of distribution branches (31) uniformly oriented toward the devolatilizer plate.
5. The fine devolatilizer of nylon 6 melt as defined in claim 2, wherein said vacuum pumping means comprises an annular air tube (71) horizontally positioned below the devolatilization plate, a gas outlet tube (72) and a vacuum pump disposed outside the housing; the annular air pipe is communicated with the vacuumizing pump through an air outlet pipe; the annular air pipe is uniformly distributed with air holes (73).
6. The fine devolatilizer of nylon 6 melt as defined in claim 5, wherein semi-open baffles (74) are provided at the air holes of said annular air tube.
7. The fine devolatilizer of nylon 6 melt as defined in claim 5 in which the number of gas outlet tubes is a plurality and equally spaced around the circumference of the annular gas tube.
8. The fine devolatilizer of nylon 6 melt as defined in claim 5 in which the vacuum pump is one or more of a rotary vane vacuum pump, molecular vacuum pump, jet vacuum pump, diffusion pump and diffusion jet pump in series.
9. The fine devolatilizer of nylon 6 melt as defined in claim 5 in which the diameter of said annular air tube is greater than the diameter of the annular perforated area.
10. The nylon 6 melt fine devolatilization device as defined in claim 1, wherein the heating mechanism comprises a heating medium jacket (8) wrapped on the outer side wall of the shell and a heating medium heating pipe (9) vertically arranged in the center of the inner cavity of the shell.
11. The nylon 6 melt fine devolatilization device as claimed in claim 10, wherein the heat medium jacket is provided with a heat medium inlet (81) and a heat medium outlet (82); the heating medium inlet (91) of the heating medium heating pipe is arranged on the outer wall of the bottom of the shell, and the heating medium outlet (92) is fixed on the upper sealing plate and extends to the outside.
12. The nylon 6 melt fine devolatilization device as defined in claim 1, wherein a wall scraping mechanism is provided at the bottom of the inner cavity of the housing; the wall scraping mechanism comprises a spiral belt scraper (10) which is clung to the inner wall of the shell, a scraper driving shaft (11) which is linked with the spiral belt scraper and an external driver.
13. The fine devolatilizer of nylon 6 melt as defined in claim 12 in which the inner wall of the housing and the surface of the ribbon scraper are provided with a non-stick coating.
14. The fine devolatilizer of nylon 6 melt as defined in claim 1 in which the housing is divided into upper and lower sections connected by flanges (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110726709.XA CN113461937B (en) | 2021-06-29 | 2021-06-29 | Fine devolatilization device for nylon 6 melt |
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| CN202110726709.XA CN113461937B (en) | 2021-06-29 | 2021-06-29 | Fine devolatilization device for nylon 6 melt |
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| CN113461937B true CN113461937B (en) | 2023-04-28 |
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| SG182493A1 (en) * | 2010-01-14 | 2012-08-30 | List Holding Ag | A vacuum devolatilizer |
| CN212269953U (en) * | 2020-03-04 | 2021-01-01 | 浙江恒澜科技有限公司 | Nylon 6 melt devolatilization reaction kettle and devolatilization device |
| CN111574709B (en) * | 2020-03-05 | 2022-11-15 | 浙江恒逸石化研究院有限公司 | Multistage devolatilization device for nylon 6 melt |
| CN111393633B (en) * | 2020-03-06 | 2022-09-23 | 浙江恒逸石化研究院有限公司 | Caprolactam polymerization method capable of realizing direct melt processing |
| CN215855860U (en) * | 2021-06-29 | 2022-02-18 | 浙江恒澜科技有限公司 | Fine devolatilization device for nylon 6 melt |
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