CN215855860U - Fine devolatilization device for nylon 6 melt - Google Patents
Fine devolatilization device for nylon 6 melt Download PDFInfo
- Publication number
- CN215855860U CN215855860U CN202121464767.1U CN202121464767U CN215855860U CN 215855860 U CN215855860 U CN 215855860U CN 202121464767 U CN202121464767 U CN 202121464767U CN 215855860 U CN215855860 U CN 215855860U
- Authority
- CN
- China
- Prior art keywords
- devolatilization
- melt
- nylon
- shell
- annular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to the field of nylon production equipment, and discloses a nylon 6 melt fine devolatilization device, which comprises: a housing; an upper sealing plate covering the opening at the top of the shell; the melt feeding pipe is arranged on the upper sealing plate; the devolatilization distribution plate is arranged in the shell and divides the shell into 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; a melt outlet arranged at the bottom of the shell. The device can meet the devolatilization characteristic of the 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 utility model relates to the field of nylon production equipment, in particular to a nylon 6 melt fine devolatilization device.
Background
The conversion of hydrolytic polymerization of caprolactam is typically around 90%, meaning that around 10% of caprolactam monomer and oligomer (also known as hot water extractables, where monomer is about 75% and oligomer is about 25%) remain in the polymer, and these impurities in the melt have a significant impact on spinning. Therefore, before the spinning of PA6, the chips need to be subjected to extraction treatment, and according to FZ/T51004-2011, the hot water extractables content of the PA6 chips is less than 0.5wt% (superior products). At present, the hot water continuous extraction process is widely adopted in industry to extract monomers and oligomers in PA6 chips, so that the content of extractables in the chips 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, in the production process of PA6 slices, the energy consumption in the extraction and drying processes accounts for 15-20% of that in the production process of PA6 slices, so that the production cost of PA6 fibers is greatly increased. In order to eliminate the defects, the PA6 spinning technology is pushed to the direction of direct spinning in the future, and compared with the spinning by a slicing method, the melt direct spinning technology can greatly simplify the production flow, has low capital construction investment per unit yield and is beneficial to further reducing the production cost of fibers.
The main method for reducing the hot water extractable content in the caprolactam hydrolysis polymerization process is to control the polymerization temperature, because the caprolactam polymerization is a balance relation which changes along with the temperature change, and the hot water extractable content is more favorably generated along with the temperature rise, especially cyclic oligomer, so that the hot water extractable content can be effectively controlled by controlling the polymerization temperature, namely low-temperature polymerization. In order to ensure that the polymerization process is carried out in a liquid state, the polymerization temperature is required to be at least 10 ℃ below the melting point of nylon 6, the polymerization temperature can not control the hot water extractables in the range of direct spinning by a fusible body, and the low-temperature polymerization has another defect that the reaction speed is slow, and the molecular weight of the obtained polymer is low; spinning fibres from low temperature polymers requires that the polymer be raised to processing temperature, however, since the reaction is in chemical equilibrium and forms low molecular weight compounds, there is no advantage over normal polymerisation processes and therefore other processes are necessary to reduce the hot water extractables content of the melt.
The applicant found that in the previous studies, under certain devolatilization conditions, the monomer in the nylon 6 melt can be effectively removed, and in the process, the removal of the monomer can also drive other oligomers, especially cyclic dimer, to sublimate and be removed from the melt, thereby providing a way for reducing the content of hot water extractables in the nylon 6 melt. Therefore, the development of a special devolatilization device for nylon 6 is a trend of development of the nylon 6 industry, so that the content of hot water extractables in a nylon 6 melt is reduced, and the high-efficiency recycling of the hot water extractables is realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a nylon 6 melt fine devolatilization device. The device can meet the devolatilization characteristic of the 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 utility model is as follows: a nylon 6 melt fine devolatilization device, comprising:
a housing;
the upper sealing plate is covered on the opening at the top of the shell;
the melt feeding pipe is arranged on the upper sealing plate;
the devolatilization distribution plate is arranged in the shell and divides the shell into a melt distribution cavity and an upper part and a lower part of a vacuum devolatilization cavity; a plurality of devolatilization holes are distributed on the devolatilization distribution plate;
a vacuum pumping mechanism positioned below the devolatilization distribution plate;
the heating mechanism provides heat for the inner cavity of the shell;
a melt outlet arranged at the bottom of the shell.
The working principle of the fine devolatilization device is as follows: before spinning, the nylon 6 melt enters a melt distribution cavity in a shell from a melt feeding pipe through a pressure pump, the melt uniformly flows into the surface of a devolatilization distribution plate, and the melt is sprayed or extruded to form a trickle in the process of passing through a devolatilization hole under the heating condition and enters a vacuum devolatilization cavity due to the higher pressure of the melt distribution cavity. In the process, the devolatilization area of the melt is remarkably increased, and in the heating vacuum state of the thin-flow melt, the gas monomers and oligomers are separated from the melt, are gathered at the top of the vacuum devolatilization cavity and are pumped out by a vacuum pumping mechanism. And finally discharging the devolatilized nylon melt from a melt outlet. After the fine devolatilization treatment, the content of the extractables in the medium-hot water of the nylon melt can be reduced from about 3 percent to less than 1.5 percent by weight, and the content of the cyclic dimer is reduced to less than 0.3 percent by weight. The structure of the device can realize the devolatilization process of nylon 6, realize uniform heating and uniform distribution of materials, and control the reaction temperature within a reasonable small range, thereby achieving the devolatilization effect.
To sum up, the fuse-element can realize nylon 6's the process of taking off and wave after the device is taken off and wave to the essence, realizes that the material is heated evenly, and the distribution is even, makes reaction temperature difference control within reasonable range to reach stable, efficient and take off and wave the effect.
Compared with the traditional disk devolatilizer and the film evaporator, the device has less contact with PA6 melt in the devolatilization process, avoids the problem that the melt quality is influenced by the gel formed by the high-viscosity melt sticking to the wall, prolongs the maintenance period of the equipment and reduces the maintenance cost of the equipment.
Preferably, the devolatilization hole has a shape with a large top and a small bottom in an axial cross section.
Preferably, the devolatilization hole has a hemispherical upper portion and a vertically elongated tubular lower portion.
The design of the devolatilization hole shape can ensure the flowing stability of the melt to the maximum extent.
Preferably, the thickness of the devolatilization distribution plate is 10-25 mm. 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 at the upper part.
The diameter of the upper part of the devolatilization hole is limited within the range of 0.1-5mm, and the diameter of the hole can be adjusted according to the melt viscosity in actual production.
Preferably, the bottom outlet of the melt feed pipe is provided with a plurality of distribution branches uniformly facing the devolatilization plate.
The design can ensure that the melt can uniformly flow into the vacuum devolatilization cavity through the devolatilization distribution plate.
Preferably, the devolatilization distribution plate is divided into an outer edge non-cloth hole area, an annular cloth hole area and an inner edge non-cloth hole area; the devolatilization holes are uniformly distributed in the annular cloth hole area, and the annular cloth hole area is lower than the outer edge non-cloth hole area and the inner edge non-cloth hole area.
Preferably, the vacuumizing mechanism comprises an annular gas pipe horizontally positioned below the devolatilization distribution plate, a gas outlet pipe and a vacuumizing pump arranged outside the shell; the annular gas pipe is communicated with the vacuum pumping pump through a gas outlet pipe; the annular air pipe is uniformly distributed with air holes.
The device considers that the flowing of gas can influence the thin-flow melt during vacuum pumping, for example, the single flow flowing out from each devolatilization hole is easily crossed under the influence of the gas flow, so that the thin flow is disturbed and even broken, the devolatilization area is large in fluctuation, and the devolatilization effect is unstable. The positions of the annular distribution hole areas of the devolatilization distribution plate are designed to be lower than the outer edge non-distribution hole area and the inner edge non-distribution hole area, and meanwhile, the annular air pipes are arranged around the annular distribution hole areas for vacuumizing, so that the gas flowing process can be dispersed, the gas is not directly opposite to the melt direction, and the interference of gas flowing in the devolatilization process of the thin-flow melt can be avoided to the greatest extent.
Preferably, the devolatilization holes are arranged in the radial direction of the annular cloth hole area for 2 to 3 turns.
Preferably, a semi-open baffle is arranged at the air hole of the annular air pipe.
In order to further avoid the disturbance of the vacuumizing to the melt trickle and prevent the melt from being pumped into the air hole to cause blockage, the device is provided with a semi-open baffle at the air hole, so that the situation can be avoided to the maximum extent.
Preferably, the number of the gas outlet pipes is multiple, and the gas outlet pipes are distributed on the circumference of the annular gas pipe at equal intervals.
Preferably, the vacuum pumping pump is one or a combination of multiple stages of a rotary vane vacuum pump, a molecular vacuum pump, a jet vacuum pump, a diffusion pump and a diffusion jet pump.
Preferably, the diameter of the annular air pipe is larger than that of the annular cloth hole area.
The design can ensure that the annular air pipe is positioned around the annular cloth hole area during vacuum pumping, and the devolatilization gas separated from the melt can be quickly and directly pumped away.
Preferably, the heating mechanism comprises a heating medium jacket arranged 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 only a single heating medium jacket is arranged outside the shell, the heat transfer effect of the materials in a vacuum state can be weakened, the temperature of the innermost side and the outermost side melt in the shell has an obvious temperature difference, and the melt close to the shell has higher reaction temperature than the melt at the center, so that the melt uniformity is poor. Therefore, the heating mechanism of the device consists of two parts, wherein one part is arranged on a heating medium jacket outside the shell for heating in a segmented manner, and the other part is additionally 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 in the whole shell is uniformly distributed, and the devolatilization effect is obvious.
Preferably, a heating medium inlet and a heating medium outlet are arranged on the heating medium jacket; 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, the bottom of the inner cavity of the shell is provided with a wall scraping mechanism; the wall scraping mechanism comprises a spiral belt scraper tightly attached to the inner wall of the shell, a scraper driving shaft linked with the spiral belt scraper and an external driver.
The nylon melt flows into the bottom of the shell after devolatilization, and is easy to deposit 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 belt scraper are provided with non-stick coatings.
The parts can avoid the adhesion and accumulation of sticky materials on the surfaces of the parts after non-stick treatment.
Preferably, the housing is divided into an upper part and a lower part, and is connected through a flange.
Compared with the prior art, the utility model 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%, and the cyclic dimer content can be less than 0.3 wt%.
(2) During the vacuum pumping, the flow of gas is considered to influence the thin flow melt, so that the devolatilization effect is unstable. The device designs the position of the annular cloth hole area of the devolatilization distribution plate to be lower than the outer edge non-cloth hole area and the inner edge non-cloth hole area, and simultaneously arranges annular air pipes around the annular cloth hole area, and the air holes of the annular air pipes are provided with semi-open baffles. The gas flowing process can be dispersed, so that the gas does not directly face to the melt direction, and the interference of gas flowing on the thin-flow melt in the devolatilization process can be avoided to the maximum extent.
(3) The axial section of the devolatilization hole of the device is in a shape with a big top and a small bottom. The design of the devolatilization hole shape can ensure the flowing stability of the melt to the maximum extent.
(4) This device designs inside and outside heat medium binary channels, has guaranteed thermal supply volume, avoids the melt temperature that the volatile desorption in-process caused to fluctuate by a wide margin, in addition, has also guaranteed the material thermally equivalent, guarantees the homogeneity of each trickle.
(5) Compared with the traditional disc reactor and film evaporator, the device has less contact with PA6 melt in the devolatilization process, avoids the problem that the melt quality is influenced by the gel formed by the high-viscosity melt sticking to the wall, prolongs the maintenance period of the equipment and reduces the maintenance cost of the equipment.
Drawings
FIG. 1 is a front cross-sectional view of an apparatus according to example 1 of the present invention;
FIG. 2 is a side sectional view of an apparatus according to example 1 of the present invention;
FIG. 3 is a top view of an upper closure plate of the apparatus of example 1 of the present invention;
FIG. 4 is a schematic diagram of the melt feed tube of the apparatus of example 1 of the present invention;
FIG. 5 is a top view of a devolatilization plate of the apparatus of example 1 in accordance with the present invention;
FIG. 6 is a schematic structural diagram of the annular gas pipe and the gas outlet pipe of the device in example 1 of the present invention.
The reference signs are: the device comprises a shell 1, an upper closing plate 2, a melt feeding pipe 3, a devolatilization distribution plate 4, devolatilization holes 5, a melt outlet 6, a heat medium jacket 8, a heat 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-cloth hole area 41, an annular cloth hole area 42, an inner edge non-cloth hole area 43, an annular gas pipe 71, a gas outlet pipe 72, a gas hole 73, a baffle 74, a heat medium inlet 81, a heat medium outlet 82, a heating medium inlet 91 and a heating medium outlet 92.
Detailed Description
The present invention will be further described with reference to the following examples. The devices, connections, and methods referred to in this disclosure are those known in the art, unless otherwise indicated.
Example 1
A nylon 6 melt fine devolatilization device as shown in fig. 1-2, comprising: a housing 1; the upper sealing plate 2 is covered on the opening at the top of the shell; two melt feed pipes 3 arranged on the upper sealing plate; a devolatilization distribution plate 4 arranged in the shell; a vacuum pumping mechanism positioned below the devolatilization distribution plate; the heating mechanism provides heat for 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 portions, which are connected by a flange 12.
As shown in fig. 3-4, the bottom outlet of each melt feed pipe branches into two distribution branches 31. The four distributing branch pipes are uniformly faced to the devolatilization distributing plate.
As shown in fig. 1-2, the devolatilization distribution plate divides the shell into a melt distribution chamber and a vacuum devolatilization chamber, which occupies about 2/3 of space. As shown in fig. 5, the devolatilization distribution plate is divided into an outer edge non-perforated region 41, an annular perforated region 42, and an inner edge non-perforated region 43; the devolatilization holes are uniformly distributed in the annular cloth hole area (arranged for 2 circles in the radial direction), and the annular cloth hole area is lower than the outer edge non-cloth hole area and the inner edge non-cloth hole area. The devolatilization hole has a shape with a large top and a small bottom in an axial cross section. Preferably, the upper part is hemispherical, and the lower part is vertically thin tubular. The thickness of the devolatilization distribution plate is 15 mm; the diameter of the upper part of the devolatilization hole was 2mm, and the diameter of the lower part was 1/3 at the upper part.
As shown in fig. 6, the vacuum pumping mechanism comprises an annular gas pipe 71 horizontally located below the devolatilization distribution plate, two gas outlet pipes 72 oppositely connected to the annular gas pipe, and a vacuum pump arranged outside the casing; the annular gas pipe is communicated with the vacuum pumping pump through a gas outlet pipe; air holes 73 are uniformly distributed on the annular air pipe, and semi-open baffles 74 are arranged at the air holes. The diameter of the annular air pipe is larger than that of the annular cloth hole area. The vacuum pump is a rotary vane vacuum pump.
As shown in fig. 1-2, the heating mechanism includes a heating medium jacket 8 wrapped on the outer side wall of the casing and a heating medium heating pipe 9 vertically arranged in the center of the inner cavity of the casing. A heating medium inlet 81 and a heating medium outlet 82 are formed in 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 includes a spiral scraper 10 closely attached to the inner wall of the housing, a scraper driving shaft 11 linked with the spiral scraper, and an external driver. And non-stick coatings are arranged on the inner wall of the shell and the surface of the spiral belt scraper.
Example 2
Example 2 differs from example 1 only in that: the devolatilization holes are uniformly distributed in the annular cloth hole area and are arranged for 3 circles in the radial direction). The thickness of the devolatilization distribution plate is 10 mm; the diameter of the devolatilization hole was 1mm, and the diameter of the lower part was 1/3 at the upper part. 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 cloth hole area and are radially arranged for 3 circles), and the thickness of the devolatilization distribution plate is 25 mm; the diameter of the devolatilization hole was 3mm, and the diameter of the lower part was 1/3 at the upper part. The vacuum pumping pump is formed by connecting an injection vacuum pump and a diffusion injection pump in series.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a nylon 6 fuse-element essence devolatilization device which characterized in that includes:
a housing (1);
an upper sealing plate (2) which covers the opening at the top of the shell;
a melt feeding pipe (3) arranged on the upper sealing plate;
the devolatilization distribution plate (4) is arranged in the shell and divides the shell into a melt distribution cavity and an upper part and a lower part of a vacuum devolatilization cavity; a plurality of devolatilization holes (5) are distributed on the devolatilization distribution plate;
a vacuum pumping mechanism positioned below the devolatilization distribution plate;
the heating mechanism provides heat for the inner cavity of the shell;
a melt outlet (6) arranged at the bottom of the shell.
2. The nylon 6 melt finishing devolatilization apparatus as claimed in claim 1 wherein said devolatilization distribution plate is divided into an outer edge non-perforated region (41), an annular perforated region (42) and an inner edge non-perforated region (43); the devolatilization holes are uniformly distributed in the annular cloth hole area, and the annular cloth hole area is lower than the outer edge non-cloth hole area and the inner edge non-cloth hole area.
3. The nylon 6 melt fine devolatilization apparatus as claimed in claim 1 or claim 2 wherein said devolatilization holes have an axial cross-section which is in the form of a large top and a small bottom.
4. The nylon 6 melt devolatilization apparatus as claimed in claim 3 wherein said devolatilization holes are hemispherical in upper portion and vertically elongated tubular in lower portion.
5. The nylon 6 melt fine devolatilization apparatus as claimed in claim 1 wherein the bottom outlets of said melt feed lines are a plurality of distribution legs (31) directed uniformly toward the devolatilization distributor plate.
6. The nylon 6 melt fine devolatilization apparatus as claimed in claim 2, wherein said evacuation mechanism comprises an annular gas pipe (71) horizontally disposed below the devolatilization distribution plate, a gas outlet pipe (72), and an evacuation pump disposed outside the casing; the annular gas pipe is communicated with the vacuum pumping pump through a gas outlet pipe; air holes (73) are uniformly distributed on the annular air pipe.
7. The nylon 6 melt fine devolatilization device as claimed in claim 6, wherein a semi-open baffle (74) is arranged at the air hole of said annular air pipe.
8. The nylon 6 melt devolatilizer as claimed in claim 6 wherein said annular gas tube has a diameter greater than the diameter of the annular perforated area.
9. The nylon 6 melt fine devolatilization device as claimed in claim 1, wherein said heating means comprises a heating medium jacket (8) wrapped around the outer side wall of the casing and a heating medium heating pipe (9) vertically disposed at the center of the inner cavity of the casing.
10. The nylon 6 melt fine devolatilization device as claimed in claim 1, wherein a wall scraping mechanism is provided at the bottom of the inner cavity of said casing; the wall scraping mechanism comprises a spiral belt scraper (10) clinging to the inner wall of the shell, a scraper driving shaft (11) linked with the spiral belt scraper and an external driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121464767.1U CN215855860U (en) | 2021-06-29 | 2021-06-29 | Fine devolatilization device for nylon 6 melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121464767.1U CN215855860U (en) | 2021-06-29 | 2021-06-29 | Fine devolatilization device for nylon 6 melt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215855860U true CN215855860U (en) | 2022-02-18 |
Family
ID=80335926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121464767.1U Active CN215855860U (en) | 2021-06-29 | 2021-06-29 | Fine devolatilization device for nylon 6 melt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215855860U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461937A (en) * | 2021-06-29 | 2021-10-01 | 浙江恒澜科技有限公司 | Fine devolatilization device for nylon 6 melt |
-
2021
- 2021-06-29 CN CN202121464767.1U patent/CN215855860U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461937A (en) * | 2021-06-29 | 2021-10-01 | 浙江恒澜科技有限公司 | Fine devolatilization device for nylon 6 melt |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4981554A (en) | Thin-layer evaporator for high-viscosity, fluids | |
| US8556610B2 (en) | Method for the production of polyester granulates from highly viscous polyester melts and also device for the production of the polyester granulates | |
| CA1231197A (en) | Process for the continuous demonomerization and postcondensation of polyamide 6 and device for carrying out this process | |
| CN215855860U (en) | Fine devolatilization device for nylon 6 melt | |
| CN209205310U (en) | Falling film type devolatilizer and its falling liquid film element | |
| CN113461937A (en) | Fine devolatilization device for nylon 6 melt | |
| CN112321754B (en) | Polymer solution devolatilization device and method | |
| CN111574709B (en) | Multistage devolatilization device for nylon 6 melt | |
| CN110639461B (en) | Falling film devolatilizer and falling film element thereof | |
| CN113304709B (en) | Devolatilization device and SAN resin devolatilization process | |
| CN215841705U (en) | Devolatilization device before polymer melt spinning | |
| CN212269953U (en) | Nylon 6 melt devolatilization reaction kettle and devolatilization device | |
| US5558819A (en) | Downflow heater plant for briefly heating a liquid with steam | |
| CN111333834B (en) | Devolatilization method of nylon 6 melt | |
| US4134736A (en) | Steam-polymer separation apparatus | |
| CN209734997U (en) | Polymer takes off and waves device | |
| CN115624791A (en) | Falling film devolatilizer with multilayer crossed horizontal tubes | |
| CN113120869B (en) | Insoluble sulfur production method and production system | |
| CN113463214B (en) | Nylon 6 melt direct spinning method and device | |
| CN111701553B (en) | Polymerization reactor suitable for high-viscosity PTT production | |
| CN1027571C (en) | Continuous digesting apparatus | |
| CN110280202B (en) | Final polycondensation reactor for preparing polycarbonate | |
| CN112194782A (en) | Device and method for producing PBT synthetic resin | |
| CN212263236U (en) | Multistage devolatilization device for nylon 6 melt | |
| CN220175596U (en) | Automatic dripping pill machine for processing Chinese patent medicine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 311200 29 Chenghu Road, Yaqian Town, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Hengyi Petrochemical Research Institute Co.,Ltd. Address before: 311200 29 Chenghu Road, Yaqian Town, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG HENGLAN TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |