A system and method for reducing volatile matter in a nylon liquid phase tackification reaction process

Abstract

The application relates to the field of reducing volatile matters in a polymer reaction process, and provides a system and a method for reducing volatile matters in a nylon liquid-phase tackifying reaction process.The system comprises a single-shaft tackifying reactor, a single-shaft screw conveyor, a double-shaft tackifying reactor, a condensing mechanism and a vacuum pump, the discharge port of the single-shaft tackifying reactor and the feed port of the double-shaft tackifying reactor are connected through the single-shaft screw conveyor, the gas-phase outlet at the top of the single-shaft tackifying reactor is provided with a first filtering device, the gas-phase outlet at the top of the double-shaft tackifying reactor is provided with a second filtering device, the first filtering device and the second filtering device are connected with the condensing mechanism, the condensing mechanism is connected with the vacuum pump, and the single-shaft tackifying reactor and the double-shaft tackifying reactor have a height difference and the single-shaft screw conveyor is vertically arranged.Through the organic combination of the single-shaft tackifying reactor and the double-shaft tackifying reactor, the volatile matters can be effectively reduced to improve the viscosity and the quality of the nylon, and the condensing mechanism is used for collecting and harmless treating the volatile matters.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reducing volatile components in polymer reaction process, and more particularly to a system and method for reducing volatile components in nylon liquid-phase tackifying reaction process. BACKGROUND

[0002] In the production process of high molecular materials such as nylon, water, oligomers and other low molecular weight by-products are produced, which are volatile components. Only by removing these by-products from the polymer body can the performance of nylon be improved and the polymerization degree of the product be improved. Therefore, the method and process for reducing volatile components in the nylon liquid-phase tackifying reaction process and the determination of related parameters are crucial.

[0003] In the production process of high viscosity nylon, the tackifying reaction is carried out in a liquid phase, and the viscosity of the liquid phase nylon is particularly high. The conventional method is to use flash tackifying and falling film evaporation tackifying. Due to the short residence time of the material in the equipment and the poor tackifying effect, the equipment is prone to be blocked. Single-shaft tackifying reactors or double-shaft tackifying reactors are also used for tackifying, but a single shaft tackifying reactor or a double-shaft tackifying reactor alone cannot meet the production technical requirements. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a system for reducing volatile components in the nylon liquid-phase tackifying reaction process, so as to solve the technical problem that a single shaft tackifying reactor or a double-shaft tackifying reactor alone cannot meet the production technical requirements in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a system for reducing volatile components in the nylon liquid-phase tackifying reaction process is provided, which comprises a single-shaft tackifying reactor, a single-shaft screw conveyor, a double-shaft tackifying reactor, a condensing mechanism and a vacuum pump. The discharge port of the single-shaft tackifying reactor and the feed port of the double-shaft tackifying reactor are connected by a single-shaft screw conveyor. A first filtering device is arranged at the gas phase outlet at the top of the single-shaft tackifying reactor. A second filtering device is arranged at the gas phase outlet at the top of the double-shaft tackifying reactor. The first filtering device and the second filtering device are both connected with the condensing mechanism. The condensing mechanism is connected with the vacuum pump. The single-shaft tackifying reactor and the double-shaft tackifying reactor have a height difference, and the single-shaft screw conveyor is vertically arranged.

[0006] In one embodiment, the condensing mechanism comprises a first condenser, a second condenser and a condensate collection tank connected in sequence. The first condenser is connected with the first filtering device and the second filtering device.

[0007] In one embodiment, the single-shaft viscosity increasing reactor comprises a shell, a single-shaft stirring shaft, and inner wall fixed blades, the distance between the tines of the single-shaft stirring shaft and the inner wall of the shell is 0-3mm, and the distance between the tines of the single-shaft stirring shaft and the inner wall fixed blades is 0-5mm.

[0008] In one embodiment, the double-shaft viscosity increasing reactor comprises a shell, two stirring shafts rotating in the same direction, one of which is a high-speed shaft and the other is a low-speed shaft, the rotating speed of the high-speed shaft is 5-20r / min, and the speed ratio of the low-speed shaft to the high-speed shaft is 2-16:20.

[0009] In one embodiment, the distance between the tines of the stirring shaft and the inner wall of the shell is 0-3mm, and the distance between the tines of the two stirring shafts is 0-3mm.

[0010] In one embodiment, the single-shaft viscosity increasing reactor and the double-shaft viscosity increasing reactor are both heated by heat-conducting oil.

[0011] In one embodiment, the double-shaft viscosity increasing reactor is provided with a gear pump at the discharge port.

[0012] Another object of the present application is to provide a method for reducing volatile components based on the above-mentioned system for liquid-phase viscosity increasing reaction of nylon, which comprises the following steps:

[0013] S1, the single-shaft viscosity increasing reactor and the double-shaft viscosity increasing reactor are heated and operated, and the vacuum pump is operated to vacuumize the single-shaft viscosity increasing reactor and the double-shaft viscosity increasing reactor;

[0014] S2, the polymerized nylon enters the single-shaft viscosity increasing reactor from the feeding port, the stirring shaft in the single-shaft viscosity increasing reactor rotates clockwise at a speed of 5-20r / min, at the same time, the nylon moves to the discharge port under the action of the stirring shaft, the nylon is heated in the single-shaft viscosity increasing reactor, the water, oligomers and solvents in the nylon material continuously overflow from the gas-liquid interface, are discharged through the first filtering device at the top, and the liquid-phase nylon with increased viscosity is transported to the discharge port;

[0015] S3, the liquid-phase nylon with a certain viscosity is forced to be transported into the double-shaft viscosity increasing reactor through the vertically arranged single-shaft screw conveyor;

[0016] S4, the water, oligomers and solvents separated from the liquid-phase nylon in step S2 are condensed and collected in the condensing mechanism under negative pressure through the first filtering device;

[0017] S5, when the liquid phase nylon with certain viscosity is conducted into the double shaft viscosity increasing reactor, the double stirring shafts of the double shaft viscosity increasing reactor rotate clockwise at the same speed of 5-20 r / min, the rake teeth on the double stirring shafts have self-cleaning function during the clockwise rotation, the liquid phase nylon moves to the discharge port under the action of the double stirring shafts, and the viscosity is continuously increased; at the same time, the nylon is heated in the double shaft viscosity increasing reactor, and the water, oligomers and solvents in the nylon material continuously overflow from the gas-liquid interface and are discharged through the second filtering device at the top;

[0018] S6, the liquid phase nylon meeting the viscosity requirement is discharged from the double shaft viscosity increasing reactor and is transported to the liquid phase viscosity increasing reaction section through the gear pump.

[0019] S7, the water, oligomers and solvents separated from the liquid phase nylon in step S5 are collected by condensation under negative pressure through the second filtering device.

[0020] In one embodiment, the heating temperature of the single shaft viscosity increasing reactor is 230-250℃, and the heating temperature of the double shaft viscosity increasing reactor is 250-300℃.

[0021] In one embodiment, the vacuum absolute pressure of the single shaft viscosity increasing reactor is within 1000 Pa, and the vacuum absolute pressure of the double shaft viscosity increasing reactor is within 100 Pa.

[0022] The system and method for reducing volatile components in the nylon liquid phase viscosity increasing reaction process provided in the application have the beneficial effect that the single shaft viscosity increasing reactor and the double shaft viscosity increasing reactor are organically combined through the vertically arranged single shaft screw conveyor, so that the volatile components are effectively reduced to increase the viscosity and quality of the nylon, and the volatile components are collected and treated harmlessly through the condensing mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The system structure schematic diagram for reducing volatile components in the nylon liquid phase viscosity increasing reaction process provided in the embodiments of the application.

[0025] In the drawings, various reference signs represent:

[0026] 1. Single shaft viscosity building reactor; 11. First feed valve; 12. First jacket inlet valve; 13. First jacket outlet valve; 2. Single shaft screw conveyor; 3. Double shaft viscosity building reactor; 31. Second feed valve; 32. Second jacket inlet valve; 33. Second jacket outlet valve; 4. Condensing mechanism; 41. First condenser; 42. Second condenser; 43. Condensate collection tank; 5. Vacuum pump; 6. First filter device; 7. Second filter device; 8. Centrifugal pump; 9. Gear pump. DETAILED DESCRIPTION

[0027] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] As Figure 1As shown, the embodiment provides a system for reducing volatile components in a nylon liquid-phase tackifying reaction process, which comprises a single-shaft tackifying reactor 1, a single-shaft screw conveyor 2, a double-shaft tackifying reactor 3, a condensing mechanism 4, and a vacuum pump 5. The discharge port of the single-shaft tackifying reactor 1 and the feed port of the double-shaft tackifying reactor 3 are connected by the single-shaft screw conveyor 2, the gas-phase outlet at the top of the single-shaft tackifying reactor 1 is provided with a first filtering device 6, the gas-phase outlet at the top of the double-shaft tackifying reactor 3 is provided with a second filtering device 7, the first filtering device 6 and the second filtering device 7 are connected with the condensing mechanism 4, the condensing mechanism 4 is connected with the vacuum pump 5, and the single-shaft tackifying reactor 1 and the double-shaft tackifying reactor 3 have a height difference and the single-shaft screw conveyor 2 is vertically arranged.

[0032] Specifically, the feed port of the single-shaft tackifying reactor 1 is provided with a first feed valve 11, and the feed port of the double-shaft tackifying reactor 3 is provided with a second feed valve 31. The nylon material after polymerization enters the single-shaft tackifying reactor 1 from the first feed valve 11, the single-shaft tackifying reactor 1 is used for preliminary tackifying of the nylon and discharges part of the volatile components to reduce the volatile components. The nylon material after tackifying by the single-shaft tackifying reactor 1 is forced to enter the double-shaft tackifying reactor 3 by the single-shaft screw conveyor 2 through the second feed valve 31 for further tackifying; at the same time, the volatile components are filtered by the first filtering device 6 and the second filtering device 7 while being discharged to prevent the nylon solid components from being taken out; the first filtering device 6 and the second filtering device 7 at least comprise a filter. After the volatile components are discharged, they are condensed and collected by the condensing mechanism 4 to prevent pollution to the air. The vacuum pump 5 is used for adjusting the absolute pressure in the single-shaft tackifying reactor 1 and the double-shaft tackifying reactor 3. The single-shaft screw conveyor 2 is vertically arranged to facilitate the forced input of the nylon material into the double-shaft tackifying reactor.

[0033] In the embodiment, the single-shaft tackifying reactor 1 and the double-shaft tackifying reactor 3 are organically combined by the vertically arranged single-shaft screw conveyor 2 to effectively reduce the volatile components and improve the viscosity and quality of the nylon. At the same time, the volatile components are collected and harmlessly treated by the condensing mechanism 4.

[0034] In the embodiment, the condensing mechanism 4 comprises a first condenser 41, a second condenser 42, and a condensate collection tank 43 connected in sequence, and the first condenser 41 is connected with the first filtering device 6 and the second filtering device 7 by pipelines. The first condenser 41 is used for preliminary cooling of the volatile components, the second condenser 42 is used for deep cooling of the volatile components, the condensed condensate is collected by the condensate collection tank 43, the non-condensed gas in the volatile components is discharged by the vacuum pump 5 and enters an RTO furnace for incineration treatment to meet the environmental emission index. The discharge pipe of the condensate collection tank 43 is provided with a centrifugal pump 8 for discharging the condensed liquid.

[0035] In the embodiment, the single-shaft viscosity increasing reactor 1 at least comprises a shell, a single-shaft stirring shaft and inner wall fixed blades, a plurality of rakes are arranged on the single-shaft stirring shaft at intervals, a plurality of inner wall fixed blades are arranged on the inner wall of the shell at intervals, and the inner wall fixed blades and the rakes are arranged alternately. In the embodiment, the distance between the rakes and the inner wall of the shell is 0-3 mm, preferably 1 or 2 mm; and the distance between the inner wall fixed blades and the rakes is 0-5 mm, preferably 1, 2, 3 or 4 mm. The smaller the distance, the greater the viscosity increasing effect.

[0036] In the embodiment, the double-shaft viscosity increasing reactor 3 at least comprises a shell and two co-rotating stirring shafts, one of which is a high-speed shaft and the other is a low-speed shaft, the rotating speed of the high-speed shaft is 5-20 r / min, and the speed ratio of the low-speed shaft to the high-speed shaft is 2-16:20. Specifically, the speed ratio of the low-speed shaft to the high-speed shaft is 16:20, or 8:20, or 4:20, or 2:20. A plurality of rakes are arranged on the stirring shafts at intervals, the rakes on the two stirring shafts are arranged alternately, the distance between the rakes on the stirring shafts and the inner wall of the shell is 0-3 mm, and the distance between the rakes on the two stirring shafts is 0-3 mm, preferably 1 or 2 mm. Preferably, the inner wall of the shell is provided with fixed blades arranged at intervals, and the fixed blades and the rakes are arranged alternately. During the co-rotation of the high-speed shaft and the low-speed shaft, the differential speed causes a pressure difference between the two stirring shafts for the internal nylon fluid, so that the mixed flow is uniform and there is no dead angle. At the same time, the rakes and the fixed blades on the stirring shafts have a self-cleaning function during the co-rotation, and the liquid-phase nylon moves towards the discharge port under the action of the double-shaft stirring shafts and the viscosity continuously increases.

[0037] In the embodiment, the single-shaft viscosity increasing reactor 1 and the double-shaft viscosity increasing reactor 3 are both heated by heat-conducting oil. Specifically, the single-shaft viscosity increasing reactor 1 is provided with a jacket in which heat-conducting oil is arranged, and the single-shaft viscosity increasing reactor 1 is provided with a first jacket inlet valve 12 and a first jacket outlet valve 13 for realizing the circulation of the heat-conducting oil. Similarly, the double-shaft viscosity increasing reactor 3 is provided with a jacket in which heat-conducting oil is arranged, and the double-shaft viscosity increasing reactor 3 is provided with a second jacket inlet valve 32 and a second jacket outlet valve 33 for realizing the circulation of the heat-conducting oil. In other embodiments, the single-shaft viscosity increasing reactor 1 and the double-shaft viscosity increasing reactor 3 can also be heated by electricity.

[0038] In the embodiment, the discharge port of the double-shaft viscosity increasing reactor 3 is provided with a gear pump 9 for conveying the nylon material after viscosity increasing to the liquid-phase viscosity increasing reaction section.

[0039] Another object of the present application is to provide a method for reducing volatile components based on the above-mentioned system for liquid-phase viscosity increasing reaction of nylon, which comprises the following steps:

[0040] S1, the single shaft viscosity increasing reactor 1 and the double shaft viscosity increasing reactor 3 are heated, the vacuum pump 5 is operated, and the single shaft viscosity increasing reactor 1 and the double shaft viscosity increasing reactor 3 are vacuumized,

[0041] S2, the nylon polymerized is introduced into the single shaft viscosity increasing reactor 1 from the feeding port of the single shaft viscosity increasing reactor 1, the stirring shaft in the single shaft viscosity increasing reactor 1 rotates clockwise at a speed of 5-20 r / min, meanwhile, the nylon moves to the discharging port of the single shaft viscosity increasing reactor 1 under the action of the stirring shaft, the nylon is heated in the single shaft viscosity increasing reactor 1, and the water, the oligomer and the solvent in the nylon material continuously overflow from the gas-liquid interface and are discharged through the first filtering device 6 on the top, the liquid phase nylon with reduced volatile matter and increased viscosity is transported to the discharging port;

[0042] S3, the liquid phase nylon with certain viscosity is forcedly transported into the double shaft viscosity increasing reactor 3 through the single shaft screw conveyor 2 arranged vertically;

[0043] S4, the water, the oligomer and the solvent separated from the liquid phase nylon in step S2 are introduced into the condensing mechanism 4 through the first filtering device 6 under negative pressure and are condensed and collected;

[0044] S5, when the liquid phase nylon with certain viscosity is introduced into the double shaft viscosity increasing reactor 3, the double stirring shafts of the double shaft viscosity increasing reactor 3 rotate clockwise at a speed of 5-20 r / min, the rake teeth on the double stirring shafts have a self-cleaning function in the process of clockwise rotation, the liquid phase nylon moves to the discharging port under the action of the double stirring shafts, and the viscosity continuously increases; meanwhile, the nylon is heated in the double shaft viscosity increasing reactor 3, the water, the oligomer and the solvent in the nylon material continuously overflow from the gas-liquid interface and are discharged through the second filtering device 7 on the top, the volatile matter is reduced again, and the viscosity of the liquid phase nylon is increased;

[0045] S6, the liquid phase nylon meeting the viscosity requirement is discharged from the outlet of the double shaft viscosity increasing reactor 3 and is transported to the liquid phase viscosity increasing reaction section through the gear pump 9;

[0046] S7, the water, the oligomer and the solvent separated from the liquid phase nylon in step S5 are introduced into the condensing mechanism 4 through the second filtering device 7 under negative pressure and are condensed and collected.

[0047] In the embodiment, the volatile matter discharged through the first filtering device 6 and the second filtering device 7 is initially cooled in the first condenser 41, is deeply cooled in the second condenser 42, and is collected in the condensate collecting tank 43 after deep cooling, and is discharged through the condensate pump.

[0048] In the embodiment, the heating temperature of the single shaft viscosity increasing reactor 1 is 230-250 DEG C, and the heating temperature of the double shaft viscosity increasing reactor 3 is 250-300 DEG C.

[0049] In the present embodiment, the vacuum absolute pressure of the single-axis tackifying reactor 1 is within 1000 Pa, and the vacuum absolute pressure of the double-axis tackifying reactor 3 is within 100 Pa. The lower the vacuum absolute pressure, the better the tackifying effect, but the cost is high; therefore, the vacuum absolute pressure in the single-axis tackifying reactor is set to be higher, so as to reduce the cost while ensuring the tackifying effect.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for reducing volatile matter in a nylon liquid-phase viscosity-enhancing reaction process, characterized in that: An apparatus for reducing volatile matter through a nylon liquid-phase thickening reaction process is described. The apparatus includes: a single-shaft thickening reactor (1), a single-shaft screw conveyor (2), a double-shaft thickening reactor (3), a condensation mechanism (4), and a vacuum pump (5). The outlet of the single-shaft thickening reactor (1) and the inlet of the double-shaft thickening reactor (3) are connected via the single-shaft screw conveyor (2). A first filter device (6) is provided at the gas phase outlet at the top of the single-shaft thickening reactor (1), and a second filter device (7) is provided at the gas phase outlet at the top of the double-shaft thickening reactor (3). Both the first filter device (6) and the second filter device (7) are connected to... The condensing mechanism (4) is connected to the vacuum pump (5). The single-axis thickening reactor (1) and the dual-axis thickening reactor (3) have a height difference and the single-axis screw conveyor (2) is vertically arranged. The single-axis thickening reactor (1) includes a shell, a single-axis stirring shaft and inner wall fixed blades. The dual-axis thickening reactor (3) includes a shell and two stirring shafts rotating in the same direction. One stirring shaft is a high-speed shaft and the other stirring shaft is a low-speed shaft. The vacuum absolute pressure of the single-axis thickening reactor (1) is within 1000 Pa and the vacuum absolute pressure of the dual-axis thickening reactor (3) is within 100 Pa. The method includes the following steps: S1. The uniaxial thickening reactor (1) and biaxial thickening reactor (3) are heated, and the vacuum pump (5) is used to evacuate the uniaxial thickening reactor (1) and biaxial thickening reactor (3). S2. The polymerized nylon enters the uniaxial thickening reactor (1) through the feed inlet. The stirring shaft inside the uniaxial thickening reactor (1) rotates clockwise at a speed of 5-20 r / min. At the same time, the nylon moves towards the discharge port of the uniaxial thickening reactor (1) under the action of the stirring shaft. The nylon is heated in the uniaxial thickening reactor (1). The moisture, oligomers and solvents in the nylon material continuously overflow from the gas-liquid interface and are discharged through the first filter device (6) at the top. At the same time, the liquid phase nylon with increased viscosity is transported to the discharge port. S3. Liquid nylon with a certain viscosity is forcibly transported to the biaxial thickening reactor (3) via a vertically set single-shaft screw conveyor (2); In steps S4 and S2, the water, oligomers and solvents extracted from the liquid nylon are collected by condensation in the condensation mechanism (4) under negative pressure through the first filter device (6). S5. When liquid nylon with a certain viscosity is introduced into the biaxial thickening reactor (3), the two stirring shafts of the biaxial thickening reactor (3) rotate clockwise in the same direction at a speed of 5-20 r / min. The rake teeth on the two stirring shafts have a self-cleaning function during the rotation in the same direction. The liquid nylon moves towards the discharge port under the action of the two stirring shafts, and the viscosity increases continuously. At the same time, the nylon is heated in the biaxial thickening reactor (3), and the water, oligomers and solvents in the nylon material continuously overflow from the gas-liquid interface and are discharged through the second filter device (7) at the top. S6. Liquid nylon that meets the viscosity requirements is discharged from the outlet of the biaxial thickening reactor (3) and transported to the liquid phase thickening reaction section by the gear pump (9). In steps S7 and S5, the water, oligomers and solvents extracted from the liquid nylon are collected by condensation in the condensation mechanism (4) under negative pressure through the second filter device (7).

2. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: The condensation mechanism (4) includes a first condenser (41), a second condenser (42) and a condensate collection tank (43) connected in sequence. The first condenser (41) is connected to the first filter device (6) and the second filter device (7).

3. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: The distance between the rake teeth on the single-shaft stirring shaft and the inner wall of the shell is 0-3mm, and the distance between the fixed blades on the inner wall and the rake teeth on the single-shaft stirring shaft is 0-5mm.

4. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: The high-speed shaft rotates at a speed of 5-20 r / min, and the speed ratio of the low-speed shaft to the high-speed shaft is 2-16:

20.

5. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 4, characterized in that: The distance between the rake teeth of the stirring shaft and the inner wall of the shell is 0-3mm, and the distance between the rake teeth of the two stirring shafts is 0-3mm.

6. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: Both the uniaxial thickening reactor (1) and the biaxial thickening reactor (3) are heated using heat transfer oil.

7. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: A gear pump (9) is installed at the outlet of the biaxial thickening reactor (3).

8. The method for reducing volatile matter in the nylon liquid-phase thickening reaction process as described in claim 1, characterized in that: The heating temperature of the uniaxial thickening reactor (1) is 230℃-250℃, and the heating temperature of the biaxial thickening reactor (3) is 250℃-300℃.

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