A continuous twin-screw dynamic devolatilizer with forced split flow

Abstract

The utility model discloses a kind of continuous double screw dynamic devolatilizers with forced shunt, from the end of devolatilizer to front end is equipped with rear exhaust section, feeding section, first stage stripping section, first stage devolatilization section, second stage stripping section, second stage devolatilization section, third stage stripping section, third stage devolatilization section and conveying / mixing section in sequence.Wherein:rear exhaust section, third stage stripping section and third stage devolatilization section can not be set according to need.By designing the shell and screw structure of new continuous double screw dynamic devolatilizer, using new forced shunt technology, the devolatilization area and surface renewal rate of continuous double screw dynamic devolatilizer are greatly improved, and the dynamic devolatilization effect is strengthened;Meanwhile, no kneading block or any strong shear thread element is set in the continuous double screw dynamic devolatilizer, effectively avoiding the reduction of polymer molecular weight and color change caused by high shear.

Description

Technical Field

[0001] This utility model relates to the field of polymer production and processing technology, and in particular to a continuous twin-screw dynamic devolatilizer with forced diversion. Background Technology

[0002] During polymer synthesis, most polymer systems exiting the reactor contain low-molecular-weight components such as monomers, solvents, water, and reaction byproducts, collectively referred to as volatiles. The content of these volatiles can reach tens of percent. The process of removing these volatiles from the polymer bulk is called devolatilization, which can improve the degree of polymerization and performance of the polymer, recover residual monomers and solvents, remove odors, and meet health and environmental requirements. Depending on the application of the polymer product, the target volatile concentration in the devolatilization process can range from several thousand to tens of ppm (parts per million). The energy consumption of the devolatilization process accounts for more than 60% of the total energy consumption in the entire polymer synthesis process. Therefore, efficient devolatilization is an important means to reduce polymer production costs and improve product quality.

[0003] Patent CN 11076524A discloses a static devolatilizer, comprising an upper phase separation chamber and a bottom distributor subunit, performing two-step devolatilization to increase the phase interface area and prolong the residence time during the devolatilization process. However, due to the inability to rapidly renew the surface in the static devolatilizer, it cannot handle polymer systems with high viscosity and low volatile matter concentration. The residual volatile matter concentration of the polymer / volatile matter system treated by the static devolatilizer of this invention is as high as several thousand ppm, exceeding the requirements for residual volatile matter concentration in most application fields. Patents EP 2168743 and US 2020 / 0215738 disclose twin-screw extruder devolatilizers by setting a kneading section, using kneading elements to apply shearing action to the polymer melt, splitting the melt bundle in the screw channel, generating the mass transfer interface area required for devolatilization, and promoting surface renewal. However, high shear stress can lead to polymer degradation and color changes, affecting the quality of polymer products and limiting their application areas. Meanwhile, the limited mass transfer interface and surface renewal it generates severely restrict the devolatilization effect of the devolatilizer in twin-screw extruders. Utility Model Content

[0004] The purpose of this invention is to provide a continuous twin-screw dynamic devourer with forced diversion, which solves one or more of the above-mentioned problems in the prior art.

[0005] In a first aspect, this utility model provides a continuous twin-screw dynamic devourer with forced flow diversion, comprising:

[0006] The rear exhaust section is located at the end of the devourer;

[0007] The feed section is connected to the rear exhaust section;

[0008] The first-stage stripping section is connected to the other end of the feeding section;

[0009] The first-stage devolatilization section is connected to the other end of the first-stage stripping section;

[0010] The second-stage stripping section is connected to the other end of the first-stage devouring section;

[0011] The second-stage devolatilization section is connected to the other end of the second-stage stripping section;

[0012] The third-stage stripping section is connected to the other end of the second-stage devouring section;

[0013] The third-stage devolatilization section is connected to the other end of the third-stage stripping section;

[0014] A conveying / mixing section is located at the front end of the devolatilizer, and the conveying / mixing section is connected to the other end of the third-stage devolatilizer section.

[0015] Secondly, the present invention provides a continuous twin-screw dynamic devourer with forced flow diversion, characterized in that it comprises:

[0016] The feed section is located at the end of the devourer;

[0017] The first-stage stripping section is connected to the other end of the feeding section;

[0018] The first-stage devolatilization section is connected to the other end of the first-stage stripping section;

[0019] The second-stage stripping section is connected to the other end of the first-stage devouring section;

[0020] The second-stage devolatilization section is connected to the other end of the second-stage stripping section;

[0021] The third-stage stripping section is connected to the other end of the second-stage devouring section;

[0022] The third-stage devolatilization section is connected to the other end of the third-stage stripping section;

[0023] A conveying / mixing section is located at the front end of the devolatilizer, and the conveying / mixing section is connected to the other end of the third-stage devolatilizer section.

[0024] Thirdly, this utility model provides a continuous twin-screw dynamic devourer with forced diversion, comprising:

[0025] The rear exhaust section is located at the end of the devourer;

[0026] The feed section is connected to the rear exhaust section;

[0027] The first-stage stripping section is connected to the other end of the feeding section;

[0028] The first-stage devolatilization section is connected to the other end of the first-stage stripping section;

[0029] The second-stage stripping section is connected to the other end of the first-stage devouring section;

[0030] The second-stage devolatilization section is connected to the other end of the second-stage stripping section; a conveying / mixing section is located at the front end of the devolatilizer and is connected to the other end of the second-stage devolatilization section.

[0031] In some embodiments, the length L2 of the feed section is 3-12D, preferably 6-8D; the screw at the feed port position is a large-lead threaded element with a lead of 0.5-3D, preferably 0.6-2D, and more preferably 1.2-2D.

[0032] In some embodiments, the length L1 of the rear exhaust section is 3-12D, preferably 4-8D; and the lead of the threaded element gradually decreases from the feed section to the rear exhaust section; the lead of the threaded element in the rear exhaust section is 0.4-2.5D, preferably 0.5-1.5D, and more preferably 0.6-1.2D.

[0033] In some embodiments, the length of the first stripping section is 1-6D, preferably 1.5-2.5D; the length of the second stripping section is 1-6D, preferably 1.5-2.5D; and the length of the third stripping section is 1-6D, preferably 1.5-2.5D.

[0034] In some embodiments, the length of the first-stage stripping section is 1-6D, preferably 1.5-2.5D; the length of the second-stage stripping section is 1-6D, preferably 1.5-2.5D.

[0035] In some embodiments, the screw of the stripping section is provided with a mixing element, which includes a ZME thread element and a toothed disc element; the end of the stripping section is provided with a reverse thread element.

[0036] In some embodiments, a forced diversion zone consisting of a diversion ring and its pressure block is provided in the devolatilization section housing, wherein the length of the forced diversion zone is 2-8D, preferably 3-6D;

[0037] The flow divider ring includes, but is not limited to, slit type and porous type. The slit width of the slit type flow divider ring is 0.1-10 mm, preferably 1-5 mm, more preferably 3-5 mm; the slit length is 5-100 mm, preferably 10-60 mm; the slit spacing is 1-20 mm, preferably 2-10 mm, more preferably 3-5 mm; the entrance of the slit is chamfered to avoid dead zones on the outer surface of the flow divider ring; the slits are aligned or staggered in the axial direction; the slits can be distributed in a straight line or a spiral in the axial direction.

[0038] The perforated flow divider ring has a diameter of 0.1-10 mm, preferably 1-6 mm, and more preferably 3-5 mm; the radial hole spacing is 1-10 mm, preferably 2-5 mm; the axial hole spacing is 1-10 mm, preferably 3-6 mm; the inlet of the hole is chamfered; the perforations can be distributed in a straight line or a spiral in the axial direction.

[0039] In some embodiments, the screws at the forced diversion zone and exhaust zone of the devolatilization section are made of large-lead threaded elements, with a thread lead of 1-4D, preferably 1-3D, more preferably 1.5-2.5D; and a devolatilization section length of 4-12D, preferably 6-12D.

[0040] The beneficial effects of this utility model are:

[0041] 1. A continuous twin-screw dynamic devolatilizer is used to devolatilize polymer solution raw materials with a volatile concentration of 5-30% to a volatile concentration of 10-100ppm;

[0042] 2. By designing a novel housing and screw structure for the continuous twin-screw dynamic devolatilizer and employing a novel forced diversion technology, the devolatilization interface area and surface renewal rate of the continuous twin-screw dynamic devolatilizer are significantly improved, thereby enhancing the dynamic devolatilization effect;

[0043] 3. This continuous twin-screw dynamic devolatilizer does not contain any high-shear threaded elements such as kneading blocks, effectively avoiding the reduction of polymer molecular weight and color change caused by high shear. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the continuous twin-screw dynamic devourer with forced flow diversion in Example 1;

[0045] Figure 2 This is a schematic diagram of the structure of the continuous twin-screw dynamic devourer with forced flow diversion in Example 2;

[0046] Figure 3 This is a schematic diagram of the structure of the continuous twin-screw dynamic devourer with forced flow diversion in Example 3;

[0047] Figure 4This is a schematic diagram of the screw configuration in the stripping section;

[0048] Figure 5 This is a schematic diagram of the devolatilization section shell structure;

[0049] Figure 6 This is a schematic diagram of a slit-type flow divider ring;

[0050] Figure 7 This is a schematic diagram of a porous flow divider ring. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0052] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0053] like Figure 1 As shown, a continuous twin-screw dynamic devourer with forced flow diversion includes:

[0054] The rear exhaust section 1 is located at the end of the devourer;

[0055] Feed section 2 connected to the rear exhaust section 1;

[0056] The first stripping section 3 is connected to the other end of the feeding section 2;

[0057] The first-stage devolatilization section 4 is connected to the other end of the first-stage stripping section 3;

[0058] The second-stage stripping section 5 is connected to the other end of the first-stage devouring section 4;

[0059] The second-stage devolatilization section 6 is connected to the other end of the second-stage stripping section 5;

[0060] The third-stage stripping section 7 is connected to the other end of the second-stage devouring section 6;

[0061] The third-stage devolatilization section 8 is connected to the other end of the third-stage stripping section 7;

[0062] The conveying / mixing section 9 is located at the front end of the devolatilizer and is connected to the other end of the third devolatilizer section 8.

[0063] like Figure 2 The image shows a continuous twin-screw dynamic devourer with forced flow diversion, comprising:

[0064] Feed section 2 is located at the end of the devourer;

[0065] The first stripping section 3 is connected to the other end of the feeding section 2;

[0066] The first-stage devolatilization section 4 is connected to the other end of the first-stage stripping section 3;

[0067] The second-stage stripping section 5 is connected to the other end of the first-stage devouring section 4;

[0068] The second-stage devolatilization section 6 is connected to the other end of the second-stage stripping section 5;

[0069] The third-stage stripping section 7 is connected to the other end of the second-stage devouring section 6;

[0070] The third-stage devolatilization section 8 is connected to the other end of the third-stage stripping section 7;

[0071] The conveying / mixing section 9 is located at the front end of the devolatilizer and is connected to the other end of the third devolatilizer section (8).

[0072] like Figure 3 The image shows a continuous twin-screw dynamic devourer with forced flow diversion, comprising:

[0073] The rear exhaust section 1 is located at the end of the devourer;

[0074] Feed section 2 connected to the rear exhaust section 1;

[0075] The first stripping section 3 is connected to the other end of the feeding section 2;

[0076] The first-stage devolatilization section 4 is connected to the other end of the first-stage stripping section 3;

[0077] The second-stage stripping section 5 is connected to the other end of the first-stage devouring section 4;

[0078] The second-stage devolatilization section 6 is connected to the other end of the second-stage stripping section 5;

[0079] The conveying / mixing section 9 is located at the front end of the devolatilizer and is connected to the other end of the second-stage devolatilizer section 6.

[0080] The raw material for the continuous twin-screw dynamic devolatilizer comes from a polymer solution containing volatiles in the polymerization reactor. The polymer solution includes devolatilized polymer and volatile small molecules, such as organic solvents, residual monomers, water, or reaction byproducts. The continuous twin-screw dynamic devolatilizer of this invention can handle solutions with a maximum concentration of 30 wt%. To obtain ideal product performance, a side-feed extruder can be installed downstream of the devolatilization section to add plastic additives (such as antioxidants, UV stabilizers, lubricants, antistatic agents, pigments, etc.) to the devolatilized polymer melt, where they are melt-blended with the devolatilized polymer melt at the end of the continuous twin-screw dynamic devolatilizer. The outlet end of the continuous twin-screw dynamic devolatilizer is connected to granulation equipment, such as string pelletizer or underwater pelletizer. One or more of the following can be connected between the continuous twin-screw dynamic devolatilizer and the granulation equipment: a screen changer, a melt pump, and a start-up valve.

[0081] In the specific devolatilization process, the number of stages (two or three stages) of post-venting devolatilization and pre-venting devolatilization are selected according to the devolatilization requirements. When the volatile concentration in the polymer solution entering the continuous twin-screw dynamic devolatilizer is high (5-30%) and still has flash evaporation potential, a post-venting stage is set up to discharge the volatiles, and the feed stage captures the concentrated polymer solution. When the volatile concentration in the polymer solution entering the continuous twin-screw dynamic devolatilizer is very low (≤5%), it can directly enter the downstream first-stage stripping stage and first-stage devolatilization stage through the feed stage. The feed stage length L2 is 3-12D (D is the screw diameter), preferably 6-8D. The screw at the feed inlet is a large-lead threaded element with a lead of approximately 0.5-3D, preferably 0.6-2D, and more preferably 1.2-2D. When the high-temperature, pressurized polymer solution enters the continuous twin-screw dynamic devolatilizer, foam grows violently at the feed location and immediately expands and fills all screw channels. The length L1 of the post-venting section is 3-12D, preferably 4-8D. From the feed section towards the post-venting section, the lead of the threaded element gradually decreases. The lead of the threaded element in the post-venting section is 0.4-2.5D, preferably 0.5-1.5D, more preferably 0.6-1.2D. The gradual decrease in the lead of the threaded element causes bubble bursting, and the pressure difference causes the volatile gases to separate and be discharged through the post-venting port. The viscous flow generated by the screw rotation sends the concentrated polymer solution downstream. The material entering the continuous twin-screw dynamic devolatilizer has a temperature higher than the boiling point of the volatiles and a pressure higher than the corresponding saturation pressure. The post-venting can be performed under normal or negative pressure conditions. The pressure in the post-venting section is 1-100 kPa (absolute pressure), preferably 10-50 kPa, more preferably 10-30 kPa.

[0082] After being concentrated by post-gas extraction, the polymer solution is compressed and pressurized in the feed section before entering the first-stage stripping section 3. The stripping agent is typically water, CO2, or N2, which effectively reduces the partial pressure of volatiles in the gas phase, increases the mass transfer driving force of devolatilization, and also generates bubbles, increasing the gas-liquid mass transfer area and enhancing the devolatilization process. The injection amount of stripping agent upstream of each devolatilization section is 0-5 wt% M (M is the polymer melt mass flow rate processed by the extruder, kg / hr), preferably 0.2-3 wt% M, more preferably 0.2-1.5 wt% M. The injection area of ​​the stripping agent is selected according to the devolatilization process requirements; it can be injected before the first to third devolatilization sections, or only before the last section or two devolatilization sections. The length of the stripping section is 1-6D, preferably 1.5-2.5D. After the stripping agent is injected, the rotating screw breaks it into a large number of small bubbles that are uniformly dispersed in the polymer. The screw in the stripping section is equipped with mixing elements, such as ZME thread elements and toothed disc elements. The end of the stripping section is equipped with a reverse thread element, such as... Figure 4 As shown.

[0083] Due to the obstruction of the reverse thread element, the material flowing out of the stripping section cannot flow downstream along the screw. Instead, it enters the forced diversion zone within the devolatilization section shell, where it is formed by the diversion ring and its pressure block. After flowing out through the diversion ring, it enters the screw groove of the screw. Figure 5 As shown. The flow divider ring forces the melt to flow separately, generating a large melt surface area and providing a gas-liquid interface for devolatilization. Furthermore, the interface generated by the forced flow divider is constantly renewed, significantly improving the devolatilization efficiency of the continuous twin-screw dynamic devolatilizer. The length of the forced flow divider zone is 2-8D, preferably 3-6D. Typical flow divider rings include, but are not limited to, slit-type and porous types, such as... Figure 6 and 7 As shown. The slit width of the slit-type diverter ring is 0.1-10 mm, preferably 1-5 mm, more preferably 3-5 mm. The slit length is 5-100 mm, preferably 10-60 mm. The slit spacing (including axial and radial) is 1-20 mm, preferably 2-10 mm, more preferably 3-5 mm. The slit entrance is chamfered to avoid dead zones on the outer surface of the diverter ring. The slits are aligned or staggered axially. The slits can be distributed in a straight line or a spiral in the axial direction. The orifice diameter of the porous diverter ring is 0.1-10 mm, preferably 1-6 mm, more preferably 3-5 mm. The radial orifice spacing is 1-10 mm, preferably 2-5 mm. The axial orifice spacing is 1-10 mm, preferably 3-6 mm. Similarly, the orifice entrance is chamfered. The orifices can be distributed in a straight line or a spiral in the axial direction.

[0084] The screws in the forced diversion zone and venting zone of the devolatilization section are composed of large-lead threaded elements with a lead of 1-4D, preferably 1-3D, and more preferably 1.5-2.5D. The length of the devolatilization section is 4-12D, preferably 6-12D. The pressure (absolute pressure) in the venting zone is 0.01-60 kPa, preferably 0.1-20 kPa, and more preferably 0.1-10 kPa. As the volatile content in the feed solution decreases, or as devolatilization proceeds, the operating pressure in the venting zone can be gradually reduced to improve the devolatilization efficiency.

[0085] The rotational speed of the continuous twin-screw dynamic devolatilizer is 40-400 rpm, preferably 60-300 rpm, and more preferably 100-200 rpm. The concentration of volatiles in the polymer melt devolatilized by the continuous twin-screw dynamic devolatilizer is 1-1000 ppm, which is determined by factors such as the concentration of volatiles in the raw material solution, the devolatilization technology, and the performance requirements of the target product. It is preferably 10-300 ppm, and more preferably 10-100 ppm.

[0086] The screw in the exhaust zone conveys and compresses the devolatilized polymer melt to build up pressure before it enters the next stage, the stripping section and the devolatilization section. The shell and screw configurations, as well as the process conditions, of each stage of the stripping and devolatilization section can be identical, or adjusted accordingly as devolatilization progresses and the volatile content in the polymer decreases. The material output from the final devolatilization stage can be conveyed and compressed by the screw and leave the continuous twin-screw dynamic devolatilizer directly; alternatively, it can be thoroughly mixed with processing aids from the side feed, such as antioxidants, UV stabilizers, lubricants, antistatic agents, and pigments, before leaving the continuous twin-screw dynamic devolatilizer.

[0087] Depending on the properties of the polymer being processed, such as rheological properties, and the varying volatile content in the feed solution entering the devolatilizer, the devolatilization efficiency of the devolatilization extruder can be adjusted by selecting different types and sizes of internal components in the splitting ring, thereby improving the operational flexibility of the continuous twin-screw dynamic devolatilizer. Compared to traditional continuous twin-screw dynamic devolatilizers, the post-venting section involved in this invention can significantly increase the volatile concentration in the polymer solution entering the continuous twin-screw dynamic devolatilizer, up to a maximum of 30 wt%. When the feed concentration entering the continuous twin-screw dynamic devolatilizer is low, the post-venting section may not be necessary. The selection of the number of devolatilization stages and the operating pressure of the pre- and post-venting zones requires comprehensive consideration of factors such as equipment and process costs and process stability. As the number of devolatilization stages increases and the venting zone pressure decreases, the devolatilization efficiency increases. Increasing the number of devolatilization stages increases equipment costs. Under specific operating conditions, decreasing the venting zone pressure increases process energy consumption and the risk of material overflow from the venting zone, compromising process stability. Furthermore, the novel continuous twin-screw dynamic devolatilizer of this invention significantly increases the devolatilization interface area and surface renewal rate by setting a forced diversion ring, thereby enhancing the dynamic devolatilization effect. Moreover, the entire continuous twin-screw dynamic devolatilizer does not contain any strong shearing threaded elements such as kneading blocks, effectively avoiding the reduction in polymer molecular weight and color changes caused by high shear.

[0088] In summary, the continuous twin-screw dynamic devourer with forced flow diversion provided by this utility model has the following advantages:

[0089] 1. A continuous twin-screw dynamic devolatilizer is used to devolatilize polymer solution raw materials with a volatile concentration of 5-30% to a volatile concentration of 10-100ppm;

[0090] 2. By designing a novel housing and screw structure for the continuous twin-screw dynamic devolatilizer and employing a novel forced diversion technology, the devolatilization interface area and surface renewal rate of the continuous twin-screw dynamic devolatilizer are significantly improved, thereby enhancing the dynamic devolatilization effect;

[0091] 3. This continuous twin-screw dynamic devolatilizer does not contain any high-shear threaded elements such as kneading blocks, effectively avoiding the reduction of polymer molecular weight and color change caused by high shear.

[0092] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A continuous twin-screw dynamic devourer with forced flow diversion, characterized in that, include: The rear exhaust section (1) is located at the end of the devourer. Feed section (2) connected to the rear exhaust section (1); The first-stage stripping section (3) is connected to the other end of the feeding section (2); The first-stage devolatilization section (4) is connected to the other end of the first-stage stripping section (3); The second-stage stripping section (5) is connected to the other end of the first-stage devouring section (4); The second-stage devolatilization section (6) is connected to the other end of the second-stage stripping section (5); The third-stage stripping section (7) is connected to the other end of the second-stage devouring section (6); The third-stage devolatilization section (8) is connected to the other end of the third-stage stripping section (7); The conveying / mixing section (9) is located at the front end of the devolatilizer and is connected to the other end of the third devolatilizer section (8); The end of the stripping section is equipped with a reverse thread element; the devouring section shell is equipped with a forced diversion zone consisting of a diversion ring and its pressure block; The screw in the stripping section is equipped with a mixing element, which includes a ZME thread element and a toothed disc element; the continuous twin-screw dynamic devourer does not have a kneading block.

2. A continuous twin-screw dynamic devourer with forced flow diversion, characterized in that, include: The feed section (2) is located at the end of the devourer; The first-stage stripping section (3) is connected to the other end of the feeding section (2); The first-stage devolatilization section (4) is connected to the other end of the first-stage stripping section (3); The second-stage stripping section (5) is connected to the other end of the first-stage devouring section (4); The second-stage devolatilization section (6) is connected to the other end of the second-stage stripping section (5); The third-stage stripping section (7) is connected to the other end of the second-stage devouring section (6); The third-stage devolatilization section (8) is connected to the other end of the third-stage stripping section (7); A conveying / mixing section (9) is provided at the front end of the devolatilizer, and the conveying / mixing section (9) is connected to the other end of the third devolatilizer section (8); The end of the stripping section is equipped with a reverse thread element; the devouring section shell is equipped with a forced diversion zone consisting of a diversion ring and its pressure block; The screw in the stripping section is equipped with a mixing element, which includes a ZME thread element and a toothed disc element; the continuous twin-screw dynamic devourer does not have a kneading block.

3. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 1 or 2, characterized in that, The length of the first-stage stripping section (3) is 1-6D; the length of the second-stage stripping section (5) is 1-6D; and the length of the third-stage stripping section (7) is 1-6D.

4. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 3, characterized in that, The length of the first stripping section (3) is 1.5-2.5D; the length of the second stripping section (5) is 1.5-2.5D; and the length of the third stripping section (7) is 1.5-2.5D.

5. A continuous twin-screw dynamic devourer with forced flow diversion, characterized in that, include: The rear exhaust section (1) is located at the end of the devourer. Feed section (2) connected to the rear exhaust section (1); The first-stage stripping section (3) is connected to the other end of the feeding section (2); The first-stage devolatilization section (4) is connected to the other end of the first-stage stripping section (3); The second-stage stripping section (5) is connected to the other end of the first-stage devouring section (4); The second-stage devolatilization section (6) is connected to the other end of the second-stage stripping section (5); A conveying / mixing section (9) is provided at the front end of the devolatilizer, and the conveying / mixing section (9) is connected to the other end of the second-stage devolatilizer section (6); The end of the stripping section is equipped with a reverse thread element; the devouring section shell is equipped with a forced diversion zone consisting of a diversion ring and its pressure block; The screw in the stripping section is equipped with a mixing element, which includes a ZME thread element and a toothed disc element; the continuous twin-screw dynamic devourer does not have a kneading block.

6. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 1, 2, or 5, characterized in that, The length L2 of the feed section (2) is 3-12D; the screw at the feed port position is a large lead threaded element with a lead of 0.5-3D.

7. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 6, characterized in that, The length L2 of the feed section (2) is 6-8D; the screw at the feed port position is a large lead threaded element with a lead of 0.6-2D.

8. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 6, characterized in that, The screw at the feed inlet is a large-lead threaded element with a lead of 1.2-2D.

9. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 1 or 5, characterized in that, The length L1 of the rear exhaust section (1) is 3-12D; and the lead of the threaded element gradually decreases from the feed section to the rear exhaust section (1); the lead of the threaded element in the rear exhaust section (1) is 0.4-2.5D.

10. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 9, characterized in that, The length L1 of the rear exhaust section (1) is 4-8D; the lead of the threaded element of the rear exhaust section (1) is 0.5-1.5D.

11. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 9, characterized in that, The lead of the threaded element in the rear exhaust section (1) is 0.6-1.2D.

12. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 5, characterized in that, The length of the first-stage stripping section (3) is 1-6D; the length of the second-stage stripping section (5) is 1-6D.

13. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 12, characterized in that, The length of the first-stage stripping section (3) is 1.5-2.5D; the length of the second-stage stripping section (5) is 1.5-2.5D.

14. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 1, 2, or 5, characterized in that, The length of the forced diversion zone is 2-8D; Diverter rings include, but are not limited to, slit type and porous type. The slit width of the slit type diverter ring is 0.1-10mm; the slit length is 5-100mm; the slit spacing is 1-20mm; the entrance of the slit is chamfered to avoid dead zones on the outer surface of the diverter ring; the slits are aligned or staggered in the axial direction; the slits can be distributed in a straight line or a spiral in the axial direction. The perforated flow divider ring has a diameter of 0.1-10mm; the radial hole spacing is 1-10mm; the axial hole spacing is 1-10mm; the inlet of the hole is chamfered; the perforations can be distributed in a straight line or a spiral in the axial direction.

15. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 14, characterized in that, The length of the forced diversion zone is 3-6D; Diverter rings include, but are not limited to, slit type and porous type. The slit width of the slit type diverter ring is 1-5mm; the slit length is 10-60mm; and the slit spacing is 2-10mm. The perforated flow divider ring has a diameter of 1-6 mm; the radial hole spacing is 2-5 mm; and the axial hole spacing is 3-6 mm.

16. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 14, characterized in that, Diverter rings include, but are not limited to, slit type and porous type. The slit width of the slit type diverter ring is 3-5mm; the slit spacing is 3-5mm. The aperture of the porous flow divider ring is 3-5mm.

17. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 1, 2, or 5, characterized in that, The screws in the forced diversion zone and exhaust zone of the devolatilization section are composed of large-lead threaded elements with a thread lead of 1-4D; the length of the devolatilization section is 4-12D.

18. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 17, characterized in that, The screws in the forced diversion zone and exhaust zone of the devolatilization section are composed of large-lead threaded elements with a thread lead of 1-3D; the length of the devolatilization section is 6-12D.

19. A continuous twin-screw dynamic devourer with forced flow diversion according to claim 17, characterized in that, The lead of the thread is 1.5-2.5D.

Images