Horizontal reaction kettle, horizontal reactor and solution devolatilization method

Abstract

The invention relates to the field of solution stirring devolatilization, and discloses a horizontal reaction kettle, a horizontal reactor and a solution devolatilization method. The horizontal reaction kettle comprises a kettle body, a central stirring shaft and a side stirring shaft, wherein the central stirring shaft and the side stirring shaft are parallel to each other, the central stirring shaft and the side stirring shaft are mounted in the kettle body in a circumferential rotation manner, and the side stirring shaft is positioned between the central stirring shaft and the inner wall of the kettle body; a central paddle is arranged on the central stirring shaft, a side shaft paddle is arranged on the side stirring shaft, and a wall surface paddle is arranged on the inner wall of the kettle body; wherein the central paddle, the side shaft paddle and the wall surface paddle are arranged to be capable of stirring, shearing, compressing and stretching liquid. Wherein even if the volume of the kettle body is increased, the central paddle, the side shaft paddle and the wall surface paddle can still perform high-frequency stirring, shearing, compression and stretching treatment on liquid, and the liquid mixing effect is relatively good.

Description

Technical Field

[0001] The invention relates to the field of solution stirring devolatilization, in particular to a horizontal reaction kettle, a horizontal reactor and a solution devolatilization method. Background Art

[0002] At present, horizontal double-shaft stirring equipment is usually used to stir high-viscosity polymer liquids. Horizontal double-shaft stirring equipment mixes liquids by rotating the double shafts. However, for the current horizontal double-shaft stirring equipment, as the diameter of the kettle increases, the proportion of the stirring range of the stirring blades decreases, and the mixing effect of the stirring blades on the solution is reduced.

[0003] Therefore, it is urgent to develop a new type of equipment in which the liquid mixing effect will not deteriorate after the kettle volume increases. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that the liquid mixing effect becomes worse after the kettle body volume increases.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a horizontal reactor, which includes a reactor body, a central stirring shaft and a side stirring shaft; wherein the central stirring shaft and the side stirring shaft are parallel to each other, and the central stirring shaft and the side stirring shaft are rotatably installed in the reactor body, and the side stirring shaft is located between the central stirring shaft and the inner wall of the reactor body; the central stirring shaft is provided with a central blade, the side stirring shaft is provided with a side shaft blade, and the inner wall of the reactor body is provided with a wall blade; wherein the central blade, the side shaft blade and the wall blade are configured to stir, shear, compress and stretch the liquid.

[0006] In some embodiments, the central blades are arranged in multiple rows along the circumference of the central stirring shaft; the side blades are arranged in multiple rows along the circumference of the central stirring shaft; and the wall blades are arranged in multiple rows along the circumference of the central stirring shaft. In some embodiments, the arrangement direction of each row of central blades is at a spiral angle of 0 to 10° with the axial direction of the central stirring shaft, and the adjacent rows of central blades are staggered; the arrangement direction of each row of side blades is at a spiral angle of 0 to 10° with the axial direction of the central stirring shaft, and the adjacent rows of side blades are staggered; each row of wall blades is at a spiral angle of 0 to 10° with the axial direction of the central stirring shaft, and the adjacent rows of wall blades are staggered.

[0007] In some embodiments, there are multiple side stirring shafts, and all the side stirring shafts are spaced apart and distributed around the central stirring shaft.

[0008] In some embodiments, the wall blades are distributed in multiple rows with equal spacing along the circumference of the central stirring shaft; the number of side stirring shafts is equal to the number of rows of wall blades and corresponds one to one, and the side stirring shaft and the corresponding row of wall blades are arranged at the same normal position.

[0009] In some embodiments, at least one of the following schemes is adopted: Scheme 1, the distance between the end of the wall blade and the outer wall of the side stirring shaft is 1 to 10 mm; Scheme 2, the distance between the end of the side shaft blade and the outer wall of the central stirring shaft is 1 to 10 mm; Scheme 3, the distance between the end of the side shaft blade and the inner wall of the kettle body is 1 to 10 mm; Scheme 4, the distance between the end of the central blade and the outer wall of the side stirring shaft is 1 to 10 mm; Scheme 5, the distance between the end of the side shaft blade and the end of the wall blade is 1 to 10 mm; Scheme 6, the distance between the end of the side shaft blade and the end of the central blade is 1 to 10 mm.

[0010] In some embodiments, the inner wall of the kettle is configured to be shaped to accommodate the sweeping range of the sideshaft paddle.

[0011] In some embodiments, the outside of the kettle is further provided with a first jacket for accommodating a heat transfer medium, the first jacket having a first inlet and a first outlet; the central stirring shaft is provided with a second jacket for accommodating a heat transfer medium, the second jacket having a second inlet and a second outlet.

[0012] Another aspect of the present invention provides a horizontal reactor, which comprises a driving mechanism and the horizontal reactor of any one of the above embodiments; the driving structure is located outside the reactor body and is used to drive the central stirring shaft and the side stirring shaft to rotate circumferentially.

[0013] On the other hand, the present invention also provides a solution devolatilization method, which adopts the horizontal reaction kettle of any of the above-mentioned embodiments, or the horizontal reactor of the above-mentioned embodiments; the solution devolatilization method comprises the following steps: S1, heating the kettle body and the central stirring shaft; S2, adding the preheated solution into the kettle body under negative pressure conditions; S3, rotating the central stirring shaft and the side stirring shaft so that the central blade, the side shaft blade and the wall blade stir and devolatilize the preheated solution; S4, discharging the preheated solution after stirring and devolatilizing, and extracting the devolatilizing gas.

[0014] In some embodiments, step S1 further comprises: heating the kettle body with a heat transfer medium having a temperature range of 120 to 200° C.; heating the central stirring shaft with a heat transfer medium having a temperature range of 120 to 200° C.

[0015] In some embodiments, when the preheating solution is applied to the kettle, the temperature range of the preheating solution is 100-160° C.; the filling coefficient range of the preheating solution in the kettle is 0.25-0.75; and the residence time of the preheating solution in the kettle is 10-30 min.

[0016] In some embodiments, the rotation speed of the central stirring shaft is inversely proportional to the number of side stirring shafts; the rotation speed of the central stirring shaft is inversely proportional to the number of central paddles; the rotation speed of the side stirring shaft is inversely proportional to the number of central paddles.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] The side stirring shaft including the side shaft paddle is arranged between the inner wall of the kettle body and the central stirring shaft, so that the range of the solution being stirred is expanded, and the solution between the inner wall of the kettle body and the central stirring shaft can be fully stirred. Moreover, when the central stirring shaft and the side stirring shaft rotate, the liquid can be sheared, compressed and stretched between the central paddle and the side shaft paddle, and between the side shaft paddle and the wall paddle, so that the liquid is fully mixed. Even if the volume of the kettle body increases, the central paddle, the side shaft paddle and the wall paddle can still stir, shear, compress and stretch the liquid at a high frequency, and the liquid mixing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of a reaction kettle in one embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of part A in FIG.

[0021] Figure 3 It is a three-dimensional schematic diagram of the distribution positions of the central blade, the side shaft blade and the wall blade in one embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the distribution of the central stirring shaft and the side stirring shaft in one embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of the inner wall of a reaction kettle in one embodiment of the present invention;

[0024] Figure 6 It is a schematic structural diagram of a horizontal reactor in one embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Reactor; 2. Central stirring shaft; 3. Side stirring shaft; 4. Central paddle; 5. Side shaft paddle; 6. Wall paddle; 7. Motor; 8. Reducer; 9. First coupling; 10. Gearbox; 11. Second coupling; 12. Feed inlet; 13. Discharge outlet; 14. Vacuum outlet; 15. First jacket; 16. First inlet; 17. First outlet; 18. Second jacket; 19. Second inlet; 20. Second outlet; 21. Base. DETAILED DESCRIPTION

[0027] like Figures 1 to 3As shown, the present invention provides a horizontal reactor, which includes a reactor body 1, a central stirring shaft 2 and a side stirring shaft 3; wherein the central stirring shaft 2 and the side stirring shaft 3 are parallel to each other, and the central stirring shaft 2 and the side stirring shaft 3 are rotatably installed in the reactor body 1, and the side stirring shaft 3 is located between the central stirring shaft 2 and the inner wall of the reactor body 1. A central paddle 4 is provided on the central stirring shaft 2, a side shaft paddle 5 is provided on the side stirring shaft 3, and a wall paddle 6 is provided on the inner wall of the reactor body 1; wherein the central paddle 4, the side shaft paddle 5 and the wall paddle 6 are configured to stir, shear, compress and stretch the liquid.

[0028] Specifically, both ends of the central stirring shaft 2 and the side stirring shaft 3 pass through the side walls of the opposite ends of the kettle body 1 and can rotate in the circumferential direction. The wall blade 6 remains stationary, the side shaft blade 5 rotates with the side stirring shaft 3, and the central blade 4 rotates with the central stirring shaft 2; and the side shaft blade 5 and the central blade 4 can stir the liquid during the rotation process, and the wall blade 6 can disturb the liquid. In the axial direction of the kettle body 1, the central stirring shaft 2 or the side stirring shaft 3, there is an overlapping part between the wall blade 6 and the side shaft blade 5, and there is an overlapping part between the side shaft blade 5 and the central blade 4. In the axial direction of the kettle body 1, the central stirring shaft 2 or the side stirring shaft 3, for the adjacent central blade 4 and the side shaft blade 5, there is a small spacing between the side of the central blade 4 facing the side shaft blade 5 and the side of the side shaft blade 5 facing the central blade 4, for example, the spacing range is 1 to 10 mm. In the axial direction of the kettle body 1, the central stirring shaft 2 or the side stirring shaft 3, for the adjacent wall blades 6 and the side shaft blades 5, there is a small spacing between the side of the wall blade 6 facing the side shaft blade 5 and the side of the side shaft blade 5 facing the wall blade 6, for example, the spacing range is 1 to 10 mm. Therefore, when the central blade 4 and the side shaft blade 5 are circumferentially close to each other during the rotation process, the central blade 4 and the side shaft blade 5 can shear and compress the liquid; when the central blade 4 and the side shaft blade 5 are circumferentially away from each other during the rotation process, the central blade 4 and the side shaft blade 5 can shear and stretch the liquid; when the side shaft blade 5 gradually approaches the wall blade 6 during the rotation process, the side shaft blade 5 and the wall blade 6 can shear and compress the liquid; when the side shaft blade 5 gradually moves away from the wall blade 6 during the rotation process, the side shaft blade 5 and the wall blade 6 can shear and stretch the liquid. In addition, in the radial direction of the kettle body 1, the central stirring shaft 2 or the side stirring shaft 3, there is also a small spacing between the end of the wall blade 6 and the outer wall of the side stirring shaft 3, between the end of the side shaft blade 5 and the outer wall of the central stirring shaft 2, between the end of the side shaft blade 5 and the inner wall of the kettle body 1, between the end of the central blade 4 and the outer wall of the side stirring shaft 3, between the end of the side shaft blade 5 and the end of the wall blade 6, and between the end of the side shaft blade 5 and the end of the central blade 4.

[0029] In this embodiment, the side stirring shaft 3 including the side shaft paddle 5 is arranged between the inner wall of the kettle body 1 and the central stirring shaft 2, so that the range of the solution being stirred is expanded, and the solution between the inner wall of the kettle body 1 and the central stirring shaft 2 can be fully stirred. Moreover, when the central stirring shaft 2 and the side stirring shaft 3 rotate, the liquid can be sheared, compressed and stretched between the central blade 4 and the side shaft paddle 5, and between the side shaft paddle 5 and the wall paddle 6, so that the liquid is fully mixed. Even if the volume of the kettle body 1 increases, the central blade 4, the side shaft paddle 5 and the wall paddle 6 can still stir, shear, compress and stretch the liquid at a high frequency, and the liquid mixing effect is better.

[0030] In some embodiments, however, the rotation directions of the side stirring shaft 3 and the central stirring shaft 2 may be the same or different, and the rotation speeds of the side stirring shaft 3 and the central stirring shaft 2 may be equal or differential, which is not limited by the present invention.

[0031] In some embodiments, the central blades 4 are distributed in multiple rows along the circumference of the central stirring shaft 2; the side shaft blades 5 are distributed in multiple rows along the circumference of the central stirring shaft 2; and the wall blades 6 are distributed in multiple rows along the circumference of the central stirring shaft 2.

[0032] Specifically, multiple rows of central blades 4 are arranged on the central blade 4, and two adjacent rows of central blades 4 are spaced apart along the circumference of the central stirring shaft 2; multiple rows of side shaft blades 5 are arranged on the side stirring shaft 3, and two adjacent rows of side stirring shafts 3 are spaced apart along the circumference of the central stirring shaft 2; multiple rows of wall blades 6 are arranged on the inner wall of the reactor 1, and two adjacent rows of wall blades 6 are spaced apart along the circumference of the central stirring shaft 2, thereby effectively expanding the stirring range. For example, along the circumference of the central stirring shaft 2, the central blades 4 have two rows, three rows or even more rows, and each row is provided with at least two spaced central blades 4; the side shaft blades 5 have two rows, three rows or even more rows, and each row is provided with at least two spaced side shaft blades 5; the wall blades 6 have two rows, three rows or even more rows, and each row is provided with at least two spaced wall blades 6. Therefore, when the number of various types of blades increases, during the rotation of the central stirring shaft 2 and / or the side stirring shaft 3, the frequency of shearing, compressing and stretching the liquid between the central blade 4 and the side shaft blade 5, and between the side shaft blade 5 and the wall blade 6 increases, which can improve the mixing effect of the liquid; of course, high-frequency treatment of the solution can also prevent the solution from adhering to the various components for a long time, thereby avoiding coking or crusting on the various components, and improving the cleaning effect. In addition, in a preferred embodiment, the volume of the central blade 4 is inversely proportional to the number of the central blade 4, and the number of the side shaft blade 5 is inversely proportional to the volume of the side shaft blade 5. In a preferred embodiment, the wall blade 6 and the side shaft blade 5 correspond one to one, and the corresponding wall blades 6 and side shaft blades 5 are staggered.

[0033] In some embodiments, the arrangement direction of each row of central blades 4 is at a helical angle of 0 to 10° with the axial direction of the central stirring shaft 2, and two adjacent rows of central blades 4 are arranged alternately; the arrangement direction of each row of side shaft blades 5 is at a helical angle of 0 to 10° with the axial direction of the central stirring shaft 2, and two adjacent rows of side shaft blades 5 are arranged alternately; each row of wall blades 6 is at a helical angle of 0 to 10° with the axial direction of the central stirring shaft 2, and two adjacent rows of wall blades 6 are arranged alternately. For example, the helical angle can be 1°, 5°, or 8°, etc. Of course, in some other embodiments, the helical angle may not be set.

[0034] Specifically, the arrangement form of the central blades 4 in each row forms a spiral angle, the arrangement form of the side shaft blades 5 in each row also forms a spiral angle, and the arrangement form of the wall blades 6 in each row forms a spiral angle, and the distribution forms of the three blades are similar to the form of spiral ribbons. When the central stirring shaft 2 and / or the side stirring shaft 3 rotate, the central blades 4 and / or the side shaft blades 5 will circumferentially stir and propel the solution, and at the same time, under the action of the liquid level difference, the solution is better mixed in the axial and radial positions.

[0035] In addition, in order to facilitate understanding of the staggered arrangement of two adjacent rows of center blades 4, this embodiment is described by way of example. For example, the center blades 4 of the first row and the second row are adjacent in the circumferential direction, the first center blade 4 of the second row of center blades 4 is located between the first center blade 4 and the second center blade 4 of the first row of center blades 4, the second center blade 4 of the second row of center blades 4 is located between the second center blade 4 and the third center blade 4 of the first row of center blades 4, and so on. The same is true for the wall blades 6 and the side shaft blades 5 distributed in multiple rows, which will not be described in detail in this embodiment.

[0036] In some embodiments, Figures 3 to 5 As shown, there are multiple side stirring shafts 3, i.e., two or more; and all the side stirring shafts 3 are spaced apart around the central stirring shaft 2, for example, three, six or eight side stirring shafts 3 are evenly arranged around the central stirring shaft 2.

[0037] Specifically, when there are more side stirring shafts 3, the stirring range of the side shaft blades 5 will also increase, which is beneficial to improving the liquid mixing effect. Of course, it is also possible to add a wall blade 6 corresponding to each side shaft blade 5 on the inner wall of the kettle body 1, and add a central blade 4 corresponding to each side shaft blade 5 on the central stirring shaft 2 to improve the liquid mixing effect and self-cleaning effect.

[0038] In some embodiments, Figures 3 to 5 As shown, the wall blades 6 are distributed in multiple rows with equal spacing along the circumference of the central stirring shaft 2; the number of side stirring shafts 3 is equal to the number of rows of wall blades 6 and corresponds one to one, and the side stirring shafts 3 and the corresponding row of wall blades 6 are arranged at the same normal position.

[0039] Specifically, the axis of the side stirring shaft 3, the end of the wall blade 6 facing the side stirring shaft 3, and the end of the wall blade 6 facing the inner wall of the kettle body 1 are located on the same straight line. With this arrangement, there is no redundancy in the number of the side stirring shafts 3 and the wall blades 6, which effectively controls the manufacturing cost. Moreover, the side stirring shaft 3 and the corresponding row of wall blades 6 are arranged at the same normal position, and the wall blades 6 and the side shaft blades 5 have the best fit, which can improve the shear, stretching and compression effects, thereby improving the liquid mixing effect and self-cleaning effect. Preferably, the number of the side stirring shafts 3 is 2 to 36, for example 10, 20, 30, etc., and the central stirring shaft 2 is located at the center of the kettle body 1.

[0040] In some embodiments, the side stirring shaft 3 can perform planetary rotation around the circumference of the cylinder, and the side shaft blade 5 rotates around the side stirring shaft 3. Through this arrangement, the scraping range of the side shaft blade 5 can be effectively increased, so that the solution is fully stirred.

[0041] In some embodiments, at least one of the following schemes is adopted: Scheme 1, the distance between the end of the wall blade 6 and the outer wall of the side stirring shaft 3 is 1 to 10 mm; Scheme 2, the distance between the end of the side shaft blade 5 and the outer wall of the central stirring shaft 2 is 1 to 10 mm; Scheme 3, the distance between the end of the side shaft blade 5 and the inner wall of the kettle body 1 is 1 to 10 mm; Scheme 4, the distance between the end of the central blade 4 and the outer wall of the side stirring shaft 3 is 1 to 10 mm; Scheme 5, the distance between the end of the side shaft blade 5 and the end of the wall blade 6 is 1 to 10 mm; Scheme 6, the distance between the end of the side shaft blade 5 and the end of the central blade 4 is 1 to 10 mm.

[0042] Specifically, the spacing between one end of the wall blade 6 close to the side stirring shaft 3 and the outer wall of the side stirring shaft 3 can be 1 to 10 mm. The spacing between one end of the side shaft blade 5 close to the center stirring shaft 2 and the outer wall of the center stirring shaft 2 can be 1 to 10 mm. The spacing between one end of the side shaft blade 5 close to the inner wall of the kettle body 1 and the inner wall of the kettle body 1 can be 1 to 10 mm. The spacing between one end of the center blade 4 close to the side stirring shaft 3 and the outer wall of the side stirring shaft 3 is 1 to 10 mm. The spacing between one end of the side shaft blade 5 close to the wall blade 6 and one end of the wall blade 6 close to the side shaft blade 5 can be 1 to 10 mm; the spacing between one end of the side shaft blade 5 close to the center blade 4 and one end of the center blade 4 close to the side shaft blade 5 can be 1 to 10 mm. For example, any spacing mentioned in this embodiment can be 2 mm, 5 mm or 10 mm, etc., and those skilled in the art can select according to needs.

[0043] In this embodiment, when the central stirring shaft 2 rotates, the central blade 4 will scrape the outer wall of the side stirring shaft 3 and the side shaft blade 5; when the side stirring shaft 3 rotates, the side shaft blade 5 will not only scrape the inner wall of the kettle body 1 and the material adhered to the central blade 4, but also scrape the wall blade 6 and the outer wall of the central stirring shaft 2. Therefore, a smaller spacing is set so that each component can quickly scrape off the adhered liquid during the rotation process, avoiding the formation of liquid coking or crusting on each component, thereby improving the self-cleaning efficiency. Of course, as the number of wall blades 6, side shaft blades 5 and center blades 4 increases, not only will the stirring range of each blade be further increased, but the self-cleaning effect will also be further improved, which is conducive to achieving full-area self-cleaning.

[0044] In some embodiments, Figure 5 As shown, the inner wall of the kettle body 1 is configured to have a shape that adapts to the scraping range of the side-shaft paddle 5 .

[0045] Specifically, during the rotation of the internal gear stirring shaft, based on the shape of the side shaft paddle 5, the scraping range of the side shaft paddle 5 may be in different planes. For example, the scraping range of a T-shaped side shaft paddle 5 may be a cylindrical side surface; for another example, the scraping range of a C-shaped side shaft paddle 5 may be a spherical surface; for another example, the scraping range of an M-shaped side shaft paddle 5 may be a wavy surface. Setting the inner wall of the kettle body 1 to a shape that adapts to the scraping range of the side shaft paddle 5, such as a curved surface, a spherical surface, or a wavy surface, can avoid the formation of a stirring dead angle inside, improve the scraping efficiency of the side shaft paddle 5, and enhance the self-cleaning effect.

[0046] In some embodiments, the shapes of the wall blades 6, the side shaft blades 5 and the center blades 4 can be C-shaped, E-shaped, T-shaped, U-shaped, L-shaped, etc., and the present invention is not limited thereto as long as it is conducive to achieving the beneficial effects of the present invention.

[0047] In some embodiments, a scraping space for the side shaft paddle 5 to pass through is formed between two axially adjacent wall blades 6, and the side shaft paddle 5 can pass through the scraping space, and the three of them form shear, extrusion and stretching on the liquid. A scraping space for the wall paddle 6 to pass through is formed between two axially adjacent side shaft paddles 5, and the wall paddle 6 can pass through the scraping space, and the three of them form shear, extrusion and stretching on the liquid. A scraping space for the center paddle 4 to pass through is formed between axially adjacent side shaft paddles 5, and the center paddle 4 can pass through the scraping space, and the three of them form shear, extrusion and stretching on the liquid. A scraping space for the side shaft paddle 5 to pass through is formed between axially adjacent center paddles 4, and the side shaft paddle 5 can pass through the scraping space, and the three of them form shear, extrusion and stretching on the liquid.

[0048] In other embodiments, a scraping space for the side shaft blade 5 to pass through is formed between two axially adjacent wall blades 6, and the side shaft blade 5 can pass through the scraping space, and the three form shearing, squeezing and stretching on the liquid. A scraping space for the wall blade 6 to pass through is formed between two axially adjacent side shaft blades 5, and the wall blade 6 can pass through the scraping space, and the three form shearing, squeezing and stretching on the liquid. Like the meshing of gears, the center blade 4 and the side shaft blade 5 can also be set to an "alternating meshing" structure that can rotate alternately, and the center blade 4 and the side shaft blade 5 can continuously shear, stretch and compress the solution during the rotation process. In some embodiments, a base 21 is also provided at the bottom of the kettle body 1. Seals are provided at both ends of the rotating axial direction of the kettle body 1 to seal the rotating connection between the central stirring shaft 2 and the kettle body 1, and to seal the rotating connection between the side stirring shaft 3 and the kettle body 1.

[0049] In some embodiments, Figure 1 As shown, the outside of the kettle body 1 is also provided with a first jacket 15 for accommodating a heat transfer medium, and the first jacket 15 is provided with a first inlet 16 and a first outlet 17; the central stirring shaft 2 is provided with a second jacket 18 for accommodating a heat transfer medium, and the second jacket 18 is provided with a second inlet 19 and a second outlet 20.

[0050] Specifically, the first outlet 17 of the first jacket 15 is arranged at the upper part of the kettle body 1. The second inlet 19 and the second outlet 20 of the second jacket 18 are both arranged at one end of the central stirring shaft 2 extending out of the kettle body 1, and a rotary joint is also provided at the second inlet 19. The heat transfer medium with a temperature range of 120 to 200°C can flow along the first inlet 16, the first jacket 15 and the first outlet 17 to heat the kettle body 1; the heat transfer medium with a temperature range of 120 to 200°C can flow along the second inlet 19, the second jacket 18 and the second outlet 20 to heat the central stirring shaft 2. It should be noted that these components and their installation methods are common technical means in the field, and the present invention will not be described in detail.

[0051] In some embodiments, the feed port 12 of the kettle body 1 is arranged at the upper part of the kettle body 1, and can be used to apply the preheating solution; the discharge port 13 of the kettle body 1 is arranged at the lower part of the kettle body 1, and can be used to discharge the preheating solution after the devolatilization; the exhaust port 14 is arranged at the upper part of the kettle body 1, and can be used to extract the devolatilization gas. These components and their installation methods are common technical means in the field, and the present invention will not be described in detail.

[0052] like Figure 6 As shown, the present invention also provides a horizontal reactor, which includes a driving mechanism and the horizontal reactor in any of the above embodiments. The driving mechanism is located outside the reactor body 1 and is used to drive the central stirring shaft 2 and the side stirring shaft 3 to rotate circumferentially.

[0053] In this embodiment, the horizontal reactor adopts the horizontal reaction kettle of the above embodiment, which can also solve the problem that the liquid mixing effect becomes worse after the kettle body volume increases. The present invention will not elaborate on its principles and processes.

[0054] In addition, the driving mechanism is a common device in the art that can achieve the technical effects of the present invention. For example, the driving mechanism includes a motor 7, a reducer 8, a first coupling 9, a gear box 10 and a second coupling 11 connected in sequence. And the central stirring shaft 2 and the side stirring shaft 3 are both connected to the second coupling 11. The driving mechanism can drive the central stirring shaft 2 and the side stirring shaft 3 to rotate at the same speed or at a differential speed, and can also drive the central stirring shaft 2 and the side stirring shaft 3 to rotate in the same direction or in the opposite direction. It should be noted that the connection methods between the above-mentioned components are all common connection methods in the art, and the present invention will not be repeated here.

[0055] The present invention also provides a solution devolatilization method, which uses the horizontal reaction kettle in any of the above embodiments, or the horizontal reactor in the above embodiments. The solution devolatilization method comprises the following steps: S1, heating the kettle body 1 and the central stirring shaft 2; S2, adding the preheated solution into the kettle body 1 under negative pressure conditions; S3, rotating the central stirring shaft 2 and the side stirring shaft 3, so that the central blade 4, the side shaft blade 5 and the wall blade 6 stir and devolatilize the preheated solution; S4, discharging the preheated solution after stirring and devolatilizing, and extracting the devolatilization gas.

[0056] Specifically, since the side stirring shaft 3 including the side shaft blade 5 is arranged between the inner wall of the kettle body 1 and the central stirring shaft 2, after the preheating solution enters the kettle body 1, the preheating solution is subjected to stirring, shearing, compression and stretching treatment, and the liquid is fully mixed. Moreover, when the side stirring shaft 3 rotates, the side shaft blade 5 will scrape the wall blade 6, the inner wall of the kettle body 1, the outer wall of the central stirring shaft 2, and the central blade 4; when the central stirring shaft 2 rotates, the central blade 4 will scrape the outer wall of the side stirring shaft 3 and the side shaft blade 5, and the materials adhered to the surface of each component are quickly scraped off, avoiding coking or skinning, and improving the self-cleaning effect. In addition, in the process of continuous stirring, shearing, stretching and compression, the preheating solution will have better film-forming properties and a faster surface renewal rate, which is conducive to removing monomer impurities in the solution. In some embodiments, the preheating solution can be a styrene thermoplastic elastomer solution, and the residual monomer rate of the product discharged from the discharge port 13 after devolatilization is less than 1000ppm.

[0057] In some embodiments, step S1 further comprises: heating the kettle body 1 with a heat transfer medium having a temperature range of 120 to 200° C.; heating the central stirring shaft 2 with a heat transfer medium having a temperature range of 120 to 200° C.

[0058] Specifically, the temperature range of the heat transfer medium is 120-200°C, which is also helpful for the monomer impurities to precipitate as soon as possible and avoid coking or crusting due to cooling. Preferably, the heat transfer medium can be hot water, heat transfer oil, etc. Moreover, the vacuum pressure range of the negative pressure condition is preferably 10-20KPa, which helps to speed up the devolatilization efficiency. The temperature of the heat transfer medium can continuously heat the kettle body 1 and the central stirring shaft 2 to ensure that the entire kettle body 1 is in a constant temperature environment and avoid excessively high or low local temperatures. Of course, the kettle body 1 and the central stirring shaft 2 can also be heated by electric heating, and the present invention is not limited to this.

[0059] In some embodiments, the temperature range of the preheating solution is 100-160°C, which helps the monomer impurities to precipitate as soon as possible and avoids coking or crusting due to cooling. The filling coefficient range of the preheating solution in the kettle body 1 is 0.25-0.75, so that the entire horizontal kettle body 1 is in a better working state. The residence time of the preheating solution in the kettle body 1 is 10-30 minutes to ensure that the preheating solution can be fully devolatilized. The rotation speed range of the side stirring shaft 3 and the central stirring shaft 2 is 0-120rpm. Within this speed range, the devolatilization effect of the horizontal kettle body 1 is better and the energy consumption is lower.

[0060] In some embodiments, the rotation speed of the central stirring shaft 2 is inversely proportional to the number of side stirring shafts 3 ; the rotation speed of the central stirring shaft 2 is inversely proportional to the number of central paddles 4 ; the rotation speed of the side stirring shaft 3 is inversely proportional to the number of central paddles 4 .

[0061] Specifically, although the number of side stirring shafts 3 is small, the rotation speed of the central stirring shaft 2 is high, and the solution can still be processed at high frequency to improve the mixing effect of the solution. Similarly, when the number of central paddles 4 is small, the rotation speed of the central stirring shaft 2 is high, and the solution can still be processed at high frequency to improve the mixing effect of the solution. The number of central paddles 4 is small, and the rotation speed of the side stirring shaft 3 is high, and the solution can still be processed at high frequency to improve the mixing effect of the solution. On the contrary, if the rotation speed of each shaft is low, but the number of each blade is large, the solution can still be processed at high frequency to improve the mixing effect of the solution, and this embodiment will not be repeated.

[0062] The solution devolatilization method of the present invention is described in detail below in conjunction with a specific embodiment. The inner diameter of the kettle body 1 is 1.0m and the length is 2m. Eight rows of wall blades 6 are evenly arranged circumferentially on the inner wall of the kettle body 1, and each row has 20 wall blades 6. Eight side stirring shafts 3 are provided, and four rows of side shaft blades 5 are evenly arranged on the circumference of each side stirring shaft 3, and each row has 20 side shaft blades 5. Eight rows of center blades 4 are evenly arranged on the circumference of the center blade 4, and each row has 20 center blades 4. The distance between the wall blade 6 and the side stirring shaft 3, between the side shaft blade 5 and the center stirring shaft 2, between the side shaft blade 5 and the wall, between the center blade 4 and the side stirring shaft 3, between the side shaft blade 5 and the wall blade 6, and between the side shaft blade 5 and the center blade 4 is 5mm. Under the negative pressure of 15KPa, the styrene thermoplastic elastomer solution preheated to 120°C enters the kettle body 1 from the feed port 12 at a flow rate of 3000kg / h. The heat transfer medium uses 130°C heat transfer oil. Under the action of gravity, the preheated solution flows downward to the side shaft blade 5 and the side stirring shaft 3. Through the rotation of the side shaft blade 5 and the center blade 4, the preheated solution is subjected to compression, shearing and stretching. The rotation speed of the side stirring shaft 3 is 80rpm, and the rotation speed of the center stirring shaft 2 is 40rpm. At the same time, under the rotation of the center blade 4 and the side shaft blade 5, the preheated solution is well mixed in the radial and axial positions, and the axial propulsion of the preheated solution is achieved under the action of the liquid level difference and the helix angle. The filling coefficient range of the preheated solution in the kettle body 1 is 0.5, and the residence time in the kettle body 1 is 20min. The residual monomer content in the preheated solution after devolatilization and removal of impurities is 500ppm. The preheated solution after devolatilization flows out from the lower discharge port 13 , and the devolatilization gas is extracted from the upper exhaust port 14 .

[0063] In addition, based on the above specific embodiments, when the number of rows of wall blades 6, the gap distance between each blade, the vacuum pressure, the temperature of the heat transfer medium, the rotation speed of the side stirring shaft 3, the filling coefficient and the residence time of the preheating solution are changed, the change in the residual monomer content is shown in the following table.

[0064]

[0065] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. Including the various specific technical features combined in any appropriate manner. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A horizontal reactor, characterized in that: The kettle comprises a kettle body (1), a central stirring shaft (2) and a side stirring shaft (3); wherein the central stirring shaft (2) and the side stirring shaft (3) are parallel to each other, the central stirring shaft (2) and the side stirring shaft (3) are rotatably mounted in the kettle body (1), and the side stirring shaft (3) is located between the central stirring shaft (2) and the inner wall of the kettle body (1); The central stirring shaft (2) is provided with a central blade (4), the side stirring shaft (3) is provided with a side shaft blade (5), and the inner wall of the kettle body (1) is provided with a wall blade (6); wherein the central blade (4), the side shaft blade (5) and the wall blade (6) are configured to stir, shear, compress and stretch the liquid.

2. The horizontal reactor according to claim 1, characterized in that: The central blades (4) are distributed in multiple rows at intervals along the circumference of the central stirring shaft (2); The side shaft blades (5) are distributed in multiple rows at intervals along the circumference of the central stirring shaft (2); The wall blades (6) are spaced apart and distributed in multiple rows along the circumference of the central stirring shaft (2).

3. The horizontal reactor according to claim 2, characterized in that: The arrangement direction of each row of the central blades (4) forms a helical angle of 0 to 10° with the axial direction of the central stirring shaft (2), and the central blades (4) of two adjacent rows are arranged in a staggered manner; The arrangement direction of each row of the side shaft blades (5) forms a helical angle of 0 to 10° with the axial direction of the central stirring shaft (2), and the side shaft blades (5) of two adjacent rows are arranged in a staggered manner; Each row of the wall blades (6) forms a helical angle of 0 to 10° with the axial direction of the central stirring shaft (2), and two adjacent rows of the wall blades (6) are arranged in a staggered manner.

4. The horizontal reactor according to claim 1, characterized in that: The number of the side stirring shafts (3) is plural, and all the side stirring shafts (3) are distributed at intervals around the central stirring shaft (2).

5. The horizontal reactor according to claim 4, characterized in that: The wall blades (6) are distributed in multiple rows at equal intervals along the circumference of the central stirring shaft (2); The number of the side stirring shafts (3) is equal to the number of rows of the wall blades (6) and corresponds one to one, and the side stirring shaft (3) and the corresponding row of the wall blades (6) are arranged at the same normal position.

6. The horizontal reactor according to any one of claims 1 to 5, characterized in that: Use at least one of the following options: Solution 1: The distance between the end of the wall blade (6) and the outer wall of the side stirring shaft (3) is 1 to 10 mm; Solution 2: The distance between the end of the side shaft blade (5) and the outer wall of the central stirring shaft (2) is 1 to 10 mm; Solution 3: The distance between the end of the side shaft blade (5) and the inner wall of the kettle body (1) is 1 to 10 mm; Solution 4: The distance between the end of the central blade (4) and the outer wall of the side stirring shaft (3) is 1 to 10 mm; Solution 5: The distance between the end of the side shaft blade (5) and the end of the wall blade (6) is 1 to 10 mm; Solution 6: The distance between the end of the side shaft blade (5) and the end of the central blade (4) is 1 to 10 mm.

7. The horizontal reactor according to claim 1, characterized in that: The inner wall of the kettle body (1) is configured to have a shape that is adapted to the scraping range of the side shaft blade (5).

8. The horizontal reactor according to claim 1, characterized in that: The kettle body (1) is also provided with a first jacket (15) for accommodating a heat transfer medium on the outside, the first jacket (15) being provided with a first inlet (16) and a first outlet (17); the central stirring shaft (2) is provided with a second jacket (18) for accommodating a heat transfer medium, the second jacket (18) being provided with a second inlet (19) and a second outlet (20).

9. A horizontal reactor, characterized in that: It comprises a driving mechanism and a horizontal reactor as claimed in any one of claims 1 to 8; the driving structure is located outside the reactor body (1) and is used to drive the central stirring shaft (2) and the side stirring shaft (3) to rotate circumferentially.

10. A solution devolatilization method, characterized in that: A horizontal reactor as claimed in any one of claims 1 to 8, or a horizontal reactor as claimed in claim 9; The solution devolatilization method comprises the following steps: S1, heating the kettle body (1) and the central stirring shaft (2); S2. Adding the preheated solution into the kettle (1) under negative pressure; S3, rotating the central stirring shaft (2) and the side stirring shaft (3) so that the central blade (4), the side shaft blade (5) and the wall blade (6) stir and devolatilize the preheated solution; S4, discharging the preheated solution after stirring and devolatilization, and extracting the devolatilization gas.

11. The solution devolatilization method according to claim 10, characterized in that: The step S1 further comprises: The kettle (1) is heated by a heat transfer medium having a temperature range of 120 to 200° C.; The central stirring shaft (2) is heated by a heat transfer medium having a temperature range of 120 to 200°C.

12. The solution devolatilization method according to claim 10, characterized in that: When the preheating solution is applied to the kettle (1), the temperature range of the preheating solution is 100 to 160° C.; the filling coefficient range of the preheating solution in the kettle (1) is 0.25 to 0.75; and the residence time of the preheating solution in the kettle (1) is 10 to 30 minutes.

13. The solution devolatilization method according to claim 10, characterized in that: The rotation speed of the central stirring shaft (2) is inversely proportional to the number of the side stirring shafts (3); the rotation speed of the central stirring shaft (2) is inversely proportional to the number of the central paddles (4); the rotation speed of the side stirring shaft (3) is inversely proportional to the number of the central paddles (4).

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