Horizontal double-shaft kneading reactor and process for producing super absorbent resin

Abstract

The invention relates to a horizontal double-shaft kneading reactor and process for production of super absorbent resin, and belongs to the technical field of production of super absorbent resin, the horizontal double-shaft kneading reactor comprises a mounting base, and a mounting vertical plate is fixedly mounted at the top of the mounting base. According to the horizontal double-shaft kneading reactor and process for producing the super absorbent resin, the micro-negative pressure device is arranged at the top of the tail section of the reaction tube, air is pumped outwards through the vacuum pump in the vacuum tank, micro-negative pressure is formed at the tail section of the reaction tube through the main air tube and the branch tubes, moisture volatilized in the tail section of the reaction tube is pumped out, and the moisture volatilization speed is increased; the problems that a large amount of heat is generated in the polymerization reaction of the super absorbent resin, the super absorbent resin needs to be cooled after the reaction is completed, the super absorbent resin with lower temperature is obtained, but the super absorbent resin with lower temperature needs to be heated and dried in the subsequent process, so that the reaction time is shortened are solved. The heat generated by the polymerization reaction is wasted.

Description

Technical Field

[0001] The invention relates to the technical field of super absorbent resin production, in particular to a horizontal double-shaft kneading reactor and a process for producing super absorbent resin. Background Art

[0002] Super absorbent resin is a typical functional polymer material. It is a functional polymer compound that is insoluble in water and has extremely high water absorption and has many hydrophilic functional groups and slight cross-linking. It can absorb and retain hundreds or even thousands of times its own weight in water or dozens of times in salt water. It is usually called "super absorbent polymer", "absorbent polymer material", "absorbent polymer resin" or "super absorbent".

[0003] Super absorbent resin has a unique body network structure, which gives it super strong water absorption capacity, fast water absorption speed, good water retention performance, etc. It is difficult to separate the absorbed water even under external pressure, and it has a certain elasticity. Therefore, it has been widely used in the field of sanitary products, accounting for the largest proportion of the total consumption, and the market consumption is still increasing year by year.

[0004] During the polymerization reaction of a super absorbent resin, a large amount of heat is generated. After the reaction is completed, the super absorbent resin needs to be cooled to obtain a super absorbent resin with a lower temperature. In the subsequent process, the super absorbent resin with a lower temperature needs to be heated and dried, resulting in waste of heat generated by the polymerization reaction. In view of this, the present application proposes a horizontal biaxial kneading reactor and process for the production of super absorbent resin. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a horizontal double-shaft kneading reactor and process for producing a super absorbent resin, which has the advantages of utilizing polymerization heat to volatilize a large amount of water, reducing the cost of subsequent drying, etc., and solves the problem that a large amount of heat is generated during the polymerization reaction of the super absorbent resin, and the super absorbent resin needs to be cooled after the reaction is completed to obtain a super absorbent resin with a lower temperature. However, in the subsequent process, the super absorbent resin with a lower temperature needs to be heated and dried, resulting in the problem that the heat generated by the polymerization reaction is wasted.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: A horizontal biaxial kneading reactor for producing a super absorbent resin, comprising a mounting base, a mounting vertical plate fixedly mounted on the top of the mounting base, a reaction tube fixedly mounted on one side of the mounting vertical plate, and a micro-negative pressure device fixedly mounted on the top of one end of the reaction tube away from the mounting vertical plate;

[0009] The micro-negative pressure device comprises a main air pipe fixedly installed on the top of the reaction tube, a vacuum tank fixedly installed on the top of the main air pipe, a vacuum pump fixedly installed on the inner side wall of the vacuum tank, and two branch pipes fixedly installed on the side of the main air pipe.

[0010] Furthermore, a refrigeration tube is fixedly installed inside the tube wall of the reaction tube away from the mounting plate, an input tube fixedly connected to the input end of the refrigeration tube is fixedly installed at the end of the reaction tube away from the mounting plate, and an output tube fixedly connected to the output end of the refrigeration tube is fixedly installed at the end of the reaction tube away from the mounting plate, and the output tube is connected to the input end of an external refrigerator.

[0011] Furthermore, a circulation pump is fixedly installed on the top of the mounting base, the output end of the circulation pump is connected to the input pipe, and a connecting pipe is fixedly installed on the output end of the circulation pump, and the connecting pipe is connected to the output end of the external refrigerator.

[0012] Furthermore, a feeding pipe is fixedly installed on the top of the reaction tube near one end of the mounting vertical plate, a mixing bucket is fixedly installed on the top of the feeding pipe, and two feeding ports are fixedly installed on the top of the mixing bucket.

[0013] Furthermore, a rotating shaft is rotatably mounted on the inner top wall of the mixing bucket, a mixing blade is fixedly mounted on the surface of the rotating shaft, an input screw is fixedly mounted on the bottom end of the rotating shaft, the input screw is located inside the feeding pipe, a mixing motor is fixedly mounted on the top of the mixing bucket, and an output shaft of the mixing motor is fixedly connected to the top end of the rotating shaft.

[0014] Furthermore, a reactant adding hopper is fixedly installed at the top in the middle of the reaction tube, and a discharge port is fixedly installed at one end of the reaction tube away from the mounting vertical plate.

[0015] Furthermore, two mutually meshing reaction screws are rotatably mounted on the inner side wall of the reaction tube, and a driven pulley fixedly connected to one end of the reaction screw is rotatably mounted on one side of the mounting vertical plate.

[0016] Furthermore, a double-layer pulley is rotatably installed on one side of the mounting plate, and the double-layer pulley is connected to two driven pulleys through a belt. A reaction motor with an output shaft fixedly connected to the double-layer pulley is fixedly installed on the other side of the mounting plate. A front end support plate is fixedly installed on the top of the mounting base, and the top of the front end support plate is fixedly connected to the bottom of the reaction tube.

[0017] Another technical problem to be solved by the present invention is to provide a production process of a super absorbent resin, comprising the following steps:

[0018] 1) Raw material preparation: various raw materials are selected according to a certain proportion, and various raw materials are put into the mixing bucket through two feeding ports. In the mixing bucket, the mixing motor drives the rotating shaft to rotate, driving the mixing blades to rotate, and the various raw materials are mixed, and then put into the interior of the reaction tube under the action of the input screw;

[0019] 2) Mixing and transmission: the reaction motor drives the double-layer pulley to rotate, drives the two driven pulleys to rotate, drives the two reaction screws to rotate, pushes the raw materials forward inside the reaction tube, and mixes the raw materials again;

[0020] 3) Polymerization reaction, adding sodium hydroxide solution in the middle section of the reaction tube through the reactant adding bucket to neutralize the raw materials with acid and alkali, the acid and alkali neutralization reaction generates heat, triggering the polymerization reaction of the raw materials to obtain a mixed material, and forming a slight negative pressure in the tail section of the reaction tube through a slight negative pressure device in the tail section of the reaction tube to accelerate the discharge of volatile water in the mixed material;

[0021] 4) Granulation and drying: granulating the mixture, and then drying the granular mixture to obtain highly absorbent resin particles;

[0022] 5) grinding and screening, grinding the super absorbent resin particles and screening to obtain super absorbent resin powder;

[0023] 6) Preparation for delivery: surface treatment of the super absorbent resin powder, mixing and packaging of the super absorbent resin powder, and storage of the packaged super absorbent resin powder product to complete the production of the super absorbent resin.

[0024] (III) Beneficial effects

[0025] Compared with the prior art, the present invention provides a horizontal double-shaft kneading reactor and process for producing a highly water-absorbent resin, which has the following beneficial effects:

[0026] 1. The horizontal double-shaft kneading reactor and process for producing super absorbent resin, by arranging a micro-negative pressure device at the top of the tail section of the reaction tube, exhausting air outwards through a vacuum pump, forming a micro-negative pressure at the tail section of the reaction tube through a main gas pipe and a branch pipe, extracting the volatilized water in the tail section of the reaction tube, and increasing the volatilization rate of the water, solves the problem that a large amount of heat is generated during the polymerization reaction of the super absorbent resin, and the super absorbent resin needs to be cooled after the reaction is completed to obtain a super absorbent resin with a lower temperature, but in the subsequent process, the super absorbent resin with a lower temperature needs to be heated and dried, resulting in the problem that the heat generated by the polymerization reaction is wasted.

[0027] 2. The horizontal double-shaft kneading reactor and process for producing super absorbent resin comprises the following steps: installing a refrigeration tube inside the side wall of the tail section of the reaction tube, passing cold water refrigerated in an external refrigerator into the refrigeration tube through a circulating pump, cooling the tail section of the reaction tube and the super absorbent resin, and cooperating with a micro-negative pressure device to drive the gas flow in the tail section of the reaction tube, accelerate the cooling process, and quickly cool the super absorbent resin, thereby preventing the occurrence of side reactions such as breakage of the gel network molecular chain or self-crosslinking. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A horizontal double-shaft kneading reactor for producing a highly water-absorbent resin and a schematic cross-sectional view of the process structure proposed by the present invention;

[0029] Figure 2 A schematic top view of a cross-sectional view of a horizontal double-shaft kneading reactor and a process reaction tube for producing a highly water-absorbent resin proposed by the present invention;

[0030] Figure 3 A schematic side cross-sectional view of a horizontal double-shaft kneading reactor and a process reaction tube for producing a highly water-absorbent resin proposed by the present invention;

[0031] Figure 4 The present invention provides a three-dimensional schematic diagram of a horizontal double-shaft kneading reactor for producing a highly water-absorbent resin and a tail section of a process reaction tube.

[0032] In the figure: 1. Installation base; 2. Installation vertical plate; 3. Reaction tube; 4. Micro-negative pressure device; 41. Main air pipe; 42. Vacuum tank; 43. Vacuum pump; 44. Branch pipe; 5. Refrigeration pipe; 6. Input pipe; 7. Output pipe; 8. Circulation pump; 81. Connecting pipe; 9. Feeding pipe; 10. Mixing bucket; 11. Feeding port; 12. Rotating shaft; 13. Mixing blades; 14. Input screw; 15. Mixing motor; 16. Reactant adding bucket; 17. Discharging port; 18. Reaction screw; 19. Driven pulley; 20. Double-layer pulley; 21. Reaction motor; 22. Front end support plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 4A horizontal double-shaft kneading reactor for producing highly absorbent resin comprises a mounting base 1, a mounting plate 2 is fixedly mounted on the top of the mounting base 1, a reaction tube 3 is fixedly mounted on one side of the mounting plate 2, and a micro-negative pressure device 4 is fixedly mounted on the top of one end of the reaction tube 3 away from the mounting plate 2.

[0035] The micro-negative pressure device 4 includes a main air pipe 41 fixedly mounted on the top of the reaction tube 3, a vacuum tank 42 fixedly mounted on the top of the main air pipe 41, a vacuum pump 43 fixedly mounted on the inner wall of the vacuum tank 42, and two branch pipes 44 fixedly mounted on the side of the main air pipe 41. The vacuum pump 43 is started to form a micro-negative pressure at the tail section of the main air pipe 41, accelerate the air flow inside the tail section of the main air pipe 41, and use the heat generated by the polymerization reaction to accelerate the volatilization of water in the tail section of the main air pipe 41, thereby reducing the subsequent drying cost.

[0036] At the same time, a refrigeration tube 5 is fixedly installed inside the tube wall of the reaction tube 3 away from the mounting plate 2, an input tube 6 fixedly connected to the input end of the refrigeration tube 5 is fixedly installed at the end of the reaction tube 3 away from the mounting plate 2, and an output tube 7 fixedly connected to the output end of the refrigeration tube 5 is fixedly installed at the end of the reaction tube 3 away from the mounting plate 2, and the output tube 7 is connected to the input end of an external refrigerator.

[0037] A circulating pump 8 is fixedly installed on the top of the mounting base 1, and the output end of the circulating pump 8 is connected to the input pipe 6. A connecting pipe 81 is fixedly installed on the output end of the circulating pump 8, and the connecting pipe 81 is connected to the output end of the external refrigerator. The circulating pump 8 drives the cold water in the refrigerator to flow into the cooling pipe 5, and then flows back to the refrigerator to cool the highly absorbent resin inside the reaction tube 3.

[0038] Meanwhile, a feeding pipe 9 is fixedly installed on the top of the reaction tube 3 near one end of the mounting vertical plate 2 , a mixing bucket 10 is fixedly installed on the top of the feeding pipe 9 , and two feeding ports 11 are fixedly installed on the top of the mixing bucket 10 .

[0039] The inner top wall of the mixing bucket 10 is rotatably mounted with a rotating shaft 12, the surface of the rotating shaft 12 is fixedly mounted with a mixing blade 13, the bottom end of the rotating shaft 12 is fixedly mounted with an input screw 14, the input screw 14 is located inside the feeding pipe 9, and the top of the mixing bucket 10 is fixedly mounted with a mixing motor 15, the output shaft of the mixing motor 15 is fixedly connected to the top of the rotating shaft 12. Two groups of raw materials are put into the mixing bucket 10 through the feed port 11, the mixing motor 15 drives the rotating shaft 12 to rotate, drives the mixing blade 13 to mix the raw materials in the mixing bucket 10, and the rotating shaft 12 drives the input screw 14 to rotate, and the mixed raw materials are put into the reaction tube 3, so that the raw materials are mixed in the mixing bucket 10, and the length of the reaction tube 3 is reduced.

[0040] Meanwhile, a reactant adding hopper 16 is fixedly installed at the top in the middle of the reaction tube 3 , and a discharge port 17 is fixedly installed at one end of the reaction tube 3 away from the mounting vertical plate 2 .

[0041] The inner wall of the reaction tube 3 is rotatably mounted with two mutually meshing reaction screws 18, and one side of the mounting plate 2 is rotatably mounted with a driven pulley 19 fixedly connected to one end of the reaction screw 18. The reaction screw 18 is divided into three sections, the neutralization section below the feeding tube 9, the polymerization section below the reactant adding hopper 16, and the granulation section below the micro-negative pressure device 4.

[0042] Secondly, a double-layer pulley 20 is rotatably mounted on one side of the mounting plate 2, and the double-layer pulley 20 is connected to two driven pulleys 19 through a belt, and a reaction motor 21 whose output shaft is fixedly connected to the double-layer pulley 20 is fixedly mounted on the other side of the mounting plate 2, and a front end support plate 22 is fixedly mounted on the top of the mounting base 1, and the top of the front end support plate 22 is fixedly connected to the bottom of the reaction tube 3. The reaction motor 21 drives the double-layer pulley 20 to rotate, drives the two driven pulleys 19 to rotate, and drives the two reaction screws 18 to rotate.

[0043] Another technical problem to be solved by the present invention is to provide a production process of a super absorbent resin, comprising the following steps:

[0044] 1) Raw material preparation: various raw materials are selected according to a certain proportion, and various raw materials are put into the mixing bucket through two feeding ports. In the mixing bucket, the mixing motor drives the rotating shaft to rotate, driving the mixing blades to rotate, and the various raw materials are mixed, and then put into the interior of the reaction tube under the action of the input screw;

[0045] 2) Mixing and transmission: the reaction motor drives the double-layer pulley to rotate, drives the two driven pulleys to rotate, drives the two reaction screws to rotate, pushes the raw materials forward inside the reaction tube, and mixes the raw materials again;

[0046] 3) Polymerization reaction, adding sodium hydroxide solution in the middle section of the reaction tube through the reactant adding bucket to neutralize the raw materials with acid and alkali, the acid and alkali neutralization reaction generates heat, triggering the polymerization reaction of the raw materials to obtain a mixed material, and forming a slight negative pressure in the tail section of the reaction tube through a slight negative pressure device in the tail section of the reaction tube to accelerate the discharge of volatile water in the mixed material;

[0047] 4) Granulation and drying: granulating the mixture, and then drying the granular mixture to obtain highly absorbent resin particles;

[0048] 5) grinding and screening, grinding the super absorbent resin particles and screening to obtain super absorbent resin powder;

[0049] 6) Preparation for delivery: surface treatment of the super absorbent resin powder, mixing and packaging of the super absorbent resin powder, and storage of the packaged super absorbent resin powder product to complete the production of the super absorbent resin.

[0050] Working principle: two groups of raw materials are put into the mixing bucket 10 through the feed port 11, the mixing motor 15 drives the mixing blades 13 to mix the raw materials in the mixing bucket 10, the rotating shaft 12 drives the input screw 14 to rotate, and the mixed raw materials are put into the reaction tube 3, the reaction motor 21 drives the two reaction screws 18 to rotate, and the raw materials are transported forward, and sodium hydroxide solution is added from the reactant adding bucket 16 to neutralize the raw materials with acid and alkali. The acid-base neutralization reaction generates heat, which triggers the polymerization reaction of the raw materials to obtain a mixed material. At the tail section of the reaction tube 3, a micro-negative pressure is formed at the tail section of the reaction tube 3 by the micro-negative pressure device 4 to accelerate the discharge of volatile water in the mixed material.

[0051] In summary, the horizontal biaxial kneading reactor and process for producing super absorbent resin is provided with a micro-negative pressure device 4 at the tail section of the reaction tube 3, and the heat generated by the polymerization reaction is used to volatilize the water in the mixed reactants, and then the water is extracted through the micro-negative pressure device 4, so that the volatilization of the water in the mixed reactants is accelerated, thereby reducing the subsequent drying cost of the mixed reactants.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal biaxial kneading reactor for producing a super absorbent resin, comprising a mounting base (1), characterized in that: A mounting plate (2) is fixedly mounted on the top of the mounting base (1), a reaction tube (3) is fixedly mounted on one side of the mounting plate (2), and a micro-negative pressure device (4) is fixedly mounted on the top of one end of the reaction tube (3) away from the mounting plate (2); The micro-negative pressure device (4) comprises a main gas pipe (41) fixedly mounted on the top of the reaction tube (3); a vacuum tank (42) is fixedly mounted on the top of the main gas pipe (41); a vacuum pump (43) is fixedly mounted on the inner side wall of the vacuum tank (42); and two branch pipes (44) are fixedly mounted on the side of the main gas pipe (41).

2. The horizontal biaxial kneading reactor for producing a highly water-absorbent resin according to claim 1, characterized in that: A refrigeration tube (5) is fixedly mounted inside the tube wall of the reaction tube (3) at one end away from the mounting plate (2); an input tube (6) fixedly connected to the input end of the refrigeration tube (5) is fixedly mounted at the end of the reaction tube (3) away from the mounting plate (2); an output tube (7) fixedly connected to the output end of the refrigeration tube (5) is fixedly mounted at the end of the reaction tube (3) away from the mounting plate (2); and the output tube (7) is connected to the input end of an external refrigerator.

3. A horizontal biaxial kneading reactor for producing a highly water-absorbent resin according to claim 2, characterized in that: A circulating pump (8) is fixedly mounted on the top of the mounting base (1), the output end of the circulating pump (8) is connected to the input pipe (6), and a connecting pipe (81) is fixedly mounted on the output end of the circulating pump (8), and the connecting pipe (81) is connected to the output end of an external refrigerator.

4. The horizontal double-shaft kneading reactor for producing a highly water-absorbent resin according to claim 1, characterized in that: A feeding pipe (9) is fixedly mounted on the top of one end of the reaction tube (3) close to the mounting plate (2), a mixing bucket (10) is fixedly mounted on the top of the feeding pipe (9), and two feeding ports (11) are fixedly mounted on the top of the mixing bucket (10).

5. The horizontal biaxial kneading reactor for producing a highly water-absorbent resin according to claim 4, characterized in that: A rotating shaft (12) is rotatably mounted on the inner top wall of the mixing bucket (10), a mixing blade (13) is fixedly mounted on the surface of the rotating shaft (12), an input screw (14) is fixedly mounted on the bottom end of the rotating shaft (12), the input screw (14) is located inside the feeding pipe (9), a mixing motor (15) is fixedly mounted on the top of the mixing bucket (10), and an output shaft of the mixing motor (15) is fixedly connected to the top end of the rotating shaft (12).

6. The horizontal biaxial kneading reactor for producing a highly water-absorbent resin according to claim 1, characterized in that: A reactant adding hopper (16) is fixedly mounted on the top of the middle of the reaction tube (3), and a discharge port (17) is fixedly mounted on one end of the reaction tube (3) away from the mounting vertical plate (2).

7. The horizontal biaxial kneading reactor for producing a highly water-absorbent resin according to claim 1, characterized in that: Two mutually meshing reaction screws (18) are rotatably mounted on the inner side wall of the reaction tube (3), and a driven pulley (19) fixedly connected to one end of the reaction screw (18) is rotatably mounted on one side of the mounting plate (2).

8. The horizontal double-shaft kneading reactor for producing a highly water-absorbent resin according to claim 7, characterized in that: A double-layer pulley (20) is rotatably mounted on one side of the mounting plate (2), and the double-layer pulley (20) is transmission-connected to two driven pulleys (19) via a belt; a reaction motor (21) whose output shaft is fixedly connected to the double-layer pulley (20) is fixedly mounted on the other side of the mounting plate (2); a front end support plate (22) is fixedly mounted on the top of the mounting base (1), and the top of the front end support plate (22) is fixedly connected to the bottom of the reaction tube (3).

9. A process for producing a highly water-absorbent resin according to claim 1, characterized in that: The following steps are involved: 1) Raw material preparation: various raw materials are selected according to a certain proportion, and various raw materials are put into the mixing bucket through two feeding ports. In the mixing bucket, the mixing motor drives the rotating shaft to rotate, driving the mixing blades to rotate, and the various raw materials are mixed, and then put into the interior of the reaction tube under the action of the input screw; 2) Mixing and transmission: the reaction motor drives the double-layer pulley to rotate, drives the two driven pulleys to rotate, drives the two reaction screws to rotate, pushes the raw materials forward inside the reaction tube, and mixes the raw materials again; 3) Polymerization reaction, adding sodium hydroxide solution in the middle section of the reaction tube through the reactant adding bucket to neutralize the raw materials with acid and alkali, the acid and alkali neutralization reaction generates heat, triggering the polymerization reaction of the raw materials to obtain a mixed material, and forming a slight negative pressure in the tail section of the reaction tube through a slight negative pressure device in the tail section of the reaction tube to accelerate the discharge of volatile water in the mixed material; 4) Granulation and drying: granulating the mixture, and then drying the granular mixture to obtain highly absorbent resin particles; 5) grinding and screening, grinding the super absorbent resin particles and screening to obtain super absorbent resin powder; 6) Preparation for delivery: surface treatment of the super absorbent resin powder, mixing and packaging of the super absorbent resin powder, and storage of the packaged super absorbent resin powder product to complete the production of the super absorbent resin.

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