Alkaline lignin graft copolymerization chemical modification reaction device

Abstract

The utility model discloses an alkaline lignin graft copolymerization chemical modification reaction device, which belongs to the technical field of lignin modification, and comprises a tank body, a jacket and a stirring component, a heat exchange cavity is arranged in the jacket, an inlet pipe and an outlet pipe are arranged on the jacket, a working cavity is arranged in the tank body, and a feeding pipe and a discharging pipe are arranged on the tank body. The stirring assembly comprises a stirring motor, a stirring shaft and a cutter, a partition plate is arranged on the inner wall of the tank body and divides the working cavity into a first working space and a second working space, the first working space communicates with the second working space through a first channel, and the cutter is located in the first working space. According to the utility model, the heat exchange cavity is used for indirectly heating the solution in the tank body, and the heating is uniform; the stirring and crushing effects of the cutter are good, and lignin is in full contact with a solution; a shear pump is arranged, so that lignin is in full contact with a solution, the solution is circulated, the temperature uniformity during reaction is improved, the reaction is uniform, and the grafting rate is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of lignin modification, and in particular relates to an alkaline lignin graft copolymerization chemical modification reaction device. Background Art

[0002] Lignin, as a polymer material in nature, is the second largest renewable biomass resource after cellulose. Lignin molecules have a rigid and complex three-dimensional network structure and are difficult to modify. In order to improve the structure of lignin and increase its added value, graft copolymerization can be used to prepare polymer-modified lignin to improve its compatibility with macromolecules. In many research works, the graft copolymerization reaction of lignin and polymers has been achieved through chemical, electrochemical, enzyme catalysis and other methods, and lignin graft copolymers with specific structures and functions have been synthesized. When grafting copolymerization chemical modification reaction of lignin is carried out, the reaction equipment usually uses an agitator to stir the lignin powder and solution, and then heats the solution after stirring for reaction. Some equipment has poor stirring effect and uses a heater to directly heat the solution. Since the temperature of the solution close to the heater rises quickly, stirring alone is likely to cause overheating of part of the solution and uneven overall heating temperature, which affects the reaction and affects the yield and grafting rate of the grafted product. Utility Model Content

[0003] The technical problem solved by the utility model is to provide an alkaline lignin graft copolymerization chemical modification reaction device to improve the mixing effect of lignin and solution during the reaction and improve the heating uniformity.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A chemical modification reaction device for grafting copolymerization of alkaline lignin comprises a tank body, a jacket connected to the tank body and a stirring assembly arranged on the tank body, a heat exchange chamber is arranged in the jacket, an inlet pipe and an outlet pipe connected to the heat exchange chamber are arranged on the jacket, a working chamber is arranged in the tank body, a feed pipe and a discharge pipe connected to the working chamber are arranged on the tank body, the stirring assembly comprises a stirring motor, a stirring shaft connected to the stirring motor and a tool arranged on the stirring shaft, a partition plate is arranged on the inner wall of the tank body, the partition plate divides the working chamber into a first working space and a second working space, the first working space is connected to the second working space through a first channel, and the tool is located in the first working space.

[0006] Preferably, a shear pump is further connected to the tank body, and an inlet end of the shear pump is connected to the second working space through a first pipeline, and an outlet end of the shear pump is connected to the first working space through a second pipeline.

[0007] Preferably, a nozzle connected to the second pipeline is provided in the first working space.

[0008] Preferably, the nozzle position corresponds to the feed pipe.

[0009] Preferably, the tank body comprises a slope portion, and the slope portion gradually rises from the first working space toward the second working space.

[0010] Preferably, the first channel is formed between the lower end of the partition plate and the inner wall of the slope portion.

[0011] Preferably, the discharge pipe is connected to the lowest point of the slope portion.

[0012] Preferably, more than one folding plate is provided in the feed pipe.

[0013] Preferably, the tool comprises a plurality of first blades and a plurality of second blades.

[0014] Preferably, a plurality of supporting legs are connected to the bottom of the jacket.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] 1. A tank body and a jacket are provided, a heat exchange cavity is provided in the jacket, and the solution in the tank body is indirectly heated by the heat exchange cavity so as to be heated evenly;

[0017] 2. The working chamber in the tank is divided into a first working space and a second working space by setting a partition plate. The tool of the stirring assembly works in the smaller first working space. The stirring and crushing effect of the tool is good, and the lignin is fully in contact with the solution.

[0018] 3. A shear pump is set to make the lignin fully contact with the solution and circulate the solution to improve the temperature uniformity during the reaction, so that the reaction is uniform and the grafting rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the device of the embodiment of the utility model;

[0020] Figure 2 1. It is a schematic structural diagram of the feed pipe of the embodiment;

[0021] Figure 3 is a schematic diagram of the structure of the stirring assembly of the embodiment;

[0022] Figure 4 It is a schematic diagram of the structure of the first channel of the embodiment. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1 As shown, an alkaline lignin graft copolymerization chemical modification reaction device comprises a tank body 1, a jacket 2 and a stirring assembly. The tank body 1 is a horizontal tank. The interior of the tank body 1 is a working chamber for lignin to react with a related solution. The jacket 2 is semi-enclosed and arranged on the outer wall of the tank body 1. The jacket 2 surrounds the lower half of the tank body 1. A heat exchange chamber 22 is arranged in the jacket 2. An inlet pipe 21 and an outlet pipe 23 are arranged on the jacket 2. The inlet pipe 21 is arranged on one side of the jacket 2, and the outlet pipe 23 is arranged on the other side of the jacket 2. The inlet pipe 21 and the outlet pipe 23 are both connected to the heat exchange chamber 22. An external heat exchange medium, such as water or heat transfer oil, enters the heat exchange chamber 22 through the inlet pipe 21, exchanges heat with the reaction solution in the working chamber on the wall of the tank body 1, and is discharged from the outlet pipe 23. The heat exchange medium is used to heat and heat the reaction solution, which is gentler than directly using a heater, prevents the reaction solution from being overheated, and heats each place evenly. Four supporting legs 8 are connected to the bottom of the jacket 2 to support the tank body 1 and the jacket 2 as a whole.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the stirring assembly is arranged on the tank body 1, and the stirring assembly includes a stirring motor 31, a stirring shaft 32 and a cutter 33. The stirring motor 31 is arranged on the top outside the tank body 1, the stirring shaft 32 is connected to the stirring motor 31 and penetrates downward through the wall of the tank body 1 into the working chamber, and the cutter 33 is arranged on the stirring shaft 32. The cutter 33 includes a plurality of first blades 331 and a plurality of second blades 332. The plurality of first blades 331 and the plurality of second blades 332 are arranged in multiple groups, and the first blades 331 and the second blades 332 are arranged at different heights on the stirring shaft 32 to play a stirring and crushing role.

[0026] like Figure 1 , Figure 2 and Figure 4As shown, a partition plate 4 is provided on the inner wall of the tank body 1, and the partition plate 4 is arranged at a position in the middle of the working chamber, biased towards the end where the stirring assembly is located. The partition plate 4 is a straight plate, and the upper end of the partition plate 4 is connected to the inner top wall of the tank body 1, and the lower end of the partition plate 4 extends toward the inner bottom wall of the tank body 1 and has a distance from the inner bottom wall of the tank body 1. The partition plate 4 divides the working chamber into a first working space 13 and a second working space 14. The first working space 13 is on the left, and the second working space 14 is on the right. The volume of the first working space 13 is smaller than that of the second working space 14. The tool 33 is located in the first working space 13. Since the volume of the first working space 13 is small relative to the volume of the entire working chamber, the stirring and crushing effects of the tool 33 can be improved, and there is no need to set a stirring tool in the entire working chamber. A feed pipe 11 and a discharge pipe 12 are provided on the tank body 1, and both the feed pipe 11 and the discharge pipe 12 are connected to the working chamber, and the feed pipe 11 is set at a position corresponding to the first working space 13. The lignin or solution to be put into the working chamber first enters the first working space 13. Two folding plates 111 are provided in the feed pipe 11, and the folding plates 111 are connected to the inner wall of the feed pipe 11 and tilted downward. The input lignin and additives are deflected by the folding plates 111 and then enter the first working space 13, where they are stirred and crushed and evenly mixed with the solution. The discharge pipe 12 is connected to the bottom wall of the tank body 1, and a discharge valve is provided on the discharge pipe 12, and the reacted material is discharged from the discharge pipe 12.

[0027] like Figure 1 and Figure 4 As shown, the tank body 1 includes a slope 101, which is located on the bottom wall of the tank body 1. The slope 101 gradually rises from the first working space 13 to the second working space 14. The position of the slope 101 corresponds to the partition plate 4. A first channel 15 is formed between the lower end of the partition plate 4 and the inner wall of the slope 101. The first working space 13 is connected to the second working space 14 through the first channel 15, so that the solution in the first working space 13 enters the second working space 14 after passing through the first channel 15. Due to the provision of the slope 101, when the two spaces contain solutions of equal height, the solution in the first working space 13 is affected by the gravity of the upward slope, which slows down the flow rate of the solution in the first working space 13 into the second working space 14. When lignin is just put into the first working space 13, the mixed solution of lignin and solution is stirred more in the first working space 13 and fully mixed. The discharge pipe 12 is connected to the lowest point of the slope 101 and guides the discharge of the reacted materials.

[0028] like Figure 1 and Figure 4As shown, the tank body 1 is also connected with a shear pump 5, which is arranged on the outer top wall of the tank body 1. The shear pump 5 adopts an existing shear pump, and utilizes the high tangential speed and high-frequency mechanical effect generated by the high-speed rotation of the rotor to subject the material to strong mechanical and hydraulic shearing, centrifugal extrusion, liquid layer friction, impact tearing and turbulence in the narrow gap between the stator and the rotor, so as to promote the immiscible solid phase and liquid phase to be uniformly and finely dispersed and emulsified under the corresponding process and the appropriate amount of additives. The inlet end of the shear pump 5 is connected to the second working space 14 through the first pipeline 51, and the first pipeline 51 extends downward to the lower port at a distance from the inner bottom wall of the tank body 1. The outlet end of the shear pump 5 is connected to the first working space 13 through the second pipeline 52, so that the mixed liquid after the material mixing is transported back to the first working space 13, so that the lignin is fully contacted with the solution, the reaction is uniform, and the grafting rate is high. The shear pump 5 plays the role of mixing and also plays the role of a circulation pump, which is conducive to the uniform heating temperature of the solution during the lignin modification reaction.

[0029] like Figure 1 and Figure 2 As shown, a nozzle 6 connected to the second pipeline 52 is provided in the first working space 13, and the nozzle 6 is connected to the outlet end of the second pipeline 52. The position of the nozzle 6 corresponds to the position of the feed pipe 11, and the nozzle 6 faces the falling channel below the feed pipe 11. When lignin falls into the first working space 13 from the feed pipe 11, the shear pump 5 is started, and the solution in the working chamber is sprayed out through the nozzle 6, and the atomized droplets are pre-mixed with the lignin. The mixing effect of the solution and the lignin is good, which is conducive to uniform reaction.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An alkaline lignin graft copolymerization chemical modification reaction device, characterized in that: The invention comprises a tank body (1), a jacket (2) connected to the tank body (1), and a stirring assembly arranged on the tank body (1); a heat exchange chamber (22) is arranged in the jacket (2); an inlet pipe (21) and an outlet pipe (23) connected to the heat exchange chamber (22) are arranged on the jacket (2); a working chamber is arranged in the tank body (1); a feed pipe (11) and a discharge pipe (12) communicated with the working chamber are arranged on the tank body (1); the stirring assembly comprises a stirring motor (31), a stirring shaft (32) connected to the stirring motor (31), and a cutter (33) arranged on the stirring shaft (32); a partition plate (4) is arranged on the inner wall of the tank body (1); the partition plate (4) divides the working chamber into a first working space (13) and a second working space (14); the first working space (13) is communicated with the second working space (14) through a first channel (15); and the cutter (33) is located in the first working space (13).

2. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 1, characterized in that: The tank body (1) is also connected to a shear pump (5); the inlet end of the shear pump (5) is connected to the second working space (14) via a first pipeline (51); the outlet end of the shear pump (5) is connected to the first working space (13) via a second pipeline (52).

3. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 2, characterized in that: A nozzle (6) connected to the second pipeline (52) is provided in the first working space (13).

4. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 3, characterized in that: The position of the nozzle (6) corresponds to the feeding pipe (11).

5. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 1, characterized in that: The tank body (1) comprises a slope portion (101), and the slope portion (101) gradually rises from the first working space (13) towards the second working space (14).

6. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 5, characterized in that: The first channel (15) is formed between the lower end of the partition plate (4) and the inner wall of the slope portion (101).

7. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 5, characterized in that: The discharge pipe (12) is connected to the lowest point of the slope portion (101).

8. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 1, characterized in that: One or more folding plates (111) are arranged inside the feed pipe (11).

9. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 1, characterized in that: The tool (33) includes a plurality of first blades (331) and a plurality of second blades (332).

10. The alkaline lignin graft copolymerization chemical modification reaction device according to claim 1, characterized in that: A plurality of supporting legs (8) are connected to the bottom of the jacket (2).

Images