Mixed reactor and method for preparing methyl methacrylate

Abstract

The invention provides a mixed reactor. The mixed reactor comprises a base, a feeding system and a mixing system, the base comprises a bottom plate, a supporting column and a power assembly which are fixed to the bottom plate, a fixing ring arranged on the top of the supporting column and a supporting block fixed to the upper portion of the fixing ring. The mixing system comprises a stirring device, a fixed shell and a movable shell; the fixed shell is fixedly arranged on the periphery of the fixed ring in a sleeving mode, an annular rack is fixed to the periphery of the movable shell, and the annular rack is meshed with the gear in a matched mode so as to drive the movable shell to rotate; the stirring device comprises a stirring ball suite and a stirring blade suite; the feeding system comprises a feeding port, a discharging pipe, a liquid storage tank and a conveying pipe. According to the mixer disclosed by the invention, reaction materials can be fully contacted with one another, so that the production efficiency is improved, and the quality of reaction products is also improved.

Description

Technical Field

[0001] The invention belongs to the technical field of preparing methyl methacrylate, and particularly relates to a mixed reactor and a method for preparing methyl methacrylate. Background Art

[0002] Methyl methacrylate, with the chemical formula C5H8O2 and the chemical formula weight of 100.12, is an organic compound, also known as MMA, or methyl methacrylate for short. It is an important chemical raw material and a monomer for producing transparent plastic polymethyl methacrylate (plexiglass, PMMA). It is flammable, has a strong pungent odor, and is moderately toxic. Long-term contact should be avoided. Appearance and properties: colorless, volatile liquid with a strong spicy taste, flammable, solubility: soluble in ethanol, ether, acetone and other organic solvents, slightly soluble in ethylene glycol and water.

[0003] At present, methyl methacrylate is a very important chemical raw material. In the process of its preparation, it needs to go through multiple processing steps. In the final step, the required reaction materials need to be placed inside the reactor, and it takes a certain amount of time to complete the production. It requires a lot of work quality, and the mixing quality is not particularly perfect.

[0004] Therefore, when preparing methyl methacrylate, there is a problem of slow reaction rate caused by uneven mixing of reactants, which reduces the production efficiency and quality of methyl methacrylate. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a hybrid reactor and a method for preparing methyl methacrylate.

[0006] In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a hybrid reactor, the reactor comprising a base, a feeding system and a mixing system fixed on the base; the base comprising a bottom plate, a support column and a power assembly fixed on the bottom plate, a fixing ring arranged on the top of the support column and a support block fixed above the fixing ring; a large annular track and a small annular track surrounding the fixing ring are fixed on the support block in sequence from top to bottom; the power assembly comprises a motor and a gear driven by the motor;

[0008] The mixing system comprises a stirring device, a fixed shell, and a movable shell movably mounted above the fixed shell to form a closed mixing chamber with the fixed shell; the fixed shell is fixedly sleeved on the outer periphery of the fixed ring, and an annular rack is fixed on the outer periphery of the movable shell, and the annular rack is adapted to mesh with the gear to drive the movable shell to rotate; the stirring device comprises a stirring ball kit and a stirring blade kit, wherein,

[0009] The stirring ball kit comprises an integrally connected hollow stirring ball, a hollow rotating cylinder and a small roller, wherein the hollow stirring ball is embedded in the mixing inner cavity, the rotating cylinder passes through the movable shell and one end of the rotating cylinder is connected to the hollow stirring ball, and the other end is fixed to the small roller, and the small roller is in rolling contact with the small track;

[0010] The stirring blade kit comprises a stirring blade, a rotating rod and a large roller connected in an integral manner, wherein the rotating rod passes through the hollow rotating cylinder and one end of the rotating rod is fixed to the stirring blade, and the other end is fixed to the large roller, and the large roller is in rolling contact with the large track;

[0011] The feeding system includes a feed port arranged on the top of the movable shell, a discharge pipe located below the fixed shell, a liquid storage tank and a feed pipe fixed on the bottom plate, one end of the feed pipe is connected to the liquid storage tank, and the other end is connected to the mixing cavity.

[0012] In the present invention, a plurality of through holes are arranged on the surface of the hollow stirring ball, so that the materials inside and outside the hollow stirring ball are interconnected and fully mixed.

[0013] In the hybrid reactor provided by the present invention, by setting small rollers and large rollers of different diameters, the self-rotation speed of the small roller when rolling around the small track is faster than the self-rotation speed of the large roller when rolling around the large track, so that the corresponding stirring ball and stirring blade can produce a rotation speed difference, and the reaction materials that rotate into the stirring ball can be effectively mixed and reacted under the stirring of the stirring blade; at the same time, it also avoids the same speed rotation to achieve the mixing effect, accelerates the mutual contact between the reaction materials, improves production efficiency, and sufficient contact reaction also improves the quality of the reaction product. In some specific embodiments, the diameter ratio of the large roller to the small roller is (1.5-4):1, preferably 2.5:1.

[0014] The mixing system of the hybrid reactor provided in the present invention comprises 6 to 8 stirring devices to increase the mixing effect between materials, preferably 6 stirring devices.

[0015] In the mixer provided by the present invention, the material in the liquid storage tank is transported to the mixing cavity formed by the fixed shell and the movable shell through the feed pipe. In some specific embodiments, a plurality of liquid spray heads are arranged at the bottom of the fixed shell for spraying the material in the feed pipe into the mixing cavity to react with the material therein, so that the materials can fully react with each other, thereby accelerating the overall rate, shortening the processing time, and thus improving the production efficiency and quality of the product.

[0016] In some specific embodiments, 4 to 6 support columns are arranged on the bottom plate, and each of the support columns is arranged in a circular array; preferably, the support columns and the support blocks are arranged correspondingly up and down.

[0017] In some specific embodiments, the liquid storage tank is equipped with a liquid inlet nozzle for adding reaction materials into the liquid storage tank, and a pump body is arranged above the liquid storage tank for providing power for conveying the materials in the liquid storage tank.

[0018] In some specific embodiments, a control valve is provided on the outer side of the discharge pipe below the fixed shell to control the discharge speed.

[0019] In a second aspect, the present invention provides a method for preparing methyl methacrylate, comprising: mixing methacrylic acid and methanol as raw materials in a certain ratio in a reactor and reacting them to obtain methyl methacrylate; wherein the reactor is the above-mentioned hybrid reactor.

[0020] In some specific embodiments, the feed mass ratio of methacrylic acid to methanol is (2.6-2.8):1.

[0021] The above technical solution has the following technical effects:

[0022] The mixer provided by the present invention drives the movable shell to drive the corresponding rotating cylinder to rotate through the gear drive, so that the rotating cylinder drives the stirring ball to move, stirs the material in the mixing cavity formed by the movable shell and the fixed shell, and completes the preliminary mixing reaction of the reaction material; at the same time, the reactor drives the rotating cylinder and the hollow stirring ball to rotate by the movement of the small roller around the small track, and drives the rotating rod and the stirring blade to rotate by the movement of the large roller around the large track, so that the material in the mixing cavity is stirred and mixed again through the through hole, and the movable shell drives the rotating cylinder and the hollow stirring ball to revolve while cooperating with the rolling movement of the small roller and the small track to make the stirring ball rotate, and quickly stirs and mixes the material, ensuring that the internal material can be fully mixed, making the final product quality more perfect, and improving the overall processing quality.

[0023] The mixer provided by the present invention is provided with small rollers and large rollers of different diameters, so that the rotation speed of the small roller when rolling around the small track is faster than the rotation speed of the large roller when rolling around the large track, so that a rotation speed difference is generated between the hollow stirring ball and the stirring blade, and the reaction materials inside and outside the ball can be effectively mixed and reacted, which accelerates the mutual contact between the reaction materials and improves the production efficiency. Sufficient contact reaction also improves the quality of the reaction product.

[0024] The mixer provided by the present invention sprays the reaction materials in the fixed shell through the liquid spray head to react, thereby accelerating the overall rate, shortening the processing time, and thus improving the production efficiency and quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 : A schematic structural diagram of an embodiment of a hybrid reactor of the present invention;

[0026] Figure 2 : Figure 1 sectional view of

[0027] Figure 3 : Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0028] Figure 4 : A schematic diagram of the structure of a hollow stirring ball in a hybrid reactor of the present invention;

[0029] Figure 5 : A schematic structural diagram of a fixed shell in a hybrid reactor of the present invention;

[0030] Among them, 1. bottom plate, 2. support column, 3. fixed ring, 4. support block, 5. movable shell, 6. annular rack, 7. motor, 8. gear, 9. liquid storage tank, 10. pump body, 11. feed pipe, 12. through hole, 13. spray head, 14. fixed shell, 15. rotating cylinder, 16. small roller, 17. hollow stirring ball, 18. rotating rod, 19. stirring blade, 20. large roller, 21. small track, 22. large track, 23. feed port, 24. liquid inlet nozzle, 25. discharge pipe. DETAILED DESCRIPTION

[0031] The structure of the hybrid reactor of the present invention and the application of the method of the present invention in the preparation process of methyl methacrylate are further described below in conjunction with the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0032] like Figure 1 , 2As shown, the hybrid reactor provided by the present invention comprises a base, a feeding system and a mixing system fixed on the base; the base comprises a bottom plate 1, and a support column 2 and a power assembly fixed on the surface of the bottom plate 1, the top of the support column 2 is fixedly connected to a circular fixing ring 3, and a support block 4 is fixedly arranged above the fixing ring 3. Figure 3 As shown, a large ring track 22 and a small ring track 21 are arranged around the top of the fixing ring 3 . Both the large ring track 22 and the small ring track 21 are fixed on the supporting block 4 , and the large ring track 22 is located above the small ring track 21 .

[0033] The power assembly of the mixer of the present invention comprises a motor 7 and a gear 8 driven to rotate by the motor 7, and is used to provide rotational power for the mixer.

[0034] like Figure 3-5 As shown, the mixing system of the mixer of the present invention includes a stirring device, a fixed shell 14 and a movable shell 5. The fixed shell 14 and the movable shell 5 are movably connected to each other so that the two can rotate relative to each other. The specific connection relationship can be rotation, thread, etc. A relatively closed mixing cavity structure is formed between the mutually connected fixed shell 14 and the movable shell 5 to provide a place for the mixing reaction. The fixed shell 14 is fixedly sleeved on the outer periphery of the fixed ring 3, and an annular rack 6 is fixed on the outer periphery of the movable shell 5. The annular rack 6 is adapted to mesh with the gear 8 in the power assembly. When the gear 8 rotates, the annular rack 6 also rotates with it, thereby driving the movable shell 5 to rotate.

[0035] The stirring device includes a stirring ball set and a stirring blade set, wherein the stirring ball set includes an integrally connected hollow stirring ball 17, a hollow rotating cylinder 15 and a small roller 16, the hollow stirring ball 17 is embedded in the mixing cavity, the rotating cylinder 15 passes through the movable housing 5 and one end is connected to the surface of the hollow stirring ball 17, and the other end is fixed on the small roller 16, and the small roller 16 is in rolling contact with the small track 21. The stirring blade set includes an integrally connected stirring blade 19, a rotating rod 18 and a large roller 20, the rotating rod 18 passes through the hollow rotating cylinder 15 and one end is fixed on the stirring blade 19, and the other end is fixed on the large roller 20, and the large roller 20 is in rolling contact with the large track 22.

[0036] When the gear 8 and the annular rack 6 that are adapted to each other mesh and rotate, the movable shell 5 and the fixed shell 14 are driven to move relative to each other. During the movement of the movable shell 5, the corresponding small roller 16 will be driven to roll around the small track 21, and the rotating cylinder 15 will also move, and then the rotating cylinder 15 will drive the hollow stirring ball 17 to rotate in the mixing cavity to stir the material in the cavity; at the same time, the movement of the small roller 16 around the small track 21 also drives the large roller 20 to move around the large track 22, and the rotation of the large roller 20 causes the stirring blade 19 to rotate in the hollow stirring ball 17.

[0037] In the mixer of the present invention, the movable shell 5 drives the rotating drum 15 and the hollow stirring ball 17 to revolve, and the rolling motion of the small roller 16 and the small track 21 causes the hollow stirring ball 17 to rotate, so as to quickly stir and mix the materials. The movement of the small roller 16 around the small track 21 drives the rotating drum 15 and the hollow stirring ball 17 to rotate, and the movement of the large roller 20 around the large track 22 drives the rotating rod 18 and the stirring blade 19 to rotate, thereby further improving the efficiency of the mixing reaction.

[0038] In some specific embodiments, the diameter ratio of the large roller 20 to the small roller 16 is controlled to be (1.5-4):1, preferably 2.5:1; by setting the diameters of the small roller 16 and the large roller 20 to be different, the rotation speed of the small roller 16 when rolling around the small track 21 can be faster than the rotation speed of the large roller 20 when rolling around the large track 22, so that the corresponding hollow stirring ball 17 and stirring blade 19 can produce a rotation speed difference, and the reaction materials entering the hollow stirring ball 17 can be more fully mixed and reacted through the rotation of the stirring blade 19, avoiding the phenomenon of poor mixing effect caused by the same rotation speed, accelerating the mutual contact between the reaction materials, improving production efficiency, and improving the quality of the reaction product.

[0039] In some specific embodiments, a plurality of through holes 12 are provided on the surface of the hollow stirring ball 17 , so that the material entering the hollow stirring ball 17 through the through holes 12 is stirred and mixed again under the rotation of the stirring blades 19 .

[0040] The feeding system in the mixer of the present invention comprises a liquid storage tank 9 fixed on the bottom plate 1, a feed port 23 arranged on the top of the movable shell 5, a discharge pipe 25 located below the fixed shell 14, and a feed pipe 11. One end of the feed pipe 11 is connected to the material outlet of the liquid storage tank 9, and the other end is connected to the mixing cavity; in some specific embodiments, a plurality of liquid spray heads 13 are arranged at the bottom of the fixed shell 14, which are used to spray the material in the feed pipe 11 into the mixing cavity for mixing reaction.

[0041] In some specific embodiments, a control valve is provided on the outside of the discharge pipe 25 to control the discharge speed.

[0042] In some specific embodiments, the liquid storage tank 9 is also equipped with a liquid inlet nozzle 24 and a pump body 10 for providing power for conveying the material in the liquid storage tank 9 to the mixing system.

[0043] like Figure 4 As shown, the mixing system includes 6 stirring devices.

[0044] In some specific embodiments, 4 to 6 support columns 2 are arranged on the bottom plate 1, and each support column 2 is arranged in a circular array; preferably, the support columns 2 and the support blocks 4 are arranged correspondingly up and down.

[0045] The specific operation process of using the hybrid reactor of the present invention is as follows:

[0046] Step 1: feed the required reaction material into the mixing cavity formed by the movable shell 5 and the fixed shell 14 through the feed port 23, and screw on the top cover; inject another reaction material into the liquid storage tank 9 through the liquid inlet nozzle 24 and wait for use;

[0047] Step 2: Start the motor 7, which drives the gear 8 to rotate. Driven by the gear 8, the annular rack 6 on the outer side of the movable housing 5 rotates, thereby driving the movable housing 5 to move around the fixed ring 3;

[0048] The movement of the movable shell 5 drives the corresponding rotating drum 15 to move, so that the rotating drum 15 drives the stirring ball 17 to move, and the materials in the mixing cavity formed by the movable shell 5 and the fixed shell 14 are stirred. The movement of the small roller 16 around the small track 21 drives the rotating drum 15 and the stirring ball 17 to rotate. The movement of the large roller 20 around the large track 22 drives the rotating rod 18 and the stirring blade 19 to rotate, so that the materials entering the stirring ball 17 through the through hole 12 are stirred and mixed again under the rotation of the stirring blade 19. The movable shell 5 drives the rotating drum 15 and the hollow stirring ball 17 to revolve, and the rolling movement of the small roller 16 and the small track 21 causes the stirring ball 17 to rotate, so that the materials are stirred and mixed quickly.

[0049] Step 3, start the pump body 10, extract the raw materials in the liquid storage tank 9 and transport them to the spray head 13 through the infusion pipe 11, and then spray it to the reaction materials in the fixed shell 14 for reaction. After the reaction is completed, open the control valve and discharge and collect the products through the discharge pipe 25.

[0050] The present invention is further described below with reference to embodiments.

[0051] Use as Figure 1 In the hybrid reactor shown, the raw material methacrylic acid is placed in the mixing cavity through the feed port 23, and the raw material methanol is injected into the liquid storage tank 9 through the liquid inlet nozzle 24. Then the motor 7 is started, and methacrylic acid and methanol are fed in a ratio of 2.7:1 to react. After 0.3 hours, methyl methacrylate is discharged from the discharge pipe 25.

[0052] According to detection, the yield of methyl methacrylate produced by using the hybrid reactor provided by the present invention is increased to 54%.

Claims

1. A hybrid reactor, characterized in that: The reactor comprises a base, a feeding system and a mixing system fixed on the base; the base comprises a bottom plate, a support column and a power assembly fixed on the bottom plate, a fixing ring arranged on the top of the support column and a support block fixed above the fixing ring; a large and a small annular track surrounding the fixing ring are fixed on the support block in sequence from top to bottom; the power assembly comprises a motor and a gear driven by the motor; The mixing system comprises a stirring device, a fixed shell, and a movable shell movably mounted above the fixed shell to form a closed mixing chamber with the fixed shell; the fixed shell is fixedly sleeved on the outer periphery of the fixed ring, and an annular rack is fixed on the outer periphery of the movable shell, and the annular rack is adapted to mesh with the gear to drive the movable shell to rotate; the stirring device comprises a stirring ball kit and a stirring blade kit, wherein, The stirring ball kit comprises an integrally connected hollow stirring ball, a hollow rotating cylinder and a small roller, wherein the hollow stirring ball is embedded in the mixing inner cavity, the rotating cylinder passes through the movable shell and one end of the rotating cylinder is connected to the hollow stirring ball, and the other end is fixed to the small roller, and the small roller is in rolling contact with the small track; The stirring blade kit comprises a stirring blade, a rotating rod and a large roller connected in an integral manner, wherein the rotating rod passes through the hollow rotating cylinder and one end of the rotating rod is fixed to the stirring blade, and the other end is fixed to the large roller, and the large roller is in rolling contact with the large track; The feeding system includes a feed port arranged on the top of the movable shell, a discharge pipe located below the fixed shell, a liquid storage tank and a feed pipe fixed on the bottom plate; one end of the feed pipe is connected to the liquid storage tank, and the other end is connected to the mixing cavity.

2. The hybrid reactor according to claim 1, characterized in that: A plurality of through holes are arranged on the surface of the hollow stirring ball so that materials inside and outside the hollow stirring ball are connected to each other.

3. The hybrid reactor according to claim 1 or 2, characterized in that: The diameter ratio of the large roller to the small roller is (1.5-4):1, preferably 2.5:

1.

4. The hybrid reactor according to any one of claims 1 to 3, characterized in that: The mixing system comprises 6 to 8 stirring devices.

5. The hybrid reactor according to any one of claims 1 to 4, characterized in that: A plurality of liquid spray heads are arranged at the bottom of the fixed shell for spraying the material in the material conveying pipe into the mixing inner cavity.

6. The hybrid reactor according to claim 5, characterized in that: 4 to 6 support columns are arranged on the bottom plate, and each of the support columns is arranged in a circular array; Preferably, the support column and the support block are arranged correspondingly up and down.

7. The hybrid reactor according to claim 6, characterized in that: The liquid storage tank is provided with a liquid inlet nozzle and a pump body, which are used to provide conveying power for the material in the liquid storage tank.

8. The hybrid reactor according to claim 7, characterized in that: A control valve is arranged on the outside of the discharge pipe to control the discharge speed.

9. A method for preparing methyl methacrylate, the method comprising: mixing methacrylic acid and methanol as raw materials in a certain ratio in a reactor and reacting them to obtain methyl methacrylate; wherein: The reactor is a hybrid reactor according to any one of claims 1 to 8.

10. The method according to claim 9, characterized in that The feed mass ratio of the raw materials methacrylic acid and methanol is (2.6-2.8):1.

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