Raw material pretreatment device for methyl acetate production

Abstract

The utility model discloses a raw material pretreatment device for methyl acetate production, which comprises a reaction cylinder, a sealing cover is arranged at the position of an opening at the upper end of the reaction cylinder, a partition plate is fixedly connected inside the reaction cylinder, the inside of the reaction cylinder is divided into a mixing bin and a waste gas bin through the partition plate, the mixing bin is positioned below the waste gas bin, and the waste gas bin is positioned below the mixing bin. Waste liquid is guided into the mixing bin through the water inlet pipe, waste gas is guided into the gas spraying pipe through the gas inlet pipe, the waste gas is sprayed into the waste liquid at a high speed through the nozzles on the gas spraying pipe, the motor is started at the same time, and the waste liquid is sprayed into the mixing bin through the gas spraying pipe. And the rotating column is driven to rotate to drive the stirring rod to stir the waste liquid, so that the waste gas entering the waste liquid can be quickly mixed with the waste liquid, the speed of dissolving methyl acetate in the waste gas into the waste liquid is accelerated, and the pretreatment efficiency of the methyl acetate raw material is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of methyl acetate production, in particular to a raw material pretreatment device for methyl acetate production. Background Art

[0002] There are many ways to produce methyl acetate. One of them is that in the production process of polyvinyl alcohol and terephthalic acid, a large amount of waste liquid (gas) containing methyl acetate will be generated. For these chemical products, the more common treatment method is to directly pass the waste liquid (gas) containing methyl acetate into the distillation tower, and obtain methyl acetate through azeotropic distillation, adsorption distillation, condensation reflux and desorption regeneration.

[0003] Considering that during the production process, the discharged substances are in the form of liquid and gas, and the methyl acetate content therein is different, the extraction efficiency of the methyl acetate contained in the gas is low after entering the distillation tower. Therefore, if it is directly passed into the distillation tower, on the one hand, the reaction time of the distillation tower is prolonged, and on the other hand, the purity of the methyl acetate produced is difficult to meet the production standards.

[0004] According to a feed pretreatment device for a methyl acetate distillation tower disclosed in a Chinese patent document with a publication number of CN212119066U, the waste liquid (gas) containing methyl acetate generated in the production process of polyvinyl alcohol and terephthalic acid can be introduced into a pretreatment tank together, and the concentration of methyl acetate in the waste liquid can be increased by fully merging the waste gas and the waste liquid. On the one hand, the methyl acetate in the waste gas can be fully recycled, and on the other hand, after the waste liquid is introduced into the distillation tower body, the distillation tower does not need to spend more time to extract the methyl acetate in the waste gas, and the overall distillation effect is significantly improved, and the efficiency is higher.

[0005] However, in the above device, the waste gas and waste liquid in the pretreatment tank are only naturally mixed, and there is no measure to accelerate the fusion of the waste gas and waste liquid. In this way, the fusion speed of the waste gas and waste liquid is slow, and the efficiency of pretreatment needs to be improved. To this end, a raw material pretreatment device for methyl acetate production is proposed. Summary of the invention

[0006] The purpose of the utility model is to provide a raw material pretreatment device for methyl acetate production to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a raw material pretreatment device for methyl acetate production, comprising a reaction cylinder, a sealing cover is provided at the upper opening position of the reaction cylinder, a partition plate is fixedly connected to the interior of the reaction cylinder, the interior of the reaction cylinder is divided into a mixing chamber and a waste gas chamber by the partition plate, the mixing chamber is located below the waste gas chamber, a water inlet pipe and an air inlet pipe are fixedly connected to the side wall of the reaction cylinder, the water inlet pipe is in a communicating state with the mixing chamber, an air jet is fixedly installed on the inner wall of the mixing chamber, the air inlet pipe is in a communicating state with the air jet, a rotating column is rotatably installed at the center position of the bottom of the inner cavity of the mixing chamber, the upper end of the rotating column is fixedly connected to the bottom of the partition plate, the bottom of the rotating column is connected to a driving mechanism, and a plurality of stirring rods are fixedly connected to the side wall of the rotating column.

[0008] As a further preferred embodiment of the present technical solution, a plurality of supporting feet are fixedly installed on the bottom of the reaction cylinder, and the plurality of supporting feet are arranged in a ring array.

[0009] As a further preferred embodiment of the present technical solution, a plurality of air holes are provided on the partition plate.

[0010] As a further preferred embodiment of the present technical solution, the driving mechanism comprises a motor, the motor is fixedly mounted on the bottom of the reaction cylinder, and the output shaft of the motor is fixedly connected to the bottom of the rotating column.

[0011] As a further preferred embodiment of the present technical solution, the air jet pipes are distributed in a spiral shape, and a plurality of nozzles are arranged on the inner ring side wall of the air jet pipes.

[0012] As a further preferred embodiment of the present technical solution, a water outlet pipe is fixedly connected to the side wall of the reaction cylinder, the water outlet pipe is connected to the mixing bin, the other end of the water outlet pipe is connected to a water pump, the output end of the water pump is connected to an input pipe, and the other end of the input pipe is connected to the distillation tower.

[0013] As a further preferred embodiment of the present technical solution, an air outlet pipe is fixedly connected to the outer wall of the reaction cylinder, and the air outlet pipe is in a communicating state with the waste gas bin.

[0014] The utility model provides a raw material pretreatment device for methyl acetate production, which has the following beneficial effects:

[0015] The utility model introduces waste liquid into a mixing bin through a water inlet pipe, introduces waste gas into an injection pipe through an air inlet pipe, injects waste gas into the waste liquid at a high speed through a nozzle on the injection pipe, and starts a motor at the same time to drive a rotating column to rotate, thereby driving a stirring rod to stir the waste liquid, so that the waste gas entering the waste liquid can be quickly mixed with the waste liquid, thereby accelerating the speed at which methyl acetate in the waste gas is integrated into the waste liquid, thereby effectively improving the efficiency of pretreatment of methyl acetate raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the disassembly of the overall structure of the utility model;

[0019] Figure 4 For this utility model Figure 3 The structural diagram of A in the figure;

[0020] In the figure: 1. reaction cylinder; 2. sealing cover; 3. supporting foot; 4. water inlet pipe; 5. air inlet pipe; 6. air outlet pipe; 7. water outlet pipe; 8. water pump; 9. input pipe; 10. partition plate; 11. motor; 12. rotating column; 13. stirring rod; 14. jet pipe; 15. nozzle; 16. mixing chamber; 17. exhaust chamber. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] The utility model provides a technical solution: Figures 1 to 4 As shown, in this embodiment, a raw material pretreatment device for methyl acetate production includes a reaction tube 1, a plurality of supporting feet 3 are fixedly installed at the bottom of the reaction tube 1, and the plurality of supporting feet 3 are in a ring array. A sealing cover 2 is arranged at the upper opening position of the reaction tube 1, a partition plate 10 is fixedly connected to the interior of the reaction tube 1, and a plurality of air holes are opened on the partition plate 10. The interior of the reaction tube 1 is divided into a mixing bin 16 and a waste gas bin 17 by the partition plate 10, and the mixing bin 16 is located below the waste gas bin 17. A water inlet pipe 4 and an air inlet pipe 5 are fixedly connected to the side wall of the reaction tube 1, and the water inlet pipe 4 is in a communicating state with the mixing bin 16. An air jet pipe 14 is fixedly installed on the inner wall of the mixing bin 16, and the air inlet pipe 5 is in a communicating state with the air jet pipe 14. A rotating column 12 is rotatably installed at the center position of the bottom of the inner cavity of the mixing bin 16, and the upper end of the rotating column 12 is fixedly connected to the bottom of the partition plate 10, and the bottom of the rotating column 12 is connected to a driving mechanism, and a plurality of stirring rods 13 are fixedly connected to the side wall of the rotating column 12.

[0023] The driving mechanism includes a motor 11 , which is fixedly mounted on the bottom of the reaction cylinder 1 , and an output shaft of the motor 11 is fixedly connected to the bottom of the rotating column 12 .

[0024] When in use, the motor 11 drives the rotating column 12 to rotate, which can drive the stirring rod 13 to stir the waste liquid, so that the waste gas entering the waste liquid can be quickly mixed with the waste liquid, thereby improving the pretreatment efficiency.

[0025] The air injection pipe 14 is distributed in a spiral shape, and a plurality of nozzles 15 are arranged on the inner ring side wall of the air injection pipe 14 .

[0026] The jet pipe 14 is distributed in a spiral shape to prevent the stirring rod 13 from contacting the jet pipe 14 when rotating. The nozzle 15 on the jet pipe 14 can spray the exhaust gas at high pressure, so that the exhaust gas can quickly reach the center of the mixing chamber 16.

[0027] Among them, a water outlet pipe 7 is fixedly connected to the side wall of the reaction cylinder 1, and the water outlet pipe 7 is in a connected state with the mixing chamber 16. The other end of the water outlet pipe 7 is connected to a water pump 8, and the output end of the water pump 8 is connected to an input pipe 9, and the other end of the input pipe 9 is connected to the distillation tower.

[0028] The pre-treated waste liquid in the mixing chamber 16 can be transported into the distillation tower by the water pump 8.

[0029] The outer wall of the reaction tube 1 is fixedly connected with an air outlet pipe 6 , and the air outlet pipe 6 is in communication with the waste gas bin 17 .

[0030] The exhaust gas that has been pre-treated can be conducted to the exhaust gas purification system through the exhaust pipe 6.

[0031] The utility model provides a raw material pretreatment device for methyl acetate production, and the specific working principle is as follows:

[0032] The waste liquid is introduced into the mixing chamber 16 through the water inlet pipe 4, and the waste gas is introduced into the jet pipe 14 through the air inlet pipe 5. The waste gas is sprayed into the waste liquid at a high speed through the nozzle 15 on the jet pipe 14. At the same time, the motor 11 is started to drive the rotating column 12 to rotate, which can drive the stirring rod 13 to stir the waste liquid, so that the waste gas entering the waste liquid can be quickly mixed with the waste liquid, thereby accelerating the speed at which methyl acetate in the waste gas is integrated into the waste liquid. The screened waste gas will enter the waste gas chamber 17 through the air holes on the partition plate 10, and will be conducted to the waste gas purification system through the air outlet pipe 6, and the waste liquid in the mixing chamber 16 will enter the distillation tower under the action of the water pump 8.

[0033] 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 raw material pretreatment device for methyl acetate production, comprising a reaction tube (1), characterized in that: A sealing cover (2) is provided at the upper opening of the reaction cylinder (1); a partition plate (10) is fixedly connected to the interior of the reaction cylinder (1); the interior of the reaction cylinder (1) is divided into a mixing chamber (16) and a waste gas chamber (17) by the partition plate (10); the mixing chamber (16) is located below the waste gas chamber (17); a water inlet pipe (4) and an air inlet pipe (5) are fixedly connected to the side wall of the reaction cylinder (1); the water inlet pipe (4) and the mixing chamber (16) are in a communicating state; an air jet pipe (14) is fixedly mounted on the inner wall of the mixing chamber (16); the air inlet pipe (5) and the air jet pipe (14) are in a communicating state; a rotating column (12) is rotatably mounted at the center of the bottom of the inner cavity of the mixing chamber (16); the upper end of the rotating column (12) is fixedly connected to the bottom of the partition plate (10); the bottom of the rotating column (12) is connected to a driving mechanism; and a plurality of stirring rods (13) are fixedly connected to the side wall of the rotating column (12).

2. A raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: A plurality of supporting feet (3) are fixedly mounted on the bottom of the reaction cylinder (1), and the plurality of supporting feet (3) are arranged in a ring array.

3. The raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: The partition plate (10) is provided with a plurality of air holes.

4. The raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: The driving mechanism comprises a motor (11), the motor (11) being fixedly mounted on the bottom of the reaction cylinder (1), and the output shaft of the motor (11) being fixedly connected to the bottom of the rotating column (12).

5. The raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: The air injection pipes (14) are distributed in a spiral shape, and a plurality of nozzles (15) are arranged on the inner ring side wall of the air injection pipe (14).

6. The raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: A water outlet pipe (7) is fixedly connected to the side wall of the reaction cylinder (1), the water outlet pipe (7) is in a communicating state with the mixing chamber (16), the other end of the water outlet pipe (7) is connected to a water pump (8), the output end of the water pump (8) is in communication with an input pipe (9), and the other end of the input pipe (9) is in communication with the distillation tower.

7. The raw material pretreatment device for methyl acetate production according to claim 1, characterized in that: An air outlet pipe (6) is fixedly connected to the outer wall of the reaction cylinder (1), and the air outlet pipe (6) is in a communicating state with the waste gas bin (17).

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