A waste gas treatment device for methyl acetate production process

Abstract

The utility model relates to the technical field of methyl acetate production, specifically a waste gas treatment device for the methyl acetate production process, comprising a treatment box and a waste gas treatment mechanism, wherein an air inlet pipe is arranged on the top of the treatment box, and a sodium hydroxide solution is arranged in the treatment box; the waste gas treatment mechanism comprises an exhaust pipe, a filter pipe and a positioning assembly, wherein the filter pipe is threadedly connected to the inside of the exhaust pipe, and a through hole is arranged on one side of the exhaust pipe; the through hole is communicated with the inside of the treatment box; a filter plate is arranged in the exhaust pipe, and a water absorption filter column is arranged in the filter pipe; the positioning assembly comprises a sealing ring and a spring; the sealing ring is arranged between the water absorption filter column and the filter plate; an annular groove is provided on the side wall of the filter pipe, a limiting ring is arranged in the annular groove, a convex ring is arranged on the side wall of the sealing ring, and the convex ring is arranged in the annular groove, one end of the spring is connected to the annular groove, and the other end is connected to the convex ring. The utility model can prevent waste gas from leaking during the filtering process, and the filter plate can be quickly replaced to improve the filtering effect.

Description

Technical Field

[0001] The utility model relates to the technical field of methyl acetate production, in particular to a waste gas treatment device in the methyl acetate production process. Background Art

[0002] Methyl acetate, also known as methyl acetate, has a wide range of uses in industry. It is the raw material for carbonylation to produce acetic anhydride and hydrogenation to produce ethanol. Ethanol is a bulk chemical product and is widely used in fuel, solvent and other fields. The social demand is strong. Using methyl acetate hydrogenation to replace fermentation to produce ethanol can save a lot of food. Methyl acetate is also a good solvent, used to replace acetone, butanone, ethyl acetate, cyclopentane, etc. Because methyl acetate is non-toxic and does not belong to the restricted use of organic pollutant emissions, it can meet the new environmental protection standards of coatings, inks, resins, and adhesives. It is increasingly sought after by people. The main production method of methyl acetate is to synthesize acetic acid by methanol and carbonyl, and then acetic acid and methanol react under the action of a strong acid catalyst to produce the product.

[0003] In the production process of methyl acetate, due to the volatility of methyl acetate, a large amount of organic waste gas will be generated, which may contain harmful acidic gases and other pollutants. If these waste gases are directly discharged into the environment without treatment, they will have a serious impact on air quality and human health.

[0004] Traditional waste gas treatment methods have problems such as low treatment efficiency, complex operation, and inconvenient maintenance. During the filtration process, waste gas is prone to leakage, affecting the treatment effect. At the same time, the cleaning and replacement of filter components are complicated and time-consuming. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a waste gas treatment device for the production process of methyl acetate, which can prevent waste gas leakage during the filtering process and can quickly replace the filter plate to improve the filtering effect.

[0006] To achieve the above-mentioned purpose, according to the embodiment of the first aspect of the utility model, a waste gas treatment device for the production process of methyl acetate is provided, comprising a treatment box and a waste gas treatment mechanism, wherein an air inlet pipe is arranged on the top of the treatment box, and a sodium hydroxide solution is arranged in the treatment box; the waste gas treatment mechanism comprises an exhaust pipe, a filter pipe and a positioning assembly, wherein the filter pipe is threadedly connected to the inside of the exhaust pipe, and a through hole is arranged on one side of the exhaust pipe; the through hole is communicated with the inside of the treatment box; a filter plate is arranged in the exhaust pipe, and the filter plate is located on the side wall of the through hole; a water absorption filter column is arranged in the filter pipe; the positioning assembly comprises a sealing ring and a spring; the sealing ring is arranged between the water absorption filter column and the filter plate; an annular groove is provided on the side wall of the filter pipe, a limiting ring is arranged in the annular groove, a convex ring is arranged on the side wall of the sealing ring, and the convex ring is arranged in the annular groove, one end of the spring is connected to the bottom of the annular groove, and the other end abuts on the convex ring; the limiting ring limits the convex ring.

[0007] As a further solution of the utility model: a mounting ring is arranged on the outer peripheral wall of the filter tube, one end of the exhaust pipe is arranged in the mounting ring, and a sealing ring is arranged between the exhaust pipe and the mounting ring.

[0008] As a further solution of the utility model: the inner circle size of the sealing ring is smaller than the opening size of the filter tube, and the sealing ring limits the water absorption filter column.

[0009] As a further solution of the utility model: a liquid inlet is arranged on the top of the processing box, and a liquid outlet is arranged on the side wall of the processing box; a leakage plate is arranged in the processing box, and one end of the air inlet pipe passes through the leakage plate and is connected to a serpentine tube, and the serpentine tube is provided with a plurality of air holes.

[0010] As a further solution of the utility model: a one-way valve is provided at the outlet end of the filter tube.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model uses a sealing ring and a spring to make the seal between the water absorption filter column and the filter plate tighter, preventing the leakage of exhaust gas during the filtering process. At the same time, the filter tube is threadedly connected to the exhaust pipe, so the filter plate can be quickly cleaned or replaced. After opening the filter tube, the spring is limited by the limit ring to prevent the sealing ring from falling.

[0013] 2. The utility model provides a mounting position for the sealing ring by setting a mounting ring, and also helps to fix the exhaust pipe and the filter pipe so that they can be stably connected together to avoid loose connection or dislocation due to vibration or other factors during use.

[0014] 3. The utility model makes the inner ring size of the sealing ring smaller than the opening size of the filter tube, so that the sealing ring can fit tightly at the opening of the filter tube, which plays a limiting role on the water absorption filter column, and can ensure that the water absorption filter column is firmly fixed in the filter tube without displacement or falling off, thereby improving stability. At the same time, when the exhaust pipe is opened to clean or replace the filter plate, the sealing ring can release the lock on the water absorption filter column under the elastic force of the spring, which is also convenient for replacing the water absorption filter column.

[0015] 4. The utility model facilitates the replacement of the sodium hydroxide solution by arranging the liquid inlet and the liquid outlet, and the gas can be discharged in a distributed manner through the orifice plate design. At the same time, the contact area and time between the exhaust gas and the solution are increased through the serpentine tube, thereby improving the exhaust gas treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a waste gas treatment device in the production process of methyl acetate.

[0017] Figure 2 Schematic diagram of the internal structure of the processing box.

[0018] Figure 3 Installation cross-sectional view of the exhaust gas treatment mechanism.

[0019] Figure 4 Partial cross-sectional view of the sealing ring installation.

[0020] The reference numerals in the figure are: 1. treatment box; 11. liquid inlet; 12. liquid outlet; 13. leak plate; 2. air inlet pipe; 21. serpentine pipe; 22. air vent; 3. exhaust pipe; 31. through hole; 32. filter plate; 4. filter tube; 41. annular groove; 42. limit ring; 43. spring; 44. water absorption filter column; 5. sealing ring; 51. convex ring; 6. mounting ring; 61. sealing ring; 7. one-way valve. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figures 1 to 4 As shown, a waste gas treatment device for the methyl acetate production process includes a treatment box 1 and a waste gas treatment mechanism. An air inlet pipe 2 is arranged on the top of the treatment box 1, and a sodium hydroxide solution is arranged in the treatment box 1; acidic gas in the waste gas of the methyl acetate production process is removed by the sodium hydroxide solution.

[0023] The exhaust gas treatment mechanism includes an exhaust pipe 3, a filter pipe 4 and a positioning assembly. The filter pipe 4 is threadedly connected to the exhaust pipe 3. A through hole 31 is provided on one side of the exhaust pipe 3. The through hole 31 is connected to the inside of the treatment box 1. A filter plate 32 is provided in the exhaust pipe 3, and the filter plate 32 is located on the side wall of the through hole 31. A water absorption filter column 44 is provided in the filter pipe 4.

[0024] Solid particles and water in the exhaust gas can be further removed by the filter plate 32 and the water absorption filter column 44, thereby achieving comprehensive treatment of the exhaust gas.

[0025] The positioning assembly includes a sealing ring 5 and a spring 43; the sealing ring 5 is arranged between the water absorption filter column 44 and the filter plate 32; the side wall of the filter tube 4 is provided with an annular groove 41, and a limiting ring 42 is arranged in the annular groove 41; the side wall of the sealing ring 5 is provided with a convex ring 51, and the convex ring 51 is arranged in the annular groove 41; one end of the spring 43 is connected to the bottom of the annular groove 41, and the other end abuts on the convex ring 51; the limiting ring 42 limits the convex ring 51.

[0026] The sealing ring 5 and the spring 43 are used in combination to make the seal between the water absorption filter column 44 and the filter plate 32 tighter, thereby preventing the exhaust gas from leaking during the filtering process. At the same time, the filter tube 4 is threadedly connected to the exhaust pipe 3, so that the filter plate 32 can be quickly cleaned or replaced. After the filter tube 4 is opened, the spring 43 is limited by the limit ring 42 to prevent the sealing ring 5 from falling off.

[0027] A mounting ring 6 is disposed on the outer peripheral wall of the filter tube 4 , one end of the exhaust pipe 3 is disposed in the mounting ring 6 , and a sealing ring 61 is disposed between the exhaust pipe 3 and the mounting ring 6 .

[0028] The installation ring 6 provides an installation position for the sealing ring 61, and also helps to fix the exhaust pipe 3 and the filter tube 4 so that they can be stably connected together to avoid loose connection or misalignment due to vibration or other factors during use.

[0029] The inner circle size of the sealing ring 5 is smaller than the opening size of the filter tube 4 , and the sealing ring 5 limits the water absorption filter column 44 .

[0030] Because the inner ring size of the sealing ring 5 is smaller than the opening size of the filter tube 4, the sealing ring 5 can fit tightly at the opening of the filter tube 4, which limits the water absorption filter column 44 and ensures that the water absorption filter column 44 is firmly fixed in the filter tube 4 without displacement or falling off, thereby improving stability. At the same time, when the exhaust pipe 3 is opened to clean or replace the filter plate 32, the sealing ring 5 can release the lock on the water absorption filter column 44 under the elastic force of the spring 43, which also facilitates the replacement of the water absorption filter column 44.

[0031] The top of the treatment box 1 is provided with a liquid inlet 11, and the side wall of the treatment box 1 is provided with a liquid outlet 12; a leakage plate 13 is provided in the treatment box 1, and one end of the air inlet pipe 2 passes through the leakage plate 13 and is connected to a serpentine pipe 21, and the serpentine pipe 21 is provided with a plurality of air holes 22.

[0032] The liquid inlet 11 and the liquid outlet 12 are provided to facilitate replacement of the sodium hydroxide solution. The orifice plate 13 is designed so that the gas can be discharged in a distributed manner. The serpentine tube 21 increases the contact area and time between the waste gas and the solution, thereby improving the waste gas treatment efficiency.

[0033] A one-way valve 7 is provided at the outlet end of the filter tube 4 .

[0034] The one-way valve 7 can be provided to control the flow direction of the gas, thereby ensuring that the gas is fully filtered and processed in the filter tube 4 and then discharged smoothly, thereby preventing the gas from flowing back.

[0035] The working principle of the utility model is as follows: firstly, sodium hydroxide solution is injected into the treatment box 1 through the liquid inlet 11, and the waste gas in the production process of methyl ester is introduced into the treatment box 1 through the air inlet pipe 2 through the air pump and other devices, and the waste gas is discharged through the air vent 22 of the serpentine pipe 21, and a neutralization reaction occurs when the waste gas contacts with the sodium hydroxide solution. The reacted gas passes through the leak plate 13 and the through hole 31 and enters the exhaust pipe 3, and the solid particles and moisture in the waste gas are further removed under the action of the filter plate 32 and the water absorption filter column 44. Through the coordinated use of the sealing ring 5 and the spring 43, the seal between the water absorption filter column 44 and the filter plate 32 is made tighter, and the leakage of the waste gas during the filtering process is prevented. At the same time, the filter plate 32 can be quickly cleaned or replaced by the threaded connection between the filter tube 4 and the exhaust pipe 3. After the filter tube 4 is opened, the sealing ring 5 can be prevented from falling by the limit ring 42 on the spring 43.

[0036] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A waste gas treatment device for a methyl acetate production process, comprising a treatment box (1) and a waste gas treatment mechanism, wherein an air inlet pipe (2) is arranged at the top of the treatment box (1), and a sodium hydroxide solution is arranged in the treatment box (1); It is characterized in that The exhaust gas treatment mechanism comprises an exhaust pipe (3), a filter pipe (4) and a positioning assembly, wherein the filter pipe (4) is threadedly connected to the inside of the exhaust pipe (3), and a through hole (31) is provided on one side of the exhaust pipe (3); the through hole (31) is communicated with the inside of the treatment box (1); a filter plate (32) is provided in the exhaust pipe (3), and the filter plate (32) is located on the side wall of the through hole (31); a water absorption filter column (44) is provided in the filter pipe (4); and the positioning assembly comprises a sealing ring (5) and a spring (43); The sealing ring (5) is arranged between the water absorption filter column (44) and the filter plate (32); The filter tube (4) has an annular groove (41) on its side wall, a limiting ring (42) is arranged in the annular groove (41), the sealing ring (5) has a convex ring (51) on its side wall, the convex ring (51) is arranged in the annular groove (41), one end of the spring (43) is connected to the bottom of the annular groove (41), and the other end abuts against the convex ring (51); the limiting ring (42) limits the convex ring (51).

2. The waste gas treatment device for methyl acetate production process according to claim 1, characterized in that: A mounting ring (6) is provided on the outer peripheral wall of the filter tube (4), one end of the exhaust pipe (3) is arranged inside the mounting ring (6), and a sealing ring (61) is provided between the exhaust pipe (3) and the mounting ring (6).

3. The waste gas treatment device for methyl acetate production process according to claim 1, characterized in that: The inner ring size of the sealing ring (5) is smaller than the opening size of the filter tube (4), and the sealing ring (5) limits the position of the water absorption filter column (44).

4. The waste gas treatment device for methyl acetate production process according to claim 1, characterized in that: The top of the processing box (1) is provided with a liquid inlet (11), and the side wall of the processing box (1) is provided with a liquid outlet (12); a leakage plate (13) is provided inside the processing box (1), and one end of the air inlet pipe (2) passes through the leakage plate (13) and is connected to a serpentine pipe (21), and the serpentine pipe (21) is provided with a plurality of air holes (22).

5. The waste gas treatment device for methyl acetate production process according to claim 1, characterized in that: A one-way valve (7) is provided at the outlet end of the filter tube (4).

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