Raw material loading and unloading device for chloroacetic acid production

Abstract

The utility model relates to the technical field of chloroacetic acid production, and discloses a raw material loading and unloading device for chloroacetic acid production, which comprises a device cover, a motor is mounted on the upper end face of the device cover, the output end of the motor penetrates through the upper end of the device cover and is fixedly connected with a rotating shaft, and a gas self-suction paddle is fixedly sleeved on the rotating shaft. The first gear and the second gear are driven by the motor and the rotating shaft, the rotating shaft and the rotating shaft drive the stirring blades and the gas self-suction type paddles to rotate, the lower stirring blades scatter chlorine bubbles firstly, the gas self-suction type paddles break the chlorine bubbles into small bubbles, the upper stirring blades conduct stirring again, and the chlorine bubbles are stirred through the gas self-suction type paddles. Through cooperation of the stirring blades and the gas self-suction paddles, the contact area of chlorine, acetic acid and a catalyst is increased, insufficient chlorination depth or excessive chlorination caused by non-uniform distribution of chlorine is avoided, the reaction efficiency is high, the reaction time is short, reaction byproducts and residues are reduced, the conversion rate of vinyl chloride is increased, and the consumption of raw materials is low.

Description

Technical Field

[0001] The utility model relates to the technical field of chloroacetic acid production, in particular to a raw material loading and unloading device for chloroacetic acid production. Background Art

[0002] Chloroacetic acid has very extensive and important uses in the pharmaceutical, dye, cellulose processing and fine chemical industries. In industry, chloroacetic acid is generally produced by using glacial acetic acid and chlorine gas with sulfur as catalyst. However, due to the excessive chlorination of acetic acid in the production process, a large amount of waste liquid containing dichloroacetic acid and trichloroacetic acid is generated, which increases the consumption of raw materials, leads to a low yield of chloroacetic acid, poor purity and high production energy consumption. In addition, the presence of sulfur causes the by-product HCl to have low purity and a narrow application range.

[0003] In the prior art, during the production of vinyl chloride, the contact area between chlorine, acetic acid and the catalyst is too small, and the chlorine distribution is uneven, resulting in insufficient chlorination depth or over-chlorination, which leads to low reaction efficiency, long reaction time, and a large number of reaction by-products and residues, resulting in a low vinyl chloride conversion rate and a large raw material consumption. In addition, since mother liquor still remains on the inner wall of the device after chlorination, the recovery rate of the mother liquor is reduced, the production consumption of chloroacetic acid is increased, and the cost is increased. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a raw material loading and unloading device for chloroacetic acid production, which has the advantages of improving the conversion rate of vinyl chloride and the recovery rate of mother liquor, reducing the consumption of raw materials, and solving the problems in the above-mentioned background technology.

[0005] The utility model provides the following technical scheme: a raw material loading and unloading device for chloroacetic acid production, comprising a device cover, an upper end surface of the device cover is installed with a motor, the output end of the motor passes through the upper end of the device cover and is fixedly connected with a rotating shaft, a gas self-priming blade is fixedly sleeved on the rotating shaft, a No. 1 gear is fixedly sleeved on the upper part of the rotating shaft, the No. 1 gear is symmetrically meshed and connected with a No. 2 gear, a rotating shaft is fixedly inserted at the center of the No. 2 gear, a stirring blade is symmetrically fixedly sleeved on the rotating shaft, the gas self-priming blade is arranged between the stirring blades, and a reaction barrel is clamped at the lower end of the device cover.

[0006] Preferably, an air outlet pipe is fixedly connected to the left inner wall of the upper end of the device cover, a feed funnel is fixedly connected to the right inner wall of the upper end of the device cover, and a sealing cover is fixedly connected to the upper end of the feed funnel.

[0007] Preferably, a stirring frame is fixedly connected to the lower end of the rotating shaft, a scraper is fixedly connected to the side wall of the stirring frame, and the scraper is made of rubber.

[0008] Preferably, the gas self-priming blade includes a baffle, a support plate is fixedly connected to the side wall of the baffle in a circular array, a partition is fixedly connected to the upper end side wall of the support plate, the other end of the partition is fixedly connected to the side wall of another support plate, a dividing hole is opened on the side wall of the baffle, and a connecting hole is opened on the side wall of the support plate.

[0009] Preferably, a heater is fixedly connected to the inner wall of the reaction barrel, a base is fixedly connected to the side wall of the reaction barrel, an output tube is fixedly connected to the inner wall at the center of the bottom end of the reaction barrel, a tube cover is meshedly connected to the right end of the output tube, and an air intake pipe is fixedly connected to the inner wall of the bottom end of the reaction barrel located on the right side of the output tube.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. The motor and the rotating shaft drive the No. 1 gear and the No. 2 gear. The rotating shaft and the rotating shaft drive the stirring blade and the gas self-priming paddle to rotate. The stirring blade at the bottom first disperses the chlorine bubbles, and the gas self-priming paddle breaks the chlorine bubbles into very small bubbles. The upper stirring blade stirs again. Through the cooperation of the stirring blade and the gas self-priming paddle, the contact area between chlorine, acetic acid and the catalyst is increased, avoiding uneven distribution of chlorine causing insufficient chlorination depth or excessive chlorination, so that the reaction efficiency is high, the reaction time is short, the reaction by-products and residues are reduced, the conversion rate of vinyl chloride is improved, and the raw material consumption is small.

[0012] 2. The stirring frame is driven by the rotating shaft, and the stirring frame drives the scraper to rotate. The scraper scrapes the residual solution on the inner wall of the reaction barrel, thereby avoiding the mother liquor remaining on the inner wall of the device after chlorination, thereby improving the recovery rate of the mother liquor, reducing the production consumption of chloroacetic acid, and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the device cover of the utility model;

[0015] Figure 3 This is a schematic diagram of the rear cross-sectional structure of the reaction barrel of the utility model;

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the device cover of the utility model;

[0017] Figure 5 This is a schematic diagram of the three-dimensional structure of the gas self-priming blade of the utility model;

[0018] Figure 6 It is a schematic diagram of the cross-sectional structure of the gas self-priming blade of the utility model.

[0019] In the figure: 1. device cover; 2. reaction barrel; 3. base; 4. output pipe; 5. air inlet pipe; 6. air outlet pipe; 7. motor; 8. feed funnel; 9. rotating shaft; 10. stirring frame; 11. scraper; 12. rotating shaft; 13. stirring blade; 14. gas self-priming blade; 141. baffle; 142. support plate; 123. partition; 15. heater; 16. gear No. 1; 17. gear No. 2. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0021] See also Figure 1-Figure 3 A raw material loading and unloading device for chloroacetic acid production comprises a device cover 1, a motor 7 is installed on the upper end surface of the device cover 1, an output end of the motor 7 passes through the upper end of the device cover 1 and is fixedly connected to a rotating shaft 9, a gas self-priming blade 14 is fixedly sleeved on the rotating shaft 9, a No. 1 gear 16 is fixedly sleeved on the upper part of the rotating shaft 9, the No. 1 gear 16 is symmetrically meshed and connected to a No. 2 gear 17, a rotating shaft 12 is fixedly inserted at the center of the No. 2 gear 17, a stirring blade 13 is symmetrically fixedly sleeved on the rotating shaft 12, and the gas self-priming blade 14 is arranged on the stirring shaft 12. The lower end of the device cover 1 is clamped with a reaction barrel 2 between the stirring blades 13. The stirring blades 13 at the lower part first disperse the chlorine bubbles, and the gas self-priming blades 14 break the chlorine bubbles into very small bubbles. The stirring blades 13 at the upper end stir again. Through the cooperation of the stirring blades 13 and the gas self-priming blades 14, the contact area between chlorine, acetic acid and the catalyst is increased, which avoids the uneven distribution of chlorine causing insufficient chlorination depth or excessive chlorination, so that the reaction efficiency is high, the reaction time is short, the reaction by-products and residues are reduced, the conversion rate of vinyl chloride is improved, and the raw material consumption is small;

[0022] An air outlet pipe 6 is fixedly connected to the inner wall on the left side of the upper end of the device cover 1, and a feed funnel 8 is fixedly connected to the inner wall on the right side of the upper end of the device cover 1. A sealing cover is fixedly connected to the upper end of the feed funnel 8. The feed funnel 8 is convenient for transporting raw materials, and the air outlet pipe 6 is convenient for extracting the gas generated by the reaction in the reaction barrel 2. The chlorine gas that is not completely reacted can be recycled, which reduces energy loss and production costs. The sealing and isolating device ensures that chlorine gas or by-products will not leak, protecting the life, health and safety of the staff;

[0023] A stirring frame 10 is fixedly connected to the lower end of the rotating shaft 9, and a scraper 11 is fixedly connected to the side wall of the stirring frame 10. The scraper 11 is made of rubber. The rotating shaft 9 drives the stirring frame 10, and the stirring frame 10 drives the scraper 11 to rotate. The scraper 11 scrapes the residual solution on the inner wall of the reaction barrel 2, thereby avoiding that the mother liquor still remains on the inner wall of the device after chlorination, so that the recovery rate of the mother liquor is improved, the production consumption of chloroacetic acid is reduced, and the cost is reduced;

[0024] See also Figure 4-Figure 5 The gas self-priming blade 14 includes a baffle 141, a support plate 142 is fixedly connected to the side wall of the baffle 141 in an annular array, a partition 143 is fixedly connected to the upper side wall of the support plate 142, and the other end of the partition 143 is fixedly connected to the side wall of another support plate 142. A dividing hole is provided on the side wall of the baffle 141, and a connecting hole is provided on the side wall of the support plate 142. When the gas self-priming blade 14 rotates at a certain speed, the gas above the liquid surface in the reactor is sucked in by the small hole at the upper end of the hollow shaft, moves downward along the hollow shaft, and bulges out from the small hole between the lower end disks. Bubbles escape from the paddle end and are broken into very small bubbles by the partition 143 on the edges of the two disks. The gas forms a cycle in the reactor, so that the internally recycled gas returns to the liquid from the upper space of the reactor, and the gas is fully in contact with the liquid.

[0025] A heater 15 is fixedly connected to the inner wall of the reaction barrel 2, a base 3 is fixedly connected to the side wall of the reaction barrel 2, an output pipe 4 is fixedly connected to the inner wall at the center of the bottom end of the reaction barrel 2, a tube cover is meshedly connected to the right end of the output tube 4, an air inlet pipe 5 is fixedly connected to the inner wall of the bottom end of the reaction barrel 2 located on the right side of the output tube 4, chlorine is input through the air inlet pipe 5, so that the chlorine can contact the glacial acetic acid at the bottom, and the mother liquor is transported by punching the tube cover after the reaction is completed.

[0026] Working principle: first add acetic acid and sulfur powder into the reaction barrel 2, heat the reaction barrel 2 through the heater 15, and chlorine enters the reaction barrel 2 from the air inlet pipe 5. Since there is already liquid in the reaction barrel 2, the air inlet pipe 5 appears in the form of bubbles when entering the reaction barrel 2. When the device is working, start the motor 7, the motor 7 drives the rotating shaft 9 to rotate, the rotating shaft 9 drives the No. 1 gear 16 to rotate, the No. 1 gear 16 drives the No. 2 gear 17 to rotate, the No. 2 gear 17 drives the rotating shaft 12 to rotate, and the rotating shaft 9 and the rotating shaft 12 drive the stirring blade 13 and the gas self-priming blade 14 rotate, the lower stirring blade 13 first disperses the chlorine bubbles, the gas self-priming blade 14 breaks the chlorine bubbles into very small bubbles, and the upper stirring blade 13 stirs again. Through the cooperation of the stirring blade 13 and the gas self-priming blade 14, the contact area between chlorine, acetic acid and the catalyst is increased, avoiding the uneven distribution of chlorine causing insufficient chlorination depth or excessive chlorination, so that the reaction efficiency is high, the reaction time is short, the reaction by-products and residues are reduced, the conversion rate of vinyl chloride is improved, and the raw material consumption is small;

[0027] After the chlorination reaction is completed, the rotating shaft 9 drives the stirring frame 10, and the stirring frame 10 drives the scraper 11 to rotate. The scraper 11 scrapes the residual solution on the inner wall of the reaction barrel 2, thereby avoiding the mother liquor remaining on the inner wall of the device after chlorination, thereby improving the recovery rate of the mother liquor, reducing the production consumption of chloroacetic acid, and reducing the cost.

Claims

1. A raw material loading and unloading device for chloroacetic acid production, comprising a device cover (1), characterized in that: The upper end surface of the device cover (1) is provided with a motor (7), the output end of the motor (7) passes through the upper end of the device cover (1) and is fixedly connected to a rotating shaft (9), a gas self-priming blade (14) is fixedly sleeved on the rotating shaft (9), a No. 1 gear (16) is fixedly sleeved on the upper part of the rotating shaft (9), the No. 1 gear (16) is symmetrically meshed and connected to a No. 2 gear (17), a rotating shaft (12) is fixedly inserted at the center of the No. 2 gear (17), a stirring blade (13) is symmetrically fixedly sleeved on the rotating shaft (12), the gas self-priming blade (14) is arranged between the stirring blades (13), and a reaction barrel (2) is clamped on the lower end of the device cover (1).

2. A raw material loading and unloading device for chloroacetic acid production according to claim 1, characterized in that: An air outlet pipe (6) is fixedly connected to the left inner wall of the upper end of the device cover (1), a feed funnel (8) is fixedly connected to the right inner wall of the upper end of the device cover (1), and a sealing cover is fixedly connected to the upper end of the feed funnel (8).

3. A raw material loading and unloading device for chloroacetic acid production according to claim 1, characterized in that: The lower end of the rotating shaft (9) is fixedly connected to a stirring frame (10), and the side wall of the stirring frame (10) is fixedly connected to a scraper (11), and the scraper (11) is made of rubber.

4. A raw material loading and unloading device for chloroacetic acid production according to claim 1, characterized in that: The gas self-priming blade (14) comprises a baffle (141), a support plate (142) is fixedly connected in an annular array on the side wall of the baffle (141), a partition (143) is fixedly connected on the upper end side wall of the support plate (142), the other end of the partition (143) is fixedly connected to the side wall of another support plate (142), a dividing hole is opened on the side wall of the baffle (141), and a connecting hole is opened on the side wall of the support plate (142).

5. A raw material loading and unloading device for chloroacetic acid production according to claim 1, characterized in that: A heater (15) is fixedly connected to the inner wall of the reaction barrel (2); a base (3) is fixedly connected to the side wall of the reaction barrel (2); an output pipe (4) is fixedly connected to the inner wall at the center of the bottom end of the reaction barrel (2); a pipe cover is meshedly connected to the right end of the output pipe (4); and an air intake pipe (5) is fixedly connected to the inner wall at the right side of the output pipe (4) at the bottom end of the reaction barrel (2).

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