Phosphorus washing tower structure for phosphorus trichloride production

Abstract

The utility model discloses a phosphorus trichloride production phosphorus washing tower structure, which comprises a tower body, a gas inlet, a gas distribution cover, a packing layer, a liquid inlet, a liquid distributor, a gas outlet and a liquid outlet, the gas inlet is arranged on the side wall of the bottom end of the tower body, the gas distribution cover is connected with the gas inlet, the liquid inlet is arranged on the side wall of the upper end of the tower body, the liquid distributor is connected with the liquid inlet, and the gas outlet is connected with the packing layer. The liquid outlet is formed in the bottom of the tower body; the filler layer is mounted below the liquid distributor; the upper end of the gas distribution cover is sealed, and the lower end of the gas distribution cover is connected with the gas inlet; the packing layer comprises an upper packing layer and a lower packing layer, and a circulating liquid distributor is further mounted between the upper packing layer and the lower packing layer; according to the utility model, the two packing layers are arranged, and the gas outlet seam of the gas distribution cover is arranged on the side surface, so that gas rotationally ascends in the phosphorus washing tower and is fully contacted with liquid sprayed by the liquid distributor and the circulating liquid distributor in the two packing layers for washing, impurities in phosphorus trichloride gas are reduced, and the reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphorus washing tower structures, in particular to a phosphorus washing tower structure for phosphorus trichloride production. Background Art

[0002] Phosphorus scrubbing towers are one of the main equipment for producing phosphorus trichloride. Different tower structures have different gas-liquid interface surfaces, resulting in varying effects. Currently, most domestic companies producing phosphorus trichloride use traditional packed towers. A liquid distributor is installed at the top of the packed tower, through which reflux liquid is distributed to the packing. Liquid flows downward through the packing, while gas evaporates upward from the bottom of the tower, causing the gas and liquid phases to intersect in the packing layer in a countercurrent manner, separating small solid particles and those with different boiling points in the gas. While achieving effective phosphorus scrubbing, traditional packed towers rely solely on the packing layer for gas-liquid countercurrent motion, mass transfer, and heat transfer, resulting in absorption and separation. Free phosphorus from the chlorination reaction cannot be fully interfused and cleaned, and small particles and free phosphorus are easily carried along the tower wall or entrained with gas from top to bottom, condensing into the finished phosphorus trichloride liquid product through a condenser. To address this problem, the present utility model provides a solution. Utility Model Content

[0003] The utility model aims to provide a phosphorus washing tower structure for producing phosphorus trichloride.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A phosphorus trichloride production phosphorus washing tower structure comprises a tower body, an air inlet, an air distribution hood, a packing layer, a liquid inlet, a liquid distributor, an air outlet and a liquid outlet, wherein the air inlet is arranged on the side wall of the bottom end of the tower body, the air distribution hood is connected to the air inlet, the liquid inlet is arranged on the side wall of the upper end of the tower body, the liquid distributor is connected to the liquid inlet, the liquid outlet is arranged at the bottom of the tower body, the packing layer is installed below the liquid distributor, the air outlet is arranged at the top of the tower body, and the air distribution hood is a cylindrical structure; the upper end of the air distribution hood is sealed, the lower end is connected to the air inlet, and the side surface is provided with evenly distributed air outlet slots; the packing layer comprises an upper packing layer and a lower packing layer, a circulating liquid distributor is further installed between the upper and lower packing layers, the circulating liquid distributor is connected to the bottom of the tower body via a circulating pipe, and a circulating pump is installed on the circulating pipe.

[0006] Furthermore, the air distribution hood includes a base, a swirl plate and an upper cover plate. The two ends of the swirl plate are respectively connected to the base and the upper cover plate. The multiple swirl plates are inclined and evenly arranged. Two adjacent swirl plates form an air outlet gap. The center position of the bottom of the base is connected to the air inlet through a pipe, so that the airflow coming out of the air outlet gap can slowly rotate and rise.

[0007] Furthermore, an adsorption layer is provided on the top of the tower body, and the adsorption layer is filled with adsorption material, and the adsorption material is a porous ceramic material.

[0008] Furthermore, the lower packing layer and the upper packing layer are both filled with multiple layers of packing, and different layers are filled with different packings, and different ceramic packings can be selected. The structure can be selected from Raschig rings, Pall rings, stepped rings, etc.

[0009] Furthermore, a valve is installed on the circulation pipe, and the valve is installed at the liquid inlet end of the circulation pump.

[0010] Furthermore, the swirl plate is a spiral curved plate, and after the gas is discharged from the gas outlet slit, it can effectively form a spiral airflow, slow down its rising speed, and increase the contact time and area between the gas and the liquid.

[0011] In summary, the utility model has the following beneficial effects: the utility model provides two layers of packing and arranges the air outlet slit of the gas distribution hood on the side, so that the gas rotates and rises in the phosphorus washing tower, and is fully contacted and washed with the liquid sprayed by the liquid distributor and the circulating liquid distributor in the two layers of packing, thereby reducing impurities in the phosphorus trichloride gas and improving the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a side view of the utility model air cloth hood;

[0014] Figure 3 It is a cross-sectional view of the utility model cloth air hood.

[0015] In the figure, 1. tower body; 2. air inlet; 3. air distribution hood; 4. lower packing layer; 5. upper packing layer; 6. liquid inlet; 7. liquid distributor; 8. adsorption layer; 9. air outlet; 10. liquid outlet; 11. circulation pipe; 12. circulation pump; 13. circulation liquid distributor; 14. valve; 15. base; 16. swirl plate; 17. upper cover. DETAILED DESCRIPTION

[0016] The following is a further detailed description of the present invention in conjunction with the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] like Figure 1-3As shown, a phosphorus trichloride production phosphorus washing tower structure includes a tower body 1, an air inlet 2, an air distribution hood 3, a packing layer, a liquid inlet 6, a liquid distributor 7, an air outlet 9 and a liquid outlet 10, wherein the air inlet 2 is arranged on the side wall of the bottom end of the tower body 1, the air distribution hood 3 is connected to the air inlet 2, the liquid inlet 6 is arranged on the side wall of the upper end of the tower body 1, the liquid distributor 7 is connected to the liquid inlet 6, the liquid outlet 10 is arranged at the bottom of the tower body 1, the packing layer is installed below the liquid distributor 7, and the air outlet 9 is arranged at the bottom of the tower body 1. At the top, the air distribution hood 3 is a cylindrical structure; the upper end of the air distribution hood 3 is sealed, the lower end is connected to the air inlet 2, and the side is provided with evenly distributed air outlet slots; the packing layer includes an upper packing layer 5 and a lower packing layer 4, and a circulating liquid distributor 13 is also installed between the upper packing layer 5 and the lower packing layer 4. The circulating liquid distributor 13 is connected to the bottom of the tower body 1 through a circulating pipe 11, and a circulating pump 12 is installed on the circulating pipe 11. The phosphorus washing liquid enters the circulating liquid distributor 13 through the circulating pump 12 and the circulating pipe 11 for secondary utilization.

[0018] Further, such as Figure 2 and Figure 3 As shown, the air distribution hood 3 includes a base 15, a swirl plate 16 and an upper cover plate 17. The two ends of the swirl plate 16 are respectively connected to the base 15 and the upper cover plate 17. The multiple swirl plates 16 are inclined and evenly arranged. Two adjacent swirl plates 16 form an air outlet gap. The center position of the bottom of the base 15 is connected to the air inlet 2 through a pipe, so that the airflow coming out of the air outlet gap can slowly rotate and rise.

[0019] Furthermore, an adsorption layer 8 is provided on the top of the tower body 1 , and the adsorption layer 8 is filled with adsorption material, and the adsorption material is a porous ceramic material.

[0020] Furthermore, the lower packing layer 4 and the upper packing layer 5 are both filled with multiple layers of packing, and different layers are filled with different packings, and different ceramic packings can be selected. The structure can be selected from Raschig rings, Pall rings, stepped rings, etc.

[0021] Furthermore, a valve 14 is installed on the circulation pipe 11 , and the valve 14 is installed at the liquid inlet end of the circulation pump 11 .

[0022] Furthermore, the swirl plate 16 is a spiral curved plate, and after the gas is discharged from the gas outlet slit, it can effectively form a spiral airflow, slow down its rising speed, and increase the contact time and area between the gas and the liquid.

[0023] Working principle: Phosphorus trichloride gas enters the gas distribution hood 3 from the air inlet 2, and then the gas rotates and rises under the action of the gas distribution hood 3, and fully contacts and reacts with the phosphorus washing liquid sprayed by the liquid distributor 7 and the circulating liquid distributor 13 in the packing layer. The circulation pipe 11 and the circulation pump 12 repeatedly react the phosphorus washing liquid at the bottom of the tower body 1 with the gas. The reacted gas is adsorbed by the adsorption layer and finally discharged from the gas outlet.

[0024] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A phosphorus trichloride production phosphorus washing tower structure, comprising a tower body (1), an air inlet (2), an air distribution hood (3), a packing layer, a liquid inlet (6), a liquid distributor (7), an air outlet (9) and a liquid outlet (10), wherein the air inlet (2) is arranged on the side wall of the bottom end of the tower body (1), the air distribution hood (3) is connected to the air inlet (2), the liquid inlet (6) is arranged on the side wall of the upper end of the tower body (1), the liquid distributor (7) is connected to the liquid inlet (6), the liquid outlet (10) is arranged at the bottom of the tower body (1), the packing layer is installed below the liquid distributor (7), and the air outlet (9) is arranged at the top of the tower body (1), characterized in that: The air distribution hood (3) is a cylindrical structure; the upper end of the air distribution hood (3) is sealed, the lower end is connected to the air inlet (2), and the side surface is provided with evenly distributed air outlet slits; the packing layer comprises an upper packing layer (5) and a lower packing layer (4), a circulating liquid distributor (13) is further installed between the upper packing layer (5) and the lower packing layer (4), the circulating liquid distributor (13) is connected to the bottom of the tower body (1) through a circulating pipe (11), and a circulating pump (12) is installed on the circulating pipe (11).

2. A phosphorus washing tower structure for producing phosphorus trichloride according to claim 1, characterized in that: The air distribution hood (3) comprises a base (15), a swirl plate (16) and an upper cover plate (17); the two ends of the swirl plate (16) are respectively connected to the base (15) and the upper cover plate (17); the plurality of swirl plates (16) are tilted and evenly arranged; two adjacent swirl plates (16) form an air outlet gap; the center position of the bottom of the base (15) is connected to the air inlet (2) through a pipeline.

3. A phosphorus washing tower structure for producing phosphorus trichloride according to claim 2, characterized in that: An adsorption layer (8) is provided on the top of the tower body (1), and the adsorption layer (8) is filled with adsorption material.

4. A phosphorus washing tower structure for producing phosphorus trichloride according to claim 3, characterized in that: The lower packing layer (4) and the upper packing layer (5) are both filled with multiple layers of packing, with different packings selected for different layers.

5. A phosphorus washing tower structure for producing phosphorus trichloride according to claim 4, characterized in that: A valve (14) is installed on the circulation pipe (11), and the valve (14) is installed at the liquid inlet end of the circulation pump (12).

6. A phosphorus washing tower structure for phosphorus trichloride production according to claim 2, characterized in that: The swirl plate (16) is a spiral curved plate.

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