Phoxim tail gas treatment device

Abstract

The utility model provides a phoxim tail gas treatment device. The phoxim tail gas treatment device comprises a condensation kettle, an alkaline washing tower, a water seal tank and a tail gas treatment device which are sequentially connected in series, the condensation kettle is also sequentially connected with an acid water storage tank and a neutralizing tower; the alkaline washing towers are connected into a loop through a circulating pump, and the output end of the circulating pump is connected with the alkaline washing towers through a first valve and connected with the neutralizing tower through a second valve; the neutralizing towers are connected into a loop through a second circulating pump. According to the device, the phoxim tail gas is purified and then discharged through cooperative use of the equipment, meanwhile, the arranged neutralizing tower can neutralize waste water generated in the phoxim synthesis process and the tail gas treatment process, and therefore the device has the advantages that the waste liquid treatment cost is reduced, and the device is environmentally friendly. The method overcomes the defects of incomplete absorption and complex subsequent treatment caused by the fact that only water is adopted to absorb the tail gas in a traditional phoxim synthesis tail gas treatment mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pesticide production, in particular to a phoxim tail gas treatment device. BACKGROUND

[0002] Phoxim is also called oxon, nitril oxime methyl, and its chemical name is O-alpha cyano imino O, O-diethyl phosphorothioate. It is a highly efficient, low-toxicity and broad-spectrum organophosphorus insecticide. It is mainly generated by adding a mixture of hydrochloric acid and ethanol to an aqueous sodium nitrite solution to generate ethyl nitrite. Ethyl nitrite reacts with sodium hydroxide to generate alpha-cyanophenyl methyl oxime sodium, and then condenses with O, O-diethyl phosphorothioyl chloride to generate phoxim.

[0003] In the process of condensation to obtain phoxim, alpha-cyanophenyl methyl oxime sodium is mixed with 30wt% hydrochloric acid to have a pH of 1-2, and is allowed to stand. The lower acid water is separated, a brownish yellow oil layer is obtained, and alkali is added dropwise to have a pH of 10-11. O, O-diethyl phosphorothioyl chloride is added to form a homogeneous phase, and the temperature is raised to about 45°C for reaction. Phoxim can be obtained. In this process, the tail gas contains hydrochloric acid (i.e. HCl), nitrogen oxides and a small amount of methanol. Because the impurities in the above-mentioned tail gas are easily dissolved in water, the traditional way is to treat the tail gas generated in the synthesis of phoxim by water washing. However, due to the limited water washing capacity, the absorption is not complete, and subsequent multiple processes are still required for treatment. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a phoxim tail gas treatment device to solve the problem of incomplete absorption and complex subsequent treatment caused by the existing water washing method for treating the tail gas generated in the synthesis of phoxim.

[0005] The present application provides a phoxim tail gas treatment device, which comprises a condensation kettle, an alkali washing tower, a water seal tank and a tail gas treatment device connected in series.

[0006] The condensation kettle is further connected with an acid water storage tank and a neutralization tower.

[0007] The alkali washing tower is connected into a loop by a circulating pump. The output end of the circulating pump is connected with the alkali washing tower through a first valve and connected with the neutralization tower through a second valve.

[0008] The neutralization tower is connected into a loop by a second circulating pump.

[0009] Optionally, the output end of the second circulating pump is connected with the neutralization tower through a third valve and connected with a salt water treatment device through a fourth valve.

[0010] Optionally, the salt water treatment device comprises an evaporator, a thickener, a crystallization kettle, a filter press and a drying tower connected in series.

[0011] The filter press is further connected with the evaporator.

[0012] Optionally, the evaporator is further connected with the fourth valve and the filter press through the heat exchanger respectively.

[0013] The heat exchange medium input end of the heat exchanger is connected with the drying tower.

[0014] Optionally, the neutralization tower comprises a tower body.

[0015] The first spray layer, the liquid receiving tray, the second spray layer, the filler layer, the heat exchange section and the liquid storage pool at the bottom are sequentially arranged in the tower body from top to bottom.

[0016] The liquid storage pool is connected with the material input end of the second circulating pump, and the second spray layer is connected with the material output end of the second circulating pump through the third valve.

[0017] The first spray layer is connected with the acid water storage tank and the second valve respectively.

[0018] Optionally, the liquid receiving tray comprises a tray body.

[0019] A plurality of through holes are formed in the bottom of the tray body, and the upper surface of each through hole is communicated with the flow guide pipe.

[0020] Optionally, the top and the bottom of the heat exchange section are separated by a partition plate, and a cavity is formed between the partition plates.

[0021] A plurality of heat exchange pipes are arranged in the cavity, the heat exchange pipes pass through the partition plates at the top and the bottom of the heat exchange section, and the heat exchange pipes connect the spaces at the two ends of the heat exchange section.

[0022] A heat exchange medium inlet and a heat exchange medium outlet are formed in the side of the tower body where the heat exchange section is located.

[0023] The device provided by the application can purify the phoxim tail gas and discharge the purified phoxim tail gas, and the neutralization tower can neutralize and treat the wastewater generated in the phoxim synthesis process and the tail gas treatment process, so that the cost of treating the wastewater is reduced and the device is environmentally friendly. The device overcomes the disadvantages of incomplete absorption and complex subsequent treatment caused by the traditional method of treating phoxim synthesis tail gas by using water absorption only. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0025] Figure 1 A schematic diagram of a phoxim tail gas treatment device provided by an embodiment of the present application is shown in FIG. 1.

[0026] Figure 2 A schematic diagram of a phoxim tail gas treatment device provided by another embodiment of the present application is shown in FIG. 2.

[0027] Figure 3 A schematic diagram of a phoxim tail gas treatment device provided by yet another embodiment of the present application is shown in FIG. 3.

[0028] Figure 4 A schematic diagram of a phoxim tail gas treatment device provided by still another embodiment of the present application is shown in FIG. 4.

[0029] Figure 5 A structural schematic diagram of a neutralization tower provided by an embodiment of the present application is shown in FIG. 5.

[0030] Figure 6 A structural schematic diagram of a first spray layer provided by an embodiment of the present application is shown in FIG. 6.

[0031] Figure 7 A structural schematic diagram of a liquid receiving tray provided by an embodiment of the present application is shown in FIG. 7.

[0032] Legend of reference signs:

[0033] 1, condensation kettle; 2, alkali washing tower; 3, water seal tank; 4, tail gas treatment device; 5, acid water storage tank; 6, neutralization tower; 7, brine treatment device; 20, circulating pump; 60, second circulating pump; 61, tower body; 62, first spray layer; 63, liquid receiving tray; 64, second spray layer; 65, filler layer; 66, heat exchange section; 67, liquid storage pool; 71, evaporator; 72, thickener; 73, crystallization kettle; 74, filter press; 75, drying tower; 76, heat exchanger; 100, first valve; 200, second valve; 300, third valve; 400, fourth valve; 621, acid supply pipe; 622, alkali supply pipe; 623, first liquid supply pipe; 624, second liquid supply pipe; 625, first spray head; 626, second spray head; 631, tray body; 632, flow guide pipe; 661, partition plate; 662, heat exchange pipe. DETAILED DESCRIPTION

[0034] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are clearly and completely described below. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] As shown in Figure 1 The present application provides a phoxim tail gas treatment device, which comprises a condensation kettle 1, an alkali washing tower 2, a water seal tank 3 and a tail gas treatment device 4 connected in sequence.

[0036] The condensation kettle 1 is further connected with an acid water storage tank 5 and a neutralization tower 6 in sequence.

[0037] The alkali washing tower 2 is connected into a loop through a circulating pump 20. The output end of the circulating pump 20 is connected with the alkali washing tower 2 through a first valve 100 and connected with the neutralization tower 6 through a second valve 200.

[0038] The neutralization tower 6 is connected into a loop through a second circulating pump 60.

[0039] In use, the second valve 200 is closed and the first valve 100 is opened. After the reactants complete the condensation to produce phoxim in the condensation kettle 1, the generated tail gas is output from the condensation kettle 1 and transferred into the alkali washing tower 2 to travel from bottom to top, and is in countercurrent contact with the alkali liquor sprayed from the top of the alkali washing tower 2 to react and remove the acidic substances (such as hydrogen chloride and nitrogen oxides) in the tail gas. The absorption liquid absorbing the acidic substances falls into the corresponding receiving pool at the bottom of the tower and is then circulated to the top of the tower by the first circulating pump 20 for spraying.

[0040] The tail gas washed by the alkali washing tower 2 still contains a small amount of organic substances (such as methanol). These gases are introduced into the water seal tank 3, and the water in the water seal tank 3 is used to absorb and remove the alcohol organic substances in the tail gas. The tail gas washed by water is introduced into the tail gas treatment device 4 for centralized treatment. The tail gas treatment device 4 is, for example, a incinerator, and the tail gas can be introduced into the incinerator for incineration and harmless treatment.

[0041] In the condensation reaction, ethyl nitrite (insoluble in water) is first adjusted to pH 2-3 by hydrochloric acid, and after a period of reaction, the liquid is separated, and the acid water layer is separated and transferred into the acid water storage tank 5.

[0042] When the absorption liquid in the alkali washing tower 2 is absorbed to a certain extent, the first valve 100 is closed, the second valve 200 is opened, the absorption liquid (at this time, in alkaline) in the alkali washing tower 2 is introduced into the neutralization tower 6 to neutralize the acid water transferred from the acid water storage tank 5, and the second circulating pump 60 is arranged to circulate and spray the neutralization liquid, so that the acid water and the alkaline absorption liquid can be fully neutralized.

[0043] The application provides a phoxim tail gas treatment device, which removes the acidic substances in the tail gas generated in the phoxim synthesis process through the alkali washing tower 2, and further removes the alcohol organic substances mixed in the tail gas through the water seal tank 3 arranged simultaneously, and finally discharges the tail gas after alkali washing and water washing into the tail gas treatment device for harmless treatment. In addition, the neutralization tower 6 is arranged in the scheme, the alkaline absorption liquid generated in the alkali washing process is neutralized with the acid water generated in the phoxim synthesis process in the neutralization tower 6, and the waste water generated in the treatment process of the tail gas is removed. The device of the application discharges the purified phoxim tail gas through the cooperation of the above-mentioned devices, and the neutralization tower 6 arranged simultaneously can neutralize and treat the waste water generated in the phoxim synthesis process and the treatment process of the tail gas, so that the device has the characteristics of reducing the treatment cost of waste liquid and being friendly to the environment. The device overcomes the defects of incomplete absorption and complex subsequent treatment caused by the fact that only water is used to absorb the tail gas in the traditional phoxim synthesis tail gas treatment mode.

[0044] As shown in Figure 2 Optionally, the output end of the second circulating pump 60 is connected with the neutralization tower 6 through the third valve 300 and connected with the salt water treatment device 7 through the fourth valve 400.

[0045] In the application, when the liquid level of the neutralization liquid (i.e. salt water) in the neutralization tower 6 reaches a certain value, the third valve 300 is closed and the fourth valve 400 is opened to transfer the neutralization liquid to the salt water treatment device 7 for treatment.

[0046] As shown in Figure 3 Optionally, the salt water treatment device 7 comprises an evaporator 71, a thickener 72, a crystallization kettle 73, a filter press 74 and a drying tower 75 connected in sequence.

[0047] The filter press 74 is further connected with the evaporator 71.

[0048] In the application, the transferred neutralization liquid is evaporated and concentrated in the evaporator 71, the concentrated liquid is further settled and concentrated in the thickener 72, the concentrated neutralization liquid is transferred to the crystallization kettle 73 for crystallization, the obtained crystal slurry is transferred to the filter press 74 for dehydration by pressure filtration, the filter cake (i.e. salt) is transferred to the drying tower 75 for drying, and the filtrate obtained by the pressure filtration of the filter press 74 is combined with the neutralization liquid output from the neutralization tower 6 and transferred to the evaporator 71 for further treatment.

[0049] As Figure 4 shown, the evaporator 71 is also connected with the fourth valve 400 and the filter press 74 through the heat exchanger 76 respectively.

[0050] The heat exchange medium input end of the heat exchanger 76 is connected with the drying tower 75.

[0051] In the present application, the neutralized liquid is exchanged with the wet heat steam discharged from the drying tower 75 through the heat exchanger 76 to preheat the neutralized liquid, and the preheated neutralized liquid is evaporated and concentrated in the evaporator 71, the concentrated liquid is further concentrated in the thickener 72, the concentrated neutralized liquid is transferred into the crystallizer 73 for crystallization, the obtained crystal slurry is transferred into the filter press 74 for dehydration, the filter cake, i.e. salt, is transferred into the drying tower 75 for drying, the secondary steam generated by evaporation of water in the filter cake in the drying process is transferred into the heat exchanger 76 for heat exchange and utilization, and the filtrate obtained by the filter press 74 is combined with the neutralized liquid output from the neutralization tower 6 and transferred into the evaporator 71 for further treatment.

[0052] As Figure 5 shown, the neutralization tower 6 comprises a tower body 61.

[0053] The first spray layer 62, the liquid receiving tray 63, the second spray layer 64, the filler layer 65, the heat exchange section 66 and the liquid storage pool 67 at the bottom are sequentially arranged in the tower body 61 from top to bottom.

[0054] The liquid storage pool 67 is connected with the material input end of the second circulating pump 60, and the second spray layer 64 is connected with the material output end of the second circulating pump 60 through the third valve 300.

[0055] The first spray layer 62 is connected with the acid water storage tank 5 and the second valve 200 respectively.

[0056] As Figure 6 shown, in the present application, the first spray layer 62 is used for spraying acid water and alkaline absorption liquid, and the first spray layer 62 comprises an annular outer pipe connected by an acid supply pipe 621 and an alkali supply pipe 622 which are not communicated with each other; one side of the acid supply pipe 621 is provided with an acid water input port, the inner side of the acid supply pipe 621 is communicated by a plurality of parallel arranged first liquid supply pipes 623, the lower surface of the first liquid supply pipe 623 is communicated with a first spray head 625, and the spraying direction of the first spray head 625 is inclined downwardly toward the direction of the alkali supply pipe 622; similarly, one side of the alkali supply pipe 622 is provided with an alkali input port, the inner side of the alkali supply pipe 622 is communicated by a plurality of parallel arranged second liquid supply pipes 624, the lower surface of the second liquid supply pipe 624 is communicated with a second spray head 626, and the spraying direction of the second spray head 626 is inclined downwardly toward the direction of the acid supply pipe 621. That is, the spraying direction of the acid liquid is opposite to that of the alkali liquid and both are inclined downwardly to facilitate the mixing of the sprayed acid liquid and alkali liquid.

[0057] In the application, when neutralizing in the neutralizing tower 6, the third valve 300 is opened, the fourth valve 400 is closed, the acid water is output from the acid water storage tank 5, enters the acid liquid input end of the first spray layer 62 and sprays downward, at the same time, the alkaline absorption liquid output from the alkali washing tower 2 is input from the alkali liquid input end of the first spray layer 62 and sprays downward, the spraying direction of the acid water is toward the direction of the alkali liquid input, similarly, the spraying direction of the alkaline absorption liquid is toward the direction of the acid water input, the two kinds of liquids are sprayed and contacted to react, when the sprayed liquids fall into the liquid receiving disc 63, further mixing and reaction, and then fall down, when the falling liquids enter the filler layer 65, due to the action of the filler (the filler is a Pall ring filler or a Rasching ring filler or a stepped filler or a corrugated filler), the acid water and the alkaline absorption liquid are further mixed and fully reacted, since the temperature of the acid and alkali is increased in the neutralization process, the neutralizing liquid falling through the heat exchange section 66 is heat exchanged and cooled, the neutralizing liquid after heat exchange and cooling falls into the liquid storage pool 67 at the bottom, and then is pumped into the second spray layer 64 by the second circulating pump 60 to be sprayed and circulated, so that the acid and alkali in the neutralizing liquid can be further neutralized, and the liquids sprayed from the first spray layer 62 can be cooled.

[0058] As shown in Figure 7 , optionally, the liquid receiving disc 63 comprises a disc body 631.

[0059] A plurality of through holes are formed in the bottom of the disc body 631, and the upper surface of each through hole is in communication with the flow guide pipe 632.

[0060] In the application, when the sprayed liquids fall into the liquid receiving disc 63, due to the vertical arrangement of the flow guide pipe 632, the acid water and the alkaline absorption liquid are accumulated in the liquid receiving disc 63, and at the same time, the two liquids continue to react in the accumulation process, until the liquid surface is higher than the height of the flow guide pipe 632, the liquids can enter the flow guide pipe 632 and then fall down. The height of the flow guide pipe 632 is lower than the height of the edge of the disc body 631.

[0061] As shown in Figure 5 , optionally, the top and the bottom of the heat exchange section 66 are separated by a partition plate 661, and a cavity is formed between the partition plates 661.

[0062] A plurality of heat exchange pipes 662 are arranged in the cavity, the heat exchange pipes 662 pass through the partition plates 661 at the top and the bottom of the heat exchange section 66, and connect the spaces at the two ends of the heat exchange section 66.

[0063] The side surface of the tower body 61 where the heat exchange section 66 is arranged is provided with a heat exchange medium inlet and a heat exchange medium outlet.

[0064] In the application, when used, the temperature of the acid and the base will rise during the neutralization process, so when the neutralization liquid falls through the heat exchange section 66, it enters the heat exchange tube 662, exchanges heat with the cooling water in the shell side to reduce the temperature, and the neutralized liquid after heat exchange falls into the liquid storage tank 67 at the bottom of the tower.

[0065] A phoxim tail gas treatment device, the working process is as follows:

[0066] In use, first close the second valve 200 and open the first valve 100, after the condensation kettle 1 completes the condensation of phoxim, the generated tail gas is output from the condensation kettle 1, and is transferred to the alkali washing tower 2 to travel from bottom to top, and is contacted with the alkali liquid sprayed from the top of the alkali washing tower 2, so that the acidic substances (such as hydrogen chloride and nitrogen oxides) in the tail gas are removed, and the absorption liquid that has absorbed the acidic substances falls into the corresponding receiving pool at the bottom of the tower, and then is circulated to the top of the tower by the first circulating pump 20 for spraying.

[0067] After washing in the alkali washing tower 2, the tail gas still contains a small amount of organic matter (such as methanol), which is introduced into the water seal tank 3, and the water in the water seal tank 3 is used to absorb and remove the alcohol organic matter in the tail gas, and then the washed tail gas is introduced into the tail gas treatment device 4 for centralized treatment, and the tail gas treatment device 4 is, for example, a incinerator, which can be used to incinerate the tail gas for harmless treatment.

[0068] When the condensation reaction is carried out, the ethyl nitrite (insoluble in water) is first adjusted to pH 2-3 by hydrochloric acid, and after a period of reaction, the liquid is separated, and the acid water layer is separated and transferred to the acid water storage tank 5.

[0069] When the absorption liquid in the alkali washing tower 2 is absorbed to a certain extent, the first valve 100 is closed and the second valve 200 is opened, and the absorption liquid (alkaline at this time) in the alkali washing tower 2 is introduced into the neutralization tower 6 by the first circulating pump 20 to neutralize the acid water transferred from the acid water storage tank 5.

[0070] When the neutralization is carried out in the neutralization tower 6, the third valve 300 is opened, the fourth valve 400 is closed, the acid water is output from the acid water storage tank 5, enters the acid liquid input end of the first spray layer 62 and sprays downward, at the same time, the alkaline absorption liquid output from the alkali washing tower 2 enters the alkali liquid input end of the first spray layer 62 and sprays downward, the spraying direction of the acid water is toward the alkali liquid input direction, similarly, the spraying direction of the alkaline absorption liquid is toward the acid water input direction, the two liquids are sprayed and contacted to react, when the sprayed liquid falls into the liquid collecting disc 63, due to the vertical arrangement of the flow guide pipe 632, the acid water and the alkaline absorption liquid are accumulated in the liquid collecting disc 63, at the same time, the two liquids continue to react during the accumulation, until the liquid surface of the accumulation is higher than the flow guide pipe 632, the liquid can enter the flow guide pipe 632 and then falls down, when the falling liquid enters the filler layer 65, due to the action of the filler (the filler is a Pall ring filler or a Rasching ring filler or a stepped filler or a corrugated filler), the acid water and the alkaline absorption liquid are further mixed and fully reacted, since the temperature of the acid and alkali is increased during the neutralization, when the neutralization liquid falling through the filler layer 65 enters the heat exchange pipe 662, the heat exchange pipe 662 exchanges heat with the cooling water in the shell side to reduce the temperature, the neutralization liquid after the heat exchange and temperature reduction falls into the liquid storage tank 67 at the bottom, and then is pumped into the second spray layer 64 by the second circulating pump 60 to be sprayed and circulated, so that the acid and alkali in the neutralization liquid can be further reacted and neutralized, and the liquid sprayed from the first spray layer 62 can be cooled.

[0071] When the liquid level in the liquid storage tank 67 reaches a certain value, the third valve 300 is closed and the fourth valve 400 is opened to output the neutralization liquid, the output neutralization liquid exchanges heat with the wet hot steam discharged from the drying tower 75 in the heat exchanger 76 to preheat the neutralization liquid, the preheated neutralization liquid enters the evaporator 71 to be evaporated and concentrated, the concentrated liquid is further settled and concentrated in the thickener 72, the concentrated neutralization liquid is transferred into the crystallization kettle 73 to be crystallized, the crystal slurry is transferred into the filter press 74 to be dewatered by pressure filtration. The filter cake, i.e. salt, is transferred into the drying tower 75 to be dried, the secondary steam generated by the evaporation of the water in the filter cake during the drying process is transferred into the heat exchanger 76 to be exchanged and utilized. The filtrate obtained by the pressure filtration of the filter press 74 is combined with the neutralization liquid output from the neutralization tower 6 and transferred into the evaporator 71 to be treated again.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or part or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A phoxim tail gas treatment device, characterized by comprising: The condensation kettle (1), the alkali washing tower (2), the water sealing groove (3) and the tail gas treatment device (4) are connected in sequence. The condensation kettle (1) is further connected with the acid water storage tank (5) and the neutralization tower (6) in sequence. The alkali washing tower (2) is connected into a loop through a circulating pump (20), the output end of the circulating pump (20) is connected with the alkali washing tower (2) through a first valve (100) and connected with the neutralization tower (6) through a second valve (200). The neutralization tower (6) is connected into a loop through a second circulating pump (60).

2. The phoxim tail gas treatment device according to claim 1, characterized by, The output end of the second circulating pump (60) is connected with the neutralization tower (6) through a third valve (300) and connected with the salt water treatment device (7) through a fourth valve (400).

3. The phoxim tail gas treatment device according to claim 2, characterized in that, The salt water treatment device (7) comprises an evaporator (71), a thickener (72), a crystallization kettle (73), a filter press (74) and a drying tower (75) connected in sequence. The filter press (74) is further connected with the evaporator (71).

4. The phoxim tail gas treatment device according to claim 3, characterized in that, The evaporator (71) is further connected with the fourth valve (400) and the filter press (74) through a heat exchanger (76). The heat exchange medium input end of the heat exchanger (76) is connected with the drying tower (75).

5. The phoxim tail gas treatment device according to any one of claims 1 to 4, characterized in that, The neutralization tower (6) comprises a tower body (61). The tower body (61) is sequentially provided with a first spraying layer (62), a liquid receiving disc (63), a second spraying layer (64), a filler layer (65), a heat exchange section (66) and a liquid storage pool (67) at the bottom from top to bottom. The liquid storage pool (67) is connected with the material input end of the second circulating pump (60), and the second spraying layer (64) is connected with the material output end of the second circulating pump (60) through the third valve (300). The first spraying layer (62) is connected with the acid water storage tank (5) and the second valve (200) respectively.

6. The phoxim tail gas treatment device according to claim 5, characterized in that, The liquid receiving disc (63) comprises a disc body (631). A plurality of through holes are formed in the bottom of the disc body (631), and the upper surface of each through hole is communicated with a flow guide pipe (632).

7. The phoxim tail gas treatment device according to claim 5, characterized by, The top and bottom of the heat exchange section (66) are separated by a partition plate (661), and a cavity is formed between the partition plates (661). A plurality of heat exchange pipes (662) are arranged in the cavity, the heat exchange pipes (662) pass through the partition plates (661) at the top and bottom of the heat exchange section (66) and communicate the spaces at both ends of the heat exchange section (66). The tower body (61) in which the heat exchange section (66) is arranged is provided with a heat exchange medium inlet and a heat exchange medium outlet on the side surface.

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