Tail gas treatment device for preparing benzotriazole

Abstract

The utility model relates to a tail gas treatment device for preparing benzotriazole. The tail gas treatment device comprises a cuboid treatment barrel, a seat plate, a cover body and an exhaust pipe, wherein the seat plate is hermetically fixed at an opening in the bottom of the cuboid treatment barrel; the cover body is hermetically fixed at an opening in the top of the cuboid treatment barrel; the device further comprises an alkali liquor storage box fixed in the cuboid treatment barrel and a snakelike coil pipe transversely arranged at the lower part in the alkali liquor storage box; two detachable filter layers which are respectively distributed up and down are also arranged in the cuboid treatment barrel; each filter layer comprises a rectangular frame which is obliquely arranged and a filter plate which is fixed in the rectangular frame and is parallel to the rectangular frame; the device further comprises a neutralization assembly. According to the utility model, the acid tail gas is treated by adopting physical and chemical methods at the same time, so that the treatment effect is greatly improved; therefore, the space is saved, and the material cost is reduced; in addition, the treatment efficiency is also remarkably improved.

Description

Technical Field

[0001] The utility model relates to a tail gas treatment device for preparing benzotriazole. Background Art

[0002] Benzotriazole is mostly used as a gas-phase corrosion inhibitor for copper and copper alloys, a circulating water treatment agent for antifreeze, a photographic antifogging agent, a polymer stabilizer, a plant growth regulator, a lubricating oil additive, an ultraviolet absorber, etc. It is a chemical product in the form of colorless needle-shaped crystals; the o-phenylenediamine method is the earliest and most commonly used preparation method, and its main preparation process is as follows: First, water, pure acetic acid and o-phenylenediamine are added into a reaction device, the stirring device is started and the temperature is raised to the reaction temperature, then sodium nitrite is added for a cyclization reaction; after the cyclization reaction is completed, sulfuric acid is added for a displacement reaction to replace the sodium acetate generated by the cyclization reaction with acetic acid and sodium sulfate; after the displacement reaction is completed, sodium sulfate is continuously added, and after adding, the stirring is stopped and the mixture is allowed to stand for stratification to obtain a stratified oil phase and a stratified water phase; the obtained stratified water phase is cooled and filtered to obtain sodium sulfate crystal salt and a reaction mother liquor; the obtained stratified oil phase is distilled to recover acetic acid and recrystallized to obtain benzotriazole.

[0003] Since acetic acid needs to be added during the cyclization reaction and acetic acid needs to be displaced during the displacement reaction, and since acetic acid will volatilize, and the temperature needs to be raised during the reaction, and after the temperature is raised, a small amount of sulfuric acid will also volatilize, so an acidic tail gas with weak acidity will be formed near the reaction device; when the concentration of the acidic tail gas is too high, it will affect the normal breathing of the surrounding operators, so the acidic tail gas cannot be directly discharged, and at the same time, considering the recycling of the acidic tail gas, the acidic tail gas must be treated.

[0004] The existing tail gas treatment equipment only relies on the physical adsorption function of the filter plate, and since the adsorption capacity of a single filter plate is limited, the treatment effect is poor. In order to increase the adsorption capacity, only the number of filter plates can be increased, which in turn leads to a large increase in the volume of the tail gas treatment equipment, occupying a large amount of space and increasing the material cost; moreover, the adsorption speed of the filter plate is also slow, and it takes a long time to completely treat the acidic tail gas, so the treatment efficiency is also low and needs to be further improved. Summary of the Utility Model

[0005] Aiming at the current situation of the above-mentioned existing technology, the technical problem to be solved by the utility model is to provide a tail gas treatment device for preparing benzotriazole that simultaneously adopts physical and chemical methods to greatly improve the treatment effect, effectively reduces the volume, saves space and reduces the material cost, and also significantly improves the treatment efficiency.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is as follows: An exhaust gas treatment device for preparing benzotriazole, characterized by comprising a cuboid treatment cylinder, a seat plate hermetically fixed at the bottom opening of the cuboid treatment cylinder, a cover body hermetically fixed at the top opening of the cuboid treatment cylinder, and an exhaust pipe hermetically inserted at the top of the cover body;

[0007] On the top right side of the seat plate, a liquid collecting hopper is formed downward, and a drain pipe is also hermetically inserted at the bottom of the liquid collecting hopper;

[0008] It further includes an alkali liquid storage tank fixed inside the cuboid treatment cylinder and a serpentine coil pipe horizontally arranged below the inside of the alkali liquid storage tank. One end of the serpentine coil pipe seals and passes through the top of the alkali liquid storage tank upward and extends above the alkali liquid storage tank, and the other end of the serpentine coil pipe horizontally seals and passes through one side of the alkali liquid storage tank and extends above the liquid collecting hopper;

[0009] Two removable filter layers are respectively arranged up and down inside the cuboid treatment cylinder. The filter layer includes an inclined rectangular frame and a filter plate fixed inside the rectangular frame and parallel to the rectangular frame. The rectangular frame is set with the front higher than the rear;

[0010] It further includes a neutralization component, which includes a liquid inlet pipe vertically fixed outside the right side of the cuboid treatment cylinder, a pump body arranged inside the alkali liquid storage tank, and an atomization unit arranged between the two filter layers. The lower end of the liquid inlet pipe seals and passes through the right side of the cuboid treatment cylinder and seals and extends into the inside of the alkali liquid storage tank and is connected to the liquid outlet of the pump body;

[0011] The atomization unit includes a shunt pipe horizontally fixed inside the seat plate and a plurality of liquid outlet pipes horizontally inserted on the shunt pipe and arranged in sequence from front to back. The upper end of the liquid inlet pipe seals and extends into the inside of the cuboid treatment cylinder and is located between the two filter layers and is inserted on the shunt pipe;

[0012] Both ends of the shunt pipe are closed, and the end openings of each liquid outlet pipe are closed;

[0013] A plurality of atomizing nozzles are sequentially arranged along the length direction of the liquid outlet pipe and inserted on the lower side of each liquid outlet pipe.

[0014] Preferably, two horizontally slotted holes are respectively arranged up and down on the front outer wall of the cuboid treatment cylinder. Correspondingly, two inclined sinking grooves are respectively arranged up and down on the left and right inner walls of the cuboid treatment cylinder. Each inclined sinking groove is set with the front higher than the rear.

[0015] Preferably, the front openings of the two inclined sinking grooves on the left side are respectively matched with the left ends of the two transverse groove holes, and the front openings of the two inclined sinking grooves on the right side are respectively matched with the right ends of the two transverse groove holes. The two inclined sinking grooves located behind the same transverse groove hole are arranged in parallel with each other.

[0016] Preferably, the inner walls on the upper and lower sides of each transverse groove hole are arranged with the front end higher than the rear end and are parallel to the two inclined sinking grooves behind it; the upper and lower widths of each transverse groove hole and each inclined sinking groove are respectively matched with the thickness of the rectangular frame.

[0017] Preferably, the rectangular frames in the two filter layers are respectively inserted into the cuboid treatment cylinder obliquely through the two transverse groove holes, and the left and right sides of each rectangular frame are respectively movably embedded in the corresponding two inclined sinking grooves, and the rear edge of the rectangular frame is attached to the rear inner wall of the cuboid treatment cylinder.

[0018] Preferably, a handle located outside the cuboid treatment cylinder is further fixed to the front side of each rectangular frame for easy pulling.

[0019] Preferably, a liquid supplement pipe is hermetically inserted and connected to one side of the lye storage tank, and the end opening of the liquid supplement pipe extends out of the cuboid treatment cylinder in a sealed manner.

[0020] Preferably, a U-shaped pipe higher than the serpentine coiled pipe is hermetically inserted and arranged on the left side of the cuboid treatment cylinder, and the two end openings of the U-shaped pipe are arranged downward and are respectively located inside and outside the cuboid treatment cylinder.

[0021] Preferably, the inner end opening of the U-shaped pipe is hermetically connected to one end of the serpentine coiled pipe.

[0022] Preferably, a conical air guide cover is further provided outside the left side of the cuboid treatment cylinder and is located below the U-shaped pipe. The opening of the conical air guide cover is arranged downward, and the outer end opening of the U-shaped pipe is hermetically inserted into the top of the conical air guide cover and is communicated with the inside of the conical air guide cover.

[0023] Compared with the prior art, the advantages of the present utility model are as follows: the present utility model first liquefies a part of the acidic tail gas directly by means of the cooling effect of the serpentine coiled pipe and the weak lye, and then neutralizes the acidic tail gas by means of the chemical properties of the weak lye. Furthermore, physical and chemical methods are simultaneously used to treat the acidic tail gas, thereby greatly improving the treatment effect; in this way, only by means of the two filter layers to physically adsorb the acidic tail gas can the acidic tail gas be completely removed, thereby effectively reducing the volume of the treatment equipment, thus saving space and reducing the material cost; in addition, the treatment time of the acidic tail gas is also greatly reduced to significantly improve the treatment efficiency. Description of the Drawings

[0024] Figure 1 This is the exploded view of the right front side of the present utility model;

[0025] Figure 2 This is the exploded view of the left rear side of the present utility model. Detailed implementation manners

[0026] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings as understood by those of ordinary skill in the field to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0027] In order to keep the following description of the embodiments of the present utility model clear and concise, the detailed descriptions of known functions and known components are omitted in the present utility model.

[0028] As Figures 1 - 2 shown, a tail gas treatment device for preparing benzotriazole includes a cuboid treatment cylinder 2, a seat plate 1 hermetically fixed at the bottom opening of the cuboid treatment cylinder 2, a cover body 7 hermetically fixed at the top opening of the cuboid treatment cylinder 2, and an exhaust pipe 8 hermetically inserted at the top of the cover body 7;

[0029] On the top right side of the seat plate 1, a liquid collecting hopper 101 is formed downward, and a liquid discharge pipe 9 is also hermetically inserted at the bottom of the liquid collecting hopper 101;

[0030] It further includes an alkali liquid storage tank 3 fixed inside the cuboid treatment cylinder 2 and a serpentine coil pipe 4 horizontally arranged below the interior of the alkali liquid storage tank 3. One end of the serpentine coil pipe 4 hermetically passes upward through the top of the alkali liquid storage tank 3 and extends above the alkali liquid storage tank 3, and the other end of the serpentine coil pipe 4 horizontally hermetically passes through one side of the alkali liquid storage tank 3 and extends above the liquid collecting hopper 101;

[0031] Inside the cuboid treatment cylinder 2, there are also two filter layers which are respectively distributed up and down and are both detachable. The filter layer includes an inclined rectangular frame 10 and a filter plate 11 fixed inside the rectangular frame 10 and parallel to the rectangular frame 10, and the rectangular frame 10 is set with the front higher than the rear;

[0032] It further includes a neutralization component, which includes a liquid inlet pipe 12 vertically fixed outside the right side of the cuboid treatment cylinder 2, a pump body 6 arranged inside the alkali solution storage tank 3, and an atomization unit arranged between two filter layers. The lower end of the liquid inlet pipe 12 is hermetically passed through the right side of the cuboid treatment cylinder 2 and hermetically extends into the interior of the alkali solution storage tank 3 and is connected to the liquid outlet of the pump body 6;

[0033] The atomization unit includes a shunt pipe 13 horizontally fixed inside the seat plate 1 and a plurality of liquid outlet pipes 14 horizontally inserted on the shunt pipe 13 and arranged in sequence from front to back. The upper end of the liquid inlet pipe 12 is hermetically extended into the interior of the cuboid treatment cylinder 2 and is located between two filter layers and is inserted on the shunt pipe 13;

[0034] Both ends of the shunt pipe 13 are closed, and the end openings of each liquid outlet pipe 14 are closed;

[0035] A plurality of atomizing nozzles 16 are sequentially arranged along the length direction of the liquid outlet pipe 14 and are also inserted on the lower side of each liquid outlet pipe 14.

[0036] Two horizontally slotted holes 201 are respectively formed on the front outer wall of the cuboid treatment cylinder 2 and are distributed vertically. Correspondingly, two inclined sinking grooves 202 are respectively formed on the left and right inner walls of the cuboid treatment cylinder 2 and are distributed vertically. Each inclined sinking groove 202 is set with the front end higher than the rear end.

[0037] The front end openings of the two inclined sinking grooves 202 on the left side are respectively matched with the left ends of the two horizontally slotted holes 201, and the front end openings of the two inclined sinking grooves 202 on the right side are respectively matched with the right ends of the two horizontally slotted holes 201. The two inclined sinking grooves 202 located behind the same horizontally slotted hole 201 are arranged in parallel.

[0038] The inner walls on the upper and lower sides of each horizontally slotted hole 201 are set with the front end higher than the rear end and are parallel to the two inclined sinking grooves 202 behind it; the upper and lower widths of each horizontally slotted hole 201 and each inclined sinking groove 202 are respectively matched with the thickness of the rectangular frame 10.

[0039] The rectangular frames 10 in the two filter layers are respectively inserted into the cuboid treatment cylinder 2 obliquely through the two horizontally slotted holes 201, and the left and right sides of each rectangular frame 10 are respectively movably embedded in the corresponding two inclined sinking grooves 202, and the rear edge of the rectangular frame 10 is attached to the rear inner wall of the cuboid treatment cylinder 2.

[0040] A handle 17 located outside the cuboid treatment cylinder 2 is fixedly arranged on the front side of each rectangular frame 10 for easy pulling.

[0041] A liquid supplement pipe 18 is hermetically inserted on one side of the alkali solution storage tank 3, and the end opening of the liquid supplement pipe 18 is hermetically extended outside the cuboid treatment cylinder 2.

[0042] On the left side of the cuboid treatment cylinder 2, a U-shaped pipe 19 is also hermetically inserted and arranged, which is higher than the serpentine coil 4. The two ends of the U-shaped pipe 19 are both arranged downward and are respectively located inside and outside the cuboid treatment cylinder 2.

[0043] The inner end opening of the U-shaped pipe 19 is hermetically connected to one end of the serpentine coil 4.

[0044] On the outside of the left side of the cuboid treatment cylinder 2, a conical air guide cover 5 is also provided below the U-shaped pipe 19. The opening of the conical air guide cover 5 is arranged downward. The outer end opening of the U-shaped pipe 19 is hermetically inserted into the top of the conical air guide cover 5 and is in communication with the inside of the conical air guide cover 5.

[0045] Working principle:

[0046] During the process of preparing benzotriazole, when the cyclization reaction is carried out, acetic acid needs to be added; when the displacement reaction is carried out, sulfuric acid needs to be added to displace acetic acid; during the above two reactions, a certain amount of acidic tail gas will volatilize outward. Therefore, it cannot be directly discharged, but must be treated.

[0047] During treatment, the air outlet of the reaction vessel is connected to the opening of the conical air guide cover 5, so that the acidic tail gas enters the serpentine coil 4 through the conical air guide cover 5 and the U-shaped pipe 19; the weak base solution is introduced into the alkali solution storage tank 3 through the end opening of the liquid supplement pipe 18 and the weak base solution is continuously supplemented to ensure that the liquid level of the weak base solution is always higher than the serpentine coil 4.

[0048] Since the temperature of the weak base solution is relatively low compared to the temperature of the acidic tail gas at room temperature, the temperature of the weak base solution will be transferred to the serpentine coil 4. Most of the acidic tail gas entering the serpentine coil 4 will liquefy after being cooled. The liquefied acidic liquid flows out through the other end of the serpentine coil 4 and just drips downward into the liquid collecting hopper 101, and then is discharged through the drain pipe 9 for collection. Here, the weak base solution in the alkali solution storage tank 3 plays a cooling role.

[0049] The air and the remaining acidic tail gas flow upward from the other end of the serpentine coil 4 and pass through the filter plate 11 in a filter layer below, and then the filter plate 11 adsorbs most of the acidic tail gas, and the unadsorbed acidic tail gas continues to flow upward.

[0050] After starting the operation of the pump body 6, the pump body 6 will transport the weak alkaline solution in the alkaline solution storage tank 3 to the shunt pipe 13 via the liquid inlet pipe 12, and then spray the weak alkaline water mist downward in the form of mist through the atomizing nozzles 16 on each liquid outlet pipe 14, and then react with the acidic tail gas to neutralize most of the residual acidic tail gas. Due to the inclined setting of the filter plate 11, the excess weak alkaline water mist will flow backward along the slope of the filter plate 11 after sedimentation and will not stay on the top of the filter plate 11, so it will not block the filter pores in the filter plate 11, and finally gradually fall to the bottom of the cuboid treatment cylinder 2 and flow into the liquid collecting hopper 101, and then be discharged outward via the drain pipe 9 for collection; here, the weak alkaline solution plays a role in the neutralization reaction.

[0051] After the neutralization reaction, the amount of acidic tail gas is extremely small. If it continues to rise, it will be completely adsorbed by the filter plate 11 in a filter layer above, and only air will enter the cover body 7 and be discharged outward via the exhaust pipe 8.

[0052] After being processed for a period of time, the adsorption amount of the filter plate 11 is relatively low. At this time, the filter plate 11 needs to be taken out and desorbed for recycling; when taking it out, just hold the handle 17 with your hand and then tilt it forward and upward to pull, so that the left and right sides of the rectangular frame 10 can slide outward along the corresponding two inclined sinking grooves 202 until the rear edge of the rectangular frame 10 leaves the horizontal slot hole 201; after the desorption is completed, the filter layer can be reinstalled into the interior of the cuboid treatment cylinder 2 in the same way.

[0053] The utility model first liquefies a part of the acidic tail gas directly by means of the cooling effect of the serpentine coiled pipe 4 and the weak alkaline solution, and then neutralizes the acidic tail gas by means of the chemical properties of the weak alkaline solution. Furthermore, physical and chemical methods are simultaneously used to treat the acidic tail gas, thereby greatly improving the treatment effect; in this way, only by means of two filter layers to physically adsorb the acidic tail gas can the acidic tail gas be completely removed, thereby effectively reducing the volume of the treatment equipment, thus saving space and reducing the material cost; in addition, the treatment time of the acidic tail gas is also greatly reduced to significantly improve the treatment efficiency.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A tail gas treatment device for preparing benzotriazole, characterized in that: It includes a cuboid treatment cylinder, a base plate hermetically fixed at the bottom opening of the cuboid treatment cylinder, a cover body hermetically fixed at the top opening of the cuboid treatment cylinder, and an exhaust pipe hermetically inserted at the top of the cover body; On the top right side of the base plate, a liquid collecting hopper is formed downward, and a drain pipe is hermetically inserted at the bottom of the liquid collecting hopper; It also includes an alkali solution storage tank fixed inside the cuboid treatment cylinder and a serpentine coil pipe horizontally arranged below the interior of the alkali solution storage tank. One end of the serpentine coil pipe hermetically passes through the top of the alkali solution storage tank upward and extends above the alkali solution storage tank, and the other end of the serpentine coil pipe horizontally hermetically passes through one side of the alkali solution storage tank and extends above the liquid collecting hopper; Inside the cuboid treatment cylinder, there are also two filter layers which are respectively distributed vertically and are both detachable. Each filter layer includes an inclined rectangular frame and a filter plate fixed inside the rectangular frame and parallel to the rectangular frame. The rectangular frame is set with the front higher than the rear; It also includes a neutralization component. The neutralization component includes a liquid inlet pipe vertically fixed outside the right side of the cuboid treatment cylinder, a pump body arranged inside the alkali solution storage tank, and an atomization unit arranged between the two filter layers. The lower end of the liquid inlet pipe hermetically passes through the right side of the cuboid treatment cylinder and hermetically extends into the interior of the alkali solution storage tank and is connected to the liquid outlet of the pump body; The atomization unit includes a shunt pipe horizontally fixed inside the base plate and a plurality of liquid outlet pipes horizontally inserted on the shunt pipe and arranged in sequence from front to back. The upper end of the liquid inlet pipe hermetically extends into the interior of the cuboid treatment cylinder and is located between the two filter layers and is inserted on the shunt pipe; Both ends of the shunt pipe are closed, and the end openings of each liquid outlet pipe are closed; On the lower side of each liquid outlet pipe, a plurality of atomizing nozzles are also inserted and arranged in sequence along the length direction of the liquid outlet pipe.

2. A tail gas treatment device for preparing benzotriazole according to claim 1, characterized in that: On the front outer wall of the cuboid treatment cylinder, two horizontal slot holes are respectively formed and distributed vertically. Correspondingly, on the left and right inner walls of the cuboid treatment cylinder, two inclined sunk grooves are respectively formed and distributed vertically. Each inclined sunk groove is set with the front higher than the rear.

3. A tail gas treatment device for preparing benzotriazole according to claim 2, characterized in that, The front end openings of the two inclined sunk grooves on the left side respectively cooperate with the left ends of the two horizontal slot holes, and the front end openings of the two inclined sunk grooves on the right side respectively cooperate with the right ends of the two horizontal slot holes. The two inclined sunk grooves located behind the same horizontal slot hole are both arranged in parallel.

4. An exhaust gas treatment device for preparing benzotriazole according to claim 3, characterized in that, The inner walls on the upper and lower sides of each horizontal slot hole are both set with the front higher than the rear and are both parallel to the two inclined sunk grooves behind it; the upper and lower widths of each horizontal slot hole and each inclined sunk groove both cooperate with the thickness of the rectangular frame.

5. The tail gas treatment device for preparing benzotriazole according to claim 4, characterized in that, The rectangular frames in the two filter layers are respectively inserted into the cuboid treatment cylinder obliquely through the two horizontal slot holes, and the left and right sides of each rectangular frame are respectively movably embedded in the corresponding two inclined sunk grooves, and the rear edge of the rectangular frame fits against the rear inner wall of the cuboid treatment cylinder.

6. The tail gas treatment device for preparing benzotriazole according to claim 1, characterized in that, On the front side of each rectangular frame, a handle located outside the cuboid treatment cylinder is also fixed for easy pulling.

7. The tail gas treatment device for preparing benzotriazole according to claim 1, characterized in that: On one side of the alkali solution storage tank, a liquid supplement pipe is hermetically inserted, and the end opening of the liquid supplement pipe hermetically extends outside the cuboid treatment cylinder.

8. An exhaust gas treatment device for preparing benzotriazole according to claim 1, characterized in that, On the left side of the cuboid processing cylinder, a U-shaped pipe higher than the serpentine coil is also hermetically inserted. The openings at both ends of the U-shaped pipe are arranged downward and are respectively located inside and outside the cuboid processing cylinder.

9. The tail gas treatment device for preparing benzotriazole according to claim 8, characterized in that: The inner end opening of the U-shaped pipe is hermetically connected to one end of the serpentine coil.

10. The tail gas treatment device for preparing benzotriazole according to claim 8, characterized in that: On the outside of the left side of the cuboid processing cylinder, a conical air guide cover located below the U-shaped pipe is also provided. The opening of the conical air guide cover is arranged downward. The outer end opening of the U-shaped pipe is hermetically inserted into the top of the conical air guide cover and is in communication with the inside of the conical air guide cover.

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