CN217855460U - Chlorination tail gas processing apparatus - Google Patents
Chlorination tail gas processing apparatus Download PDFInfo
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- CN217855460U CN217855460U CN202222027662.0U CN202222027662U CN217855460U CN 217855460 U CN217855460 U CN 217855460U CN 202222027662 U CN202222027662 U CN 202222027662U CN 217855460 U CN217855460 U CN 217855460U
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Abstract
The utility model belongs to the technical field of the chemical industry equipment technique and specifically relates to a chlorination tail gas processing apparatus, including one-level purification mechanism and second grade purification mechanism, one-level purification mechanism includes one-level washing purification tower, the one-level circulation groove, one-level circulating pump and one-level cooler, second grade purification mechanism includes second grade washing purification tower, the second grade circulation groove, second grade circulating pump and second grade cooler, the discharge gate of second grade washing purification tower bottom passes through the feed end of pipe connection second grade circulation groove, the material pumping pipe of second grade circulating pump is connected to the discharge end of second grade circulation groove, the feed end interface of second grade cooler is connected to the feed pipe of second grade circulating pump, the discharge end of second grade cooler passes through the material receiving mouth on pipe connection second grade washing purification tower top right side, be provided with the back flow of connecting the one-level circulation groove on the feed pipe of second grade circulating pump. The utility model discloses, simple structure, the material is ordinary, convenient operation, the working costs is low, and absorption effect is good, suitable using widely.
Description
Technical Field
The utility model relates to a chemical industry equipment technical field specifically is a chlorination tail gas processing apparatus.
Background
The side chain chlorination and the ring chlorination of toluenes have multiple reaction types, large production capacity and wide application. Under certain reaction conditions, when the raw materials react with chlorine, hydrogen chloride gas is released, and organic matters such as the raw materials escape along with the hydrogen chloride gas to form reaction tail gas.
The reaction tail gas is usually recovered by a multistage condensation recovery device, such as the chlorination of a toluene side chain to produce trichlorotoluene, the tail gas is carried with organic matters such as raw material toluene, main intermediate products such as monochlorotoluene, dichlorotoluene and product trichlorotoluene besides a large amount of hydrogen chloride, in order to recover the organic matters in the reaction tail gas, water cooling recovery is firstly carried out, and then freezing and deep cooling recovery are carried out, because the hydrogen chloride is non-condensable gas, although the gas is recovered by multistage condensation, the gas still contains about 7.5kg/h of organic matters, the tail gas enters a hydrochloric acid absorption system, the obtained hydrochloric acid contains the organic matters, the organic matters in the hydrochloric acid can be hydrolyzed or polymerized, and the like, such as the hydrolysis of the monochlorotoluene to produce benzyl alcohol and the polymerization to generate biphenyl compounds, so that the organic matters in the hydrochloric acid are difficult to utilize after being recovered. Hydrochloric acid with high organic content cannot be directly sold as a byproduct, and secondary pollution can be caused. Purification treatment is required, and the common methods are as follows:
a combination of methods such as settling separation, filtration, coalescence separation, resin adsorption, distillation, and the like;
because hydrochloric acid has strong irritation, acidity and corrosivity, the purification equipment is required to be high in corrosion resistance and strong in tightness, and the good operation environment is ensured. The purification is generally carried out by using hydrochloric acid after pretreatment and then adsorbing by resin. However, there are many waste organic substances in the pretreatment, and when the resin is adsorbed, desorbed and regenerated, waste water and waste gas are generated, and the organic substances pollute the resin and reduce the service life of the resin. Therefore, the purification equipment has large investment, high operation and maintenance cost and more three wastes, and the chlorination reaction tail gas treatment device is provided aiming at the problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a chlorination tail gas processing apparatus, simple structure, the material is ordinary, convenient operation, the working costs is low, absorbs effectually to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a chlorination reaction tail gas treatment device comprises:
the first-stage purification mechanism comprises a first-stage washing purification tower, a first-stage circulation tank, a first-stage circulating pump and a first-stage cooler, wherein a discharge port at the bottom of the first-stage washing purification tower is connected with a feed end of the first-stage circulation tank through a pipeline, a discharge end of the first-stage circulation tank is connected with a material pumping pipe of the first-stage circulating pump, a feed pipe of the first-stage circulating pump is connected with a feed end interface of the first-stage cooler, and a discharge end of the first-stage cooler is connected with a material receiving port on the right side of the top of the first-stage washing purification tower through a pipeline;
the second-stage purification mechanism comprises a second-stage washing purification tower, a second-stage circulating tank, a second-stage circulating pump and a second-stage cooler, a discharge port at the bottom of the second-stage washing purification tower is connected with a feed end of the second-stage circulating tank through a pipeline, a discharge end of the second-stage circulating pump is connected with a material pumping pipe of the second-stage circulating pump, a feed pipe of the second-stage circulating pump is connected with a feed end interface of the second-stage cooler, and a discharge end of the second-stage cooler is connected with a material receiving port at the right side of the top of the second-stage washing purification tower through a pipeline;
a return pipe connected with the primary circulation tank is arranged on a feeding pipe of the secondary circulation pump, and an air outlet at the top of the primary washing and purifying tower is connected with a feed inlet at the left side of the lower half area of the secondary washing and purifying tower through an air guide pipe.
As a preferable scheme, a tail gas inlet is arranged at the left side of the lower half area of the primary washing and purifying tower.
As a preferred scheme, all be provided with the defroster on first-order washing purification tower and the second grade washing purification tower upper segment inner wall, and the material receiving mouth of first-order washing purification tower and second grade washing purification tower all sets up in the defroster below.
As a preferred scheme, a tee joint is arranged on a feeding pipe of the primary circulating pump, and a recovery pipe is arranged on the tee joint.
As a preferable scheme, the secondary circulation tank is provided with an adding pipe, and the adding pipe is connected with a fresh oxidation material supply pipeline.
As a preferred scheme, the primary cooler and the secondary cooler are tube type water-cooling coolers, cooling liquid inlets of the primary cooler and the secondary cooler are arranged on the left side of the bottom, and cooling liquid outlets of the primary cooler and the secondary cooler are arranged on the right side of the top.
As a preferable scheme, the demister specifically comprises an inclined plate and a mounting rack for fixing the inclined plate, wherein a liquid distributor is arranged above the inclined plate, and a gas-liquid separator is arranged below the inclined plate.
As a preferred scheme, the top of the secondary washing and purifying tower is provided with a tail gas outlet.
By the foregoing the utility model provides a technical scheme can find out, the utility model provides a pair of chlorination tail gas processing apparatus, beneficial effect is: through using one-level purification mechanism and second grade purification mechanism as chlorination tail gas treatment's equipment, wherein, one-level purification mechanism includes one-level washing purification tower, the one-level circulation tank, one-level circulating pump and one-level cooler, second grade purification mechanism includes second grade washing purification tower, the second grade circulation tank, second grade circulating pump and second grade cooler, be provided with the back flow of connecting the one-level circulation tank on the feed pipe of second grade circulating pump, the left feed inlet in second grade washing purification tower lower half district is passed through the gas duct in the gas outlet at one-level washing purification tower top, can once only make the low qualified hydrochloric acid of organic matter content, solve and have the high problem of hydrochloric acid organic matter content among the prior art, moreover, the steam generator is simple in structure, the material is ordinary, and convenient for operation, the working costs is low, and the absorption effect is good.
Drawings
FIG. 1 is the overall structure schematic diagram of a chlorination tail gas treatment device of the present invention.
In the figure: 1. a first-stage washing and purifying tower; 11. a first-stage circulation tank; 12. a first-stage circulating pump; 13. a primary cooler; 2. a gas-guide tube; 3. a second-stage washing purification tower; 31. a secondary circulation tank; 32. a second-stage circulating pump; 33. a secondary cooler; 4. a recovery pipe; 5. an addition pipe; 6. a return pipe; 7. a tail gas outlet; 8. A demister.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the present invention.
As shown in fig. 1, the embodiment of the utility model provides a chlorination tail gas processing apparatus, include:
the first-stage purification mechanism comprises a first-stage washing and purification tower 1, a first-stage circulation tank 11, a first-stage circulation pump 12 and a first-stage cooler 13, a tail gas inlet is formed in the left side of the lower half area of the first-stage washing and purification tower 1, a discharge port at the bottom of the first-stage washing and purification tower 1 is connected with the feed end of the first-stage circulation tank 11 through a pipeline, a discharge end of the first-stage circulation tank 11 is connected with a pumping pipe of the first-stage circulation pump 12, a feed pipe of the first-stage circulation pump 12 is connected with a feed end port of the first-stage cooler 13, and a discharge end of the first-stage cooler 13 is connected with a material receiving port on the right side of the top of the first-stage washing and purification tower 1 through a pipeline;
the second-stage purification mechanism comprises a second-stage washing and purification tower 3, a second-stage circulation tank 31, a second-stage circulation pump 32 and a second-stage cooler 33, a tail gas outlet 7 is formed in the top of the second-stage washing and purification tower 3, a discharge port in the bottom of the second-stage washing and purification tower 3 is connected with a feed end of the second-stage circulation tank 31 through a pipeline, a discharge end of the second-stage circulation tank 31 is connected with a pumping pipe of the second-stage circulation pump 32, a feed pipe of the second-stage circulation pump 32 is connected with a feed end port of the second-stage cooler 33, and a discharge end of the second-stage cooler 33 is connected with a material receiving port on the right side of the top of the second-stage washing and purification tower 3 through a pipeline;
please refer to fig. 1, a return pipe 6 connected with the first-stage circulation tank 11 is arranged on a feed pipe of the second-stage circulation pump 32, a gas outlet at the top of the first-stage washing and purifying tower 1 is connected with a left feed inlet at the lower half zone of the second-stage washing and purifying tower 3 through a gas guide pipe 2, demisters 8 are arranged on inner walls of the upper half zones of the first-stage washing and purifying tower 1 and the second-stage washing and purifying tower 3, material receiving ports of the first-stage washing and purifying tower 1 and the second-stage washing and purifying tower 3 are arranged below the demisters 8, the demisters 8 specifically comprise inclined plates and mounting racks for fixing the inclined plates, liquid distributors are arranged above the inclined plates, and a gas-liquid separator is arranged below the inclined plates.
In the device, a tee joint is arranged on a feeding pipe of the primary circulating pump 12, and a recovery pipe 4 is arranged on the tee joint.
In the above apparatus, the second-stage circulation tank 31 is provided with an addition pipe 5, and the addition pipe 5 is connected to a fresh oxidizing material supply line.
In the above device, the primary cooler 13 and the secondary cooler 33 are both tube type water-cooled coolers, and the cooling liquid inlets of the primary cooler 13 and the secondary cooler 33 are both arranged on the left side of the bottom, and the cooling liquid outlets of the primary cooler 13 and the secondary cooler 33 are both arranged on the right side of the top.
In order to ensure the absorption effect, sampling ports are respectively arranged on the first-stage circulating tank 11 and the second-stage circulating tank 31, the content of the raw material toluene, the main intermediate products monochlorotoluene and dichlorotoluene in circulating liquid is periodically detected, and an organic matter concentration detection device can be arranged at the tail gas outlet 7 of the second-stage washing and purifying tower 3 under the condition of permission.
Further, pipelines connected among the first-stage washing and purifying tower 1, the first-stage circulating tank 11, the first-stage circulating pump 12, the first-stage cooler 13, the second-stage washing and purifying tower 3, the second-stage circulating tank 31, the second-stage circulating pump 32 and the second-stage cooler 33 are all made of steel lining tetrafluoride pipes or glass lining pipes.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a chlorination tail gas processing apparatus which characterized in that: the method comprises the following steps:
the device comprises a first-stage purification mechanism, a second-stage purification mechanism and a third-stage purification mechanism, wherein the first-stage purification mechanism comprises a first-stage washing purification tower (1), a first-stage circulating tank (11), a first-stage circulating pump (12) and a first-stage cooler (13), a discharge port at the bottom of the first-stage washing purification tower (1) is connected with a feed end of the first-stage circulating tank (11) through a pipeline, a discharge end of the first-stage circulating tank (11) is connected with a material pumping pipe of the first-stage circulating pump (12), a feed pipe of the first-stage circulating pump (12) is connected with a feed end interface of the first-stage cooler (13), and a discharge end of the first-stage cooler (13) is connected with a material receiving port at the right side of the top of the first-stage washing purification tower (1) through a pipeline;
the secondary purification mechanism comprises a secondary washing purification tower (3), a secondary circulating tank (31), a secondary circulating pump (32) and a secondary cooler (33), a discharge hole in the bottom of the secondary washing purification tower (3) is connected with a feed end of the secondary circulating tank (31) through a pipeline, a discharge end of the secondary circulating tank (31) is connected with a material pumping pipe of the secondary circulating pump (32), a feed pipe of the secondary circulating pump (32) is connected with a feed end interface of the secondary cooler (33), and a discharge end of the secondary cooler (33) is connected with a material receiving hole in the right side of the top of the secondary washing purification tower (3) through a pipeline;
a return pipe (6) connected with the primary circulation tank (11) is arranged on a feeding pipe of the secondary circulation pump (32), and an air outlet at the top of the primary washing and purifying tower (1) is connected with a feed inlet at the left side of the lower half area of the secondary washing and purifying tower (3) through an air guide pipe (2).
2. The chlorination reaction tail gas treatment device according to claim 1, wherein: and a tail gas inlet is formed in the left side of the lower half area of the primary washing and purifying tower (1).
3. The chlorination reaction tail gas treatment device according to claim 1, wherein: the inner walls of the upper half areas of the first-stage washing and purifying tower (1) and the second-stage washing and purifying tower (3) are provided with demisters (8), and the material receiving openings of the first-stage washing and purifying tower (1) and the second-stage washing and purifying tower (3) are arranged below the demisters (8).
4. The chlorination reaction tail gas treatment device according to claim 1, wherein: the feed pipe of the primary circulating pump (12) is provided with a tee joint, and the tee joint is provided with a recovery pipe (4).
5. The chlorination reaction tail gas treatment device according to claim 1, wherein: an adding pipe (5) is arranged on the secondary circulating tank (31), and the adding pipe (5) is connected with a fresh oxidation material supply pipeline.
6. The chlorination reaction tail gas treatment device according to claim 1, wherein: first-order cooler (13) and second grade cooler (33) are shell and tube water-cooling cooler, and the coolant liquid entry of first-order cooler (13) and second grade cooler (33) all sets up on the left side of the bottom to the coolant liquid export of first-order cooler (13) and second grade cooler (33) all sets up on the top right side.
7. The chlorination reaction tail gas treatment device according to claim 3, wherein: the demister (8) specifically comprises an inclined plate and a mounting frame for fixing the inclined plate, a liquid distributor is arranged above the inclined plate, and a gas-liquid separator is arranged below the inclined plate.
8. The chlorination reaction tail gas treatment device according to claim 1, wherein: and a tail gas outlet (7) is formed in the top of the secondary washing and purifying tower (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222027662.0U CN217855460U (en) | 2022-08-03 | 2022-08-03 | Chlorination tail gas processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222027662.0U CN217855460U (en) | 2022-08-03 | 2022-08-03 | Chlorination tail gas processing apparatus |
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| Publication Number | Publication Date |
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| CN217855460U true CN217855460U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222027662.0U Active CN217855460U (en) | 2022-08-03 | 2022-08-03 | Chlorination tail gas processing apparatus |
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| CN (1) | CN217855460U (en) |
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