Tail gas treatment device in synthesis of 2-ethylanthraquinone

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly provides a tail gas treatment device in 2-ethyl anthraquinone synthesis, which comprises a first water tank, a second water tank and a third water tank which are sequentially communicated through an overflow pipeline, the third water tank is communicated to an absorption water head tank, and the first water tank is communicated to a hydrochloric acid storage tank through an overflow port. The top of the first water tank is communicated to the first falling film absorber, the first falling film absorber is provided with a first air inlet, the first water tank is communicated to the first falling film absorber through the first circulating pump, the top of the first water tank is communicated to the second water tank, and the top of the second water tank is communicated to the second falling film absorber. The second water tank is communicated to a second falling film absorber through a second circulating pump, the top of the second falling film absorber is communicated to a third falling film absorber, the bottom of the third falling film absorber is communicated to a third water tank, the third water tank is communicated to a third falling film absorber through a third circulating pump, and the top of the third water tank is communicated to a tail gas neutralization system. The device can fully absorb hydrogen chloride tail gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical equipment technical field especially relates to a tail gas treatment device in 2-ethylanthraquinone synthesis. BACKGROUND

[0002] 2-ethylanthraquinone is a light yellow flaky crystal, soluble in organic solvents, melting point 107-111 DEG C, mainly used for manufacturing hydrogen peroxide, dye intermediate, photocuring resin catalyst, photodegradation film, coating and photosensitive polymerization initiator.

[0003] The main synthesis method of 2-ethylanthraquinone in industry is benzene anhydride method, also called Friedel-Crafts method, which is mainly divided into two steps, first, 2- (4-ethylbenzoyl) benzoic acid (BE acid) is synthesized by taking ethylbenzene and phthalic anhydride as raw materials under the action of AlCl3, then BE acid is dehydrated and ring-closed to generate 2-ethylanthraquinone under the action of fuming sulfuric acid.

[0004] In the process of synthesizing 2-ethylanthraquinone, some by-products will be produced, among which, hydrogen chloride gas containing tail gas will be produced in the process of acylation and hydrolysis, and hydrogen chloride gas has strong corrosiveness, which has great harm to human body and environment. At the same time, hydrogen chloride gas is not utilized, which is also a waste of resources. UTILITY MODEL CONTENT

[0005] In view of the above defects, the utility model provides a tail gas treatment device in 2-ethylanthraquinone synthesis, which can fully utilize the hydrogen chloride gas tail gas generated in the process of acylation and hydrolysis of 2-ethylanthraquinone production, and realize non-pollution discharge.

[0006] To achieve the above object, the utility model provides the following technical scheme: A tail gas treatment device in 2 - ethyl anthraquinone synthesis, including first water tank, second water tank, third water tank, first water tank, second water tank, third water tank are sequentially communicated by the overflow pipeline of setting, third water tank is communicated to the absorption water high -level tank, first water tank is communicated to the hydrochloric acid storage jar through the overflow port, first water tank top is provided with the first water tank liquid inlet that is communicated to first falling film absorber, first falling film absorber top is provided with first gas inlet, the water outlet of first water tank is communicated to first falling film absorber through first circulating pump, first water tank top is provided with the first water tank gas outlet that is communicated to second water tank, second water tank top is provided with the second water tank gas outlet that is communicated to second falling film absorber, the water outlet of second water tank is communicated to second falling film absorber through second circulating pump, second falling film absorber top is provided with the first gas outlet that is communicated to third falling film absorber, third falling film absorber bottom is provided with the second liquid outlet that is communicated to third water tank, the water outlet of third water tank is communicated to third falling film absorber through third circulating pump, third water tank top is provided with the third water tank gas outlet that is communicated to tail gas neutralization system.

[0007] As a further improvement of the utility model, the tail gas neutralization system includes a first neutralization tower and a second neutralization tower that are in communication with each other, the second neutralization tower is connected to a lye supply, the liquid outlet at the bottom of the second neutralization tower is connected to the liquid inlet end of a second neutralization pump, the liquid outlet end of the second neutralization pump is provided with a second four-way joint, the first end and the second end of the second four-way joint are respectively connected to the liquid spraying heads at the middle and the upper part of the second neutralization tower, the third end of the second four-way joint is connected to the first neutralization tower, the top of the second neutralization tower is provided with an air outlet connected to an induced draft fan, and the air outlet of the induced draft fan is connected to an active fiber treatment system.

[0008] As a further improvement of the utility model, the bottom of the first neutralization tower is provided with a liquid outlet connected to the liquid inlet end of a first neutralization pump, the liquid outlet end of the first neutralization pump is provided with a first four-way joint, the second end and the first end of the first four-way joint are respectively connected to the liquid spraying heads at the middle and the upper part of the first neutralization tower, and the third end of the first four-way joint is connected to a decontamination treatment station.

[0009] As a further improvement of the utility model, the bottom of the first water tank is provided with a first gas phase balance pipe, and the first gas phase balance pipe is connected to the liquid inlet of the first water tank and the pipeline connected to the first falling film absorber.

[0010] As a further improvement of the utility model, the bottom of the second water tank is provided with a second gas phase balance pipe, and the second gas phase balance pipe is connected to the liquid inlet of the first water tank and the pipeline connected to the first falling film absorber.

[0011] As a further improvement of the utility model, the third water tank bottom is provided with a third gas phase balance pipe, the third gas phase balance pipe is communicated to the first water tank liquid inlet and the pipeline connected with the first falling film absorber.

[0012] The utility model discloses beneficial effect has:

[0013] Through setting three groups of falling film absorption devices, the tail gas containing hydrogen chloride gas from acylation hydrolysis can be fully absorbed, so that hydrogen chloride gas in the tail gas can completely dissolve into water, thereby obtaining hydrochloric acid solution. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the tail gas treatment device schematic diagram in 2-ethylanthraquinone synthesis of the utility model,

[0015] Figure 2 It is tail gas neutralization system schematic diagram.

[0016] In the drawing: 1-hydrochloric acid delivery pump, 2-hydrochloric acid storage tank, 3-first water tank, 4-first falling film absorber, 5-first gas phase balance pipe, 6-first circulating pump, 7-second water tank, 8-second gas phase balance pipe, 9-second falling film absorber, 10-second circulating pump, 11-third falling film absorber, 12-third water tank, 13-third gas phase balance pipe, 14-third circulating pump, 15-absorption water high tank, 16-first neutralization pump, 17-first neutralization tower, 18-second neutralization tower, 19-second neutralization pump, 20-inducing fan. DETAILED DESCRIPTION

[0017] In order to make the utility model purposes, technical scheme and advantages more clearly, following with the drawing, to the utility model further detailed description should be understood, the specific example described here is merely used to explain the utility model, and is not used to limit the utility model.

[0018] As Figure 1 , Figure 2 The utility model discloses a kind of tail gas treatment devices in 2-ethylanthraquinone synthesis, including several tail gas absorption water tanks, the number of tail gas absorption water tank is 3, including first water tank 3, second water tank 7, third water tank 12.

[0019] The third water tank 12 is provided with an absorption water inlet on one side, which is connected to the absorption water head tank 15 through a pipeline. The absorption water head tank 15 is provided with a water inlet at the top.

[0020] As a further illustration of the present example, the water in the absorption water head tank 15 comes from the water produced in the chlorobenzene separation process in the production of 2-ethylanthraquinone. The water in the absorption water head tank 15 can enter the third water tank 12.

[0021] The third water tank 12 is provided with a third overflow outlet on the upper side of one side, which is connected to the second overflow inlet on the lower side of the second water tank 7 through a pipeline. The second water tank 7 is provided with a second overflow outlet on the upper side of one side, which is connected to the first overflow inlet on the lower side of the first water tank 3 through a pipeline. The first water tank 3 is provided with a first overflow outlet on the upper side of one side, which is connected to the hydrochloric acid storage tank 2 through a pipeline. The hydrochloric acid storage tank 2 is provided with a hydrochloric acid outlet on the side of the bottom, and the hydrochloric acid outlet is provided with a hydrochloric acid delivery pump 1.

[0022] The first water tank 3 is provided with a first water tank liquid inlet on the side of the top, which is connected to the first liquid outlet provided at the bottom of the first falling film absorber 4 through a pipeline. The first falling film absorber 4 is provided with a first gas inlet at the top, through which hydrogen chloride gas can be introduced into the first falling film absorber 4. The first falling film absorber 4 is provided with a first water return port on the side of the upper part, which is connected to the liquid outlet end of the first circulating pump 6 through a pipeline. The liquid inlet end of the first circulating pump 6 is connected to the first water tank 3 through a pipeline, which is connected to the first water tank liquid outlet provided on the side of the lower part of the first water tank 3. The first water tank 3 is provided with a first gas phase balance pipe 5, which is connected to the pipeline connected to the first water tank liquid inlet and the first falling film absorber 4.

[0023] As a further illustration of the present example, hydrogen chloride gas is introduced into the first falling film absorber 4 from the first gas inlet, and at the same time, the first circulating pump 6 continuously introduces the liquid in the first water tank 3 into the top of the first falling film absorber 4. The liquid falls together with the hydrogen chloride gas, continuously absorbing hydrogen chloride to produce hydrochloric acid solution, until a hydrochloric acid solution with a concentration of 5% is generated.

[0024] The other side of the top of the first water tank 3 is provided with a first water tank gas outlet, which is communicated to a second water tank gas inlet provided on one side of the top of the second water tank 7. The other side of the top of the second water tank 7 is provided with a second water tank gas outlet, which is communicated to a second gas inlet provided on the bottom of the second falling film absorber 9. One side of the upper part of the second falling film absorber 9 is provided with a second water return port, which is communicated to the liquid outlet end of the second circulating pump 10 through a pipeline. The liquid inlet end of the second circulating pump 10 is communicated to a second water tank liquid outlet provided on one side of the lower part of the second water tank 7. The bottom of the second water tank 7 is provided with a second gas phase balance pipe 8, which is communicated to the first water tank liquid inlet and the pipeline connected to the first falling film absorber 4.

[0025] As a further description of the present example, the hydrogen chloride gas absorbed by the first falling film absorber 4 cannot be completely absorbed. The hydrogen chloride gas is discharged from the first water tank gas outlet of the first water tank 3, enters the second water tank 7, and then enters the second falling film absorber 9 from the second water tank 7. At the same time, the second circulating pump 10 passes the liquid in the second water tank 7 to the top of the second falling film absorber 9. The liquid forms a convection with the hydrogen chloride gas from the second water tank 7, continuously absorbs the hydrogen chloride gas to generate hydrochloric acid solution, generates hydrochloric acid solution with a concentration of 3%, and the hydrochloric acid solution falls into the second water tank 7 from the second water tank gas outlet.

[0026] The top of the second falling film absorber 9 is provided with a first gas outlet, which is communicated to a third gas inlet provided on the top of the third falling film absorber 11 through a pipeline. The bottom of the third falling film absorber 11 is provided with a second liquid outlet, which is communicated to a third water tank liquid inlet provided on one side of the top of the third water tank 12 through a pipeline. One side of the lower part of the third water tank 12 is provided with a third water tank liquid outlet, which is communicated to the liquid inlet end of the third circulating pump 14 through a pipeline. The liquid outlet end of the third circulating pump 14 is communicated to a third water return port provided on one side of the upper part of the third falling film absorber 11 through a pipeline. The bottom of the third water tank 12 is provided with a third gas phase balance pipe 13, which is communicated to the first water tank liquid inlet and the pipeline connected to the first falling film absorber 4.

[0027] As a further description of the present example, the hydrogen chloride gas absorbed by the second falling film absorber 9 is discharged from the first gas outlet of the second falling film absorber 9, enters the third falling film absorber 11, and at the same time, the third circulating pump 14 continuously passes the liquid in the third water tank 12 to the top of the third falling film absorber 11. The liquid falls together with the hydrogen chloride gas while continuously absorbing the hydrogen chloride to produce hydrochloric acid solution, until hydrochloric acid solution with a concentration of 1% is generated.

[0028] The third water tank 12 is provided with a third water tank gas outlet on the other side of the top, and the third water tank gas outlet is communicated to the tail gas neutralization system.

[0029] The first neutralization tower 17 is provided with a gas outlet on one side of the middle part and communicated to the second neutralization tower 18; the second neutralization tower 18 is provided with a liquid outlet on the bottom and communicated to the liquid inlet end of the second neutralization pump 19, and the liquid outlet end of the second neutralization pump 19 is provided with a second four-way joint; the first end of the second four-way joint is communicated to the liquid inlet on the middle part of the first neutralization tower 17 through a pipeline; the second end of the second four-way joint is communicated to the liquid injection head on the upper part of the second neutralization tower 18 through a pipeline; and the third end of the second four-way joint is communicated to the liquid injection head on the middle part of the second neutralization tower 18 through a pipeline.

[0030] As a further description of the present example, the second neutralization tower 18 is communicated to the alkali liquid supply, and the NaOH solution with a concentration of 10%-20% enters into the second neutralization tower 18; the NaOH solution is circulated in the second neutralization tower 18 through the second neutralization pump 19, and at the same time, the NaOH solution is injected into the first neutralization tower 17 and circulated in the first neutralization tower 17 through the first neutralization pump 16; when the tail gas absorbed by the three-stage falling film absorption device enters into the first neutralization tower 17 and the second neutralization tower 18, the hydrogen chloride gas therein reacts with the NaOH solution and is completely absorbed; after the NaOH solution is completely reacted, the solution in the second neutralization tower 18 first enters into the first neutralization tower 17, and then is transported to the treatment station for decontamination treatment through the first neutralization absorption pump.

[0031] The second neutralization tower 18 is provided with an air outlet on the top, and the air outlet is communicated to the air inlet of the induced draft fan 20 through a pipeline; the air outlet of the induced draft fan 20 is communicated to the activated carbon fiber treatment system, and after further treatment, the air is discharged.

[0032] The working principle and use process of the utility model are as follows:

[0033] The water absorption high tank 15 absorbs the water generated by separating chlorobenzene, and injects into the third water tank 12. The third water tank 12, the second water tank 7 and the first water tank 3 are communicated in sequence through overflow ports, and the water solution is stored in the three tail gas absorption water tanks through overflow. The water solution is circulated in the tail gas absorption water tank and the falling film absorber through the circulating pump connected with the tail gas absorption water tank.

[0034] The tail gas containing hydrogen chloride gas generated in the acylation hydrolysis process is introduced into the device, and is fully absorbed in the first falling film absorber 4, the second falling film absorber 9 and the third falling film absorber 11 in sequence. The third water tank 12, the second water tank 7 and the first water tank 3 respectively generate hydrochloric acid solutions with concentrations of 1%, 3% and 5%. The hydrochloric acid solution with a lower concentration is introduced into the tail gas absorption water tank with a higher concentration through overflow for further absorption. Finally, the hydrochloric acid solution with a concentration of 5% is overflowed from the first water tank 3 and introduced into a hydrochloric acid storage tank, which can be directly used as a by-product.

[0035] Meanwhile, the content of hydrogen chloride gas in the tail gas is greatly reduced. The tail gas enters the tail gas neutralization system from the third falling film absorber 11, is fully absorbed by the lye in the first neutralization tower 17 and the second neutralization tower 18, so that the hydrogen chloride gas in the tail gas is completely eliminated, and finally enters the activated carbon fiber treatment system for treatment and is finally discharged.

[0036] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned implementation measures. Any technical solution falling within the idea of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.

Claims

1. A tail gas treatment device for the synthesis of 2-ethylanthraquinone, characterized in that, The system includes a first water tank (3), a second water tank (7), and a third water tank (12). The first water tank (3), the second water tank (7), and the third water tank (12) are connected in sequence through an overflow pipe. The third water tank (12) is connected to the high-level absorption water tank (15). The first water tank (3) is connected to the hydrochloric acid storage tank (2) through an overflow port. The top of the first water tank (3) is provided with a first water tank inlet that connects to the first falling film absorber (4). The top of the first falling film absorber (4) is provided with a first air inlet. The outlet of the first water tank (3) is connected to the first falling film absorber (4) through a first circulating pump (6). The top of the first water tank (3) is provided with a connection to the second water tank. (7) has a first water tank outlet, and the top of the second water tank (7) is provided with a second water tank outlet connected to the second falling film absorber (9). The outlet of the second water tank (7) is connected to the second falling film absorber (9) through the second circulation pump (10). The top of the second falling film absorber (9) is provided with a first air outlet connected to the third falling film absorber (11). The bottom of the third falling film absorber (11) is provided with a second liquid outlet connected to the third water tank (12). The outlet of the third water tank (12) is connected to the third falling film absorber (11) through the third circulation pump (14). The top of the third water tank (12) is provided with a third water tank outlet connected to the exhaust gas neutralization system.

2. The tail gas treatment device for the synthesis of 2-ethylanthraquinone according to claim 1, characterized in that, The tail gas neutralization system includes a first neutralization tower (17) and a second neutralization tower (18) that are interconnected. The second neutralization tower (18) is connected to the alkali supply point. The outlet at the bottom of the second neutralization tower (18) is connected to the inlet of the second neutralization pump (19). The outlet of the second neutralization pump (19) is provided with a second four-way connector. The first and second ends of the second four-way connector are respectively connected to the spray head in the middle and upper part of the second neutralization tower (18). The third end of the second four-way connector is connected to the first neutralization tower (17). The top of the second neutralization tower (18) is provided with an outlet connected to the induced draft fan (20). The outlet of the induced draft fan (20) is connected to the active fiber treatment system.

3. The tail gas treatment device for the synthesis of 2-ethylanthraquinone according to claim 2, characterized in that, The bottom of the first neutralization tower (17) is provided with an outlet that connects to the inlet of the first neutralization pump (16). The outlet of the first neutralization pump (16) is provided with a first four-way connector. The second end and the first end of the first four-way connector are respectively connected to the spray head in the middle and upper part of the first neutralization tower (17). The third end of the first four-way connector is connected to the decontamination treatment station.

4. The tail gas treatment device for the synthesis of 2-ethylanthraquinone according to claim 1, characterized in that, The bottom of the first water tank (3) is provided with a first gas phase balance pipe (5), which is connected to the pipeline connected to the liquid inlet of the first water tank and the first falling film absorber (4).

5. The tail gas treatment device for the synthesis of 2-ethylanthraquinone according to claim 1, characterized in that, The bottom of the second water tank (7) is provided with a second gas phase balance pipe (8), which is connected to the pipeline connected to the liquid inlet of the first water tank and the first falling film absorber (4).

6. The tail gas treatment device for the synthesis of 2-ethylanthraquinone according to claim 1, characterized in that, The bottom of the third water tank (12) is provided with a third gas phase balance pipe (13), which is connected to the pipeline connected to the liquid inlet of the first water tank and the first falling film absorber (4).

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