System capable of recovering methylbenzene in methylbenzene tail gas

Abstract

The utility model relates to the technical field of toluene tail gas recycling systems, in particular to a system capable of recycling toluene in toluene tail gas, which comprises an adsorption tower, the adsorption tower is connected with a filter through a pipeline, the filter is connected with a buffer layering tank through a pipeline, and the upper part of the buffer layering tank is connected with a toluene storage tank through a pipeline; the top of the toluene storage tank is provided with a breather valve and is connected with the bottom of the adsorption tower through a communicating pipe; a single exhalation valve is arranged in the end, close to the methylbenzene storage tank, of the communicating pipe, and the opening pressure of the single exhalation valve is smaller than that of the breather valve; through the arrangement of the communicating pipe, discharged methylbenzene can be introduced into the adsorption tower after the pressure in the methylbenzene storage tank is increased to a certain degree, and is adsorbed and recycled in the adsorption tower, so that environmental pollution and resource waste are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to toluene tail gas recycling system technical field, specifically a system that toluene in toluene tail gas can be recycled. BACKGROUND

[0002] ‌The main components of toluene tail gas include benzene, toluene and xylene, and the toluene in toluene tail gas is generally separated and recycled using adsorption method; the separated toluene is stored in a toluene storage tank, a breather valve is installed at the top of the toluene storage tank; when the pressure in the toluene storage tank increases to a certain degree, toluene will be discharged from the breather valve to the outside; not only pollutes the environment but also causes waste of resources. SUMMARY

[0003] The utility model mainly aims at providing a system that toluene in toluene tail gas can be recycled, to solve the problem that in the prior art, when the pressure in the toluene storage tank increases to a certain degree, toluene will be discharged from the breather valve to the outside, polluting the environment and causing waste of resources.

[0004] In order to realize the above-mentioned purpose, the utility model provides a system that toluene in toluene tail gas can be recycled, including adsorption tower, the adsorption tower is connected with filter through pipeline, the filter is connected with buffer layering jar through pipeline, the upper portion of buffer layering jar is connected with toluene storage tank through pipeline;The top of toluene storage tank is equipped with breather valve, and the top of toluene storage tank is connected with the bottom of adsorption tower through communicating pipe;The single call valve is arranged in the one end of communicating pipe close to toluene storage tank, and the opening pressure of single call valve is less than the opening pressure of breather valve.

[0005] Further, a first vacuum pump and a flame arrestor are arranged on the communicating pipe.

[0006] Further, the top of toluene storage tank is connected with the top of adsorption tower through toluene-into-adsorption-tower pipeline, and a pump is arranged on the toluene-into-adsorption-tower pipeline.

[0007] Further, the top of adsorption tower is connected with the communicating pipe through a circulation pipe.

[0008] Further, a second vacuum pump is arranged on the circulation pipe.

[0009] Further, the adsorption tower is connected with toluene tail gas feeding pipe and desalted water feeding pipe.

[0010] The utility model can introduce the toluene discharged from toluene storage tank into adsorption tower when the pressure in toluene storage tank increases to a certain degree, and the toluene is recycled in adsorption tower, so as to avoid pollution of the environment and waste of resources, and the first vacuum pump is arranged to increase the power for toluene transportation. BRIEF DESCRIPTION OF DRAWINGS

[0011] The drawings accompanying the specification illustrate preferred embodiments of the application and, together with the description, serve to explain the principles of the application.

[0012] Figure 1 Structure schematic view of system capable of recycling toluene in toluene tail gas in embodiments;

[0013] In the figure: 1, adsorption tower; 2, filter; 3, buffer stratified tank; 4, toluene storage tank; 5, breather valve; 6, single call valve; 7, connecting pipe; 8, first vacuum pump; 9, flame arrestor; 10, toluene into adsorption tower pipeline; 11, circulating pipe; 12, toluene tail gas feed pipe; 13, desalted water feed pipe. DETAILED DESCRIPTION

[0014] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0015] As Figure 1 shown, according to the embodiments of the present application, a system capable of recycling toluene in toluene tail gas is provided, which comprises two adsorption towers 1, the adsorption tower 1 is connected with a filter 2 through a pipeline, the filter 2 is connected with a buffer stratified tank 3 through a pipeline, the upper part of the buffer stratified tank 3 is connected with a toluene storage tank 4 through a pipeline; the top of the toluene storage tank 4 is provided with a breather valve 5, the top of the toluene storage tank 4 is connected with the bottom of the adsorption tower 1 through a connecting pipe 7; the single call valve 6 is arranged in the inner part of the end of the connecting pipe 7 close to the toluene storage tank 4, the opening pressure of the single call valve 6 is less than the opening pressure of the breather valve 5; when the pressure in the toluene storage tank 4 is greater than the set value, toluene is discharged from the single call valve 6 and enters the adsorption tower 1; when the pressure in the toluene storage tank 4 is less than the set value, external air enters the toluene storage tank through the breather valve 5.

[0016] The toluene storage tank 4 is connected with the top of the adsorption tower 1 through a toluene into adsorption tower pipeline 10, a pump is arranged on the toluene into adsorption tower pipeline 10; the adsorption tower 1 is connected with a toluene tail gas feed pipe 12 and a desalted water feed pipe 13; the adsorption tower 1 is connected with the connecting pipe 7 through a circulating pipe 11, a second vacuum pump is arranged on the circulating pipe 11; by arranging the circulating pipe 11, the toluene tail gas can be circulated and adsorbed.

[0017] In some embodiments, a first vacuum pump 8 and a flame arrestor 9 are arranged on the circulating pipe 11; by arranging the first vacuum pump 8, power is added for the transportation of toluene.

[0018] The steps of recycling toluene in toluene tail gas include:

[0019] The adsorption tower 1 is filled with activated carbon adsorbent, and the toluene tail gas is introduced into the adsorption tower 1 for adsorption; after one adsorption tower 1 is adsorbed, the toluene tail gas is introduced into another adsorption tower 1, and the adsorption tower 1 that is adsorbed is desorbed;

[0020] During desorption, the toluene is introduced into the adsorption tower 1 for washing first, then the desalted water and proportional toluene are used for washing, and finally the pure desalted water is used for washing, and the desalted water flow is 10 m3 / h; the material after desorption is filtered through the filter 2 and then enters the buffer stratification tank 3 for standing and stratification; the stratified toluene is introduced into the toluene storage tank 4.

[0021] The embodiment can introduce the toluene discharged after the pressure in the toluene storage tank is increased to a certain degree into the adsorption tower for adsorption and recovery in the adsorption tower, so that the environment is avoided from being polluted and resources are avoided from being wasted.

[0022] The above only describes preferred embodiments of the utility model and is not used for limiting the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A system capable of recycling toluene in toluene tail gas, comprising an adsorption tower (1), a filter (2) connected to the adsorption tower (1) by a pipeline, a buffer stratification tank (3) connected to the filter (2) by a pipeline, and a toluene storage tank (4) connected to the upper part of the buffer stratification tank (3) by a pipeline; a breather valve (5) is arranged at the top of the toluene storage tank (4), characterized in that, The top of the toluene storage tank (4) is connected with the bottom of the adsorption tower (1) through a connecting pipe (7); one end of the connecting pipe (7) close to the toluene storage tank (4) is internally provided with a single call valve (6), and the opening pressure of the single call valve (6) is less than that of the breathing valve (5).

2. The system capable of recovering toluene from toluene tail gas of claim 1, wherein, A first vacuum pump (8) and a fire arrester (9) are arranged on the connecting pipe (7).

3. The system capable of recovering toluene from toluene tail gas of claim 1, wherein, The toluene storage tank (4) is connected with the top of the adsorption tower (1) through a toluene-into-adsorption-tower pipeline (10), and the toluene-into-adsorption-tower pipeline (10) is provided with a pump.

4. The system capable of recovering toluene from toluene tail gas of claim 1, wherein, The top of the adsorption tower (1) is connected with the connecting pipe (7) through a circulating pipe (11).

5. The system capable of recovering toluene in toluene tail gas of claim 4, wherein, A second vacuum pump is arranged on the circulating pipe (11).

6. The system capable of recovering toluene from toluene tail gas of claim 1, wherein, The adsorption tower (1) is connected with a toluene tail gas feeding pipe (12) and a desalted water feeding pipe (13).

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