Saponification tail gas recovery and treatment device for epoxy chloropropane production

Abstract

The utility model discloses a saponification tail gas recovery and treatment device for epoxy chloropropane production, which comprises a cooler, a gas-liquid separation tank and a tail gas absorption tower which are sequentially arranged along the conveying direction of saponification tail gas, the top of the cooler is connected with a pipeline I connected with soap tail gas, and a pneumatic valve I is mounted on the pipeline I; the bottom of the cooler is connected with a pipeline II of saponified tail gas, the pipeline II is connected with the upper portion of the gas-liquid separation tank, a pneumatic valve II is installed on the pipeline II, and the pipeline I, the pneumatic valve I, the cooler, the pipeline II and the pneumatic valve II form a cooling channel of the saponified tail gas. The cooler is additionally arranged in front of the absorption tower, so that the content of organic matters in tail gas entering the absorption tower can be effectively reduced, and the treatment capacity of the absorption tower is greatly enhanced; and by arranging the gas-liquid separation tank, the organic compounds collected by the cooler are conveyed to the rectification system, so that the device has relatively high economic value and can generate relatively good economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical equipment and chemical unit operation absorption unit field, especially relates to a saponification tail gas recovery and treatment device for epoxy chloropropane production. BACKGROUND

[0002] Epoxy chloropropane is an important chemical raw material, generally adopts dichloropropanol and alkali to prepare through saponification reaction. Under the negative pressure condition, a large amount of process waste gas is produced in the whole production process, and the main components of these waste gases are 1, 3-dichloropropanol, 2, 3-dichloropropanol, epoxy chloropropane, 3-chloropropanediol, propylene aldehyde and the like. These process waste gases not only pollute the environment, but also cause the waste of resources. Therefore, seeking a suitable method to treat the process waste gas in the saponification process and recycle and utilize the useful components has very important practical significance and broad application prospect for the pollution of the environment and sustainable development. SUMMARY

[0003] The utility model solves the technical problem in the prior art and provides a saponification tail gas recovery and treatment device for epoxy chloropropane production process, which is reasonable in design, convenient to use and effective in recycling organic compounds.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] A saponification tail gas recovery and treatment device for epoxy chloropropane production, characterized in that the device comprises a cooler, a gas-liquid separation tank and a tail gas absorption tower arranged in sequence along the saponification tail gas conveying direction, the top of the cooler is connected with a pipeline I connected with the saponification tail gas, a pneumatic valve I is installed on the pipeline I, the bottom of the cooler is connected with a pipeline II connected with the upper part of the gas-liquid separation tank, a pneumatic valve II is installed on the pipeline II, the pipeline I, the pneumatic valve I, the cooler, the pipeline II and the pneumatic valve II constitute a cooling channel of the saponification tail gas, and cooling liquid pipelines and heat removal water pipelines are arranged at the upper part and the lower part of the cooler.

[0006] The top of the gas-liquid separation tank is connected with the lower part of the tail gas absorption tower through a pipeline III, the bottom of the gas-liquid separation tank is connected with a rectification system through a pipeline IV, a power pump is installed on the pipeline IV, and the top of the tail gas absorption tower is provided with an external discharge pipeline.

[0007] The technical problem solved by the utility model can also be realized by the following technical scheme, and the cooling channel is provided with at least two, and the two cooling channels are connected with the gas-liquid separation tank respectively.

[0008] The technical problems solved by the utility model also can be realized through the following technical scheme, the upper portion of the tail gas absorption tower is equipped with liquid inlet, the bottom of tail gas absorption tower is equipped with liquid outlet, the connecting circulation pipeline between liquid outlet and liquid inlet, the circulation pipeline includes circulation pipeline and the circulation pump installed on circulation pipeline.

[0009] The technical problems solved by the utility model also can be realized through the following technical scheme, the device also includes the control system for the automatic control of pneumatic valve I, pneumatic valve II, power pump and circulation pump work.

[0010] The technical problems solved by the utility model also can be realized through the following technical scheme, the control system includes controller, the remote pressure gauge set on pipeline I and pipeline II and the liquid level meter set in gas-liquid separation tank, and the remote pressure gauge and liquid level meter are all connected with the signal of controller, and pneumatic valve I, pneumatic valve II, power pump and circulation pump are all connected with the control of controller.

[0011] Compared with the prior art, the cooling channel with cooler is arranged in front of the absorption tower, which can effectively reduce the content of organic matter in the tail gas entering the absorption tower, greatly enhances the processing capacity of the absorption tower, and the organic compounds collected by the cooler are transported to the rectification system, which has high economic value and can produce good economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The structure diagram of the saponification tail gas recovery and treatment device for the production of epichlorohydrin.

[0013] In the drawing: 1-saponification tail gas, 2-remote pressure gauge, 3-pneumatic valve I, 4-power pump, 5-cooler, 6-circulation pump, 7-pneumatic valve II, 8-external discharge pipeline, 9-pipeline I, 10-pipeline II, 11-gas-liquid separation tank, 12-pipeline III, 13-absorption tower, 14-pipeline IV, 15-circulation pipeline. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0015] In the description of the utility model, it is necessary to understand that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0016] Referring to Figure 1 A kind of saponification tail gas recovery and processing device for epichlorohydrin production, the device includes cooling device 5, gas-liquid separation tank 11 and tail gas absorption tower 13 sequentially arranged along saponification tail gas 1 conveying direction, cooling device 5 top is connected with the pipeline I 9 that saponification tail gas 1 is connected, pipeline I 9 is equipped with pneumatic valve I 3, cooling device 5 bottom is connected with the pipeline II 10 that the upper portion of gas-liquid separation tank 11 is connected, pipeline II 10 is equipped with pneumatic valve II 7, the pipeline I 9, pneumatic valve I 3, cooling device 5, pipeline II 10 and pneumatic valve II 7 constitute the cooling channel of saponification tail gas, cooling fluid pipe and heat removal water pipe are equipped in the upper portion and lower portion of the cooling device;

[0017] Gas-liquid separation tank 11 top is connected with the lower portion of tail gas absorption tower 13 by pipeline III 12, gas-liquid separation tank 11 bottom is connected with rectification system by pipeline IV 14, pipeline IV 14 is equipped with power pump 4, tail gas absorption tower 13 top is equipped with external discharge pipeline 8.

[0018] The cooling channel is at least provided with two, and the two cooling channels are connected with the gas-liquid separation tank respectively, and the cooling channels are used alternately, wherein the pneumatic valve I 3 on the two cooling channels are interlocked, and the opening and closing states are different from each other;Pneumatic valve II 7 and pneumatic valve I 3 have the same opening and closing state, and pneumatic valve II 8 and pneumatic valve I 4 have the same opening and closing state.

[0019] The upper portion of the tail gas absorption tower 13 is provided with a liquid inlet, and the bottom portion of the tail gas absorption tower is provided with a liquid outlet, and the liquid inlet and the liquid outlet are connected by a circulating pipeline, and the circulating pipeline comprises a circulating pipeline 15 and a circulating pump 6 installed on the circulating pipeline 15.

[0020] The device further comprises a control system for automatically controlling the operation of the pneumatic valve I 3, the pneumatic valve II 7, the power pump 4 and the circulating pump 6.

[0021] The control system comprises a controller, a remote pressure gauge arranged on the pipeline I and the pipeline II, and a liquid level meter arranged in the gas-liquid separation tank, and the remote pressure gauge and the liquid level meter are signal connected with the controller, and the pneumatic valve I, the pneumatic valve II, the power pump and the circulating pump are control connected with the controller.

[0022] The working process of the saponification tail gas recovery and treatment device for the production of epichlorohydrin is as follows: when the saponification tail gas 1 enters the cooler 5, the pneumatic valves 3 and 7 are opened, the pneumatic valves 4 and 8 are closed, and the remote pressure gauge 2 records the pressure before entering the system. The cooler 5 uses -45 DEG C cooling liquid for deep cooling, most of the organic matters are condensed into the gas-liquid separation tank 11 at the temperature, the liquid 14 is collected and then sent to a treatment system, and the gas 12 continues to enter the absorption tower 13 and then is detected to meet the standard and is discharged. Since the trace water in the tail gas will condense and frost at the temperature and adhere to the surface of the heat exchange pipe, the cooling efficiency of the cooler is reduced and the resistance is increased, at this time, the pressure value of the remote pressure gauge 2 is gradually increased, when the pressure value is increased to a set value, the pneumatic valve 3 is closed and the interlocked pneumatic valve 4 is opened, and the cooling system is switched. The frosted cooler is defrosted by using hot water for standby after switching. The remote pressure gauge 9 records the system pressure change, if the displayed pressure value is increased to a certain range, it is indicated that the water absorption tower filler is blocked and needs to be dredged and replaced.

[0023] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A device for recovering and treating saponification tail gas for the production of epichlorohydrin, characterized by, The device comprises a cooler, a gas-liquid separation tank and a tail gas absorption tower arranged in sequence along the direction of saponification tail gas conveying, the top of the cooler is connected with a pipeline I connected with the saponification tail gas, the pipeline I is provided with a pneumatic valve I, the bottom of the cooler is connected with a pipeline II connected with the upper part of the gas-liquid separation tank, the pipeline II is provided with a pneumatic valve II, the pipeline I, the pneumatic valve I, the cooler, the pipeline II and the pneumatic valve II constitute a cooling channel of the saponification tail gas, the upper and lower parts of the cooler are provided with cooling liquid pipelines and heat removal water pipelines; the top of the gas-liquid separation tank is connected with the lower part of the tail gas absorption tower through a pipeline III, the bottom of the gas-liquid separation tank is connected with a rectification system through a pipeline IV, the pipeline IV is provided with a power pump, and the top of the tail gas absorption tower is provided with an external discharge pipeline.

2. The saponification off-gas recovery and treatment device for the production of epichlorohydrin according to claim 1, characterized in that, The cooling channel is provided with at least two, and the two cooling channels are connected with the gas-liquid separation tank respectively.

3. The saponification off-gas recovery and treatment device for the production of epichlorohydrin according to claim 1, characterized in that, The upper part of the tail gas absorption tower is provided with a liquid inlet, the bottom of the tail gas absorption tower is provided with a liquid outlet, a circulation pipeline is connected between the liquid inlet and the liquid outlet, and the circulation pipeline comprises a circulation pipeline and a circulation pump installed on the circulation pipeline.

4. The saponification off-gas recovery and treatment device for the production of epichlorohydrin according to claim 3, characterized in that, The device further comprises a control system for automatically controlling the working of the pneumatic valve I, the pneumatic valve II, the power pump and the circulation pump.

5. The saponification off-gas recovery and treatment device for the production of epichlorohydrin according to claim 4, characterized in that, The control system comprises a controller, remote pressure gauges arranged on the pipeline I and the pipeline II, and a liquid level meter arranged in the gas-liquid separation tank, the remote pressure gauges and the liquid level meter are signal-connected with the controller, and the pneumatic valve I, the pneumatic valve II, the power pump and the circulation pump are control-connected with the controller.

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