CN212369872U - System for absorbing and purifying byproduct hydrogen chloride gas in chlorination workshop section to form acid - Google Patents

System for absorbing and purifying byproduct hydrogen chloride gas in chlorination workshop section to form acid Download PDF

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Publication number
CN212369872U
CN212369872U CN202020576521.2U CN202020576521U CN212369872U CN 212369872 U CN212369872 U CN 212369872U CN 202020576521 U CN202020576521 U CN 202020576521U CN 212369872 U CN212369872 U CN 212369872U
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hydrogen chloride
hydrochloric acid
tower
chloride gas
acid
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CN202020576521.2U
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Chinese (zh)
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仇晓丰
葛锐敏
苟珍
王维超
邱鹭
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Hangzhou Dongri Energy Efficient Technology Co ltd
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Hangzhou Dongri Energy Efficient Technology Co ltd
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Abstract

The utility model relates to a chlorination workshop section by-product hydrogen chloride gas absorbs purification becomes sour system, it includes: a tail gas purification acid formation device for absorbing the byproduct hydrogen chloride gas into 31-33 wt% hydrochloric acid containing free chlorine; a dechlorination washing device for dechlorinating hydrochloric acid containing free chlorine to obtain 30-31 wt% dechlorinated hydrochloric acid; the analysis and concentration device is used for desorbing one part of dechlorinated hydrochloric acid into hydrogen chloride gas, and then absorbing the hydrogen chloride gas by the other part of dechlorinated hydrochloric acid to obtain 31-32 wt% industrial grade hydrochloric acid; the tail gas purification acid-forming device, the dechlorination washing device and the analysis concentration device are communicated in sequence. The utility model can absorb and purify the waste gas containing hydrogen chloride generated by the reaction of the chlorination reaction kettle into industrial hydrochloric acid, thereby realizing the recycling of the waste gas and conforming to the concept of energy conservation and environmental protection; the utility model discloses the hydrochloric acid and the hydrogen chloride gas that well produce can the utility model discloses the technology mesocycle is used, reduces the raw materials of technology, has reduced manufacturing cost.

Description

System for absorbing and purifying byproduct hydrogen chloride gas in chlorination workshop section to form acid
Technical Field
The utility model belongs to the environmental protection field of handling especially relates to a chlorination workshop section by-product hydrogen chloride gas absorbs purification becomes sour system.
Background
Hydrochloric acid is an aqueous solution of hydrogen chloride gas, has strong acidity, is very volatile, forms white acid mist with pungent odor in air, and is generally used as a solvent, a corrosive agent, an organic synthesis catalyst and the like in metallurgy, chemistry, food and leather industry. At present, the absorption of hydrogen chloride gas mainly adopts: adiabatic absorption tower (packed tower) and membrane absorber, the shortcoming is that the absorption efficiency of hydrogen chloride is lower, and adiabatic absorption tower easily appears flooding tower, bias flow phenomenon in addition, and the membrane absorber adopts the absorption tube, and intraductal absorption liquid forms the liquid film and has good absorption to gas, and the outside of tubes is cooled by water simultaneously, but the cooling water forms the scaling layer easily outside of tubes and influences heat exchange efficiency, needs regular shut down clearance and maintenance, and it is very inconvenient to use and running cost is higher.
The 2B oil is mainly used for preparing organic pigment intermediate 2B acid, pesticide chlortoluron herbicide, medicine intermediate and other organic chemicals, and is prepared by chlorination reaction of p-nitrotoluene, reduction by sodium sulfide and rectification. At present, in the 2B oil production process, byproduct hydrogen chloride gas and free chlorine exist in a chlorination reaction kettle in a chlorination workshop section of a workshop.
Chinese patent CN200610051995.X discloses a process for preparing high-purity hydrochloric acid by circularly absorbing hydrogen chloride byproducts, which comprises the steps of firstly, passing hydrogen chloride gas containing organic impurities through a condenser at-10 to-40 ℃ and a gas-liquid separator; then the gas containing a small amount of organic impurities from the gas-liquid separator is adsorbed by granular activated carbon; and introducing the adsorbed gas into a first-stage and a second-stage graphite falling film absorption towers, absorbing the gas by pure water to obtain the high-purity hydrochloric acid, absorbing unabsorbed hydrogen chloride by cold water, then feeding the unabsorbed hydrogen chloride and dilute acid in the graphite polypropylene falling film absorption tower into a cooling tank, and inputting the unabsorbed hydrogen chloride and the dilute acid into an inlet of the first-stage falling film absorption tower by a circulating pump for circulating absorption. The process has the advantages of large equipment investment, high energy consumption and low economic benefit.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a chlorination workshop section by-product hydrogen chloride gas absorbs and purifies into acid system to process the hydrogen chloride gas and free chlorine generated in the chlorination reaction kettle.
In order to achieve the purpose, the utility model provides a technical scheme does:
the utility model relates to a chlorination workshop section by-product hydrogen chloride gas absorbs purification becomes sour system, it includes: a tail gas purification acid formation device for absorbing the byproduct hydrogen chloride gas into 31-33 wt% hydrochloric acid containing free chlorine;
a dechlorination washing device for dechlorinating hydrochloric acid containing free chlorine to obtain 30-31 wt% dechlorinated hydrochloric acid;
the analysis and concentration device is used for desorbing one part of dechlorinated hydrochloric acid into hydrogen chloride gas, and then absorbing the hydrogen chloride gas by the other part of dechlorinated hydrochloric acid to obtain 31-32 wt% industrial grade hydrochloric acid;
the tail gas purification acid-forming device, the dechlorination washing device and the analysis concentration device are communicated in sequence.
Preferably, the tail gas purification acid-forming device comprises a washing tank, a cooler, a falling film absorber and a first absorption tower which are connected in sequence, the dechlorination washing device comprises a steam heater, a dechlorination separation tower and a hydrogen chloride washing tower which are connected in sequence, and the resolution and concentration device comprises a resolution tower and a second absorption tower which are connected in sequence; and a liquid outlet of the falling film absorber is connected with a liquid inlet of the dechlorination separation tower, and a liquid outlet of the dechlorination separation tower is respectively connected with a liquid inlet of the desorption tower and a liquid inlet of the second absorption tower through a dechlorination acid delivery pump.
Preferably, the first absorption tower and the second absorption tower are multistage gradient absorption towers.
Preferably, the system also comprises an external circulation cooler and a hydrochloric acid cooler, wherein the first absorption tower is connected with the external circulation cooler, and the hydrogen chloride washing tower is connected with the hydrochloric acid cooler.
Preferably, the liquid outlet at the bottom of the desorption tower is connected with the absorption liquid inlet at the top of the first absorption tower through a circulating pump to provide absorption liquid for the first absorption tower.
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
1. the utility model can absorb and purify the waste gas containing hydrogen chloride generated by the reaction of the chlorination reaction kettle into industrial hydrochloric acid, thereby realizing the recycling of the waste gas and conforming to the concept of energy conservation and environmental protection;
2. the hydrochloric acid and the hydrogen chloride gas generated in the utility model can be recycled in the process of the utility model, thereby reducing the raw materials of the process and lowering the production cost;
3. the utility model discloses earlier form the high concentration hydrochloric acid that contains free chlorine through the falling liquid film absorber, then through low pressure steam strip dechlorination, at last analysis, absorption obtain industrial hydrochloric acid, the process flow is short, exhaust-gas treatment is effectual, the hydrochloric acid volume of output is big, dechlorination is efficient, has better economic benefits.
Drawings
FIG. 1 is a schematic structural view of a device for purifying tail gas into acid according to the present invention;
FIG. 2 is a schematic view showing the connection structure of the dechlorination washing apparatus and the desorption concentration apparatus according to the present invention;
description of the labels in the schematic:
1-a washing tank; 2-a cooler; 3-a falling film absorber; 4-a first absorption column; 5-external circulating cooler; 6-steam heater; 7-dechlorination separation tower; an 8-hydrogen chloride scrubber; 9-a resolution tower; a 10-dechlorinated acid delivery pump; 11-hydrochloric acid cooler; 12-a circulation pump; 13-chlorination reaction kettle; 14-a second absorption column; 15-output pump.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to the following examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.
As shown in fig. 1 and fig. 2, the embodiment relates to a system for absorbing and purifying a byproduct hydrogen chloride gas into acid in a chlorination section, which is used for treating a hydrogen chloride gas generated in a chlorination reaction kettle 13, and includes a tail gas purification and acid formation system, a dechlorination washing device and an analytic concentration device that are communicated with each other, the tail gas purification and acid formation system includes a washing tank 1, a cooler 2, a falling film absorber 3 and a first absorption tower 4 that are connected in sequence, the dechlorination washing device includes a steam heater 6, a dechlorination separation tower 7 and a hydrogen chloride washing tower 8 that are connected in sequence, and the analytic concentration device includes an analytic tower 9 and a second absorption tower 14 that are connected in sequence.
The liquid outlet of the falling film absorber 3 is connected with the liquid inlet of the dechlorination separation tower 7, the liquid outlet of the dechlorination separation tower 7 is respectively connected with the liquid inlet of the desorption tower 9 and the liquid inlet of the second absorption tower 14 through a dechlorination acid delivery pump 10, and the exhaust ports of the chlorination reaction kettles 13 are communicated with the washing tank 1.
The first absorption tower 4 and the second absorption tower are both multi-stage gradient absorption towers.
The first absorption tower 4 is also connected with an external circulating cooler 5, and the hydrogen chloride washing tower 8 is also connected with a hydrochloric acid cooler 11. And a liquid outlet at the bottom of the desorption tower 9 is connected with an absorption liquid inlet at the top of the first absorption tower 4 through an output port of a circulating pump 12, so as to provide absorption liquid for the first absorption tower 4. And a gas outlet at the top of the desorption tower 9 is connected with a gas inlet at the bottom of the second absorption tower, so as to provide hydrogen chloride gas for the second absorption tower 14.
A process for absorbing and purifying byproduct hydrogen chloride gas in a chlorination workshop section into acid specifically comprises the following steps:
(1) purifying tail gas into acid: removing organic matters carried in hydrogen chloride gas generated in a chlorination reaction kettle 13 through a washing tank 1, cooling the hydrogen chloride gas by a cooler 2, then metering the hydrogen chloride gas into a falling film absorber 3, feeding the hydrogen chloride gas unabsorbed in the falling film absorber 3 into the bottom of a first absorption tower 4, feeding absorption liquid into the first absorption tower 4 from the top of the tower, performing multi-polar gradient absorption in the first absorption tower 4, feeding dilute hydrochloric acid generated at the bottom of the first absorption tower 4 into the falling film absorber 3 from the top of the falling film absorber 3, contacting the dilute hydrochloric acid with the hydrogen chloride gas from the chlorination reaction kettle 13 to form high-concentration 32% hydrochloric acid containing free chlorine, and discharging a large amount of absorption heat from the first absorption tower 4 through an external circulating cooler 5 to control the temperature of the generated dilute hydrochloric acid to be 40 ℃;
(2) dechlorination washing: 32% high-concentration hydrochloric acid containing free chlorine enters a dechlorination separation tower 7 from the top of the dechlorination separation tower 7, a steam heater 6 heats low-pressure steam of 0.2Mpa and then enters the bottom of the dechlorination separation tower 7, the steam strips the high-concentration hydrochloric acid from bottom to top, the free chlorine in the high-concentration hydrochloric acid is separated out and enters a hydrogen chloride washing tower 8 together with a large amount of hydrogen chloride gas, desalted water is used for washing the hydrogen chloride gas in the free chlorine gas, the washed free chlorine gas is discharged out of the hydrogen chloride washing tower 8, and the heat of dissolution of the hydrogen chloride gas in the hydrogen chloride washing tower 8 is removed out of the hydrogen chloride washing tower 8 through a hydrochloric acid cooler 11; the high-concentration hydrochloric acid in the dechlorination separation tower 7 is converted into 30.5 percent dechlorination hydrochloric acid;
(3) analyzing and concentrating: pressurizing and conveying a part of 30.5% dechlorinated hydrochloric acid to an analysis tower 9 through a dechlorinated acid conveying pump 10 for conventional analysis to generate hydrogen chloride gas and 18-22 wt% hydrochloric acid, and enabling the generated hydrogen chloride gas and the other part of dechlorinated hydrochloric acid to jointly enter a second absorption tower for hydrochloric acid concentration to obtain 31-32 wt% industrial-grade hydrochloric acid meeting the national standard; and the generated 18-22 wt% hydrochloric acid enters the first absorption tower through a circulating pump to be used as absorption liquid for recycling.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is merely an embodiment of the present invention, and the actual structure is not limited thereto. Therefore, those skilled in the art should understand that they can easily and effectively implement the present invention without departing from the spirit and scope of the present invention.

Claims (5)

1. A chlorination workshop section by-product hydrogen chloride gas absorbs purification becomes sour system, its characterized in that, it includes:
a tail gas purification acid formation device for absorbing the byproduct hydrogen chloride gas into 31-33 wt% hydrochloric acid containing free chlorine;
a dechlorination washing device for dechlorinating hydrochloric acid containing free chlorine to obtain 30-31 wt% dechlorinated hydrochloric acid;
the analysis and concentration device is used for desorbing one part of dechlorinated hydrochloric acid into hydrogen chloride gas, and then absorbing the hydrogen chloride gas by the other part of dechlorinated hydrochloric acid to obtain 31-32 wt% industrial grade hydrochloric acid;
the tail gas purification acid-forming device, the dechlorination washing device and the analysis concentration device are communicated in sequence.
2. The system for absorbing and purifying the byproduct hydrogen chloride gas at the chlorination workshop section into acid according to claim 1, wherein the tail gas purifying and acid forming device comprises a washing tank, a cooler, a falling film absorber and a first absorption tower which are connected in sequence, the dechlorination washing device comprises a steam heater, a dechlorination separation tower and a hydrogen chloride washing tower which are connected in sequence, and the desorption and concentration device comprises a desorption tower and a second absorption tower which are connected in sequence; and a liquid outlet of the falling film absorber is connected with a liquid inlet of the dechlorination separation tower, and a liquid outlet of the dechlorination separation tower is respectively connected with a liquid inlet of the desorption tower and a liquid inlet of the second absorption tower through a dechlorination acid delivery pump.
3. The system for absorbing and purifying the byproduct hydrogen chloride gas at the chlorination workshop section into acid according to claim 2, wherein the first absorption tower and the second absorption tower are multistage gradient absorption towers.
4. The system for absorbing and purifying the byproduct hydrogen chloride gas in the chlorination workshop section into acid according to claim 2, further comprising an external circulating cooler and a hydrochloric acid cooler, wherein the first absorption tower is connected with the external circulating cooler, and the hydrogen chloride washing tower is connected with the hydrochloric acid cooler.
5. The system for absorbing and purifying the byproduct hydrogen chloride gas at the chlorination workshop section into acid according to claim 2, wherein a liquid outlet at the bottom of the desorption tower is connected with an absorption liquid inlet at the top of the first absorption tower through a circulating pump to provide absorption liquid for the first absorption tower.
CN202020576521.2U 2020-04-17 2020-04-17 System for absorbing and purifying byproduct hydrogen chloride gas in chlorination workshop section to form acid Active CN212369872U (en)

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CN202020576521.2U CN212369872U (en) 2020-04-17 2020-04-17 System for absorbing and purifying byproduct hydrogen chloride gas in chlorination workshop section to form acid

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113213426A (en) * 2021-03-03 2021-08-06 眉山友禾科技有限公司 Preparation process of high-concentration hydrochloric acid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113213426A (en) * 2021-03-03 2021-08-06 眉山友禾科技有限公司 Preparation process of high-concentration hydrochloric acid

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