CN219319088U - Hydrochloric acid recovery system in phosphorous acid production tail gas - Google Patents
Hydrochloric acid recovery system in phosphorous acid production tail gas Download PDFInfo
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- CN219319088U CN219319088U CN202320355030.9U CN202320355030U CN219319088U CN 219319088 U CN219319088 U CN 219319088U CN 202320355030 U CN202320355030 U CN 202320355030U CN 219319088 U CN219319088 U CN 219319088U
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Abstract
The utility model relates to the field of phosphorous acid production, and provides a hydrochloric acid recovery system in tail gas generated in phosphorous acid production. Consists of three condensers, a tail gas absorption tower, a water seal tank and the like. Three condensers are connected in series in turn for cooling the incoming gas. Hydrochloric acid in each storage tank flows back to the condenser of the current stage or the previous stage in a circulating pump or overflow mode. The system is provided with a tail gas absorption tower, the unabsorbed hydrochloric acid in the three-stage condenser is absorbed again through the tail gas absorption tower, residual gas which is not absorbed in the absorption tower is absorbed for the last time through a water seal tank, and the residual gas after multiple times of absorption is sent into a tail gas absorption total tower; after the absorption is completed, the residual gas in each storage tank is sent into a tail gas absorption total tower for treatment; according to the technical scheme, through the three condensers, the tail gas absorption tower and the water seal tank, the modes of condensation, backflow, water absorption and the like are matched, hydrochloric acid in the tail gas of the hydrolysis tower is fully absorbed, waste is less, and the tail gas absorption capacity of the tail gas absorption total tower is less.
Description
Technical Field
The utility model relates to the field of phosphorous acid production, in particular to a hydrochloric acid recovery system in tail gas generated in phosphorous acid production.
Background
The production process of phosphorous acid is that hydrochloric acid and phosphorus trichloride are hydrolyzed at high temperature, so that phosphorous acid and hydrochloric acid are obtained after hydrolysis, liquid phosphorous acid and partial hydrochloric acid are left at the bottom of a hydrolysis tower, pumped out and sent into a deacidification tower for treatment, and then byproduct hydrochloric acid is extracted and a high-purity phosphorous acid product is obtained. The tail gas discharged from the top of the hydrolysis tower contains a large amount of gaseous hydrogen chloride gas and water vapor.
Since hydrochloric acid is one of the raw materials for reaction and hydrochloric acid is an important raw material in chemical production, if gaseous hydrochloric acid is directly sent into a tail gas absorption total tower of a workshop for neutralization treatment, material waste is caused, chemicals for tail gas absorption are wasted, and the workload of tail gas absorption is increased. Therefore, in the production process, hydrochloric acid in the tail gas can be recovered, the tail gas is condensed, hydrogen chloride and water vapor are condensed to become hydrochloric acid and are collected, and because the tail gas passes through a condenser at a higher speed, the complete condensation recovery of the hydrochloric acid can not be ensured, and part of unrecovered gas containing the hydrochloric acid still needs to be absorbed by a tail gas absorption total tower.
Disclosure of Invention
The utility model aims to solve the problem of recycling hydrochloric acid in the process of producing phosphorous acid by a hydrolysis method, avoid the waste of hydrochloric acid and the load on a tail gas absorption total tower, and provide a recycling system of hydrochloric acid in tail gas in the process of producing phosphorous acid by multistage condensation recycling.
The technical scheme adopted by the utility model is as follows:
the hydrochloric acid recovery system in the tail gas of the phosphorous acid production comprises at least one condensate receiving tank, a first-stage condenser and a hydrochloric acid finished product tank, wherein circulating cooling water is introduced into the first-stage condenser, the tail gas containing hydrochloric acid in the hydrolysis tower enters the first-stage condenser to be condensed, the condensed liquid hydrochloric acid enters the condenser receiving tank, the hydrochloric acid collected by the condenser receiving tank enters the hydrochloric acid finished product tank, the system also comprises a second-stage condenser, a third-stage condenser and a tail gas absorption tower, the non-liquefied gas in the first-stage condenser and the hydrochloric acid finished product tank enters the second-stage condenser through a pipeline, the non-liquefied gas in the second-stage condenser and the hydrochloric acid finished product tank enters the third-stage condenser through a pipeline, the bottom of the third-stage condenser is connected with an intermediate acid receiving tank, and the non-liquefied gas in the third-stage condenser and the intermediate acid receiving tank enter the tail gas absorption tower through a pipeline; the bottom of the receiving tower is provided with a hydrochloric acid receiving tank, a filler is arranged above the hydrochloric acid receiving tank, an air inlet of the tail gas absorbing tower is positioned between the hydrochloric acid receiving tank and the filler, the top of the tail gas absorbing tower is provided with a tail gas outlet, and the tail gas outlet is connected with a tail gas absorbing total tower of a workshop; and the hydrochloric acid in the hydrochloric acid receiving tank and the hydrochloric acid in the intermediate acid receiving tank respectively flow back to the third condenser and the second condenser.
Further, the bottoms of the intermediate acid receiving tank and the hydrochloric acid receiving tank are respectively connected with a circulating pump, hydrochloric acid in the intermediate acid receiving tank is sent into the third condenser for internal circulation by the circulating pump, and the hydrochloric acid in the hydrochloric acid receiving tank is circulated at the top of the tail gas absorbing tower by the circulating pump.
Further, a liquid distribution pipe is arranged at the top in the tail gas absorption tower and positioned above the filler, and the liquid distribution pipe is connected with the output end of the corresponding circulating pump.
Further, a water seal groove is formed in one side of the tail gas absorption tower, the water seal groove is connected with pure water input, an exhaust port at the top of the tail gas absorption tower is inserted below the liquid level of the water seal groove through a pipeline, and the top of the water seal groove is connected with a tail gas absorption total tower of a workshop through a pipeline.
Further, the water seal tank is connected with a circulating pump, and the circulating pump pumps hydrochloric acid from the water seal tank and sends the hydrochloric acid into the third condenser.
Further, the hydrochloric acid finished product tank is provided with a tank wagon interface, the hydrochloric acid finished product pipe is connected with a hydrochloric acid extraction pump, and the output end of the hydrochloric acid extraction pump is respectively connected with the hydrochloric acid metering tank and the hydrochloric acid storage tank through branch pipelines.
And the hydrochloric acid receiving tank, the intermediate acid receiving tank and the top of the hydrochloric acid receiving tank are respectively connected with the tail gas absorption total tower through pipelines, and valves are arranged on the pipelines.
After the technical scheme is adopted, the beneficial effects of the utility model are as follows:
through the setting of tertiary condenser in series, the gaseous continuous condensation that gets into of next level condenser of uncondensed in the last level condenser, the hydrochloric acid after the condensation gets into corresponding storage tank, and the hydrochloric acid of each storage tank is concentrated in the hydrochloric acid finished product jar of collecting by the difference in height overflow between the storage tank under the guide of pipeline, and concentrated hydrochloric acid finished product of collecting can direct loading or send to in big storage tank or the metering tank, the reuse of the production of being convenient for.
Hydrochloric acid in each storage tank flows back to the condenser of the current stage or the previous stage in a circulating pump or overflow mode, and the absorption of gaseous hydrochloric acid can be quickened in the backflow process, so that the recovery of the hydrochloric acid is more complete.
The system is provided with a tail gas absorption tower, the unabsorbed hydrochloric acid in the three-stage condenser is absorbed again through the tail gas absorption tower, residual gas which is not absorbed in the absorption tower is absorbed for the last time through a water seal tank, and the residual gas after multiple times of absorption is sent into a tail gas absorption total tower; after the absorption is completed, the residual gas in each storage tank is sent into a tail gas absorption total tower for treatment;
according to the technical scheme, through the three condensers, the tail gas absorption tower and the water seal tank, the modes of condensation, backflow, water absorption and the like are matched, hydrochloric acid in the tail gas of the hydrolysis tower is fully absorbed, waste is less, and the tail gas absorption capacity of the tail gas absorption total tower is less.
Drawings
Fig. 1 is a schematic diagram of a system of the present utility model.
Fig. 2 is a schematic structural diagram of the tail gas absorption tower.
Description of the embodiments
The following detailed description of the utility model refers to the accompanying drawings, which illustrate specific embodiments of the utility model:
as shown in figure 1, the hydrochloric acid recovery system in the tail gas of the phosphorous acid production comprises a primary condenser 1, a hydrochloric acid receiving tank 2, a secondary condenser 3, a hydrochloric acid finished product tank 4, a tertiary condenser 5, an intermediate acid receiving tank 6, a tail gas absorption tower 7, a water seal tank 8 and related pipelines and pumps. The three condensers are sequentially connected in series, and the three condensers are used for cooling the entering gas through circulating cooling water respectively.
The high-temperature gas containing hydrogen chloride, water vapor and a small amount of other substances at the top of the hydrolysis tower enters a primary condenser 1, part of the gas is liquefied in the primary condenser 1, liquefied hydrochloric acid enters a hydrochloric acid receiving tank 2 from a discharge outlet at the bottom of the primary condenser 1 through a pipeline to be collected, uncondensed gas in the primary condenser 1 enters a secondary condenser 3 from the side surface of the bottom of the primary condenser through a pipeline to be continuously condensed, and the condensed hydrochloric acid in the secondary condenser 3 enters a hydrochloric acid finished product tank 4 from a discharge outlet at the bottom of the secondary condenser through a pipeline; the non-liquefied gas in the secondary condenser 3 enters the tertiary condenser 5 from the side surface of the bottom of the secondary condenser through a pipeline for condensation, and the condensed hydrochloric acid enters the intermediate acid receiving tank 6 through a pipeline for collection; after three-stage condensation, a small amount of gas containing hydrochloric acid and high boiling point acid still exists, and is sent into the tail gas absorption tower 7 from the side surface of the bottom of the three-stage condenser 5 through a pipeline, and enters from the middle part of the tail gas absorption tower 7.
The bottom of the tail gas absorption tower 7 is provided with a hydrochloric acid receiving groove 71, pure water passes through the hydrochloric acid receiving groove 71, a filler 72 is arranged in the middle of the hydrochloric acid receiving groove 71, a liquid separating pipe 73 is arranged at the top of the hydrochloric acid receiving groove, and tail gas enters the tail gas absorption tower 7 from an air inlet 76 below the filler 72. A circulation pump 74 is installed outside the tail gas absorption tower, the circulation pump 74 pumps out the liquid in the hydrochloric acid receiving tank 71, a liquid separating pipe 75 sent to the top of the circulation pump is sprayed downwards, the hydrochloric acid gas and the liquid are contacted and absorbed in the packing section 72, and the hydrochloric acid gas and the liquid fall into the hydrochloric acid receiving tank 71. The top of the tail gas absorption tower 7 is provided with an exhaust port 75, and a small amount of residual gas after tail gas absorption treatment is discharged from the exhaust port 75 and is led into the water seal tank 8 through a pipeline. The water seal groove 8 is a seal groove, pure water is filled in the water seal groove, the tail gas pipeline is inserted below the liquid level, and residual gas is finally absorbed in the pure water. The gas which cannot be absorbed is guided to the tail gas absorption total tower 10 in the workshop from the pipeline at the top of the water seal tank 8 for treatment.
In order to improve the liquefying and absorbing effects of the condenser, the hydrochloric acid in the water seal tank 8, the hydrochloric acid receiving tank 71 and the intermediate acid receiving tank 6 enters the three-stage condenser 5 in a circulating pump or overflow mode, absorbs the gas therein, and finally returns to the intermediate acid receiving tank 6. The excessive hydrochloric acid in the intermediate acid receiving tank 6 enters the secondary condenser 3 in an overflow mode, absorbs the gas in the hydrochloric acid receiving tank and finally enters the hydrochloric acid finished product tank 4. The hydrochloric acid in the hydrochloric acid receiving tank 2 finally enters the hydrochloric acid finished product tank 4 in an overflow manner.
The tops of the hydrochloric acid receiving tank 2, the intermediate acid receiving tank 6 and the hydrochloric acid finished product tank 4 are respectively connected with a tail gas absorption total tower of a workshop through pipelines and valves, and after the absorption is finished, the residual gas in each storage tank is sent to the tail gas absorption total tower 10 for treatment.
All install parts such as valve, manometer, flowmeter that control is necessary on each pipeline of this system, the control of being convenient for long-range.
The hydrochloric acid finished product tank 4 is provided with a tank wagon interface and is connected with a hydrochloric acid sampling pump 9, when the liquid level in the hydrochloric acid finished product tank is higher, hydrochloric acid in the hydrochloric acid finished product tank is conveyed into a hydrochloric acid storage tank or a hydrochloric acid metering tank through the hydrochloric acid sampling pump 9, and the recovery of the hydrochloric acid is completed.
Claims (7)
1. The hydrochloric acid recovery system in the tail gas of phosphorous acid production comprises at least one condensate receiving tank, a first-stage condenser and a hydrochloric acid finished product tank, wherein circulating cooling water is introduced into the first-stage condenser, the tail gas containing hydrochloric acid in the hydrolysis tower enters the first-stage condenser to be condensed, the condensed liquid hydrochloric acid enters the condenser receiving tank, the hydrochloric acid collected by the condenser receiving tank enters the hydrochloric acid finished product tank, and the system is characterized by further comprising a second-stage condenser, a third-stage condenser and a tail gas absorption tower, the non-liquefied gas in the first-stage condenser and the entering hydrochloric acid finished product tank enters the second-stage condenser through a pipeline, the non-liquefied gas in the second-stage condenser and the hydrochloric acid finished product tank enters the third-stage condenser through a pipeline, the bottom of the third-stage condenser is connected with an intermediate acid receiving tank, and the non-liquefied gas in the third-stage condenser and the intermediate acid receiving tank enters the tail gas absorption tower through a pipeline; the bottom of the absorption tower is provided with a hydrochloric acid receiving tank, a filler is arranged above the hydrochloric acid receiving tank, an air inlet of the tail gas absorption tower is positioned between the hydrochloric acid receiving tank and the filler, the top of the tail gas absorption tower is provided with a tail gas outlet, and the tail gas outlet is connected with a tail gas absorption total tower of a workshop; and the hydrochloric acid in the hydrochloric acid receiving tank and the hydrochloric acid in the intermediate acid receiving tank respectively flow back to the third condenser and the second condenser.
2. The system for recycling hydrochloric acid in tail gas from phosphorous acid production according to claim 1, wherein the bottoms of the intermediate acid receiving tank and the hydrochloric acid receiving tank are respectively connected with a circulating pump, hydrochloric acid in the intermediate acid receiving tank is sent into the third condenser for internal circulation by the circulating pump, and hydrochloric acid in the hydrochloric acid receiving tank is circulated at the top of the tail gas absorbing tower by the circulating pump.
3. The hydrochloric acid recovery system in the tail gas of the phosphorous acid production according to claim 2, wherein a liquid separating pipe is arranged at the top in the tail gas absorption tower, the liquid separating pipe is positioned above the filler, and the liquid separating pipe is connected with the output end of the corresponding circulating pump.
4. The hydrochloric acid recovery system in the tail gas of the phosphorous acid production according to claim 1, wherein a water seal tank is arranged on one side of the tail gas absorption tower, the water seal tank is connected with pure water input, an exhaust port at the top of the tail gas absorption tower is inserted below the liquid level of the water seal tank through a pipeline, and the top of the water seal tank is connected with a tail gas absorption total tower of a workshop through a pipeline.
5. The system for recovering hydrochloric acid from a tail gas from the production of phosphorous acid according to claim 4, wherein the water seal tank is connected with a circulation pump, and the circulation pump pumps hydrochloric acid from the water seal tank and sends the hydrochloric acid to the third condenser.
6. The hydrochloric acid recovery system in the tail gas of the phosphorous acid production according to claim 1, wherein the hydrochloric acid finished product tank is provided with a tank wagon interface, a hydrochloric acid finished product pipe is connected with a hydrochloric acid extraction pump, and the output end of the hydrochloric acid extraction pump is respectively connected with a hydrochloric acid metering tank and a hydrochloric acid storage tank through branch pipelines.
7. The system for recovering hydrochloric acid from the tail gas of the production of phosphorous acid according to claim 1, wherein the hydrochloric acid receiving tank, the intermediate acid receiving tank and the top of the hydrochloric acid receiving tank are respectively connected with the tail gas absorption total tower through pipelines, and valves are arranged on the pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320355030.9U CN219319088U (en) | 2023-03-01 | 2023-03-01 | Hydrochloric acid recovery system in phosphorous acid production tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320355030.9U CN219319088U (en) | 2023-03-01 | 2023-03-01 | Hydrochloric acid recovery system in phosphorous acid production tail gas |
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| CN219319088U true CN219319088U (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320355030.9U Active CN219319088U (en) | 2023-03-01 | 2023-03-01 | Hydrochloric acid recovery system in phosphorous acid production tail gas |
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