CN201711074U - Recovery system for tail gas produced by water treatment agent HEDP - Google Patents
Recovery system for tail gas produced by water treatment agent HEDP Download PDFInfo
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- CN201711074U CN201711074U CN2010202247839U CN201020224783U CN201711074U CN 201711074 U CN201711074 U CN 201711074U CN 2010202247839 U CN2010202247839 U CN 2010202247839U CN 201020224783 U CN201020224783 U CN 201020224783U CN 201711074 U CN201711074 U CN 201711074U
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- hydrochloric acid
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- acid tank
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Abstract
The utility model belongs to the field of chemical equipment, which discloses a recovery system for tail gas produced by water treatment agent HEDP (1-Hydroxy Ethylidene-1,1-Diphosphonic Acid). The system comprises a primary falling film absorption tower, a secondary falling film absorption tower, a tertiary falling film absorption tower, a protective tank, a primary hydrochloric acid tank and a secondary hydrochloric acid tank. The system adds an acetic acid recovery device comprising the primary falling film absorption tower and the protective groove in front of an existing HCL absorption system, can save 35 Kg of glacial acetic acid and 17 Kg of phosphorous trichloride for producing 1 ton of HEDP, and reduces the impurity content in byproduct hydrochloric acid, the content of glacial acetic acid in hydrochloric acid is reduced to about 0.3 percent, and the total phosphorus content is reduced to 2 PPM (calculating by P043), and the system reaches the required discharge content of phosphor by the environmental protection requirement in Taihu basin area.
Description
Technical field
The utility model belongs to the chemical industry equipment field, relates to a kind of water treatment agent HEDP and produces exhaust gas recovery system.
Background technology
At present, the production method of HEDP mainly contains: phosphorous acid-acetyl chloride method; Phosphorous acid-acetic anhydride method; Phosphorous acid-phosphorus pentoxide-method of acetic acid; Orthophosphoric acid-acetic anhydride method; Orthophosphoric acid-acetic acid-acetyl chloride method; Phosphorus trichloride-glacial acetic acid-water law; Phosphorus trichloride-acetic acid-acetyl chloride method.Wherein phosphorus trichloride-glacial acetic acid-water law production HEDP is the domestic production method that has comparative advantage, and abroad some major companies also use this method.Phosphorus trichloride-glacial acetic acid-water law is produced HEDP, and its key reaction formula is as follows:
PCl
3+3H
2O——H
3PO
3+3HCl (1)
PCl
3+3CH
3COOH——H
3PO
3+3CH
3COCl (2)
In the HEDP production process, because of raw materials used phosphorus trichloride and intermediate product chloroacetic chloride all belong to the easily raw material of gasification of low boiling, so in process of production, have inevitably a small amount of chloroacetic chloride and phosphorus trichloride along with hydrogen chloride gas enter in the byproduct hydrochloric acid with hydrochloric acid in water be reacted into acetic acid and phosphorous acid, not only cause the waste of raw material, but also influence the quality (containing have an appointment 2.5% acetic acid, 0.5% phosphorous acid in the hydrochloric acid) of hydrochloric acid.
Summary of the invention
The purpose of this utility model is the above-mentioned deficiency at prior art, provides a kind of water treatment agent HEDP to produce exhaust gas recovery system.
The technical solution of the utility model is:
Water treatment agent HEDP produces exhaust gas recovery system, and this system comprises one-level film-falling absorption tower, secondary film-falling absorption tower, three grades of film-falling absorption towers, protection groove, one-level hydrochloric acid tank, secondary hydrochloric acid tank; Wherein the air inlet of one-level film-falling absorption tower links to each other with HEDP esterifying kettle tail gas output, water inlet is connected with water pipe, gas vent is connected with the gas feed of protection groove, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of the careless groove of protection, and the circulation fluid inlet links to each other by circulating pump with the absorption liquid outlet of the careless groove of protection; The water inlet of protection groove links to each other with the deionized water pipeline, and gas vent links to each other with the air inlet of secondary film-falling absorption tower, establishes a branch road between the absorption liquid outlet of bottom and the circulating pump, reclaims conveyance conduit by circulating pump and acetic acid and links to each other; The water inlet of secondary film-falling absorption tower is connected with water pipe, gas vent is connected with the gas feed of one-level hydrochloric acid tank, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of one-level hydrochloric acid tank, and the circulation fluid inlet links to each other by circulating pump with the liquid outlet of one-level hydrochloric acid tank; The gas vent of one-level hydrochloric acid tank links to each other with the air inlet of three grades of film-falling absorption towers, establishes a branch road between the absorption liquid outlet of bottom and the circulating pump, links to each other with the hydrochloric acid conveyance conduit by circulating pump; The water inlet of three grades of film-falling absorption towers is connected with water pipe, gas vent is connected with the gas feed of secondary hydrochloric acid tank, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of secondary hydrochloric acid tank, and the circulation fluid inlet links to each other by circulating pump with the liquid outlet of secondary hydrochloric acid tank; The outlet of the absorption liquid of secondary hydrochloric acid tank is connected with pipeline between one-level hydrochloric acid tank and the circulating pump, links to each other with the hydrochloric acid conveyance conduit by circulating pump, and secondary hydrochloric acid tank and the pipeline between the circulating pump are established a branch road and supplied waterpipe and link to each other.
Described circulating pump is provided with branch road with pipeline between the one-level film-falling absorption tower and links to each other with the hydrochloric acid conveyance conduit.
Pipeline between described circulating pump and the three grades of film-falling absorption towers also is provided with a branch road, by circulating pump with supply waterpipe and link to each other.
Above-mentioned all connections are pipeline and connect.
The beneficial effects of the utility model:
The utility model had increased the acetic acid reuse absorption plant of mainly being made up of one-level film-falling absorption tower, protection groove before existing HCL absorption system, have following advantage:
One ton of HEDP of every production does not consume glacial acetic acid 220Kg, phosphorus trichloride 710Kg when 1, setting up acetic acid reuse absorption plant.By glacial acetic acid and the phosphorous acid in the exhaust gas recovery system reuse hydrochloric acid of the present utility model, one ton of HEDP of every production consumes glacial acetic acid 185Kg, phosphorus trichloride 693Kg, but one ton of HEDP conservation of then every production consumes glacial acetic acid 35Kg, phosphorus trichloride 17Kg.
2, the utility model exhaust gas recovery system has reduced the impurity content in the byproduct hydrochloric acid, contains glacial acetic acid in the hydrochloric acid and is reduced to approximately 0.3%, and total phosphorus content is reduced to 2PPM (with PO
4 3-Meter), reached the phosphorus discharging content of Taihu Lake basin environmental requirement.
Description of drawings
Fig. 1 is that the utility model water treatment agent HEDP produces exhaust gas recovery system technological process and equipment drawing.
The 1st, the one-level film-falling absorption tower, the 2nd, the secondary film-falling absorption tower, 3 is three grades of film-falling absorption towers, the 4th, the protection groove, the 5th, the one-level hydrochloric acid tank, 6 times the level hydrochloric acid tank is that 7～12 are circulating pump.
The specific embodiment
A kind of water treatment agent HEDP produces exhaust gas recovery system, and this system comprises one-level film-falling absorption tower 1, secondary film-falling absorption tower 2, three grades of film-falling absorption towers 3, protection groove 4, one-level hydrochloric acid tank 5, secondary hydrochloric acid tank 6.
The air inlet of one-level film-falling absorption tower 1 links to each other with the outlet of HEDP esterifying kettle tail gas, water inlet is connected with water pipe, gas vent is connected with the gas feed of protection groove 4, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of protection groove 4, and the circulation fluid inlet links to each other by circulating pump 7 with the absorption liquid outlet of protection groove 4; The water inlet of protection groove 4 links to each other with the deionized water pipeline, and gas vent links to each other with the air inlet of secondary film-falling absorption tower 2, establishes a branch road between the absorption liquid outlet of bottom and the circulating pump 7, reclaims conveyance conduit by circulating pump 8 and acetic acid and links to each other.
Contain a large amount of HCL gas in the HEDP esterifying kettle tail gas, also contain a spot of phosphorus trichloride and chloroacetic chloride.Phosphorus trichloride and chloroacetic chloride very easily react with water and generate glacial acetic acid and phosphorous acid.When HEDP esterifying kettle tail gas during by one-level film-falling absorption tower 1 phosphorus trichloride and chloroacetic chloride and section H CL gas absorbed by water, glacial acetic acid and phosphorous acid are difficult for gasification, can not enter the hydrochloric acid absorption system of back segment again.After the moisture content in the absorption liquid was less than 10%, absorption liquid changed protection groove 4 over to, detects acetic acid, phosphorous acid content; the qualified circulating pump 8 that passes through pumps into acetic acid recovery conveyance conduit; HEDP is produced in reuse, and is underproof as absorption liquid, enters the one-level film-falling absorption tower as circulating absorption solution through circulating pump 7.Another part HCL gas is not absorbed by water; enter protection groove 4 from the gas vent of one-level film-falling absorption tower 1; absorption liquid can reduce the solubility to hydrogen chloride gas along with the minimizing of moisture content, and the HCL gas that does not dissolve enters secondary film-falling absorption tower 2 together with unabsorbed HCL gas.
The water inlet of secondary film-falling absorption tower 2 is connected with water pipe, gas vent is connected with the gas feed of one-level hydrochloric acid tank 5, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of one-level hydrochloric acid tank 5, and the circulation fluid inlet links to each other by circulating pump 9 with the liquid outlet of one-level hydrochloric acid tank 5; The gas vent of one-level hydrochloric acid tank 5 links to each other with the air inlet of three grades of film-falling absorption towers 3, establishes a branch road between the absorption liquid outlet of bottom and the circulating pump 9, links to each other with the hydrochloric acid conveyance conduit by circulating pump 10.The water inlet of three grades of film-falling absorption towers 3 is connected with water pipe, gas vent is connected with the gas feed of secondary hydrochloric acid tank 6, the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of secondary hydrochloric acid tank 6, and the circulation fluid inlet links to each other by circulating pump 11 with the liquid outlet of secondary hydrochloric acid tank 6; The outlet of the absorption liquid of secondary hydrochloric acid tank 6 is connected with pipeline between one-level hydrochloric acid tank 5 and the circulating pump 10, links to each other with the hydrochloric acid conveyance conduit by circulating pump 10, and secondary hydrochloric acid tank 6 and the pipeline of 11 of circulating pumps are established a branch road and supplied waterpipe and link to each other.The gas vent of secondary hydrochloric acid tank 6 communicates with atmosphere by pipeline, is used for tail gas igniting emptying.
A large amount of HCL gases enter secondary film-falling absorption tower 2 and are absorbed by water, form hydrochloric acid and enter one-level hydrochloric acid tank 5, detect concentration of hydrochloric acid and purity in the one-level hydrochloric acid tank 5, the qualified circulating pump 10 input hydrochloric acid conveyance conduits that pass through underproofly enter secondary film-falling absorption tower 2 as circulating absorption solution once more by circulating pump 9.Unabsorbed HCL gas enters three grades of film-falling absorption towers 3, in three grades of film-falling absorption towers 3, absorbed formation hydrochloric acid by water once more and enter secondary hydrochloric acid tank 6, hydrochloric acid in the secondary hydrochloric acid tank 6 is qualified after testing, through circulating pump 10 input hydrochloric acid conveyance conduits, underproofly enter three grades of film-falling absorption towers 3 once more as circulating absorption solution by circulating pump 11.Absorb the HCL that only contains denier in the tail gas of back through three grades of film-falling absorption towers 3, reached emission request, the emptying of can lighting a fire.
Described circulating pump 7 is provided with branch road with pipeline between the one-level film-falling absorption tower 1 and links to each other with the hydrochloric acid conveyance conduit.When one of them broke down when circulating pump 7 or circulating pump 8, the absorption liquid in the protection groove can enter one-level film-falling absorption tower 1 or acetic acid reclaims conveyance conduit by another circulating pump.
Pipeline between described circulating pump 11 and the three grades of film-falling absorption towers 3 also is provided with a branch road, by circulating pump 12 with supply waterpipe and link to each other.
Above-mentioned all connected modes are pipeline and connect.
Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and scope are limited; do not breaking away under the utility model design concept prerequisite; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection domain of the present utility model, the technology contents that the utility model is asked for protection all is documented in claims.
Claims (3)
1. a water treatment agent HEDP produces exhaust gas recovery system, it is characterized in that this system comprises one-level film-falling absorption tower (1), secondary film-falling absorption tower (2), three grades of film-falling absorption towers (3), protection groove (4), one-level hydrochloric acid tank (5), secondary hydrochloric acid tank (6); Wherein the air inlet of one-level film-falling absorption tower (1) links to each other with HEDP esterifying kettle tail gas output, water inlet is connected with water pipe, gas vent is connected with the gas feed of protection groove (4), the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of the careless groove of protection (4), and the circulation fluid inlet links to each other by circulating pump (7) with the absorption liquid outlet of the careless groove of protection (4); The water inlet of protection groove (4) links to each other with the deionized water pipeline, and gas vent links to each other with the air inlet of secondary film-falling absorption tower (2), establishes a branch road between the absorption liquid outlet of bottom and the circulating pump (7), reclaims conveyance conduit by circulating pump (8) and acetic acid and links to each other; The water inlet of secondary film-falling absorption tower (2) is connected with water pipe, gas vent is connected with the gas feed of one-level hydrochloric acid tank (5), the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of one-level hydrochloric acid tank (5), and the circulation fluid inlet links to each other by circulating pump (9) with the liquid outlet of one-level hydrochloric acid tank (5); The gas vent of one-level hydrochloric acid tank (5) links to each other with the air inlet of three grades of film-falling absorption towers (3), establishes a branch road between the absorption liquid outlet of bottom and the circulating pump (9), links to each other with the hydrochloric acid conveyance conduit by circulating pump (10); The water inlet of three grades of film-falling absorption towers (3) is connected with water pipe, gas vent is connected with the gas feed of secondary hydrochloric acid tank (6), the absorption liquid outlet of bottom links to each other with the absorption liquid inlet of secondary hydrochloric acid tank (6), and the circulation fluid inlet links to each other by circulating pump (11) with the liquid outlet of secondary hydrochloric acid tank (6); The absorption liquid outlet of secondary hydrochloric acid tank (6) is connected with the pipeline between one-level hydrochloric acid tank (5) and the circulating pump (10), link to each other with the hydrochloric acid conveyance conduit by circulating pump (10), secondary hydrochloric acid tank (6) and the pipeline between circulating pump (11) are established a branch road and are supplied waterpipe and link to each other; Above-mentioned all connected modes are pipeline and connect.
2. water treatment agent HEDP according to claim 1 produces exhaust gas recovery system, and described circulating pump (7) is provided with branch road with pipeline between the one-level film-falling absorption tower (1) and links to each other with the hydrochloric acid conveyance conduit, describedly is connected to the pipeline connection.
3. water treatment agent HEDP according to claim 1 produces exhaust gas recovery system, pipeline between described circulating pump (11) and the three grades of film-falling absorption towers (3) also is provided with a branch road, by circulating pump (12) with supply waterpipe and be connected, the described pipeline that is connected to connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202247839U CN201711074U (en) | 2010-06-12 | 2010-06-12 | Recovery system for tail gas produced by water treatment agent HEDP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202247839U CN201711074U (en) | 2010-06-12 | 2010-06-12 | Recovery system for tail gas produced by water treatment agent HEDP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201711074U true CN201711074U (en) | 2011-01-19 |
Family
ID=43457069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202247839U Expired - Lifetime CN201711074U (en) | 2010-06-12 | 2010-06-12 | Recovery system for tail gas produced by water treatment agent HEDP |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201711074U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274675A (en) * | 2010-06-12 | 2011-12-14 | 江苏大明科技有限公司 | Recovery system of tail gas from water treatment agent HEDP production |
| CN102302890A (en) * | 2011-04-29 | 2012-01-04 | 苏州市吴赣药业有限公司 | Hydrogen chloride gas circulating recovery system |
-
2010
- 2010-06-12 CN CN2010202247839U patent/CN201711074U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274675A (en) * | 2010-06-12 | 2011-12-14 | 江苏大明科技有限公司 | Recovery system of tail gas from water treatment agent HEDP production |
| CN102302890A (en) * | 2011-04-29 | 2012-01-04 | 苏州市吴赣药业有限公司 | Hydrogen chloride gas circulating recovery system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110119 Effective date of abandoning: 20130717 |
|
| RGAV | Abandon patent right to avoid regrant |