CN215251227U - Chlorate decomposition device in production of caustic soda by ion-exchange membrane method - Google Patents
Chlorate decomposition device in production of caustic soda by ion-exchange membrane method Download PDFInfo
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- CN215251227U CN215251227U CN202121196699.5U CN202121196699U CN215251227U CN 215251227 U CN215251227 U CN 215251227U CN 202121196699 U CN202121196699 U CN 202121196699U CN 215251227 U CN215251227 U CN 215251227U
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Abstract
The utility model discloses a chlorate decomposer in the production of caustic soda by an ionic membrane method, which comprises a first-stage decomposer and a second-stage decomposer, wherein the liquid outlet of the first-stage decomposer is connected with the liquid inlet of the second-stage decomposer by a liquid pipeline, a pump is arranged on the liquid pipeline, and the liquid outlet of the second-stage decomposer is connected to a dechlorination tower by a pipeline; a liquid inlet is formed in the top of the first-stage decomposition tank and connected with a mixer, a light salt water pipeline and a hydrochloric acid pipeline are connected to a feed inlet of the mixer, and a stirring device is arranged in the second-stage decomposition tank; the top of the secondary decomposer is provided with a hydrochloric acid inlet, and chlorine outlets of the primary decomposer and the secondary decomposer are respectively connected with a chlorine absorption tower through pipelines; the utility model discloses a one-level decomposer and second grade decomposer cooperate, realize decomposing the chlorate substep of enrichment in the light salt solution, have solved the limited problem of chlorate decomposer decomposition flow.
Description
Technical Field
The utility model relates to a chlorate decomposition device, concretely relates to chlorate decomposition device in ionic membrane method caustic soda production.
Background
At present, the domestic caustic soda is mainly produced by an ion membrane method, a series of side reactions can occur in a caustic soda electrolytic cell during electrolysis due to the dissolution of an anode product, the migration and diffusion of a cathode product and the anode product during electrification and the like, chlorine in an anode chamber reacts with hydroxide radical from the reverse osmosis of the cathode to generate hypochlorite, and the hypochlorite loses electrons under an acidic condition to generate the chlorate. The long-period operation of the production of the caustic soda by the ion-exchange membrane method is not intermittent, the brine in the caustic soda production can generate chlorate in the whole system, the chlorate can be accumulated in the system by closed cycle in the production, the increase of the content can cause the current efficiency to be reduced, the equipment is corroded, and the chelating resin is damaged.
The prior method for reducing chlorate mainly comprises the following steps of mixing a dilute salt water hydrochloric acid solution generated by an ion membrane electrolytic cell, and then feeding the mixed solution into a chlorate decomposer to decompose chlorate, wherein the chemical reaction equation is as follows: NaClO3+6HCl=3Cl2+NaCl+3H2And O, chlorine generated by the reaction is merged into an electrolytic chlorine manifold. However, when the ionic membrane is operated to the later stage, chlorate generated by side reaction of the electrolytic cell is increased, but the decomposition flow of the chlorate decomposer is limited and cannot be increased any more, and chlorate has strong oxidizing property, and the prior chlorate decomposer adopts electric heating and other modes, so that potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a chlorate decomposition device in ionic membrane method caustic soda production to improve the decomposition efficiency of chlorate.
In order to achieve the above purpose, the present invention is achieved by the following technical solutions.
A chlorate decomposer in the production of caustic soda by an ionic membrane method comprises a primary decomposer and a secondary decomposer, wherein a liquid outlet of the primary decomposer is connected with a liquid inlet of the secondary decomposer through a liquid pipeline, a pump is arranged on the liquid pipeline, and a liquid outlet of the secondary decomposer is connected to a dechlorination tower through a pipeline; a liquid inlet is formed in the top of the primary decomposing tank and connected with a mixer, a light salt water pipeline and a hydrochloric acid pipeline are connected to a feed inlet of the mixer, and a first chlorine outlet is formed in the top of the primary decomposing tank; a stirring device is arranged in the secondary decomposition tank; the top of the second-stage decomposition tank is provided with a hydrochloric acid inlet, the hydrochloric acid inlet is connected with a hydrochloric acid storage tank through a pipeline, the top of the second-stage decomposition tank is provided with a second chlorine outlet, and the first chlorine outlet and the second chlorine outlet are connected with a chlorine absorption tower through pipelines.
Furthermore, a steam coil pipe is arranged in the first-stage decomposition tank, steam pipes are arranged on the periphery of the stirring device in the second-stage decomposition tank, and a plurality of air holes are distributed on the steam coil pipe and the steam pipes.
Furthermore, the steam coil and the steam pipe are respectively connected with a steam generating device.
Furthermore, the hydrochloric acid pipeline is connected with a hydrochloric acid storage tank.
Furthermore, a liquid outlet pipeline of the first-stage decomposition tank and a liquid outlet pipeline of the second-stage decomposition tank are both provided with regulating pumps.
The utility model discloses produced beneficial effect for prior art does:
the utility model discloses a first-order decomposer and second grade decomposer cooperate, realize decomposing the chlorate of enrichment in the weak brine step by step, will wait that the weak brine of processing enters first-order decomposer earlier, when decomposing midway, arrange into the second grade decomposer and carry out further decomposition, later usable first-order decomposer further handles subsequent weak brine, realize continuous processing to the weak brine of discharging, improved the efficiency of decomposing chlorate, solved the limited problem of chlorate decomposer decomposition flow; steam is used as heat required by the reaction, chlorate is decomposed in the environment of heat supply coexistence of hydrochloric acid and steam to generate chlorine and sodium chloride, and the heating mode is safer on the premise of ensuring the treatment process.
Drawings
Fig. 1 is a schematic structural view of the chlorate decomposing device of the present invention.
In the figure, 1 is a first-stage decomposer; 2 is a secondary decomposer; 3 is a liquid outlet; 4 is a liquid pipeline; 5 is a pump, 6 is a dechlorination tower, 7 is a mixer, 8 is a light salt water pipeline, 9 is a hydrochloric acid pipeline, 10 is a first chlorine outlet, 11 is a stirring device, 12 is a hydrochloric acid inlet, 13 is a hydrochloric acid storage tank, 14 is a second chlorine outlet, 15 is a chlorine absorption tower, 16 is a steam coil, 17 is a steam pipe, 18 is a steam generating device, and 19 is a regulating valve.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 1, the chlorate decomposing device in the production of caustic soda by an ion membrane method comprises a primary decomposing tank 1 and a secondary decomposing tank 2, wherein a liquid outlet 3 of the primary decomposing tank 1 is connected with a liquid inlet of the secondary decomposing tank 2 through a liquid pipeline 4, and the liquid pipeline 4 is provided with a pump 5 and a regulating valve 19; a liquid outlet 3 of the secondary decomposition tank 2 is connected to a dechlorination tower 6 through a pipeline; the liquid outlet line of the secondary decomposition tank 2 is also provided with a regulating pump 19.
The top of the first-stage decomposition tank 1 is provided with a liquid inlet, the liquid inlet is connected with a mixer 7, a feed inlet of the mixer 7 is connected with a light salt water pipeline 8 and a hydrochloric acid pipeline 9, and the hydrochloric acid pipeline 9 is connected with a hydrochloric acid storage tank 13. The top of the primary decomposer 1 is provided with a first chlorine outlet 10; a stirring device 11 is arranged in the secondary decomposition tank 2, and the stirring device 11 is driven by a motor; the top of the secondary decomposing tank 2 is provided with a hydrochloric acid inlet 12, the hydrochloric acid inlet 12 is connected with a hydrochloric acid storage tank 13 through a pipeline, the top of the secondary decomposing tank 2 is provided with a second chlorine outlet 14, and the first chlorine outlet 10 and the second chlorine outlet 14 are connected with a chlorine absorption tower 15 through pipelines. Vacuum dechlorination and chemical dechlorination are carried out in the chlorine absorption tower 15, and then the chlorine absorption tower is sent to a primary brine working section for salt re-melting and recycling.
A steam coil 16 is arranged in the first-stage decomposition tank 1, a plurality of communicated steam pipes 17 are arranged at the periphery of the stirring device 11 in the second-stage decomposition tank 2, and a plurality of air holes are distributed on the steam coil 16 and the steam pipes 17. The steam coil 16 and the steam pipe 17 are connected to a steam generating device 18, respectively.
The specific working process is as follows: the dilute brine from the electrolytic tank and the hydrochloric acid are mixed in the mixer 7 and then enter the primary decomposition tank 1 to react, the chlorate and the hydrochloric acid react, the treatment and the liquid in the decomposition tank 1 are sent into the secondary decomposition tank 2 to be continuously treated through the pump 5 in the process of completely decomposing a half, meanwhile, the subsequent dilute brine to be treated is pumped into the primary decomposition tank 1 to be treated, the treatment process is heated through steam, the stirring device 11 is additionally arranged in the secondary decomposition tank 2, and the decomposition efficiency is improved.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (5)
1. The chlorate decomposition device in the production of caustic soda by an ionic membrane method is characterized by comprising a primary decomposition tank (1) and a secondary decomposition tank (2), wherein a liquid outlet (3) of the primary decomposition tank (1) is connected with a liquid inlet of the secondary decomposition tank (2) through a liquid pipeline (4), a pump (5) is arranged on the liquid pipeline (4), and the liquid outlet (3) of the secondary decomposition tank (2) is connected to a dechlorination tower (6) through a pipeline; a liquid inlet is formed in the top of the primary decomposing tank (1), the liquid inlet is connected with a mixer (7), a liquid inlet of the mixer (7) is connected with a light salt water pipeline (8) and a hydrochloric acid pipeline (9), and a first chlorine outlet (10) is formed in the top of the primary decomposing tank (1); a stirring device (11) is arranged in the secondary decomposing tank (2); the top of the secondary decomposition tank (2) is provided with a hydrochloric acid inlet (12), the hydrochloric acid inlet (12) is connected with a hydrochloric acid storage tank (13) through a pipeline, the top of the secondary decomposition tank (2) is provided with a second chlorine outlet (14), and the first chlorine outlet (10) and the second chlorine outlet (14) are connected with a chlorine absorption tower (15) through pipelines.
2. The chlorate decomposer in the production of caustic soda by an ion membrane method according to claim 1, wherein a steam coil (16) is arranged in the primary decomposer (1), a steam pipe (17) is arranged in the secondary decomposer (2) and positioned at the periphery of the stirring device (11), and a plurality of air holes are distributed on the steam coil (16) and the steam pipe (17).
3. The chlorate decomposer in the production of caustic soda by an ion-membrane method according to claim 2, wherein the steam coil (16) and the steam pipe (17) are respectively connected with a steam generator (18).
4. The chlorate decomposer according to claim 1, wherein the hydrochloric acid line (9) is connected to a hydrochloric acid storage tank (13).
5. The chlorate decomposer in the production of caustic soda by an ion membrane method according to claim 1, wherein a regulating pump (19) is arranged on the liquid outlet pipeline of the primary decomposer (1) and the liquid outlet pipeline of the secondary decomposer (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121196699.5U CN215251227U (en) | 2021-05-31 | 2021-05-31 | Chlorate decomposition device in production of caustic soda by ion-exchange membrane method |
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| CN202121196699.5U CN215251227U (en) | 2021-05-31 | 2021-05-31 | Chlorate decomposition device in production of caustic soda by ion-exchange membrane method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114011373A (en) * | 2022-01-05 | 2022-02-08 | 东营市赫邦化工有限公司 | Chlorate decomposer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114011373A (en) * | 2022-01-05 | 2022-02-08 | 东营市赫邦化工有限公司 | Chlorate decomposer |
| CN114011373B (en) * | 2022-01-05 | 2022-05-20 | 东营市赫邦化工有限公司 | Chlorate decomposer |
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