CN218107665U

CN218107665U - Chloralkali chemical industry chlorate impurity decomposition device

Info

Publication number: CN218107665U
Application number: CN202222103611.1U
Authority: CN
Inventors: 陈锐
Original assignee: Hubei Shanshui Chemical Co ltd
Current assignee: Hubei Shanshui Chemical Co ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-12-23
Anticipated expiration: 2032-08-10

Abstract

The utility model provides a chlor-alkali chemical chlorate impurity decomposition device, including decomposition tank (1), the mixed liquid entry of the top intercommunication inferior sodium tail gas system of decomposition tank (1), its characterized in that still includes blender (2), the mixed liquid entry of exit linkage decomposition tank (1) lower part of blender (2), mixed liquid entry install the check valve, the entry of blender (2) then is connected with respectively and adds the hydrochloric acid source of acid control valve (3) and adds the light salt water source of light salt water governing valve (4), the light salt water source still is equipped with heater (5). The utility model discloses a set up two governing valves and can control the feeding of weak brine and hydrochloric acid to the realization prevents the excessive mixing and reduces decomposition efficiency according to the certain proportion feeding, and establishes the blender before the decomposing tank and can be with two kinds of feeding misce benes, and the reaction is more abundant.

Description

Chloralkali chemical industry chlorate impurity decomposition device

Technical Field

The utility model belongs to the chlor-alkali chemical industry field, concretely relates to chloralkali chemical industry chlorate impurity decomposition device.

Background

In the chlor-alkali chemical industry, direct current is introduced into saturated salt water, materials such as chlorine and light brine are produced on the anode side through an ion exchange membrane, and sodium hydroxide and hydrogen are produced on the cathode side.

During the whole electrolytic reaction process, a series of side reaction substances are formed on the electrolytic anode side, wherein a small amount of sodium hydroxide reversely permeates into the anode chamber due to the migration, permeation and diffusion effects of ions, part of chlorine gas reacts with water to generate hypochlorous acid, the hypochlorous acid reacts with the reversely permeated sodium hydroxide to generate sodium hypochlorite, and the sodium hypochlorite is quickly changed into chlorate (NaClO +2HClO → NaClO) under the acidic condition along with the increase of the sodium hypochlorite ₃ +2HCl)。

When the pH value of the dilute brine is lower than 7, chlorate and hydrochloric acid are decomposed to release chlorine, and equipment is corroded. Meanwhile, the quality of the caustic soda product is directly increased (chlorate in the caustic soda is excessive), and the chlorate can corrode pipelines and equipment of a caustic soda system. When the chlorate content is too high, eventually the crystals in the dilute brine pipes clog the pipes and cause the system to collapse. Therefore, the chlorate impurity removal is particularly important in the chlor-alkali chemical industry.

The existing chlor-alkali chemical industry adopts a traditional decomposition device, light salt water containing chlorate and hydrochloric acid are excessively mixed, and then are decomposed into sodium chloride, chlorine and water by heating (more than 90 ℃). The device has low decomposition efficiency and unstable operation, and the system pipeline has unstable factors such as safety, environmental protection and the like due to high temperature and extremely many leakage points.

SUMMERY OF THE UTILITY MODEL

To the deficiency that prior art exists, the utility model provides a chloralkali chemical industry chlorate impurity decomposition device to chlorate impurity is detached to the high efficiency is stable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a chlorine alkali chemical industry chlorate impurity decomposition device, is including decomposing the jar, and the top of decomposing the jar communicates sodium tail gas system, still includes the blender, the mixed liquid entry of exit linkage decomposing jar lower part of blender, mixed liquid entry are installed the check valve, and the entry of blender then is connected with respectively and takes the light salt water source that adds the hydrochloric acid source of acid regulating valve and add the light salt water regulating valve, the light salt water source still is equipped with the heater.

Further, a polytetrafluoroethylene layer is lined in the decomposition tank.

Further, the heater still is equipped with the steam pipe, the pipeline of steam pipe and light salt water source twines in the heater with the heat transfer, and the pipeline of light salt water source still installs first thermometer in order to detect the light salt water temperature after the heating.

Furthermore, the pipeline of the hydrochloric acid source and the pipeline of the light salt water source are both provided with flow meters.

Furthermore, the side wall of the decomposition tank is also connected with an overflow pipeline with a valve, and the overflow pipeline is connected with a collection tank.

Furthermore, the lower part of the decomposition tank is also connected with an emptying pipeline with a valve, and the emptying pipeline is also connected with a collecting tank.

Further, a second thermometer is also arranged in the decomposition tank.

Further, a stirring pipe is installed at the lower part in the decomposition tank, and an inert gas source is communicated with the stirring pipe and is provided with an opening.

Compared with the prior art, the beneficial effects of the utility model are that: two governing valves can be controlled the feeding of weak brine and hydrochloric acid to realize according to certain proportion feeding, prevent excessive mixing and reduce decomposition efficiency, and establish the blender before the decomposition tank can be with two kinds of feeding misce benes, the reaction is more abundant.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

in the drawings, the reference numbers indicate the following list of parts:

1. decomposing tank, 2, mixer, 3, acid adding regulating valve, 4, dilute brine adding regulating valve, 5, heater, 6, first thermometer, 7, flowmeter, 8, collecting tank, 9, second thermometer, 10 and stirring pipe.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments so that those skilled in the art can more clearly understand the present invention.

As shown in fig. 1, a chloralkali chemical industry chlorate impurity decomposition device, including decomposition tank 1, decomposition tank 1's top intercommunication sodium hypochlorite tail gas system still includes blender 2, and decomposition tank 1's mixed liquid entry is located decomposition tank 1's lower part lateral wall, the mixed liquid entry of exit linkage of blender 2, mixed liquid entry still install the check valve, prevent that the material of decomposition tank 1 from appearing flowing backward, and the entry of blender 2 then is connected with respectively and takes the weak brine source that adds the hydrochloric acid source of acid control valve 3 and add weak brine control valve 4, the weak brine source still is equipped with heater 5.

Wherein, the hydrochloric acid source adopts industrial hydrochloric acid with 31 percent of concentration. The dilute brine obtained after electrolysis is heated to above 90 ℃ by a heater, mixed with hydrochloric acid in a mixer 2 and then decomposed in a decomposition tank, the obtained chlorine enters a sodium hypochlorite tail gas system, and steam condensate water obtained by heat exchange is recovered.

The feeding amount and the feeding ratio of the two materials can be controlled by adjusting two regulating valves, and in the embodiment, the dilute brine and the hydrochloric acid are mixed according to the volume ratio of 1.

The decomposing tank 1 is lined with a polytetrafluoroethylene layer, and the polytetrafluoroethylene is high temperature resistant and acid resistant, can protect the decomposing tank 1 from being corroded by generated chlorine and can bear reaction temperature.

The heater 5 is also provided with a steam pipeline, the steam pipeline and a pipeline of the light brine source are wound in the heater 5 for heat exchange, the light brine is heated to 93 ℃, and the pipeline of the light brine source is also provided with a first thermometer 6 for detecting the temperature of the heated light brine.

Both the pipeline of the hydrochloric acid source and the pipeline of the fresh brine source are provided with flow meters 7 for monitoring the actual flow rates in real time, wherein the flow meters of the pipelines of the fresh brine source are installed at the inlet end of the heater 5.

The lateral wall of decomposition tank 1 still is connected with the overflow pipe who takes the valve, overflow pipe connection has holding vessel 8, and along with hydrochloric acid and the continuous feeding of light salt solution, decomposition tank 1's liquid level constantly risees, through setting up overflow pipe, will be in the upper strata and retrieve in the salt solution overflow to holding vessel 8 that obtains after decomposing promptly to realize the ejection of compact of incessant feeding, continuously handle.

The lower part of the decomposition tank 1 is also connected with an emptying pipeline with a valve, the emptying pipeline is also connected with the collecting tank 8, and when the machine is stopped for maintenance, the valve of the emptying pipeline is opened to safely empty materials in the collecting tank.

The decomposition tank 1 is further provided with a second thermometer 9 for detecting the reaction temperature in the decomposition tank 1 and adjusting the heater 5 so that the reaction temperature is within the index range.

Stirring pipe 10 is installed to the lower part in the decomposition tank 1, stirring pipe 10 leads to inert gas source and establishes the trompil, and when opening decomposition reaction and going on, open inert gas source's valve, make inert gas emerge from the trompil, the trompil is equipped with a plurality ofly to promote the bubbling rate, realize gas promptly and erode the stirring, accelerate the decomposition.

In this embodiment, the inert gas source is specifically nitrogen, and the stirring pipe is made of titanium, so as to improve the high temperature resistance and corrosion resistance.

The mechanisms, components and parts of the present invention not described with respect to the specific structure are the existing structures that exist in the prior art. Can be purchased directly from the market.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a chlor-alkali chemical chlorate impurity decomposition device, is including decomposition tank (1), and the top of decomposition tank (1) communicates sodium hypochlorite tail gas system, its characterized in that still includes blender (2), the mixed liquid entry of exit linkage decomposition tank (1) lower part of blender (2), mixed liquid entry install the check valve, the entry of blender (2) then is connected with respectively and adds the hydrochloric acid source of acid control valve (3) and adds the light salt water source of light salt water governing valve (4), the light salt water source still is equipped with heater (5).

2. The chlorate salt impurity decomposing device according to claim 1, wherein the decomposing tank (1) is lined with a layer of polytetrafluoroethylene.

3. The chlor-alkali chemical chlorate impurity decomposition plant according to claim 1, wherein said heater (5) is further provided with a steam pipe wound inside said heater (5) for heat exchange with a pipe of the weak brine source and wherein said pipe of the weak brine source is further equipped with a first thermometer (6) for detecting the temperature of the heated weak brine.

4. The chlorate impurity decomposing device according to claim 1, wherein the pipes for the hydrochloric acid source and the pipes for the fresh salt water source are provided with flow meters (7).

5. The chlorate salt impurity decomposing device according to claim 1, wherein a valved overflow conduit is further connected to the side wall of the decomposing tank (1) and a collection tank (8) is connected to the overflow conduit.

6. The chlorate impurity decomposing device according to claim 5, wherein a drain pipe with a valve is further connected to the lower part of the decomposing tank (1), and the drain pipe is also connected to the collecting tank (8).

7. The chlorate impurity decomposing device according to claim 1, wherein a second thermometer (9) is further arranged in the decomposing tank (1).

8. The chlorate impurity decomposing device in the chlor-alkali chemical industry as defined in claim 1, wherein said decomposing tank (1) is provided with a stirring pipe (10) at the lower part thereof, said stirring pipe (10) being supplied with an inert gas source and being provided with openings.