阅读说明：本技术 一种用于副产盐资源化利用的装置及工艺系统 (Device and process system for resource utilization of byproduct salt ) 是由 徐文新 朱俊 唐建军 杨国华 马培岚 唐宏 陈松 侯小飞 文欢 于 2020-07-27 设计创作，主要内容包括：本发明公开了一种用于副产盐资源化利用的装置及工艺系统,包括依次连接的膜式过滤器、饱和盐水槽和复合膜电解槽,饱和盐水槽与复合膜电解槽之间设置有饱和盐水输送管路和饱和盐水输送泵,复合膜电解槽包括若干数量的电解槽单元,每一电解槽单元包括阳极室和阴极室,阳极室和阴极室之间设置有隔膜,隔膜为含氟材料纤维复合膜；阴极室上分别设置有阴极气体排放软管和阴极出液软管,阴极气体排放软管分别连接氢气总管,阴极出液软管连接单片阴极出液管,各电解槽单元中的单片阴极出液管连接阴极液总管,且单片阴极出液管通过单片阴极液位调节器实现出液口高度的调节。本发明实现了副产盐的规模化和高效化利用。(The invention discloses a device and a process system for resource utilization of byproduct salt, which comprise a membrane filter, a saturated brine tank and a composite membrane electrolytic cell which are sequentially connected, wherein a saturated brine conveying pipeline and a saturated brine conveying pump are arranged between the saturated brine tank and the composite membrane electrolytic cell; cathode gas discharge hoses and cathode liquid outlet hoses are respectively arranged on the cathode chambers, the cathode gas discharge hoses are respectively connected with the hydrogen main pipe, the cathode liquid outlet hoses are connected with single-piece cathode liquid outlet pipes, the single-piece cathode liquid outlet pipes in each electrolytic cell unit are connected with the cathode liquid main pipe, and the single-piece cathode liquid outlet pipes realize the adjustment of the height of the liquid outlet through a single-piece cathode liquid level adjuster. The invention realizes the scale and high-efficiency utilization of the byproduct salt.)

1. The device for resource utilization of the byproduct salt is characterized by comprising a membrane filter, a saturated salt water tank and a composite membrane electrolytic cell which are sequentially connected according to a flow for treating the saturated salt water of the byproduct salt, wherein a saturated salt water conveying pipeline is arranged between the saturated salt water tank and the composite membrane electrolytic cell, a saturated salt water conveying pump is arranged on the saturated salt water conveying pipeline, the composite membrane electrolytic cell comprises a plurality of electrolytic cell units, each electrolytic cell unit comprises an anode chamber and a cathode chamber, a diaphragm is arranged between the anode chamber and the cathode chamber, and the diaphragm is a fluorine-containing material fiber composite membrane; be provided with cathode gas emission hose and cathode liquid outlet hose on the cathode chamber respectively, in each electrolysis trough unit the cathode gas emission hose is connected hydrogen house steward respectively, in cathode liquid outlet hose connection monolithic cathode drain pipe, each electrolysis trough unit monolithic cathode drain pipe connects cathode liquid house steward, just monolithic cathode drain pipe realizes the regulation of liquid outlet height through monolithic cathode level controller.

2. The apparatus of claim 1, wherein the single cathode effluent pipes of each electrolyzer unit are further connected to a waste liquid header pipe through a stop valve.

3. The apparatus as claimed in claim 1, wherein the anode chamber and the cathode chamber are sealed by rubber gasket and rigid flange, and the anode in each electrolytic cell unit and the cathode in each electrolytic cell unit are connected in series by conductive device.

4. The apparatus according to claim 1, wherein the anode chamber is provided with an anode liquid inlet hose and an anode liquid outlet hose, the anode liquid inlet hose of each cell unit is connected to an anode liquid inlet header pipe, the anode liquid outlet hose of each cell unit is connected to an anode header pipe as an anode elevated tank, and a single-plate gas-liquid separator is disposed between the anode liquid outlet hose and the anode header pipe.

5. The apparatus of claim 1, wherein a brine heat exchanger is disposed on the saturated brine conveying pipeline, and the brine heat exchanger is connected to the low-pressure steam pipeline.

6. The apparatus according to claim 1, wherein the fluorine-containing material fiber composite membrane is prepared by a method comprising:

(1) preparing slurry: adding a certain proportion of fluorine-containing material fiber and a mineral powder filling material into an aqueous solution containing sodium chloride and sodium hydroxide, fully stirring and mixing, adding a certain proportion of PTFE emulsion to enable the fluorine-containing material fiber to obtain hydrophilicity, and then stirring and mixing the mixed solution at a high speed through a reaction kettle at a set mixing temperature to enable the fluorine-containing material fiber to form a net-shaped structure in the mixed solution, so that the mineral powder filling material and the aqueous solution of the sodium chloride and the sodium hydroxide are uniformly filled in the net-shaped space of the net-shaped structure, and thus uniformly dispersed slurry is formed;

(2) slurry adsorption: enabling the cathode of the electrolytic cell to be horizontally contacted with the adsorption slurry or be immersed into the adsorption slurry to enable the uniformly dispersed slurry to be adsorbed on the cathode of the electrolytic cell, so that a layer of wet film is formed on the surface of the cathode of the electrolytic cell;

(3) drying the wet film: drying a layer of wet film on the surface of the cathode of the electrolytic cell at a set drying temperature to form a dry film, and drying sodium chloride in the wet film to form crystals which are uniformly mixed in a mineral powder filling material of the dry film;

(4) sintering to obtain the fluorine-containing material fiber composite membrane: the wet film is sintered at a set sintering temperature after being dried, so that the fluorine-containing material fibers in the dry film are firmly bonded together to form a net-shaped bonding structure; forming micropores between the mineral powder filling material particles and the fluorine-containing material fibers through dry film sintering, wherein the micropores are used as first micropore channels of brine on the fluorine-containing material fiber composite membrane during electrolysis, and sodium chloride crystals are dissolved during electrolysis to form second micropore channels of the brine on the fluorine-containing material fiber composite membrane;

wherein the fluorine-containing material is a fluoropolymer and the fluorine-containing material fibers are fluoropolymer fibers.

7. The device for resource utilization of byproduct salt according to claim 6, wherein the preparation of the fluorine-containing material fiber composite membrane comprises the following process steps:

s1, precursor preparation: dissolving sodium chloride and sodium hydroxide in pure water to form a mixed solution of 13-15% of sodium chloride and 13-15% of sodium hydroxide in mass ratio, and mixing the fluorine-containing material fiber, the mineral powder filling material and the pure water in a mass ratio of 1: (2-9): (40-160) adding the mixture into a sodium chloride/sodium hydroxide solution, stirring and mixing the mixture in a reaction kettle at a high speed of 900-5400 r/min, and uniformly dispersing the fluorine-containing material fibers at the system temperature of 30-45 ℃;

s2, preparing slurry: under the high-speed stirring state, according to the mass ratio of 4: 1 adding PTFE emulsion, continuously stirring at a high speed, and maintaining the temperature of the system at 30-45 ℃ to ensure that the materials are uniform to form slurry;

s3, film adsorption molding: forming a composite membrane on the cathode of the electrolytic bath by horizontally or submersedly adsorbing the slurry;

s4, drying: the drying temperature is 80-130 ℃;

s5, sintering, wherein the sintering temperature is as follows: 120 to 345 ℃.

Wherein the fluorine-containing material is a fluoropolymer and the fluorine-containing material fibers are fluoropolymer fibers;

wherein the mineral powder filler is one of titanium dioxide powder, zirconium dioxide powder and hydrous magnesium silicate;

wherein the diameter of the fluorine-containing material fiber is 2-3 μm, and the length is 4-10 mm; during drying, the drying is carried out according to a method of gradually increasing the temperature according to a program of 80-100-120 ℃; and sintering according to a method of gradually increasing the temperature according to the program of 120-170-220-270-320-330-340-345 ℃ during sintering, and sintering for 2-3 hours at 330-345 ℃.

8. The technical system for resource utilization of the byproduct salt is characterized by comprising a membrane filter, a saturated salt water tank, a composite membrane electrolytic cell and an electrolytic product utilization unit which are sequentially arranged according to a technical process of treating saturated salt water of the byproduct salt, wherein the electrolytic product utilization unit comprises a chlorine utilization unit and a caustic soda utilization unit, alkali liquor generated by the composite membrane electrolytic cell is subjected to system outage treatment and then is conveyed to the caustic soda utilization unit through a conveying system, and chlorine generated by the composite membrane electrolytic cell is conveyed to the chlorine utilization unit through a gas suction pressurization device.

9. The process system for resource utilization of byproduct salt, according to claim 8, wherein a chlorine gas delivery line is connected between the composite membrane electrolytic cell and the chlorine gas utilization unit, a caustic soda delivery line is connected between the composite membrane electrolytic cell and the caustic soda utilization unit, and a cooling circulation loop is connected between the chlorine gas delivery line and the caustic soda delivery line, the cooling circulation loop exchanges heat with the chlorine gas delivery line through a chlorine gas cooler, and the cooling circulation loop exchanges heat with the caustic soda delivery line through a caustic soda cooler.

10. The process system for resource utilization of byproduct salt according to claim 8, wherein the product of caustic soda and chlorine gas is continuously used in the electrolytic product utilization unit to regenerate byproduct salt.

Technical Field

The invention relates to the technical field of resource utilization of byproduct salt, in particular to a device and a process system for resource utilization of byproduct salt.

Background

In chemical industries, particularly petrochemical, coal chemical, fine chemical, intermediate and the like, a large amount of waste sodium chloride and other byproduct salts are generated every year. Because the byproduct salt contains various impurities, the byproduct salt cannot enter a production system with high requirements on raw materials to become waste salt, and the byproduct salt becomes a bottleneck problem of sustainable development of the industry and is also a key problem of high attention of the society, the public and government departments.

The existing byproduct salt waste salt is generally treated in a centralized discharge mode. The treatment mode of the byproduct salt waste salt can cause certain harm to the environment and waste salt resources. If the waste salt is recycled, the harm to the environment is reduced firstly, and meanwhile, the waste salt is electrolyzed to generate basic chemical raw materials, so that the output value and the profit of a company are increased. Therefore, it is necessary to develop a technology for recycling waste salt as a byproduct salt.

Disclosure of Invention

In order to solve the problems, the invention provides a device and a process system for resource utilization of byproduct salt, and aims to realize large-scale and efficient resource utilization of the byproduct salt. The specific technical scheme is as follows:

a device for resource utilization of byproduct salt comprises a membrane filter, a saturated salt water tank and a composite membrane electrolytic cell which are sequentially connected according to a flow for treating saturated salt water of the byproduct salt, wherein a saturated salt water conveying pipeline is arranged between the saturated salt water tank and the composite membrane electrolytic cell, a saturated salt water conveying pump is arranged on the saturated salt water conveying pipeline, the composite membrane electrolytic cell comprises a plurality of electrolytic cell units, each electrolytic cell unit comprises an anode chamber and a cathode chamber, a diaphragm is arranged between the anode chamber and the cathode chamber, and the diaphragm is a fluorine-containing material fiber composite membrane; be provided with cathode gas emission hose and cathode liquid outlet hose on the cathode chamber respectively, in each electrolysis trough unit the cathode gas emission hose is connected hydrogen house steward respectively, in cathode liquid outlet hose connection monolithic cathode drain pipe, each electrolysis trough unit monolithic cathode drain pipe connects cathode liquid house steward, just monolithic cathode drain pipe realizes the regulation of liquid outlet height through monolithic cathode level controller.

Wherein, the single-chip cathode liquid outlet pipe in each electrolytic cell unit is also connected with a waste liquid main pipe through a stop valve respectively.

In the invention, the connection periphery of the anode chamber and the cathode chamber is sealed by a rubber gasket and a rigid flange, and the anode in each electrolytic cell unit and the cathode in each electrolytic cell unit are respectively connected in series by a conductive device.

In the invention, an anode liquid inlet hose and an anode liquid outlet hose are respectively arranged on the anode chamber, the anode liquid inlet hose in each electrolytic cell unit is respectively connected with an anode liquid inlet main pipe, the anode liquid outlet hose in each electrolytic cell unit is respectively connected with an anode main pipe serving as an anode elevated tank, and a single-piece gas-liquid separator is arranged between the anode liquid outlet hose and the anode main pipe.

Preferably, a brine heat exchanger is arranged on the saturated brine conveying pipeline and connected with a low-pressure steam pipeline.

In the invention, the fluorine-containing material fiber composite membrane is prepared by the following method:

(1) preparing slurry: adding a certain proportion of fluorine-containing material fiber and a mineral powder filling material into an aqueous solution containing sodium chloride and sodium hydroxide, fully stirring and mixing, adding a certain proportion of PTFE emulsion to enable the fluorine-containing material fiber to obtain hydrophilicity, and then stirring and mixing the mixed solution at a high speed through a reaction kettle at a set mixing temperature to enable the fluorine-containing material fiber to form a net-shaped structure in the mixed solution, so that the mineral powder filling material and the aqueous solution of the sodium chloride and the sodium hydroxide are uniformly filled in the net-shaped space of the net-shaped structure, and thus uniformly dispersed slurry is formed;

(2) slurry adsorption: enabling the cathode of the electrolytic cell to be horizontally contacted with the adsorption slurry or be immersed into the adsorption slurry to enable the uniformly dispersed slurry to be adsorbed on the cathode of the electrolytic cell, so that a layer of wet film is formed on the surface of the cathode of the electrolytic cell;

(3) drying the wet film: drying a layer of wet film on the surface of the cathode of the electrolytic cell at a set drying temperature to form a dry film, and drying sodium chloride in the wet film to form crystals which are uniformly mixed in a mineral powder filling material of the dry film;

(4) sintering to obtain the fluorine-containing material fiber composite membrane: the wet film is sintered at a set sintering temperature after being dried, so that the fluorine-containing material fibers in the dry film are firmly bonded together to form a net-shaped bonding structure; and forming micropores between the mineral powder filling material particles and the fluorine-containing material fibers by dry film sintering, wherein the micropores are used as first micropore channels of brine on the fluorine-containing material fiber composite membrane during electrolysis, and sodium chloride crystals are dissolved during electrolysis to form second micropore channels of the brine on the fluorine-containing material fiber composite membrane.

Wherein the fluorine-containing material is a fluoropolymer and the fluorine-containing material fibers are fluoropolymer fibers.

Preferably, the fluoropolymer is one of polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene-propylene copolymer, perfluoroalkoxy resin, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer, polyvinylidene fluoride and polyvinyl fluoride.

Preferably, the mineral powder filler is one of titanium dioxide powder, zirconium dioxide powder and hydrous magnesium silicate.

In the invention, the preparation of the fluorine-containing material fiber composite membrane comprises the following process steps:

s1, precursor preparation: dissolving sodium chloride and sodium hydroxide in pure water to form a mixed solution of 13-15% of sodium chloride and 13-15% of sodium hydroxide in mass ratio, and mixing the fluorine-containing material fiber, the mineral powder filling material and the pure water in a mass ratio of 1: (2-9): (40-160) adding the mixture into a sodium chloride/sodium hydroxide solution, stirring and mixing the mixture in a reaction kettle at a high speed of 900-5400 r/min, and uniformly dispersing the fluorine-containing material fibers at the system temperature of 30-45 ℃;

s2, preparing slurry: under the high-speed stirring state, according to the mass ratio of 4: 1 adding PTFE emulsion, continuously stirring at a high speed, and maintaining the temperature of the system at 30-45 ℃ to ensure that the materials are uniform to form slurry;

s3, film adsorption molding: forming a composite membrane on the cathode of the electrolytic bath by horizontally or submersedly adsorbing the slurry;

s4, drying: the drying temperature is 80-130 ℃;

s5, sintering, wherein the sintering temperature is as follows: 120-345 ℃;

wherein the fluorine-containing material is a fluoropolymer and the fluorine-containing material fibers are fluoropolymer fibers;

preferably, the fluoropolymer is one of polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene-propylene copolymer, perfluoroalkoxy resin, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer, polyvinylidene fluoride and polyvinyl fluoride.

Wherein the mineral powder filler is one of titanium dioxide powder, zirconium dioxide powder and hydrous magnesium silicate;

wherein the diameter of the fluorine-containing material fiber is 2-3 μm, and the length is 4-10 mm; during drying, the drying is carried out according to a method of gradually increasing the temperature according to a program of 80-100-120 ℃; and sintering according to a step-by-step temperature raising method with the program of 120-170-220-270-320-330-340-345 ℃ during sintering, and sintering for 2-3 hours at the temperature of 330-345 ℃.

The film forming mechanism of the fluorine-containing material fiber composite film is as follows: in the slurry system, the PTFE emulsion imparts hydrophilicity to the fluorine-containing material fibers, and can be uniformly dispersed in the slurry system. In the composite membrane formed by vacuum adsorption, fluorine-containing material fibers are criss-cross to form a grid, and mineral powder filling materials are filled in the grid, wherein micropores are formed between the mineral powder filling materials and the fluorine-containing material fibers and between the mineral powder filling materials and particles of the mineral powder filling materials; in addition, in the drying process, sodium chloride in the slurry is crystallized and then clamped in the mineral powder filling material, and micropores can be formed after the sodium chloride crystals are dissolved during driving, so that the sodium chloride crystals become a passage of the brine on the composite membrane; after sintering, the fluorine-containing material fiber can be firmly bonded together to form a net structure, so that the mechanical property of the composite membrane is enhanced, and the fluorine-containing material fiber composite membrane has longer service life. During electrolysis, brine forms Cl in the anode compartment₂，Cl₂Overflowing through the gas channel, the liquid enters into the cathode chamber through the micropores under the drive of a certain liquid level difference, and NaOH and H are formed in the cathode chamber₂。

A process system for resource utilization of byproduct salt comprises a membrane filter, a saturated salt water tank, a composite membrane electrolytic cell and an electrolytic product utilization unit which are sequentially arranged according to a process flow for treating saturated salt water of the byproduct salt, wherein the electrolytic product utilization unit comprises a chlorine utilization unit and a caustic soda utilization unit, alkali liquor generated by the composite membrane electrolytic cell is subjected to system power-off treatment and then is conveyed to the caustic soda utilization unit through a conveying system, and chlorine generated by the composite membrane electrolytic cell is conveyed to the chlorine utilization unit through a gas suction pressurization device.

The chlorine gas circulation system comprises a chlorine gas utilization unit, a composite membrane electrolytic cell, a chlorine gas conveying pipeline, a caustic soda conveying pipeline, a cooling circulation loop and a cooling circulation loop, wherein the chlorine gas conveying pipeline is connected between the composite membrane electrolytic cell and the chlorine gas utilization unit, the caustic soda conveying pipeline is connected between the composite membrane electrolytic cell and the caustic soda utilization unit, the cooling circulation loop is connected with the chlorine gas conveying pipeline through a chlorine gas cooler for heat exchange, and the cooling circulation loop is connected with the caustic soda conveying pipeline through a caustic soda cooler for heat exchange.

Preferably, the product of caustic soda and chlorine gas is continuously used in the electrolytic product utilization unit to regenerate a salt by-produced.

The method can be used for resource utilization of chemical byproduct salt, and can convert sodium chloride with high organic content into sodium hydroxide for resource utilization.

In the invention, the cathode does not need to consume materials except the saline water added to the anode in the running process of the composite membrane electrolytic cell. The fluorine-containing material fiber composite membrane on the unit electrolytic tank has an acceptance range of less than 200ppm for the content of organic matters in the byproduct salt, and the service life is more than 5 years.

The resource utilization device for the byproduct salt is formed by connecting a plurality of unit electrolytic cells in series, the effective area of a single chip is 0.5-3.3 square meters, 1-200 unit electrolytic cells can be configured according to actual needs by a single device, the operating current density is 0-2 KA/square meter, the concentration of generated sodium hydroxide is 0-16%, the purity of chlorine is more than 98%, the purity of hydrogen is more than 99%, the current efficiency is more than 0.95%, the device is flexibly configured, and the annual treatment byproduct salt amount can reach ten thousand tons and more.

The process flow of the byproduct salt treatment of the invention is as follows:

(1) the saturated brine of the byproduct salt is filtered by the membrane filter to form the saturated brine with the following properties: NaCl concentration 300-315 g/l, Ca²⁺And Mg²⁺Concentration less than or equal to 10mg/l, SO4^2-Concentration, NaClO₃The concentration, the suspended matter concentration, the TOC concentration less than or equal to 200mg/l, the PH value of 9-10, the temperature more than or equal to 50 ℃ and 0.2 MpaG.

(2) The method comprises the steps that saturated brine of byproduct salt enters a saturated brine tank after being filtered by a membrane filter, then enters a brine heat exchanger for heat exchange through a brine delivery pump, is heated to 65-80 ℃, enters an anode elevated tank of a composite membrane electrolytic cell, the byproduct brine enters the composite membrane electrolytic cell under the action of gravity, a cathode chamber and an anode chamber in the composite membrane electrolytic cell are separated by a fluorine-containing material fiber composite membrane, under the action of the fluorine-containing material fiber composite membrane and current, chloride ions and sodium ions in the anode chamber are separated, the chloride ions are changed into chlorine, sodium ions and partial sodium chloride solution penetrate through the composite membrane and enter the cathode chamber, the sodium ions and hydroxide ions decomposed by water are combined to form sodium hydroxide in the cathode chamber, and the hydrogen ions are changed into hydrogen.

(3) Chlorine gas and chlorine gas are sent to the chlorine gas utilization unit through a gas suction pressurizing device, and sodium hydroxide (caustic soda) is sent to a caustic soda utilization unit.

(4) And after the chlorine utilization unit and the caustic soda and the chlorine are used, the byproduct salt is regenerated to form the cyclic utilization of the byproduct salt resource.

The invention has the beneficial effects that:

first, according to the apparatus and process system for resource utilization of byproduct salt of the present invention, the diaphragm between the cathode chamber and the anode chamber of the composite membrane electrolytic cell of the apparatus for resource utilization of byproduct salt is a fluorine-containing material fiber composite membrane, which has good adaptability to byproduct salt, high electrolysis efficiency, and long service life.

Secondly, according to the device and the process system for resource utilization of byproduct salt, the height of the single-chip cathode liquid outlet pipe of the electrolytic cell unit can be freely adjusted, so that the concentration of the generated sodium hydroxide can be ensured to be within a control index range.

Thirdly, according to the device and the process system for resource utilization of the byproduct salt, enough electrolytic bath units can be arranged in one set of device according to the treatment capacity of the byproduct salt, so that the large-scale and efficient resource utilization of the byproduct salt is realized.

Fourthly, the device and the process system for resource utilization of the byproduct salt are made of titanium, nickel and stainless steel materials, and the service life of the device is over 10 years.

Fifthly, the device and the process system for resource utilization of byproduct salt adopt a rapid circulation structure, and are beneficial to escape of bubbles generated by decomposition of organic matters in the electrolytic chamber, so that the electrolytic efficiency is improved, and the electrolytic energy consumption is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus and a process system for resource utilization of byproduct salt according to the present invention;

FIG. 2 is a schematic diagram of the structure of the composite membrane electrolyzer of FIG. 1;

FIG. 3 is a schematic flow chart of a process for preparing a fluorine-containing material fiber composite membrane;

FIG. 4 is a graph showing the tendency of the use of the fluorine-containing material fiber composite membrane for the electrolytic refining of brine and the electrolytic by-production of brine; the bottom coordinate in the figure represents time (hours), the left ordinate represents voltage V (corresponding to curve (r)), and the right ordinate represents temperature or alkali concentration (wherein, the right ordinate of corresponding curve (r) represents temperature, and the right ordinate of corresponding curve (r) represents alkali concentration%).

In the figure: 1. the device comprises a membrane filter, 2, a saturated brine tank, 3, a composite membrane electrolytic cell, 4, a saturated brine conveying pipeline, 5, a brine conveying pump, 6, a cathode gas discharge hose, 7, a cathode liquid outlet hose, 8, a hydrogen main pipe, 9, a single-piece cathode liquid outlet pipe, 10, a cathode liquid main pipe, 11, a single-piece cathode liquid level regulator, 12, a stop valve, 13, a waste liquid main pipe, 14, an anode liquid inlet hose, 15, an anode liquid outlet hose, 16, an anode liquid inlet main pipe, 17, an anode main pipe, 18, a single-piece gas-liquid separator, 19, a brine heat exchanger, 20, a low-pressure steam pipeline, 21, a chlorine utilization unit, 22, a caustic soda utilization unit, 23, a gas suction and pressurization device, 24, a chlorine conveying pipeline, 25, a caustic soda conveying pipeline, 26, a cooling circulation loop, 27, a chlorine cooler, 28 and a caustic soda cooler.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.