CN107881527A - The decomposition method of chlorate and the system using this method in a kind of ion film caustic soda - Google Patents
The decomposition method of chlorate and the system using this method in a kind of ion film caustic soda Download PDFInfo
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- CN107881527A CN107881527A CN201711127577.9A CN201711127577A CN107881527A CN 107881527 A CN107881527 A CN 107881527A CN 201711127577 A CN201711127577 A CN 201711127577A CN 107881527 A CN107881527 A CN 107881527A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
- C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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Abstract
System the present invention relates to a kind of decomposition method of chlorate in ion film caustic soda and using this method, decomposition method are：Add after liquid formaldehyde is well mixed and reacted in the salt solution of chloride hydrochlorate after electrolysis.Include the electrolytic cell of sequential communication using the system of this method, anolyte circulating pump, brine flowmeter, pipe-line mixer and chlorate decomposer, and salt acid storage tank and formaldehyde storage tank with these members, the gas-phase space of chlorate decomposer connects with chlorine house steward and is provided with liquid level gauge on its cylinder, liquid Space, which is connected with dechlorinator and is provided with connecting tube, decomposes liquid pump and fluid level control valve, liquid phase flow direction is directly to be pumped with decomposed solution toward dechlorinator or by chlorate decomposer overflow to light salt brine storage tank, then with the past dechlorinator of pumping, liquid level gauge and fluid level control valve connect and compose closed-loop control system with DCS respectively.The decomposing system of the present invention is simple in construction, and decomposition method has that energy consumption is small, cost is low and the advantages of without potential security risk.
Description
Technical field
The invention belongs to production of caustic soda field, the set system is used for Hai Jie companies LSZ projects, is a composition in project
Part, LSZ are formaldehyde, and in particular to the decomposition method of chlorate and the system using this method in a kind of ion film caustic soda.
Background technology
The production technology of ion-exchange membrane caustic soda is the prevailing technology of China's chlor-alkali production, in the work of macrocyclic chlor-alkali production
In dynamic, because the salt solution that ion-exchange membrane electrolysis use uses closed cycle, chlorate can gradually accumulate in brine system, and reach
To at a relatively high concentration, the harmful effect serious to the production active belt of company.
As shown in figure 1, mechanism caused by chlorate is as follows in the production activity of ionic membrane method production caustic soda：
Ionic membrane method production caustic soda electrolysis main reaction be：
2NaCl+2H2O→2NaOH+C12+H2
With the progress of reaction, it also occur that side reaction, chlorate is the main side reaction product of electrolysis, its generating process
It is broadly divided into the generation of hypochlorite and hypochlorite further reacts the generation step of chlorate two.Chlorate is mainly in anode chamber
Caused, when refined brine enters electrolyzer anode chamber and logical direct current electrolysis, caused chlorine occurs such as after meeting water on anode
Lower two kinds of reactions：
1. disproportionated reaction of the chlorine in water, i.e.,：
C12+H2O=HCl+HC1O
6HC1O+NaCl=NaClO3+3C12+3H2O
2. the reaction of chlorine oxidation water
C12+H2O=2HCl+1/2O2
The probability height of both the above reaction depends primarily on the pH value of salt solution.When pH value is less than 4.8, oxidation water is only existed
Reaction, without occur disproportionated reaction；When pH value is more than 4.8, oxidation reaction and disproportionated reaction exist simultaneously；PH value is 5~7
When, oxidation potential is more than disproportionation trend, based on oxidation reaction.It can be seen that it is exactly to reduce chlorate production to advocate using acid brine
One of raw important measures；
Due to OH-Migration, infiltration and diffusion and salt solution bring excess base into and be gathered in anode chamber, with generation
Following reaction occurs for HClO：
NaOH+HClO=NaClO+H2O
Increase when the sodium hypochlorite of generation accumulates, quickly become sodium chlorate in acid condition：
NaClO+2HClO=NaClO3+2HCl
Under the conditions of certain temperature (75 DEG C), sodium hypochlorite can also occur to react as follows：
3NaClO=NaClO3+2NaCl
Sodium chlorate is generated, meanwhile, ClO-Gather it is a certain amount of after, due to ClO-Compare Cl-Discharge potential it is low, on anode
ClO-Discharge, exoelectrical reaction is as follows：：
12C1O-+6H2O-12e-=4HClO3+8HCl+3O2
The HClO of generation3, further acted on the next NaOH of negative electrode diffusion, generate sodium chlorate：
HClO3+ NaOH=NaClO3+H2O
The too high harm of chlorate content is as follows：
1) when chlorate content is higher in salt solution, a part of ClO3 -Cathode chamber can be diffused into through ionic membrane, cause alkali
Middle chlorate is higher, corrodes alkali evaporation plant equipment and pipeline；
2) the higher sodium chloride content that can make in salt solution of chlorate content is reduced in salt solution, and current efficiency declines.It is estimated that
The mass concentration of sodium chloride often reduces 10g/l, and current efficiency will decline 1%；
3) chlorate can produce hypochlorous acid when chelate resin tower regenerates, and so as to corrosion damage chelating resin, cause resin
Activated adoption ability declines even poison deactivation, and serious potential safety hazard is brought to ionic membrane operation；
4) chlorate is accumulated in anode-side, the big pad of easy erosion unit groove anode and outlet minipad, and then corrodes single
First groove sealing surface, causes electrolytic cell to leak；
5) in salt solution course of dissolution, sodium chloride concentration is easily influenceed by the collaboration of perchlorate concentration, works as perchlorate concentration
When higher (more than 30g/L), it is relatively low to easily cause anode solution concentration, and water migration quantitative change is big, and ionic membrane is got blister.
Therefore, perchlorate concentration is the important salt solution index in ion film caustic soda production activity, and its content generally requires control
System is within 5g/L.
At present, the method for the conventional control chlorate content in industry has following several：
(1) qualified ionic membrane is changed in time
In the process of running, due to the cumulative function of concentration gradient and electric potential gradient, ion can occur ion-exchange membrane electrolyzer
Migration, therefore a small amount of OH can inevitably occur in anode electrolytic cell-, but ionic membrane run the later stage, due to aged deterioration,
The many reasons such as the attachment of mechanical damage and impurity and dissolving, pin hole and sand holes on ionic membrane can become more.These pin holes and sand
The presence of eye can cause to ooze alkali, it is necessary to more renewing film in time when mass fraction is more than 0.02% and the above；
(2) acid brine technique is used
Enter that the pH value of groove salt solution is too high, the meltage of electrode side reaction and chlorine can be caused to increase, oxygen content increases in chlorine, sun
Electrode current efficiency declines, C1O-And C1O3 -Increase Deng impurity.The pH value of secondary brine is adjusted to 3.5~4.5, can be neutralized from the moon
The OH of pole infiltration-, effectively cut down OH-Quantity, reduce OH-And Cl-Contact probability, so as to effectively reduce chlorate
Generation.It can be seen from data introduction：When the pH value of anode is less than 4.3, the growing amount of chlorate is seldom, and is approximately proportional to
OH-Concentration, wherein chlorate is generated by electrochemistry direction, i.e.,：
6C1O-+3H2O→2C1O3 -+3/2O2+4C1-+6H++6e-
When the pH value of anolyte is more than 4.3, the generation of chlorate is with OH-The increase of concentration and drastically increase, its reason
It is：The chlorate of electrochemical reaction generation presses OH-The proportional increase of concentration, and chemically react generation chlorate press OH-It is dense
The increase of 6 th Roots is spent into, wherein the chemical reaction of generation chlorate is：2HC1O+4C1O-→2C1O3 -+4C1-+2H+；
(3) concentration of catholyte is properly increased
After the long-term conductive operation of ionic membrane, its physical relaxation can be caused due to being swelled and shrinking, causes microphase-separated, enters
And cause the optimum operation condition for having changed ionic membrane.According to the design of ionic membrane, the concentration range of catholyte will ensure to obtain
Optimum current efficiency.In actual production, when properly increasing cathode liquid concentration within the specific limits, the carboxylic layer water of ionic membrane contains
Amount can be reduced accordingly, and then OH-Entering the amount of anode chamber by cathode chamber will be reduced, and caused chlorate is just few；
Above-mentioned three kinds of methods can only solve the problems, such as a period of time, but as the passage of run time, chlorate still occur
The trend quickly to go up, and then have influence on the progress of normal activity；
(4) according to the productive prospecting of ion-exchange membrane caustic soda, using exhaust method
Light salt brine after dechlorination is being sent into the discharge of salt dissolving tank forward part, whereby can in reduction system sodium chlorate accumulation.Should
Method need not add any chemicals, without using steam, although can reach the purpose for saving material consumption energy consumption, and the salt solution meeting of discharge
Environment is polluted, and loses a part of salt solution, the corresponding increase of production cost can be caused, do not meet energy-saving and emission-reduction, green chlor-alkali
Theory；
(5) according to the chemical property of sodium chlorate, using chemical removal method
Chlorate is more stable under conditions of normal temperature and alkali, and the chlorate gone in demineralized water must is fulfilled for two conditions：
Higher temperature (more than 85 DEG C) and stronger acidity (acidity is in 2.3mol/l or so), its specific reaction equation are as follows：
ClO3 -+ 6HCl=Cl-+3Cl2+3H2O
ClO3 -+ 2HCl=Cl-+1/2Cl2+H2O+ClO2
But this method has the following disadvantages：
A. higher is required to temperature and controlling pH, chlorate resolving device device is damaged big；
B. it can be seen that from reaction condition and want to make chlorate decompose completely, it is necessary to add six times of chlorate molal quantity
Amount, hydrochloric acid could keep reacting effective progress of (1), therefore consume substantial amounts of caustic soda in dechlorination process, be unfavorable for cost control
Make and energy-saving；
C. the reaction (2) of above-mentioned chemical removal method is while chlorate decomposes, and inevitably produces chlorine dioxide, and two
Chlorine monoxid is extremely unstable, and heated or chance light easily resolves into oxygen and chlorine, sets off an explosion, so as to which the normal production to chemical system causes
Great threat；
D. chlorine dioxide is mixed in chlorine as byproduct, can cause follow-up a series of problems for using chlorine unit, such as
During for chlorination reaction, oxidative phenomena can be caused, product discoloration is even burnt.In some chlorination reactions, chlorine dioxide
Product can be made to form oxide layer, prevent continuing for chlorination reaction, therefore caused chlorine dioxide not only has harm to technique,
And there is potential security risk.
Therefore, study that a kind of energy consumption is small, cost is low, chloric acid in easy to operate and ion film caustic soda without potential security risk
The decomposition method tool of salt is of great significance.
The content of the invention
The invention aims to overcome decomposition method high energy consumption, the life of chlorate in ion film caustic soda in the prior art
Production cost is high, cumbersome and can have the problem of potential security risk, there is provided a kind of energy consumption is small, cost is low, easy to operate
And the decomposition method of chlorate and the system using this method in the ion film caustic soda without potential security risk, the set system is mesh
Preceding LSZ systems.
In order to achieve the above object, the technical solution adopted by the present invention is：
The decomposition method of chlorate in a kind of ion film caustic soda, liquid first is added in the salt solution of chloride hydrochlorate after electrolysis
Reacted after aldehyde is well mixed.
As preferable technical scheme：
The decomposition method of chlorate, mass concentration is used before adding liquid formaldehyde in a kind of ion film caustic soda as described above
For 31% or 18% hydrochloric acid adjust salt solution pH be -0.5~3, this be due to chlorate in the basic conditions it is highly stable not
Easily decompose, only can just be decomposed under acid condition and certain temperature.
The decomposition method of chlorate in a kind of ion film caustic soda as described above, when reaction starts, chlorate in salt solution
Mole is higher than the mole of liquid formaldehyde, and chlorate must be excessive.
The decomposition method of chlorate in a kind of ion film caustic soda as described above, temperature >=90 DEG C of the reaction, due to
Chlorate is exothermic reaction with formaldehyde reaction, therefore without additionally increasing steam heating, time >=1.5h of reaction, the pressure of reaction
Power is normal pressure.
The decomposition method of chlorate in a kind of ion film caustic soda as described above, the concentration of chlorate is not in salt solution after reaction
Less than 0g/L, the present invention need not add steam, while hydrochloric acid consumption can be greatly reduced, and salt solution is heated to by former process steam
More than 85 DEG C, hydrochloric acid is then added, chlorate is reacted with hydrochloric acid, is decomposed, and mass concentration is 31% or 18% (conversion
It is 1 into hydrochloric acid 31%) and the ratio of salt solution:7, the consumption of hydrochloric acid is larger, and excessive hydrochloric acid need to consume alkali neutralization, and the present invention makes
After formaldehyde, when chlorate decomposes, mass concentration is reduced to for the hydrochloric acid of 31% or 18% (being converted to 31%) and the ratio of salt solution
1:35, significantly reduce the consumption of bronsted lowry acids and bases bronsted lowry.
Present invention also offers a kind of chlorate decomposing system of described decomposition method, including electrolytic cell, anolyte to follow
Ring pump, brine flowmeter, pipe-line mixer, chlorate decomposer, hydrochloric acid flowmeter, formaldehyde flowmeter, salt acid storage tank, formaldehyde storage
Groove, chlorine house steward, dechlorinator, decomposition liquid pump, liquid level gauge, fluid level control valve, DCS and multiple connecting tubes；
Wherein formaldehyde storage tank is preferably stored using stainless steel storage tank, and volume size can determine according to demand, reservoir structure
It is preferably vertical, further, since formaldehyde is more sensitive to temperature, when the relatively low long-time of temperature is stood, easily crystallization, so bottom
Need to set heat tracing pipeline, cylinder insulation, keep liquid formaldehyde temperature to maintain not less than 45 DEG C, while formaldehyde pipeline is also required to
Insulation；
Electrolytic cell, anolyte circulating pump, brine flowmeter, pipe-line mixer and chlorate decomposer sequential communication, salt solution
The outlet of flowmeter is connected with the entrance of pipe-line mixer, and the entrance of brine flowmeter passes through with the liquid outlet of salt acid storage tank to be connected
Pipe I is connected, and hydrochloric acid flowmeter is provided with connecting tube I, and the entrance of pipe-line mixer passes through with the liquid outlet of formaldehyde storage tank to be connected
Pipe II is connected, and formaldehyde flowmeter is provided with connecting tube II；
The gas-phase space of chlorate decomposer is connected with chlorine house steward, and liquid Space and the dechlorinator of chlorate decomposer are led to
Cross connecting tube III to connect, decomposition liquid pump is installed in connecting tube III, liquid phase flow direction there are two kinds：One kind is directly to be pumped with decomposed solution
Toward dechlorinator；Another kind is the overflow of chlorate decomposer to light salt brine storage tank, then with pumping toward dechlorinator.
Liquid level gauge (LG) is installed, the exit for decomposing liquid pump is provided with fluid level control valve on chlorate decomposer cylinder
(liquid in chlorate decomposer flows into from the entrance for decomposing liquid pump, outlet outflow), liquid level gauge and fluid level control valve respectively with
DCS connects and composes closed-loop control system, shows (LIT) in DCS master control rooms fluid level control valve status display and decomposer liquid level
Picture shows, and by the valve opening of DCS remote control fluid level control valves, realizes the liquid level and fluid level control valve of decomposer
Valve opening interlocking, when liquid level gauge detects that liquid level is too high, increase the valve opening of fluid level control valve so that chloric acid salinity
Liquid level is gradually reduced in solution groove；When liquid level gauge detects that liquid level is too low, reduce the valve opening of fluid level control valve so that chloric acid
Liquid level declines slow in salt decomposer, and with the supplement of salt solution, liquid level is gradually increasing.
As preferable technical scheme：
Chlorate decomposing system as described above, is also equipped with pressure gauge (PG) at the decomposed solution pump discharge, pressure gauge,
Decompose liquid pump and brine flowmeter is connected with DCS respectively, decomposed solution pump discharge pressure is shown into (PIT), decomposes liquid pump start and stop letter
Number and brine flowmeter flow indication (FIC) shown in DCS master control room pictures, and opened by DCS remote controls and site setup
Stop the start and stop that liquid pump is decomposed in button control.
Chlorate decomposing system as described above, decomposition liquid pump A and the decomposed solution decomposed liquid pump and include being connected in parallel
Pump B, the inlet and outlet for decomposing liquid pump A and decomposition liquid pump B are connected with connecting tube III, only open divide in actual use respectively
Solve liquid pump A, decompose liquid pump B make it is standby, when decompose liquid pump A break down when, can in time tackle, not influence the normal of system
Operation；
Multiple check-valves are installed respectively in the connecting tube I, connecting tube II and connecting tube III.
Chlorate decomposing system as described above, the liquid in-out mode of the chlorate decomposer is low in and high out；It is described
Chlorate decomposer is horizontal type structure, and inside is provided with baffle plate up and down staggeredly, or the chlorate decomposer is vertical knot
Structure, distributor is installed in feed tube.
Chlorate decomposing system as described above, the material of the chlorate decomposer is titanium or vinyl D-470 trees
Fat fiberglass.
Inventive principle：
The present invention greatly reduces out chlorine in groove salt solution by being uniformly added into formaldehyde in chlorate decomposer, by reaction
The content of hydrochlorate, while the consumption of hydrochloric acid is reduced, the decomposition of chlorate is based primarily upon the reaction of formaldehyde and chlorate, specifically
Reaction equation is as follows：
2NaClO3+ 3HCHO=3CO2↑+2NaCl+3H2O；
The reaction can occur at ambient pressure, and be exothermic reaction, and heat caused by reaction can be used in decomposer
Salt solution heats, and then improves reaction speed, thus the present invention is without to going out the heating of groove salt solution, it is not required that adds steam, operation
Simply, the energy is saved, the consumption of hydrochloric acid and the consumption of the alkali for neutralizing hydrochloric acid is greatly reduced, reduces and be produced into
This.
Beneficial effect：
(1) in a kind of ion film caustic soda of the invention chlorate decomposition method, reacted using formaldehyde and chlorate,
Greatly reduce the consumption of hydrochloric acid and the consumption of the alkali for neutralizing hydrochloric acid, cost are low.
(2) in a kind of ion film caustic soda of the invention the decomposition method of chlorate system, keep existing process route not
Become, existing process units is undergone technological transformation, without to going out the heating of groove salt solution, it is not required that add steam, simple to operate, energy
Consume small, there is fabulous economic value and promotional value.
Brief description of the drawings
Fig. 1 is the mechanism of production figure of chlorate during ion-exchange membrane electrolysis；
Fig. 2 is the schematic diagram of the chlorate decomposing system of the present invention；
Wherein, 1- electrolytic cells, 2- decompose liquid pump A, 3- and decompose liquid pump B, 4- brine flowmeter, 5- pipe-line mixers, 6- chlorine
Hydrochlorate decomposer, 7- hydrochloric acid flowmeters, 8- formaldehyde flowmeters, 9- chlorine house stewards, 10- dechlorinators, 11-DCS, 12- salt acid storage tank,
13- formaldehyde storage tanks.
Embodiment
The invention will be further elucidated with reference to specific embodiments.It should be understood that these embodiments are merely to illustrate this hair
Bright rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, art technology
Personnel can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Fixed scope.
Embodiment 1
The decomposition method of chlorate, step are in a kind of ion film caustic soda：
(1) it for the pH of salt solution of the chloride hydrochlorate after 31% hydrochloric acid regulation electrolysis is -0.5 to use mass concentration；
(2) reacted after the salt solution of the chloride hydrochlorate after regulation is well mixed with liquid formaldehyde, when reaction starts, salt
The addition of the mole ratio liquid formaldehyde of chlorate is high by 20% in water, and the temperature of salt solution is 90 DEG C during reaction, the time of reaction
1.5h, the pressure of reaction is normal pressure.The concentration of chlorate is 0.5g/L in salt solution after reaction.
Embodiment 2
The decomposition method of chlorate, step are in a kind of ion film caustic soda：
(1) it for the pH of salt solution of the chloride hydrochlorate after 31% hydrochloric acid regulation electrolysis is 0.8 to use mass concentration；
(2) reacted after the salt solution of the chloride hydrochlorate after regulation is well mixed with liquid formaldehyde, when reaction starts, salt
The addition of the mole ratio liquid formaldehyde of chlorate is high by 19% in water, and the temperature of salt solution is 95 DEG C during reaction, the time of reaction
For 3h, the pressure of reaction is normal pressure.The concentration of chlorate is 0.2g/L in salt solution after reaction.
Embodiment 3
The decomposition method of chlorate, step are in a kind of ion film caustic soda：
(1) it for the pH of salt solution of the chloride hydrochlorate after 18% hydrochloric acid regulation electrolysis is 2.3 to use mass concentration；
(2) reacted after the salt solution of the chloride hydrochlorate after regulation is well mixed with liquid formaldehyde, when reaction starts, salt
The addition of the mole ratio liquid formaldehyde of chlorate is high by 13% in water, and the temperature of salt solution is 91 DEG C during reaction, the time of reaction
For 1.5h, the pressure of reaction is normal pressure.The concentration of chlorate is 0.6g/L in salt solution after reaction.
Embodiment 4
The decomposition method of chlorate, step are in a kind of ion film caustic soda：
(1) it for the pH of salt solution of the chloride hydrochlorate after 31% hydrochloric acid regulation electrolysis is 1.1 to use mass concentration；
(2) reacted after the salt solution of the chloride hydrochlorate after regulation is well mixed with liquid formaldehyde, when reaction starts, salt
The addition of the mole ratio liquid formaldehyde of chlorate is high by 14% in water, and the temperature of salt solution is 95 DEG C during reaction, the time of reaction
For 2h, the pressure of reaction is normal pressure.The concentration of chlorate is 1g/L in salt solution after reaction.
Embodiment 5
The decomposition method of chlorate, step are in a kind of ion film caustic soda：
(1) it for the pH of salt solution of the chloride hydrochlorate after 18% hydrochloric acid regulation electrolysis is 3 to use mass concentration；
(2) reacted after the salt solution of the chloride hydrochlorate after regulation is well mixed with liquid formaldehyde, when reaction starts, salt
The addition of the mole ratio liquid formaldehyde of chlorate is high by 10% in water, and the temperature of salt solution is 98 DEG C during reaction, the time of reaction
For 2.5h, the pressure of reaction is normal pressure.The concentration of chlorate is 0g/L in salt solution after reaction.
Embodiment 6
Using the chlorate decomposing system of the decomposition method of embodiment 1~5, as shown in Fig. 2 being followed including electrolytic cell 1, anolyte
Ring pump, brine flowmeter 4, pipe-line mixer 5, chlorate decomposer 6, hydrochloric acid flowmeter 7, formaldehyde flowmeter 8, salt acid storage tank
12nd, formaldehyde storage tank 13, chlorine house steward 9, dechlorinator 10, decomposition liquid pump, liquid level gauge, fluid level control valve, DCS 11 and multiple connections
Pipe.
Electrolytic cell 1, anolyte circulating pump, brine flowmeter 4, pipe-line mixer 5 and the sequential communication of chlorate decomposer 6,
The outlet of brine flowmeter 4 connects with the entrance of pipe-line mixer 5, and the entrance of brine flowmeter 4 goes out liquid with salt acid storage tank 12
Mouth is connected by the 7' of connecting tube I, and hydrochloric acid flowmeter 7, entrance and the formaldehyde storage tank of pipe-line mixer are provided with the 7' of connecting tube I
Liquid outlet is connected by the 8' of connecting tube II, and formaldehyde flowmeter 8 is provided with the 8' of connecting tube II.The gas phase of chlorate decomposer 6 is empty
Between connected with chlorine house steward 9, the liquid Space of chlorate decomposer 6 is connected with dechlorinator 10 by the 10' of connecting tube III, connecting tube
It is provided with III 10' and decomposes liquid pump A2 and decompose liquid pump B 3, liquid phase flow direction there are two kinds：One kind be it is direct with decompose liquid pump A2 or
Decompose liquid pump B 3 and be sent to dechlorinator 10；Another kind is the overflow of chlorate decomposer 6 to light salt brine storage tank, then with pumping toward de-
Chlorine tower 10.The inlet and outlet for decomposing liquid pump A 2 and decomposition liquid pump B 3 is connected with the 10' of connecting tube III respectively, actually uses process
In only open and decompose liquid pump A 2, decompose liquid pump B 3 and make standby, when decomposing liquid pump A 2 and breaking down, can tackle in time,
The normal operation of system is not influenceed.Multiple check-valves are installed respectively on the 7' of connecting tube I, the 8' of connecting tube II and the 10' of connecting tube III.
Liquid level gauge (LG) is installed on the cylinder of chlorate decomposer 6, liquid pump A 2 is decomposed and decomposes liquid pump B 3 exit
Fluid level control valve (liquid in chlorate decomposer 6 flows into from the entrance for decomposing liquid pump, outlet outflow) is installed, liquid level gauge and
Fluid level control valve connects and composes closed-loop control system with DCS 11 respectively, and fluid level control valve status display decomposer liquid level is shown
(LIT) show, and by the valve opening of the remote control fluid level control valves of DCS 11, realize point in the master control room pictures of DCS 11
Solve the liquid level of groove and the valve opening of fluid level control valve interlocks, when liquid level gauge detects that liquid level is too high, increase fluid level control valve
Valve opening so that liquid level is gradually reduced in chlorate decomposer；When liquid level gauge detects that liquid level is too low, reduce liquid level control
The valve opening of valve processed so that liquid level declines slow in chlorate decomposer, and with the supplement of salt solution, liquid level is gradually increasing.
Decompose liquid pump A 2 and decompose the exits of liquid pump B 3 and be also equipped with pressure gauge (PG), pressure gauge, decompose the and of liquid pump A 2
Decompose liquid pump B 3 and brine flowmeter 4 is connected with DCS 11 respectively, decomposed solution pump discharge pressure is shown into (PIT), decomposes liquid pump
Start stop signal and brine flowmeter flow indication (FIC) show in the master control room pictures of DCS 11, and by DCS11 remote controls and
The start and stop of liquid pump are decomposed in the control of site setup start-stop button.
Chlorate decomposer 6 is horizontal type structure, inside be provided with up and down staggeredly baffle plate, liquid in-out mode for it is low enter height
Go out, the material of chlorate decomposer 6 is titanium or vinyl D-470 resin glass fibre reinforced plastics.
Embodiment 7
Using the chlorate decomposing system of the decomposition method of embodiment 1~5, the connected mode and embodiment of each part are the same as real
Example 6 is applied, the difference is that used chlorate decomposer 6 is vertical structure, distributor is installed in feed tube.
Claims (10)
1. the decomposition method of chlorate in a kind of ion film caustic soda, it is characterized in that：Add in the salt solution of chloride hydrochlorate after electrolysis
Enter after liquid formaldehyde is well mixed and reacted.
2. the decomposition method of chlorate in a kind of ion film caustic soda according to claim 1, it is characterised in that add liquid
The pH for using mass concentration to adjust salt solution for 31% or 18% hydrochloric acid before formaldehyde is -0.5~3.
3. the decomposition method of chlorate in a kind of ion film caustic soda according to claim 2, it is characterised in that reaction starts
When, the mole of chlorate is higher than the mole of liquid formaldehyde in salt solution.
4. the decomposition method of chlorate in a kind of ion film caustic soda according to claim 1, it is characterised in that the reaction
Temperature >=90 DEG C, time >=1.5h of reaction, the pressure of reaction is normal pressure.
5. the decomposition method of chlorate in a kind of ion film caustic soda according to claim 4, it is characterised in that salt after reaction
The concentration of chlorate is not less than 0g/L in water.
6. using the chlorate decomposing system of the decomposition method as described in any one of Claims 1 to 5, it is characterized in that：
Including electrolytic cell, anolyte circulating pump, brine flowmeter, pipe-line mixer, chlorate decomposer, hydrochloric acid flowmeter, first
Aldehyde flowmeter, salt acid storage tank, formaldehyde storage tank, chlorine house steward, dechlorinator, decompose liquid pump, liquid level gauge, fluid level control valve, DCS and more
Individual connecting tube；
Electrolytic cell, anolyte circulating pump, brine flowmeter, pipe-line mixer and chlorate decomposer sequential communication, brine flow
The outlet of meter connects with the entrance of pipe-line mixer, and the entrance of brine flowmeter passes through connecting tube I with the liquid outlet of salt acid storage tank
Connect, hydrochloric acid flowmeter is installed in connecting tube I, the entrance of pipe-line mixer passes through connecting tube II with the liquid outlet of formaldehyde storage tank
Connect, formaldehyde flowmeter is installed in connecting tube II；
The gas-phase space of chlorate decomposer connects with chlorine house steward, and liquid Space and the dechlorinator of chlorate decomposer pass through company
Adapter III is connected, and decomposition liquid pump is provided with connecting tube III；
Liquid level gauge is installed on chlorate decomposer cylinder, the exit for decomposing liquid pump is provided with fluid level control valve, liquid level gauge and
Fluid level control valve connects and composes closed-loop control system with DCS respectively.
7. chlorate decomposing system according to claim 6, it is characterised in that be also equipped with the decomposed solution pump discharge
Pressure gauge, pressure gauge, decomposition liquid pump and brine flowmeter are connected with DCS respectively.
8. chlorate decomposing system according to claim 6, it is characterised in that the liquid pump that decomposes includes what is be connected in parallel
Decompose liquid pump A and decompose liquid pump B, the inlet and outlet for decomposing liquid pump A and decomposition liquid pump B is connected with connecting tube III respectively；
Multiple check-valves are installed respectively in the connecting tube I, connecting tube II and connecting tube III.
9. chlorate decomposing system according to claim 6, it is characterised in that the liquid in-out side of the chlorate decomposer
Formula is low in and high out；The chlorate decomposer is horizontal type structure, and inside is provided with baffle plate up and down staggeredly, or the chloric acid
Salt decomposer is vertical structure, and distributor is provided with feed tube.
10. chlorate decomposing system according to claim 9, it is characterised in that the material of the chlorate decomposer is
Titanium or vinyl D-470 resin glass fibre reinforced plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711127577.9A CN107881527A (en) | 2017-11-15 | 2017-11-15 | The decomposition method of chlorate and the system using this method in a kind of ion film caustic soda |
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| CN201711127577.9A CN107881527A (en) | 2017-11-15 | 2017-11-15 | The decomposition method of chlorate and the system using this method in a kind of ion film caustic soda |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481646A (en) * | 2020-10-27 | 2021-03-12 | 江苏奥喜埃化工有限公司 | Chlorate device is removed to potassium chloride salt water |
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Application publication date: 20180406 |