CN105002519A - Secondary brine refining method for making large scale chelating resin tower achieve water saving effect - Google Patents
Secondary brine refining method for making large scale chelating resin tower achieve water saving effect Download PDFInfo
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- CN105002519A CN105002519A CN201410160800.XA CN201410160800A CN105002519A CN 105002519 A CN105002519 A CN 105002519A CN 201410160800 A CN201410160800 A CN 201410160800A CN 105002519 A CN105002519 A CN 105002519A
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- tower
- resin tower
- chelate resin
- scale
- secondary brine
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention relates to a secondary brine refining method for making a large scale chelating resin tower achieve a water saving effect. According to the present invention, the secondary brine refining method is used in the field of caustic soda production in the chlor-alkali industry, and is the process for providing secondary brine refining for the electrolyte tank; with the secondary brine refining method, the problem of the high water consumption of the secondary brine refining process of the large scale chelating resin tower is solved; with the compressed air use and the material process path adjusting, the refined brine emission, the returning washing loosening of the resin layer, and the uniform mixing of the solution during acid and alkali regeneration are completed by using the compressed air; the purified water for the process is saved while the problems of waste of the refined brine, poor resin regeneration effect, alkali waste caused by low regenerating acid-alkali utilization rate, and more generated waste liquid are solved; and the energy consumption is reduced, and the process operating cost is reduced.
Description
Technical field
The sodium chloride solution (i.e. secondary brine) that the present invention relates to chemical industry is refined, and is specifically related to use chelate resin tower to remove the secondary brine rectification process of hetero-ion in sodium chloride solution, is a kind of secondary brine rectification method of water saving.
Background technology
At present, production of caustic soda technique is ion-exchange membrane electrolyzer caustic soda preparing process mainly, and the raw material sodium chloride solution entering ion-exchange membrane electrolyzer has to pass through secondary brine rectification.Current secondary brine rectification method mainly uses the hetero-ion in chelate resin tower removal sodium chloride solution.Resin in tower must carry out loosening and regenerating by off-line by chelate resin tower after operation after a while.Loose and the regeneration of resin needs to use more pure water.To process 240m
3the secondary brine process system of/h sodium chloride solution is example, and the pure water amount of an interior chelate resin tower use of regeneration period (24 hours) is about 225m
3, wherein about 130m
3waste water is mixed into, 95m with regeneration bronsted lowry acids and bases bronsted lowry liquid
3recovery light salt brine is mixed into refined brine.
After 2005, small-scale device seldom occurs, the resin tower apparatus in secondary brine rectification process is also increasing.The shortcoming that secondary brine device water loss is large highlights more.Especially in the last few years energy-saving and emission-reduction were kept a firm hand on by country, and existing technical maturity is in the demand that more and more can not meet reality a lot of year in the past.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of method making chelate resin tower secondary brine rectification process save pure water, significantly reduce the problem that diameter is large more than the maximization chelate resin tower pure water consumption of 800mm, present invention optimizes discharge opeing and chela and resin regeneration mode simultaneously, reduce the growing amount reclaiming light salt brine and waste water, improve resin regeneration effect, the percentage of damage reducing resin decreases the consumption of resin.
For realizing above-mentioned object, present invention employs following technical scheme:
I, adopt 3 resin tower process, 1 chelate resin tower A, 2 chelate resin tower B, 3 chelate resin tower C, wherein two tower on-line operations, a tower (for 3 chelate resin tower C) regenerated offline;
II, pressurized air enter by 5 gas distributors on 3 chelate resin tower C tops and 6 gas sparger of bottom the regeneration that chelate resin tower completes resin by 4 compressed air control valves respectively according to the sequential of setting;
III,
iIin, the regenerate synchronous of the blowout of loose, the broken resin of the recovery of refined brine, resin, the discharge of acid regeneration liquid, the discharge of alkaline regeneration solution and resin completes;
IV, 1 chelate resin tower A, 2 chelate resin tower B are the same with 3 chelate resin tower C has 5 gas distributors on top, has 6 gas sparger in bottom, can be with
iIin mode complete the regeneration of resin;
V, pressurized air require as mesolow, the dustless gas without oil.Transport pipe material be stainless steel 304 and more than, the part contacted may be had to use titanium material with sodium chloride solution.Pipeline can arrange the optimal control such as tensimeter, under meter.
Its effect of the method that the present invention shows is: the pressurized air that technique uses uses original process pipe, can enter chelate resin tower when not increasing Self controlling valve on original pipeline by the upper lower nozzle of original process equipment-chelate resin tower.The pressurized air entering chelate resin tower by upper orifice 5 gas distributor can get rid of refined brine in resin tower and regeneration soda acid, and the pure water used before substituted for, greatly reduces the consumption of pure water.And thoroughly replace by pressurized air the step that the backwash of large discharge pure water loosens resin, this step not only greatly can reduce the use of pure water, also makes the effect of loose resin more perfect, greatly improves resin regeneration effect.In acid regeneration and alkali regenerative process, pass into pressurized air by lower nozzle 6 gas sparger of resin tower and play disturbance mixing effect, make resin regeneration more abundant, solve the incomplete problem of resin regeneration.Use pressurized air to substitute pure water discharge opeing, make the refined brine in the regeneration period directly enter refined salt water pot, no longer produce recovery light salt brine and reduce energy consumption, in like manner decrease the discharge of resin regeneration acidic and alkaline waste water.The saving of pure water, the minimizing of wastewater flow rate greatly reduce the cost of technique.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of large-scale chelate resin tower water-saving method of the present invention.
Fig. 2 is chelate resin tower of the present invention regeneration general flow chart.
Embodiment
Below in conjunction with Fig. 1, Fig. 2, the specific embodiment of the present invention is described further:
The sodium chloride solution that ion-exchange membrane electrolyzer uses has to pass through secondary brine rectification system and removes the metal hetero-ions such as Ca, Mg, and this native system primary device is 3 chelate resin towers and periphery supporting pipelines, as shown in Figure 1.During systems in operation, any two tower on-line operations in 3 towers, another tower regenerated offline.
As shown in Fig. 1 of the present invention, 1 chelate resin tower A, 2 chelate resin tower B on-line operations, namely the sodium chloride solution from front-end-of-line can enter ion-exchange membrane electrolyzer successively and use after two towers.3 chelate resin tower C now enter the regenerated offline stage, and its technical process is as shown in Fig. 2 of the present invention.
In operation 8, pressurized air is after 4 compressed air control valves, enter in tower by 3 chelate resin tower C upper orifices, pressurized air is full of tower by 5 gas distributor stable and uniform in tower, refined brine in discharge tower is to subsequent fine saline slot, the use that this step not only eliminates pure water also makes the refined brine in tower directly be utilized, no longer produce and need the light salt brine returning front end operation, greatly reduce energy consumption;
In operation 9, pressurized air will enter in tower by 3 chelate resin tower C lower nozzle, and pressurized air is full of tower uniformly by 6 gas sparger in tower, due in now tower not containing liquid, 6 gas sparger only play the effect of gas distributor.Equally distributed gas at the bottom of tower by resin layer compacted in loose tower fast, simultaneously by the resin strip of fragmentation to resin layer top, in follow-up operation, take chelate resin tower out of; This operation all can use in the regenerative process that chelate resin tower is each, can ensure that in tower, resin remains at loose state like this, not only can ensure the processing power of chelate resin tower, can also reduce the resistance of resin layer, the crushing reducing resin reduces running cost.Compressed-air actuated pressure and flow can do trace adjustment according to the difference of resin brand, also can adjust according to the change of chelate resin tower tower diameter.
Operation 10 is acid regeneration processes of chelate resin tower, the acid solution of resin regeneration is entered by chelate resin tower upper orifice in this process, uniform spray is on resin layer, and now pressurized air is by with certain pressure and flow, 6 gas sparger at the bottom of chelate resin tower tower distribute backlash uniformly to resin layer.Pressurized air will blow resin layer, and resin particle is contacted fully with regeneration acid solution; Pressurized air, under the effect of 6 gas sparger, forms a large amount of bubbles in acid solution, and continuous contact pressure resin in bubble uphill process also breaks and improves the mixed effect of acid solution and resin; The convection flow of pressurized air and acid solution, make pressurized air constantly bottom acid solution is promoted to resin layer, allows the concentration distribution of acid more evenly improve acid-utilising rate, also increase the disturbance of liquid simultaneously, and these act on all significant increase regeneration efficiencies of resin.After certain hour, pressurized air changes and enters in tower by chelate resin tower upper orifice, tower is full of by 5 gas distributor stable and uniform in tower, and the acid waste water of discharging in tower is to wastewater trough, this has not only saved the pure water of discharge opeing, also solves the problem of the introducing increase wastewater flow rate due to pure water simultaneously.In a word, this operation solves resin regeneration weak effect in technique in the past, and regenerating acid utilization ratio is low causes acid waste and the many shortcoming of the spent acid solution that generates with not enough.
Operation 11 is alkali regenerative processes of chelate resin tower, and its content of operation is the same with operation 11, solves resin regeneration weak effect in technique in the past, the shortcoming that the low waste lye causing alkali to waste and to generate of regenerating alkali utilization ratio is many.
To be chelate resin towers pass into refined brine to operation 12 after pure water cleaning waits for use of reaching the standard grade.
As mentioned above, the present invention well solves the large problem of the pure water usage quantity of large-scale chelate resin tower secondary brine rectification process, also solve refined brine waste in technique in the past, resin regeneration weak effect, the shortcoming that the low waste liquid causing alkali to waste and to generate of regenerated acid and alkali utilization ratio is many simultaneously.
Below be only that 3 tower flow processs are described, for two Tower Systems (a tower on-line operation one tower regenerated offline) technique also in the protection domain of the claims in the present invention.In addition, for those skilled in the art, make other according to technical scheme described above and conception and change accordingly and distortion, and all these change and are out of shape also all in the protection domain of the claims in the present invention.
Claims (8)
1. make the secondary brine rectification method that large-scale chelate resin tower is economized on water, it is characterized in that:
Stock liquid is through the sodium chloride solution after primary brine process process, needs to deviate from Ca wherein, the metal hetero-ions such as Mg;
Use the large-scale chelate resin tower of multiple stage;
Pressurized air is used to carry out the regeneration of chelate resin tower.
2. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, is characterized in that, the salt solution removing metal hetero-ion can be the solution of lower concentration, also can be saturated solution.
3. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, it is characterized in that, the quantity of chelate resin tower is more than two (containing two); Can be continuous operation, also can be intermittent operation.
4. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, it is characterized in that, the diameter of chelate resin tower is at more than 800mm (containing 800mm).
5. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, is characterized in that, uses certain pressure and pulse compression air; Pneumatic line uses stainless steel 304 and above material, and pipeline can arrange pressure, flow, temperature equal controller, also can not arrange.
6. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, is characterized in that, the refined brine using pressurized air to discharge in tower is directly used in subsequent handling, gets rid of acid, alkali regeneration waste liquid in tower; Use pressurized air to loosen resin, improve resin and to loosen effect; Pressurized air is mixed with acid regeneration liquid adverse current, promotes the acid regeneration effect of resin; Pressurized air is mixed with alkaline regeneration solution adverse current, promotes the alkali regeneration effect of resin.
7. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, is characterized in that, is loosened and the raising of regeneration effect reduces the loss of resin by resin.
8. a kind of secondary brine rectification method that large-scale chelate resin tower is economized on water as claimed in claim 1, it is characterized in that, large-scale chelate resin tower upper cover goes out to be provided with the distribution apparatus of gas and liquid, and bubbling device or distribution apparatus or bubbling and distribution apparatus are contained in bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160800.XA CN105002519A (en) | 2014-04-22 | 2014-04-22 | Secondary brine refining method for making large scale chelating resin tower achieve water saving effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160800.XA CN105002519A (en) | 2014-04-22 | 2014-04-22 | Secondary brine refining method for making large scale chelating resin tower achieve water saving effect |
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| CN105002519A true CN105002519A (en) | 2015-10-28 |
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| CN201410160800.XA Pending CN105002519A (en) | 2014-04-22 | 2014-04-22 | Secondary brine refining method for making large scale chelating resin tower achieve water saving effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123882A (en) * | 2020-03-01 | 2020-05-08 | 天伟化工有限公司 | DCS control method for improving chelating resin utilization rate in secondary refining of brine |
| CN112295610A (en) * | 2020-10-24 | 2021-02-02 | 李通 | Chelate resin regeneration process in secondary brine refining process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202671257U (en) * | 2012-06-21 | 2013-01-16 | 内蒙古君正化工有限责任公司 | Loosening device of resin layer of chelating resin tower |
| CN103607321A (en) * | 2013-11-18 | 2014-02-26 | 华中科技大学 | FCoE virtual link fault detection method |
-
2014
- 2014-04-22 CN CN201410160800.XA patent/CN105002519A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202671257U (en) * | 2012-06-21 | 2013-01-16 | 内蒙古君正化工有限责任公司 | Loosening device of resin layer of chelating resin tower |
| CN103607321A (en) * | 2013-11-18 | 2014-02-26 | 华中科技大学 | FCoE virtual link fault detection method |
Non-Patent Citations (1)
| Title |
|---|
| 高锁成: "盐水二次精制工艺控制", 《中国氯碱》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123882A (en) * | 2020-03-01 | 2020-05-08 | 天伟化工有限公司 | DCS control method for improving chelating resin utilization rate in secondary refining of brine |
| CN112295610A (en) * | 2020-10-24 | 2021-02-02 | 李通 | Chelate resin regeneration process in secondary brine refining process |
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Application publication date: 20151028 |
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