CN1769217A - Industrial ultrapure water preparation process - Google Patents
Industrial ultrapure water preparation process Download PDFInfo
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- CN1769217A CN1769217A CNA2004100679451A CN200410067945A CN1769217A CN 1769217 A CN1769217 A CN 1769217A CN A2004100679451 A CNA2004100679451 A CN A2004100679451A CN 200410067945 A CN200410067945 A CN 200410067945A CN 1769217 A CN1769217 A CN 1769217A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a technique for preparation of industrial ultrapure water, which contains: first-rate hyperfiltration of the pretreated water, through the degassing device and electric desalinization, after first-rate hyperfiltration of said pretreated water to desalt, adding acid; after decarbonation by degassing device, adding alkali; then flowing into electric desalinization instrument for fine desalinization to prepare industrial ultrapure water. According to the work characteristic of degassing film and electric desalinization instrument (EDI); using the decarbonation technique of adding acid- decarbonation- adding alkali' and strong electrolytes replacing weak electrolytes, it is convenient for deep desalinization by electric desalinization instrument.
Description
Technical field
The present invention relates to a kind of technology for preparing industrial extra-pure water, relate in particular to and a kind of first-stage reverse osmosis is produced water, after de-gassing vessel removes carbonic acid gas, produce the technology of industrial extra-pure water by electric salt remover.
Background technology
Ultrapure water is widely used in industries such as electric power, electronics, chemical industry, pharmacy.Reverse osmosis and electric salt remover (EDI) are one of flow processs of using always.Most of ion during reverse osmosis equipment can remove and anhydrate, its ratio of desalinization is generally 98%-99%.Reverse osmosis produced water carries out deep desalting by electric salt remover, and then reaches the application requiring of industrial high purity water.
Ubiquity the carbonate compound of variform in the natural water, and they are not only the important factor of decision water quality pH, and to adding acid or alkali certain shock absorption is arranged, and water quality and water treatment are had many-sided influence.
Reverse osmosis can not remove dissolved gases in the water, as carbonic acid gas etc.; Electric salt remover (EDI) is to utilize the migration of charged ion in DC electric field that water is carried out deep desalting, and the charged character of ionic has determined the complexity that this ion is removed; Strong electrolyte ions such as chlorion, sulfate ion, calcium ion, sodium ion remove easily, weak electrolyte ion relative difficult such as bicarbonate radical, and for uncharged carbonic acid, the pH variation that relies on water electrolysis to cause in EDI just can remove, and removes the difficulty maximum.Therefore, improve the product water water quality of EDI, total inorganic carbon (TIC) is low more good more in the EDI water inlet, and especially uncharged carbonic acid or carbon dioxide content are low more good more.
The technical process of adopting first-stage reverse osmosis to power up desalination device (EDI) can be saved great amount of investment, improve water inlet pH by before first-stage reverse osmosis, adding alkali, carbonic acid is converted into bicarbonate radical, can improve the clearance of reverse osmosis to bicarbonate radical, thereby reduce the load of EDI, obtain the high purity water of satisfying the demand.But when original water hardness was higher, one of direct result that improves pH was the solubility product constant that surpasses some difficulty soluble salt, as CaCO
3, MgCO
3Deng, cause reverse osmosis concentrated water side deposition, so the technology that first-stage reverse osmosis powers up desalination device (EDI) is not suitable for this class occasion.
If before first-stage reverse osmosis, add a softening installation, carry out above-mentioned processing again, can solve the scale problems that adds reverse osmosis behind the alkali, and can improve the rate of recovery of reverse osmosis, as United States Patent (USP) 6537456 B2.This device only is only applicable to less water manufacturing system; When the water yield is big, as greater than 20m
3/ h, softening salt consumption is very big, the working cost height; And in use need softening bed is handled, even switch by standby bed, also unavoidably produce leakage phenomenon, feasibility is poor.
Also have and behind first-stage reverse osmosis, establish the air blast decarbonizing tower, carry out deep desalting through electric salt remover again.But decarbonizing tower can only be reduced to 5～10ppm to gas concentration lwevel usually, and is still higher for electric salt remover, makes electric salt remover produce water purity and do not reach requirement.And airborne impurity also can be introduced secondary pollution to the EDI water inlet, influences the EDI long term operation stability.In order further to reduce in the EDI water inlet the particularly content of carbonic acid gas of total inorganic carbon (TIC), can adopt the pre-treatment of two-pass reverse osmosis as EDI.Add alkali by producing in the water, carbonic acid gas is converted into bicarbonate radical, remove with two-pass reverse osmosis again at first-stage reverse osmosis.This moment, the product water hardness of first-stage reverse osmosis was fallen very lowly, can not cause the two-pass reverse osmosis fouling after adding alkali.The technology of this class two-pass reverse osmosis is to remove one of best technical process of carbonic acid gas effect at present, but owing to increased second stage reverse osmosis, one-time investment is big, and its range of application is restricted.
Chinese patent application (01109407.9) combines the two-pass reverse osmosis and the degassing, first-stage reverse osmosis produces water after de-gassing vessel removes partial CO 2, add alkali remaining carbonic acid gas is converted into bicarbonate radical, utilize two-pass reverse osmosis efficiently to be removed, reduced like this and add alkali number.But also there are a lot of deficiencies in this technology: from degassing angle, first-stage reverse osmosis produces existing bicarbonate radical in the water, and carbonic acid gas is arranged again, and the degassing can only be removed the part of carbonic acid gas, and clearance is lower, and to not removal effect of the bicarbonate radical in the water; From producing water water quality, the product water resistance rate of this technology is usually less than 1M Ω cm, and high-duty boiler requirement 〉=5.0M Ω cm, electronic industry ultrapure water requirement 〉=15.0M Ω cm can not satisfy the industrial application requirement far away.
The present invention aims to provide a kind of new processing method, simplifies the technical process of producing industrial extra-pure water, reduces investment, enlarges the range of application that reverse osmosis and electric salt remover are produced industrial extra-pure water.
Summary of the invention
The present invention is directed to the water inlet condition that carbon dioxide content is high in the former water, the investment, the energy consumption that solve the prior art existence are big, provide a kind of single-stage reverse osmosis and electric salt remover to produce the technology of industrial extra-pure water.
Above-mentioned technical problem of the present invention is solved by following technical proposals: a kind of preparation technology of industrial extra-pure water, comprise that pretreated water is through first-stage reverse osmosis, pass through de-gassing vessel, make industrial extra-pure water by electric desalination, described pretreated water adds acid for adjusting pH value behind the elementary desalination of first-stage reverse osmosis, after removing carbonic acid gas by de-gassing vessel, add alkali once more and regulate the pH value, enter the smart desalination of electric salt remover, and make industrial extra-pure water.
Wherein, a kind of preferable technology is: a kind of preparation technology of industrial extra-pure water, after it is characterized in that former water is by the pre-treatment of pre-treatment facility, supply with the reverse osmosis membrane group by high-pressure pump, acid solution in the acid solution medicine system is added in the pretreated water, after pretreated water enters de-gassing vessel, alkaline solution medicine system alkaline solution is added in the pretreated water, send into by water pump and carry out smart desalination in the electric salt remover; Electric salt remover product water satisfies processing requirement, can deliver to through ball valve and use water spot.
Pre-treatment facility of the present invention is for guaranteeing that reverse osmosis normally moves one or more in the following facility of taking: ultrafiltration, more medium filter, activated charcoal filter, security personnel's strainer, and flocculation medicine system and scale inhibition medicine system etc.
The reverse osmosis membrane group comprises reverse osmosis membrane and off-set facility.Reverse osmosis equipment produces reverse osmosis concentrated water and reverse osmosis produced water.Reverse osmosis concentrated water can directly discharge, the usefulness of the dense water cycle of the desalination device of also can powering.De-gassing vessel comprises a kind of or whole in the following facility: porous hollow fiber, flat board or rolled membrane module.Membrane module is made by hydrophobic porous material, regulate reverse osmosis produced water behind the pH in tubular fibre inside (perhaps flat sheet membrane, rolled film one side) pass through, (perhaps flat sheet membrane, rolled film opposite side) vacuumizes in the tubular fibre outside, purging or vacuum be in conjunction with purging; Also can make reverse osmosis produced water in the tubular fibre outside (perhaps flat sheet membrane, rolled film one side) pass through, and (perhaps flat sheet membrane, rolled film opposite side) vacuumizes in tubular fibre inside, purging or vacuum be in conjunction with purging.
Usually, carbonate compound, promptly total inorganic carbon (TIC) mainly contains four kinds of different forms in water:
(1) free carbon dioxide, i.e. dissolved CO2 gas.
(2) free carbonic acid, promptly unionized H2CO3 molecule.
(3) heavy carbonic radical ion HCO
3 -, also claim half chemical combination carbonic acid.
(4) carbanion CO
3 2-, also claim chemical combination carbonic acid.
Total inorganic carbon (TIC) content just is meant the total amount of institute's carbon elements in above-mentioned four kinds of forms in the water.In fact CO in above-mentioned four kinds of compounds
2Be main component, and H
2CO
3Form only account for below 1% of molecular state total amount.And in water, exist balance (1):
In view of the principle of work of degassing film, has only CO in four kinds of forms of total inorganic carbon (TIC)
2Can be removed by degassing film.
And in the EDI assembly, be to depend on ion migration and exchange, so the CO of ionic state to removing of foreign ion
2Be more suitable for removing of EDI.And various ionic are deviate from order is different, at first is that high valence ion is deviate from, secondly be easily to deviate from ion at a low price to be deviate from, and be weak ionization ion and hydrogen ion and hydroxide ion at last.
Therefore the present invention produces water at first-stage reverse osmosis and enters before de-gassing vessel outgases, and adopts strong acid solutions such as hydrochloric acid or sulfuric acid to regulate its pH value earlier, and purpose is that above-mentioned balance (1) is moved to the left, with the HCO in the water
3 -And CO
3 2-Be converted into and help the H that degassing film removes
2CO
3It is carbonic acid gas.Through behind the de-gassing vessel, the carbon dioxide major part in the water is removed, the pH value that adopt strong base solutions such as sodium hydroxide or potassium hydroxide to regulate water once more this moment, and purpose is that above-mentioned balance (1) is moved right, with the CO in the water
2Be converted to HCO as much as possible
3 -And CO
3 2-,, thereby obtain the higher industrial extra-pure water of resistivity with the removal effect of raising EDI.
The present invention utilizes the work characteristics of degassing film, at the performance characteristics of electric salt remover (EDI), utilizes the decarbonization process of " adding acid-decarburization-Jia alkali ", replaces weak electrolyte with strong electrolyte, more helps the deep desalting of electric salt remover.
Those of ordinary skill is thought promptly added acid in reverse osmosis produced water, added alkali again, the result has increased the negatively charged ion and the cationic content of the strong electrolyte in the water, appears to the desalination load that has increased downstream EDI, this is a technology barrier, so they can not walk this mistaken ideas all the time.
The inventor once also entered into such mistaken ideas, but by the discovery that studies for a long period of time: because technology of the present invention has significantly reduced the content of carbonic acid class weak electrolyte in the EDI water inlet, be actually with the strong electrolyte that easily removes and replaced the difficult weak electrolyte that removes, even the content of strong electrolyte slightly increases, reality has also reduced the EDI influent load, has improved the product water water quality of EDI.
As preferably, described acid solution medicine system acid solution is HCl, H
2SO
4In the solution one or both.
As preferably, described alkaline solution medicine system alkaline solution is one or both in NaOH, the KOH solution, and the add-on of alkaline solution is to add 0.5-40mg in every premium on currency.
As preferably, the described pH value that enters the pretreated water of de-gassing vessel is 4-6.
Therefore, the present invention has the following advantages:
1. the present invention utilizes the work characteristics of degassing film, at the performance characteristics of electric salt remover (EDI), utilizes the decarbonization process of " adding acid-decarburization-Jia alkali ", replaces weak electrolyte with strong electrolyte, more helps the deep desalting of electric salt remover.
In reverse osmosis produced water, promptly added strong acid (for example hydrochloric acid), added highly basic (for example NaOH) again, be actually the strong electrolyte that easily removes with chlorion and sodium ion etc. and replaced the difficult weak electrolyte that removes, thereby reality has reduced the EDI influent load, has improved the product water water quality of EDI.
2. after removing most of ion, utilize decarbonization device, efficiently remove most of carbonic acid gas with reverse osmosis; Remove remaining bicarbonate radical and other residual ion through electric salt remover (EDI) again, obtain the higher industrial extra-pure water of resistivity.
3. utilize to add acid bicarbonate radical, carbonate all are converted into carbonic acid, after the degassing, total inorganic carbon (TIC) is compared with not adding acid in the water, can reduce lowlyer.
4. add alkali after the degassing, remaining uncharged carbonic acid is converted into charged bicarbonate radical or carbanion, utilize the electric field in the electric salt remover to be removed, thereby obtain the higher ultrapure water of resistivity.
5. compare with two-pass reverse osmosis+electric salt remover (EDI), invest lower.
Description of drawings
Accompanying drawing 1 is the profile of equilibrium figure of four kinds of forms of carbonate compound, and X-coordinate is the pH value, and ordinate zou is the percentage composition that exists of carbonate compound, and the pH value has determined distributional pattern.
Accompanying drawing 2 is schemas of a kind of operational path of the present invention.
1 is the pre-treatment facility among the figure, and 2 is the reverse osmosis high-pressure pump, and 3 is the electric salt remover service pump, and 4 is the reverse osmosis membrane group, and 5 is de-gassing vessel, and 6 is electric salt remover, and 7 for ultrapure water uses Ball valve of pipeline, and 8,9 are respectively acid, alkali medicine system.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: former water through 1 pre-treatment of pre-treatment facility after, through high-pressure pump 2 pressurizations, supply with reverse osmosis membrane group 4 by pipeline, remove the dissolved salts in the water, remove small-particle that some macromole and last stage do not remove etc. simultaneously.Its function is that pretreated production water is carried out pre-desalination.By hydrochloric acid medicine system 8 hydrochloric acid is joined by reverse osmosis membrane through in the pretreated water of pre-desalination, make that the pH value of pretreated water is 6, the purpose that adds hydrochloric acid is to utilize to add acid bicarbonate radical, carbonate are converted into carbonic acid, and pretreated water passes through de-gassing vessel 5 and carries out removing of carbonic acid gas.Through behind the de-gassing vessel 5, carbon dioxide major part in the water is removed, remaining water-soluble carbon dioxide is a carbonic acid, and the sodium hydroxide that is added by sodium hydroxide medicine system 9 is converted into bicarbonate radical, and the amount that adds sodium hydroxide is 0.5mg in every premium on currency; Via electric salt remover (EDI) 6, utilize that electric field is removed in the electric salt remover, thereby obtain the higher industrial extra-pure water of resistivity.Electric salt remover product water uses Ball valve of pipeline 7 to deliver to through ultrapure water and uses water spot.
Embodiment 2: former water through 1 pre-treatment of pre-treatment facility after, through high-pressure pump 2 pressurizations, supply with reverse osmosis membrane group 4 by pipeline, remove the dissolved salts in the water, remove small-particle that some macromole and last stage do not remove etc. simultaneously.Its function is that pretreated production water is carried out pre-desalination.By hydrochloric acid medicine system 8 hydrochloric acid is joined by reverse osmosis membrane through in the pretreated water of pre-desalination, make that the pH value of pretreated water is 5, the purpose that adds hydrochloric acid is to utilize to add acid bicarbonate radical, carbonate are converted into carbonic acid, and pretreated water passes through de-gassing vessel 5 and carries out removing of carbonic acid gas.Through behind the de-gassing vessel 5, carbon dioxide major part in the water is removed, remaining water-soluble carbon dioxide is a carbonic acid, and the sodium hydroxide that is added by sodium hydroxide medicine system 9 is converted into bicarbonate radical, and the amount that adds sodium hydroxide is 20mg in every premium on currency; Via electric salt remover (EDI) 6, utilize that electric field is removed in the electric salt remover, thereby obtain the higher industrial extra-pure water of resistivity.Electric salt remover product water uses Ball valve of pipeline 7 to deliver to through ultrapure water and uses water spot.
Embodiment 3: former water through 1 pre-treatment of pre-treatment facility after, through high-pressure pump 2 pressurizations, supply with reverse osmosis membrane group 4 by pipeline, remove the dissolved salts in the water, remove small-particle that some macromole and last stage do not remove etc. simultaneously.Its function is that pretreated production water is carried out pre-desalination.By hydrochloric acid medicine system 8 hydrochloric acid is joined by reverse osmosis membrane through in the pretreated water of pre-desalination, make that the pH value of pretreated water is 4, the purpose that adds hydrochloric acid is to utilize to add acid bicarbonate radical, carbonate are converted into carbonic acid, and pretreated water passes through de-gassing vessel 5 and carries out removing of carbonic acid gas.Through behind the de-gassing vessel 5, carbon dioxide major part in the water is removed, remaining water-soluble carbon dioxide is a carbonic acid, and the sodium hydroxide that is added by sodium hydroxide medicine system 9 is converted into bicarbonate radical, and the amount that adds sodium hydroxide is 40mg in every premium on currency; Via electric salt remover (EDI) 6, utilize that electric field is removed in the electric salt remover, thereby obtain the higher industrial extra-pure water of resistivity.Electric salt remover product water uses Ball valve of pipeline 7 to deliver to through ultrapure water and uses water spot.
The contrast of implementation result
Implementation result 1
Former water carries out following desalination test by electric salt remover (EDI) after the two-pass reverse osmosis system handles: regulate water inlet specific conductivity to 40 μ S/cm with analytical pure NaCl, and pH7.0, producing the water resistance rate is 17.9M Ω cm; With analytical pure NaHCO
3Regulate water inlet specific conductivity to 40 μ S/cm, pH8.5, producing the water resistance rate is 5.8M Ω cm; With analytical pure NaHCO
3Regulate water inlet specific conductivity to 40 μ S/cm, pH6.0, producing the water resistance rate is 1.7M Ω cm.
Implementation result 2
Former water is underground water, and pH7.6, bicarbonate radical content are 538mg/l, and the content of carbonic acid gas is 16.70mg/l, and specific conductivity is 872 μ S/cm; Former water carries out pre-treatment through ultrafiltration, security personnel's strainer, be 98.5% complex reverse osmosis membrane through ratio of desalinization after, producing that water power leads is 13.5 μ S/cm, pH is 5.54, bicarbonate radical content is 3.83mg/L, the content of carbonic acid gas is 17.98mg/L; Establish after reverse osmosis and add the alkali system to regulate EDI water inlet pH be 7.0, it is 16.0 μ S/cm that electricity is led, and again through the electric salt remover deep desalting, producing the water resistance rate is 10.6M Ω cm.
Implementation result 3
With implementation result 2 similarity conditions, after the degassing film processing, pH is 6.4, and the content of carbonic acid gas is 1.8mg/L, and the content of total inorganic carbon (TIC) is 1.2mg/L, and it is 12 μ S/cm that electricity is led; Establish after degassing film and add the alkali system to regulate EDI water inlet pH be 7.0, electricity is led and is become 13.2mg/L, and again through the electric salt remover deep desalting, producing the water resistance rate is 14.3M Ω cm, reaches high-duty boiler water water quality requirement.
Implementation result 4
With implementation result 2 similarity conditions, after reverse osmosis, establish and add acid system, enter degassing film after regulating pH and be 5.0, through pH behind the degassing film is 6.2, and carbon dioxide content is 1.7mg/L, and the content of total inorganic carbon (TIC) is 0.84mg/L, it is 13 μ S/cm that electricity is led, establish after degassing film and add the alkali system to regulate EDI water inlet pH be 7.0, it is 14.7 μ S/cm that electricity is led, again the product water resistance rate 17.1M Ω cm behind electric salt remover.
From contrast implementation result 1-4 result as can be known:
(1) it is easy that EDI removes strong electrolytes such as NaCl, removes HCO
3 -Difficult, remove CO
2More difficult.
(2) first-stage reverse osmosis produces water after degassing film, and again through the electric salt remover deep desalting, producing water resistance increases.
(3) add acid after reverse osmosis, make bicarbonate radical be converted into carbonic acid, again by degassing film, the decreasing ratio of total inorganic carbon (TIC) improves.
(4) before entering electric salt remover, reduce total inorganic carbon (TIC), carbonic acid gas and bicarbonate radical content are reduced, more help improving the EDI performance.
Claims (5)
1. the preparation technology of an industrial extra-pure water comprises pretreated water through first-stage reverse osmosis, by de-gassing vessel, makes industrial extra-pure water by electric desalination, and described pretreated water adds acid behind the elementary desalination of first-stage reverse osmosis; After removing carbonic acid gas by de-gassing vessel, add alkali; Enter the smart desalination of electric salt remover, and make industrial extra-pure water.
2. the preparation technology of a kind of industrial extra-pure water according to claim 1, after it is characterized in that former water is by pre-treatment facility (1) pre-treatment, supply with reverse osmosis membrane group (4) by high-pressure pump (2), acid solution in the acid solution medicine system (8) is added in the pretreated water, after pretreated water enters de-gassing vessel (5), alkaline solution medicine system (9) alkaline solution is added in the pretreated water, send in the electric salt remover (6) by water pump (3) and carry out smart desalination; Electric salt remover product water satisfies processing requirement, can deliver to through ball valve (7) and use water spot.
3. the preparation technology of a kind of industrial extra-pure water according to claim 2 is characterized in that, described acid solution medicine system (8) acid solution is HCl, H
2SO
4In the solution one or both.
4. according to the preparation technology of the described a kind of industrial extra-pure water of claim 2, it is characterized in that described alkaline solution medicine system (9) alkaline solution is one or both in NaOH, the KOH solution, the add-on of alkaline solution is to add 0.5-40mg in every premium on currency.
5. the preparation technology of a kind of industrial extra-pure water according to claim 2 is characterized in that, described with in the adding of the acid solution in the acid solution medicine system (8) pretreated water, the pH value when pretreated water enters de-gassing vessel is 4～6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100679451A CN100537456C (en) | 2004-11-05 | 2004-11-05 | Industrial ultrapure water preparation process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100679451A CN100537456C (en) | 2004-11-05 | 2004-11-05 | Industrial ultrapure water preparation process |
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| Publication Number | Publication Date |
|---|---|
| CN1769217A true CN1769217A (en) | 2006-05-10 |
| CN100537456C CN100537456C (en) | 2009-09-09 |
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ID=36750812
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101108762B (en) * | 2006-07-19 | 2011-12-14 | 深圳市海川实业股份有限公司 | Process technique for pharmacy wastewater |
| CN103405945A (en) * | 2013-07-31 | 2013-11-27 | 中科华核电技术研究院有限公司 | Degasser for removing dissolved gases in reactor coolant of nuclear power station, and method thereof |
| CN104229942A (en) * | 2014-10-11 | 2014-12-24 | 南京中电环保股份有限公司 | Method and device for decarbonizing and desalting liquid |
| CN104271210A (en) * | 2012-02-20 | 2015-01-07 | Ccr科技有限公司 | Process for removing salts from a processing liquid |
| CN110487851A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of measuring system and method for the hydrogen conductivity that deaerates |
| CN110981060A (en) * | 2019-12-10 | 2020-04-10 | 湖南中伟新能源科技有限公司 | Ammonium chloride double-effect plate type rising film concentration evaporation process and system thereof |
| CN112340872A (en) * | 2020-09-29 | 2021-02-09 | 中核四0四有限公司 | Method for improving alkalinity removal effect of single-stage reverse osmosis desalination process |
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| JP6569731B2 (en) * | 2015-04-13 | 2019-09-04 | Dic株式会社 | Specific resistance value adjusting device and specific resistance value adjusting method |
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- 2004-11-05 CN CNB2004100679451A patent/CN100537456C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101108762B (en) * | 2006-07-19 | 2011-12-14 | 深圳市海川实业股份有限公司 | Process technique for pharmacy wastewater |
| CN104271210A (en) * | 2012-02-20 | 2015-01-07 | Ccr科技有限公司 | Process for removing salts from a processing liquid |
| CN104271210B (en) * | 2012-02-20 | 2018-01-09 | Ccr科技有限公司 | Method for removing salt from treatment fluid |
| CN103405945A (en) * | 2013-07-31 | 2013-11-27 | 中科华核电技术研究院有限公司 | Degasser for removing dissolved gases in reactor coolant of nuclear power station, and method thereof |
| CN103405945B (en) * | 2013-07-31 | 2016-02-10 | 中科华核电技术研究院有限公司 | Remove degasser and the method thereof of dissolved gas in nuclear power plant reactor cooling agent |
| CN104229942A (en) * | 2014-10-11 | 2014-12-24 | 南京中电环保股份有限公司 | Method and device for decarbonizing and desalting liquid |
| CN104229942B (en) * | 2014-10-11 | 2017-02-22 | 南京中电环保股份有限公司 | Method and device for decarbonizing and desalting liquid |
| CN110487851A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of measuring system and method for the hydrogen conductivity that deaerates |
| CN110981060A (en) * | 2019-12-10 | 2020-04-10 | 湖南中伟新能源科技有限公司 | Ammonium chloride double-effect plate type rising film concentration evaporation process and system thereof |
| CN112340872A (en) * | 2020-09-29 | 2021-02-09 | 中核四0四有限公司 | Method for improving alkalinity removal effect of single-stage reverse osmosis desalination process |
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| Publication number | Publication date |
|---|---|
| CN100537456C (en) | 2009-09-09 |
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