CN103464225B - Recovery method of polluted anion exchange resin - Google Patents
Recovery method of polluted anion exchange resin Download PDFInfo
- Publication number
- CN103464225B CN103464225B CN201310432026.9A CN201310432026A CN103464225B CN 103464225 B CN103464225 B CN 103464225B CN 201310432026 A CN201310432026 A CN 201310432026A CN 103464225 B CN103464225 B CN 103464225B
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- CN
- China
- Prior art keywords
- exchange resin
- anion exchange
- pollutant
- resin
- polluted
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- Treatment Of Water By Ion Exchange (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a recovery method of polluted anion exchange resin. The recovery method is characterized by comprising the following steps: scrubbing a pollutant in the anion exchange resin through adopting layered bimetal or polymetal hydrate suspending liquid, so as to enable the pollutant to be subjected to diversion exchange and adsorption, wherein the molar ratio of a divalent metal positive ion M<2+> in the layered bimetal or polymetal hydrate suspending liquid to a trivalent metal cation M<3+> is X to 1, and the X value is within1-4. The layered bimetal or a polymetal hydrate suspending substance used in the method is easy to recover and recycle or continuously use, and the environment cost is reduced; the diversion exchange and adsorption of the pollutant in the method refers to an irreversible process from a solid phase to a solid phase under a sufficient expansion environment of the resin, the recovery method has the advantages that multiple substances of the polluted resin are cleaned, the recovery effect is relatively good, the application range is relatively wide, and the like, and a new way for recovering the polluted anion exchange resin is developed.
Description
Technical field
The present invention relates to absorption and switching technology field, specifically a kind of method for resuscitation that pollutes anion exchange resin, the irreversible transfer that relates in particular to pollutant and be from solid phase to solid phase is changed and the method for adsorbing.
Background technology
Strong-base anion-exchange resin is a kind of polystyrene gel type strong base resin, because its stable chemical nature, satisfactory mechanical property, is widely used in the industrial process such as pure water preparation, syrup decolorization.One of major defect of this resin be easy to contaminated, because this resin is extremely strong to organic adsorption capacities such as humic acids, the electrostatic attraction of existing quaternary ammonium group to humic acid, there is again the extremely strong molecular attraction of styrene skeleton to it, down to it being replaced out with general regenerative agent, be called organic contamination.Ion exchange resin surface is by silicon and compound covers or the exchange duct of resin is blocked, and operating capacity is obviously reduced, and affects operating cost, is called silicon and pollutes.In addition, iron, aluminium plasma also tend to form complex ion, association with humic acid etc. is organic, and formation comprehensive pollution flocks together.Result significantly deepens color of resin, and operating capacity declines, and water economy and environment cost processed increases.
For eliminating or alleviating above-mentioned phenomenon, produce the method for resuscitation of many pollution anion exchange resin.Wherein, for the saline and alkaline resuscitation fluid (NaCl+NaOH) of organic contamination resin exploitation, be the effect of high exchange potential chloride ions displace on the one hand, be high ionic strength resuscitation fluid diminishes organic pollutant structure on the other hand, weaken the adhesion of itself and resin matrix; And the exchange equilibrium of OH-and Cl-makes by the continuous swelling contraction of recovery resin, produce internal stress and make organic pollutant depart from skeleton and increase to the power of external diffusion.Adopt hot alkali dipping mode to recover to being subject to silicon to pollute anion exchange resin.
There is following problem in existing method for resuscitation:
1, resuscitation fluid formula is developed for specific pollutants, there is no the practical approach that adapts to the one step recovery of mixed type pollution anion exchange resin.
2, the process that makes pollutant transfer to liquid phase from resin solid phase by mechanism such as exchange, dissolving, dispersions is reversible, and therefore recovery degree (effect) is restricted by balance.The disposable use of resuscitation fluid, increase discharge load.
3, proceed to high ionic strength resuscitation fluid from application form (fully swelling), by recovery anion exchange resin, because transition and dehydration swellbility decline, steric restriction becomes pollutant transfers to the bottleneck of liquid phase process from resin solid phase.Recovery shows as CEC and recovers to improve lower than operating capacity, is that the larger pollutant of some volumes is failed the cause of removal.
Summary of the invention
According to the technical problem of above-mentioned proposition, and provide a kind of method for resuscitation that pollutes anion exchange resin.
The technological means that the present invention adopts is as follows:
A method for resuscitation that pollutes anion exchange resin, is characterized in that: adopt layered bi-metal or many metal hydroxides suspension to clean the pollutant in anion exchange resin, make pollutant that exchange and absorption occur to shift; Divalent metal M in layered bimetallic or many metal hydroxides suspension
2+with trivalent metal cation M
3+mol ratio be X:1, wherein the value of X gets 1～4.
As preferably, described divalent metal M
2+for Mg
2+, Zn
2+and Cu
2+; Described trivalent metal cation M
3+for Al
3+and Fe
3+.
As preferably, described pollutant is electronegative organic matter, complexing and polymerization anion and the anion that produces by hydrolysis.
Transfer exchange in the present invention is the irreversible procedure from solid phase to solid phase under resin fully expands environment with absorption, and a step is removed the many kinds of substance that pollutes resin.In the present invention scouring process (as shown in Figure 1) pollutant occur shift exchange with absorption mechanism schematically as follows (taking double-metal hydroxide suspension as example, wherein divalent metal M
2+for Mg
2+, trivalent metal cation M
3+for Al
3+):
Mg
6Al
2(OH)
16(OH)
2+CO
3 2-→Mg
6Al
2(OH)
16CO
3+2OH
- [1]
{RN(CH
3)
3}
2A+2OH
-→2RN(CH
3)
3OH+2A
2- [2]
Mg
6Al
2(OH)
16CO
3+A
2-→Mg
6Al
2(OH)
16A+CO
3 2- [3]
A in formula
2-represent electronegative organic matter, complexing and polymerization anion and the anion producing by hydrolysis.
The Mg generating in recovery process
6al
2(OH)
16a is suspended particulate substance, is easy to backwash removing and recycling use or sustainable utilization, reduces Environmental costs; As shown in Figure 2, can be by pure water to Mg
6al
2(OH)
16a cleans, then for subsequent use after sedimentation, dry, roasting.
Compared with prior art, the present invention has the following advantages:
1, a step is removed the many kinds of substance that pollutes anion exchange resin, comprises electronegative organic matter, complexing and polymerization anion and the anion producing by hydrolysis.The irreversible transfer of pollutant is changed with absorption and is made resuscitation effect better, and the scope of application is more extensive.
2, the transfer of pollutant from solid phase to solid phase, after using, resuscitation fluid is easy to recycling use or sustainable utilization, reduces Environmental costs.
3, ultralow ionic strength and high swelling exchange ion make to be expanded by recovery resin, avoid shrinking the pollutant migration spatial obstacle, the i.e. mechanical damage that cause.
The present invention can extensively promote in absorption and switching technology field for the foregoing reasons.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is that the present invention pollutes Anion-exchange Resin Recovering method scouring schematic diagram.
Fig. 2 is that the present invention uses rear resuscitation fluid to reclaim and recycle schematic diagram.
Detailed description of the invention
50mL is polluted to anion exchange resin and a certain amount of homemade Mg (OH)
2and Al (OH)
3(Mg
2+and Al
3+mol ratio is 3:1, and pretreatment makes its electrical conductivity <100 μ s/cm) double-metal hydroxide suspension imports in ion exchange column, pneumatic stirring certain hour, afterwards separation resin and suspension.Separately get a 50mL and pollute anion exchange resin (being the anion exchange resin polluting before recovery), carry out parallel regeneration tests (NaOH consumption is 1.2 times of anion exchange resin theoretical work exchange capacity, and volume is 2-3 times of anion exchange resin volume) with the negative resin after recovery.Adopt afterwards the mode of acid base titration to measure operating capacity.Result is as follows: the operating capacity of the anion exchange resin polluting before recovery is that 1.5718mmol/g(is dry); After recovery, the operating capacity of anion exchange resin is that 1.6819mmol/g(is dry), operating capacity rises 7.0%.
Above-mentioned reacted suspension is dry, in 450 DEG C of Muffle furnace calcinings, make it by Mg
6al
2(OH)
16a is converted into MgO and Al
2o
3bimetallic oxide, pollutes anion exchange resin by this bimetallic oxide, a certain amount of deionized water and 50mL and imports in ion exchange column, according to above-mentioned steps, recovers to polluting anion exchange resin.Result is as follows: the operating capacity of the anion exchange resin after recovery is that 1.7253mmol/g(is dry), operating capacity rises 9.8%.Result shows: bimetallic oxide enters water body, can again be converted into Mg
6al
2(OH)
16(OH)
2, recycle.
The above; it is only preferably detailed description of the invention of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a method for resuscitation that pollutes anion exchange resin, is characterized in that: adopt layered bi-metal or many metal hydroxides suspension to clean the pollutant in anion exchange resin, make pollutant that exchange and absorption occur to shift; Divalent metal M in layered bimetallic or many metal hydroxides suspension
2+with trivalent metal cation M
3+mol ratio be X:1, wherein X value is 1 ~ 4, described divalent metal M
2+for Mg
2+, described trivalent metal cation M
3+for Al
3+; Described pollutant is electronegative organic matter, complexing and polymerization anion and the anion that produces by hydrolysis, and concrete recovery step is as follows:
A. 50mL is polluted to anion exchange resin and homemade Mg/Al double-metal hydroxide suspension and import in ion exchange column, separation resin and suspension after pneumatic stirring, then adopt the mode of acid base titration to measure its operating capacity;
B. above-mentioned reacted suspension is dried and is calcined, make it by Mg
6al
2(OH)
16a is converted into Mg/Al bimetallic oxide, this bimetallic oxide is continued to 50mL is polluted to anion exchange resin and recover.
2. a kind of method for resuscitation that pollutes anion exchange resin according to claim 1, is characterized in that: described divalent metal M
2+can also be Zn
2+or Cu
2+; Described trivalent metal cation M
3+can also be Fe
3+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432026.9A CN103464225B (en) | 2013-09-14 | 2013-09-14 | Recovery method of polluted anion exchange resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432026.9A CN103464225B (en) | 2013-09-14 | 2013-09-14 | Recovery method of polluted anion exchange resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103464225A CN103464225A (en) | 2013-12-25 |
| CN103464225B true CN103464225B (en) | 2014-12-10 |
Family
ID=49789396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310432026.9A Expired - Fee Related CN103464225B (en) | 2013-09-14 | 2013-09-14 | Recovery method of polluted anion exchange resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103464225B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070093399A1 (en) * | 2005-10-26 | 2007-04-26 | Selective Micro Technologies, Llc | Cleaning, sanitization and regeneration of chromatography media using chlorine dioxide |
| CN1994888B (en) * | 2007-01-12 | 2010-05-19 | 北京化工大学 | Cleaning preparation method of sheet-like composite oxide powder |
| CN101861206A (en) * | 2007-11-20 | 2010-10-13 | 日本国土开发株式会社 | Method for replacing interlayer ions of hydrotalcite-like substance, regenerating method, and apparatus for replacing interlayer ions |
| CN102502913A (en) * | 2011-11-03 | 2012-06-20 | 同济大学 | Method for removing anion pollutants from water |
| CN102631955B (en) * | 2012-05-04 | 2014-04-23 | 哈尔滨工业大学 | Restoration method for removing iron pollution of anion exchange resin and restoration drug formula |
-
2013
- 2013-09-14 CN CN201310432026.9A patent/CN103464225B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103464225A (en) | 2013-12-25 |
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Granted publication date: 20141210 Termination date: 20170914 |
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