CN107758815A - The technique that a kind of alkylphosphonate and its aqueous metal salt prepare inorganic phosphate and correspondent alcohol - Google Patents
The technique that a kind of alkylphosphonate and its aqueous metal salt prepare inorganic phosphate and correspondent alcohol Download PDFInfo
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- CN107758815A CN107758815A CN201610677703.7A CN201610677703A CN107758815A CN 107758815 A CN107758815 A CN 107758815A CN 201610677703 A CN201610677703 A CN 201610677703A CN 107758815 A CN107758815 A CN 107758815A
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- alkylphosphonate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
- C01B25/305—Preparation from phosphorus-containing compounds by alkaline treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/02—Monohydroxylic acyclic alcohols
- C07C31/08—Ethanol
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
Abstract
The invention discloses the technique that a kind of alkylphosphonate and its aqueous metal salt prepare inorganic phosphate and correspondent alcohol.Organic phosphorus compound belongs to recalcitrant substance, current domestic and international universal process method：Wet oxidation process, photochemical catalytic oxidation, Fenton reagent method, Ozonation, absorption method, Hydrolyze method etc., then pass through Biochemical method again.The present invention obtains inorganic phosphate and correspondent alcohol with highly basic using alkylphosphonate and its metallic salt aqueous solution through pyroreaction, correspondent alcohol is separated in pressure leak process after completion of the reaction, obtain inorganic phosphate crude product solution, pH value is adjusted through acid or alkali again, recrystallization, subsequent treatment obtain the phosphate fine work of the different crystallizations water respectively.The present invention is applied to alkylphosphonate caused by phosphorous technique and its metal salt wastewater treatment, and products obtained therefrom purity is high, reaches technical grade standard, concise in technology, industrialization easily realization, and waste water COD degradation rate is up to more than 97%, the great value of environmental protection and economic value.
Description
Technical field
The present invention relates to one kind using alkylphosphonate and its aqueous metal salt as raw material, obtained with highly basic through pyroreaction
The inorganic phosphate fine work of the high-purity difference crystallization water and the friendly process of correspondent alcohol.
Background technology
In the late two decades.People are in the ascendant to the interest of organophosphorus chemistry, achieve many new achievements again, especially
The spatial chemistry and organophosphor heterocyclic chemistry of organic phosphorus compound, research it is very more.The compound of the various ligancies of phosphorus from
The C.N.6 of C.N.1 mono- have obtained rock-steady structure, and therefore, organophosphorus chemistry occupies quite important in multiple chemical fields at present
Position.In terms of importance such as in stereochemical structure, type of compounds and biochemistry, or even can carburet thing phase
That matches in excellence or beauty thus turns into an independent subject.
The generally following several trend of phosphorous chemical industry development：Fertilizer has changed into efficient compound fertilizer from single poorly efficient fertilizer, and just
Develop to efficient, highly concentrated, multi-component composite fertilizer, compoiste fertilizer, biological compound fertilizer, fine fertilizer direction；Fine chemical product is then
Mainly to food, beverage, feed, detergent, biomaterial, electric, ceramic, enamel, coating, building materials and other are special
Material, functional material direction are developed.
Wittig-Horner reactions are to replace the phosphorus ylide obtained by triphenylphosphine to be made with aldehyde ketone reaction with phosphite ester
The very valuable synthetic method of standby alkene, for directly synthesizing alkene from aldehyde, ketone, the reaction yield is higher, has height
Regioselectivity.Wittig-Horner is reacted compared with traditional Wittig reactions with advantages below：(1) PO reagents
Carbonyl anion there is stronger nucleophilicity compared with phosphonium ylide, it is easier to reacted with carbonyls, and reaction condition temperature
With it is insensitive to external condition.(2) in the operation that traditional Wittig reacts, Product olefins and phosphine oxide are not easily separate.
And in Wittig-Horner reactions obtained by phosphinic acids or phosphonic acids anion be all dissolved in water, easily and separation of olefins.(3) phosphine leaf
The tertiary phosphine of vertical moral needs costly is as initiation material, and phosphonate ester then can use comparatively cheap reagent, preparation method
It is easy.(4) classical Wittig reactions often can obtain the product based on Z bodies under given conditions, and Wittig-Horner is anti-
The product based on E bodies should be obtained in most instances.Using very extensive, such as the preparation of vitamin A and beta carotene etc..
But a large amount of organism P wastewaters are produced in its preparation process, main component is diethyl phosphate sodium.
Organic phosphorus compound belongs to recalcitrant substance, current domestic and international universal process method：Wet oxidation process, light are urged
Change oxidation, Fenton reagent method, Ozonation, absorption method, Hydrolyze method etc., then pass through Biochemical method again.
First, wet oxidation process
Wet Oxidation Process (Wet air oxidation) abbreviation WAO or WO), it is the one kind to grow up the 1950s
Handle poisonous, harmful, high concentrated organic wastewater effective ways.It is needed in high temperature (150-300 DEG C) and high pressure (1-10MPa)
Lower operation, high energy consumption, equipment and materials require high temperature resistant, high pressure and corrosion-resistant, and cost of equipment is big, and complex operation, system are once
Property investment it is big, practical engineering application is restricted.
2nd, photochemical catalytic oxidation
Photochemical catalytic oxidation is the side of catalyzing organic oxidation and degraded under illumination condition using photosensitizer semiconductor as catalyst
Method.Photocatalysis oxidation technique starts from late 1970s, and currently used method has traditional TiO2- UV methods and improved
H2O2- UV, O3- UV etc..Photocatalysis produces the extremely strong hydroxyl radical free radical of oxidisability, can oxidative degradation organic matter, be converted into it
CO2, H2O and inorganic matter, degradation speed is fast, non-secondary pollution.At present, photochemical catalytic oxidation fado is with the ultraviolet spoke of artificial light source
It is costly although it is to decomposing organic matter significant effect based on penetrating, and need to consume electric energy larger；Waste water quality simultaneously
Very big, processing cost increase is influenceed on treatment effect, and equipment is relatively complicated.
3rd, Fenton reagent method
Subsequent treatment need to be carried out to reclaim catalyst, cost recovery is high, flow is complicated, easily causes secondary pollution problems, these
Problem constrains the development of Fenton methods.
4th, Ozonation
Ozonation as agricultural chemicals waste water pretreating process when handling poisonous, hardly degraded organic substance it is highly effective, in waste water
Many pesticide organic pollutions can be reacted rapidly with ozone, Ozonation is only used for the purified treatment mistake of micropollution water
Journey.
5th, absorption method
Absorption method is mainly the suction-operated by adsorbent, removes the pollutant in agricultural chemicals waste water.Conventional adsorbent has work
Property charcoal and polymeric adsorbent.Activated carbon is mainly using organic in its loose structure and larger specific surface area absorption agricultural chemicals waste water
Thing, there is good adsorption effect to agricultural chemicals waste water, the waste water after adsorption treatment can be down to by the level of biological oxidation.
6th, Hydrolyze method
Hydrolyze method is generally used to handle the agricultural chemicals waste water containing thiophosphate and phosphate, typically divides acidic hydrolysis and alkaline water
Solution.In acid condition, particularly in strong basicity or higher temperature, phosphate complete hydrolysis is parent phosphoric acid and alcohol or phenol,
But under neutral or basic conditions, hydrolysis stops at the phosphoric acid dibasic ester stage, this is due to di-phosphate ester and phosphate monoester
Alkalescence shows inertia, it is, in general, that the more non-halophosphate of halophosphate is susceptible to hydrolysis, in halophosphate hydrolytic process, phosphorus halogen
Key is preferentially broken.
Phosphate purposes is very extensive, is used for example as water softener, fabric weighting agent, fireproof agent, and for glaze, welding agent,
Medicine, pigment, food industry and produce other phosphate as industrial water quality treatment agent, printing and dyeing detergent, quality improver, in
With agent, antibiotic nutrient chemical, biochemical treatment agent, food quality modifying agent.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming above-mentioned prior art to exist, there is provided a kind of by phosphoric acid alkane
Base ester and its aqueous metal salt are converted into the method for the phosphate fine work and correspondent alcohol of the high-purity difference crystallization water, great environmental protection
Value and social benefit.
Therefore, the present invention adopts the following technical scheme that：A kind of alkylphosphonate and its aqueous metal salt prepare inorganic
The technique of phosphate and correspondent alcohol, it is characterised in that with containing C1-6The alkylphosphonate and its metal of straight or branched alkyl group
Saline solution is raw material, obtains inorganic phosphate and correspondent alcohol through pyroreaction with highly basic, reaction temperature is 160-260 DEG C, pressure
Power is 1.0-5.0MPa, and the reaction time is 2-5 hours, separates correspondent alcohol in pressure leak process after completion of the reaction, obtains Phos
Hydrochlorate crude product solution, then pH value is adjusted through acid or alkali, recrystallize respectively, post processing obtains the inorganic phosphate essence of the different crystallizations water
Product, such as phosphoric acid hydrogen disalt or tricresyl phosphate salt.
The isolated alcohol of the present invention can reach technical grade specification by post processing, as ethanol can be obtained by rectifying
More than 95% product.
As further improving and supplementing to above-mentioned technical proposal, the present invention uses following technical measures：
Described alkylphosphonate is phosphotriester, di-phosphate ester or phosphate monoester, C1-6Straight or branched alkyl group is first
Base, ethyl, propyl group or butyl.
Described metal salt is sylvite or sodium salt.
Described highly basic is the sodium hydroxide or hydroxide of sodium hydroxide or potassium hydroxide, most preferably mass concentration 30%
Potassium.
The mol ratio of described highly basic and alkylphosphonate and its metal salt is preferably 1.2-3:1, most preferably 1.2:1；
The mass concentration of alkylphosphonate and its aqueous metal salt is preferably 25-60%, most preferably 40-45%.
Reaction temperature is preferably 230-250 DEG C, and pressure is preferably 3.0-4.5MPa.
The acid adjusted used in pH value is phosphoric acid or sodium dihydrogen phosphate, and the mass concentration of phosphoric acid is preferably 85%；Alkali used is hydrogen
Sodium oxide molybdena or potassium hydroxide, the mass concentration of alkali is preferably 30~50%.
During adjusting pH value, temperature is preferably 60-80 DEG C, most preferably 65-75 DEG C；PH value is 8.0-9.2, most preferably
For 8.8-9.0；The temperature of recrystallization is preferably 0-40 DEG C, most preferably 10-20 DEG C；Crystallization time is preferably 1-6 hours, optimal
Elect 2-3 hours as.
Described alkylphosphonate and its aqueous metal salt can be that alkylphosphonate and its metal salt and water are formed
Solution, or waste water solution caused by all phosphorous techniques, as Wittig-Horner reaction caused by alkylphosphonate and
Its metal salt waste water.
Apply the present invention in alkylphosphonate caused by phosphorous technique and its metal salt wastewater recovery processing technique, have
Have the advantage that：The phosphate fine work and correspondent alcohol product purity of the different crystallizations water of gained are high, reach technical grade standard, give up
Water COD degradation rate is up to more than 97%, and handling process is succinct, industrializes and easily realizes, the great value of environmental protection and economic value.
With reference to embodiment, the invention will be further described.
Embodiment
The analytical instrument and equipment used in embodiment：Gas chromatograph：Shanghai day U.S. 7890F；Moisture determination instrument：Mei Te
Le-support benefit V20 moisture content titrators；X-ray diffractometer：Shimadzu XRD-6100.
Embodiment 1：In the 1000ml autoclaves equipped with mechanical agitation and thermometer, 200g di(2-ethylhexyl)phosphates are separately added into
Ethyl ester sodium (1.19mol), 250ml water and 57.2gNaOH（1.43mol）, react 3 hours at 230 DEG C, then separated second
Alcohol, atmospheric distillation obtain ethanol 101g, G.C content：99.2%, moisture：4.8%, then by disodium hydrogen phosphate crude product solution phosphoric acid
Regulation pH value obtains 403.7g Na2HPO4.12H2O fine work to be incubated 2 hours at 8.5,10 DEG C and crystallize, and presses
GB25568-2010 standard detection Na2HPO4.12H2O contents：97.8%.
Embodiment 2：In the 1000ml autoclaves equipped with mechanical agitation and thermometer, 400g di(2-ethylhexyl)phosphates are separately added into
Ethyl ester sodium waste water（Phosphorous diethyl phthalate sodium 44.0%）、48g NaOH（1.20mol）, reacted at 250 DEG C 3 hours, then distillation point
Ethanol is separated out, rectification under vacuum obtains 89.5g ethanol, G.C contents：99.0%, moisture：4.9%, disodium hydrogen phosphate crude product solution is used
Phosphorus acid for adjusting pH value obtains 336.9g Na2HPO4.12H2O fine work to 8.5,10 DEG C of crystallizations, is marked by GB25568-2010
Quasi- detection Na2HPO4.12H2O content：97.5%.
Embodiment 3：Reaction under high pressure temperature is increased to 250 DEG C, and for other conditions with embodiment 1, rectifying obtains 103.6g ethanol,
G.C contents：99.3%, moisture：4.7%, crystallization obtains 409.5g Na2HPO4.12H2O fine work, by GB25568-2010
Standard detection Na2HPO4.12H2O content：97.6%.
Embodiment 4：Reaction under high pressure temperature is reduced to 200 DEG C, and for other conditions with embodiment 1, rectifying obtains 93.0g ethanol,
G.C contents：99.1%, moisture：4.8%, crystallization obtains 385g Na2HPO4.12H2O fine work, is marked by GB25568-2010
Quasi- detection Na2HPO4.12H2O content：97.2%.
Embodiment 5：35gNaOH is added in pyroreaction, for other conditions with embodiment 2, rectifying obtains 76g ethanol, and G.C contains
Amount：99.3%, moisture：4.9%, crystallization obtains 305g Na2HPO4.12H2O fine work, is examined by GB25568-2010 standards
Survey Na2HPO4.12H2O content：97.5%.
Embodiment 6：Pyroreaction adds 80gNaOH, and for other conditions with embodiment 2, rectifying obtains 77g ethanol, and G.C contains
Amount：99.2%, moisture：4.8%, tertiary sodium phosphate crude product adjusts pH value to 12.0, and crystallization obtains the crystallization water tertiary sodium phosphates of 303g 12
Fine work, by HG/T2517-93 standard detection phosphate hydrogen tri-sodium contents：97.6%.
Embodiment 7：1 hour pyroreaction time, for other conditions with embodiment 2, rectifying obtains 82.2g ethanol, and G.C contains
Amount：99.4%, moisture：4.8%, crystallization obtains 316.5g Na2HPO4.12H2O fine work, by GB25568-2010 standards
Detect Na2HPO4.12H2O content：97.1%.
Embodiment 8：By disodium phosphate soln phosphorus acid for adjusting pH value to 9.0, with embodiment 2, rectifying obtains other conditions
To 89g ethanol, G.C contents：99.0%, moisture：4.9%, crystallization obtains 318.5g Na2HPO4.12H2O fine work, presses
GB25568-2010 standard detection Na2HPO4.12H2O contents：97.0%.
Embodiment 9：60gNaOH is added in pyroreaction, for other conditions with embodiment 2, rectifying obtains 91.2g ethanol, G.C
Content：99.4%, moisture：4.5%, crystallization obtains 339.5g Na2HPO4.12H2O fine work, is marked by GB25568-2010
Quasi- detection Na2HPO4.12H2O content：97.3%.
Embodiment 10：Crystallization temperature brings up to 20 DEG C, and for other conditions with embodiment 2, rectifying obtains 90.2g ethanol, and G.C contains
Amount：99.3%, moisture：4.7%, crystallization obtains 329.5g Na2HPO4.12H2O fine work, by GB25568-2010 standards
Detect Na2HPO4.12H2O content：97.2%.
Embodiment 11：In the 1000ml autoclaves equipped with mechanical agitation and thermometer, 250g phosphoric acid is separately added into
Dibutyl ester potassium（1mol）, 250ml water and 70gKOH（1.45mol）, reacted 3 hours at 250 DEG C, then separated goes out butanol,
Rectification under vacuum obtains 139g butanol, G.C contents：99.1%, moisture：0.05%, dipotassium hydrogen phosphate crude product solution is adjusted with phosphoric acid
PH value obtains the crystallization water dipotassium hydrogen phosphates of 210g tri- to 8.7,10 DEG C of crystallizations, and three knots are detected by the black Q/HG 1149-85 of company standard
Brilliant water dipotassium hydrogen phosphate content：96.9%.
Embodiment 12：Pyroreaction adds 105g KOH（1.09mol）, other conditions are with embodiment 10, then 10 DEG C of knots
Crystalline substance obtains 206g tripotassium phosphates, and tripotassium phosphate content is detected by the black Q/HG 1149-85 of company standard：96.9%.
Embodiment 13：In the 1000ml autoclaves equipped with mechanical agitation and thermometer, 190g phosphoric acid is separately added into
Triethyl（1.02mol）, 200g water and 120gNaOH（3mol）, reacted 3 hours at 250 DEG C, then separated goes out ethanol, subtracts
Pressure rectifying obtains 131g ethanol, G.C contents：99.0%, moisture：4.05%, by tertiary sodium phosphate crude product solution phosphorus acid for adjusting pH value
559.7g Na2HPO4.12H2O fine work is obtained to 8.5,10 DEG C of crystallizations, by the knot of GB25568-2010 standard detections 12
Brilliant water disodium hydrogen phosphate content：97.6%.
Claims (10)
- A kind of 1. technique that alkylphosphonate and its aqueous metal salt prepare inorganic phosphate and correspondent alcohol, it is characterised in that With containing C1-6The alkylphosphonate and its aqueous metal salt of straight or branched alkyl group are raw material, with highly basic through pyroreaction Inorganic phosphate and correspondent alcohol are obtained, reaction temperature is 160-260 DEG C, pressure 1.0-5.0MPa, and the reaction time is that 2-5 is small When, correspondent alcohol is separated in pressure leak process after completion of the reaction, obtains inorganic phosphate crude product solution, then pH is adjusted through acid or alkali Value, recrystallize respectively, post processing obtains the inorganic phosphate fine work of the different crystallizations water.
- 2. technique according to claim 1, it is characterised in that described alkylphosphonate is phosphotriester, di-phosphate ester Or phosphate monoester, C1-6Straight or branched alkyl group is methyl, ethyl, propyl group or butyl.
- 3. technique according to claim 1, it is characterised in that described metal salt is sylvite or sodium salt.
- 4. technique according to claim 1, it is characterised in that described highly basic is sodium hydroxide or potassium hydroxide.
- 5. according to the technique described in claim any one of 1-4, it is characterised in that described highly basic and alkylphosphonate and its gold The mol ratio for belonging to salt is 1.2-3:1, the mass concentration of alkylphosphonate and its aqueous metal salt is 25-60%.
- 6. technique according to claim 5, it is characterised in that described highly basic and alkylphosphonate and its metal salt rub Your proportioning is 1.2:1, the mass concentration of alkylphosphonate and its aqueous metal salt is 40-45%.
- 7. technique according to claim 1 or 2, it is characterised in that reaction temperature is 230-250 DEG C, pressure 3.0- 4.5MPa。
- 8. technique according to claim 1 or 2, it is characterised in that the acid used in regulation pH value is phosphoric acid or biphosphate Sodium, alkali used are sodium hydroxide or potassium hydroxide.
- 9. technique according to claim 1 or 2, it is characterised in that during regulation pH value, temperature is 60-80 DEG C, pH value For 8.0-9.2；The temperature of recrystallization is 0-40 DEG C, and crystallization time is 1-6 hours.
- 10. technique according to claim 9, it is characterised in that during regulation pH value, temperature is 65-75 DEG C, and pH value is 8.8-9.0；The temperature of recrystallization is 10-20 DEG C, and crystallization time is 2-3 hours.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100012887A (en) * | 2007-03-08 | 2010-02-08 | 정인 | Struvite crystalization method for removal of phosphorus and/or nitrogen |
| CN101948197A (en) * | 2010-09-27 | 2011-01-19 | 中国环境科学研究院 | Method for treating high-concentration phosphonomycin pharmaceutical wastewater and reclaiming phosphorus |
| CN103043834A (en) * | 2012-12-27 | 2013-04-17 | 北京博瑞赛科技有限责任公司 | Rear earth smelting wastewater treatment process |
| CN103964622A (en) * | 2013-02-05 | 2014-08-06 | 江苏优士化学有限公司 | Comprehensive treatment and resource utilization method for industrial organic phosphorus waste liquid |
-
2016
- 2016-08-17 CN CN201610677703.7A patent/CN107758815A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100012887A (en) * | 2007-03-08 | 2010-02-08 | 정인 | Struvite crystalization method for removal of phosphorus and/or nitrogen |
| CN101948197A (en) * | 2010-09-27 | 2011-01-19 | 中国环境科学研究院 | Method for treating high-concentration phosphonomycin pharmaceutical wastewater and reclaiming phosphorus |
| CN103043834A (en) * | 2012-12-27 | 2013-04-17 | 北京博瑞赛科技有限责任公司 | Rear earth smelting wastewater treatment process |
| CN103964622A (en) * | 2013-02-05 | 2014-08-06 | 江苏优士化学有限公司 | Comprehensive treatment and resource utilization method for industrial organic phosphorus waste liquid |
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Application publication date: 20180306 |