CN101323443A - Reclaiming circulation method of polybasic acid inorganic salt solution - Google Patents
Reclaiming circulation method of polybasic acid inorganic salt solution Download PDFInfo
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- CN101323443A CN101323443A CNA2008100509834A CN200810050983A CN101323443A CN 101323443 A CN101323443 A CN 101323443A CN A2008100509834 A CNA2008100509834 A CN A2008100509834A CN 200810050983 A CN200810050983 A CN 200810050983A CN 101323443 A CN101323443 A CN 101323443A
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- phosphoric acid
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- 229910017053 inorganic salt Inorganic materials 0.000 title claims abstract description 44
- 239000012266 salt solution Substances 0.000 title claims abstract description 24
- 150000007519 polyprotic acids Polymers 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 32
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 20
- 235000010755 mineral Nutrition 0.000 claims description 20
- 239000011707 mineral Substances 0.000 claims description 20
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-M dihydrogenphosphate Chemical compound OP(O)([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-M 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 9
- 239000012047 saturated solution Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 235000015320 potassium carbonate Nutrition 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 6
- 229940093916 potassium phosphate Drugs 0.000 claims description 6
- 235000011009 potassium phosphates Nutrition 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 235000017550 sodium carbonate Nutrition 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 4
- 235000011089 carbon dioxide Nutrition 0.000 claims description 4
- -1 phosphoric acid hydrogen Chemical class 0.000 claims description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 4
- VWDWKYIASSYTQR-YTBWXGASSA-N sodium;dioxido(oxo)azanium Chemical compound [Na+].[O-][15N+]([O-])=O VWDWKYIASSYTQR-YTBWXGASSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 150000003016 phosphoric acids Chemical class 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 8
- 239000000706 filtrate Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 230000001376 precipitating effect Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 12
- 229910019142 PO4 Inorganic materials 0.000 description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 6
- 239000010452 phosphate Substances 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
- 239000011591 potassium Substances 0.000 description 6
- 229910052700 potassium Inorganic materials 0.000 description 6
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002608 ionic liquid Substances 0.000 description 3
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000007516 brønsted-lowry acids Chemical class 0.000 description 1
- 150000007528 brønsted-lowry bases Chemical class 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229940111685 dibasic potassium phosphate Drugs 0.000 description 1
- KCIDZIIHRGYJAE-YGFYJFDDSA-L dipotassium;[(2r,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate Chemical compound [K+].[K+].OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@H]1O KCIDZIIHRGYJAE-YGFYJFDDSA-L 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a recovery and recycling method of a polyprotic acid inorganic salt solution; the inorganic salt with high solubility is converted into inorganic salt with low solubility by chemical reaction, which is precipitated from the solution, thus recovering the inorganic salt; the residual saturated filtrate is converted into the inorganic salt with low solubility by the chemical reaction and the inorganic salt is recycled. The method utilizes the chemical reaction to change the solute to achieve the object of precipitating the inorganic salt in the recovery solution; both the acid and the alkali in the reaction process are converted into chemical products without the emission of pollutants; therefore, the method of the invention is a green and environment-protective recovery method.
Description
Technical field
The present invention relates to a kind of recovery circulation means of polybasic acid inorganic salt solution.
Background technology
At present, produce a large amount of high density inorganic salt waste water in the chemical process.The inorganic salt solution of this high density directly enters the rivers water body, havoc water ecology not only, and existent environment of people also constituted great threat; If directly recycle equipment is stopped up, move not freely, also there are problems such as etching apparatus in the while.Chinese patent (application number: 200610017298.2) disclose by adding inorganic salt such as potassiumphosphate, dipotassium hydrogen phosphate or salt of wormwood and make the hydrophilic ionic-liquid aqueous solution form double-aqueous phase system for example, on form rich ionic liquid phase mutually, form rich salt face mutually, the ion liquid method of enriching and recovering from the aqueous solution down.With producing concentration at present mutually is 30%～60% inorganic salt solution, and this problem is restricting salt/salt double water-phase technology and reclaiming that ionic liquid is used and development.If the inorganic salt in the chemical process are separated the back comprehensive utilization, not only can eliminate environmental pollution, can also increase economic benefit.
Because the solubleness of these class inorganic salt is very big, and temperature is pair less with its solubleness influence, generally is difficult for adopting the crystalline method to reclaim.Simultaneously since the inorganic salt of high density to toxic and the restraining effect of microorganism, the microbiological treatment technology is subjected to very big restriction.Usually the recovery method that adopts is exactly a distillation method, but this method energy consumption is big, the cost height.Therefore the efficient recovery of high density inorganic salt, recycle for Chemical Manufacture and have great importance.
Summary of the invention
The method that the purpose of this invention is to provide a kind of recycle and reuse of polybasic acid inorganic salt solution.Principle of the present invention is to make the polybasic acid inorganic salt of high-dissolvability be converted into the inorganic salt of low solubility and separate out by chemical reaction, and saturated filtrate recycles by the polybasic acid inorganic salt solution that chemical reaction is converted into lower concentration again.For example the saturation solubility of salt of wormwood in the time of 20 ℃ is 112g, and the saturated dissolving of saleratus in the time of 20 ℃ has only 22.4g, therefore from solution, separate out when making the inorganic salt of high-dissolvability be converted into the inorganic salt of low solubility by chemical reaction, can reclaim inorganic salt.These inorganic salt of two types can be changed mutually under the condition of acid or alkali simultaneously, and the polybasic acid inorganic salt solution that obtains lower concentration can recycle.
The recovery circulation means of a kind of polybasic acid inorganic salt solution of the present invention, its step and condition are as follows:
Described polybasic acid inorganic salt solution is aqueous phosphatic, phosphoric acid hydrogen two salt brine solutions or carbonate aqueous solution; Preferential salt of wormwood, yellow soda ash, potassiumphosphate, dipotassium hydrogen phosphate or the ammonium dibasic phosphate solution of adopting;
Described mineral acid acid is preferential to be adopted phosphoric acid or feeds carbonic acid gas;
Described mineral alkali preferentially adopts potassium hydroxide, sodium hydroxide or ammoniacal liquor;
In massfraction is 15%～60% aqueous phosphatic, phosphoric acid hydrogen two salt brine solutions or carbonate aqueous solution, add mineral acid respectively, proportioning according to chemical reaction equilibrium, phosphoric acid salt: the mol ratio of mineral acid is 1: 2, phosphoric acid hydrogen disalt: the mol ratio of mineral acid is 1: 1, salt of wormwood: the mol ratio of mineral acid is 1: 1, separates out from solution after being converted into dihydrogen phosphate or supercarbonate fully respectively, filtration, drying obtain dihydrogen phosphate or supercarbonate product; Rest solution is the saturated solution of dihydrogen phosphate or supercarbonate;
Add mineral alkali respectively for this saturated solution, proportioning according to the equilibrium chemistry reaction, dihydrogen phosphate: the mol ratio of mineral alkali 1: 2, dihydrogen phosphate: the mol ratio of mineral alkali is 1: 1, supercarbonate: the mol ratio of mineral alkali is 1: 1, be converted into massfraction respectively fully and be 20%～25% low phosphorus hydrochlorate, phosphoric acid hydrogen disalt or carbonate solution, this inorganic salt solution can recycle.
Beneficial effect: (1) owing to the concentration difference of inorganic salt, the concentration that reclaims the back inorganic salt solution is reduced to 10%～30%, and the inorganic salt solution of this lower concentration has reduced plant issue, can recycle.
(2) this method is utilized acid-base neutralisation reaction change solute to reach and is separated out the purpose that reclaims inorganic salt in the solution, and the bronsted lowry acids and bases bronsted lowry of reaction process all is converted into chemical products, and non-pollutant discharge, is a kind of recovery method of environmental protection.
(3) simple, the processing ease of big, the equipment of this method treatment capacity, energy efficient.
Embodiment
The recovery of embodiment 1 potassium phosphate solution
Getting massfraction respectively is 30%, 50% and 60% potassiumphosphate aqueous solution 10g, proportioning according to chemical reaction equilibrium, potassiumphosphate: the mol ratio of phosphoric acid is respectively to add 3.46g at 1: 2,5.77g and 6.92g concentration is 80% phosphoric acid, from solution, separate out after making it be converted into potassium primary phosphate fully, filter, dry, obtain 4.02g, 8.22g, 10.32g potassium dihydrogen phosphate product, filtrate is 18.50% potassium primary phosphate saturated solution, proportioning according to chemical reaction equilibrium, potassium primary phosphate: the mol ratio of potassium hydroxide is 1: 2, add 1.44g respectively, 1.15g, 1.01g it is 25.09% that potassium hydroxide makes it be converted into massfraction fully, 25.06%, 25.00% lower concentration phosphoric acid potassium, this inorganic salt solution can recycle.
The recovery of embodiment 2 dipotassium hydrogen phosphate solutions
Getting massfraction respectively is 30%, 40% and 60% aqueous dibasic potassium phosphate solution 10g, proportioning according to chemical reaction equilibrium, dipotassium hydrogen phosphate: the mol ratio of phosphoric acid is respectively to add 2.11g at 1: 1,2.81g and 4.22g concentration is 80% phosphoric acid, from solution, separate out after making it be converted into potassium primary phosphate fully, filter, drying obtains 2.78g, 4.76g, 8.27g potassium dihydrogen phosphate product, filtrate is 18.50% potassium primary phosphate saturated solution, proportioning according to chemical reaction equilibrium, potassium primary phosphate: the mol ratio of potassium hydroxide is 1: 1, add 0.79g respectively, 0.58g, 0.45g it is 24.21% that potassium hydroxide makes it be converted into massfraction fully, 22.03%, 22.03% lower concentration phosphoric acid hydrogen dipotassium, this inorganic salt solution can recycle.
The recovery of embodiment 3 solution of potassium carbonate
Getting massfraction respectively is 30%, 50% wet chemical 10g, proportioning according to chemical reaction equilibrium, salt of wormwood: the mol ratio of carbonic acid gas is respectively to feed 0.022mol at 1: 1,0.036mol carbon dioxide, from solution, separate out after making it be converted into saleratus fully, filter, drying obtains 2.87g, 6.28g saleratus product, filtrate is 18.30% saleratus saturated solution, proportioning according to chemical reaction equilibrium, saleratus: the mol ratio of potassium hydroxide is 1: 1, add 0.83g respectively, 0.54g potassium hydroxide makes it be converted into massfraction fully and is 22.87% lower concentration saleratus, this inorganic salt solution can recycle.
The recovery of embodiment 4 sodium carbonate solutions
Get massfraction and be 15% aqueous sodium carbonate 10g, proportioning according to chemical reaction equilibrium, yellow soda ash: the mol ratio of carbonic acid gas is the carbon dioxide of 1: 1 feeding 0.014mol, from solution, separate out after making it be converted into sodium bicarbonate fully, filter, drying obtains 1.54g sodium bicarbonate product, filtrate is 8.76% saturated solution of sodium bicarbonate, proportioning according to chemical reaction equilibrium, answer sodium bicarbonate: the mol ratio of sodium hydroxide is 1: 1, adding 0.40g sodium hydroxide makes it be converted into massfraction fully and is 10.61% lower concentration sodium bicarbonate, and this inorganic salt solution can recycle.
The recovery of embodiment 5 ammonium dibasic phosphate solutions
Get massfraction and be 40% ammonium dibasic phosphate aqueous solution 10g, proportioning according to chemical reaction equilibrium, Secondary ammonium phosphate: the mol ratio of phosphoric acid is that to add 3.71g concentration at 1: 1 be 80% phosphoric acid, from solution, separate out after making it be converted into primary ammonium phosphate fully, filter, drying obtains 0.91g primary ammonium phosphate product, filtrate is 29.38% primary ammonium phosphate saturated solution, proportioning according to chemical reaction equilibrium, primary ammonium phosphate: the mol ratio of ammoniacal liquor is 1: 1, adding 1.66g concentration is 25% ammoniacal liquor, making it be converted into massfraction fully is 28.75% lower concentration phosphoric acid hydrogen two ammoniums, and this inorganic salt solution can recycle.
Claims (2)
1. the recovery circulation means of a polybasic acid inorganic salt solution is characterized in that, its step and condition are as follows:
Described polybasic acid inorganic salt solution is aqueous phosphatic, phosphoric acid hydrogen two salt brine solutions or carbonate aqueous solution;
Described mineral acid acid is adopted phosphoric acid or is fed carbonic acid gas;
Described mineral alkali adopts potassium hydroxide, sodium hydroxide or ammoniacal liquor;
In massfraction is 15%～60% aqueous phosphatic, phosphoric acid hydrogen two salt brine solutions or carbonate aqueous solution, add mineral acid respectively, proportioning according to chemical reaction equilibrium, phosphoric acid salt: the mol ratio of mineral acid is 1: 2, phosphoric acid hydrogen disalt: the mol ratio of mineral acid is 1: 1, salt of wormwood: the mol ratio of mineral acid is 1: 1, separates out from solution after being converted into dihydrogen phosphate or supercarbonate fully respectively, filtration, drying obtain dihydrogen phosphate or supercarbonate product; Rest solution is the saturated solution of dihydrogen phosphate or supercarbonate;
Add mineral alkali respectively for this saturated solution, proportioning according to the equilibrium chemistry reaction, dihydrogen phosphate: the mol ratio of mineral alkali 1: 2, dihydrogen phosphate: the mol ratio of mineral alkali is 1: 1, supercarbonate: the mol ratio of mineral alkali is 1: 1, be converted into massfraction respectively fully and be 20%～25% low phosphorus hydrochlorate, phosphoric acid hydrogen disalt or carbonate solution, this inorganic salt solution can recycle.
2, the recovery circulation means of a kind of polybasic acid inorganic salt solution as claimed in claim 1 is characterized in that, described polybasic acid inorganic salt solution is salt of wormwood, yellow soda ash, potassiumphosphate, dipotassium hydrogen phosphate or ammonium dibasic phosphate solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100509834A CN101323443B (en) | 2008-07-21 | 2008-07-21 | Reclaiming circulation method of polybasic acid inorganic salt solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100509834A CN101323443B (en) | 2008-07-21 | 2008-07-21 | Reclaiming circulation method of polybasic acid inorganic salt solution |
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| Publication Number | Publication Date |
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| CN101323443A true CN101323443A (en) | 2008-12-17 |
| CN101323443B CN101323443B (en) | 2010-09-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013091129A1 (en) * | 2011-12-19 | 2013-06-27 | General Electric Company | Membrane filtration process for industrial process water treatment and recovery |
| CN104016427A (en) * | 2014-06-16 | 2014-09-03 | 重庆市畜牧科学院 | Method and system for recovering dissolved phosphorus from sewage by repeatedly using carbon dioxide at room temperature |
| CN107501047A (en) * | 2017-09-07 | 2017-12-22 | 太原理工大学 | A kind of method for preparing high-purity propylene alcohol |
-
2008
- 2008-07-21 CN CN2008100509834A patent/CN101323443B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013091129A1 (en) * | 2011-12-19 | 2013-06-27 | General Electric Company | Membrane filtration process for industrial process water treatment and recovery |
| CN104016427A (en) * | 2014-06-16 | 2014-09-03 | 重庆市畜牧科学院 | Method and system for recovering dissolved phosphorus from sewage by repeatedly using carbon dioxide at room temperature |
| CN104016427B (en) * | 2014-06-16 | 2015-08-19 | 重庆市畜牧科学院 | Reuse the method and system that carbonic acid gas reclaims from the molten phosphorus of sewage at normal temperatures |
| CN107501047A (en) * | 2017-09-07 | 2017-12-22 | 太原理工大学 | A kind of method for preparing high-purity propylene alcohol |
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| Publication number | Publication date |
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| CN101323443B (en) | 2010-09-29 |
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