CN107662911A - A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide - Google Patents
A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide Download PDFInfo
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- CN107662911A CN107662911A CN201610616275.7A CN201610616275A CN107662911A CN 107662911 A CN107662911 A CN 107662911A CN 201610616275 A CN201610616275 A CN 201610616275A CN 107662911 A CN107662911 A CN 107662911A
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- Prior art keywords
- phosphoric acid
- sodium hydroxide
- dihydrogen phosphate
- solution
- waste phosphoric
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- 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
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
Abstract
The present invention relates to a kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, comprise the following steps：1) waste phosphoric acid solution is heated to 50~80 DEG C, useless sodium hydroxide solution is added dropwise into waste phosphoric acid solution under stirring condition, until the pH value of reaction solution is 3~5, obtains reaction solution A；2) activated carbon is added into reaction solution A, 1~2h of stirring, filtering, collects filtrate；3) filtrate is cooled to 0~10 DEG C, stands still for crystals, filters, sodium dihydrogen phosphate is obtained after filtration cakes torrefaction.The present invention prepares sodium dihydrogen phosphate using waste phosphoric acid solution, useless sodium hydroxide solution, realizes the recycling of discarded object, and realizing turns waste into wealth, while avoids waste phosphoric acid solution, the discharge of useless sodium hydroxide solution and the pollution of environment, is effectively protected environment；Preparation method of the present invention is easy, and production cost is low, safe, is easy to industrialized production.
Description
Technical field
The present invention relates to a kind of preparation method of sodium dihydrogen phosphate, is specially that one kind utilizes waste phosphoric acid, useless sodium hydroxide system
The method of standby sodium dihydrogen phosphate, belongs to chemical technology field.
Background technology
Sodium dihydrogen phosphate, colourless iris crystallization, slightly hygroscopicity, are the originals for manufacturing calgon and sodium pyrophosphate
Material, it is mainly used in process hides, processing boiler water, as quality improver and baking powder processed, and delays in food industry, fermentation industry
Electuary and fermentation powder raw material, also serve as feed addictive, detergent and dye auxiliary agent etc., purposes is very extensive.
At present, sodium dihydrogen phosphate industrialized production is reacted frequently with thermal phosphoric acid or Wet Phosphoric Acid Market with sodium carbonate.But
It is, in place of this preparation method Shortcomings：(1) high energy consumption, pollution are big during phosphorous acid production by BEP；(2) phosphoric acid by wet process
Purify many unfavorable factors such as process route length, technology controlling and process inconvenience, production cost height.
The content of the invention
The present invention is directed to deficiency of the prior art, there is provided a kind of low energy consumption, the side of low cost production sodium dihydrogen phosphate
Method, turn waste into wealth, make full use of existing waste material.
The technical solution adopted by the present invention is：
A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, comprises the following steps：
1) waste phosphoric acid solution is heated to 50~80 DEG C, it is molten that useless sodium hydroxide is added dropwise into waste phosphoric acid solution under stirring condition
Liquid, until the pH value of reaction solution is 3~5, obtain reaction solution A；
2) activated carbon is added into reaction solution A, 1~2h of stirring, filtering, collects filtrate；
3) filtrate is cooled to 0~10 DEG C, stands still for crystals, filters, sodium dihydrogen phosphate is obtained after filtration cakes torrefaction.
Preferably, a kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, in the waste phosphoric acid solution
The mass concentration of phosphoric acid is 20~30%, the mass concentration 16~28% of sodium hydroxide in the useless sodium hydroxide solution.
Preferably, a kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, the quality of the activated carbon
For the 3~5% of waste phosphoric acid solution quality.
Preferably, a kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, it is described to stand still for crystals the time
For 2~5h.
The beneficial effects of the present invention are:
1st, raw material waste phosphoric acid solution and useless sodium hydroxide solution of the invention are all from industrial produced wastes, utilize useless phosphorus
Acid solution, useless sodium hydroxide solution prepare sodium dihydrogen phosphate, realize the recycling of discarded object, realizing turns waste into wealth.
2nd, sodium dihydrogen phosphate is prepared using waste phosphoric acid solution, useless sodium hydroxide solution, avoids waste phosphoric acid solution, useless hydrogen-oxygen
Change the discharge of sodium solution and the pollution of environment, be effectively protected environment.
3rd, preparation method of the present invention is easy, and production cost is low, safe, is easy to industrialized production.
Embodiment
The invention will be further described in conjunction with specific embodiments.
Embodiment 1
1) the waste phosphoric acid solution that 100Kg phosphoric acid qualities concentration is 20% is heated to 80 DEG C, to waste phosphoric acid under stirring condition
The useless sodium hydroxide solution that sodium hydroxide mass concentration is 20% is added dropwise in solution, until the pH value of reaction solution is 5, obtains anti-
Answer liquid A；
2) activated carbon 5Kg is added into reaction solution A, stirring 2h, filtering, collects filtrate；
3) filtrate is cooled to 10 DEG C, and sodium dihydrogen phosphate is obtained after standing still for crystals 5h, filtering, filtration cakes torrefaction.
Embodiment 2
1) the waste phosphoric acid solution that 100Kg phosphoric acid qualities concentration is 25% is heated to 60 DEG C, to waste phosphoric acid under stirring condition
The useless sodium hydroxide solution that sodium hydroxide mass concentration is 28% is added dropwise in solution, until the pH value of reaction solution is 3, obtains anti-
Answer liquid A；
2) activated carbon 3Kg is added into reaction solution A, stirring 2h, filtering, collects filtrate；
3) filtrate is cooled to 5 DEG C, and sodium dihydrogen phosphate is obtained after standing still for crystals 3h, filtering, filtration cakes torrefaction.
Embodiment 3
1) the waste phosphoric acid solution that 100Kg phosphoric acid qualities concentration is 20% is heated to 60 DEG C, to waste phosphoric acid under stirring condition
The useless sodium hydroxide solution that sodium hydroxide mass concentration is 16% is added dropwise in solution, until the pH value of reaction solution is 4, obtains anti-
Answer liquid A；
2) activated carbon 5Kg is added into reaction solution A, stirring 1h, filtering, collects filtrate；
3) filtrate is cooled to 2 DEG C, and sodium dihydrogen phosphate is obtained after standing still for crystals 3h, filtering, filtration cakes torrefaction.
Embodiment 4
1) the waste phosphoric acid solution that 100Kg phosphoric acid qualities concentration is 30% is heated to 50 DEG C, to waste phosphoric acid under stirring condition
The useless sodium hydroxide solution that sodium hydroxide mass concentration is 20% is added dropwise in solution, until the pH value of reaction solution is 5, obtains anti-
Answer liquid A；
2) activated carbon 4Kg is added into reaction solution A, stirring 1h, filtering, collects filtrate；
3) filtrate is cooled to 0 DEG C, and sodium dihydrogen phosphate is obtained after standing still for crystals 2h, filtering, filtration cakes torrefaction.
Embodiment 5
1) the waste phosphoric acid solution that 100Kg phosphoric acid qualities concentration is 25% is heated to 80 DEG C, to waste phosphoric acid under stirring condition
The useless sodium hydroxide solution that sodium hydroxide mass concentration is 20% is added dropwise in solution, until the pH value of reaction solution is 4, obtains anti-
Answer liquid A；
2) activated carbon 4Kg is added into reaction solution A, stirring 1.5h, filtering, collects filtrate；
3) filtrate is cooled to 0 DEG C, and sodium dihydrogen phosphate is obtained after standing still for crystals 3h, filtering, filtration cakes torrefaction.
Claims (4)
- A kind of 1. method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, it is characterised in that comprise the following steps：1) waste phosphoric acid solution is heated to 50~80 DEG C, useless sodium hydroxide solution is added dropwise into waste phosphoric acid solution under stirring condition, Until the pH value of reaction solution is 3~5, reaction solution A is obtained；2) activated carbon is added into reaction solution A, 1~2h of stirring, filtering, collects filtrate；3) filtrate is cooled to 0~10 DEG C, stands still for crystals, filters, sodium dihydrogen phosphate is obtained after filtration cakes torrefaction.
- 2. the method according to claim 1 for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, its feature exist In the mass concentration of phosphoric acid is 20~30% in the waste phosphoric acid solution, the matter of sodium hydroxide in the useless sodium hydroxide solution Measure concentration 16~28%.
- 3. the method according to claim 1 for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, its feature exist In the quality of the activated carbon is the 3~5% of waste phosphoric acid solution quality.
- 4. the method according to claim 1 for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide, its feature exist In described to stand still for crystals the time be 2~5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610616275.7A CN107662911A (en) | 2016-07-30 | 2016-07-30 | A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610616275.7A CN107662911A (en) | 2016-07-30 | 2016-07-30 | A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide |
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| CN107662911A true CN107662911A (en) | 2018-02-06 |
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| CN201610616275.7A Pending CN107662911A (en) | 2016-07-30 | 2016-07-30 | A kind of method for preparing sodium dihydrogen phosphate using waste phosphoric acid, useless sodium hydroxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651301A (en) * | 2021-08-16 | 2021-11-16 | 无锡中天固废处置有限公司 | Method for preparing sodium dihydrogen phosphate by using phosphorus-containing acid pickling waste liquid |
| CN115535980A (en) * | 2022-11-03 | 2022-12-30 | 黔南民族师范学院 | Method for preparing disodium hydrogen phosphate and ferric hydroxide from yellow phosphorus byproduct ferrophosphorus |
-
2016
- 2016-07-30 CN CN201610616275.7A patent/CN107662911A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651301A (en) * | 2021-08-16 | 2021-11-16 | 无锡中天固废处置有限公司 | Method for preparing sodium dihydrogen phosphate by using phosphorus-containing acid pickling waste liquid |
| CN115535980A (en) * | 2022-11-03 | 2022-12-30 | 黔南民族师范学院 | Method for preparing disodium hydrogen phosphate and ferric hydroxide from yellow phosphorus byproduct ferrophosphorus |
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Application publication date: 20180206 |