CN104150456B - The method producing synthos and sodium ascorbyl phosphate with sodium sulfate wastewater - Google Patents
The method producing synthos and sodium ascorbyl phosphate with sodium sulfate wastewater Download PDFInfo
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- CN104150456B CN104150456B CN201410396598.0A CN201410396598A CN104150456B CN 104150456 B CN104150456 B CN 104150456B CN 201410396598 A CN201410396598 A CN 201410396598A CN 104150456 B CN104150456 B CN 104150456B
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Abstract
The present invention is a kind of method that sodium sulfate wastewater produces synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 80-90% of excessive 5-15% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.6 ~ 3.2, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.5 ~ 7.0 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate. Present invention process advantages of simple, workable, conversion ratio is high. It has processed waste water and has saved resource, not only protects environment and also achieves the recycling of resource. Experiments verify that, the present invention can convert the sodium sulfate of 80 ~ 90%.
Description
Technical field
The present invention relates to a kind of method that a kind of method for production of phosphate salt, particularly sodium sulfate wastewater produce synthos and sodium ascorbyl phosphate.
Background technology
Sodium sulfate, inorganic compound, Disodium sulfate decahydrate has another name called Natrii Sulfas, white, odorless, the crystallization having bitterness or powder, has hygroscopicity. Profile is colourless, transparent, big crystallization or the little crystallization of graininess. It is mainly used in controlling the water circulation glass, glass, enamel, paper pulp, refrigeration intermixture, detergent, desiccant, dye-dilution agent, analytical chemistry reagent, pharmaceuticals etc. Sodium sulfate is widely present in nature and chemical spent material. In silicon dioxide production process, can produce to contain in a large number the waste water of sodium sulfate, this waste water can not be well carried out by prior art utilize, cause certain wasting of resources.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, it is provided that a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is reasonable in design, easy to operate, and cost is low, efficiently utilizes waste resource.
The technical problem to be solved is to be realized by following technical scheme. The present invention is a kind of method that sodium sulfate wastewater produces synthos and sodium ascorbyl phosphate, is characterized in: the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 80-90% of excessive 5-15% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.6 ~ 3.2, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.5 ~ 7.0 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
The raw material of the inventive method can be the waste water containing sodium sulfate produced in the waste water, particularly silicon dioxide production process containing sodium sulfate produced in technique.
Sodium sulfate wastewater of the present invention produces in the method and technology scheme of synthos and sodium ascorbyl phosphate, it is preferred that technical scheme or technology is characterized in that phosphoric acid affiliated in raw material sulphuric acid sodium waste water is excessive 8-12%, it is most preferred that 10%;The mass concentration of phosphoric acid is 84-86%, it is most preferred that 85%.
Sodium sulfate wastewater of the present invention produces in the method and technology scheme of synthos and sodium ascorbyl phosphate, it is preferred that technical scheme or technology is characterized in that control ph 2.8 ~ 3.0 when adding lime cream first, it is most preferred that pH value 2.9; When continuously adding lime cream, control ph 6.6 ~ 6.8, it is most preferred that pH value 6.7.
The technical scheme is that employing adds a kind of weak acid in metabisulfite solution and lime cream reacts, driving a reaction carries out in acid condition. The present invention utilizes calcium hydroxide and phosphoric acid, displaces the sodium ion in sodium sulfate wastewater, and produce synthos and sodium ascorbyl phosphate under sour environment. Its reaction equation is as follows:
2Na2SO4+3Ca(OH) 2+2H3PO4=2CaSO4+CaHPO4+Na2HPO4
The present invention adopts and prepares synthos and sodium ascorbyl phosphate at sodium sulfate with calcium hydroxide and phosphatase reaction, and because sodium sulfate and calcium hydroxide are all alkaline matters, under generic condition, this reaction is difficult to carry out. By adding suitable phosphoric acid in the solution, solution being transformed into sour environment, make molecular balance move to left, wherein sulfate radical and calcium ion are easier to generate calcium sulfate precipitation.
Compared with prior art, present invention process advantages of simple, workable, conversion ratio is high. It has processed waste water and has saved resource, not only protects environment and also achieves the recycling of resource. Experiments verify that, the present invention can convert the sodium sulfate of 80 ~ 90%.
Detailed description of the invention
The concrete technical scheme of the present invention described further below, in order to those skilled in the art is further understood that the present invention, and does not constitute the restriction to its right.
Embodiment 1, a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 80% of excessive 5% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.6, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.5 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
Embodiment 2, a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 90% of excessive 15% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 3.2, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 7.0 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
Embodiment 3, a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 85% of excessive 10% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.9, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.7 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.This programme can realize converting the sodium sulfate of 90%.
Embodiment 4, a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 84% of excessive 8% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.8, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.6 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
Embodiment 5, a kind of sodium sulfate wastewater produces the method for synthos and sodium ascorbyl phosphate, and the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 86% of excessive 12% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 3.0, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.8 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
In method described in embodiment 1-5, raw material is the waste water containing sodium sulfate to produce in silicon dioxide production process.
Claims (6)
1. the method producing synthos and sodium ascorbyl phosphate with sodium sulfate wastewater, it is characterised in that: the method is with the waste water containing sodium sulfate for raw material; First adding the phosphoric acid that mass concentration is 80-90% of excessive 5-15% in raw material sulphuric acid sodium waste water, it is acid for making solution, makes the complete acidifying of sodium sulfate; Then it is added thereto to lime cream, control ph 2.6 ~ 3.2, generates calcium sulfate precipitation, and remove the sulfate radical in solution; Filtering, continuously add lime cream, control ph 6.5 ~ 7.0 in filtrate, after reaction terminates, obtaining solid is calcium hydrogen phosphate, and liquid is mainly sodium ascorbyl phosphate.
2. the method that sodium sulfate wastewater according to claim 1 produces synthos and sodium ascorbyl phosphate, it is characterised in that: the waste water containing sodium sulfate that the method produces in silicon dioxide production process is for raw material.
3. the method that sodium sulfate wastewater according to claim 1 produces synthos and sodium ascorbyl phosphate, it is characterised in that: in raw material sulphuric acid sodium waste water, affiliated phosphoric acid is excessive 8-12%, and the mass concentration of phosphoric acid is 84-86%.
4. the method that sodium sulfate wastewater according to claim 1 produces synthos and sodium ascorbyl phosphate, it is characterised in that: in raw material sulphuric acid sodium waste water, affiliated phosphoric acid is excessive 10%, and the mass concentration of phosphoric acid is 85%.
5. the method that sodium sulfate wastewater according to claim 1 produces synthos and sodium ascorbyl phosphate, it is characterised in that: add control ph 2.8 ~ 3.0 during lime cream first; When continuously adding lime cream, control ph 6.6 ~ 6.8.
6. the method that sodium sulfate wastewater according to claim 1 produces synthos and sodium ascorbyl phosphate, it is characterised in that: add control ph 2.9 during lime cream first; When continuously adding lime cream, control ph 6.7.
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| CN106241851B (en) * | 2016-07-26 | 2018-01-05 | 四川高绿平环境科技有限公司 | A kind of processing method of useless phosphoric acid,diluted |
| CN117902610B (en) * | 2024-01-19 | 2024-07-05 | 天津大学 | Method for recycling sodium sulfate high-salt wastewater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87103218A (en) * | 1987-04-26 | 1988-11-23 | 杜良才 | Novel method with saltcake production SODIUMNITRATE |
| CN1285312A (en) * | 1999-08-22 | 2001-02-28 | 李怀然 | novel process for preparing fodder grade calcium hydrophosphate and by-product calcium carbonate and ammonium chloride by hydrochloric acid method |
| CN103880209A (en) * | 2014-03-12 | 2014-06-25 | 广东宇星阻燃新材有限公司 | Processing method of sodium sulfate wastewater |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87103218A (en) * | 1987-04-26 | 1988-11-23 | 杜良才 | Novel method with saltcake production SODIUMNITRATE |
| CN1285312A (en) * | 1999-08-22 | 2001-02-28 | 李怀然 | novel process for preparing fodder grade calcium hydrophosphate and by-product calcium carbonate and ammonium chloride by hydrochloric acid method |
| CN103880209A (en) * | 2014-03-12 | 2014-06-25 | 广东宇星阻燃新材有限公司 | Processing method of sodium sulfate wastewater |
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Effective date of registration: 20191112 Address after: No.66, Huanghe Road, Donghai Economic Development Zone, Lianyungang City, Jiangsu Province Patentee after: Jiangsu Debang Doling Health Technology Co., Ltd. Address before: 222000 No. 180, new sea road, Haizhou District, Jiangsu, Lianyungang Patentee before: Lianyungang Debang Fine Chemical Co., Ltd. |
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