CN112978701A - Preparation method of sodium hexametaphosphate - Google Patents
Preparation method of sodium hexametaphosphate Download PDFInfo
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- CN112978701A CN112978701A CN201911288131.3A CN201911288131A CN112978701A CN 112978701 A CN112978701 A CN 112978701A CN 201911288131 A CN201911288131 A CN 201911288131A CN 112978701 A CN112978701 A CN 112978701A
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- sodium hexametaphosphate
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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
- C01B25/38—Condensed phosphates
- C01B25/44—Metaphosphates
- C01B25/445—Metaphosphates of alkali metals
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Abstract
The invention discloses a preparation method of sodium hexametaphosphate, which comprises the following steps: step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system; step two, reacting the mixed system obtained in the step one at the temperature of 150-250 ℃ in a nitrogen atmosphere to obtain a reacted system; step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature; step four, separating the cooled system in the step three to obtain a solid; step five, roasting the solid obtained in the step four; and step six, cooling the solid roasted in the step five to room temperature to obtain sodium hexametaphosphate. The method is protected and cooled by nitrogen in the whole process, and the obtained product sodium hexametaphosphate has high purity and high yield, and the preparation method is simple, the raw material cost is low, the reaction process is easy to control, and no pollutant is discharged.
Description
Technical Field
The invention belongs to the technical field of sodium hexametaphosphate, and particularly relates to a preparation method of sodium hexametaphosphate.
Background
Sodium hexametaphosphate is a white odorless crystalline powder, is insoluble in organic solvents, and has strong moisture absorption performance. Can be complexed with metal magnesium, calcium and the like to generate soluble complex compounds. Sodium hexametaphosphate is commonly used as a water softener, a water treatment agent, a corrosion inhibitor, a flotation agent, a dispersant, an auxiliary agent, a rust remover, a cement hardener and the like for industrial water.
The common method for producing sodium hexametaphosphate is to obtain sodium hexametaphosphate by neutralizing phosphoric acid with caustic soda, then polymerizing, quenching and solidifying. The preparation method mainly has the defects of insufficient arsenic removal, harm to human health caused by arsenic residues in products, complex preparation process, higher operation and control difficulty coefficient, discharge of pollution wastes, unstable product quality and the like.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for preparing sodium hexametaphosphate, which aims at the defects of the prior art. The method is protected and cooled by nitrogen in the whole process, and the obtained product sodium hexametaphosphate has high purity and high yield, and the preparation method is simple, the raw material cost is low, the reaction process is easy to control, and no pollutant is discharged.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of sodium hexametaphosphate is characterized by comprising the following steps:
step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system;
step two, reacting the mixed system obtained in the step one at the temperature of 150-250 ℃ in a nitrogen atmosphere to obtain a reacted system;
step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature;
step four, separating the cooled system in the step three to obtain a solid;
step five, roasting the solid obtained in the step four;
and step six, cooling the solid roasted in the step five to room temperature to obtain sodium hexametaphosphate.
The preparation method of sodium hexametaphosphate is characterized in that the mass ratio of sodium hydroxide to phosphoric acid in the first step is (1-5): 1.
the preparation method of the sodium hexametaphosphate is characterized in that the reaction time in the step two is 1-3 h.
The preparation method of the sodium hexametaphosphate is characterized in that the roasting temperature in the fifth step is 500-800 ℃, and the roasting time is 3-6 h.
The preparation method of sodium hexametaphosphate is characterized in that in the sixth step, the solid roasted in the fifth step is cooled by introducing nitrogen into the solid.
Compared with the prior art, the invention has the following advantages:
1. the method of the invention uses nitrogen gas for protection and cooling in the whole process, and the obtained product sodium hexametaphosphate has high purity, high yield, simple preparation method, low cost of raw materials, easy control of the reaction process and no pollutant discharge.
The technical solution of the present invention is further described in detail with reference to the following examples.
Detailed Description
Example 1
The preparation method of sodium hexametaphosphate in the embodiment comprises the following steps:
step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system; the mass ratio of the sodium hydroxide to the phosphoric acid is 3: 1;
step two, reacting the mixed system obtained in the step one for 2 hours at the temperature of 200 ℃ in a nitrogen atmosphere to obtain a reacted system;
step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature;
step four, separating the cooled system in the step three to obtain a solid;
step five, roasting the solid obtained in the step four; the roasting temperature is 600 ℃, and the roasting time is 4 hours;
sixthly, cooling the solid roasted in the fifth step to room temperature to obtain sodium hexametaphosphate; and cooling by introducing nitrogen into the solid after the roasting in the step five.
Example 2
The preparation method of sodium hexametaphosphate in the embodiment comprises the following steps:
step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system; the mass ratio of the sodium hydroxide to the phosphoric acid is 1: 1;
step two, reacting the mixed system obtained in the step one for 3 hours at the temperature of 150 ℃ in a nitrogen atmosphere to obtain a reacted system;
step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature;
step four, separating the cooled system in the step three to obtain a solid;
step five, roasting the solid obtained in the step four; the roasting temperature is 500 ℃, and the roasting time is 6 hours;
sixthly, cooling the solid roasted in the fifth step to room temperature to obtain sodium hexametaphosphate; and cooling by introducing nitrogen into the solid after the roasting in the step five.
Example 3
The preparation method of sodium hexametaphosphate in the embodiment comprises the following steps:
step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system; the mass ratio of the sodium hydroxide to the phosphoric acid is 5: 1;
step two, reacting the mixed system obtained in the step one for 1h at the temperature of 250 ℃ in a nitrogen atmosphere to obtain a reacted system;
step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature;
step four, separating the cooled system in the step three to obtain a solid;
step five, roasting the solid obtained in the step four; the roasting temperature is 800 ℃, and the roasting time is 3 hours;
sixthly, cooling the solid roasted in the fifth step to room temperature to obtain sodium hexametaphosphate; and cooling by introducing nitrogen into the solid after the roasting in the step five.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A preparation method of sodium hexametaphosphate is characterized by comprising the following steps:
step one, mixing sodium hydroxide and phosphoric acid under the stirring condition to obtain a mixed system;
step two, reacting the mixed system obtained in the step one at the temperature of 150-250 ℃ in a nitrogen atmosphere to obtain a reacted system;
step three, introducing nitrogen into the reacted system for circulation until the reacted system is cooled to room temperature;
step four, separating the cooled system in the step three to obtain a solid;
step five, roasting the solid obtained in the step four;
and step six, cooling the solid roasted in the step five to room temperature to obtain sodium hexametaphosphate.
2. The method for preparing sodium hexametaphosphate according to claim 1, wherein the ratio of the amount of sodium hydroxide to the amount of phosphoric acid in step one is (1-5): 1.
3. the method for preparing sodium hexametaphosphate according to claim 1, wherein the reaction time in step two is 1-3 h.
4. The method for preparing sodium hexametaphosphate according to claim 1, wherein the temperature of calcination in step five is 500-800 ℃ and the calcination time is 3-6 h.
5. The method for preparing sodium hexametaphosphate according to claim 1, wherein the cooling in the sixth step is performed by introducing nitrogen into the calcined solid in the fifth step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911288131.3A CN112978701A (en) | 2019-12-15 | 2019-12-15 | Preparation method of sodium hexametaphosphate |
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| CN201911288131.3A CN112978701A (en) | 2019-12-15 | 2019-12-15 | Preparation method of sodium hexametaphosphate |
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| CN112978701A true CN112978701A (en) | 2021-06-18 |
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| CN201911288131.3A Pending CN112978701A (en) | 2019-12-15 | 2019-12-15 | Preparation method of sodium hexametaphosphate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116443837A (en) * | 2023-02-28 | 2023-07-18 | 贵州胜威福全化工有限公司 | Method for preparing sodium hexametaphosphate from sodium sulfate and phosphoric acid |
-
2019
- 2019-12-15 CN CN201911288131.3A patent/CN112978701A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116443837A (en) * | 2023-02-28 | 2023-07-18 | 贵州胜威福全化工有限公司 | Method for preparing sodium hexametaphosphate from sodium sulfate and phosphoric acid |
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Application publication date: 20210618 |
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| WD01 | Invention patent application deemed withdrawn after publication |