CN106882781A - A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product - Google Patents
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product Download PDFInfo
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- CN106882781A CN106882781A CN201710150363.7A CN201710150363A CN106882781A CN 106882781 A CN106882781 A CN 106882781A CN 201710150363 A CN201710150363 A CN 201710150363A CN 106882781 A CN106882781 A CN 106882781A
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- C01—INORGANIC CHEMISTRY
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- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/42—Pyrophosphates
- C01B25/425—Pyrophosphates of alkali metals
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Abstract
Method the present invention relates to be decolourized during a kind of crude product sodium pyrophosphate purification production sodium pyrophosphate product, during crude product sodium pyrophosphate purification production sodium pyrophosphate is produced, processed using oxidant, other microsolubility phosphoric acid (pyrophosphoric acid) aluminium salts, phosphoric acid (pyrophosphoric acid) molysite, phosphoric acid (pyrophosphoric acid) calcium salt etc. is avoided to separate out influence product quality, solve that sodium pyrophosphate product is rubescent, or problem rubescent in product storage and use；Reduce impurity phosphoric acid (pyrophosphoric acid) salt and bring sodium pyrophosphate product into, influence crystal habit, improve product quality solves the problems, such as the production of filtration difficulty.
Description
Technical field
The present invention relates to a kind of Sodium pyrophosphate preparation technology field, and in particular to a kind of crude product sodium pyrophosphate purification production is burnt
The method decolourized during sodium phosphate product.
Background technology
Sodium pyrophosphate is an important kind in condensed phosphate.Either technical grade and food-grade, its consumption are only secondary
In sodium tripolyphosphate.It is industrial to be mainly used in complexing agent, degreasing agent, water treatment agent, washing printing and dyeing bleaching assistant, dispersant etc..
The water holding for being then used for food in food industry is fresh-keeping, anti-oxidant etc., is referred to as quality improver.With China's technical grade and food
The market fast development of level sodium pyrophosphate, associated core production technology application, research and development and improve will be as looking forward in the industry
The concern of industry.The improvement of the production technology of sodium pyrophosphate is very crucial for enterprise's lifting market competitiveness with research and development.And burnt phosphorus
Sour sodium demand is just in the trend that increases substantially year by year.According to statistics, national sodium pyrophosphate volume of production and marketing annual average rate of increase is
7% or so, so the development potentiality in pyrophosphoric acid market is very big.
Conventional sodium pyrophosphate is white powder or crystallization, but due in the production process of sodium pyrophosphate, easily adulterating
Fe3+, make the sodium pyrophosphate for ultimately generating into red, and containing more impurity, significantly have impact on product quality.
The content of the invention
The present invention proposes what is decolourized during a kind of crude product sodium pyrophosphate purification production sodium pyrophosphate product regarding to the issue above
Method, solution sodium pyrophosphate product is rubescent, or problem rubescent in product storage and use；Reduce impurity phosphoric acid (pyrophosphoric acid) salt
Bring sodium pyrophosphate product into, influence crystal habit, improve product quality solves the problems, such as the production of filtration difficulty.
Specific technical scheme is as follows：
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：(0.8‐1.8)：The weight of (3-6.2)
Portion rate is mixed, and 0.5-4h is stirred at a temperature of 80-100 DEG C makes crude product sodium pyrophosphate fully dissolve；
(2) crude product sodium pyrophosphate adds oxidant after fully dissolving, and carries out oxidation reaction, and the addition of oxidant is burnt phosphorus
The 0.2%-5% of sour sodium crude product quality；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to 11-12, make Fe3+Form heavy
Form sediment, use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 9.8-10.5 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains Jiao
Sodium phosphate product.
The method decolourized during a kind of above-mentioned crude product sodium pyrophosphate purification production sodium pyrophosphate product, wherein, the oxidant
It is one or more in hydrogen peroxide, sodium chlorate, chlorine dioxide, ozone of combination.
The method decolourized during a kind of above-mentioned crude product sodium pyrophosphate purification production sodium pyrophosphate product, wherein, oxidizing temperature is
60-100 DEG C, oxidization time is 1-4h.
The method decolourized during a kind of above-mentioned crude product sodium pyrophosphate purification production sodium pyrophosphate product, wherein, the crude product is burnt
Sodium phosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
Beneficial effects of the present invention are：
The present invention is processed during crude product sodium pyrophosphate purification production sodium pyrophosphate is produced using oxidant, it is to avoid
Other microsolubility phosphoric acid (pyrophosphoric acid) aluminium salts, phosphoric acid (pyrophosphoric acid) molysite, phosphoric acid (pyrophosphoric acid) calcium salt etc. separate out influence product matter
Amount, solves that sodium pyrophosphate product is rubescent, or problem rubescent in product storage and use；Reduce impurity phosphoric acid (pyrophosphoric acid) salt
Bring sodium pyrophosphate product into, influence crystal habit, improve product quality solves the problems, such as the production of filtration difficulty.
Specific embodiment
To make technical scheme become apparent from clearly, below the present invention is described further, it is any to this
The technical characteristic of inventive technique scheme carries out the scheme that equivalencing and conventional reasoning draw and each falls within the scope of the present invention.
Embodiment one
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：1.02：4.5 ratio of weight and number adds
To mix, stirring 2h makes crude product sodium pyrophosphate fully dissolve at a temperature of 90 DEG C；
(2) crude product sodium pyrophosphate adds sodium chlorate after fully dissolving, and continues that hydrogen peroxide conduct is added dropwise after stirring 30-60min
Oxidant, carries out oxidation reaction, and oxidizing reaction temperature is 60-100 DEG C, and the addition of hydrogen peroxide is sodium pyrophosphate crude product quality
2.8%；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to after 11, make Fe3+Form precipitation,
Use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 10 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains sodium pyrophosphate
Product.
The crude product sodium pyrophosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
Embodiment two
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：1.3：5 ratio of weight and number is mixed
Close, 2.5h is stirred at a temperature of 85 DEG C makes crude product sodium pyrophosphate fully dissolve；
(2) add chlorine dioxide as oxidant after crude product sodium pyrophosphate fully dissolves, carry out oxidation reaction, chlorine dioxide
Addition for sodium pyrophosphate crude product quality 1.5%；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to after 12, make Fe3+Form precipitation,
Use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 10.5 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains pyrophosphoric acid
Sodium product.
The crude product sodium pyrophosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
Embodiment three
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：0.8：3 ratio of weight and number is mixed
Close, 1.8h is stirred at a temperature of 95 DEG C makes crude product sodium pyrophosphate fully dissolve；
(2) add ozone as oxidant after crude product sodium pyrophosphate fully dissolves, carry out oxidation reaction, oxidizing temperature is 70
DEG C, oxidization time is 1.5h, and the addition of ozone is the 4.2% of sodium pyrophosphate crude product quality；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to after 12, make Fe3+Form precipitation,
Use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 9.8 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains sodium pyrophosphate
Product.
The crude product sodium pyrophosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
Example IV
A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：1.8：6.2 ratio of weight and number is subject to
Mixing, stirring 3h makes crude product sodium pyrophosphate fully dissolve at a temperature of 90 DEG C；
(2) add sodium chlorate and chlorine dioxide as oxidant after crude product sodium pyrophosphate fully dissolves, carry out oxidation reaction,
Oxidizing temperature is 75 DEG C, and oxidization time is 3h, and the addition of sodium chlorate is the 0.8% of sodium pyrophosphate crude product quality, chlorine dioxide
Addition for sodium pyrophosphate crude product quality 2.3%；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to after 11, make Fe3+Form precipitation,
Use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 10.5 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains pyrophosphoric acid
Sodium product.
The crude product sodium pyrophosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
Claims (4)
1. a kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product, it is characterized by, its step is as follows：
(1) by crude product sodium pyrophosphate, fresh water and sodium pyrophosphate mother liquor is applied mechanically by 1：(0.8‐1.8)：The parts by weight of (3-6.2)
Than being mixed, stirring 0.5-4h makes crude product sodium pyrophosphate fully dissolve at a temperature of 80-100 DEG C；
(2) crude product sodium pyrophosphate adds oxidant after fully dissolving, and carries out oxidation reaction, and the addition of oxidant is sodium pyrophosphate
The 0.2%-5% of crude product quality；
(3) continue that sodium hydroxide solution is added dropwise, the pH value of sodium pyrophosphate mother liquor is adjusted to 11-12, make Fe3+Form precipitation,
Use charcoal absorption oily organic matter and Fe3+The colloidal precipitation of formation, by being filtered to remove；
(4) solution after filtering is adjusted into pH value to 9.8-10.5 using hydrochloric acid or phosphoric acid, then crystallisation by cooling obtains pyrophosphoric acid
Sodium product.
2. the method decolourized during a kind of crude product sodium pyrophosphate purification production sodium pyrophosphate product as claimed in claim 1, it is special
Levy as the oxidant is one or more in hydrogen peroxide, sodium chlorate, chlorine dioxide, ozone of combination.
3. the method decolourized during a kind of crude product sodium pyrophosphate purification production sodium pyrophosphate product as claimed in claim 1, it is special
Levy as oxidizing temperature is 60-100 DEG C, and oxidization time is 1-4h.
4. the method decolourized during a kind of crude product sodium pyrophosphate purification production sodium pyrophosphate product as claimed in claim 1, it is special
Levy as the crude product sodium pyrophosphate is the phosphate byproduct that glyphosate mother solution is reclaimed by high-temperature oxydation, polymerization.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399598A (en) * | 2018-12-28 | 2019-03-01 | 湖北泰盛化工有限公司 | A kind of method that the purification of crude product sodium pyrophosphate produces sodium pyrophosphate and sodium chloride |
| CN111646448A (en) * | 2020-05-26 | 2020-09-11 | 宜宾天原海丰和泰有限公司 | Method for preparing food-grade sodium pyrophosphate from glyphosate byproduct crude sodium pyrophosphate |
| CN112161259A (en) * | 2020-10-10 | 2021-01-01 | 镇江江南化工有限公司 | Method for reducing energy consumption in production of crude sodium pyrophosphate and directional conversion device thereof |
| CN115124014A (en) * | 2022-06-17 | 2022-09-30 | 灵宝市民生高新材料有限公司 | Preparation method of zinc pyrophosphate |
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| CN104118854A (en) * | 2013-04-27 | 2014-10-29 | 浙江新安化工集团股份有限公司 | Method for preparing tripolyphosphate and hexametaphosphate products by using byproduct pyrophosphate |
| CN104477864A (en) * | 2014-12-22 | 2015-04-01 | 什邡圣地亚化工有限公司 | Technology for producing phosphate from pyrophosphate |
| CN104891466A (en) * | 2015-05-14 | 2015-09-09 | 湖北兴发化工集团股份有限公司 | Production method of instant food-grade sodium pyrophosphate |
| CN106335889A (en) * | 2016-08-18 | 2017-01-18 | 宜宾天原集团股份有限公司 | Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104118854A (en) * | 2013-04-27 | 2014-10-29 | 浙江新安化工集团股份有限公司 | Method for preparing tripolyphosphate and hexametaphosphate products by using byproduct pyrophosphate |
| CN104477864A (en) * | 2014-12-22 | 2015-04-01 | 什邡圣地亚化工有限公司 | Technology for producing phosphate from pyrophosphate |
| CN104891466A (en) * | 2015-05-14 | 2015-09-09 | 湖北兴发化工集团股份有限公司 | Production method of instant food-grade sodium pyrophosphate |
| CN106335889A (en) * | 2016-08-18 | 2017-01-18 | 宜宾天原集团股份有限公司 | Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399598A (en) * | 2018-12-28 | 2019-03-01 | 湖北泰盛化工有限公司 | A kind of method that the purification of crude product sodium pyrophosphate produces sodium pyrophosphate and sodium chloride |
| CN109399598B (en) * | 2018-12-28 | 2021-08-10 | 湖北泰盛化工有限公司 | Method for producing sodium pyrophosphate and sodium chloride by purifying crude sodium pyrophosphate |
| CN111646448A (en) * | 2020-05-26 | 2020-09-11 | 宜宾天原海丰和泰有限公司 | Method for preparing food-grade sodium pyrophosphate from glyphosate byproduct crude sodium pyrophosphate |
| CN112161259A (en) * | 2020-10-10 | 2021-01-01 | 镇江江南化工有限公司 | Method for reducing energy consumption in production of crude sodium pyrophosphate and directional conversion device thereof |
| CN115124014A (en) * | 2022-06-17 | 2022-09-30 | 灵宝市民生高新材料有限公司 | Preparation method of zinc pyrophosphate |
| CN115124014B (en) * | 2022-06-17 | 2023-09-22 | 灵宝市民生高新材料有限公司 | Preparation method of zinc pyrophosphate |
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