CN101462706B - Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material - Google Patents
Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material Download PDFInfo
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- CN101462706B CN101462706B CN 200810197996 CN200810197996A CN101462706B CN 101462706 B CN101462706 B CN 101462706B CN 200810197996 CN200810197996 CN 200810197996 CN 200810197996 A CN200810197996 A CN 200810197996A CN 101462706 B CN101462706 B CN 101462706B
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- phosphoric acid
- hydrogen phosphate
- disodium hydrogen
- sodium sulfate
- soda ash
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Abstract
The invention provides a method for preparing disodium hydrogen phosphate by taking phosphoric acid and sodium sulfate as raw materials. According to the mol ratio of1:1.6-2.4 , the phosphoric acid and the sodium sulfate are mixed and stirred and added with ammonia water with mass percentage of between 26 and 28 percent or liquid ammonia; the pH value of the system is adjusted to more than 8.0; the raw materials are subjected to cool crystallization at a temperature of between 15 and 25 DEG C, and filtered to obtain a dibastic sodium phosphate crystal and a filtrate; the dibastic sodium phosphate crystal is added with soda ash and evenly mixed, wherein the soda ash is added according to the mol ratio of Na: P element of 2, the dibastic sodium phosphate crystal and the soda ash react at a temperature of between 180 and 250 DEG C for one hour to obtain the disodium hydrogen phosphate; and the filtrate is subjected to condensation and crystallization to obtain ammonia sulfate. The methodhas the characteristics of saving cost and recycling the generated ammonia gas, and the disodium hydrogen phosphate product prepared by the method meets the requirements of the HG/T2965-2000 industrial disodium hydrogen phosphate index.
Description
Technical field
The present invention relates to a kind of method of producing Sodium phosphate dibasic, particularly a kind of is the method for raw material production Sodium phosphate dibasic with phosphoric acid and sodium sulfate.
Background technology
Producing the method for Sodium phosphate dibasic now, mainly is to utilize phosphoric acid and soda ash to carry out two sections neutralization reactions to generate, though operational path is short, and the production cost height.
Summary of the invention
Purpose of the present invention is exactly that will to provide a kind of be the method for raw material production Sodium phosphate dibasic with phosphoric acid and sodium sulfate, and this method technical process is short, and equipment is simple, is convenient to operation, is easy to realize suitability for industrialized production.
The object of the present invention is achieved like this: a kind of is the method for raw material production Sodium phosphate dibasic with phosphoric acid and sodium sulfate, is that 1: 1.6～2.4 amount is thrown in material with phosphoric acid and sodium sulfate according to mol ratio, stir, drip mass percent then and be 26%～28% ammoniacal liquor or liquefied ammonia, the pH value of regulation system is greater than 8.0, crystallisation by cooling, the crystallisation by cooling temperature is 15 ℃～25 ℃, filtration obtains sodium hydrogen phosphate crystalline ammonium and filtrate, in the sodium hydrogen phosphate crystalline ammonium, add soda ash and mix, wherein soda ash is according to Na: P element mol ratio is that 2 amount adds, reaction is 1 hour under 180 ℃～250 ℃ temperature, obtain Sodium phosphate dibasic, filtrate obtains ammonium sulfate by condensing crystal.
The present invention has the characteristics of the recyclable utilization of ammonia of saving cost, generation, reaches the requirement of HG/T 2965-2000 industrial phosphoric acid disodium hydrogen index with the Sodium phosphate dibasic product of present method production.
Embodiment
Specific implementation process of the present invention is as follows:
A kind of is the method for raw material production Sodium phosphate dibasic with phosphoric acid and sodium sulfate, and it may further comprise the steps:
1, phosphoric acid and sodium sulfate is according to 1: 1.6～2.4 mole missile material recently, stirs constantly that to add mass percent down be 26%～28% ammoniacal liquor, regulates pH greater than 8.0, is cooled to 15 ℃～25 ℃ crystallization and filtration washings, obtains crystallization and filtrate;
2H
3PO
4+Na
2SO
4+4NH
3·H
2O＝＝＝2NaNH
4HPO
4+(NH
4)
2SO
4+4H
2O
2, crystallization calcining: in the crystallization that obtains according to the mol ratio Na of element: P=2: 1 amount adds soda ash, after mixing, places under 180 ℃～250 ℃ temperature reaction 1 hour, obtains Sodium phosphate dibasic, ammonia and carbonic acid gas.The ammonia and the carbonic acid gas that produce absorb with phosphoric acid, return the 1st step recycle;
2NaNH
4HPO
4+Na
2CO
3＝＝＝2Na
2HPO
4+2NH
3↑+CO
2↑+H
2O↑
3, ammonium sulfate reclaims: the concentrating filter liquor that the 1st step obtained, and ammonium sulfate crystallization is separated out, and filters to obtain ammonium sulfate and mother liquor, and mother liquor returns the 1st step recycle.
For the ease of understanding the present invention, below examples of implementation set forth content of the present invention, content of the present invention is not limited only to the following examples
Phosphoric acid: phosphorus acid content 85.1%
Soda ash: soda ash content: 99.7%
Sodium sulfate: sodium sulphate content: 98.4%
Ammoniacal liquor: NH
3Percentage composition is 26%
Take by weighing phosphatase 11 00g in the 400ml beaker, add sodium sulfate 62g, add 100g water, add ammoniacal liquor 120g under constantly stirring, this moment, pH value of solution was 8.3, and temperature is 54 ℃, continues to stir 30 minutes.Be placed under 15 ℃ of environment and stirred 1 hour, have crystallization to separate out, filter and obtain crystal 190g, filtrate 180g, washing water 80g with the 70g water washing.
In the crystal that obtains, add soda ash 45g, be put in the rotatory evaporator after stirring, (annotate: this experiment is chosen 200 ℃ in 200 ℃, in 180～250 ℃ of scopes) evaporation 1 hour under the oil bath, the gas that produces absorbs with phosphoric acid, obtain white solid 115g at last, this white solid is a Sodium phosphate dibasic after testing.
Obtain Sodium phosphate dibasic quality situation:
| Project | Sodium phosphate dibasic (anhydrous) content % | Vitriol (in SO4) content % | Muriate (in Cl) content % | Water insoluble matter content % | pH |
| The result | 98.5 | 0.2 | 0.01 | 0.01 | 9.1 |
Above index reaches the requirement of technical grade salable product.
Claims (1)
1. one kind is the method for raw material production Sodium phosphate dibasic with phosphoric acid and sodium sulfate, it is characterized in that: is that 1: 1.6～2.4 amount is thrown in material with phosphoric acid and sodium sulfate according to mol ratio, stir, drip mass percent then and be 26%～28% ammoniacal liquor or liquefied ammonia, the pH value of regulation system is greater than 8.0, crystallisation by cooling, the crystallisation by cooling temperature is 15 ℃～25 ℃, filtration obtains sodium hydrogen phosphate crystalline ammonium and filtrate, add soda ash and mix in the sodium hydrogen phosphate crystalline ammonium, wherein soda ash is according to Na: P element mol ratio is that 2 amount adds, and reaction is 1 hour under 180 ℃～250 ℃ temperature, obtain Sodium phosphate dibasic, filtrate obtains ammonium sulfate by condensing crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810197996 CN101462706B (en) | 2008-11-28 | 2008-11-28 | Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810197996 CN101462706B (en) | 2008-11-28 | 2008-11-28 | Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material |
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| Publication Number | Publication Date |
|---|---|
| CN101462706A CN101462706A (en) | 2009-06-24 |
| CN101462706B true CN101462706B (en) | 2010-10-27 |
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| CN 200810197996 Active CN101462706B (en) | 2008-11-28 | 2008-11-28 | Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103864040B (en) * | 2013-05-08 | 2017-12-15 | 浙江悦瑞环保工程有限公司 | A kind of technique from glyphosate mother solution preparing phosphoric acid disodium hydrogen |
| CN104986747B (en) * | 2015-06-26 | 2017-03-22 | 江苏瑞升华能源科技有限公司 | Preparation method of dihydrate disodium hydrogen phosphate |
| CN105174237B (en) * | 2015-09-22 | 2018-03-13 | 贵州开磷集团股份有限公司 | A kind of phosphoric acid by wet process prepares sodium dihydrogen phosphate method |
| CN106430132A (en) * | 2016-11-04 | 2017-02-22 | 湖北三宁化工股份有限公司 | Method for preparing monopotassium phosphate and co-product ammonium sulfate by circulation method |
| CN112479172A (en) * | 2020-12-04 | 2021-03-12 | 上海天汉环境资源有限公司 | Production method of disodium hydrogen phosphate |
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