Production process of disodium hydrogen phosphate

A technology of disodium hydrogen phosphate and sodium ammonium hydrogen phosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high production cost, and achieve the effect of reduced production cost and simple process

Active Publication Date: 2008-06-18
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current method of producing disodium hydrogen phosphate is to use phosphoric acid to react with soda ash. Although the production process is simple, the production cost is high

Method used

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Examples

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Embodiment Construction

[0014] A method for producing disodium hydrogen phosphate, it comprises the following steps:

[0015] a. Neutralization and purification of wet-process phosphoric acid: add ammonia water to wet-process phosphoric acid for neutralization, and then desulfurize with barium carbonate. Metal impurities in wet-process phosphoric acid will precipitate in the form of phosphate or hydroxide, and sulfate will be difficult to form Dissolved barium sulfate is precipitated and filtered to obtain a mixed solution of pure monoammonium phosphate and diammonium phosphate;

[0016] 2H 3 PO 4 +3NH 3 =NH 4 h 2 PO 4 +(NH 4 ) 2 HPO 4

[0017] mn + +nOH - =M(OH) n ↓2M n+ +nHPO 4 2- = M 2 (HPO 4 ) n ↓

[0018] b. Crystallization and separation of sodium ammonium hydrogen phosphate: add sodium chloride to the mixed solution of monoammonium phosphate and diammonium phosphate generated in step a, adjust the pH to 8 with soda ash, and filter and wash after cooling to 15°C to obtain sod...

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Abstract

The present invention discloses production process of disodium hydrogen phosphate. The disodium hydrogen phosphate producing process includes the steps of: neutralization and purification of wet process phosphoric acid, crystallization and separation of ammonium sodium phosphate, and decomposition of ammonium sodium phosphate. The present invention produces disodium hydrogen phosphate with cheap wet process phosphoric acid and sodium chloride, can purify wet process phosphoric acid effectively and lower the production process of disodium hydrogen phosphate greatly, and is simple and suitable for producing industrial level disodium hydrogen phosphate.

Description

technical field [0001] The invention relates to a method for producing disodium hydrogen phosphate, in particular to a method for producing disodium hydrogen phosphate by reacting wet-process phosphoric acid and sodium chloride. Background technique [0002] The method for producing disodium hydrogen phosphate is to utilize phosphoric acid and soda ash to react to generate now, although the production process is simple, the production cost is high. Contents of the invention [0003] The purpose of this invention is to provide a kind of method of producing disodium hydrogen phosphate, it utilizes wet-process phosphoric acid and sodium chloride to replace phosphoric acid and a part of soda ash in the existing process production respectively, the cost of producing disodium hydrogen phosphate is greatly reduced . [0004] The object of the present invention is achieved like this: a kind of method of producing disodium hydrogen phosphate, it may further comprise the steps: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30
Inventor 余有平邓小雄
Owner HUBEI XINGFA CHEM GRP CO LTD
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