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Method for producing disodium hydrogen phosphate by using phosphoric acid and sodium sulfate as raw material

A technology of disodium hydrogen phosphate and sodium ammonium hydrogen phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of high production cost and achieve the effect of cost saving

Active Publication Date: 2010-10-27
HUBEI XINGFA CHEM GRP CO LTD
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  • Abstract
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Problems solved by technology

[0002] The current method of producing disodium hydrogen phosphate is mainly to use phosphoric acid and soda ash to carry out two-stage neutralization reaction. Although the process route is short, the production cost is high

Method used

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Embodiment Construction

[0006] Concrete implementation process of the present invention is as follows:

[0007] A kind of method that is raw material production disodium hydrogen phosphate with phosphoric acid and sodium sulfate, it may further comprise the steps:

[0008] 1. Add phosphoric acid and sodium sulfate according to the molar ratio of 1:1.6~2.4, add ammonia water with a mass percentage of 26%~28% under constant stirring, adjust the pH to greater than 8.0, cool to 15°C~25°C to crystallize, filter and wash , to obtain crystals and filtrate;

[0009] 2H 3 PO 4 +Na 2 SO 4 +4NH 3 ·H 2 O===2NaNH 4 HPO 4 +(NH 4 ) 2 SO 4 +4H 2 o

[0010] 2. Calcination of crystals: add soda ash to the obtained crystals according to the molar ratio of elements Na:P=2:1, mix well, and react at a temperature of 180°C to 250°C for 1 hour to obtain disodium hydrogen phosphate, ammonia and carbon dioxide. The ammonia and carbon dioxide produced are absorbed by phosphoric acid and returned to step 1 for re...

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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 [0001] The invention relates to a method for producing disodium hydrogen phosphate, in particular to a method for producing disodium hydrogen phosphate with phosphoric acid and sodium sulfate as raw materials. Background technique [0002] The method for producing disodium hydrogen phosphate now mainly is to utilize phosphoric acid and soda ash to carry out two-stage neutralization reaction to generate, though the process route is short, the production cost is high. Contents of the invention [0003] The purpose of the present invention will provide a kind of method that is raw material production disodium hydrogen phosphate with phosphoric acid and sodium sulfate, and this method process flow is short, and equipment is simple, is easy to operate, and is easy to realize suitability for industrialized production. [0004] The object of the present invention is achieved like this: a kind of method that uses phosphoric acid and sodium sulfate as raw material t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30
Inventor 李琴余有平汤明友张永萍
Owner HUBEI XINGFA CHEM GRP CO LTD
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