Preparation method for phosphoric acid sodium salts

A technology of sodium phosphate salt and sodium pyrophosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of serious phosphoric acid pollution, high production cost, and alarming energy consumption, and reduce production cost and production cost Low, the effect of solving environmental worries

Active Publication Date: 2015-08-19
MIANYANG SHENLONG FEEDSTUFF CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this technology is seriously polluted during the neutralization process of yellow phosphorous thermal phosphoric acid as the main raw material, and the energy consumption is astonishing. It is a high energy consumption and high pollution industry, and the production cost is also very high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of sodium phosphate salt,

[0030] 1) Preparation of sodium orthophosphate

[0031] First add water to the crude sodium pyrophosphate and wash until the NaCl content is less than 1%, fully mix the crude sodium pyrophosphate, water and wet-process phosphoric acid, add impurity removal agent and decolorant agent, and carry out hydrolysis reaction at a temperature of 135°C by steam control. The pressure of the hydrolysis reaction is 0.2MPa, let it stand still, and when the hydrolysis is complete, the sodium pyrophosphate will completely react to generate sodium orthophosphate;

[0032] 2) Preparation of disodium phosphate and trisodium phosphate

[0033] After step 1) the obtained feed liquid is filtered to remove impurities (because the crude sodium pyrophosphate contains impurities such as carbon black, the dissolved liquid is filtered to remove impurities such as carbon black, and after the filtered carbon black is washed with a little wate...

Embodiment 2

[0043] A kind of preparation method of sodium phosphate salt,

[0044] 1) Preparation of sodium orthophosphate

[0045] First add water to the crude sodium pyrophosphate and wash until the NaCl content is less than 1%, fully mix the crude sodium pyrophosphate, water and wet-process phosphoric acid, add impurity removal agent and decolorizer, and carry out hydrolysis reaction at a temperature of 130°C controlled by steam. The pressure of the reaction is 0.2MPa. After the reaction, let stand until the hydrolysis is complete, and the sodium pyrophosphate reacts completely to generate sodium orthophosphate;

[0046] 2) Preparation of disodium phosphate and trisodium phosphate

[0047] Step 1) The obtained sodium orthophosphate salt feed liquid is filtered to remove impurities, added to purified wet-process phosphoric acid for further hydrolysis, and when the pH is adjusted to 7.5, the complete reaction forms disodium phosphate, and then cooled to less than 18°C ​​to obtain th...

Embodiment 3

[0058] A kind of preparation method of sodium phosphate salt,

[0059] 1) Preparation of sodium orthophosphate

[0060] First add water to the crude sodium pyrophosphate and wash until the NaCl content is less than 1%, fully mix the crude sodium pyrophosphate, water and wet-process phosphoric acid, add impurity removal agent and decolorant agent, and carry out hydrolysis reaction at a temperature of 140°C by steam control. The pressure of the hydrolysis reaction is 0.2MPa. After the reaction, let it stand still. After the hydrolysis is complete, the sodium pyrophosphate will completely react to generate sodium orthophosphate;

[0061] 2) Preparation of disodium phosphate and trisodium phosphate

[0062] Step 1) The obtained sodium orthophosphate salt feed liquid is filtered to remove impurities, and then purified wet-process phosphoric acid is added for further hydrolysis. When the pH is adjusted to 7.5, disodium phosphate is completely reacted, and when the pH is adjusted to...

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PUM

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Abstract

The invention discloses a preparation method for phosphoric acid sodium salts, wherein the preparation method comprises the steps: using sodium pyrophosphate as a raw material, carrying out a mixed hydrolysis reaction with wet-process phosphoric acid to obtain sodium orthophosphate, then adding purified wet-process phosphoric acid, adjusting the pH value to obtain disodium phosphate and / or trisodium phosphate, and next carrying out a polymerization reaction to obtain sodium tripolyphosphate. The novel preparation method for the phosphoric acid sodium salts is a new method adopting crude by-products sodium pyrophosphate and sodium hydroxide generated in Caoanning production as the main raw materials and adopting high-temperature and high-pressure hydrolysis process to produce the phosphoric acid sodium salt products. The preparation method is characterized in that the production process is easy to control, the product quality is stable, and the production cost is 35-45% lower than that of a traditional process.

Description

Technical field [0001] The present invention involves a method of preparing sodium phosphate, which is the field of inorganic chemistry. Background technique [0002] Sodium salt is a large branch of my country's chemical industry. Industrial -grade sodium phosphate and sodium are one of the important product series of phosphate industry. Due to its special nature, it is widely used in modern chemical industry, medicine, food, agriculture and animal husbandry, and Petroleum, papermaking, detergent, ceramic and other fields. [0003] Due to the extensive use of sodium phosphate products and large market demand, the main use of heat phosphate, which is 85%acidic and pure alkali, and produced in China. All dozens of production companies in my country use this technology to produce production production. This product.This technology production process is severely polluted during neutralization due to the main raw material yellow phosphorus heat phosphate used in the main raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/41
Inventor 罗云林于成龙钱萍张森樊青华
Owner MIANYANG SHENLONG FEEDSTUFF CO LTD
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