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A kind of preparation method of sodium phosphate

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

Active Publication Date: 2018-02-23
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 the co...

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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Abstract

The invention discloses a method for preparing sodium phosphate salt. Sodium pyrophosphate is used as a raw material, mixed with wet-process phosphoric acid for hydrolysis reaction to obtain sodium orthophosphate, and then purified wet-process phosphoric acid is added to obtain disodium phosphate and / or Trisodium phosphate can be polymerized to obtain sodium tripolyphosphate. The preparation method of the novel sodium phosphate salt provided by the invention is a new method for producing the sodium phosphate salt product by using the by-product crude sodium pyrophosphate and sodium hydroxide as main raw materials and adopting a high-temperature and high-pressure hydrolysis process produced by the production of glufosinate. The characteristics of this technology are that the production process is easy to control, the product quality is stable, and the production cost is 35‑45% lower than that of traditional technology.

Description

technical field [0001] The invention relates to a preparation method of sodium phosphate salt, belonging to the field of inorganic chemistry. Background technique [0002] Sodium salt is a major branch of my country's chemical industry. Industrial-grade disodium phosphate and trisodium phosphate are one of the important product series in the phosphate industry. Due to their special properties, they are widely used in modern industry, medicine, food, agriculture and animal husbandry, Petroleum, paper, detergent, ceramics and other fields. [0003] Due to the wide application of sodium phosphate products and the large market demand, it is mainly produced by thermal phosphoric acid, that is, yellow phosphorus industrial grade 85% acid plus soda ash, and neutralization method. All dozens of production enterprises in my country now use this technology for production. this product. The production process of this technology is seriously polluted during the neutralization process of...

Claims

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Application Information

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Patent Type & Authority Patents(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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