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Method for synthesizing polyphosphoric acid by taking wet-process purified phosphoric acid and phosphoric acid anhydride as raw materials

A wet purification and polyphosphoric acid technology, applied in the field of phosphorus chemical industry, can solve the problems of high requirements on material and sealing performance, difficult to clean, affecting the start-up of polyphosphoric acid production, etc. Effect

Active Publication Date: 2014-03-19
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, this method requires a temperature of 800-1000°C and a vacuum of 0.1-0.3 atm, which requires high material and sealing performance of the device. It is difficult to clean the inner wall of the device after fouling occurs, which affects the production and start-up of polyphosphoric acid.

Method used

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  • Method for synthesizing polyphosphoric acid by taking wet-process purified phosphoric acid and phosphoric acid anhydride as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 150g of phosphorus pentoxide in a three-necked flask at one time, slowly add 100g of wet-process purified phosphoric acid with a mass fraction of 76%, and keep stirring to dissolve the phosphorus pentoxide powder as much as possible, and then fix the three-necked flask on the oil bath Here, set the temperature of the collector-type constant temperature heating magnetic stirrer at 150°C, and the speed at 225 rpm to fully mix the materials. After the temperature rises to the set temperature, add the viscosity reducer tall oil with a mass concentration of 0.01%, and keep the temperature constant After 4 hours of polymerization reaction, the phosphorus pentoxide powder was completely dissolved to obtain a colorless and fluid transparent polyphosphoric acid with a mass concentration of phosphoric acid of 116%.

Embodiment 2

[0018] Put 150g of phosphorus pentoxide in a three-necked flask at one time, slowly add 85g of wet-process purified phosphoric acid with a mass fraction of 74%, and keep stirring to dissolve the phosphorus pentoxide powder as much as possible, and then fix the three-necked flask on the oil bath Here, set the temperature of the collector type constant temperature heating magnetic stirrer to 100°C, and the speed to 225 rpm to fully mix the materials. After the temperature rises to the set temperature, add the viscosity reducer tributyl phosphate with a mass concentration of 0.02%. After constant temperature polymerization for 5 hours, the phosphorus pentoxide powder was completely dissolved to obtain a colorless and fluid transparent polyphosphoric acid with a mass concentration of phosphoric acid of 116%.

Embodiment 3

[0020] Put 150g of phosphorus pentoxide in a three-necked flask at one time, slowly add 60g of phosphoric acid with a mass fraction of 78% wet method, and keep stirring to dissolve the phosphorus pentoxide powder as much as possible, and then fix the three-necked flask in an oil bath , set the temperature of the collector type constant temperature heating magnetic stirrer to 140 ° C, and the speed to 225 rpm to fully mix the materials. After the temperature is raised to the set temperature, add 0.03% viscosity reducer tannin to perform constant temperature polymerization. After 6 hours, the phosphorus pentoxide powder was completely dissolved to obtain a colorless and fluid transparent polyphosphoric acid with a mass concentration of phosphoric acid of 115%.

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Abstract

The invention relates to a method for synthesizing polyphosphoric acid by taking wet-process purified phosphoric acid and phosphoric acid anhydride as raw materials, belonging to the technical field of phosphorous chemical industry. The method is characterized by comprising the following steps: placing phosphorus pentoxide into a three-neck flask at one time, slowly adding the wet-process purified phosphoric acid, continuously stirring to ensure that the phosphorus pentoxide is dissolved as much as possible, and setting the temperature and the rotating speed of a heat-collection type constant temperature heating magnetic stirrer so as to sufficiently mix materials; and after the materials are uniformly mixed, heating to a reset temperature, adding a dispersant, and carrying out polymerization reaction at constant temperature for 2-6 hours to obtain the colorless flowing transparent polyphosphoric acid of which the mass concentration of the phosphoric acid 114-120 percent. The method disclosed by the invention has the advantages that the production energy consumption of the polyphosphoric acid is greatly reduced as the wet-process purified acid is used as a raw material; the method is safe and simple to operate and has good generalization practicability.

Description

technical field [0001] The invention relates to a method for synthesizing polyphosphoric acid by using wet-purified phosphoric acid and phosphoric anhydride as raw materials. The invention belongs to the technical field of phosphorus chemical industry. Background technique [0002] The existing basic raw material acid of phosphorus chemical industry is mainly industrial phosphoric acid, and its industrial production mainly includes two routes of thermal method and wet method. The thermal route oriented to yellow phosphorus has the characteristics of good product quality, low impurity content, and high price, and can be used for processing food-grade and electronic-grade phosphoric acid with high purity requirements; the wet route oriented to sulfuric acid dissolution has It has the characteristics of low cost and easy industrialization, but due to the high impurity content of phosphoric acid prepared by the wet route and the difficulty of purification process, it is limited...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/24
Inventor 何宾宾张晖阳杨李耀基方世祥陆伟才李小双刘俊
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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