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Preparation process of high-purity phosphorus pentoxide

A phosphorus pentoxide and preparation technology, applied in the direction of phosphorus oxide, phosphorus compound, inorganic chemistry, etc., can solve the problems of raw material yellow phosphorus loss, sewage treatment, difficult to handle, etc., to achieve improved recovery rate and low cost , good economic and social benefits

Active Publication Date: 2019-03-15
中州新材料(杭州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the oxidation process, the raw material yellow phosphorus can become phosphorus pentoxide, and in this case, the phosphorus pentoxide reacts with water present in the reaction solution to become phosphoric acid, thereby causing the loss of the raw material yellow phosphorus; in addition, The method of using iodine, iodized salt, and iodic acid can effectively remove impurities such as antimony and arsenic because iodine compounds have very strong oxidizing power, but iodine, as a harmful substance, is difficult to handle in the process, and the reaction Afterwards there was a problem with sewage treatment
In addition, since iodide ions may remain in the raw material yellow phosphorus, side reactions may occur, so there is a problem that it is necessary to confirm the remaining iodide ions

Method used

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  • Preparation process of high-purity phosphorus pentoxide
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Examples

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Effect test

Embodiment 1

[0036] A preparation process for high-purity phosphorus pentoxide, comprising the steps of:

[0037] Ⅰ. Pretreatment of phosphorus sludge: Mix phosphorus sludge and deionized water at a mass ratio of 1:3, stir for 3 hours at 65°C and 1000r / min, then add 1mol / L hydrochloric acid solution to adjust the pH value to 4 , obtain the pretreated phosphorus sludge solution;

[0038] Ⅱ. Purification and removal of impurities: at 45°C and a working pressure of 0.207 MPa, use a 0.45 μm filter membrane to filter the treated phosphorus mud solution to obtain a filtrate; add 3% hydrogen peroxide to the filtrate mass , stirred at 50°C and 1000r / min for 25min, then added sodium hypochlorite with a solution mass of 5%, kept the temperature and rotational speed constant, continued to stir for 2h, then added nitrilotrimethylene phosphoric acid, diethylenetriamino Pentamethyl phosphoric acid, hexamethylene diamine tetramethylene phosphonic acid, the mass ratio of the solution, nitrilo trimethylen...

Embodiment 2

[0043] A preparation process for high-purity phosphorus pentoxide, comprising the steps of:

[0044] Ⅰ. Pretreatment of phosphorus sludge: Mix phosphorus sludge and deionized water at a mass ratio of 1:3, stir for 3 hours at 65°C and 1000r / min, then add 1mol / L hydrochloric acid solution to adjust the pH value to 4 , obtain the phosphorus mud solution after pH adjustment, then carry out ultrasonic treatment to the phosphorus mud solution after pH adjustment, the ultrasonic power of described ultrasonic treatment is 400W, ultrasonic frequency is 28kHz, and temperature is 50 ℃, and processing time 5h, then at 50 ℃ for 2 hours to obtain the pretreated phosphorus mud solution;

[0045] Ⅱ. Purification and removal of impurities: at 45°C and a working pressure of 0.207 MPa, use a 0.45 μm filter membrane to filter the treated phosphorus mud solution to obtain a filtrate; add 3% hydrogen peroxide to the filtrate mass , stirred at 50°C and 1000r / min for 25min, then added sodium hypochl...

Embodiment 3

[0050] A preparation process for high-purity phosphorus pentoxide, comprising the steps of:

[0051] Ⅰ. Phosphorus sludge pretreatment: Mix phosphorus sludge and deionized water at a mass ratio of 1:3, stir for 3 hours at 65°C and 1000r / min, then freeze at minus 20°C for 20h, and then Stand still at 25°C for 12 hours, add 1mol / L hydrochloric acid solution, adjust the pH value to 4, obtain the phosphorus mud solution after adjusting the pH, then carry out ultrasonic treatment to the phosphorus mud solution after adjusting the pH, the ultrasonic power of the ultrasonic treatment The ultrasonic frequency is 400W, the ultrasonic frequency is 28kHz, the temperature is 50°C, the treatment time is 5h, and then kept at 50°C for 2h to obtain the pretreated phosphorus mud solution;

[0052] Ⅱ. Purification and removal of impurities: at 45°C and a working pressure of 0.207 MPa, use a 0.45 μm filter membrane to filter the treated phosphorus mud solution to obtain a filtrate; add 3% hydrog...

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Abstract

The invention discloses a preparation process of high-purity phosphorus pentoxide. The preparation process of high-purity phosphorus pentoxide comprises the following steps: I, pretreatment of phosphorus mud; II, purification and impurity removal; III, pretreatment of yellow phosphorus; IV, pretreatment of air; V, preparation and cooling of high temperature flue gas. The preparation process of high-purity phosphorus pentoxide adopts simple preparation steps and is low in cost; the prepared product has high quality purity, is stable and reliable, does not contain raw material impurities such asarsenic, antimony, iron and aluminum, is pollution-free to the environment, is efficient, safe and economic, and has better economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation process of high-purity phosphorus pentoxide. Background technique [0002] Phosphorus pentoxide is an important chemical raw material and a good dehydrating agent. It is an important raw material for the production of phosphoric acid, polyphosphoric acid, polyphosphate, triethyl phosphate, and fine phosphorus chemical products. At present, the main method of producing phosphorus pentoxide in the chemical industry is the method of oxidizing yellow phosphorus. The yellow phosphorus is fully burned in dry air to obtain a high-temperature mixed gas containing phosphorus pentoxide. Phosphorus pentoxide is a relatively mature phosphorus chemical product in domestic and foreign markets. It is an intermediate product of phosphorus chemical industry directly produced from yellow phosphorus, and is the basic raw material for the production of fine chemical products....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/12C01B25/047C01B32/342C01B32/348C01B32/324
CPCC01B25/047C01B25/12C01B32/324C01B32/342C01B32/348
Inventor 陈文标
Owner 中州新材料(杭州)有限公司
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