Method for using phosphoric oxide to concentrate diluted phosphoric acid to prepare polyphosphoric acid

A technology of dilute phosphoric acid and polyphosphoric acid, which is applied in the field of polyphosphoric acid production, can solve the problems of high energy consumption, achieve energy saving, reduce production costs, and achieve significant social and economic benefits

Active Publication Date: 2009-09-16
WENGFU (GRP) CO LTD
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AI Technical Summary

Problems solved by technology

[0007] After research and practice, the inventor finds that if 85% phosphoric acid is concentrated by the acid anhydride method, the problem of high energy consumption can be solved: phosphoric anhydride is provided by burning yellow phosphorus, and the P obtained by burning yellow phosphorus 2 o 5 , one part is absorbed by wet 85% phosphoric acid cycle to obtain 95%-105% phosphoric acid; the other part is directly produced P 2 o 5 Products that can be sold directly as commodities or used to adjust the concentration of phosphoric acid that has not yet reached 100% to make it 100% phosphoric acid

Method used

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  • Method for using phosphoric oxide to concentrate diluted phosphoric acid to prepare polyphosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the purity 99.95%, containing arsenic 152 * 10 -6 The yellow phosphorus is fully melted at 70°C, according to 1kg of yellow phosphorus and 6.3~6.6m 3 The proportion of air, pump the yellow phosphorus to the yellow phosphorus burner and mix it with 0.7MPa compressed air, spray it into the phosphorus-burning boiler, and the yellow phosphorus is atomized rapidly in the phosphorus-burning boiler and burns violently.

[0023] P produced by combustion 2 o 5 Introduced into the top of the hydration tower, the top of the tower is sprayed with deionized water first, and then sprayed with dilute acid after obtaining dilute acid. Dilute phosphoric acid is continuously sprayed from the top and evenly overflows from the inner wall to absorb P in a circular manner. 2 o 5 , giving 116% H 3 PO 4 Finally, the top of the tower is supplemented with an appropriate amount of deionized water spraying to continue spraying, and 116% phosphoric acid is sent to the arsenic rem...

Embodiment 2

[0024] Embodiment 2 the purity 99.95%, arsenic content is 10 * 10 -6 The yellow phosphorus is fully melted at 70°C, according to 1kg of yellow phosphorus and 6.3~6.6m 3 The proportion of air, pump the yellow phosphorus to the yellow phosphorus burner and mix it with 0.7MPa compressed air, spray it into the phosphorus-burning boiler, and the yellow phosphorus is atomized rapidly in the phosphorus-burning boiler and burns violently.

[0025] P produced by combustion 2 o 5 Introduced into the top of the hydration tower, the top of the tower starts to be sprayed with 85% phosphoric acid, and evenly overflows from the inner wall to absorb P in a cycle 2 o 5 , giving 116% H 3 PO 4 Finally, add 85% phosphoric acid to the top of the tower in an appropriate amount, and continue to circulate and absorb to obtain P 2 o 5 The content is 72.42% polyphosphoric acid.

Embodiment 3

[0026] Embodiment 3: the purity 99.95%, arsenic content is 10 * 10 -6 The yellow phosphorus is fully melted at 70°C, according to 1kg of yellow phosphorus and 6.3~6.6m 3 The proportion of air, pump the yellow phosphorus to the yellow phosphorus burner and mix it with 0.8MPa compressed air, spray it into the phosphorus-burning boiler, and the yellow phosphorus is atomized rapidly in the phosphorus-burning boiler and burns violently.

[0027] P produced by combustion 2 o 5 Introduced into the top of the hydration tower, the top of the tower is sprayed with 85% purified wet-process phosphoric acid, and part of it overflows evenly from the inner wall to absorb P in a circular manner. 2 o 5 , giving 116% H 3 PO 4 Finally, add an appropriate amount of purified phosphoric acid to the top of the tower to continue spraying, and send 116% phosphoric acid to the arsenic removal device, add 0.5% phosphorus pentasulfide of the total weight of phosphoric acid, filter at a temperature o...

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Abstract

A method for using phosphoric oxide to concentrate diluted phosphoric acid to prepare polyphosphoric acid, including following steps: mixing yellow phosphorus and air with the proportion of 1kg yellow phosphorus to 6.3-6.6 m3, burning, absorbing the obtained P2O5 by diluted acid; applying the obtained phosphoric acid into a phosphoric acid groove; then using acid pump to send into a condenser to remove the heat; then sending the phosphoric acid into a hydration tower to circularly spray and absorb P2O5 to increase the concentrated phosphoric acid; cycling without stop to obtain the phosphoric acid having 82%-84% P2O5. The recovery coefficient of phosphorus is more than 98%. The obtained product reaches the standard of the food-level phosphoric acid. This invention may greatly reduce the cost of package and distribution of the phosphoric acid production enterprise via using the wet-method phosphoric acid or hot-method phosphoric acid of the concentrated content of the phosphoric acid anhydride of less than 100% obtained by yellow phosphorus burning. This invention does not need to consume the extra energy, and can fully use the burning heat and the hydration heat of the yellow phosphorus; the generated steam can be recycled. So this invention has the advantages of saving energy and greatly reducing the production cost of the polyphosphoric acid, with remarkable social and economic benefits.

Description

technical field [0001] The present invention relates to phosphorus and its oxides, and also to phosphoric acid, and more specifically, to a method for producing polyphosphoric acid. Background technique [0002] Phosphoric acid is a basic chemical raw material. The phosphorus sold in the market mainly has two specifications of 85% and 75%. [0003] There are many ways to produce phosphoric acid, mainly including wet process phosphoric acid and thermal process phosphoric acid. To obtain high-concentration phosphoric acid from wet-process phosphoric acid, it must be concentrated to remove the water. There are many ways to concentrate phosphoric acid, the main ones are: (1) direct heat transfer by external combustion (such as wet wall evaporation); (2) direct heat transfer by immersion combustion (such as Nordank immersion combustion concentration evaporation); (3) indirect heat transfer Thermal evaporation (eg Swenson forced circulation vacuum evaporator). These several me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/24
CPCY02P20/10
Inventor 何浩明王邵东李红林冉瑞泉杨光明吴邦文
Owner WENGFU (GRP) CO LTD
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