Method for producing high-quality polyphosphoric acid

A technology of polyphosphoric acid and production method, applied in directions such as phosphorus oxyacid, condensed phosphoric acid, etc., can solve problems such as not reporting arsenic content, not reporting polyphosphoric acid concentration, not reporting polyphosphoric acid production, and achieving high production efficiency , The effect of stable production system

Active Publication Date: 2014-05-28
BLACK P2 USA INC
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Problems solved by technology

[0018] In addition, the "polyphosphoric acid dearsenic process" published by the patent CN201010207444.4 points out that the dearsenic is removed by adding sulfide to the (poly)phosphoric acid solution, but the patent does not report the concentration of polyphosphoric acid capable of dearsenic, There is no report on the production of polyphosphoric acid, let alone how low the arsenic content in the polyphosphoric acid product after arsenic removal can reach

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  • Method for producing high-quality polyphosphoric acid

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[0025] The implementation steps of the present invention will be further described in detail below in conjunction with specific examples, so as to facilitate a clearer understanding of the purpose, technical solutions and advantages of the present invention. It is necessary to point out here that the specific examples described below are only used to further illustrate the present invention, and should not be interpreted as limiting the protection scope of the present invention. Essential improvements and adjustments, or replacement of some equipment with similar equipment, examples are as follows:

[0026] In the first step, the yellow phosphorus enters the combustion furnace stably from the yellow phosphorus storage tank at a rate of 80 kg / min, and the natural air also continuously and stably enters the combustion furnace under the action of the large fan installed at the rear of the production system. Phosphorus pentoxide flue gas is generated after the combustion reaction ...

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Abstract

The invention belongs to the technical field of hot-process phosphoric acid production in the inorganic chemical industry and relates to a method for producing a high-quality polyphosphoric acid. The method is capable of further improving the advancement of the polyphosphoric acid production process and the quality of the obtained product, and as a result, the concentration of the obtained polyphosphoric acid product, converted into the content of orthophosphoric acid, ranges from 100% to 116%, and the content of arsenic in impurities contained in the obtained polyphosphoric acid product is low to the concentration range from 0.1ppm to 1.9ppm; in implementation, the production method comprises the major process steps of burning yellow phosphorus with air in a combustion furnace to generate phosphorus pentoxide flue gas, enabling the phosphorus pentoxide flue gas to enter a hydration-polymerization tower and react to generate the polyphosphoric acid, and carrying out arsenic removal and filtering by virtue of hydrogen sulfide gas, and then carrying out treatments such as color modulation on the polyphosphoric acid obtained through filtering to obtain the finished product.

Description

technical field [0001] The invention belongs to the technical field of thermal phosphoric acid production in the inorganic chemical industry, and relates to a production method of high-quality polyphosphoric acid. Background technique [0002] Polyphosphoric acid is a product with high added value among phosphorus chemical products. It is a relatively new type of chemical raw material. Its main components are orthophosphoric acid, tripolyphosphoric acid, pyrophosphoric acid, tetrapolyphosphoric acid and high polyphosphoric acid. Molecular formula: H (n+2) P n o (3n+1) ; [0003] Structural formula: [0004] Typical product molecular formula: H 6 P 4 o 13 . The phosphoric acid content of polyphosphoric acid is generally 105-115%H 3 PO 4 , including P 2 o 5 Greater than 76%. Polyphosphoric acid has a low viscosity and freezing point, so it is not easy to crystallize in winter, and it remains liquid when stored at low temperature, and is less corrosive. It can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/24
Inventor 林明印华亮
Owner BLACK P2 USA INC
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