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Production method and device for purification of low-concentration wet-process phosphoric acid by solvent extraction

A wet-process phosphoric acid and production method technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low extraction rate of low-concentration phosphoric acid, long production technology process, low impurity removal rate, etc., to achieve Improve economic added value, good effect, and improve the effect of purification effect

Inactive Publication Date: 2019-06-25
广西川金诺化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a process technology for purifying wet-process phosphoric acid by solvent extraction in order to overcome the above-mentioned defects in the prior art. Low efficiency, low impurity removal rate, high production cost, solvent residue and other problems, reduce the production cost of food-grade phosphoric acid, realize the efficient utilization of wet-process phosphoric acid, and improve the economic benefits of wet-process phosphoric acid

Method used

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  • Production method and device for purification of low-concentration wet-process phosphoric acid by solvent extraction
  • Production method and device for purification of low-concentration wet-process phosphoric acid by solvent extraction
  • Production method and device for purification of low-concentration wet-process phosphoric acid by solvent extraction

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Embodiment 1

[0023] Embodiment 1: The technological process of 5000 tons / year purification wet-process phosphoric acid is as follows:

[0024] Concentration is 35wt%P 2 o 5 The raw material wet-process phosphoric acid is settled and filtered, and sodium carbonate is added to it, and at 65-85°C, the reaction generates Na 2 SiF 6 Precipitate and filter to obtain pretreated defluorinated raw phosphoric acid, which enters the raw acid tank of the purification section.

[0025] The pretreated raw material wet-process phosphoric acid and organic solvent (specific gravity 0.813) are metered by the pump respectively to control the two-phase phase ratio, and transported to the mixing chamber. At room temperature, the raw phosphoric acid and the organic solvent are fully mixed and contacted, and the phosphoric acid enters the organic phase to obtain an extracted organic phase with a specific gravity of 1.015, and most impurities enter the extraction acid. In the clarification chamber, the extrac...

Embodiment 2

[0028] Embodiment 2: embodiment 1: the technological process of 10000 tons / year purification wet-process phosphoric acid is as follows:

[0029] Concentration is 40wt%P 2 o 5 The raw material wet-process phosphoric acid is settled and filtered, and sodium carbonate is added to it, and at 70-90°C, the reaction generates Na 2 SiF 6 Precipitate and filter to obtain pretreated defluorinated raw phosphoric acid, which enters the raw acid tank of the purification section.

[0030] The pretreated raw material wet-process phosphoric acid and organic solvent (specific gravity 0.813) are metered by the pump respectively to control the two-phase phase ratio, and transported to the mixing chamber. At room temperature, the raw phosphoric acid and the organic solvent are fully mixed and contacted, and the phosphoric acid enters the organic phase to obtain an extracted organic phase with a specific gravity of 1.015, and most impurities enter the extraction acid. In the clarification cham...

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Abstract

The invention relates to a production method and device for purification of low-concentration wet-process phosphoric acid by solvent extraction. The technology utilizes solvent extraction to realize preparation of food-grade phosphoric acid from low-concentration wet-process phosphoric acid. The method adopts one or more of trioctyl phosphate, cyclohexanol, isooctyl alcohol, butyl ether, cyclohexanone, isobutyl acetate and ethylene glycol diethyl ether as the extraction agent; extraction, washing and reverse extraction are accomplished by a multistage static mixer; and in the washing process,the quaternary ammonium salt cation [N(CH3)4]<+> is added into a washing solution. The static mixer used in the invention is special equipment designed and developed by self according to the process requirements and practical production practice experience, and is the key production device of the invention. The method and equipment provided by the invention can be applied to the industrial production of food grade phosphoric acid from wet-process phosphoric acid, and can significantly shorten the purification process, reduce consumption and ultimately lower the purification cost of the whole process.

Description

technical field [0001] The invention relates to a wet-process phosphoric acid purification production process, in particular to a process method and a purification device for producing food-grade phosphoric acid from low-concentration wet-process phosphoric acid through solvent extraction. Background technique [0002] The production cost of wet-process phosphoric acid is lower, but the impurity content is higher. In the past few decades, the purification technologies for wet-process phosphoric acid have been increasing, mainly including organic solvent extraction, chemical precipitation, ion exchange, physical adsorption and crystallization. Among them, the solvent extraction method has gradually been recognized by people, and has been widely used in industrial applications. In the book "Modern Phosphorus Chemical Technology and Application", the author introduces in detail several major solvent extraction methods at home and abroad to prepare and purify wet-process phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234C01B25/46
Inventor 张笑盈冯孟黎罗蜀峰孙位成
Owner 广西川金诺化工有限公司
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