Method for preparing industrial-grade and food-grade phosphoric acid by emulsification extraction and purification of wet-process phosphoric acid

A wet-process phosphoric acid, industrial-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high price of barium carbonate/barium hydroxide, fine barium sulfate particles, and increased product cost, and achieves economical efficiency. The effect of removing the filtration and separation process, shortening the production cycle and improving the utilization rate

Active Publication Date: 2014-10-15
成都富鼎鑫瑞科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two patents have the following disadvantages: ① Desulfurization and defluorination pretreatment and secondary desulfurization and defluorination treatment are required before extraction, which consumes a long time, and the sulfate content is reduced before extraction, thereby directly reducing the extraction process. The extraction rate of phosphorus pentoxide; ② deep desulfurization of the extracted organic phase after the extraction process, the price of barium carbonate / barium hydroxide consumed in this step is relatively high, and the particles of barium sulfate are extremely small, and solid-liquid separation is very difficult; ③ the above If the method described in the patent adopts conventional extraction methods, such as extraction, washing and stripping with a mixing and settling tank or a vibrating sieve plate column, a longer residence time, a larger device, and a large part of the extraction agent are required. Only by circulating in the system can the normal operation of the device be maintained, resulting in an increase in product cost

Method used

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  • Method for preparing industrial-grade and food-grade phosphoric acid by emulsification extraction and purification of wet-process phosphoric acid
  • Method for preparing industrial-grade and food-grade phosphoric acid by emulsification extraction and purification of wet-process phosphoric acid
  • Method for preparing industrial-grade and food-grade phosphoric acid by emulsification extraction and purification of wet-process phosphoric acid

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Embodiment 1

[0027] Embodiment 1: Preparation of technical grade phosphoric acid

[0028] In the present embodiment, the composition of raw material wet-process phosphoric acid used is as follows:

[0029]

[0030] Process steps such as figure 1 As shown, the sequence is primary decolorization, emulsification extraction, emulsification washing, emulsification stripping, arsenic and heavy metal removal, secondary decolorization, and concentration adjustment.

[0031] (1) One decolorization

[0032] The primary decolorization process is carried out in a primary decolorization tank, the decolorizing agent is ozone, the addition amount is 0.3% of the mass of phosphoric acid, the reaction temperature is 50°C, and the reaction time is 40 min.

[0033] (2) Emulsion extraction

[0034] The emulsification extraction process extracts the phosphoric acid after primary decolorization, using the mixture of tributyl phosphate and kerosene as the extractant, the volume percentage of kerosene is 40%...

Embodiment 2

[0049] Embodiment 2: Preparation of food-grade phosphoric acid

[0050] In the present embodiment, the composition of raw material wet-process phosphoric acid used is as follows:

[0051]

[0052] Process steps such as figure 1 As shown, the sequence is primary decolorization, emulsification extraction, emulsification washing, emulsification stripping, concentration, de-arsenic and heavy metal removal, secondary deep decolorization, defluorination and concentration adjustment.

[0053] (1) One decolorization

[0054] The primary decolorization process is carried out in a primary decolorization tank, the decolorant is ozone, the addition amount is 3% of the mass of phosphoric acid, the reaction temperature is 60°C, and the reaction time is 10 min.

[0055] (2) Emulsion extraction

[0056] The emulsification extraction process extracts the phosphoric acid after a decolorization, using the mixture of tributyl phosphate and kerosene as the extractant, the volume percentage o...

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Abstract

The invention provides a method for preparing industrial-grade phosphoric acid by an emulsification, extraction and purification wet method. The method comprises the sequential process steps of primary de-coloring, emulsification and extraction, emulsification and washing, emulsification and reverse extraction, concentration, dearsenification and heavy metal removing, secondary deep de-coloring and concentration adjustment. A method for food-grade phosphoric acid by the emulsification, extraction and purification wet method comprises the sequential process steps of primary de-coloring, emulsification and extraction, emulsification and washing, emulsification and reverse extraction, concentration, dearsenification and heavy metal removing, secondary deep de-coloring, defluorination and concentration adjustment. The emulsification and extraction step comprises the following steps of: agitating at normal pressure and at a temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r / min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r / min; the emulsification and washing step comprises the following steps of: agitating at the normal pressure and at the temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r / min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r / min; and the emulsification and reverse extraction step comprises the following steps of: agitating at the normal pressure and at the temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r / min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r / min.

Description

technical field [0001] The invention belongs to the preparation method of industrial-grade phosphoric acid and food-grade phosphoric acid, in particular to a method for preparing industrial-grade and food-grade phosphoric acid by purifying wet-process phosphoric acid with an emulsification extraction method. Background technique [0002] The preparation of industrial-grade phosphoric acid and food-grade phosphoric acid can use hot-process phosphoric acid or wet-process phosphoric acid as raw material. Due to the high pollution and high energy consumption of thermal phosphoric acid production, the use of wet process phosphoric acid to produce industrial-grade phosphoric acid and food-grade phosphoric acid has attracted more and more attention. At home and abroad, the research on the purification of wet-process phosphoric acid by solvent extraction has not stopped, and great progress has been made. Chinese patent ZL03117850.2 discloses a method for preparing industrial-grade ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/46
Inventor 李维王一明周宏斌
Owner 成都富鼎鑫瑞科技股份有限公司
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