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Method for high-efficiency concentration and dechlorination of phosphoric acid

A chlorophosphoric acid, high-efficiency technology, applied in chemical instruments and methods, separation methods, phosphorus compounds, etc., can solve the problems of low production capacity and low concentration efficiency, and achieve the effect of high production capacity and high concentration efficiency

Active Publication Date: 2021-12-24
成都市科隆化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: aim at the above existing problems, provide a method for high-efficiency concentration and removal of chlorophosphoric acid, by adopting the high-vacuum low-temperature thin-film evaporation process of the present invention, not only the concentration efficiency of the traditional decompression concentration process is solved low production capacity, and in the concentration process, the chloride removal rate has reached the product requirements, and the purpose of purifying phosphoric acid has been achieved, and the technical advantages are obvious

Method used

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  • Method for high-efficiency concentration and dechlorination of phosphoric acid
  • Method for high-efficiency concentration and dechlorination of phosphoric acid
  • Method for high-efficiency concentration and dechlorination of phosphoric acid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 and figure 2 As shown, a high-efficiency concentration system for concentration and removal of chlorinated phosphoric acid, which includes:

[0028] The first-stage thin-film concentration system 1 is used for evaporating and concentrating phosphoric acid. The first-stage thin-film concentration system 1 is formed by connecting two thin-film concentrators 3 in series to form a first-stage thin-film concentrator 101 and a second-stage thin-film concentrator 102. The first-stage thin-film concentrator The material outlet of 101 and the material inlet of the secondary membrane concentrator 102 are connected through the feed joint 2 to realize series connection; the material delivery pipeline 4 is connected to the feed joint 2 to transport phosphoric acid to the primary membrane concentration system 1;

[0029] The vacuum system is used to draw a vacuum to the primary film concentration system 1. The vacuum system includes a vacuum pump (not shown in the ...

Embodiment 2

[0037] This embodiment is the same as Embodiment 1, and the difference is that the first-stage thin-film concentration system 1 also includes a third-stage thin-film concentrator 103, such as image 3 As shown, the third-stage thin-film concentrator 103 is directly connected in series with the second-stage thin-film concentrator 102. By performing secondary evaporation and concentration on the material (dilute phosphoric acid), the evaporation concentration efficiency and evaporation concentration effect of the first-stage thin-film concentration system 1 can be improved.

Embodiment 3

[0039] Embodiment 3 is the same as Embodiment 2, and its difference is that, on the material delivery pipeline 4 that described final product reactor 7 is connected with primary reactor 6, there is final product film concentrator 8 connected in series, as Figure 4 As shown, the final product membrane concentrator is used to regulate the temperature of phosphoric acid.

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Abstract

The invention discloses a method for high-efficiency concentration and dechlorination of phosphoric acid. The method comprises the following steps: S1, dilute phosphoric acid is sent into a first-stage film concentration system, and high-vacuum low-temperature evaporation concentration is performed, wherein the high vacuum degree is -0.09 MPa or below, the low temperature is 110 DEG C or below, the first-stage film concentration system is formed by connecting at least two film concentrators in series, a first-stage film concentrator and a second-stage film concentrator are respectively formed, and the dilute phosphoric acid enters the second-stage film concentrator through a material joint; and S2, low-boiling-point materials obtained after evaporation and concentration enter the first-stage film concentrator, and high-boiling-point materials are collected through a first-stage reaction kettle. The film concentrators are adopted to carry out evaporation concentration treatment on the dilute phosphoric acid, so that the dilute phosphoric acid can be efficiently concentrated, the productivity is high, hydrogen chloride in the phosphoric acid can be removed, the method is particularly suitable for evaporation concentration treatment of electronic-grade phosphoric acid, the concentration of the treated phosphoric acid can reach 99% or above, and the chlorine content in the phosphoric acid is not larger than 10 ppm.

Description

technical field [0001] The invention relates to the field, in particular to a method for high-efficiency concentration and removal of chlorophosphoric acid. Background technique [0002] Phosphoric acid is a colorless viscous liquid or a colorless orthorhombic crystal. The content (purity) of commercially available products is generally 85%. Phosphoric acid with a concentration higher than this crystallizes when cooled, but has a low melting point (42.3°C). Reagent grade phosphoric acid is mainly used as analytical reagent (determination of iron and vanadium, etc.), electroplating polishing agent, catalyst for organic synthesis, desiccant for intermediate production, coagulant for latex, etc. Industrial grade phosphoric acid is often processed by sulfuric acid and apatite It is obtained by double decomposition, and the preparation process of large quantities of reagent-grade phosphoric acid is as follows: red phosphorus or white phosphorus is burned → pure water absorbs phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C01B25/234B01D1/22B01D1/30
CPCC01B25/2372C01B25/2346B01D1/22B01D1/30Y02P20/10
Inventor 王永生张松赵绍益吴进宏彭伟闫伟张碧元姚国峰张仕君吴秀英植利军吴晓玲傅建刘林
Owner 成都市科隆化学品有限公司
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