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Method for purifying ferric trichloride

A technology of ferric chloride and a purification method, applied in directions such as the preparation of ferric halide and iron compounds, can solve the problems of limiting the application field of ferric chloride, unfavorable purification, single extraction characteristics of iron ions, etc., and achieves cost reduction and maintenance. Purity, volatile effect

Pending Publication Date: 2021-04-16
3R ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used methods for the purification of iron-containing chlorides currently disclosed include five processes: recrystallization, replacement of impurity metals with elemental iron, reduction of solution acidity so that impurity metals form hydroxide precipitation, sulfide metal removal, and extraction. The first four purification methods It is necessary to screen low-impurity raw materials to improve the purity of subsequent products and reduce purification costs. There are many commonly used iron extractants, but few of them show a single extraction characteristic for iron ions, which is very unfavorable for purification, and Most extractants (such as tributyl phosphate) or diluents (such as benzene, toluene) have certain toxicity, which limits the application fields of subsequent ferric chloride products

Method used

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  • Method for purifying ferric trichloride
  • Method for purifying ferric trichloride
  • Method for purifying ferric trichloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for purifying ferric chloride, comprising the following steps:

[0030] S1. 1kg ferrous chloride solution A 0 Chlorine gas was introduced to make the Fe in the solution 2+ Oxidation is complete to obtain ferric chloride solution;

[0031] S2. Add 3kg of industrial hydrochloric acid and 2kg of butyl acetate to the ferric chloride solution, vibrate, let stand until the layers are complete, and take the organic layer;

[0032] S3. Add 1 kg of pure water to the organic layer for back extraction to obtain ferric chloride with ultra-low impurity content, and return the organic layer to the system for recycling;

[0033] S4. Evaporate ferric chloride to boiling for 10 minutes to obtain high-purity ferric chloride A.

[0034] The experimental data are shown in the table below.

[0035]

Embodiment 2

[0037] A method for purifying ferric chloride, comprising the following steps:

[0038] S1. 2kg ferrous chloride solution A 0 Chlorine gas was introduced to make the Fe in the solution 2+ Oxidation is complete to obtain ferric chloride solution;

[0039] S2. Add 1kg of ferric chloride solution to 3kg of industrial hydrochloric acid and 2kg of butyl acetate, vibrate, let stand until the layers are complete, and take the organic layer;

[0040] S3 Add 1 kg of ferric chloride and 3 kg of industrial hydrochloric acid to the organic layer obtained in S2, oscillate and stand until the layers are complete, and take the organic layer;

[0041] Add 1kg pure water in S4 organic layer and carry out stripping, obtain the iron trichloride B of low impurity content 1 , adding 1kg of pure water to the organic layer for stripping, to obtain iron trichloride C with ultra-low impurity content 1 , the organic layer is returned to the extraction system for recycling;

[0042] S4. Ferric tric...

Embodiment 3

[0046]A method for purifying ferric chloride, comprising the following steps:

[0047] S1. 1kg ferrous chloride solution A 0 Add appropriate amount of sodium chlorate and hydrochloric acid to make Fe in the solution 2+ Oxidation is complete to obtain ferric chloride solution;

[0048] S2. Add 2kg of industrial hydrochloric acid and 1kg of butyl acetate to the ferric chloride solution, vibrate and let stand until the layers are complete, then take the organic layer;

[0049] S3. Add 1 kg of pure water to the organic layer for back extraction to obtain ferric chloride with ultra-low impurity content, and return the organic layer to the system for recycling;

[0050] S4. Evaporate ferric chloride to boiling for 15 minutes to obtain high-purity ferric chloride D.

[0051] The experimental data are shown in the table below.

[0052]

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Abstract

The invention discloses a purification method of ferric trichloride, which comprises the following steps: oxidizing iron-containing chloride into ferric trichloride, adding industrial hydrochloric acid and butyl acetate, extracting, standing for layering, taking an organic phase, adding a stripping agent, carrying out reverse extraction to obtain ferric trichloride with ultralow impurity content, evaporating, concentrating, and removing organic matters to obtain high-purity ferric trichloride. Recyclable organic phase. The purification process is not limited by the purity of production raw materials, is simple to operate and low in equipment investment, and does not use toxic extractant. The ferric trichloride product produced by the process disclosed by the invention can be applied to the fields of drinking water treatment, medical intermediates, analytical testing, precision etching and the like.

Description

technical field [0001] The invention relates to the technical field of compound purification, in particular to a method for purifying ferric chloride. Background technique [0002] Ferric chloride is a very important iron salt, mainly used in metal etching, sewage treatment, printing and dyeing drum engraving, electronic industry circuit boards, construction industry for the preparation of concrete, inorganic industry for the manufacture of other iron salts and inks, In the dye industry, it is used as an oxidant in the dyeing of Indicosol dyes, in the organic industry, it is used as a catalyst, oxidant and chlorinating agent, etc. [0003] Ferric chloride, which requires high purity, is mainly used in drinking water treatment, pharmaceutical intermediates, analysis and testing, precision etching and other fields. Various countries and industries have different requirements for the purity of ferric chloride according to different uses, and put forward different index require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10
CPCC01G49/10C01P2006/80C01G49/0009
Inventor 车莹何开景梁锦华梁茂杰陈海雄
Owner 3R ENVIRONMENTAL TECH CO LTD
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