Comprehensive utilization method of arsenious waste hydrochloric acid

A technology of waste hydrochloric acid and benzylarsinic acid is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., to achieve the effects of low production costs, improved economic benefits, and solutions to environmental problems

A technology of waste hydrochloric acid and benzylarsinic acid is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., to achieve the effects of low production costs, improved economic benefits, and solutions to environmental problems

CN108250243AInactive Publication Date: 2018-07-06红河砷业有限责任公司
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for comprehensive utilization of arsenic-containing waste hydrochloric acid, the method steps are as follows:

[0015] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 17g / L of arsenic content, organic matter content of 1 / 86v / v, and mass concentration of 28% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;

[0016] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.

[0017] The actual yield of benzyl arsenic acid was 96.2%, and 1018L of waste hydrochloric acid containing arsenic was consumed.

Embodiment 2

[0019] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 14g / L of arsenic content, organic matter content 1 / 93v / v, and mass concentration of 31% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;

[0020] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.

[0021] The actual yield of benzyl arsenic acid was 97.3%, and 986L of waste hydrochloric acid containing arsenic was consumed.

Embodiment 3

[0023] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 15g / L of arsenic content, organic content 1 / 81v / v, and mass concentration of 20% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;

[0024] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.

[0025] The actual yield of benzyl arsenic acid was 95.3%, and 1327L of waste hydrochloric acid containing arsenic was consumed.

[0026] The alkali-containing sodium benzyl arsenate mother liquor described in the foregoing embodiments of the present invention is obtained by reacting ar...

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Abstract

The invention relates to a comprehensive utilization method of arsenious waste hydrochloric acid. The method comprises the following steps of slowly adding the arsenious waste hydrochloric acid into an alkaline benzyl arsonic acid sodium mother solution to perform acid-base neutralization reaction to precipitate benzyl arsonic acid; enabling the precipitated benzyl arsonic acid to be subjected todehydration to obtain a benzyl arsonic acid product; preparing a sub-arsonic acid sodium solution by reusing a dehydrated arsenious waste solution through crystal desalination. The alkaline benzyl arsonic acid sodium mother solution is prepared through the following steps of enabling arsenic trioxide to react with an excessive sodium hydroxide solution to obtain sodium arsenite and then reacting with benzyl chloride to obtain the benzyl arsonic acid sodium mother solution. The invention creatively provides comprehensive utilization of the arsenious waste hydrochloric acid to produce the benzylarsonic acid, the arsenious waste hydrochloric acid is effectively treated, turning waste into wealth is achieved, comprehensive recycle is realized, not only can the environmental protection problembe solved, but also the economic benefit can be improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization methods of arsenic-containing waste hydrochloric acid. Background technique [0002] Hydrochloric acid is a dangerous chemical, and the country has strict regulations on its use or disposal. Arsenic-containing waste hydrochloric acid is a by-product produced in the production process of OBPA (organic compounds containing arsenic), which is produced in a large amount and will cause serious pollution and damage to the surrounding atmospheric environment, soil environment, water environment, buildings and organisms, so it cannot Direct discharge or disposal. The existing method for treating arsenic-containing waste hydrochloric acid is to add alkali to adjust the pH value to 8-9, and then add calcium salt / iron salt to precipitate arsenic. The disadvantage is that the alkali consumption is large, the cost is high, and a large amount of arsenic is produced. Waste residues cause seco...

Claims

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Application Information

Patent Timeline
06 Jul 2018
Publication
CN108250243A
IPC
C07F9/74
Inventors
张洪; 何政兵