Method for controlling and recycling waste water containing acetic acid and chromium

A resource recovery and chromium wastewater technology, applied in the chemical field, can solve the problems of high water content in wastewater, serious environmental pollution, strong corrosiveness of acetic acid, etc., and achieve the effect of increasing the concentration of recovered acetic acid, improving economic benefits, and reducing raw material costs

Inactive Publication Date: 2011-01-26
湘西自治州奥瑞克医药化工有限责任公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the high water content of the wastewater, the recovery of acetic acid by direct concentration can only reach about 30%, which has no practical application value, and acetic acid has strong corrosiveness. If it is discharged, the environmental pollution will be serious.
At the same time, the residue after the concentration of the wastewater contains a large amount of chromium ions, and due to the toxicity of chromium, it has a great impact on the environment.
In addition, the residual sodium acetate in the waste water cannot be comprehensively utilized

Method used

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  • Method for controlling and recycling waste water containing acetic acid and chromium

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A method for the treatment and resource recovery of chromium-containing wastewater containing acetic acid

[0021] Take 500ml of chromium-containing waste water containing acetic acid produced in industrial production, add 250ml of ethyl acetate under stirring, stir and extract at 35°C for 30 minutes, let stand for 30 minutes, separate the ethyl acetate phase, continue to extract the water phase with ethyl acetate, and so on. Extract three times, the color of ethyl acetate separated out for the third time is almost colorless, combine the ethyl acetate phase, backwash with a small amount of water, merge the water phase into the above water phase, and slowly add saturated aqueous sodium carbonate solution dropwise under stirring to adjust the pH value After reaching 7-8, let stand for 30 minutes, filter with suction, and dry to obtain 100g of chromium carbonate. The filtrate was concentrated and crystallized to obtain 200 g of sodium acetate after drying. T...

Embodiment 2

[0022] Embodiment 2: A method for the treatment and resource recovery of chromium-containing wastewater containing acetic acid

[0023] 1000L of chromium-containing waste water containing acetic acid produced in industrial production is vacuum-pumped into the stirring extraction tank, 350L of ethyl acetate is added under stirring, steam heating is used to control the extraction temperature at 30°C, stirring and extraction for 30 minutes, standing for 30 minutes, and the ethyl acetate phase is separated. The aqueous phase continued to be extracted with ethyl acetate, and the extraction was repeated three times in total, and the color of ethyl acetate separated out for the third time was almost colorless, and the ethyl acetate phase was combined and injected into the concentration tank. The water phase is injected into the reaction tank, and under stirring, slowly add saturated aqueous sodium carbonate solution dropwise from the sodium carbonate configuration tank, adjust the pH ...

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Abstract

The invention relates to a method for controlling and recycling waste water containing acetic acid and chromium, belonging to the chemical field. The method solves the pollution of acid-chromium waste water produced in the production process of diene, simultaneously recycles sodium acetate and glacial acetic acid, is used for circular production, obtains chromium salt capable of being applied in the market and does not generate new waste water pollution.

Description

technical field [0001] The invention relates to a treatment and resource recovery method for chromium-containing wastewater containing acetic acid, and belongs to the field of chemistry. Background technique [0002] In recent years, chromium and its compounds have been widely used in industrial production, resulting in a large amount of chromium-containing wastewater. There are two main forms of chromium in chromium-containing wastewater: hexavalent chromium and trivalent chromium, of which hexavalent chromium is the most toxic. Chromium-containing wastewater is dissolved and infiltrated with rainwater after discharge, seriously polluting the surrounding soil, rivers and groundwater sources, causing serious pollution. [0003] The chromium-containing waste water containing acetic acid described in the method comes from the acidic aqueous phase separated by cyclohexane extraction after ring opening, oxidation and hydrolysis in the production of diene, and its main component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C53/10C07C53/08C07C51/48C07C51/41C02F1/26
Inventor 张蕾陈刚
Owner 湘西自治州奥瑞克医药化工有限责任公司
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