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Method for zero discharge processing of waste saponification lye of cyclohexanone produced by cyclohexane oxidation technology

An oxidation process and cyclohexane technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Emissions and other issues, to achieve significant environmental benefits, less energy consumption, simple process effect

Inactive Publication Date: 2009-05-13
赵志军
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Problems solved by technology

The waste gas and waste water produced by the acid neutralization treatment method will cause serious secondary pollution; the incineration treatment method has large investment and high operating costs, wastes fuel energy and generates a large amount of carbon dioxide emissions to the air
Thereby saponification waste lye cannot be effectively treated and will directly affect the enlarged production of cyclohexanone

Method used

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  • Method for zero discharge processing of waste saponification lye of cyclohexanone produced by cyclohexane oxidation technology

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Embodiment Construction

[0021] The basic material components and weight percentages of the saponification waste lye (hereinafter referred to as waste liquid) that the inventive method radically handles are:

[0022] Inorganic matter: sodium carbonate (Na 2 CO 3 ) about 7%

[0023] Sodium hydroxide (NaOH) about 8%

[0024] Organic matter: organic acids, alcohols, ketones, about 35%

[0025] The rest: about 50% water

[0026] Below in conjunction with technological process block diagram, briefly describe the implementation process of the inventive method:

[0027] (1) Feed a sufficient amount of carbon dioxide gas or clean flue gas into the waste liquid at normal temperature to extract sodium bicarbonate; the feed amount of carbon dioxide needs to meet the balance requirements of the following chemical reaction equation:

[0028] CO 2 +NaOH=NaHCO 3

[0029] CO 2 +Na 2 CO 3 +H 2 O=2NaHCO 3

[0030] This process is based on: Since the waste liquid contains about 15% of alkali substa...

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Abstract

The invention provides a method for zero discharge treatment of waste saponified lye generated during producing cyclohexanone by a cyclohexane oxidation technology. The method comprises the following technological steps: (1) the waste saponified lye is filtered, and simultaneously sufficient carbon dioxide gas is introduced into the waste saponified lye; (2) sodium carbonate is extracted after evaporation and separation; (3) acid oil is extracted after acid neutralization; and (4) sodium sulfate is extracted after separation and concentration. Moreover, the method also comprises the following technological steps: extraction of purified products, namely sodium carbonate, extraction of purified products, namely sodium sulfate, treatment of waste gas generated by acid neutralization, and treatment of condensed water. The method completely eliminates pollution of the waste saponified lye to the environment, has small investment of the adopted equipment and small energy consumption, can 'treat waste with processes of waste against one another', reclaims inorganic and organic chemical products from the waste saponified lye, and fully utilizes water resources of wastewater. Moreover, the method has simple technology, is suitable for industrial treatment of the waste saponified lye, has no secondary pollution emission during the treatment, really achieves zero discharge, and has obvious environmental benefit, social benefit and economic benefit.

Description

technical field [0001] The invention relates to chemical wastewater treatment technology, in particular to a zero-discharge method for saponification waste lye produced by cyclohexane oxidation process to produce cyclohexanone. Background technique [0002] Cyclohexanone is a raw material for synthetic resins and synthetic fibers. Industrial production of cyclohexanone generally adopts cyclohexane oxidation process. During the implementation of this process, a large amount of saponification waste lye will be produced. A certain amount of inorganic and organic matter remains in these saponification waste lye, the liquid has deep color, strong smell, and the COD value seriously exceeds the standard. For such highly polluted chemical wastewater, it is usually treated by acid neutralization or incineration. The waste gas and waste water produced by the acid neutralization treatment method will cause serious secondary pollution; the incineration treatment method requires a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D7/00C01D5/00
Inventor 赵志军
Owner 赵志军
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