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Method for pretreating cyclohexanone ammoximation waste water

A cyclohexanone ammonia oxime and pretreatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of energy consumption, material consumption, and high investment in advanced oxidation technology equipment Problems, low cost, no secondary pollution, simple equipment and process

Active Publication Date: 2012-05-30
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Advanced oxidation technology has the disadvantages of high equipment investment, high energy consumption and material consumption in industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the laboratory device, take 1L of cyclohexanone ammoximation wastewater into a 2L three-necked flask, adjust the pH to 1.0 with 50% sulfuric acid, and raise the temperature to 98°C in a 2L electric heating mantle with magnetic stirring, under normal pressure Stir for 10 minutes, adjust the pH value to 7.0 with 20% sodium hydroxide after cooling, analyze the waste water after pretreatment, the peroxide content is 0mmol / L, the COD of waste water is reduced by 45%, and its biochemical index B / C value reaches 0.45.

Embodiment 2

[0022] As in Example 1, 10% hydrochloric acid is used to adjust the pH value of cyclohexanone ammoximation wastewater to 5.0, and the temperature is raised to 98° C., stirred for 60 minutes under normal pressure, and after cooling, the pH value is adjusted to 9.0 with 20% sodium hydroxide, and the peroxide When the content is 5mmol / L, the COD of wastewater is reduced by 41%, and the B / C value of its biochemical index reaches 0.4.

Embodiment 3

[0024] As in Example 1, 5% nitric acid is used to adjust the pH value of cyclohexanone ammoximation wastewater to 3.0, and the temperature is raised to 98° C., stirred for 30 min under normal pressure, and after cooling, the pH value is adjusted to 6.0 with 20% sodium hydroxide, and the peroxide When the content is 2mmol / L, the COD of waste water is reduced by 43%, and the B / C value of its biochemical index reaches 0.45.

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Abstract

The invention provides a method for pretreating cyclohexanone ammoximation waste water. The method comprises the following steps of: adjusting the pH value of waste water to be between 1 to 5 with acid; performing a self-reaction at the temperature of between 20 and 150 DEG C and under the pressure of between 0 and 1.0 MPa for 10 to 120 minutes; and adjusting the pH value to be between 6 and 9 with alkali or carbonate. After the cyclohexanone ammoximation waste water is treated by the method, the peroxide content is less than 10 mmol per L, the chemical oxygen demand (COD) of waste water is reduced by over 40 percent and the (biological / chemical) B / C indicator value is over 0.35.

Description

technical field [0001] The invention relates to a method for pretreatment of cyclohexanone ammoximation wastewater. Background technique [0002] The cyclohexanone ammoximation process is a process technology for producing cyclohexanone oxime. The reaction is divided into two steps. The first step is that ammonia is oxidized to hydroxylamine by hydrogen peroxide under the action of titanium silicon molecular sieve. The second step is the non-catalytic reaction between hydroxylamine and cyclohexanone to generate cyclohexanone oxime. In addition to the above-mentioned main reactions, side reactions such as the decomposition of hydrogen peroxide and the generation of heavy substances also occur. The catalyst and the reaction liquid are separated through the inorganic membrane filtration system, and the solvent and cyclohexanone oxime are recovered by rectification and extraction methods for the reaction liquid. The remaining waste water is discharged after being treated by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66
Inventor 吴明程立泉王春志瞿亚平旷志刚邓向阳谈长富曾红霞李惠友
Owner CHINA PETROLEUM & CHEM CORP