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Method for treating sewage produced during cyclohexanone production by adopting extraction method

A technology of cyclohexanone and extraction method is applied in the field of treating sewage generated in the production of cyclohexanone, which can solve the problems of insufficient effect and high operating cost, and achieve the effects of reducing treatment load, low operating cost and reducing organic matter concentration

Active Publication Date: 2013-04-03
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the air stripping method has the disadvantages of insufficient effect and high operating costs.

Method used

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  • Method for treating sewage produced during cyclohexanone production by adopting extraction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Pump sewage with a COD value of 16191mg / kg into the top of the second extraction tower 2, with a flow rate of 11.5m 3 / h. Control the flow rate of the extractant hexanaphthene that is pressed into the bottom of extraction tower 1 to be 5.0 m 3 / h. The measured COD values ​​of the sewage at the inlet and outlet of the second extraction tower 2 are 16191mg / kg and 3524mg / kg respectively, and the calculated COD extraction rate is 78.2%; The total extraction rate of COD was 94.5%.

Embodiment 2

[0013] Embodiment 2: Pump sewage with a COD value of 17257mg / kg into the top of the second extraction tower 2, with a flow rate of 11.5m 3 / h. Control the flow rate of the extraction agent cyclohexane that is pressed into the bottom of the extraction tower 1 to be 6.0 m 3 / h. The measured COD values ​​of the sewage at the inlet and outlet of the second extraction tower 2 are 17257mg / kg and 3169mg / kg respectively, and the calculated COD extraction rate is 81.6%; The total extraction rate of COD was 95.0%.

Embodiment 3

[0014] Example 3: Pump sewage with a COD value of 16358mg / kg into the top of the second extraction tower 2, with a flow rate of 11.5m 3 / h. Control the flow rate of the extractant hexanaphthene that is pressed into the bottom of extraction tower 1 to be 8.0 m 3 / h. The measured COD values ​​of the sewage at the inlet and outlet of the second extraction tower 2 are 16358mg / kg and 2640mg / kg respectively, and the calculated COD extraction rate is 83.9%; The total extraction rate of COD was 96.1%.

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Abstract

The invention discloses a method for treating sewage produced during cyclohexanone production by adopting an extraction method. In the method, low-concentration sewage produced in a cyclohexanone production process and cyclohexane serving as an extraction agent are reversely and continuously extracted in two extraction towers. The method has the advantages of small process investment, low runningcost and good sewage treating effect; and the extraction agent does not need to be treated after extraction, and can be directly taken as a raw material for production.

Description

technical field [0001] The invention relates to a method for treating sewage generated in the production of cyclohexanone. Background technique [0002] In the process of preparing cyclohexanone by cyclohexane air oxidation process, benzene and hydrogen are used as the main raw materials, hydrogenation of benzene, oxidation of cyclohexane, dehydrogenation of cyclohexanol, and finally distillation and purification to obtain the product cyclohexanone. Due to the process route, some low-concentration process sewage will be produced during the entire process. The COD value of these sewage is as high as tens of thousands due to the organic matter such as cyclohexanone, cyclohexanol, and cyclohexane. Discharge after treatment. The traditional method is to use air stripping to treat these sewage. However, the air stripping method has disadvantages such as insufficient effect and high operating costs. Contents of the invention [0003] The purpose of the present invention is to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26
Inventor 刘华锋黎树根高伟申武李勇军曹小方
Owner CHINA PETROCHEMICAL CORP