Method for treating octanol waste lye by miscellaneous alcohol acidization-extraction method

A technology of waste lye and extraction method, which is applied in chemical instruments and methods, extraction water/sewage treatment, water/sewage treatment, etc., and can solve problems such as high investment and operating costs, large separation equipment, and unfeasible processes , to achieve significant governance effects, low operating costs, and simple operation
CN101353213AActive Publication Date: 2009-01-28PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2009-01-28

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Abstract

The invention relates to a method for treating waste lye discharged by the reaction system when octanol is produced. The recycled lye part discharged by an octanol production device is sent to an acidification mixer, inorganic acid and fusel are added for acidification mixture, demixing fluid is clear and separated by quiescence; extraction phase returns to a fusel tank for recycling, wastewater after neutralization is discharged to sewage farms for carrying out biological treatment; the mixing time is 3-15 minutes, the proportion by volume between the extraction agent and the wastewater is 1:1-8, the pH value after acidification is 2.0-4.5, the proportion by volume between the wastewater and 93% of concentrated sulphuric acid is 40-80:1, normal temperature and normal pressure are kept, the separated time is 30-120 minutes, the pH value of the treated water by neutralization is 6-9, the deoiling ratio is over 82%, the ratio of CODcr removal reaches 50%, biodegradability of the wastewater after treatment is improved from 40% to over 90%, the wastewater after treatment can directly enter chemical sewage farms for carrying out biological treatment, and the extraction agent does not need be regenerated.
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Description

Technical field:

[0001] The invention relates to a treatment method for waste lye discharged from a reaction system during octanol production. In particular, it relates to a treatment method for the waste lye discharged from the system when the aldehyde condensation reaction generates octenal. Background technique

[0002] In the octanol production cycle of the butanol plant, high-purity n-butyraldehyde is condensed under the condition of 2% NaOH as a catalyst to generate octenal, and at the same time, it also generates water equivalent to octenal. Water has diluted the catalyst. In order to maintain the balance of the catalyst system, a certain amount of dilute lye must be continuously discharged from the system. At the same time, a part of high-concentration lye must be added to keep the condensation reaction going on normally. In addition to the spent alkali with a concentration of 1.5-2.0% (weight), the liquid has a high content of organic matter, COD cr The concentrat...

Claims

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