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A kind of sewage treatment method of producing propylene oxide by oxidation of cumene

A sewage treatment method and propylene oxide technology, which are applied in the directions of oxidized water/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of unfavorable treatment sewage recycling, high treatment cost, low cost, etc. , to achieve the effect of reducing follow-up treatment costs, small footprint and high efficiency

Active Publication Date: 2019-01-25
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a sewage treatment method for the oxidation of cumene to propylene oxide. The sewage of the oxidation of cumene to propylene oxide includes three types of sewage, which are sewage with high sodium phenate content , sewage with high sodium carbonate content and sewage with high cumene content, to solve the problems of high treatment cost and low efficiency in the mixed treatment of the three kinds of sewage in the prior art, and the problems that are not conducive to the recycling and utilization of sewage treatment. Different types of sewage are treated separately, which has the advantages of high efficiency and low cost

Method used

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  • A kind of sewage treatment method of producing propylene oxide by oxidation of cumene
  • A kind of sewage treatment method of producing propylene oxide by oxidation of cumene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The sewage treatment method that the oxidation of cumene to propylene oxide provided by the present embodiment specifically comprises the following steps:

[0056] (1), mixing the sewage with high sodium phenate content with sulfuric acid, adjusting the pH value of the sewage with high sodium phenate content to 2.5, carrying out acidification reaction at 30°C, and separating the acidified crude phenol from sewage;

[0057] (2), adding extractant to the separated sewage in step (1) and carrying out 3-stage separation of countercurrent extraction, remove phenol, obtain rich phenol extractant and dephenolized sewage, combine rich phenol extractant with high sodium carbonate content sewage Mix and carry out back extraction and separate in two stages to obtain sodium phenate and extractant, then recover the extract and continue to use it in the countercurrent extraction process;

[0058] (3), the dephenolized sewage described in step (2) is mixed with the high cumene content...

Embodiment 2

[0063] The sewage treatment method that the oxidation of cumene to propylene oxide provided by the present embodiment specifically comprises the following steps:

[0064] (1), mixing the sewage with high sodium phenate content with sulfuric acid, adjusting the pH value of the sewage with high sodium phenate content to 2, carrying out acidification reaction at 40°C, and separating the acidified crude phenol from sewage;

[0065] (2), adding dephenol extractant N-503 to the sewage separated in step (1) and carrying out countercurrent extraction 2-stage separation, remove phenol, obtain rich phenol extractant and dephenol sewage, combine rich phenol extractant with Sewage with high sodium carbonate content is mixed for back extraction and three-stage separation to obtain sodium phenate and extractant, and then the extract is recovered and continued to be used in the countercurrent extraction process;

[0066] (3), mix the dephenolized sewage described in step (2) with the high cu...

Embodiment 3

[0071] The sewage treatment method that the oxidation of cumene to propylene oxide provided by the present embodiment specifically comprises the following steps:

[0072] (1), the high sodium phenate content sewage is mixed with sulfuric acid, the pH value of the high sodium phenate content sewage is adjusted to 2.5 to carry out the acidification reaction, and the crude phenol after the acidification is separated from the sewage;

[0073] (2), adding extractant to the separated sewage in step (1) and carrying out 3-stage separation of countercurrent extraction, remove phenol, obtain rich phenol extractant and dephenolized sewage, combine rich phenol extractant with high sodium carbonate content sewage Mix and carry out back extraction and separate in two stages to obtain sodium phenate and extractant, and then recover the extract to continue to use;

[0074] (3) Mix the dephenolized sewage described in step (2) with the high-cumene-content sewage, and use an ultraviolet advanc...

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Abstract

The invention provides a sewage treatment method by using propylene oxide from isopropylbenzene oxidization. Different types of sewage are treated respectively, the treatment steps include 'acidification, extracting, ultraviolet high-grade oxidization, aerobic biochemical treatment, settling, ozone aeration, biofilter treatment and the like, sewage is treated in separate flows, treating efficiency of each unit device and economic benefit of the whole process are improved, the treated sewage may be discharged within limits, and the method has the advantages of high efficiency, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method for oxidizing cumene to produce propylene oxide. Background technique [0002] In the production process of cumene oxidation (abbreviated as CHP method) to propylene oxide, about 0.9t of sewage will be produced for every 1t of propylene oxide produced. The composition of the sewage is complex, containing refractory organics such as cumene and dimethyl benzyl alcohol, and organic and inorganic salts such as sodium phenate, sodium acetate and sodium carbonate. The average COD is as high as 35000mg / L, and the average TDS is as high as 20000mg / L. The characteristics of high COD, high salt content, and difficult biochemical degradation far exceed the takeover standards of comprehensive sewage treatment plants, and pretreatment is necessary. At the same time, the high organic content and high salt content are also difficult to remove by ordinary meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/001C02F1/26C02F1/32C02F1/722C02F1/78C02F3/02C02F9/00C02F2001/007C02F2103/36C02F2301/08C02F2305/026
Inventor 曹玉红何庆生何小娟张建成王贵宾范景福田小峰
Owner SINOPEC ENG GRP CO LTD