Title:
METHOD FOR TREATING PRODUCTION WASTEWATER FROM PREPARATION OF PROPYLENE OXIDE WITH CO-OXIDATION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/120133
Kind Code:
A1
Abstract:
Provided is a method for treating production wastewater from the preparation of propylene oxide with a co-oxidation method, wherein the production wastewater includes a first portion of wastewater with a peroxide content of 2000 mg/L or more and a second portion of wastewater with a peroxide content of less than 50 mg/L. The treatment method comprises: (1) performing catalytic oxidation on the first portion of wastewater to obtain discharged wastewater; (2) mixing the discharged wastewater with the second portion of wastewater, then rectifying same via a first rectification tower to obtain a first overhead material and primary concentrated wastewater as a first tower bottom liquid; rectifying the first tower bottom liquid via a second rectification tower to obtain a second overhead material and secondary concentrated wastewater as a second tower bottom liquid; and subjecting the first overhead material and the second overhead material to oil-water separation via a third rectification tower; (3) subjecting the second tower bottom liquid to an incineration treatment; and (4) subjecting the third tower bottom liquid to a biochemical treatment. The treatment method is applicable to wastewater with a high content of salt and organic substances and a high peroxide content, and can remove peroxides therefrom, improve the biodegradability of the wastewater, and reduce the difficulty and cost of the treatment of the wastewater.
Inventors:
FAN ZHENLONG (CN)
DONG YANFENG (CN)
ZENG FANXUE (CN)
YE JIANCHU (CN)
LENG BINGWEN (CN)
YU GENHAI (CN)
HE XINCHUN (CN)
ZHANG HONGKE (CN)
DONG YANFENG (CN)
ZENG FANXUE (CN)
YE JIANCHU (CN)
LENG BINGWEN (CN)
YU GENHAI (CN)
HE XINCHUN (CN)
ZHANG HONGKE (CN)
Application Number:
PCT/CN2019/126780
Publication Date:
June 24, 2021
Filing Date:
December 19, 2019
Export Citation:
Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
International Classes:
C02F9/10; C02F1/04; C07C29/80
Foreign References:
| CN102093316A | 2011-06-15 | |||
| CN104230684A | 2014-12-24 | |||
| US3881996A | 1975-05-06 |
Other References:
"Technical Progress and Market Analysis of Propylene Oxide Production", SHANGHAI RESEARCH INSTITUTE OF PETROCHEMICAL TECHNOLOGY OF CHINA PETROLEUM AND CHEMICAL CORPORATION
See also references of EP 3865461A4
See also references of EP 3865461A4
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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