Title:
METHOD FOR TREATING DISCHARGED SALINE WATER GENERATED DURING PREPARATION OF MDA
Document Type and Number:
WIPO Patent Application WO/2022/067746
Kind Code:
A1
Abstract:
The present invention provides a method for treating discharged saline water generated during the preparation of MDA. Before catalytic oxidation treatment, the content of phenol is controlled to be not more than 0.8 mg/L and/or the content of sodium bromide is controlled to be not more than 0.2 mg/L. According to the treatment method provided by the present invention, the impurity components of discharged saline water are deeply analyzed, the content of phenol and the content of sodium bromide in the discharged saline water are effectively controlled to achieve the effect of deep purification; the content of TOC and the content of bromophenol in the treated discharged saline water are relatively low, and organic matters are thoroughly removed, reducing environmental pressure; and the treatment method provided by the present invention is highly pertinent, simple in process, convenient to implement industrially and stable in operation, does not require a lot of manpower and device investment, and has a very promising application prospect.
Inventors:
XING JINMING (CN)
LI YONGFENG (CN)
CHEN LIANGJIN (CN)
ZHANG LIANG (CN)
WU XUEFENG (CN)
ZHANG HONGKE (CN)
LI YONGFENG (CN)
CHEN LIANGJIN (CN)
ZHANG LIANG (CN)
WU XUEFENG (CN)
ZHANG HONGKE (CN)
Application Number:
PCT/CN2020/119620
Publication Date:
April 07, 2022
Filing Date:
September 30, 2020
Export Citation:
Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
C02F9/10; C02F103/36
Domestic Patent References:
| WO2019121199A1 | 2019-06-27 |
Foreign References:
| CN101665302A | 2010-03-10 | |||
| CN110743623A | 2020-02-04 | |||
| CN102139976A | 2011-08-03 |
Other References:
ZHANG, HONGKE : "A Study on Removing Organic Amine Substances by Active Carbon Absorption from Salt Water Produced in MDI Condensation Process", PROCEEDINGS OF CHINA POLYURETHANE INDUSTRY ASSOCIATION 13TH ANNUAL SYMPOSIUM, 30 June 2006 (2006-06-30), CN, pages 402 - 409, XP009535913
Attorney, Agent or Firm:
SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)
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