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Title:
SUPERHYDROPHOBIC MEMBRANE AND PREPARATION METHOD THEREFOR, AND METHOD FOR CONCENTRATING AND RECYCLING MDI WASTE BRINE
Document Type and Number:
WIPO Patent Application WO/2021/097819
Kind Code:
A1
Abstract:
A superhydrophobic membrane and a preparation method therefor, and a method for concentrating and recycling MDI waste brine. The method for concentrating and recycling MDI waste brine comprises: 1) performing two-phase separation on MDI waste brine to produce an organic phase and a brine phase; 2) sequentially subjecting the brine phase to aniline extraction, reboil distillation, and TOC removal processes; and 3) washing the organic phase to obtain washing wastewater; enabling the washing wastewater to contact an extractant by means of the superhydrophobic membrane for membrane extraction; and transporting the washing wastewater having experienced the membrane extraction to a biochemical unit and then enabling same to enter a reclaimed water recycling system.

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Inventors:
LI YONGFENG (CN)
XING JINMING (CN)
WU XUEFENG (CN)
ZHANG HONGKE (CN)
FAN ZHENLONG (CN)
GAO XUESHUN (CN)
ZENG FANXUE (CN)
CUI CHENGCHENG (CN)
ZHOU BO (CN)
ZHAO YIBING (CN)
LI PENG (CN)
YANG QILIN (CN)
Application Number:
PCT/CN2019/120339
Publication Date:
May 27, 2021
Filing Date:
November 22, 2019
Export Citation:
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Assignee:
WANHUA CHEMICAL GROUP CO LTD (CN)
WANHUA CHEMICAL NINGBO CO LTD (CN)
International Classes:
B01D67/00; C02F1/26; C07C209/86
Foreign References:
CN110090557A2019-08-06
CN110090557A2019-08-06
CN110075721A2019-08-02
CN101481081A2009-07-15
CN101537682A2009-09-23
CN101801909A2010-08-11
CN102046588A2011-05-04
KR20160131654A2016-11-16
GB1517585A1978-07-12
SU785206A11980-12-07
CN200880107822A2008-08-28
CN200980118981A2009-05-20
CN201610719105A2016-08-25
Attorney, Agent or Firm:
SINO-CREATIVITY INTELLECTUAL PROPERTY LAW FIRM (CN)
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