Method for treating waste saline water produced in production process of diphenylmethane diisocyanate (MDI)

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United States of America Patent

PATENT NO 9802848
APP PUB NO 20120168375A1
SERIAL NO

13496872

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Abstract

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The invention relates to a method of circular use of waste brine produced in the manufacture process of MDI, comprising the following steps: (1) the waste brine produced in the manufacture process of MDI is subjected to a high-gravity extraction and then to a column extraction, wherein said waste brine contains aniline, diaminodiphenylmethane and polyamine; (2) the waste brine from step (1) is transmitted to a stripping tower for steam stripping; (3) the waste brine from the stripping tower of step (2) and a chemical oxidant are transmitted to an oxidation reactor to which air is blown for aeration; (4) the waste brine after the treatment of step (3) is transmitted to an absorption tower for absorption. The invention makes the salt water have TOC of less than 8 ppm and TN of less than 2.5 ppm and achieves regeneration of resources in the waste brine such as sodium chloride and water and the like for circular use.

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Patent Owner(s)

Patent OwnerAddress
WANHUA CHEMICAL (NINGBO) CO LTD315812 WANHUA INDUSTRIAL PARK 39 HUANDAO NORTH ROAD DAXIE DEVELOPMENT ZONE NINGBO CITY ZHEJIANG PROVINCE NINGBO CITY ZHEJIANG PROVINCE 315812

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Jianfeng Beijing, CN 121 682
Chu, Guangwen Beijing, CN 15 64
Ding, Jiansheng Zhejiang, CN 16 32
Hua, Weiqi Zhejiang, CN 39 31
Liu, Xiaogao Zhejiang, CN 30 165
Sun, Shuchang Zhejiang, CN 4 2
Xu, Limin Beijing, CN 15 21
Zhang, Hongke Zhejiang, CN 24 90
Zhang, Pengyuan Beijing, CN 12 340
Zhao, Zhenhua Zhejiang, CN 18 8
Zou, Haikui Beijing, CN 10 41

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