Title:
METHOD FOR RECYCLING UREA IN UREA ADDUCT PROCESS
Document Type and Number:
WIPO Patent Application WO/2016/058282
Kind Code:
A1
Abstract:
Disclosed is a method for recycling urea in the process of separating and purifying unsaturated substances through a urea adduction method. The method comprises the following steps: liposoluble substances containing target unsaturated components are used as raw materials, and subjected to urea adduction, crystallization and filtration to give a filtrate, from which the specific unsaturated components are obtained; the urea adduct is dissolved in a polar solvent, and after the adducted adducts are layered and released, adding a certain solvent to the urea solution to adjust the polarity, then cooling for crystallization, and recycling the urea. The method can realize complete release of the adducted components and recycling and reuse of urea, and the process is simple, the recovery rate is high, and the adduction effect is not influenced when recycling urea for reuse, and the production cost of the urea adduct is reduced, thus alleviating the adverse impact of urea discharges on the environment.
Inventors:
PENG YONGJIAN (CN)
XU XINDE (CN)
MA JINPING (CN)
ZHANG YANWEN (CN)
SHAO BIN (CN)
XU XINDE (CN)
MA JINPING (CN)
ZHANG YANWEN (CN)
SHAO BIN (CN)
Application Number:
PCT/CN2015/000685
Publication Date:
April 21, 2016
Filing Date:
October 12, 2015
Export Citation:
Assignee:
ZHEJIANG MED XINCHANG PHARM (CN)
International Classes:
C07C57/12; C07C27/02; C11C3/00
Foreign References:
| CN102746947A | 2012-10-24 | |||
| CN103333747A | 2013-10-02 |
Other References:
LV , WEI ET AL.: "Technology of recovering urea from urea inclusion compounds produced in the separation of fatty acids using urea complexation", CHEMICAL INDUSTRY AND ENGINEERING PROGRESS, vol. 31, no. 1, 31 January 2012 (2012-01-31), pages 202, XP008172909
See also references of EP 3208257A4
See also references of EP 3208257A4
Attorney, Agent or Firm:
FAITHFULAW INTERNATIONAL IP LAW OFFICE (CN)
北京乾诚五洲知识产权代理有限责任公司 (CN)
北京乾诚五洲知识产权代理有限责任公司 (CN)
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