Title:
PROCESS FOR PRODUCING HIGH-PURITY AQUEOUS UREA SOLUTION IN UREA PRODUCTION PROCESS
Document Type and Number:
WIPO Patent Application WO/2016/047356
Kind Code:
A1
Abstract:
The present invention relates to a process for producing a high-purity aqueous urea solution while utilizing a urea production process at least including a urea synthesis step in which urea is synthesized from feed materials to produce a urea synthesis liquid and a urea purification step in which the urea synthesis liquid is purified to produce an aqueous urea solution having a high urea concentration. This process comprises: a urea crystallization step in which some of the urea synthesis liquid and/or some of the aqueous urea solution is separated and the urea contained in the separated urea synthesis liquid and/or aqueous urea solution is crystallized to produce crystalline urea, which is solid; and a mixing step in which the crystalline urea is mixed with water to produce a high-purity aqueous urea solution. The produced high-purity aqueous urea solution is suitable for use as a reducing agent for SCR.
Inventors:
MORIKAWA HARUYUKI (JP)
NAKAMURA SHUHEI (JP)
SATO KEISHI (JP)
NAKAMURA SHUHEI (JP)
SATO KEISHI (JP)
Application Number:
PCT/JP2015/074200
Publication Date:
March 31, 2016
Filing Date:
August 27, 2015
Export Citation:
Assignee:
TOYO ENGINEERING CORP (JP)
International Classes:
C07C273/16; C07C275/00
Foreign References:
| JP2008239574A | 2008-10-09 | |||
| JP2008538133A | 2008-10-09 | |||
| JP2008280263A | 2008-11-20 |
Other References:
See also references of EP 3199518A4
Attorney, Agent or Firm:
TANAKA AND OKAZAKI (JP)
Patent business corporation Tanaka and Okazaki and associates (JP)
Patent business corporation Tanaka and Okazaki and associates (JP)
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