Title:
METHOD FOR PRODUCING HIGH-PURITY UREA AQUEOUS SOLUTION IN UREA PRODUCTION PROCESS
Document Type and Number:
Japanese Patent JP2016064991
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing high-purity urea aqueous solution preferable for reducer for SCR by using urea aqueous solution produced in an urea synthesis process in a urea production plant.SOLUTION: There is provided a method for producing high-purity urea aqueous solution in a urea production process having at least: a urea synthesis process in which urea is synthesized from a raw material feed to produce urea synthesis liquid; and a urea refining process in which the urea synthesis liquid is refined to produce urea aqueous solution having high urea concentration, and the method comprises: a urea crystallization process in which a part of the urea synthesis liquid and/or a part of the urea aqueous solution are separated, urea in the separated urea synthesis liquid and/or urea aqueous solution is crystallized to produce crystal urea being a solid body; and a mixing process in which the crystal urea and water are mixed to produce high-purity urea aqueous solution.SELECTED DRAWING: Figure 1
Inventors:
MORIKAWA HARUYUKI
NAKAMURA SHUHEI
SATO HIROSHI
NAKAMURA SHUHEI
SATO HIROSHI
Application Number:
JP2014192989A
Publication Date:
April 28, 2016
Filing Date:
September 22, 2014
Export Citation:
Assignee:
TOYO ENGINEERING CORP
International Classes:
C07C273/16; C07C273/04; C07C275/00
Attorney, Agent or Firm:
Patent business corporation Tanaka, Okazaki and Associates