Title:
HIGH-PURITY UREA WATER AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2014037357
Kind Code:
A
Abstract:
To provide a novel high-purity urea water and method for producing the same, in which the methylene urea that is suspected to be a clogging causative substance of the pipe which introduces urea water into SCR catalyst in the adoption of urea SCR process, is reduced.
Such a high-purity urea water is obtained from a granular urea to which formaldehyde is added as an anti-solidification agent and the methylene urea concentration is 10 ppm or less in terms of aldehyde conversion value measured by chromotropic acid absorption spectrometry.
Inventors:
KUWAKI TAKUYA
Application Number:
JP2012179200A
Publication Date:
February 27, 2014
Filing Date:
August 13, 2012
Export Citation:
Assignee:
NIPPON KASEI CHEM
International Classes:
C07C275/02; C07C273/16
Domestic Patent References:
| JP2008538133A | 2008-10-09 | |||
| JPS5034536B1 | 1975-11-10 | |||
| JPH11335345A | 1999-12-07 | |||
| JP2004290835A | 2004-10-21 | |||
| JPS49135924A | 1974-12-27 |
Attorney, Agent or Firm:
Kazuhiko Okada
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