The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2015
Filed:
Aug. 18, 2009
Applicant:
Sergio Berretta, Vancouver, CA;
Inventor:
Sergio Berretta, Vancouver, CA;
Assignee:
NORAM INTERNATIONAL LIMITED, , IE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 27/26 (2006.01); C07C 201/16 (2006.01); C02F 1/04 (2006.01); C02F 1/20 (2006.01); C02F 101/38 (2006.01);
U.S. Cl.
CPC ...
C07C 201/16 (2013.01); C02F 1/04 (2013.01); C02F 1/20 (2013.01); C02F 2101/38 (2013.01); C02F 2209/06 (2013.01);
Abstract
A method of removing alkalinity and salt from a nitroaromatic product downstream of water washing to remove mineral acids and alkaline washing to remove salts of organic acids, comprises washing the product stream with an acidic aqueous solution, prior to the step of removing excess organic reactant, by steam stripping or distillation. Acid removed from the stripper or column is recycled back for use in the acidic washing. The acidic washing is done instead of the neutral washing step of the prior art. It removes residual salt and decreases the level of entrained colloidal water in the nitroaromatic product.