公开(公告)号：DE2831941A1

公开(公告)日：1980-02-07

申请号：DE2831941

申请日：1978-07-20

Applicant: BASF AG

Inventor： BLANCK KLAUS DIPL CHEM DR ,  LEUTNER BERND DIPL CHEM DR ,  BACK WOLF-DIETER DIPL ING DR

IPC: C01B17/94

Abstract: The elimination of nitrous acid and/or nitric acid from waste sulphuric acid, partic. that arising from nitration processes, involves treatment of the waste sulphuric acid with monomeric or polymeric cpds. of carbonic, formic, acetic and/or sulphuric acids contg. NH2 gps. (i.e. acid amides), and/or hydroxylamine, and/or treatment with ammonium salts. Treatment is pref. at 30-150 degrees C and 0.5-60 mn. Partic. the cpd. used to treat the waste sulphuric acid is urea or one of its condensn. prods. The cpd. can be added in an excess up to 10% above the stoichiometric amt. required.