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Class Information
Number: 423/523
Name: Chemistry of inorganic compounds > Sulfur or compound thereof > Oxygen containing > Ternary compound containing hydrogen > Sulfuric acid > Nitrogenous impurity or utilizing nitrogenous catalyst or reactant
Description: Processes in which during the manufacture of the sulfuric acid a compound of nitrogen is used as a catalyst or as a reactant, or is present as an impurity which requires removal.

Sub-classes under this class:

Class Number Class Name Patents
423/524 Lead chamber process 5

Patents under this class:

Patent Number Title Of Patent Date Issued
8597603 Decomposition/elimination method using a photocatalytic material Dec. 3, 2013
8444942 Process for removing contaminants from gas streams May. 21, 2013
8398951 Polypyrrole and silver vanadium oxide composite Mar. 19, 2013
8173090 Sorbent use with oxyfuel sour compression May. 8, 2012
7988942 Method and system for concentrating waste sulphuric acids from nitration processes Aug. 2, 2011
7964166 Process for removing contaminants from gas streams Jun. 21, 2011
7927573 Multi-stage process for purifying carbon dioxide and producing acid Apr. 19, 2011
7927572 Purifying carbon dioxide and producing acid Apr. 19, 2011
7632475 Process for removing contaminants from gas streams Dec. 15, 2009
7416716 Purification of carbon dioxide Aug. 26, 2008
7252813 Process for condensation of sulphuric acid vapours to produce sulphuric acid Aug. 7, 2007
6893622 Process for the combustion of sulphur for the preparation of oleum and sulphuric acid with reduced (NO)x content May. 17, 2005
6740302 Method for producing high-purity sulphuric acid May. 25, 2004
6627172 Process for preparing sulphuric acid from gases containing SO3 and gaseous nitrosylsulphuric acid Sep. 30, 2003
6342651 Reductive combustion of ammonium salts of sulfuric acid Jan. 29, 2002
6156288 Process for purifying and concentrating spent sulfuric acids Dec. 5, 2000
6146612 Method for recovering sulfuric acid from sulfate salts Nov. 14, 2000
5955050 No.sub.x destruction in sulphuric acid Sep. 21, 1999
5788949 Liquid phase conversion of a source of sulfur dioxide to sulfuric acid Aug. 4, 1998
5670127 Process for the manufacture of nitric oxide Sep. 23, 1997
5494869 Process for regenerating nitrogen-treated carbonaceous chars used for hydrogen sulfide removal Feb. 27, 1996
5456891 Process for the purification of contaminated exhaust gases from incineration plants Oct. 10, 1995
5389354 Process for the production of oleum and sulfuric acid Feb. 14, 1995
5308600 Process for conditioning waste sulfuric acid May. 3, 1994
5145521 Sulfuric acid/polyamide compositions Sep. 8, 1992
5030436 Spent acid purification process Jul. 9, 1991
5026535 Method for decoloring sulphuric acid deriving from acid production processes Jun. 25, 1991
4590047 Method for desulfurizing combustion gases May. 20, 1986
4557912 Air pollution reduction Dec. 10, 1985
4426364 Removal and recovery of nitrogen oxides and sulfur dioxide from gaseous mixtures containing them Jan. 17, 1984
4400362 Removal of nitrogen oxides from gas Aug. 23, 1983
4384924 Method of separating acids and bases which have been carried along in the vapors formed during distillation May. 24, 1983
4358427 Removal of hydrogen sulfide from geothermal steam Nov. 9, 1982
4285924 Separation of acids Aug. 25, 1981
4257986 Process for refining aqueous acid mixtures utilized in nitration of aromatics Mar. 24, 1981
4242321 Process for separating SO.sub.2 from a current of gas containing the same, and plant for carrying out such process Dec. 30, 1980
4155989 Removal of nitric acid from nitric acid-sulfuric acid mixtures May. 22, 1979
4150103 Foam prevention during the regeneration of waste sulfuric acid with aromatic nitro compounds Apr. 17, 1979
4148868 Process for separating SO.sub.2 from a current of gas containing the same Apr. 10, 1979
4044111 Method of treating calcium nitrate contained in denitration waste liquid Aug. 23, 1977
4014982 Combined process for upgrading spent alkylation acid and reducing noxious gas content of waste gaseous streams Mar. 29, 1977
4010240 Process for the regeneration of sulfuric acid Mar. 1, 1977
3993730 Purification of coke oven gas with production of sulfuric acid and ammonium sulfate Nov. 23, 1976
3981975 Preparation of anhydrous nitric acid Sep. 21, 1976
3977830 Silver nitrite reactant for measuring SO.sub.2 Aug. 31, 1976
3972987 Process for regenerating sulfuric acid Aug. 3, 1976

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