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Browse by Category: Main > Chemistry
Class Information
Number: 423/531
Name: Chemistry of inorganic compounds > Sulfur or compound thereof > Oxygen containing > Ternary compound containing hydrogen > Sulfuric acid > Purifying acid or reactant
Description: Processes which include the removal or separation of impurities present in the reactants or in the acid.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8709376 Process for recovering and recycling an acid catalyst Apr. 29, 2014
8603420 Galvanic waste sludge treatment and manufacturing of nano-sized iron oxides Dec. 10, 2013
7842272 Process for the regeneration of sulfuric acid Nov. 30, 2010
7682066 Method for recycling waste sulfuric acid Mar. 23, 2010
7595035 Process for the recovery of sulfuric acid Sep. 29, 2009
7537749 Method for processing iron-laden spent sulfuric acid May. 26, 2009
7498007 Process to recover vanadium contained in acid solutions Mar. 3, 2009
7473409 Process for recycling waste acid Jan. 6, 2009
7452521 Method for the removal of mercury from sulphuric acid with thiosulphate precipitation Nov. 18, 2008
7442359 Recovery of sulphuric acid Oct. 28, 2008
7360550 System for recycling spent sulfuric acid, method for recycling spent sulfuric waste liquid, and recycled sulfuric acid Apr. 22, 2008
7351391 System and method for converting the spent remnants of a first pickling acid solution into a usable second pickling acid solution Apr. 1, 2008
7344692 Process for regenerating spent sulfuric acid Mar. 18, 2008
7273599 Method for decoloring sulfuric acid Sep. 25, 2007
7232554 Process for recovering arsenic from acidic aqueous solution Jun. 19, 2007
7033565 Production of sulphuric acid from a feed gas with varying concentration of sulphur dioxide Apr. 25, 2006
6740302 Method for producing high-purity sulphuric acid May. 25, 2004
6649070 Method for utilizing sulfuric acid/peroxide liquid mixture Nov. 18, 2003
6641791 Generation of boron-trifluoride and sulphuric acid from boron trifluoride hydrate Nov. 4, 2003
6627172 Process for preparing sulphuric acid from gases containing SO3 and gaseous nitrosylsulphuric acid Sep. 30, 2003
6548038 Process for the concentration of dilute sulphuric acid solutions Apr. 15, 2003
6495024 Method for the removal of arsenic from sulfuric acid solution Dec. 17, 2002
6337061 Method for reclaiming metal sulfate-containing waste sulfuric acid Jan. 8, 2002
6332949 Method for upgrading used sulfuric acids Dec. 25, 2001
6315975 Suspension system using fumed silica Nov. 13, 2001
6238639 Process for removing NOx from nitrosylsulphuric acid May. 29, 2001
6214304 Method of removing mercury from a mercury-containing flue gas Apr. 10, 2001
6159382 Waste acid recovery Dec. 12, 2000
6156288 Process for purifying and concentrating spent sulfuric acids Dec. 5, 2000
6106795 Liquid hydrate regeneration of contaminated acids Aug. 22, 2000
6083470 Process for removing organic phosphorous compounds and other impurities from dilute sulfuric acid Jul. 4, 2000
5955050 No.sub.x destruction in sulphuric acid Sep. 21, 1999
5948264 Ion exchange and regeneration process for separation and removal of iron (III) ions from aqueous sulfuric acid metal ion-containing solutions Sep. 7, 1999
5792441 Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and feeds stream Aug. 11, 1998
5730950 Sulfuric acid waste recycling by regenerative process Mar. 24, 1998
5711928 Process for producing high-purity sulfuric acid Jan. 27, 1998
5683671 Process for purifying sulfuric acid Nov. 4, 1997
5674466 Method of producing chlorine dioxide Oct. 7, 1997
5670128 Regeneration of sulfuric acid from sulfate by-products of 2-hydoxy-4-(methylthio) butyric acid manufacture Sep. 23, 1997
5632866 Point-of-use recycling of wafer cleaning substances May. 27, 1997
5628976 Cofiring biosolids in a spent sulfuric acid regeneration facility May. 13, 1997
5603839 Process for the recovery of waste sulphuric acid Feb. 18, 1997
5582737 Ion exchange and regeneration process for separation and removal of iron (III) ions from aqueous sulfuric acid metal ion-containing solutions Dec. 10, 1996
5549833 Method of decomposing hydrogen peroxide Aug. 27, 1996
5547655 Recovery and regeneration of sulfuric acid Aug. 20, 1996
5527985 Process for recycling waste sulfuric acid Jun. 18, 1996
5501847 Process for purifying impure sulphuric acid Mar. 26, 1996
5500096 Method of concentrating less volatile liquids Mar. 19, 1996
5500095 High efficiency chemical processing Mar. 19, 1996
5498790 Regeneration of sulfuric acid from sulfate by-products of 2-hydroxy-4-(methylthio)butyric acid manufacture Mar. 12, 1996

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