Abstract: Disclosed is a catalyst composition comprising a mixture of solid fumaric acid and solid barium chromate useful in removing impurities and residual moisture from such sources as organic drycleaning solvents and petroleum fuels, and methods of using the catalyst composition.

Abstract: A method for removing impurities and residual moisture from a petroleum fuel comprising:(a) circulating said fuel through a first filter apparatus made up of a cellulosic material containing a solid organic acid and a chromate compound; and(b) circulating said fuel from step (a) through a second filter apparatus containing a cellulosic material containing water; and(c) during steps (a) and (b) maintaining an electric grounding of said first filter apparatus via a DC power supply placed in between said first and second filters.

Abstract: Residual moisture and sulfur and other residual reducing agent impurities contained in automotive fuels and fuel oils are removed by adding to the fuel a chromate compound or a solid acid and circulating the fuel through a filter system comprising at least one filter made up of a cellulosic material attached to a D.C. power supply, and containing a chromate compound or a solid acid, whichever is not previously added to the fuel.

Abstract: Residual moisture and sulfur and other residual reducing agent impurities contained in drycleaning solvents are removed by adding to the solvents an unsubstituted aromatic hydrocarbon or a halogen or alkyl substituted aromatic hydrocarbon and circulating the hydrocarbon-containing solvent through a filter system comprising two filters; one filter containing a solid acid and the other containing chromate compound.

Abstract: A method for removing sulfur impurities from petroleum liquids comprising adding to the petroleum liquid a fatty acid, naphthalene, water and a cellulosic container containing a cellulosic material coated with a chromate compound.