Process for nitrogen oxides reduction with minimization of the production of other pollutants

New Patents are more efficiently handled by an exhaust or collecting system.

4~2488 PROCESS FOR NITROGEN OXIDES REDUCTION WITH MINIMIZATION OF THE PRODUCTION OF OTHER POLLUTANTS William R Epperly, John H O'Leary, James C Sullivan, Barry N Sprague assigned to Fuel Tech Inc A process for the reduction of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel while minimizing the production of other pollutants is presented. The process comprises introducing a nitrogen oxides reducing treatment agent comprising an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1 into an effluent according to a nitrogen oxides reducing treatment regimen under condition such that the treatment agent is operating on the high temperature or right side of its nitrogen oxides reduction versus effluent temperature curve, especially on the high temperature or right side of the curve plateau.

4~25~ PROCESS FOR THE PROTECTION OF STONE MATERIALS, MARBLE, BRICKS AND CONCRETE FROM ATMOSPHERIC AGENTS AND POLLUTANTS AND FOR THE PROTECTION OF THE SURFACE OF SUCH MATERIALS FROM THE DECAY CAUSED BY MURAL WRITINGS WITH PAINTS, AND THE LIKE Franco Piacenti, Del Fa' Carlo Manganelli, Giovanni Moggi, Adolfo Pasetti, Andrea Scala, Florence, Italy assigned to Ausimont S p A; Consiglio Nazionale Del Process for the protection of stone materials, marble, bricks, and concrete, and of structures made from such materials, against the decay caused by atmospheric agents and pollutants, by applying to the surface of said materials or structures a mixture which is constituted by: (1) poly-

tetrafluoroethylene in the form of a fine powder; (2) a perfluoropolyether not bearing functional groups; and/or (3) a perfluoropolyether or a fluoropolyether having a chain end, or both chain ends, constituted by functional groups which are capable of forming a chemical and/or physical bond with the material to be protected. The invention also relates to a process for preventing, on the normal materials for building industry and lining materials, the decay effects caused by writings made by using spray paits or brush paints, inks, and the like.

4905614 METHOD FOR THERMIC DISPOSAL OF WASTE MATERIALS Wolfgang Grigel, Jakob Hinterkeuser, HeinzDiete Waldhecker, John Rizzon, Kariheinz Passler, Lohmar, Federal Republic Of Germany assigned to Klockner-Humboldt-Deutz Aktiengesellschaft Waste materials, potentially following their comminution and potentially following their dying or, respectively, preheating, are burned in a cyclone kiln (buring cyclone or, melting cyclone) at extremely high temperatures above 1500 degrees C. with formation of a molten slag low in noxious substances and a hot exhaust gas in which latter the valuable substances and/or noxious substances contained in the waste materials volatilize, whereby dusts enriched with valuable substances on the one hand and, on the other hand, dusts enriched with noxious substances are respectively separately separated out of the exhaust gas by partial condensation.

4906257 METHOD OF AND APPARATUS FOR TREATING WASTE GAS FROM SEMICONDUCTOR MANUFACTURING PROCESS Akira Fukunaga, Manabu Tsujimura, Masaaki Ohsato, Kanagawa, Japan assigned to Takeda Chemical Industries Ltd A method of and apparatus for treating waste gas from semiconductor manufacturing equipment with a dry solid absorbent. A bypass pipe which is equipped with a bypass valve is provided between inlet and outlet pipes of a con-