Abstract: A method for preparing a proof for plate printing, which comprises applying inkjet printing to an ink receiving layer of a recording medium having the ink receiving layer formed on the surface of a support made of plate printing paper for regular printing or made of paper having substantially the same brightness and glossiness as such plate printing paper, to obtain a printing proof.

Abstract: A process for producing trifluoroacetic acid and trifluoroacetyl chloride from 1,1-dichloro-2,2,2-trifluoroethane, oxygen and water as starting materials, characterized in that the starting materials are reacted in a vapor phase in a reactor of perfect mixing type to avoid local heating, under a condition not to liquefy the starting materials and reaction products, while continuously supplying the starting materials and continuously withdrawing the reaction products, so as to obtain a reaction mixture comprising trifluoroacetyl chloride as the main product and trifluoroacetic acid as an accompanying product.

Abstract: Disclosed is a method for the purification of Japanese encephalitis virus, which comprises subjecting a solution containing the Japanese encephalitis virus to column chromatography using, as a gel for chromatography, a sulfuric acid ester of cellulose or a crosslinked polysaccharide. The method can provide highly purified Japanese encephalitis virus, which is useful for obtaining an effective vaccine against Japanese encephalitis.

Abstract: SF.sub.6 is produced by a pyrolysis of SF.sub.5 Cl obtained by a reaction of sulfur or sulfur chloride with chlorine and an amine/hydrogen fluoride complex or a reaction of sulfur tetrafluoride with chlorine and an amine/hydrogen fluoride complex.

Abstract: In a process for producing methacrylic acid by two step oxidation comprising a first oxidation step of producing methacrolein by reacting isobutylene with molecular oxygen in the presence of a diluent gas and a catalyst, and a second oxidation step of producing methacrylic acid by reacting methacrolein with molecular oxygen in the presence of a diluent gas and a catalyst, the improvement comprises using nitrogen as the diluent gas in the first oxidation step and nitrogen and steam as the diluent gas in the second oxidation step, mixing the reaction products obtained in the first and second oxidation steps, separating and recovering methacrolein and methacrylic acid from the mixture and feeding the recovered methacrolein back into the second oxidation step as a starting material.