Obtaining method of a brown pigment of azomethine type
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Process for reticulating polyolefins
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Process for the preparation of azobisisobutyronitrile
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Process for obtaining 4-nitro-1, 2-phenylenediamine
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Process for stabilizing guaiazulene solutions of photooxydable pharmaceutical products
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Flame-resistant recovered cellulosic fiber
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Process for purifying crude hydroxyethylcelulose
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Procedure for obtaining vinyl ethyl-acetate copolimers
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Benzocycloheptenic amines and process for obtaining
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Chrome-alumina extruded catalysts - of increased strength by impregnating mixed easily and difficultly peptized alumina particles with aq. chromic acid
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Continuous control of Friedel Crafts catalyst activity - using an electrical conductivity cell to indicate addn of fresh catalyst