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acetaldehyde acetic acid acetone acetylene acrolein acrylic acid acrylonitrile activity aldehyde ammonia antimony atmospheres pressure benzoic acid British Patent butadiene butane butene butylene carbon dioxide catalyst catalyst system catalytic oxidation Chem chemical cobalt column compounds concentration conversion of propylene cumene dehydrogenation effect employed ethyl benzene ethylene oxide extractive distillation feed fixed bed fluidised bed reactor formation formed fraction gases grams graph heat of reaction homogeneous liquid phase Houdry process Hydroc hydrocarbon hydrogen cyanide hydroperoxide increases initial ions isobutylene isopentene isoprene isopropyl kcal/mol kinetic manufacture metal methacrylonitrile mixture molar ratio moles naphthalene obtained olefins oxidation processes oxidation reactions oxidative dehydrogenation oxidised oxygen p-toluic acid p-xylene partial pressure phenol phthalic anhydride purity reactant reacted reaction temperature recycled regeneration respectively salts secondary products selectivity separation silica solution solvent space velocity steam step styrene technological terephthalic acid toluene tons total conversion U.S. Patent utilised water vapour yield