Abstract: A polyimide compound crosslinked with a polyamine which is soluble in the specific solvent is produced by dehydration and condensation of amino acid or salt thereof and polyamine in an organic solvent under the presence of protonic acid. In the case of using a polyamine having low solubility to an organic solvent such as lysine and ornithine, the reaction rate of the polymerization can be increased by adding a polyamine in the step before or at the initial step of polymerization because water which is contained in the raw material or produced in the dehydration reaction serves as a good solvent for the polyamine.

Abstract: An economical and industrial method for the dehydrogenation of triisopropyl benzene can be provided by carrying out the reaction employing a solid catalyst having an iron compound and potassium compound as major components or an iron compound, potassium compound, and magnesium compound as major components, as a dehydrogenating catalyst for producing diisopropyl isopropenyl benzene, isopropyl diisopropenyl benzene and/or triisopropenyl benzene from triisopropyl benzene. In the dehydrogenation of triisopropyl benzene or diisopropyl benzene, by carrying out an off-and-on reaction in which the above described solid catalyst is employed and with which a regeneration period with steam or oxygen or air is provided, an economical and industrial dehydrogenation method having an extended life of the catalyst can be provided and will have an industrial superiority.

Abstract: A copper catalyst obtained by reducing a precursor containing copper and aluminum and not containing substantially malachite and aluminum hydroxide permits preparation of amides with a high productivity and in a high selectivity by the hydration of nitrites.

Abstract: At least one of ammonia and ethylenediamine is reacted with monoethanolamine in the presence of a catalyst containing phosphoric acid or its condensate in order to prepare acyclic ethyleneamines, and the catalyst can be improved in performance and the life of the catalyst can be prolonged by feeding a phosphorus-containing material to a reaction system during the reaction. In addition, the catalyst having a deteriorated performance can be reactivated by adding the phosphorus-containing material to the catalyst.

Abstract: Ethylene is oxidized into ethylene oxide by bringing a feed gas mixture, which contains the ethylene, oxygen and at least 1 vol. % of carbon dioxide as well as at least 0.5 vol. ppm of a chlorine-containing burning reaction decelerator and at least 1 vol. ppm as calculated in terms of nitrogen monoxide of a nitrogen oxide and/or a precursor thereof, into contact with a catalyst which carries silver and as a practically sole alkali metal, rubidium at an Rb/Ag atomic ratio of 2/1000-7/1000 on a fire-resistant carrier having a specific surface area of 1 m.sup.2 /g or smaller.

Abstract: A gasification process for forming a gas mixture containing hydrogen wherein a hydrocarbon including a heavy residual oil is atomized with a mixture of an oxygen-containing gas and steam in an atomizing zone, the formed jet streams containing the atomized hydrocarbon drops are introduced to the catalyst bed while adjusting the residence time in the atomizing zone to 0.05 to 5 seconds, substantially without forming eddy currents and the reaction is carried out at a temperature of at least 850.degree. C. to form said gas mixture while avoiding deposition of solid carbon on said catalyst bed.