RU95119074A - Method of preparing catalyst for aniline synthesis - Google Patents

Abstract

FIELD: catalysts in industrial organic synthesis. SUBSTANCE: invention relates to improved method of aniline production via vapor-phase hydrogenation of nitrobenzene and may find use in dye production as well as in petrochemical industry for hydrogenation of nitro compounds into primary amines suitable for caprolactam production. Method is distinguished with that, as a carrier, aluminium hydroxide is used, which is mixed with a vanadium compound in presence of nitric acid with acid modulus 0.015-0.1 and water followed by extrusion, drying, calcination, and impregnation of extrudates obtained with aqueous solution of nickel and copper salts. Compared to catalysts prepared following known procedures, catalyst of invention, requiring less effort and power consumption, is more selective. Simpler procedure of preparation reduces outbursts into atmosphere. EFFECT: reduced cost and increased selectivity.

Claims (1)

Изобретение относится к усовершенствованному способу получения анилина гидрированием нитробензола в паровой фазе и может быть использовано в производстве красителей, а также в нефтехимической промышленности для гидрирования нитросоединений в первичные амины, применяемые в производстве капролактама. Способ отличается тем, что в качестве носителя используют гидроксид алюминия, смешивают его с соединением ванадия в присутствии азотной кислоты модулем 0,015 - 0,1 и воды с последующей экструзией, сушкой, прокалкой и пропиткой полученных экструдатов водным раствором солей никеля и меди. Катализатор, полученный по предлагаемой технологии, обладает меньшей трудо- и энергоемкостью и более высокой селективностью. Кроме того, происходит упрощение технологии, значительно уменьшаются энергозатраты, сокращаются выбросы в атмосферу.The invention relates to an improved method for producing aniline by hydrogenation of nitrobenzene in the vapor phase and can be used in the manufacture of dyes, as well as in the petrochemical industry for the hydrogenation of nitro compounds to primary amines used in the production of caprolactam. The method is characterized in that aluminum hydroxide is used as a carrier, it is mixed with a vanadium compound in the presence of nitric acid with a module of 0.015 - 0.1 and water, followed by extrusion, drying, calcination and impregnation of the obtained extrudates with an aqueous solution of nickel and copper salts. The catalyst obtained by the proposed technology has less labor and energy consumption and higher selectivity. In addition, technology is being simplified, energy costs are significantly reduced, and air emissions are reduced.