A combined process of light olefin hydrogenation and alcohol dehydrogenation

Abstract

The invention discloses a low carbon olefin hydrogenation and alcohol dehydrogenation combination process, hydrogenation and dehydrogenation reactions are performed in a hydrogenation reaction tube and a dehydrogenation reaction tube parallelly arranged in a tubular reactor, and a heat conducting medium in a reactor shell side is used for heat exchange. The characteristics of heat release of an olefin hydrogenation reaction and heat absorption of an alcohol dehydrogenation reaction can be fully utilized, heat released by the olefin reaction is supplied for heating of the dehydrogenation reaction, and the heat absorption and the heat release of the two reactions are better matched for balance, so that the two reactions both can be performed at a constant temperature, temperature rise of reaction tubes from top to bottom can be avoided, coking and other side reactions can be reduced, and the service life of the catalyst can be prolonged. The hydrogenation reaction needs no additional heat removal, the dehydrogenation reaction needs no additional heating, a heating and cooling process are omitted, the technological process is simplified, and equipment investment and operation cost can be saved.

Description

technical field [0001] The invention relates to a combined process for chemical production, in particular to a combined process for hydrogenation of light olefins and dehydrogenation of sec-butanol. Background technique [0002] With the development and technological progress of oil refining and chemical industry, the by-products of ethylene cracking and the deep processing of refinery gas (C4 or C5 fraction) are getting more and more attention. There are many ways to use them, such as ethylene cracking raw materials after hydrogenation, raw materials for the synthesis of maleic anhydride, liquefied petroleum gas for vehicles, etc.; hydrogenation treatment with C4 or C5 fractions as raw materials, because the raw materials are abundant and the product consumption is large , involving many production devices, so it has attracted much attention. [0003] The method of hydrogenation of industrial C4 or C5 fraction to prepare ethylene cracking material is to hydrogenate the ole...

AI Technical Summary

Problems solved by technology

Although it is technically feasible to carry out the hydrogenation of low-carbon olefins with this method, the disadvantage is that the hydrogenation reaction of low-carbon olefins is a strong exothermic reaction. As the reaction progresses, the heat release becomes more and more. The temperature of the layer cannot be overheated, and the heat of reaction needs to be removed continuously, but the temperature rise of the bed layer cannot be avoided, and the heat of reaction has not been fully and effectively utilized

Although the method of alcohol dehydrogenation to ketone is technically feasible and mature, the disadvantage is that the reaction of alcohol dehydrogenation to ketone is a strong endothermic reaction. As the reaction progresses, the heat required for the reaction increases gradually. In order to keep the temperature of the reaction bed at a suitable reaction temperature, it is necessary to continuously input heat into the reaction bed, which not only consumes a large amount of energy, but also cannot avoid the temperature difference between the upper and lower sides of the reactor bed.

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