Olefin preparation method comprising reduction pretreatment

Abstract

The present invention enables more effective increase in an olefin yield by means of applying a novel catalyst and reduction pretreatment to a circulating fluidized bed process, which uses a high-speed fluidized bed, and thus enhancing the selectivity and yield. By means of the reduction pretreatment, hydrocarbon is prevented from coming into contact with a catalyst during the early part of a reaction and thus is prevented from converting into an unnecessary by-product. Therefore, the conversion from the hydrocarbon to olefin is simple, the catalyst can be efficiently utilized, and unnecessaryapparatuses are reduced and the facility cost can be lowered. Since the catalyst is directly heated by means of a catalytic reaction of the pretreatment process, the energy cost for increasing catalyst reaction temperature can be saved compared to the existing indirect heating. Since the number of compressor gears is reduced by means of positive pressure operation, investment cost for an apparatus is reduced.

Description

technical field [0001] The present invention relates to a process for the production of olefins utilizing a circulating fluidized bed process including reducing pretreatment. Background technique [0002] Olefins such as ethylene, propylene are widely used in the petrochemical industry. Generally, such olefins are obtained in the pyrolysis process of naphtha. However, due to the shale gas revolution, etc., the competitiveness of processes using lower hydrocarbons as raw materials has gradually increased, and an on-purpose olefin production process through a catalytic dehydrogenation process is required. [0003] The catalytic contact dehydrogenation process required for olefin production uses various types of lower hydrocarbon compounds as raw materials, showing excellent olefin production yields. However, in the fixed-bed commercial dehydrogenation process, although the yield of olefins is high at the initial stage of the reaction when the hydrocarbons are in contact with...

AI Technical Summary

Problems solved by technology

[0012] However, even in the process of limiting the contact time between the hydrocarbon and the catalyst, at the initial stage of the reaction, the hydrocarbon reacts with the catalyst to rapidly generate by-products such as carbon dioxide and carbon monoxide that are not olefins. Although the conversion rate of the reaction raw material is high, there is a high selectivity. low disadvantage

In addition, the process stability that directly affects the life of the catalyst is low, and there are still problems that have an adverse effect on the overall process performance

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