Method for preparing styrene by oxydehydrogenation

Abstract

This invention provides a reaction method for producing phenylethene by ethylbenzene dehydrogenation and hydroxidization. The dehydrogenation reactor applies radial reactor or axial radial reactor. Inside the bed fills dehydrogenation catalyst. The oxidative dehydrogenation reactor applies oxidative layer and absorbed layer double radial and dehydrogenation layer single radial compound bed form or absorbed layer, oxidative layer and dehydrogenation layer three radial compound bed form. The reaction material passes through sequentially the potassium adsorbed layer, oxidative catalyst layer and dehydrogenation catalyst layer in the oxidative dehydrogenation reactor. This invention is characterized of good potassium removing effect, low reactor pressure decrease, homogenous bed layer temperature distribution and simple reactor structure.

Description

technical field [0001] The invention belongs to the technical field of hydrocarbon processing, and relates to a reaction method for producing styrene by hydrogen oxidation, and is especially suitable for the process transformation of traditional ethylbenzene dehydrogenation for producing styrene. Background technique [0002] The dehydrogenation of ethylbenzene to styrene and hydrogen is an equilibrium reaction with endothermic and molecular number increase. Using negative pressure, raising the reaction temperature, and using a new type of ethylbenzene dehydrogenation catalyst can increase the single-pass conversion of ethylbenzene, but it is still limited by the equilibrium. In order to improve the influence of equilibrium on the reaction, the generated hydrogen reacts with oxygen in the process, which is not only beneficial to the production of styrene, but also provides heat for the dehydrogenation of ethylbenzene, so it has become a promising new process. [0003] Paten...

AI Technical Summary

Problems solved by technology

[0007] For the above process, there are the following problems: using an axial reactor, the pressure drop of the bed layer is large, which does not meet the requirements of the ethylbenzene dehydrogenation reaction process; the oxide layer and the dehydrogenation layer are combined, and the oxide layer is extremely thin to prevent deep oxidation of the reaction gas. , there is a serious risk of affecting the oxidation reaction and dehydrogenation reaction due to uneven distribution; the potassium adsorption layer is placed directly behind the dehydrogenation layer, and the potassium removal effect of the adsorption layer is poor due to the high temperature of the reaction gas

Images