Lower alkane aromatization reaction-regeneration system construction process

Abstract

The present invention relates to a lower alkane aromatization reaction-regeneration system construction process, wherein lower alkane is adopted as a raw material, a fluidized bed reactor is used, and the raw material is subjected to anaerobic aromatization at a high temperature with a catalyst so as to convert into aromatic hydrocarbon products adopting benzene and naphthalene as main components and hydrogen products. According to the present invention, in order to avoid the rapid deactivation of the catalyst, the partially-deactivated catalyst is conveyed into the regeneration reactor through the riser in the reactor, the deactivated catalyst is regenerated by using H2 at the high temperature, and the regenerated catalyst is conveyed to the reactor through the material supply device so as to be subjected to a catalysis reaction, such that the continuous reaction and regeneration circulation of the catalyst in the system is achieved; and the key process parameters of the lower alkane high temperature circulation aromatization fluidization reaction and continuous regeneration are specified, such that the high conversion rate of the lower alkane, the high aromatic hydrocarbon yield, the good regeneration effect of the deactivated catalyst, and the stable catalyst reaction performance are obtained.

Description

technical field [0001] The invention belongs to the technical field of conversion and utilization of lower alkanes, and relates to catalytic conversion of lower alkanes into aromatic hydrocarbons and hydrogen products at high temperature by using a fluidized bed aromatization reactor, especially a lower alkane aromatization reaction-regeneration system construction craft. Background technique [0002] Lower alkanes, especially methane, account for a considerable proportion of hydrocarbon resources, and their efficient development and utilization has always been one of the global hotspots to improve the utilization value of hydrocarbon resources. Due to their stable chemical properties, lower alkanes require a large amount of energy to convert them into high value-added products. On the other hand, benzene series, as important chemical raw materials, are increasingly used in various fields. At present, benzene has a single source, and most of it can only be obtained by reac...

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Problems solved by technology

[0005] CN1183398A uses catalytic cracking tail gas as a raw material to produce aromatics through oxygen-free aromatization, but because the temperature selected by this method is low (823K~973K), the catalytic conversion rate and product yield are low

However, this invention puts forward higher requirements for the production and stability of the molecular sieve / carbon composite membrane at high temperature, and it cannot be promoted industrially at present.

[0008] CN102482179A introduces that after the oxygen-free aromatization reaction of lower alkanes in the fluidized bed reactor, the deactivated catalyst is regenerated in the regeneration reactor, and the specific heat and thermal conductivity are improved by adding inert solid particles in the catalyst, thereby maintaining Heat balance between reactor and regenerator, however, addition of inert solid particles reduces feedstock throughput per unit volume of reactor

In order to supplement heat for the reaction, the invention mixes inert solid particles into the catalyst, and the heat released during the regeneration process is brought into the reactor by the solid particles to provide heat for the reaction. In order to make up for the lack of heat released by the regeneration reaction, the invention will The catalyst is separated from the inert solid material, and the solid material is heated separately and then mixed with the catalyst into the reactor, which can further provide more heat for the reaction, but this invention will also reduce the raw material handling capacity per unit volume of the reactor while increasing the complexity of the process

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