A fluidized bed reaction device and method for alkane dehydrogenation to olefins

Abstract

The invention discloses a fluidized bed reaction device and method for producing alkenes from alkane dehydrogenation, belonging to the field of alkenes preparation. The fluidized bed reaction device includes a reactor, a regenerator, a pre-sulfurization section and some auxiliary equipment. The reactors are connected. The method is operated according to the following steps: firstly, the sulfide catalyst is prepared, and then the processes of catalytic dehydrogenation, sulfide catalyst regeneration and presulfidation are completed in the fluidized bed reaction device. In the present invention, by adopting the above device and method, the olefin preparation process is continuously carried out in a cycle, the catalyst is always in a fluidized state in the reactor, regenerator and presulfurization section, and the surface active components of the sulfide catalyst always exist in the form of sulfide, maintaining the Higher catalytic activity and selectivity improve production efficiency, heat transfer efficiency and product yield.

Description

technical field [0001] The invention relates to the field of olefin preparation, in particular to a fluidized bed reaction device and method for producing olefins from alkane dehydrogenation. Background technique [0002] Petrochemical industry is an important pillar industry in today's national economy, and ethylene, propylene and butene (including 1-butene, 2-butene and isobutene) are important petrochemical basic raw materials. Olefins are widely used and can be used to prepare rubber and plastic. Dehydrogenation of alkanes to olefins is an important process for industrial production of olefins. This method can not only make full use of cheap and easily available alkane resources, but also provide hydrogen sources for refineries to produce clean oil products, thereby improving the comprehensive utilization of oil and gas resources. Therefore, In recent years, it has received more and more attention from technical workers. [0003] In the technology of catalytic dehydrog...

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Problems solved by technology

[0006] Restricted by thermodynamic equilibrium, the catalytic dehydrogenation reaction of propane, butane, etc. needs to be carried out under high temperature and low pressure conditions, and high temperature reaction conditions tend to accelerate the reaction of Pt catalyst and Cr 2 o 3 Catalyst deactivation due to coking, thereby reducing the activity and selectivity of the catalyst, and reducing the yield of the product

[0007] If a fixed bed reactor is used for the reaction of alkanes to olefins, the regeneration period of the catalyst is only tens of minutes. Frequent reactions and regenerations bring great inconvenience and safety risks to production operations. If a moving bed reactor is used, although it can achieve Continuous reaction and regeneration, but the device structure is complicated and the investment is high; and in order to achieve an economically acceptable per-pass conversion rate of alkanes to olefins, the reaction temperature is generally close to 600°C, or even above 600°C, and alkane dehydrogenation is a strong absorption Thermal reaction, using a fixed bed or moving bed reactor, how to supply heat for the reaction has become the primary problem to be solved in engineering. After all, no matter whether the supported Pt catalyst or Cr 2 o 3 Catalyst, the main component of which is Al 2 o 3 Metal oxides such as metal oxides are poor conductors of heat. Whether the catalyst is in a stationary or moving state, its heat transfer performance is not ideal; and if a fluidized bed reactor is used, although the problem of heat transfer can be solved, the supported Pt The catalyst is too expensive, supported Cr 2 o 3 The catalyst is poisonous and not suitable for use in circulating fluidized bed reactors

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