On-line sulfuration fluidized bed reaction device for olefin production by alkane dehydrogenation and method

Abstract

The invention discloses an on-line sulfuration fluidized bed reaction device for olefin production by alkane dehydrogenation and a method, and belongs to the field of olefin preparation. The fluidized bed reaction device comprises a reactor, a regenerator, a pre-sulfurization machine and some accessory devices. One end of the pre-sulfurization machine is connected to the regenerator, and the other end is connected to the reactor. The method includes steps of: preparing a sulfide catalyst, and performing a catalytic dehydrogenation reaction, a sulfide catalyst regeneration process and a pre-sulfurization process in the fluidized bed reaction device. By adoption of the fluidized bed reaction device and the method, an olefin preparation process is cyclic and performed continuously, the catalyst is in a fluidized state all the time in the reactor, the regenerator and the pre-sulfurization machine and a sulfide catalyst surface active component is in a form of a sulfide all the time, thus maintaining high catalytic activity and selectivity, and increasing the production efficiency, the heat transfer efficiency and the 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 on-line sulfurized alkane dehydrogenation to olefin. 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 de...

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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 endothermic 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 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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