Fluidized bed Tropsch synthesis method for heavy hydrocarbons

Abstract

The invention relates to a Tropsch synthesis method for heavy hydrocarbons, which mainly solves the problems that the reaction heat dissipation is difficult, temperature runaway is easily caused and the catalyst is easily inactivated when a fixed bed is used and the selectivity of the heavy hydrocarbons is low when a fluidized bed is used in the prior art because the Tropsch synthesis reaction is strong heat generating reaction. Synthesis gas is used as a raw material; under the conditions that the reaction pressure is 0.5 to 10MPa, the reaction temperature is 200 to 600 DEG C, the reaction space velocity is 100 to 8,000 per hour and the H2 / CO molar ratio of the raw material gas is 0.1-5.0: 1, the raw material is contacted with a cobalt-based fluidized bed catalyst in the fluidized bed and reacted to generate the heavy hydrocarbons, wherein the heavy hydrocarbons are hydrocarbons of over C5; and in the cobalt-based fluidized bed catalyst, at least one of oxides of Si and Al or mixture of Si or Al and ZrO2 is selected as a carrier, and the active ingredient contains the following compound with chemical formula in an atomic ratio: Co100AaBbOx, wherein in the formula, A is selected from at least one of alkali metals or alkaline earth metals, and B is selected from at least one of Cr, Ni, Cu and Zn. According to the technical scheme, the problems are well solved, and the method can be used in the industrial production of fluidized bed Tropsch synthesis reaction.

Description

technical field [0001] The invention relates to a method for synthesizing heavy hydrocarbons in a fluidized bed Fischer-Tropsch. Background technique [0002] The method of converting synthesis gas into liquid hydrocarbons through catalyst action was invented by German scientists Frans Fischer and Hans Tropsch in 1923, referred to as F-T synthesis, that is, CO undergoes a heterogeneous catalytic hydrogenation reaction on a metal catalyst to produce linear alkanes and Olefin-based mixture process. Germany carried out research and development in the 1920s and realized industrialization in 1936. After World War II, it was closed because it could not compete economically with the oil industry; South Africa has abundant coal resources, but lacks oil resources and has long-term Restricted by international social economic and political sanctions, it was forced to develop coal-to-oil industrial technology, and built the first coal-based F-T synthetic oil plant (Sasol-1) with a prod...

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Problems solved by technology

[0006] The technical problem to be solved by this invention is that in the prior art, because the Fischer-Tropsch synthesis reaction is a strong exothermic reaction, when using a fixed bed, the reaction is difficult to remove heat, and the temperature is easy to fly, so that the catalyst is easily deactivated; when using a fluidized bed, select To solve the problem of low stability, provide a new method for the synthesis of heavy hydrocarbons in a fluidized bed Fischer-Tropsch

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