Method for producing low-carbon olefins by using fixed bed

Abstract

The invention relates to a method for producing low-carbon olefins by using a fixed bed. The method mainly solves the problems of a low conversion rate of CO and low selectivity of the low-carbon olefins in the reaction process of producing the low-carbon olefins from synthesis gas by using the fixed bed in the prior art. According to the technical scheme, a catalyst adopted by the method comprises the following components, by weight percentage, a) 10-50% of Fe or an oxide thereof, b) 1-5% of Rh or an oxide thereof, c) 9-30% of at least one element selected from Cu and Zn or at least one oxide thereof, d) 9-30% of at least one element selected from K and Cs or at least one oxide thereof, e) 1-5% of Pr or an oxide thereof, and f) 30-70% of a carrier which comprises the following components, based on the weight of the carrier, (1) 20-70 parts of titanium oxide, and (2) 30-80 parts of silicon dioxide. The problems can be well solved through the above technical scheme, and the method can be applied to industrial production of preparing the low-carbon olefins from the synthesis gas by using the fixed bed.

Description

technical field [0001] The invention relates to a method for producing light olefins in a fixed bed. Background technique [0002] Low-carbon olefins refer to olefins with carbon atoms less than or equal to 4. Low-carbon olefins represented by ethylene and propylene are very important basic organic chemical raw materials. With the rapid growth of my country's economy, the supply of low-carbon olefins has been in short supply for a long time. At present, the production of low-carbon olefins mainly adopts the petrochemical route of cracking light hydrocarbons (ethane, naphtha, light diesel oil). Due to the increasing shortage of global oil resources and the long-term high price of crude oil, the development of low-carbon olefins industry only relies on oil The tubular cracking furnace process with light hydrocarbons as raw materials will encounter more and more raw material problems, and the production process and raw materials of low-carbon olefins must be diversified. One-...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low CO conversion rate and low selectivity of low-carbon olefins in the product in the fixed-bed production of low-carbon olefins technology in the prior art, and a new method for fixed-bed production of low-carbon olefins is provided. The method uses a new type of fixed-bed low-carbon olefin iron-based catalyst, which has the advantages of high conversion rate of CO and high selectivity of low-carbon olefins in the product

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