Method for producing low-carbon olefins by using petroleum hydrocarbon

Abstract

The invention discloses a method for producing low-carbon olefins by using petroleum hydrocarbon. The method comprises the following steps of: making a preheated petroleum hydrocarbon raw material contact a hydrogen combustion catalyst in a hydrogen combustion heating area to directly obtain heat, which is required by the dehydrogenization of the petroleum hydrocarbon, of a hydrogen combustion reaction; allowing the petroleum hydrocarbon to contact a dehydrogenization catalyst in a dehydrogenization area to obtain petroleum hydrocarbon material flow which contains unsaturated olefin compounds, wherein the conversion rate of a dehydrogenization reaction is at least 20 percent; and allowing the obtained petroleum hydrocarbon material flow which contains the unsaturated olefin compounds to contact an olefin cracking catalyst in an olefin cracking reaction area to obtain a petroleum hydrocarbon material flow which contains C2 to C9 olefins and separating the petroleum hydrocarbon material flow which contains C2 to C9 olefins to obtain low-carbon products. When the technical process of the invention is used for producing the low-carbon olefins, the heat transfer effect and the heat transfer efficiency are improved, the energy is saved, the environment is protected, the energy consumption in a separation process is reduced and the low-carbon olefin selectivity of the petroleum olefin raw materials is obviously improved.

Description

Technical field [0001] The present invention relates to a method for producing olefins from petroleum saturated hydrocarbons. More specifically, the present invention relates to a 4 -C 35 Saturated hydrocarbons are used as raw materials to produce low-carbon olefins, especially ethylene, propylene and butene. Background technique [0002] As we all know, the production of low-carbon olefins by cracking petroleum hydrocarbons is a high temperature and strong endothermic process. At present, the most common method for producing low-carbon olefins such as ethylene, propylene and butadiene from petroleum saturated hydrocarbons is steam cracking. About 99% of ethylene and more than 50% of propylene in the world are produced by this method. Since the production of steam cracking methods is currently operated under very harsh conditions, for example, the final temperature of the radiant section of the cracking furnace reaches or exceeds 1125°C, and the residence time of the material in...

AI Technical Summary

Problems solved by technology

The steam thermal cracking process currently used in industry and the naphtha fixed-bed catalytic cracking process under research face the problems of huge energy demand and low heat transfer efficiency of providing ultra-high temperature through external indirect heating.

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