Method for preparing light-weight fuel oil and propylene from inferior raw oil

Abstract

The invention provides a method for preparing light-weight fuel oil and propylene from inferior raw oil. The method comprises the following steps that: the inferior raw oil enters a first and second reaction areas of a catalytic conversion reactor in sequence to contact the catalytic conversion catalyst to undergo the primary reaction and the secondary reaction, the reaction products and the spent catalyst undergo solid-liquid separation, and the spent catalyst undergoes steam stripping and singeing in sequence and then is returned to the reactor for recycling; the reaction products are separated to obtain propylene, gasoline, catalytic wax oil and other products, wherein the catalytic wax oil enters an aromatic extraction device for separation so as to obtain extract oil and raffinate oil; and the raffinate oil is cycled to the first reaction area of the catalytic conversion reactor or / and other catalytic conversion devices for further reaction to obtain the target products of propylene and gasoline. In the method, the inferior raw oil undergoes the mild catalytic conversion, the obtained catalytic wax oil undergoes aromatic extraction, and the extract oil richly contains double ring arenas and is a quite good chemically raw material; and the raffinate oil richly contains alkanes and naphthenic hydrocarbons, and is quite suitable for catalytic conversion, so that the highly efficient utilization of gasoline resources is realized.

Description

technical field [0001] The invention belongs to the catalytic conversion method of hydrocarbon oil, more specifically, it is a method for converting low-quality raw materials into a large amount of light fuel oil and propylene by combining the catalytic cracking of hydrocarbon oil and the extraction process of aromatic hydrocarbons. Background technique [0002] The quality of crude oil is getting worse with the continuous increase of crude oil extraction, mainly manifested in the increase of crude oil density, viscosity, heavy metal content, sulfur content, nitrogen content, colloid and asphaltene content and acid value. At present, the price difference between low-quality crude oil and high-quality crude oil is also increasing with the shortage of oil resources, resulting in more and more attention to low-priced low-quality crude oil extraction and processing methods, that is, to increase as much as possible from low-quality crude oil. The yield of light oil has brought hu...

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Problems solved by technology

However, the inventor found through creative thinking and repeated experiments that the conversion rate of heavy oil catalytic cracking is not as high as possible. When the conversion rate reaches a certain level, the target product increases little, but the yield of dry gas and coke increases greatly.

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