Method for preparing light fuel oil and propylene from poor-quality raw oil

Abstract

A method for preparing light fuel oil and propylene from poor-quality raw oil comprises the following steps: the poor-quality raw oil sequentially enters a first reaction zone and a second reaction zone of a catalytic conversion reactor so as to be contacted with a catalytic conversion catalyst to generate first reaction and second reaction respectively, and after gas-solid separation is implemented to reaction products and spent catalyst, the spent catalyst returns to the reactor for recycling after steam stripping and burning; the reaction products are separated to obtain propylene, gasoline, heavy oil and other products, wherein the heavy oil is contacted with hydrogen and a hydrotreating catalyst for reaction, the obtained hydrogenated heavy oil circulates to the first reaction zone of the catalytic conversion reactor or / and other catalytic conversion devices for further reaction to obtain the target products of the propylene and the gasoline. The characteristic of the heavy oil obtained by hydrotreating after the mild catalytic conversion of the poor-quality raw oil is significantly improved, thereby significantly increasing light oil, reducing dry gas, reducing the yield of oil slurry and realizing the high-efficient utilization of petroleum resources.

Description

technical field [0001] The invention belongs to a method for catalytic conversion of hydrocarbon oil, more specifically, a method for converting inferior raw materials into a large amount of light fuel oil and propylene by combining catalytic cracking and hydrotreating processes of hydrocarbon oil. 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 huge challenges to traditional crude ...

AI Technical Summary

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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