Catalytic conversion method for hydrocarbon oil raw material

Abstract

The invention discloses a catalytic conversion method for a hydrocarbon oil raw material. The hydrocarbon oil raw material contacts the catalytic cracking catalyst in a catalytic cracking reactor, the reaction oil gas and a spent catalyst are separated, then the spent catalyst is made steam stripping and regeneration and then returns to the catalytic cracking reactor for repeated use, the reaction oil gas is fractionated to obtain dry gas, liquefied gas, gasoline, light circulating oil, heavy circulating oil and heavy oil; the light circulating oil and any diesel fraction are cut into the light fraction of the light circulating oil and the heavy fraction of the light circulating oil; the heavy fraction of the light circulating oil is mixed with the heavy circulating oil and contacts the hydrogen and the hydrorefining catalyst, the reaction effluent is separated to obtain gas, naphtha and hydrogenated diesel, the hydrogen is reclaimed and then is circularly used; the light fraction of the light circulating oil independently or the light fraction of the light circulating oil along with the hydrogenated diesel returns to the catalytic cracking reactor. The method converts the catalytic cracking circulating oil into the gasoline with low olefin content and high octane value, and improves the yield of the gasoline and the yield of the propylene.

Description

technical field The present invention belongs to a process combining a catalytic cracking process of hydrocarbon oil in the absence of hydrogen and a hydrotreating process. Background technique The world's demand for oil is increasing, and the quality of crude oil is becoming increasingly heavy and inferior. The processing of inferior raw materials by catalytic cracking units is an inevitable problem. The proportion of residual oil in the raw materials processed by the catalytic device is also increasing, the sulfur and nitrogen content of the raw materials increase, and the product quality declines. Large and low cetane number, it needs to be modified and blended with straight-run diesel to be used as commercial diesel. At present, domestic and foreign diesel oil upgrading mostly adopts hydrofining or selective aromatics extraction, but the cost of single selective hydrofining is high; selective aromatics extraction affects the yield of upgraded diesel oil, and the modifie...

AI Technical Summary

Problems solved by technology

CN1746265A discloses a catalytic cracking processing technology. The light diesel oil fraction obtained by the process is returned to the catalytic cracking unit for re-refining, the obtained heavy diesel oil fraction is subjected to solvent extraction, and the extracted heavy aromatics are used as products, and the raffinate oil is returned to the catalytic cracking unit. Refining, but this method has the problems of low gasoline yield and high gasoline olefin content

How to use catalytic cracking cycle oil to produce gasoline products with low olefin content and high octane number is a problem that puzzles those of ordinary skill in the art, and the above-mentioned prior art does not solve this problem

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