A kind of heavy hydrocarbon raw material hydrotreating method

Abstract

The invention discloses a heavy hydrocarbon material hydrotreating method. The method comprises: connecting an up-flow reactor with at least one down-flow fixed-bed reactor in series, passing a heavy hydrocarbon material through the UFR (up-flow reactor) and the down-flow fixed-bed reactor, subjecting the reaction effluent to separation and fractionation so as to obtaining hydrogenation tail oil, and conducting catalytic cracking; disposing a preposed reactor, hydrogenating catalytic cracking recycle oil and / or oil slurry, mixing at least part of the obtained reaction effluent with the UFR reaction effluent, and leaving the mixture to enter the down-flow fixed-bed reactor. By means of coordination of the UFR, the down-flow fixed-bed reactor and the preposed reactor, the method provided in the invention solves the problems of unmatched operation cycle and reaction temperature when the UFR and the down-flow fixed-bed reactor are combined, so that the temperature distribution of the down-flow fixed-bed reactor can be more reasonable, performance of the catalyst in the down-flow fixed-bed reactor can be brought into play, the catalyst utilization rate is improved, and the equipment economic benefits are significantly enhanced.

Description

technical field [0001] The invention relates to a hydrocarbon raw material hydrogenation treatment technology, in particular to a heavy hydrocarbon raw material hydrogenation treatment process including atmospheric residue oil and vacuum residue oil. Background technique [0002] With the development of the economy, the demand for light oil is increasing day by day, but the demand for heavy fuel oil is gradually decreasing. At the same time, the trend of crude oil becoming heavier and worse is becoming more and more obvious. One of the main goals pursued. [0003] Among the various processes for lightening residual oil, it is a better process to firstly carry out hydrogenation treatment on the residual oil, and then carry out catalytic cracking processing on the hydrogenated tail oil. Residual oil is hydrotreated to remove impurities such as metals, sulfur, and nitrogen, and the hydrogen content is increased. It can be used as a high-quality heavy oil catalytic cracking raw...

AI Technical Summary

Problems solved by technology

Especially for UFR, the above-mentioned problems are more prominent, often causing abnormal premature shutdown of the entire residual oil hydrogenation unit

[0008] In the actual operation process, the existing combined process of UFR and downflow fixed bed reactor has the problem that the operation cycle and reaction temperature of UFR and downflow fixed bed reactor do not match. Usually, UFR will appear hot spots in the middle and late stages of operation. , resulting in the UFR not being able to raise the temperature easily, and the inlet of the downflow fixed bed reactor has no effective temperature raising means, so that the reaction activity of the downflow fixed bed cannot be fully exerted, which is not conducive to prolonging the operation cycle

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