Combined process of hydrotreating and catalytic cracking for inferior oil products

Abstract

The invention discloses a combined process of hydrotreating and catalytic cracking for inferior oil products. The process comprises the following contents: raw oil and a hydrogen gas are mixed, the mixed material enters a hydrotreating reaction zone, and the obtained effluent of a hydrogenation reaction is subjected to gas-liquid separation, so that hot low-separation oil and cold low-separation oil are obtained; the obtained hot low-separation oil and cold low-separation oil are directly enter a fractionation tower through different material inlets for separation, so that a light catalytic cracking raw material and a heavy catalytic cracking raw material are obtained; a part of the obtained heavy catalytic cracking raw material and a hydrogen gas are mixed, the mixed material enters a hydrogenation residual-carbon removing reaction zone, the reaction product enters a separation unit, and the reaction product and the reaction effluent of the hydrotreating reaction zone are subjected toseparation; and the obtained light catalytic cracking raw material and the rest of the heavy catalytic cracking raw material individually enter a catalytic cracking device or enter the catalytic cracking device after mixing for a catalytic cracking reaction, and the reaction product enters a catalytic cracking product separation system. The combined process provided by the invention can produce amaximum amount of high-value-added products, and can greatly reduce the overall energy consumption of a hydrogenation device.

Description

technical field [0001] The invention relates to a method for lightening low-quality oil products, specifically a process for producing light fuel oil products by organically combining hydrogenation treatment and catalytic cracking processes with low-quality oil products as raw materials. Background technique [0002] As crude oil becomes heavier and worse, more and more residual oil needs to be processed. Residual oil generally refers to crude oil or hydrocarbon materials from other sources. After vacuum distillation, gasoline fraction, diesel fraction, and vacuum distillate oil are removed. The remaining part after waiting for the fraction generally has the characteristics of high boiling point and high impurity content, and is the most difficult raw material to process in the oil refining industry. The processing of residual oil is not only to crack it into products with low boiling point, such as naphtha, middle distillate oil and vacuum gas oil, etc., but also to increas...

AI Technical Summary

Problems solved by technology

However, the diesel fraction is obtained through high-pressure hydrogenation, and its residual sulfides are mainly 4,6-dimethyldibenzothiophene sulfur-containing compounds, which are very difficult to remove

In addition, the diesel fraction usually has a low paraffin content, and even after deep hydrotreating, the increase in cetane number is very limited, and it still cannot meet the quality index requirements of high-quality automotive diesel products.

Therefore, the current process for treating residual oil cannot produce products with satisfactory performance, and it is urgent to improve the existing process

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