Method for extracting FCC oil slurry aromatic hydrocarbons

Abstract

The present invention relates to a method for extracting FCC oil slurry aromatic hydrocarbons. The method comprises that: 90% by mass of furfural and 10% by mass of dimethyl sulfoxide are adopted as a continuous phase in a pulse filler extraction tower, a FCC oil slurry is adopted as a disperse phase, and extraction separation is performed at a temperature of 60 DEG C according to a catalyst/oil mass ratio of 2:1-3:1, wherein the extracted phase is obtained from the bottom of the tower, and the raffinate phase is obtained from the top of the tower; and the extracted phase and the raffinate phase respectively enter a pressure reduced rectification tower, solvent recovery is performed under a pressure of 26.66 KPa at a tower bottom temperature of 121.8 DEG C according to a reflux body mass ratio of 1:1, and the recovered two solvents return to the inlet of the extraction tower so as to be recycled. According to the present invention, the aromatic hydrocarbon content in the extracted oil (gum and asphaltene are removed) obtained after extraction is more than 90%, the saturated hydrocarbon content of the raffinate oil is less than 10%, and the characteristic indexes of the oil product of the present invention are superior to the characteristic indexes of the oil product extracted with pure furfural; and the method has characteristics of simple process, simple equipment, simple operation, mild process conditions, low power consumption, wide application rang and easy large-scale industrial production.

Description

technical field [0001] The invention relates to a method for extracting aromatics from catalytic oil slurry. Background technique [0002] At present, domestic catalytic oil slurry is generally shipped as cheap heavy fuel oil. Since such products are non-standard products, and without further processing, they are only sold as crude raw materials. One is that the economic benefits of sales are low, and the other is that most of them are flooded in the market as low-grade products, which has a negative impact on the sales of regular standard petroleum products. In recent years, a lot of research has been done on the properties of catalytic oil slurry and its rational utilization technology, mainly involving the combination of catalytic oil slurry and refining process to rationally use catalytic oil slurry, or the production of chemical products according to the composition characteristics of catalytic oil slurry Utilization technology research, in order to obtain high value-...

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Problems solved by technology

[0005] However, the current solvent refining process often uses a single solvent for extraction. Experiments have proved that the aromatic content of the extracted oil obtained after single-solvent extraction can reach 80%, while the aromatic content of the extracted oil obtained by using compound solvent extraction can be as high as 90%. Therefore, single-solvent The extraction effect is not as good as that of the compound solvent, and the compound solvent is more suitable for the refining of heavy oil