Catalytic cracking performance of aromatics in coker gas oil and retardation effect on saturates

Key words:  coker gas oil  aromatics  catalytic cracking  retardation effect

Abstract:

Aromatics were separated from coker gas oil (CGO) using the furfural extraction. The catalytic cracking performance of aromatics and the retardation effect on saturates were investigated. The results show that the furfural has good extraction effect on aromatic hydrocarbons from CGO, which weakens the competitive adsorption and retardation effect of polycyclic aromatics on the saturated hydrocarbons. As a result, the raffinate oil has 15.3% higher conversion than CGO, while the extracted oil has 16.1% lower conversion than CGO. Increasing the ratio of catalyst to oil can significantly enhance the conversion of extracted oil and yields of desired products. And the effect of mass space velocity is less. The influence of reaction temperature is the least compared to the above two factors. The extracted oil is not only difficult to catalytic cracking, but also hinders the effective catalytic cracking of saturates, which results in the declined feedstock conversion and reduces desired products yield. Consequently, the polycyclic/fused aromatics are one of the key factors restricting the effective catalytic cracking of CGO.