Co-processing of MWP

A more interesting approach for co-processing is the conventional treatment of plastic with a heavy petroleum fraction blend in a refinery unit. The main advantage of this coprocessing method is that it utilizes existing processes within a refinery complex, resulting in reduced capital costs. Little research has focused on the co-processing of plastics with a feedstock of a refinery unit. Studies have been carried out with different plastics and refinery feeds. 

The principal limitation to co-processing is the need for important refining liquid streams which are necessary taking into account the limited amount of plastics that can be mixed, and the restricted use of chlorine and other hetereoatoms contained in the plastics that can negatively affect the refinery unit and catalyst. 

In the case of waste polymer mixture, it is expected that impurities in the waste plastic mixture, as well as polymer type, have an effect on the hydrocracking process. In addition, the degradation of single polymers might be different from that of mixtures of polymers. 

Both the temperature and the type of catalyst effected the product distribution. Different trends in product distribution were observed with the catalyst as the reaction temperature increased. As expected, HZSM-5 showed a high cracking activity, leading to more gas product formation. There was a continuous increase in gas yield by increasing temperature whereas liquid yield decreased dramatically. In contrast to the liquid yield, the amount of wax did not decrease at temperatures above 435°C. This shows that at higher 

On the other hand, in radical degradations the concentration of free radicals can be controlled by H2S [45], In this study, H2S is already present because the HVGO contains 

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