What type of refining process is used to improve the quality of naphthas?

Reforming is the correct process used to improve the quality of naphthas in petroleum refining. This process involves converting low-octane naphthas into high-octane products, which are more desirable for blending into gasoline. Reforming enhances the molecular structure of the hydrocarbons, thereby increasing their sensitivity and overall performance.

The process typically involves catalytic reforming, where the naphtha feed is subjected to heat and pressure in the presence of a catalyst, facilitating complex chemical reactions. As a result, naphthas can be transformed into aromatics and other high-value components which not only boost octane ratings but also improve the overall yield of gasoline.

Other processes, such as distillation, are primarily used for separating components based on boiling points. Treating refers to the removal of impurities, while separation also focuses on dividing mixtures into their constituent parts, but these processes do not specifically aim to enhance the quality of naphthas through molecular reconfiguration like reforming does.