Pilot plant evaluation of Unconverted Oil quality to reach Group II & Group III base oil | Source: Nilesh Chandak et al. 

In a refinery, Unconverted Oil (UCO), is the part of the feedstock, usually heavy hydrocarbons, that does not undergo the desired conversion into lighter products like gasoline or diesel during processes like hydrocracking and remains as a heavier hydrocarbon fraction. The term UCO is most commonly associated with hydrocracking units, where vacuum gas oil (VGO) or heavier fractions are processed. However, it can also appear in other conversion processes, though less frequently.

#uco  #unconvertedoil  #hydrocracking