Abstract
This paper describes the hydrocracker pilot plant operations to produce Un-Converted Oil (UCO) selective for Base Oil production while achieving the middle distillate quality. This test was carried out to optimize feed and product quality for the commercial Base Oil unit to produce high viscosity index (VI) lube oil. The main objective of this experiment was to assess the performance of the hydro-cracking (HC) catalyst at different conversion levels between 50 wt% and 70 wt% and evaluate the quality of the Base Oil (BO) that would be produced in the commercial unit. For the test, fixed bed reactor was packed with commercial HC catalyst with pre-treatment hydro-treating (HT) catalyst upstream. The process parameters and product yields were studied by varying the HC reactor temperature. Then, hydrocracker products i.e. total liquid product (TLP) were collected and distilled into distillates and UCO. Special emphasis was given to the UCO quality with respect to the conversion so that it can produce desired Base Oil grades of Group-II (Gr II) and Group-III (Gr III). The experimental results have shown that it is possible to produce the Base Oil on specifications even at lower conversion up to 50 wt%. Details of hydrocracker pilot plant design, catalyst, operations and study results are discussed.
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