Abstract: The dewaxing and deoiling processes using different solvent compositions, pre-dilution and cold point dilution were tested to investigate the optimal conditions for processing hydrotreated heavy fractions. Considering the dewaxing temperature difference, filtration rate, and the yield of dewaxing oil and deoiling wax, a filtrate recycling process with two dewaxings and two deoilings was proposed.

Key words: heavy fractions, solvent dewaxing and deoiling, oil content, filtration rate