MILD CRACKING SOLVENT DEASPHALTING - A NEW METHOD FOR UPGRADING PETROLEUM RESIDUE

A new process-mild cracking solvent deasphalting (MCSD)-is described f or upgrading heavy oil. Continuous bench experiments were carried out on Shengli and Gudao vacuum residues. The effects of cracking temperat ure and time on the yield, Conradson carbon residue, nickel content of deasphalted oil and properties of raffinate asphalt were examined. Th e deasphalted oil (DAO) obtained by MCSD was superior in yield and qua lity to that from solvent deasphalting alone. At the same yield of DAO , the softening point of the raffinate asphalt was lower and the penet ration and the ductility were greater than those for the solvent deasp halting process.