Improvement in procedure for propane and propane-butane deasphalting of petroleum resids

Several alternate schemes for reconstruction of the solvent regeneration unit at installations for the propane and propane-butane deasphalting of hydrones, are proposed. Conversion of high pressure solvent regeneration unit to supercritical operating regime procedure is one alternative, during which the deasphaltizate solution, which can be tapped from the extraction tower using a booster pump, is brought to the supercritical pressure, and then heated to the supercritical temperature in heat exchangers, after which it is delivered to a separator. Use of injector system for compression of flows of gaseous solvent at 1-hydrone-deasphalting installations is another alternate rebuilding scheme for the solvent-regeneration unit that opens broad possibilities for improvement of the deasphalting of petroleum resid. This complex rebuilding encompasses both the high- and low-pressure solvent-regeneration system. Technico-economic analyses of the effectiveness of this rebuilding of the propane-deasphalting installation by the NOVOIL Co. indicate that expenditures for energy resources are reduced by more than three times as a result of the replacement of water vapor.