Abstract: An apparatus and process for the solvent deasphalting of petroleum stocks. An asphaltene containing feedstock enters an intermediate point of a vertical trayed column and passes downward countercurrent to a rising solvent stream. The resulting extract stream rises through more trays and then through two adjacent U-tube heat exchange bundles stabbed into the column from opposite sides. Asphaltene containing substances are precipitated by this heating. The extract is then admixed by a horizontal shroud and a pair of horizontal baffles above the heat exchangers and retained in a quiescent settling zone before being removed from the column.

Abstract: A sieve-type fractionation tray which has been adjusted for operation at a reduced vapor flow rate. Adjustment is achieved by placing an imperforate plate across the vapor passageways in a manner which selectively seals the passageways located nearest the outlet downcomer. Also a sieve-type fractionation tray having vapor passageways only on the liquid receiving lateral half of the tray.

Abstract: Maximum removal of asphaltic material, including high molecular weight metallic contaminants, from a hydrocarbonaceous charge stock is achieved through the utilization of a solvent extraction zone provided with direct heating facilities in an upper portion thereof.

Abstract: Maximum removal of asphaltic material, including high molecular weight metallic contaminants, from a hydrocarbonaceous charge stock is achieved through the utilization of a solvent extraction zone provided with direct heating facilities in an upper portion thereof. A portion of the solvent-rich hydrocarbon phase is withdrawn from the extraction zone, increased in temperature and introduced into an asphalt settling zone. The separated solvent/hydrocarbon stream, substantially asphalt-free, is reintroduced into the extraction zone at the higher temperature.