Abstract: A gas stream containing CO.sub.2 and H.sub.2 S is contacted with an alkanolamine in a contacting zone. The rich solution is then selectively stripped in a stripping zone to produce a gas stream containing a higher CO.sub.2 :H.sub.2 S mole ratio than the initial stream. This stream can be recycled to the alkanolamine contacting zone. The partially stripped solution can be introduced into another stripping zone to provide a third gas stream which is rich in H.sub.2 S and lean in CO.sub.2 suitable as feed for a Claus Unit and a lean alkanolamine solution which can be recycled to the contacting zone.

Abstract: A gas stream containing CO.sub.2 and H.sub.2 S is contacted with an alkanolamine in a contacting zone. The rich solution is then selectively stripped in a stripping zone to produce a gas stream containing a higher CO.sub.2 :H.sub.2 S mole ratio than the initial stream. This stream can be recycled to the alkanolamine contacting zone. The partially stripped solution can be introduced into another stripping zone to provide a third gas stream which is rich in H.sub.2 S and lean in CO.sub.2 suitable as feed for a Claus Unit and a lean alkanolamine solution which can be recycled to the contacting zone.

Abstract: A process for recovering oil from oil wet and particularly from oil-wet, acidic tar sands is described in which these sands are subjected to vigorous fluidization in the presence of water, air and a surfactant but in the absence of an extraneous hydrocarbon solvent. This step produces a multiphase mixture including an oil containing froth enabling gravity separation, e.g. in hydrocyclone.

Abstract: Demetallized hydrocarbon feedstock is obtained from heavy oils by first solvent extracting the heavy oils and then demetallizing the extract in a magneto-filtration step. In another embodiment, diamagnetic nickel complexes in hydrocarbon oils are first converted to a paramagnetic product and the oil stream thereafter is passed through a magneto-filtration operation.