Stauffer Chemical Company

Occidental Petroleum

Paul Y Chen

Ajay M Madgavkar

Thaddeus J Kaniecki

Henry H Feng

Pattamadai E Narasimhan

Barry A Friedfeld

Chester G Buffington

Waheed Mukaddam

John W Kennedy

Chong-tan Liu

Herbert H Fang

Morton Sternberg

There is provided a process for reduction of the nitrogen content of shale oil. The process comprises contacting shale oil with a low acid strength solvent in a first extraction zone, followed by contacting the shale oil with a high acid strength solvent in a second extraction zone. A portion of the high acid strength solvent containing extracted nitrogen-containing and non-nitrogen-containing compounds is passed to the first extraction zone and diluted to form low acid strength solvent, and at least a portion of the non-nitrogen-containing compounds redissolve into the shale oil in contact with the low acid strength solvent and are recovered. Thus, oil recovery is maximized at high nitrogen removal.

Process for removing nitrogen from shale oil

An environmentally acceptable method for cleaning the interior of vessels comprises contacting the interior of a vessel with a solvent for the contaminant contained therein to produce a contaminated solvent, collecting the contaminated solvent from the vessel, separating essentially all of the contaminant from the contaminated solvent to recover essentially all of the solvent essentially free of the contaminant and produce a contaminant composition which is incineratable or can be made incineratable by blending with a combustible composition, such as fuel oil. The contaminant may be separated from the contaminated solvent by distillation; in which case the overhead product may be washed with sulfuric acid and then neutralized with a base.

Process for cleaning the interiors of vessels

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Huntington Beach, CA, United States of America

Paul Y Chen