Mobil Oil Corporation

Fred S Zrinscak, Sr

Klaus W Schatz

Stephen J McGovern

Grant G Karsner

Yuk-Mui Louie

A process for recovering HF catalyst and acid soluble oil from an HF alkylation unit acid stream containing HF and acid soluble oils. The acid stream is charged to a distillation column, wherein free HF acid, and stripping fluid added to the column, are removed as an overhead fraction. A bottoms fraction is removed from this column containing acid soluble oil and some HF. This bottoms fraction is cooled and mixed with a light hydrocarbon, and the mixture is allowed to settle. The mixture separates into an HF-lean acid soluble oil, plus solvent upper phase and an HF-rich acid soluble oil lower phase. The HF-lean phase may be withdrawn from the process as a product or upgraded to improve its quality, permitting recycle of the HF-rich phase with reduced acid soluble oil content, to the alkylation unit.

Solvent extraction and purification of acid soluble oil from an HF

The deleterious effects of contaminant metals present in feeds to a catalytic cracker can be reduced to a greater extent than that obtainable with conventionally practiced passivation techniques utilizing antimony treated catalysts by pretreating the catalyst with hydrogen sulfide.

Process for the reduction of the effect of contaminant metals in

A stripper arrangement is provided in a regenerated catalyst standpipe for removing or displacing combustion flue gas products with fuel gas products of hydrocarbon conversion freed of hydrogen sulfide.

Separating flue gas from regenerated cracking catalyst

Metal-contaminated oils, including mildly hydrotreated residual oils, are catalytically cracked in the absence of added hydrogen in a fluid catalytic cracking process wherein the regenerated catalyst has less than about 0.05 wt. % residual carbon. By conducting regeneration of the catalyst to that level at 1300.degree. to 1400.degree. F. (preferably at about 1350.degree. F.) with excess air, additional benefits are realized in that metal deposited on the catalyst by cracking of residual stocks is thereby passivated.

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Woodbury Heights, NJ, United States of America

Fred S Zrinscak, Sr