Abstract: Catalytic dewaxing of a waxy component-containing hydrocarbon feed is accomplished with improved selectivity employing, as catalyst, a zeolite the surface acid catalytic activity of which has been at least partially reduced by chemisorption of a surface-deactivating agent such as a bulky amine thereon. The invention is especially useful for the hydrodewaxing of a waxy lube range product to provide a high viscosity index, low pour point, low cloud point lubricating oil product.

Abstract: A waxy component-containing lubricating oil stock derived from the multi-stage catalytic oligomerization of a lower olefin such as propylene is subjected to selective catalytic hydrodewaxing in the presence of certain acidic zeolites, e.g., H-ZSM-23 and H-ZSM-35, preferably associated with a hydrogenation component such as platinum, palladium or zinc, to provide a high viscosity, low pour point lubricating oil product.

Abstract: There is disclosed a process and an apparatus for beneficiating a mineral ore, such as phosphate-containing ore, in a substantially vertical column. The feed subjected to the benefication preferably has a particle size of less than 20 mesh. The feed is introduced into the column, containing at least one baffle, into which there is also introduced a gas at the bottom portion thereof and a liquid through at least one column inlet at the top of the column. The baffle and the rates of introduction of the feed, the gas, and the liquid are such as to create relatively high turbulence conditions within the column. The enriched, beneficiated product is removed at the top of the column, while the waste products, such as silica-containing material, in the case of a phosphate ore, are recovered at the bottom of the column.

Abstract: In conventional froth floatation procedures for phosphate flotation, the feed is conditioned, diluted and floated. By lowering the pH with acid after the conditioning step, but before flotation, to a pH of from about 6.4 to about 7.0, one can improve phosphate selectivity.