Arco Chemical Technology, L.p.

Other

Kevin M Carroll

Yuan-Zhang Han

Edrick Morales

Robert G Gastinger

David Cherosky

A water-proof protective overshoe adapted to be worn over shoes to keep the shoes warm and dry is provided. The water-proof protective overshoe includes a body portion and a sole portion. The body portion may include one or more opening means, such as zippers, and one or more tightening means. The protective overshoes may be quickly put on and removed. The protective overshoe is adapted for use by players on the sidelines of an athletic game or match.

Water-proof protective shoe covering

Used titanium-containing silicon oxide catalysts are regenerated by heating the used catalyst at a temperature of at least 400&#xb0; C. in the presence of a oxygen-containing gas stream, followed by impregnation with a titanium source, and then calcining the impregnated catalyst to form a reactivated catalyst.

Heterogeneous catalyst regeneration

Highly active and selective epoxidation catalysts are prepared by combining highsurface area silica support or the like, having surface area greater than 1100 m /g, with a titanium source. The titanium source is a non-oxygenated hydrocarbon solution of a titanium halide or a vapor stream of titanium tetrachloride. The impregnated support is then calcined at an elevated temperature (preferably, in a substantially oxygen-free atmosphere), and, optionally, reacted with water and/or silylated. The resulting materials are highly active heterogeneous epoxidation catalysts for the reaction of olefins with organic hydroperoxides.

Method for making a heterogeneous epoxidation catalyst

A process for forming an olefin epoxidation catalyst is described. The process comprises reacting a tert-alkyl trihydroxysilane with a titanium complex such that the ratio of Si:Ti is 7. The catalyst is very active and selective in olefin epoxidation.

Homogeneous epoxidation catalyst

Highly active and selective epoxidation catalysts are prepared by combining high surface area silica support or the like, having surface area greater than 1100 m.sup.2 /g, with a titanium source. The titanium source is a non-oxygenated hydrocarbon solution of a titanium halide or a vapor stream of titanium tetrachloride. The impregnated support it then calcined at an elevated temperature (preferably, in a substantially oxygen-free atmosphere), and, optionally, reacted with water and/or silylated. The resulting materials are highly active heterogeneous epoxidation catalysts for the reaction of olefins to with organic hydroperoxides.

Heterogeneous epoxidation catalyst

Highly active and selective epoxidation catalysts are prepared by combining silica or the like with a non-oxygenated hydrocarbon solution of titanium halide, removing solvent, calcining at an elevated temperature (preferably, in a substantially oxygen-free atmosphere), and, optionally, reacting with water and silylating. The resulting materials are useful heterogeneous catalysts for transforming olefins to epoxides using organic hydroperoxides.

Epoxidation process using improved heterogeneous catalyst composition

A titanium/silica epoxidation catalyst is prepared from silica which has been treated with strong aqueous acid solution, the catalyst is especially useful for propylene oxide production.

Epoxidation catalyst and process

The catalytic activity of a titanium-containing heterogeneous catalyst such as titania-on-silica which has been used to catalyze olefin epoxidation is effectively restored by washing the catalyst with water, alcohol, ether, nitrile, ester, aromatic hydrocarbon, or ketone.

The activity of titanium-containing heterogeneous catalysts such as titania-on-silica which have been used to catalyze olefin epoxidation is effectively restored by heating in the presence of oxygen at a temperature of 700.degree. C. or greater. Epoxide selectivity is enhanced by treatment of the heated catalyst with a silylating agent, even where the used catalyst had been silylated when initially prepared.

A heterogeneous catalyst suitable for use in an olefin epoxidation reaction is obtained using a titanosiloxane polymer as a source of titanium. The titanosiloxane is combined with an inorganic siliceous solid such as silica or a siliceous sol gel to form a catalyst precursor composition. Calcination yields the active titanium-containing catalyst.

Preparation of titanium-containing catalysts using titanosiloxane

Apparatus as an aid while performing bent knee sit-ups, comprising, in combination a strap of material adapted to extend and be positioned over the ankles of a person doing bent knee sit-ups, when in a deployed orientation, but adapted to be rolled up when in a storage orientation; a pair of assemblies, each assembly having a hollow base in a rectangular configuration with a slot within the upper surface for the passage of one end of the strap, each base having a circular hole for the passage of a fixed plug, each base having a cylindrical tube rotatively secured around the plug with a spring secured at one end of the plug and secured at the other end to the interior of the tube, and with one end of the strap secured to the exterior surface of the tube wherein the ends of the strap may be coiled about the tube when the spring is released and the assemblies in close proximity to each other when in a storage orientation, but wherein the assemblies may be spread apart to extend the strap to the deployed orientation with the springs in a tension state; and securement means adapted to secure the assemblies to a surface.

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Havertown, PA, United States of America

Kevin M Carroll