Abstract:
The present invention relates to a solid catalyst component for olefin polymerization comprising an α-cyanosuccinate compound as an internal electron donor, a catalyst comprising the catalyst component, and use of the catalyst in olefin polymerization. When used in propylene polymerization, the catalyst exhibits a higher catalytic activity and good hydrogen response, and the resulting polymer has a high isotacticity and a broad molecular weight distribution.
Abstract:
Methods for rejuvenation of supported metallic catalysts comprised of a Group VIII metal, a Group VIB metal, making use of these metals, an organic complexing agent, and optionally an organic additive, are provided. The rejuvenation includes stripping and regeneration of a spent or partially spent catalyst, followed by impregnation with metals and at least one organic compound. The impregnated, regenerated catalysts are dried, calcined, and sulfided. The catalysts are used for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.
Abstract:
Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIII metal having an atomic number of at least 44, preferably palladium; an alkali metal or alkaline earth metal halide, preferably sodium bromide; and at least one aliphatic polyether such as a polyethylene glycol dimethyl ether or a crown ether. The catalyst system also preferably contains a compound of another metal, preferably lead.
Abstract:
Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIII metal having an atomic number of at least 44, preferably palladium; an alkali metal or alkaline earth metal halide, preferably sodium bromide; and at least one aliphatic polyether such as a polyethylene glycol dimethyl ether or a crown ether. The catalyst system also preferably contains a compound of another metal, preferably lead.
Abstract:
The invention pertains to a process for reducing the sulphur content of a hydrocarbon feedstock to a value of less than 200 ppm, preferably less than 50 ppm, which comprises subjecting a catalyst comprising a Group VIB metal component, a Group VIII metal component, and an organic additive on a carrier to a sulphidation step, and contacting a feedstock with a 95% boiling point of 450°C or less and a sulphur content of 500 ppm or less with the sulphided catalyst under conditions of elevated temperature and pressure to form a product with a sulphur content of less than 200 ppm. The organic additive preferably is at least one compound selected from the group of compounds comprising at least two hydroxyl groups and 2-10 carbon atoms, and the (poly)ethers of these compounds.
Abstract:
An aqueous epoxidation process stream containing molybdenum and sodium values is incinerated and an aqueous solution containing molybdenum and sodium is recovered, acidified and reacted with a calcium compound without first adding base to form solid CaMoO4 which is separated.
Abstract:
The present invention relates to MgCl2.mROH.nH2O adducts, where R is a C1-C10 alkyl, 2≤m≤4.2, 0≤n≤0.7, characterized by an X-ray diffraction spectrum in which, in the range of 2υ diffraction angles between 5° and 15°, the three main diffraction lines are present at diffraction angles 2υ of 8.8 ± 0.2°, 9.4 ± 0.2° and 9.8 ± 0.2°, the most intense diffraction lines being the one at 2υ=8.8 ± 0.2°, the intensity of the other two diffraction lines being at least 0.2 times the intensity of the most intense diffraction line. Catalyst components obtained from the adducts of the present invention are capable to give catalysts for the polymerization of olefins characterized by enhanced activity and stereospecificity with respect to the catalysts prepared from the adducts of the prior art.
Abstract:
Die Erfindung betrifft peroxidhaltige Katalysatorzusammensetzung, die 60 bis 80 Gew.-% einer Ketonperoxidkomponente (A), 10 bis 20 Gew.-% einer Ketonesterkomponente (B) und 10 bis 20 Gew.-% einer Inhibitorkomponente (C), enthalten, wobei sich die Summe der Gewichtsprozentanteile der Komponenten (A), (B) und (C) zu 100 Gew.-% ergänzt. Die Erfindung betrifft desweiteren die Verwendung der peroxidhaltigen Katalysatorzusammensetzung als Starter-Peroxidzusammensetzung im Pultrusionsverfahren.
Abstract:
Die Erfindung betrifft peroxidhaltige Katalysatorzusammensetzung, die 60 bis 80 Gew.-% einer Ketonperoxidkomponente (A), 10 bis 20 Gew.-% einer Ketonesterkomponente (B) und 10 bis 20 Gew.-% einer Inhibitorkomponente (C), enthalten, wobei sich die Summe der Gewichtsprozentanteile der Komponenten (A), (B) und (C) zu 100 Gew.-% ergänzt. Die Erfindung betrifft desweiteren die Verwendung der peroxidhaltigen Katalysatorzusammensetzung als Starter-Peroxidzusammensetzung im Pultrusionsverfahren.