Abstract:
Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric equivalent of aqueous base such as sodium hydroxide to form Na.sub.2 MoO.sub.4 and the resulting mixture is phase separated to separate an organic phase reduced in molybdenum and a net aqueous stream containing removed molybdenum, the mass ratio of the organic phase to the net aqueous stream being 450-3,000/I.
Abstract:
The invention concerns a catalytic composition resulting from placing at least one divalent nickel compound into contact with at least one hydrocarbylaluminum halide and at least one epoxy compound, in any order. It also concerns the use of the catalytic composition in a process of oligomerizing monoolefins.
Abstract:
An improved process for the production of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon employs a novel catalyst composition formed from a compound of palladium, an anion of a strong non-hydrohalogenic acid and a supported bidentate ligand of phosphorus. The improved process is characterized by a reduced level of reactor fouling. The polymer products are useful as engineering thermoplastics.
Abstract:
Disclosed is a process for recovering rhodium catalyst values from "tars" formed during the preparation of acetic anhydride by the rhodium catalyzed carbonylation of a mixture of methyl iodide and methyl acetate and/or dimethyl ether. The disclosed process provides a means for the recovery of rhodium values which normally are not extracted from the tars by treating a methyl iodide solution of such tars with certain oxidants.
Abstract:
In one aspect, the present disclosure encompasses polymerization systems for the copolymerization of CO2 and epoxides comprising 1) a catalyst including a metal coordination compound having a permanent ligand set and at least one ligand that is a polymerization initiator, and 2) a chain transfer agent having one or more sites capable of initiating copolymerization of epoxides and CO2, wherein the chain transfer agent contains one or more masked hydroxyl groups. In a second aspect, the present disclosure encompasses methods for the synthesis of polycarbonate polyols using the inventive polymerization systems. In a third aspect, the present disclosure encompasses polycarbonate polyol compositions characterized in that the polymer chains have a high percentage of -OH end groups, a high percentage of carbonate linkages, and substantially all polycarbonate chains having hydroxyl end groups have no embedded chain transfer agent.
Abstract:
On décrit un procédé d'hydrodésulfuration d'une coupe essence contenant des hydrocarbures ayant au moins 2 atomes de carbone par molécule et ayant un point d'ébullition final inférieur ou égal à 250 °C, consistant en la mise en contact de ladite coupe essence avec au moins un catalyseur dont la phase active comprend au moins un métal du groupe VIII et au moins un métal du groupe VIB déposés sur un support, ledit catalyseur étant préparé selon un procédé comprenant au moins : i) une étape de mise en contact d'au moins dudit support avec au moins une solution contenant au moins un précurseur d'au moins dudit métal du groupe VIII et au moins un précurseur d'au moins dudit métal du groupe VIB; ii) une étape de mise en contact d'au moins dudit support avec au moins un composé organique formé d'au moins un oligosaccharide cyclique composé d'au moins 6 sous-unités glucopyranose liées en α-(1,4); iii) une étape de séchage pour obtenir au moins ledit métal du groupe VIII et au moins ledit métal du groupe VIB sous forme oxyde; puis iv) une étape de sulfuration de sorte que ladite phase active se présente sous forme sulfure, les étapes i) et ii) pouvant être réalisées séparément, dans un ordre indifférent, ou simultanément.
Abstract:
The present disclosure provides a Ziegler-Natta catalyst composition comprising a procatalyst, a cocatalyst and a mixed external electron donor comprising a first selectivity control agent, a second selectivity control agent and an activity limiting agent. A polymerization process incorporating the present catalyst composition produces a high-stiffness propylene-based polymer with a melt flow rate greater than about 50 g/ 10 min. The polymerization process occurs in a single reactor, utilizing standard hydrogen concentration with no visbreaking.
Abstract:
Prepolymerized catalyst component for the polymerization of olefins CH 2 =CHR in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, having average particle size equal to or lower than 30 μm comprising a solid catalyst component comprising magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being selected from 1,3-diethers and the other one being selected from esters of aromatic mono or dicarboxylic acids, said solid catalyst component being prepolymerized with an olefin, having from 2 to 10 carbon atoms, to such an extent that the amount of the olefin prepolymer is equal to or lower than 5Og per g of solid catalyst component.