Abstract:
A process for improving the catalytic activity of a partially deactivated solubilized rhodium - tertiary organophosphine complex hydroformylation catalyst by treating it with propargyl alcohol and a carboxylic acid.
Abstract:
Disclosed is a method of preparing a catalyst for hydrogenation of a hydrocarbon oil, in which a hydroxycarboxylic acid is added to a catalyst carrying a metal of the Group VI of the Periodic Table and a metal of the Group VIII of the same, optionally along with phosphoric acid, on a carrier, in an amount of from 0.3 to 5 molar times of the total metal molar number of the metal of the Group VI and the metal of Group VIII, and thereafter the resulting catalyst is dried at a temperature not higher than 200°C. The catalyst has a high catalyst activity and is used for hydrogenation of a hydrocarbon oil, especially satisfying the requirement of reducing the sulfur content in a light oil.
Abstract:
Molybdenum can be removed from substantially anhydrous organic solution thereof by mixing the organic solution and an aqueous solution containing from 1 to 10 wt.% of dissolved sodium metaborate, the amount of aqueous solution being from 1 to 10 wt.%, based on the weight of organic solution, and being sufficient to provide a molar excess of sodium metaborate. The mixture is maintained at a temperature from ambient to 100°C at a pressure of 0.1 to 7.0 MPa (0 to 1,000 psig) for 0.5 to 5 hours, thereby precipitating at least 95 mol% of the soluble molybdenum from the mixture, and providing a filtrate containing less than 100 ppm of molybdenum.
Abstract:
A process for hydroxylating olefins, such as ethylene or propylene, using an oxidant selected from organic hydroperoxides, H 2 0 2 , and oxygen and a catalyst composition comprising at least one osmium carbonyl catalyst, such as Os 3 (CO) 12 , and optionally at least one co-catalyst such as Nal, is disclosed.
Abstract translation:使用选自有机氢过氧化物,H 2 O 2和氧气的氧化剂和包含至少一种羰基锇催化剂如Os 3(CO)12的催化剂组合物和任选的至少一种助催化剂的催化剂组合物来使烯烃如乙烯或丙烯进行羟基化的方法 例如NaI,被公开。
Abstract:
Beim Verfahren zur Rückgewinnung von Edelmetallen der Gruppe VIII des Periodensystems der Elemente aus der bei der Carbonylierung von Methylacetat und/oder Dimethylether anfallenden verunreinigten Katalysatorlösung, welche Carbonylkomplexe dieser Edelmetalle, organische Verbindungen der Stickstoffgruppe und/oder Salze der Alkalimetalle, Erdalkalimetalle, des Chroms, Eisens, Cobalts oder Nickels als Promotoren, undestillierbare organische Verunreinigungen sowie Essigsäure, Essigsäureanhydrid und Ethylidendiacetat enthält, wobei man die flüchtigen Bestandteile aus der Katalysatorlösung abdestilliert und den verbleibenden Destillationsrückstand mit Wasser behandelt, wobei der Edelmetall-Carbonyl- Komplex zusammen mit den organischen Verunreinigungen ausgefällt und von der wäßrigen Phase abgetrennt wird, während der Promotor in Lösung geht und in bekannter Weise zurückgewonnen wird, setzt man aus dem abgetrennten, mit organischen Polymeren verunreinigten Edelmetall-Carbonyl- Komplex durch Behandeln mit Ethylenglykoldialkylethern der Formel R(-OCH 2 -CH 2 ) n -OR, wobei n = 1-4 und R gleiche oder verschiedene Alkylreste mit 1-6 C-Atomen bedeutet, bei Temperaturen von 150° bis 300°C die Edelmetalle in elementarer Form frei und gewinnt sie durch Filtration, während die organischen Verunreinigungen im Lösemittel verbleiben und nach Abdestillieren und Rückgewinnung des Lösemittels entfernt werden.
Abstract:
In the process of recovering molybdenum from a spent catalyst solution which is obtained from a molybdenum catalyzed epoxidation of an olefin with an organic hydroperoxide by removing from the crude epoxidation reaction mixture product epoxide and the alcohol corresponding to the hydroperoxide, said process comprises removing and recovering dissolved molybdenum as a molybdenum containing solid by mixing the spent catalyst solution with water in an amount sufficient to produce a two phase system comprising an organic phase and an aqueous phase, heating the resulting aqueous phase which is rich in molybdenum values to precipitate a molybdenum-containing solid and separating the solid.
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.