Abstract:
The invention disclosed relates to a process for refining a hydrocarbon feed to make substantially styrene-free C6-C8 aromatic hydrocarbons (BTX). The hydrocarbon feed, for example, unhydrotreated pyrolysis gasoline, is distilled to make a BTX rich stream containing styrene which is fractionated to separate C6 and C7 hydrocarbons from C8 hydrocarbons including styrene. Styrene in the C8 hydrocarbons reacts in the presence of a selective etherification catalyst with a C1-C3 lower alkyl alcohol to form the corresponding styrene ether, which is then separated by distillation into a styrene ether stream and a C8 hydrocarbons rich stream. The C8 hydrocarbons rich stream is then re-mixed with the C6 and C7 hydrocarbons, and sent to hydrogenation reactors to remove sulphur and olefinic hydrocarbons to form substantially styrene-free BTX.
Abstract:
The invention relates to a method or process for the chemical manufacture of depsipeptides of the formula I employing an aldehyde acetal intermediate Formula (I), wherein the symbols have the meaning defined in the description, to new intermediates and their manufacture, as well as related invention embodiments.
Abstract:
According to some aspects, the present disclosure pertains to methods of forming dimethyl 5- tert -butylisophthalate which comprise comprising converting 5- tert -butylisophthalic acid into dimethyl 5 -tert -butylisophthalate in synthesis procedures that comprises methanol and a dehydrating agent as chemical reagents. In other aspects, the present disclosure pertains to methods of forming 5- tert -butyl-1,3- bis (1-methoxy-l-methylethyl) benzene that comprise deprotonating 5- tert -butyl-1,3- bis (1-hydroxy-l-methylethyl)benzene with a Brønsted-Lowry superbase and methylating the deprotonated 5- tert -butyl-1,3- bis (1-hydroxy-l-methylethyl)benzene to form the 5- tert -butyl-1,3- bis (1-methoxy-l-methylethyl)benzene.
Abstract:
Die vorliegende Erfindung stellt neuartige synthetische Tetraether und ein neues Herstellungsverfahren für diese Substanzen zur Verfügung. Die erfindungsgemässen Tetraether zeichnen sich dadurch aus, dass sie durch das vorgestellte Syntheseverfahren einfach und gezielt modifiziert werden können, was die Synthese von gewünschten Modellsubstanzen ermöglicht. Das Synthesekonzept sichert dabei eine hohe Variabilität bei gleichzeitiger Einfachheit der Herstellung.
Abstract:
Ionic liquids were rapidly and efficiently prepared by microwave-assisted chemical transformations. A method for performing microwave-assisted reactions, including alkylation reactions, using ionic liquids as solvent resulted in high yields with dramatically reduced reaction times. Ionic liquids, when used as an additive or co-solvent, allowed for heating, by microwave-assistance, of chemical reactions performed in traditional organic solvents, most notably non-polar solvents.
Abstract:
The present invention relates to a process for producing a hollow MFI zeolite comprising the following steps: a) contacting a MFI zeolite, a structure directing agent and an aqueous phase to form a composition; b) reacting the composition at a first temperature T1 for a first period of time t1 to form a first reacted composition; c) reacting the first reacted composition at a second temperature T2 for a second period of time t2 to form a second reacted composition; and d) calcining the second reacted composition to form a hollow MFI zeolite. The first temperature T1 and the second temperature T2 are separated by at least 10 °C. The invention also relates to a zeolite produced by the process and a use of such a zeolite.
Abstract:
Neue einseitig geschützte 2,2'-Dihydroxybiaryle der Formel (I), (IIa) und (IIb), wobei R1-R4, R1 -R10', X1, X2 und X2' wie in Anspruch 1 definiert sind, und elektrochemisches Verfahren zur deren Herstellung.
Abstract:
Disclosed is a method for the transition metal-mediated oxidation of C-H bonds to form C-0 or C-S bonds. The methods are useful for the formation of ethers (R-OR') from alcohols, R'OH, and sp3 -hybridized C-H bonds in substrates, R-H. Aryl or heteroaryl acetates may also be used for C-H to C-OAr bond formation. The methods are also useful in the preparation of C-S bonds from acetyl-protected thiols, MeC(0)SR, and disulfides, RSSR. Advantageously, the methods minimize reaction steps, the handling of oxidized intermediates, and environmental impact.