摘要:
The invention relates to a supported catalyst used in the production of cycloalkadienes in a metathesis reaction containing a) η-Al2O3 as supporting material; b) 2-20 wt.% Re2O7; c) 0.5-5 wt.% B2O3; d) 0-20 wt.% SnR4 or SnO2, or a mixture of SnR4 and SnO2, in which R stands for an alkyl or aryl radical. The invention also relates to a method for producing cycloalkadienes in the liquid phase by metathesis reaction of cycloalkenes, cyclopolyenes, linear polyenes and their mixtures in the presence of the supported catalyst.
摘要:
Herstellung von olefinisch ungesättigten aliphatischen oder cycloaliphatischen Kohlenwasserstoffen durch Erhitzen von Alkancarbonsäuren mit 3 bis 20 Kohlenstoffatomen, Alkandicarbonsäuren mit 4 bis 20 Kohlenstoffatomen oder 5-oder 6-gliedrigen Cycloalkancarbonsäuren oder deren Alkyl-, Cycloalkyl-, Aralkyl- oder Phenylester auf Temperaturen von 250 bis 800°C in der Gasphase in Gegenwart von Katalysatoren, wobei man Katalysatoren verwendet, deren katalytisch aktive Masse aus Bortrioxid, Borsäure und/oder Bornitrid sowie mindestens aus einem der Oxide von Aluminium, Silizium, Zinn, Blei, Titan oderzirkonium besteht.
摘要:
A stabilized cyclic alkene composition comprising one or more cyclic alkenes, and at least one antioxidant compound having the formula (I), wherein R1 through R5 can each independently be H, OH, C1-C8 linear, branched, or cyclic alkyl, C1-C8 linear, branched, or cyclic alkoxy or substituted or unsubstituted aryl, and wherein the antioxidant compound is present in an amount between 1 ppm and 200 ppm and has a boiling point lower than 265 °C. A method for forming a layer of carbon-doped silicon oxide on a substrate, which uses the stabilized alkene composition and a silicon containing compound.
摘要:
A process for enhancing the polymerization activity of mixtures of one or more cycloolefin monomers is provided by treatment with heat. This process can be easily incorporated into ring-opening, bulk polymerization methods and methods which form high molecular weight monomers. Enhancing the polymerization activity of crude mixtures of cycloolefin monomers by this process permits polymers having higher glass transition temperatures and higher heat distortion temperatures to be produced with greater economy.
摘要:
A method of performing a reaction is disclosed comprising flowing a reaction mixture (50) comprising HF past a compression seal (40) within a flow reactor (20), wherein the compression seal (40) includes an O-ring or gasket (30, 32) and where the O-ring or gasket (30, 32) comprises fluoroelastomer (to include fluoroelastomers and perfluoroelastomers), while maintaining the reaction mixture comprising HF at a temperature of 50° C or greater [generally at a temperature in the range of from 50° C and greater (60, 70, 80, 90, 100, 120, 150, and 180° C) up to 220° C], using O-rings or gaskets (30, 32) that comprise a fluoroelastomer having a pre-use tensile strength in the range of from 0.1 to 14 MPa measured according to ISO37, and desirably further having a compressive set in the range of from 0 to 12% measured according to ISO815.