摘要:
Cyclic .alpha.,.beta.-unsaturated ethers are prepared by isomerizing the corresponding .beta.,.gamma.-unsaturated ethers at from 50.degree. to 250.degree. C. in the presence of an iron carbonyl as the catalyst, and of a base.
摘要:
Isoprene is recovered from a C.sub.5 -hydrocarbon mixture containing isoprene, penta-1,3-diene and cyclopentadiene by separating the said mixture by liquid-liquid extraction or extractive distillation with the aid of a selective solvent, in combination with a distillation upstream or downstream from the liquid-liquid extraction or extractive distillation, by a method in which a stream containing penta-1,3-diene and cyclopentadiene is separated off in the upstream or downstream distillation and is catalytically hydrogenated, and the hydrogenated stream is fed to the upper part of the liquid-liquid extraction or extractive distillation.
摘要:
A process for removing formaldehyde from aqueous solutions of but-2-yne-1,4-diol by treating the solutions with an alkaline agent at an elevated temperature in the presence of hydrogen peroxide.
摘要:
The process for the manufacture of but-2-en-1-ol compounds by isomerizing but-3-en-1-ol compounds in the presence of a palladium catalyst and of hydrogen is improved by modifying the palladium catalyst with selenium or tellurium.The but-2-en-1-ols manufactured according to the invention are either solvents or valuable starting materials for the manufacture of solvents, dyes, surface coatings, paints and pesticides.