Patent ID: 6013843
Filing Date: 2000-01-11
Classification: B01J,C07C

Abstract:
In a process for continuous industrial production of aldehydes ##STR6## where (isoprenal) R.sup.1 is hydrogen and R.sup.2 is ##STR7## by oxidative dehydrogenation of the corresponding alcohols with an oxygen-comprising gas over a supported catalyst consisting of copper, silver and/or gold on an inert support in a tube bundle reactor, rapid cooling of the reaction gases and removal of the aldehydes from the resulting condensate while recycling the unconverted alcohols, which comprisesa) vaporizing 3-alkylbuten-1-ols of the general formula II ##STR8## b) admixing the alcohol vapor with an oxygen-comprising gas, c) the improvement comprising initially passing the resulting oxygen-comprising alcohol vapor at above the dew point of the alcohol but below the commencement temperature of the reaction through a layer of one of the abovementioned supported catalysts which is at least 0.5 cm in thickness and only thend) reacting the oxygen-comprising alcohol vapor at from 300 to 600.degree. C. in parallel reaction tubes surrounded by a fluidic-heat transfer medium, packed with the supported catalyst and having an internal diameter D of from about 0.5 to 3 cm and a length of at least 5 cm, to form the corresponding aldehyde.