摘要:
The invention relates to a method for preparing acrolein from glycerol or glycerine, according to which the glycerol or glycerine is dehydrated in the presence of a catalyst that consists of least one silica modified by zirconium dioxide, titanium dioxide or tungsten trioxide or any combination of said oxides, and a heteropolyacid. Said method can be used for the production of 3-(methylthio)propionaldehyde (MMP), 2-hydroxy-4(methylthio)butyronitrile (HMTBN), methionine or analogue substances thereof, using acrolein.
摘要:
The present invention relates to the use of an alumina-supported rhenium oxide catalyst for the deoxydehydration of glycerol to allyl alcohol, as well as to a process for the production of allyl alcohol from glycerol in the presence of such a heterogeneous catalyst.
摘要:
The present invention relates to a method for producing hydrogen at a low temperature from alcohols without forming carbon, using a cerium and nickel oxyhydride material, and to the use of such a material as a catalyst for transforming alcohols into hydrogen.
摘要:
The present invention relates to the use of molybdenum and vanadium mixed oxides, optionally iron doped, as catalysts for the oxidation of unsaturated alcohols, in particular allyl alcohol, and also to a process for the production of unsaturated carboxylic acids, in particular acrylic acid, in the gas phase, in the presence of such a catalyst.
摘要:
According to one embodiment, the invention relates to a method for synthesising a second ester from a first ester, said method including the following steps: a) placing a first ester and a catalyst in the presence of dihydrogen such as to obtain a first alcohol and a second alcohol; b) extracting said second alcohol from the reaction medium; c) reacting said first alcohol with the catalyst of step a) in order to obtain a second ester and dihydrogen; and d) recirculating the dihydrogen obtained in step c) by injecting same into step a).
摘要:
The invention relates to the use of haloapatites as a catalyst in the dehydration reaction of α-hydroxylated carboxylic acids or acid esters, in particular lactic acid or methyl lactate, as well as to a method for synthesizing unsaturated carboxylic acids or acid esters, in particular acrylic acid or methyl acrylate, in the gaseous phase in a stainless steel reactor in the presence of a catalyst of said type.