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.
摘要:
The invention concerns the use of a compound of formula Sb x Fe 1 O y (I) in which x varies from 0.4 to 1 inclusive and y varies from 1.6 to 4 inclusive, as a catalyst for catalysing the ammoxidation reaction of an alcohol of the following formula (II) CH2=C(R 1 )-CH 2 -OH (II), in which R 1 represents a hydrogen atom or a methyl radical, into a nitrile of the following formula (III) CH 2 =C(R 1 )-C≡N (III) in which R 1 has the same meaning as in formula (II) above, said reaction being carried out in the gaseous phase, said gaseous phase comprising at least oxygen and ammonia. It also concerns the method for the ammoxidation of an alcohol of formula (II) using a compound of formula (I) as catalyst.
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 a device (1) for evaluation of at least one performance criterion of heterogeneous catalysts, comprising; at least one reactant source (2), at least one reaction zone equipped with at least one catalyst and connected to at least one reactant source (2) in such a way as to produce, in each reaction zone, a heterogeneous catalytic reaction between each catalyst present in the reaction zone and the reactant or reactants coming from each reactant source (2) connected to the reaction zone, and means for evaluation of at least one performance criterion of heterogeneous catalysts, characterized in that the device (1) further comprises a gas chromatograph and in that each reaction zone (9) is situated in an injector (8) of the gas chromatograph.