Arkema France

Georges Martino-Gauchi

Guillaume Le

Serge Hub

Philippe Maj

Jean-Francois Devaux

Sandra Grimaldi

Reinhard Linemann

Rémy Teissier

Jean-François Devaux

Jean-Marc Corpart

Jean-Yves Balouin

Patrice Iafrate

The present invention relates to a method for the transesterification of a hydroxylated oil including two consecutive transesterification steps performed in the presence of a light alcohol (methanol or ethanol) and a basic catalyst under temperature, pressure and alcohol/oil weight ratio conditions enabling the nearly total conversion of the hydroxylated oil into fatty acid esters. Characteristically, a resulting directly from the first transestrefication step in order to obtain a reaction mixture including, in particular, hydroxylated fatty acid esters and glycerol. Said reaction mixture is subjected to a separation step that makes it possible to obtain a less dense phase predominantly consisting of fatty esters and a denser phase predominantly consisting of glycerol and water and fatty acid soaps. The second transesterification step is performed on the less dense phase, with said light alcohol and said basic catalyst are added thereto.

Method for the transesterification of hydroxylated oils

The present invention relates to a process for the continuous preparation of selected organic peroxides using plate exchangers having a high heat exchange capacity.

Process for synthesizing selected organic peroxides

The present invention relates to a process for the preparation of dimethylketene (DMK) and then of polydimethylketene (PDMK) by polymerization of DMK. More specifically, the DMK is obtained by pyrolysis by isobutyric anhydride (IBAN), the latter decomposing under the effect of heat (pyrolysis) to give isobutyric acid (IBA) and DMK. One mole of pyrolyzed IBAN gives one mole of IBA and one mole of DMK.

Method of preparing dimethylcetene and, subsequently, polydimethylcetene from isobutyric anhydride

The invention concerns a continuous method for preparing ethyl lactate by esterifying lactic acid with ethanol, in the presence of a catalyst which comprises reacting said lactic acid with ethanol in an initial ethanol/lactic acid mol ratio not less than 2.5, in the presence of a catalyst, at a reflux of the reaction medium of about 100&#xb0; C. under absolute pressure ranging between 1.5 to 3 bars. Said method is characterized in that it comprises continuously extracting from the esterification reaction medium a near-azeotropic water/ethanol gas mixture: than dehydrating said gas mixture directly using molecular sieves, than recuperating from said dehydration an ethanol gas stream capable of being recycled to the esterification reaction medium and a flow consisting of water and ethanol which is subjected to distillation wherefrom is obtained water and an azeotropic water/ethanol mixture which is injected into the distillation column head of the gas mixture extracted from the esterification reaction medium; then in continuously extracting crude ethyl lactate which is subjected to purification wherefrom are obtained high purity ethyl lactate and heavy products.

Continuous method for preparing ethyl lactate

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Lyons, France

Georges Martino-Gauchi