Process for preparing soap-acyl isethionate compositions

C - Chemistry – Metallurgy – 11 – D

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134/3.2

C11D 1/14 (2006.01) C11D 9/26 (2006.01) C11D 9/32 (2006.01)

Patent

CA 2040451

A batch and continuous process is disclosed for the production of a composition comprising alkali metal salts of C8-C22 alkyl fatty monocarboxylic acid and C8-C22 acyl isethionate in a ratio of 20:1 to 1:0.98. Both batch and continuous routes require that the saponifying aqueous caustic solution includes sodium hydroxide and sodium isethionate added as a hot solution. For the batch route, the sequence of steps requires the caustic solution to be added slowly to the fatty acid. In the continuous process, it is advantageous to introduce fatty acid upstream from the point where the caustic solution stream enters the mixing chamber. Addition of the acyl isethionate either precedes addition of caustic solution, which then is added at a temperature of at least 80°C, or else is subsequent to addition of caustic solution.

On divulgue un procédé en discontinu et en continu pour la production d'une composition comprenant des sels de métal alcalin d'un acide gras monocarboxylique en C8-C22 et d'iséthionate d'acyle en C8-C22 dans un rapport de 20:1 à 1:0,98. Les voies en discontinu et en continu exigent toutes deux que la solution caustique aqueuse saponifiante comprenne de l'hydroxyde de sodium et de l'iséthionate de sodium ajoutés sous forme de solution chaude. Dans le cas du procédé en discontinu, la séquence des étapes nécessite que la solution caustique soit ajoutée lentement à l'acide gras. Dans le procédé en continu, il est préférable d'introduire l'acide gras en amont du point où le courant de solution caustique pénètre dans la chambre de mélange. L'addition de l'iséthionate d'acyle peut soit précéder l'addition de la solution caustique, qui est alors ajoutée à une température d'au moins 80 degrés C, ou encore, elle peut faire suite à l'addition de la solution caustique.

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