Neutralization of tall oil soap

C - Chemistry – Metallurgy – 09 – F

Patent

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Details

C09F 1/00 (2006.01) C11B 13/02 (2006.01)

Patent

CA 2220111

The invention relates to a method for improving the separation of water in a tall oil preparation process which comprises: a neutralization step, in which a mixture of tall oil soap and water is neutralized with carbon dioxide; a water separation step, in which the aqeuous phase containing bicarbonate is separated from the tall oil soap; and a cooking step, in which the tall oil soap obtained from the previous step is cooked with sulfuric acid in order to form tall oil, the improvement comprising the fact that, after the neutralization with carbon dioxide but before the water separation step, the pH is adjusted with an acidically reacting substance, such as bisulfite. The invention also relates to a method for the preparation of tall oil, the method comprising the steps stated above.

Cette invention concerne un procédé permettant d'améliorer la séparation de l'eau au cours du processus de préparation du tallöl qui consiste tout d'abord en une étape de neutralisation au cours de laquelle on neutralise un mélange de savon de tallöl et d'eau avec du dioxyde de carbone, puis en une étape de séparation de l'eau au cours de laquelle on extrait du savon de tallöl la phase aqueuse contenant du bicarbonate, et enfin en une étape de cuisson au cours de laquelle on cuit le savon de tallöl, obtenu lors de l'étape précédente, avec de l'acide sulfurique de façon à produire le tallöl. Le perfectionnement de l'invention consiste à procéder, après la neutralisation par le dioxyde de carbone mais avant l'étape de séparation de l'eau, à un ajustement du PH par une substance à réaction acide, telle qu'un hydrogénosulfite. Cette invention concerne également un procédé de préparation de tallöl qui consiste à procéder aux étapes décrites ci-dessus.

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