Method for acidulation

The method of acidulating sodium salts of fatty and rosin acids in alcohols with carbon dioxide addresses inefficiencies in CTO processing, achieving high-quality free acid mixtures and simplifying the recovery of valuable compounds like phytosterols.

WO2026126010A1 Publication Date: 2026-06-18STORA ENSO OYJ
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
STORA ENSO OYJ
Filing Date
2025-12-03
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing methods for processing crude tall oil (CTO) to separate free fatty and rosin acids are inefficient, leading to ester formation during high-temperature distillation, thermal decomposition, and require additional steps to produce free phytosterols, while handling sodium salts of fatty and rosin acids in alcohols is challenging due to foaming and stickiness.

⚗Method used

A method involving acidulation of a mixture of sodium salts of fatty and rosin acids in alcohols using carbon dioxide, allowing conversion to free fatty and rosin acids without sulfuric acid, and utilizing varying water-alcohol ratios to achieve phase separation or solubility for efficient recovery.

🎯Benefits of technology

Enables the production of high-quality free fatty and rosin acid mixtures with improved yield and reduced process complexity, avoiding ester formation and thermal issues, and facilitating the recovery of valuable components like phytosterols.

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Abstract

The present invention is directed to a method for acidulation of tall oil soap in an alcohol selected from methanol, ethanol and / or iso-propanol. In the method according to the present invention, a mixture comprising sodium salts of fatty acids and rosin acids and an alcohol selected from methanol, ethanol and / or iso-propanol is acidulated using carbon dioxide.
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