The composition of tall oil fatty acids includes rosin acids and unsaponifiable substances as impurities. The latter include stilbenes. The total content of stilbenes in tall oil and fatty acids can reach 1%. The presence of stilbenes contributes to the deterioration of fatty acids color during storage and production of some derivatives. The existing methods for removing stilbenes are based on the treatment of sorbents, formaldehyde and boron trifluoride etherate. The phosphorus pentoxide treatment has a purifying effect, which allowed reducing the pinosylvin ethers content to 0.05%.

中文翻译：

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通过去除芪脂来纯化妥尔油脂肪酸

妥尔油脂肪酸的组成包括松香酸和不皂化物作为杂质。后者包括丁苯橡胶。妥尔油和脂肪酸中丁苯二酚的总含量可达到1％。在某些衍生物的储存和生产过程中，芪酯的存在会导致脂肪酸颜色的恶化。现有的去除对苯二酚的方法是基于吸附剂，甲醛和三氟化硼醚化物的处理。五氧化二磷处理具有净化作用，可以将松油基乙烯基醚的含量降低到0.05％。