Treatments of free fatty acids to prevent or decrease colour fixation in cottonseed oil
Keywords:Colour fixation, Cottonseed oil, Ethanolamine, Free fatty acid (treatment), Sodium carbonate
Some treatments have been investigated to prevent or remove colour fixation of cottonseed oil containing high level of free fatty acids without using excess of sodium hydroxide in the refining step. The treatments included use of sodium carbonate and ethanolamine before and after subjecting a crude cottonseed oil containing excess of free fatty acid to a colour fixation treatment.
The results revealed that the carbonate/ethanolamine treatment improved the oil colour by decreasing the free fatty acids and gossypol in the oil, without using any excess of sodium hydroxide.
Carrying out the carbonate/ethanolamine treatment on cottonseed oil with high levels of free fatty acid before colour fixation takes place is more recommended than carrying out the same treatment on the same oil after it has been fixed.
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