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Acid Oil
Acid oil, which is a by-product in vegetable oil refining, mainly contains free fatty acids (FFAs) and acylglycerols, and is a candidate of materials for production of biodiesel fuel. … The two-step system was thus applied to conversion of acid oil by-produced in vegetable oil refining to biodiesel fuel.
The quantity of acid addition depends on the TFA – Total Fatty Acid present in the soap stock. General quantum is in the range of 10 to 14%.
The acid water is subjected to treatment with wash water thereby dropping the pH level of the acidic water. This resulting mixture is passed into the effluent treatment plant and that completes the acid oil plant process.
Finally, the acidic fumes generated from the reaction vessel are passed through water circulation and scrubbed by fumes scrubber to prevent corrosion in plant.
The Acid oil is further washed by hot water and made free from mineral acidity. The Free Fatty Acid content in Acid oil ranges from 60 to 85% and total fatty matter content about 96%.
The reason for giving open steam to the soap stock is to evaporate the moisture content from the mixture to the maximum possible content. This also helps on the terms of minimizing acid consumption for splitting.