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Due to superior characteristics, ionic liquids (IL) have become a more environmentally friendly alternative to traditional toxic, flammable, and volatile organic solvents. Protocatechuic acid (PCA) is a widely distributed phenolic acid and a key metabolite of complex polyphenols. It is a molecule that functions as a chemical building block for polymers and plastics as well as has pharmacological effects. The current project’s goal is to enhance the recovery of PCA by IL-based extraction from industrial waste streams and fermentation. This research investigates the separation of PCA from an aqueous stream using Imidazolium-based IL, 1-butyl-3-methylimidazolium octyl sulfate and 1-Hexyl-3-methylimidazolium hexafluorophosphate with an efficiency of about 87% at 10% IL concentration for a PCA concentration of 10 mmol L −1 . The influence of the initial PCA concentration and IL concentration on the separation efficiency was also investigated, and various parameters helpful for the design of an industrial separation unit were determined.

Ionic liquids as green solvents in process industry for reaction and separation: emphasizing on protocatechuic acid recovery