Method for recovering and purifying propionic acid

摘要

The present invention provides a method for purifying and recovering propionic acid from an aqueous mixture containing a fermentation product obtained from a fermentation process using glycerol as substrate, the method comprising optionally acidifying the aqueous mixture to a pH below 4.5, subjecting the aqueous mixture to an extraction with extracting agent containing a heavy extractant and optionally a light extractant as a diluent to obtain an extract comprising the extracting agent and organic acids, and a raffinate comprising water and any unreacted glycerol, and subjecting the extract to vacuum evaporation to separate propionic acid-containing organic acids from the extractant.

主权项

1. A method for purifying and recovering propionic acid from an aqueous mixture containing a fermentation product obtained from a fermentation process using glycerol as substrate, wherein the method comprises
subjecting the aqueous mixture to an extraction with an extracting agent to obtain an extract containing the extracting agent and organic acids, and a raffinate containing water and any unreacted glycerol, and subjecting the extract to a vacuum evaporation to separate propionic acid-containing organic acids from the extractant.