Lactic acid extraction from cheese whey using ion exchange resins

Overview

This innovative solution focuses on the extraction of high-purity lactic acid from cheese whey, a by-product of the dairy industry, using a combination of cationic and anionic ion exchange resins. The method is designed to achieve up to 90% purity, offering a sustainable approach to producing lactic acid, which is a valuable precursor for synthesizing polylactic acid (PLA), a biodegradable polymer with numerous industrial applications.

Technical specifications

The process begins by fermenting cheese whey, followed by the removal of biomass. The fermentation broth is then treated with anionic resin, where hydroxyl ions are exchanged for lactate ions. The lactic acid is then extracted through desorption of the resin. This method, demonstrated in a doctoral thesis, effectively controls pH using sodium hydroxide during fermentation. The approach is particularly suited for industries looking to valorize dairy waste and produce eco-friendly materials.

Technology readiness level

This technology is at TRL 5, indicating that it has been validated in a relevant environment and is progressing towards full-scale application in the production of polylactic acid from lactic acid extracted from cheese whey.