Process for recovery and purification of lactic acid

C - Chemistry – Metallurgy – 12 – P

Patent

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C12P 7/56 (2006.01) C12M 1/12 (2006.01)

Patent

CA 2662871

The present invention relates to a process for recovery and purification of lactic acid from a fermentation broth containing lactic acid. The process comprises subjecting the fermentation broth to ultralfiltration and/or microfiltration to form a first permeate, concentrating the first permeate to form concentrated broth, subjecting the concentrated broth to supported liquid membrane for extraction of lactic acid into a separate stream, subjecting the extracted lactic acid solution to activated carbon for removal of colour, subjecting the extracted lactic acid solution to cation exchange resin for deminerization, subjecting the extracted lactic acid solution to anion exchange resin for removal of anionic impurities and concentrating the extracted lactic acid solution to desired concentration. The supported liquid membrane of the present invention contains an organic layer that comprises a earner, a co-extractant, a diluent and a stabilizer.

La présente invention concerne un procédé pour la récupération et la purification d'acide lactique à partir d'un bouillon de fermentation contenant de l'acide lactique. Le procédé consiste à soumettre le bouillon de fermentation à une ultrafiltration et/ou à une microfiltration pour former un premier perméat, à concentrer le premier perméat pour former un bouillon concentré, à soumettre le bouillon concentré à une séparation sur membrane liquide supportée pour effectuer l'extraction de l'acide lactique sous forme d'un flux séparé, à mettre la solution d'acide lactique extraite en contact avec du charbon actif pour enlever la couleur, à mettre la solution d'acide lactique extraite en contact avec une résine échangeuse de cations pour effectuer la déminéralisation, à mettre la solution d'acide lactique extraite en contact avec une résine échangeuse d'anions pour éliminer les impuretés anioniques et à concentrer la solution d'acide lactique extraite à une concentration souhaitée. La membrane liquide sur support de la présente invention contient une couche organique qui comprend un support, un co-extractant, un diluant et un stabilisant.

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