Study of lactic acid extraction with higher molecular weight aliphatic amines

✍ Scribed by Bijan Choudhury; Aslam Basha; Tyagarajan Swaminathan

• Publisher: Wiley (John Wiley & Sons)
• Year: 1998
• Tongue: English
• Weight: 222 KB
• Volume: 72
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/(sici)1097-4660(199806)72:2<111::aid-jctb878>3.0.co;2-o

✦ Synopsis

Lactic acid extraction was studied with two extractants, trioctyl amine (TOA) and Aliquat 336, in three diluents (methylisobutyl ketone (MIBK), octanol and paraffin liquid). The e †ects of organic phase extractant concentration and aqueous phase pH on the extraction process were examined. Among the extractants, TOA was found to be a better extractant than Aliquat 336 in all the diluents. In experiments with 50% (v/v) TOA in methylisobutyl ketone, 79% lactic acid could be extracted (initial lactic acid concentration 86É96 g dm~3). MIBK had a profound e †ect on the extraction behaviour of TOA in comparison with octanol and paraffin liquid while none of the diluents a †ected the extraction with Aliquat 336. The extraction of lactic acid was favoured at low pH. The toxicities of TOA and the diluents to L actobacillus rhamnosus NRRL B445 were also studied. While TOA was found to be highly toxic at the molecular and the phase level, the paraffin liquid was totally non-toxic. The extraction of glucose and yeast extract by TOA and the diluents used was found to be low, which thus enables the selective extraction of lactic acid.

1998 SCI