Transport Studies of Lactic Acid Through Supported Liquid Membrane

A. G. Gaikwad

Abstract
The aim of this study is to present transport of lactic acid through contained supported liquid membrane (CSLM). The liquid membrane carriers used were Alamine 336 and TBP. The formation of acid amine and solvation or ion pair complexes are dominating factors for the transport of lactic acid through liquid membrane. Diluting solvent used in this study is toluene. The permeability coefficient was calculated from the experimental results and interpreted for dependency on experimental variables. Different experimental variables investigated were stirring of source and receiving bulk phases, effect of pH of source phase, effect of sodium hydroxide concentration in receiving phase, TBP or Alamine 336 concentration in membrane phase, lactic acid concentration in source phase, etc. The pre-concentration of lactic acid has been investigated in the concentration range 10–6 to 10–2 mol L–1. The transport of lactic acid has been studied for individual as well as combined system of Alamine 336 and TBP. It was observed that mixed extractants system of Alamine 336 and TBP is more effective for transport of lactic acid from source to receiving phase. The stability of CSLM system observed was quite good for the period of 50 h.

This work is licensed under a Creative Commons Attribution 4.0 International License

Keywords
lactic acid, Alamine 336, liquid membrane, transport by combined effect, Tributyl phosphate, pre-concentration