Journal
10TH ECO-ENERGY AND MATERIALS SCIENCE AND ENGINEERING SYMPOSIUM
Volume 34, Issue -, Pages 898-904Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2013.06.827
Keywords
D,L-Lactic acid; Polytetrafluoroethelene membrane; Filtration process; Chiral selector
Funding
- National Innovation Agency (NIA)
- Ministry of Science and Technology, Thailand
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The purpose of this research was to study the optimum conditions for separation of D,L-lactic acid isomer by filtration process using polytetrafluoroethelene (PTFE) membrane filter. The study on suitable chiral selector by adding chiral selector into D,L-lactic acid and separate through membrane filter showed that the separation time of 30 min by using 2.67 g/l (v/v) beta-cyclodextrin as chiral selector was the most suitable for separation of D,L-lactic acid isomer. Efficiency of carrier on separation of D,L-lactic acid isomer was studied. D,L-lactic acid was separated through the carrier impregnated membrane filter, the results showed that modified Aliquat (TM) 336 in carbonate form was the most efficient for separation of D,L-lactic acid isomer. In addition, efficiency improvement of D,L-lactic acid isomer separation was carried out by using beta-cyclodextrin as chiral selector, the impregnated membrane filter with modified Aliquat (TM) 336 and 2 stages of separation by filtration process that separation time of 30 min each step. It was found that the first separation stage could be separate D-lactic acid from L-lactic acid in transmembrane solution, the D,L-lactic acid separation factor achieved was 2.93. High efficiency of D,L-lactic acid isomer separation was obtained from the second stage and separation factor was as high as 4.43 in this stage. (C) 2013 The Authors. Published by Elsevier B.V.
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