Separation and purification of lactic acid: Fundamental studies on the reverse osmosis down-stream process
✍ Scribed by M.K.H. Liew; S. Tanaka; M. Morita
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 573 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
The physico-chemical properties and effects of lactic acid and lactates in the reverse osmosis process were investigated using a polyamide composite membrane. The membrane was found to swell at pH 2.2, yet has no detectable solute-membrane affinity. The decrease in flux and increase in the solute reduction factor of lactic acid (0.66 m3.m-2.d-l; 5.8), anunonium lactate (0.30 m3.m-2.d -1; 18.3) and sodium lactate (0.18 m3.m-2.d-1; > 80) were found to be related to the concentration of ions dissociated into solution as affected by the pH of the feed. The effects of operating parameters such as pressure, feed concentration and stirring speed were also discussed. Optimum operating conditions were found to be 7 MPa and 900 rpm.