Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 461, Issue -, Pages 114-122Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.03.023
Keywords
Membrane fractionation; Temperature variation; Biobutanol
Categories
Funding
- U.S. Department of Education
- Phillips66
Ask authors/readers for more resources
To help elucidate the mechanisms for solute transport in polyamicle (PA) and cellulose acetate (CA) reverse-osmosis membranes, we have conducted temperature-variation permeation experiments with aqueous solutions containing NaCl and 3- and 4-carbon solutes that possess different numbers of hydroxyl groups. Mass transport metrics were calculated using the solution-diffusion model and the Eyring equation. The molar volume of the neutral (organic) solute is less important than the number of hydroxyl groups in determining solute permeance. For both membrane materials, the neutral solutes with higher permeance also have higher activation enthalpies for permeation, and higher predicted solubilities in the polymer based on Hansen solubility parameters. The higher activation enthalpies may be associated with lower mobility due to more favorable polymer-penetrant interactions. The solution-diffusion permeance coefficients provide a reasonable estimate of permeate composition at different pressures with a new set of membranes. AL elevated temperatures of 320 K, we found negative rejections of n-propanol and n-butanol in the CA membrane, while maintaining relatively high electrolyte and glycerol rejections. Using these results, we suggest a strategy to efficiently harvest n-butanol produced by Clostridium pasteurianum while retaining its glycerol carbon source and nutrient electrolytes. (c) 2014 Elsevier By. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available