title: Purification of xylose in simulated hemicellulosic hydrolysates using a two-step emulsion liquid membrane process.
abstract: Purification of xylose in simulated hemicellulosic hydrolysates was attempted using a two-step emulsion liquid membrane (ELM) process. The effects of various experimental variables on extraction of each component in the hydrolysates were investigated in the ELM steps. In the first ELM step, acetic acid could be selectively removed from the hydrolysates and highly enriched in the stripping phase, and loss of xylose was insignificant. In the second ELM step, sulfuric acid could be selectively removed from simulated acetic acid-free hemicellulosic hydrolysates and somewhat enriched in the stripping phase. There was just small loss of xylose, and the final pH of the feed phase approached a pH level suitable for ethanol fermentation. Also, concentration of xylose in the feed phase was attained as an incidental outcome during each ELM run. Conclusively, the two-step ELM process was found to be a promising futuristic technology for purification of sugars in real hemicellulosic hydrolysates.
authors.affiliation: Department of Chemical Engineering, Kunsan National University, 558 Daehak-ro, Kunsan, Chonbuk 573-701, Republic of Korea. Electronic address: lee40f@kunsan.ac.kr.
authors.forename: Sang Cheol
authors.initials: SC
authors.lastname: Lee
mesh_terms: D019342:Acetic Acid / Q000302:isolation & purification / Q000494:pharmacology; D000588:Amines / Q000302:isolation & purification; D001709:Biotechnology / Q000379:methods*; D004655:Emulsions / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D008567:Membranes, Artificial; D011134:Polysaccharides / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000494:pharmacology; D013464:Sulfuric Acids / Q000302:isolation & purification / Q000494:pharmacology; D013501:Surface-Active Agents / Q000737:chemistry; D014994:Xylose / Q000302:isolation & purification*
chemical_list: D000588:Amines; D004655:Emulsions; D008567:Membranes, Artificial; D011134:Polysaccharides; D013464:Sulfuric Acids; D013501:Surface-Active Agents; D012972:Sodium Hydroxide; C007916:hemicellulose; D014994:Xylose; C033158:sulfuric acid; D019342:Acetic Acid
keywords: Acetic acid; Emulsion liquid membrane; Simulated hemicellulosic hydrolysate; Two-step ELM process; Xylose