Publisher : The Korean Society of Wood Science Technology
DOI : 10.5658/WOOD.2016.44.4.477
Title & Authors
Optimization of Acetic Acid Recovery Using Tri-n-alkylphosphine Oxide from Prepulping Extract of Hemicellulose by Response Surface Methodology Kim, Seong Ju; Park, Seong-Jik; Um, Byung Hwan;
A single process using hot water (0% green liquor) and green liquor (GL) was investigated for pre-pulping extraction on two types of raw material. The GL was applied at different alkali charges of 0-5% on a dry wood weight basis. The extractions were performed at an H-factor 900 at . The 0% and 3% GL extraction detected acetic acid (AA) at 10.02 and , extracts derived from hardwood, 2.46 and , extracts derived from softwood, respectively. The single liquid-liquid extraction (LLE) was studied using tri-n-alkylphosphine oxide (TAPO). Response surface methodology (RSM) was employed as an efficient approach for predictive model building and optimization of AA recovery conditions. The extraction of AA was evaluated with a three-level factorial design. Three independent variables, pH (0.5-3.5), temperature (), and residence time (24-48 min) were investigated. Applying the RSM models obtained, the optimal conditions selected of extracts derived from hard- and softwood with a 3% GL were approximately pH 1.4, , 43.8 min and approximately pH 0.7, , 24.6 min, respectively. The predicted and experimental values of AA recovery yield were similar whilst sugar retention was 100%.
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