Comparison of Amberchrom-CG161C and Dowex99 as the adsorbent of a four-zone simulated moving bed process for removal of acetic acid from biomass hydrolyzate

Purification of xylose in simulated hemicellulosic hydrolysates using a two-step emulsion liquid membrane process

“…Dilute sulfuric acid hydrolysis has been most widely used to obtain a hemicellulosic hydrolysate from the lignocellulosic biomass (Grzenia et al, 2008). The hemicellulosic hydrolysate contains not just xylose-rich sugars but also inhibitors such as carboxylic acids, furans and phenolic compounds, which limit the yield of ethanol by suppressing fermentative organisms (Arruda et al, 2009;Nam et al, 2011). Among them, acetic acid is the most toxic compound for the organisms and exists in the largest amount (Nam et al, 2011;Parajó et al, 1998;Zhou et al, 2013a,b).…”

“…The hemicellulosic hydrolysate contains not just xylose-rich sugars but also inhibitors such as carboxylic acids, furans and phenolic compounds, which limit the yield of ethanol by suppressing fermentative organisms (Arruda et al, 2009;Nam et al, 2011). Among them, acetic acid is the most toxic compound for the organisms and exists in the largest amount (Nam et al, 2011;Parajó et al, 1998;Zhou et al, 2013a,b). Also, even though the hydrolysates contain a small quantity of sulfuric acid, pH of the hydrolysates is too low to ferment the sugars effectively.…”

“…Many researchers have recently tried to remove acetic acid from simulated or real hemicellulosic hydrolysates using various separation technologies such as nanofiltration and hyperfiltration membranes (Weng et al, 2009;Zhou et al, 2013a,b), adsorption and chromatography (Nam et al, 2011;Sainio et al, 2011), liquid extraction (Grzenia et al, 2008) and biological treatment (Schneider, 1996). Because of low separation factor and/or high equipment and operating costs, they were unlikely to be economically efficient.…”

Application of Emulsion Liquid Membrane to Removal of Fermentation Inhibitors from Simulated Hemicellulosic Hydrolysates

“…Also, when HBA was added to the basic simulated hemicellulosic hydrolysate, both of acetic acid and HBA in the feed phase could be selectively removed up to 99% in an ELM system with tributyl phosphate as extractant. [5,7,8]. …”

Simulated Moving Bed Chromatography: Separation and Recovery of Sugars and Ionic Liquid from Biomass Hydrolysates

“…[10] In recent years, SMB chromatography has been used increasingly for the separation of biomass components. [11] SMB chromatography emulates counter-current separation wherein the mobile phase flows in the opposite direction of the solid phase (Figure 2). The solid phase is represented by the individual columns connected in series; the mobile phase is represented by inlet streams of feed and eluent, and outlet streams of raffinate and extract.…”