Performance and techno-economic assessment of several solid-liquid separation technologies for processing dilute-acid pretreated corn stover.

Solid-liquid separation of pretreated lignocellulosic biomass slurries is a critical unit operation employed in several different processes for production of fuels and chemicals. An effective separation process achieves good recovery of solute (sugars) and efficient dewatering of the biomass slurry. Dilute acid pretreated corn stover slurries were subjected to pressure and vacuum filtration and basket centrifugation to evaluate the technical and economic merits of these technologies. Experimental performance results were used to perform detailed process simulations and economic analysis using a 2000 tonne/day biorefinery model to determine differences between the various filtration methods and their process settings. The filtration processes were able to successfully separate pretreated slurries into liquor and solid fractions with estimated sugar recoveries of at least 95% using a cake washing process. A continuous vacuum belt filter produced the most favorable process economics.

[1]  M. Modigell,et al.  Mechanical Pretreatment of Lignocellulosic Biomass Using a Screw Press as an Essential Step in the Biofuel Production , 2012 .

[2]  James D. McMillan,et al.  Dilute-sulfuric acid pretreatment of corn stover in pilot-scale reactor , 2003 .

[3]  Ryan Davis,et al.  Process Design and Economics for Biochemical Conversion of Lignocellulosic Biomass to Ethanol: Dilute-Acid Pretreatment and Enzymatic Hydrolysis of Corn Stover , 2011 .

[4]  Kelly N. Ibsen,et al.  Lignocellulosic Biomass to Ethanol Process Design and Economics Utilizing Co-Current Dilute Acid Prehydrolysis and Enzymatic Hydrolysis for Corn Stover , 2002 .

[5]  Wei E Huang,et al.  When single cell technology meets omics, the new toolbox of analytical biotechnology is emerging. , 2012, Current opinion in biotechnology.

[6]  Patrick C. Gilcrease,et al.  Enhanced solid-liquid clarification of lignocellulosic slurries using polyelectrolyte flocculating agents. , 2011 .

[7]  G. Huber,et al.  Production of Liquid Alkanes by Aqueous-Phase Processing of Biomass-Derived Carbohydrates , 2005, Science.

[8]  B. Ahring,et al.  Inhibition of ethanol-producing yeast and bacteria by degradation products produced during pre-treatment of biomass , 2004, Applied Microbiology and Biotechnology.

[9]  Samir Kumar Khanal,et al.  Green processing of tropical banagrass into biofuel and biobased products: an innovative biorefinery approach. , 2011, Bioresource technology.

[10]  Vadim Kochergin,et al.  Evaluation of Target Efficiencies for Solid–Liquid Separation Steps in Biofuels Production , 2011, Applied biochemistry and biotechnology.

[11]  Harvey W Blanch,et al.  Bioprocessing for biofuels. , 2012, Current opinion in biotechnology.

[12]  Johan Börjesson,et al.  Enzymatic lignocellulose hydrolysis: Improved cellulase productivity by insoluble solids recycling , 2013, Biotechnology for Biofuels.

[13]  N. Mosier,et al.  Microscopic examination of changes of plant cell structure in corn stover due to hot water pretreatment and enzymatic hydrolysis , 2007, Biotechnology and bioengineering.

[14]  J. Wright.  Ethanol from biomass by enzymatic hydrolysis , 1988 .

[15]  A. Aden,et al.  An economic comparison of different fermentation configurations to convert corn stover to ethanol using Z. mobilis and Saccharomyces , 2009, Biotechnology progress.

[16]  A. Häkkinen,et al.  Effect of mixing on enzymatic hydrolysis of cardboard waste: saccharification yield and subsequent separation of the solid residue using a pressure filter. , 2012, Bioresource technology.

[17]  Mats Galbe,et al.  The influence of solid/liquid separation techniques on the sugar yield in two-step dilute acid hydrolysis of softwood followed by enzymatic hydrolysis , 2009, Biotechnology for biofuels.

[18]  Don W. Green,et al.  Perry's Chemical Engineers' Handbook , 2007 .

[19]  Min Zhang,et al.  Performance of a newly developed integrant of Zymomonasmobilis for ethanol production on corn stover hydrolysate , 2004, Biotechnology Letters.

[20]  R. Ruiz,et al.  Determination of Sugars, Byproducts, and Degradation Products in Liquid Fraction Process Samples , 2008 .

[21]  A. Häkkinen,et al.  Solid-liquid separation of hydrolysates obtained from enzymatic hydrolysis of cardboard waste , 2012 .