A low-cost solid–liquid separation process for enzymatically hydrolyzed corn stover slurries

Sievers, David A.; Lischeske, James J.; Biddy, Mary J.; Stickel, Jonathan J.

doi:10.1016/j.biortech.2015.03.087

A low-cost solid–liquid separation process for enzymatically hydrolyzed corn stover slurries

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · Bioresource Technology

DOI:https://doi.org/10.1016/j.biortech.2015.03.087· OSTI ID:1220661

Sievers, David A. ^[1]; Lischeske, James J. ^[1]; Biddy, Mary J. ^[1]; Stickel, Jonathan J. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States). National Bioenergy Center

Solid-liquid separation of intermediate process slurries is required in some process configurations for the conversion of lignocellulosic biomass to transportation fuels. Thermochemically pretreated and enzymatically hydrolyzed corn stover slurries have proven difficult to filter due to formation of very low permeability cakes that are rich in lignin. Treatment of two different slurries with polyelectrolyte flocculant was demonstrated to increase mean particle size and filterability. Filtration flux was greatly improved, and thus scaled filter unit capacity was increased approximately 40-fold compared with unflocculated slurry. Although additional costs were accrued using polyelectrolyte, techno-economic analysis revealed that the increase in filter capacity significantly reduced overall production costs. Fuel production cost at 95% sugar recovery was reduced by $1.35 US per gallon gasoline equivalent for dilute-acid pretreated and enzymatically hydrolyzed slurries and $3.40 for slurries produced using an additional alkaline de-acetylation preprocessing step that is even more difficult to natively filter.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; EE0005006

OSTI ID:: 1220661

Alternate ID(s):: OSTI ID: 1250317

Report Number(s):: NREL/JA--5100-63424

Journal Information:: Bioresource Technology, Journal Name: Bioresource Technology Journal Issue: C Vol. 187; ISSN 0960-8524

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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