Rheological Properties of Enzymatically Hydrolyzed Corn Stover Pretreated via Deacetylation and Mechanical Refining

Troxler, Jessie E.; Crain, Lauren A.; Stickel, Jonathan J.; Li, Yudong; LaForge, Frank; McMillan, James D.; Himmel, Michael E.; Samaniuk, Joseph R.

doi:10.1122/8.0000922

Rheological Properties of Enzymatically Hydrolyzed Corn Stover Pretreated via Deacetylation and Mechanical Refining

Journal Article · Mon Apr 14 04:00:00 EDT 2025 · Journal of Rheology

DOI:https://doi.org/10.1122/8.0000922· OSTI ID:2564388

Troxler, Jessie E.; Crain, Lauren A.; ; Li, Yudong; LaForge, Frank; ; Himmel, Michael E.; Samaniuk, Joseph R.

Lignocellulosic biomass is a feedstock for fuels and chemicals that does not compete with food resources and has less contaminants than refuse-derived biomass feedstocks. To convert lignocellulosics to biofuels or value-added products, multiple processing steps are typically necessary. One method of producing biofuels from lignocellulosic biomass utilizes a deacetylation and mechanical refining pretreatment and an enzymatic hydrolysis reaction to produce fermentable sugars from cellulose and hemicellulose. The rheological properties of biomass, such as yield stress and plastic viscosity, change during enzymatic hydrolysis and alter the energy requirements for pumping and mixing, an important consideration for the design of processing equipment. The dynamic changes in rheological properties that occur in a corn stover feedstock undergoing enzymatic hydrolysis are characterized in this work, and the influence on pressure losses in piping systems is estimated. Two rheometer geometries were fabricated with stereolithography 3D printing to reduce wall slip and sample ejection. The slurries have complex rheological behaviors that include shear-thinning behavior. Shear stress ramps were performed on samples at 20 and 50 degrees C using the custom geometries, and the Herschel-Bulkley model was fit to the data. The dynamic nature of the rheological properties is correlated with changes in the average fiber length at various extents of reaction, and the influence of solids concentration on the observed rheology and piping pressure losses is discussed.

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 2564388

Report Number(s):: NREL/JA-5100-94681; MainId:96463; UUID:a7963404-ca58-4801-bcf1-79e90b275de2; MainAdminId:76799

Journal Information:: Journal of Rheology, Journal Name: Journal of Rheology Journal Issue: 3 Vol. 69

Country of Publication:: United States

Language:: English

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