Performance assessment of dilute-acid leaching to improve corn stover quality for thermochemical conversion

Aston, John E.; Thompson, David N.; Westover, Tyler L.

doi:10.1016/j.fuel.2016.08.056

Title: Performance assessment of dilute-acid leaching to improve corn stover quality for thermochemical conversion

Journal Article · Tue Aug 30 00:00:00 EDT 2016 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2016.08.056· OSTI ID:1363914

Aston, John E. ^[1]; Thompson, David N. ^[1]; Westover, Tyler L. ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)

Lignocellulosic biomass is a sustainable energy source that can help meet the increasing demand for biofuels in the United States. However, the quality and availability of such feedstocks greatly affects their suitability for downstream conversion. This work reports the effects of dilute-acid leaching at various solid loadings, temperatures and acid loadings on the quality of a traditional biochemical feedstock, corn stover, as a potential feedstock for thermochemical conversions. At 5 wt% solids, dilute-acid leaching was observed to effectively remove 97.3% of the alkali metals and alkaline earth metals that can negatively affect degradation pathways during pyrolysis and result in greater yield of non-condensable gases. In addition, up to 98.4% of the chlorine and 88.8% of the phosphorus, which can cause equipment corrosion and foul upgrading catalysts, respectively, were removed. At 25°C in the absence of acid, only 6.8% of the alkali metals and alkaline earth metals were removed; however 88.0% of chloride was still removed. The ratio of alkaline/acidic ash species has been suggested to proportionately relate to slagging in biopower applications. The initial alkali/acid ratio of the ash species present in the untreated corn stover was 0.38 (significant slagging risk). At 5 wt% solids, this ratio was decreased to 0.18 (moderate slagging risk) at 0 wt% acid and 90°C, and was decreased to 0.07, 0.08 and 0.06 at 0.5 wt% acid at 25°C, 50°C and 90°C, respectively (little or no slagging risk). Increasing the acid loading to 1.0% only slightly decreased the measured alkali/acid ratio of remaining ash species. Lastly, the results presented here show that a water wash or dilute-acid preprocessing step can improve corn stover quality for pyrolysis, hydrothermal liquefaction and biopower.

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Research Organization:: Idaho National Lab. (INL), Idaho Falls, ID (United States)

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

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1363914

Alternate ID(s):: OSTI ID: 1399041

Report Number(s):: INL/JOU-16-37778; PII: S0016236116307943

Journal Information:: Fuel, Vol. 186, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 29 works

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