Quantitative multiphase model for hydrothermal liquefaction of algal biomass

Li, Yalin; Leow, Shijie; Fedders, Anna C.; Sharma, Brajendra K.; Guest, Jeremy S.; Strathmann, Timothy J.

doi:10.1039/C6GC03294J

Quantitative multiphase model for hydrothermal liquefaction of algal biomass

Journal Article · Tue Jan 17 00:00:00 EST 2017 · Green Chemistry

DOI:https://doi.org/10.1039/C6GC03294J· OSTI ID:1350026

^[1]; Leow, Shijie ^[2]; Fedders, Anna C. ^[3]; Sharma, Brajendra K. ^[4]; Guest, Jeremy S. ^[3]; ^[5]

Colorado School of Mines, Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Univ. of Illinois at Urbana-Champaign, Champaign, IL (United States)
Colorado School of Mines, Golden, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)

Here, optimized incorporation of hydrothermal liquefaction (HTL, reaction in water at elevated temperature and pressure) within an integrated biorefinery requires accurate models to predict the quantity and quality of all HTL products. Existing models primarily focus on biocrude product yields with limited consideration for biocrude quality and aqueous, gas, and biochar co-products, and have not been validated with an extensive collection of feedstocks. In this study, HTL experiments (300 °C, 30 min) were conducted using 24 different batches of microalgae feedstocks with distinctive feedstock properties, which resulted in a wide range of biocrude (21.3–54.3 dry weight basis, dw%), aqueous (4.6–31.2 dw%), gas (7.1–35.6 dw%), and biochar (1.3–35.0 dw%) yields. Based on these results, a multiphase component additivity (MCA) model was introduced to predict yields and characteristics of the HTL biocrude product and aqueous, gas, and biochar co-products, with only feedstock biochemical (lipid, protein, carbohydrate, and ash) and elemental (C/H/N) composition as model inputs. Biochemical components were determined to distribute across biocrude product/HTL co-products as follows: lipids to biocrude; proteins to biocrude > aqueous > gas; carbohydrates to gas ≈ biochar > biocrude; and ash to aqueous > biochar. Modeled quality indicators included biocrude C/H/N contents, higher heating value (HHV), and energy recovery (ER); aqueous total organic carbon (TOC) and total nitrogen (TN) contents; and biochar carbon content. The model was validated with HTL data from the literature, the potential to expand the application of this modeling framework to include waste biosolids (e.g., wastewater sludge, manure) was explored, and future research needs for industrial application were identified. Ultimately, the MCA model represents a critical step towards the integration of cultivation models with downstream HTL and biorefinery operations to enable system-level optimization, valorization of co-product streams (e.g., through catalytic hydrothermal gasification and nutrient recovery), and the navigation of tradeoffs across the value chain.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1350026

Report Number(s):: NREL/JA--5100-68260

Journal Information:: Green Chemistry, Journal Name: Green Chemistry Journal Issue: 4 Vol. 19; ISSN GRCHFJ; ISSN 1463-9262

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Quantitative multiphase model for hydrothermal liquefaction of algal biomass

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