Thermal pretreatment of a high lignin SSF digester residue to increase its softening point

Howe, Daniel T.; Garcı̀a-Pèrez, Manuel; Taasevigen, Danny J.; Rainbolt, James E.; Albrecht, Karl; Li, Hui; Wei, Liqing; McDonald, Armando G.; Wolcott, Michael P.

doi:10.1016/j.jaap.2016.03.012

Cited by 9 publications

(8 citation statements)

References 35 publications

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“…30 The sticky melt forms agglomerates (with bed material such as sand) and ultimately causes blockages inside the pyrolysis reactor. [31][32][33] Finally, in early stages of lignin pyrolysis, radical intermediates are formed, 24,[34][35][36] which undergo repolymerization, leading to the formation of larger molecular-weight compounds and solid char. 37,38 To facilitate lignin feeding, reactors were modified 28 and 29 slug injection was performed by pneumatic transport.…”

Section: Introductionmentioning

confidence: 99%

Improving fast pyrolysis of lignin using three additives with different modes of action

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Improving fast pyrolysis of lignin using three additives with different modes of action

et al. 2020

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“…As reported in a previous study [25], the thermal pretreatment of the SSF residue results in weight loss attributed primarily to the evolution of volatiles composed primarily of acetic acid, methanol, CO, CO 2 , and furan derivatives [28]. When processed in the auger reactor at 300°C and a residence time of 22.5 min, the SSF residue exhibited a weight loss equal to 21.4%.…”

Section: Thermal Pretreatmentmentioning

confidence: 79%

“…The unpelletized SSF residue was thermally pretreated in a continuous feed auger reactor. A processing temperature of 300°C and residence time of 22.5 min was chosen based on previous work [25]. Calibration of the residence time was accomplished by filling the void fraction of the reactor with the same unpelletized SSF residue as that to be treated, injecting a spike of material, and recording the time until the material was seen exiting the reactor heating zone.…”

Section: Thermal Pretreatmentmentioning

confidence: 99%

“…One potential method of overcoming the drawbacks to the use of high lignin materials is to employ a thermal pretreatment (TPT) step to render the feedstock less susceptible to premature melting by increasing the softening point of the material [25]. TPT, also known as torrefaction, slow pyrolysis, mild pyrolysis, roasting, and deep drying [26], involves heating the feedstock in an inert atmosphere at temperatures typically ranging from 200°C to 300°C [27].…”

Section: Introductionmentioning

confidence: 99%

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Steam gasification of a thermally pretreated high lignin corn stover simultaneous saccharification and fermentation digester residue

Howe

Taasevigen

Garcı̀a-Pèrez

et al. 2017

Energy

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Efficient conversion of all components in lignocellulosic biomass is essential to realizing economic feasibility of biorefineries. However, lignin cannot be fermented using biochemical routes. Furthermore, high lignin and high ash residues from simultaneous saccharification and fermentation (SSF) is difficult to thermochemically process due to feed line plugging and bed agglomeration. In this study a corn stover SSF digester residue was thermally pretreated at 300°C for 22.5 minutes and gasified in a fluidized bed gasifier to study the effect of thermal pretreatment on its processing behavior. Untreated, pelletized SSF residue was gasified at the same conditions to establish the baseline processing behavior. Results indicate the thermal pretreatment process removes a substantial portion of the polar and non-polar extractives, with a resultant increase in the concentration of lignin, cellulose, and ash. Feed line plugging was not observed, although bed agglomeration occurred at similar rates for both feedstocks, suggesting that overall ash content is the most important factor affecting bed agglomeration. Benzene, phenol, and polyaromatic hydrocarbons in the tar were present at higher concentrations in the treated material, with higher tar loading in the product gas. Total product gas generation is lower for the treated material, although overall gas composition does not change.

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“…Cellulose, hemicellulose, and lignin are the major components of softwood lignocellulosic material. Besides carbohydrates, the characteristics and applications of lignin have been investigated in many studies (Howe et al, 2016;Zhou et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Modeling the production of sugar and byproducts from acid bisulfite pretreatment and enzymatic hydrolysis of Douglas-fir

Wang

Wolcott

2017

Bioresource Technology

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The aim of this work was to investigate the kinetics of multiple chemicals in acid bisulfite pretreatment and the relationship between total sugar yields and pretreatment factors (temperature and time). The results showed Saeman model accurately fitted the pretreatment process. According to this kinetic model, a maximum hemicellulose hydrolysis yield was achieved at a treatment time of 75min with a temperature of 145°C. Meantime, the concentrations of acetic acid, hydroxymethylfurfural (HMF), and furfural were 1.54, 0.60, and 1.15gL, respectively. Also, a Lorentzian function described the relationship between total sugar yield and pretreatment factors: temperature and time. The regression parameters from this mathematical fitting have accurately reflected the maximum total sugar yield and the optimal treatment conditions were determined to be 145°C and 110min.

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Thermal pretreatment of a high lignin SSF digester residue to increase its softening point

Cited by 9 publications

References 35 publications

Improving fast pyrolysis of lignin using three additives with different modes of action

Improving fast pyrolysis of lignin using three additives with different modes of action

Steam gasification of a thermally pretreated high lignin corn stover simultaneous saccharification and fermentation digester residue

Modeling the production of sugar and byproducts from acid bisulfite pretreatment and enzymatic hydrolysis of Douglas-fir

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