Sugar, hydrochar and bio-oil production by sequential hydrothermal processing of corn cob

Martins-Vieira, João Cláudio; Lachos‐Perez, Daniel; Draszewski, Crisleine P.; Celante, Dian; Castilhos, Fernanda de

doi:10.1016/j.supflu.2023.105838

Cited by 25 publications

(5 citation statements)

References 76 publications

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“…For instance, wheat straw, rice straw, corn stalk, rape stalk, and CC have different compositions. The amounts of lignin, cellulose, and hemicellulose in these crops significantly differ, which is likely due to variations in sampling, climatic, and cultivation conditions [23]. Among these raw materials, CC had a hemicellulose content of 32.50% and a cellulose content of 36.92%, which is similar to previous findings in the literature [43,44].…”

Section: Selection Of Raw Materialssupporting

confidence: 77%

“…The hemicellulose conversion rate and RSY peaked at 78.48% and 59.12%, respectively, whereas a further decrease in the solid-to-liquid ratio resulted in a decrease in CC conversion rate and RSY. Under high-temperature conditions, hot water, the acetyl group of acetic acid in the hemicellulose molecule, and H + played a catalytic role, resulting in a weakly acidic degradation solution [23]. When the solid-to-liquid ratio was high and water content was low, the fluidity of the reaction system and the mass transfer effect were poor, decreasing the available H + ions for the reaction and leading to a low RSY and hemicellulose conversion rate.…”

Section: Effects Of Cac Solid-to-liquid Ratio On the Pre-hydro-depoly...mentioning

confidence: 99%

“…The polysaccharides content of CC makes it a potential source of available sugars, and its low ash content is advantageous for conversion processes [20]. In the last decade, CC conversion has been investigated to obtain different products that can be more efficiently used as bio-adsorbents, thermal insulation materials, polymer composites, bioethanol and bioenergy chemicals, and other biomaterials for additional economic and ecological benefits [23][24][25]. However, lignin in CC's outer layer tightly intertwines and wraps around cellulose and hemicellulose, forming a dense, incorrigible, cross-linked threedimensional (3D) structure known as lignocellulose.…”

Section: Introductionmentioning

confidence: 99%

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Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob

Yang

Zhu

et al. 2023

Sustainability

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Hydro-depolymerization is a novel method for converting agricultural waste into eco-friendly and promising products. Due to the complex structure and composition of corn cob (CC), a three-step process was developed, which involved pre-hydro-depolymerization of hemicellulose, alkaline extraction of lignin, and hydro-depolymerization of cellulose. The pre-hydro-depolymerization step was at first optimized to produce five-carbon and six-carbon sugars, achieving a maximum hemicellulose conversion rate of 78.48 ± 3.92%, and reducing a sugar yield of 59.12 ± 2.95%. Alkaline treatment achieved a maximum lignin extraction efficiency of 73.76 ± 3.68%. After hemicellulose removal and delignification, the cellulose conversion rate increased to 36.63% and further increased to 76.97% after five cycles. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were performed to confirm physical and chemical changes in CC residues. The integrated process of hydro-depolymerization and alkaline treatment enables the complete exploitation of cellulose, hemicellulose, and lignin, and thus holds great potential for application in the agriculture industry.

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Section: Selection Of Raw Materialssupporting

confidence: 77%

Section: Effects Of Cac Solid-to-liquid Ratio On the Pre-hydro-depoly...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob

Yang

Zhu

et al. 2023

Sustainability

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“…Dry feedstock is usually processed via pyrolysis, while hydrothermal processing utilizes wet biomass. Subcritical or supercritical water facilitates biomass conversion during hydrothermal liquefaction and carbonization processes [8,9]. There are several techniques that can be utilized to obtain high value products from microalgal biomass.…”

Section: Introductionmentioning

confidence: 99%

Algae: Nature’s Renewable Resource for Fuels and Chemicals

Chakraborty,

Dunford

2024

Biomass

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Microalgae-based renewable energy, industrial chemicals, and food have received great attention during the last decade. This review article highlights the versatility of algal biomass as a feedstock for producing various commodities and high-value products, including aromatic hydrocarbons and lipids within biorefinery systems. Lipid content and the composition of algal biomass cultivated in various media, specifically in wastewater streams generated at agricultural and industrial production facilities, are reviewed. Technical and chemical aspects of algal biomass conversion via thermochemical techniques including pyrolysis, hydrothermal liquefaction, and hydrothermal carbonization are discussed. The properties of the final products are reviewed based on the conversion process employed. Studies published within the last 5 years are reviewed. The importance of further research on inexpensive and more effective catalysts and the development of downstream processes to upgrade crude products obtained from thermal conversion processes is emphasized. This review concludes with an in-depth discussion of the opportunities and challenges involved in algal biomass-based bioproduct manufacturing and commercialization.

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“…However, for each ton of maize harvested, approximately 1.96 tons of waste are generated, including stalk, leaves, cob, and straw. These residues are subject to treatment and can be used for alternatives such as: composting, energy generation and to obtain activated carbon (Martins-Vieira et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Production and application of activated carbon obtained from the thermochemical degradation of corn cob

Pedroza,

Machado,

Silva

et al. 2023

JART

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The present work aims to perform the thermal degradation of corn cob for the production of activated carbon, which is used in a column adsorption system for the dechlorination of supply water. The biomass under study and the product generated by pyrolysis in a fixed bed reactor were analyzed using classical methods (moisture, volatile materials, ash and fixed carbon, lignin, cellulose, hemicellulose and apparent density) and instrumental methods (thermogravimetry and CNH). In the pyrolysis process, the following parameters were studied: temperature (360 to 640 oC) and heating rate (13 to 27 oC/min). The reaction time was 30 minutes. The dechlorination test using the activated carbon obtained in this research was carried out in an adsorption column in continuous flow at an average flow rate of 6 mL/min. The iodine number of the adsorbent produced in this research was calculated. The results obtained showed that the carbon content (44%) and the lignin content (28%) point to the use of residual biomass studied in this research for the production of activated carbon via the thermal route. The highest activated carbon yield was 71.12% at a temperature of 360 °C with a heating rate of 20 °C/min. While the minimum yield was 21.6% with a temperature of 600 °C and a heating rate of 25 °C/min. The iodine number of the activated carbon produced at 640 oC was 820 mgI2/g. In the adsorption test, the following coefficients from the Thomas model were obtained: kTH = 0.0093 mL/mg.min and qo = 98 mg/g, when a liquid flow equal to 9.9 mL/min was used. The adsorption capacity of coal is related to the flow rate of the dye solution, being noticed that the higher the liquid flow rate in the column, the higher the adsorbate mass transfer coefficient.

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Sugar, hydrochar and bio-oil production by sequential hydrothermal processing of corn cob

Cited by 25 publications

References 76 publications

Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob

Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob

Algae: Nature’s Renewable Resource for Fuels and Chemicals

Production and application of activated carbon obtained from the thermochemical degradation of corn cob

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