Article
Thermodynamics
Ali Mohammad Rahmani, Vinay Kumar Tyagi, A. A. Kazmi, Chandra Shekhar P. Ojha
Summary: Bio-methanation of agro-residue can meet energy demands and reduce environmental pollution. Hydrolysis is the limiting step in anaerobic digestion of agro-waste, and pretreatment is needed to improve methane yield. Hydrothermal and thermal-acid pretreatments can enhance solubilization of wheat straw and increase methane production, but thermal-acid pretreatment can generate compounds that negatively affect methane production.
Article
Chemistry, Physical
Zhengjie Liu, Kiran Khurshid, Marleny D. A. Saldana
Summary: This study demonstrated that barley straw treated with subcritical water and pressurized aqueous ethanol can effectively extract monosaccharides, reduce the formation of inhibitors by increasing ethanol concentration, and increase the antioxidant activity of the products.
JOURNAL OF SUPERCRITICAL FLUIDS
(2023)
Article
Biochemistry & Molecular Biology
Zahra Azzouz, Azzeddine Bettache, Nawel Boucherba, Alicia Prieto, Maria Jesus Martinez, Said Benallaoua, Laura Isabel de Eugenio
Summary: Plant biomass is a major source of renewable carbon, with hemicellulose being the second most abundant polysaccharide on Earth after cellulose. This study focused on the production of hemicellulases by a new strain of Aspergillus niger, resulting in significantly increased enzyme yield and high stability under various conditions, making it suitable for wheat straw xylan hydrolysis and applications in food technology.
Article
Environmental Sciences
Jianhong Sun, Yuanfang Deng, Shaohua Li, Wenyong Xu, Guoquan Liu
Summary: This research investigated the enhanced efficiency of enzymatic hydrolysis of wheat straw through freeze-thaw pretreatment and analyzed the changes in physicochemical structure after pretreatment. The study found that cellulose and hemicellulose hydrolysis efficiency was improved, with hemicellulose being more susceptible to pretreatment. The highest hydrolysis efficiency for cellulose and hemicellulose was 57.06% and 70.66%, respectively, achieved at -80℃ for 24 hours and -10℃ for 24 hours, which were 2.23 and 3.13 times higher than the control levels, respectively. The study also observed cracks and holes in the pretreated samples, indicating structural changes. Fourier transform infrared spectroscopy and X-ray diffraction analysis revealed disruptions in the crystalline and amorphous regions and hydrogen bonds. This study provides a physical pretreatment method for enhancing the enzymatic hydrolysis efficiency of wheat straw.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Hui-Long Wei, Xi-Bao Zhang, Zheng-Hong Luo
Summary: In this study, the synthesis of 5-oxohexanenitrile through the addition of acetone to acrylonitrile was investigated using a microreactor. A semiempirical kinetic model was developed and validated, and its effects on reaction conditions and reactor parameters were studied for the design and optimization of industrial tubular reactors.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Suvi Kyyro, Michael Altgen, Lauri Rautkari
Summary: The size of wood affects the efficiency of hot water extraction, with smaller samples resulting in greater mass loss due to difficulties in diffusion and mass transfer. Additionally, the size of wood also influences the amount of dissolved compounds in the extraction liquid.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Agricultural Engineering
Jiayun Xu, Zhiyong Shao, Ying Li, Lin Dai, Zhaojiang Wang, Chuanling Si
Summary: A green and efficient flow-through reactor was designed for biomass fractionation, achieving rapid fractionation of wheat straw with high yields of lignin and sugars without noticeable degradation of hemicelluloses. The carefully preserved inter-unit linkages in lignin fractionation suggest promising practical applications for competitive products.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Agricultural Engineering
Andrea Rodriguez-Sanz, Clara Fucinos, Ana M. Torrado, Maria L. Rua
Summary: This study presents a mild method for the efficient extraction of wheat straw hemicellulose fraction using three commercial endo-xylanase cocktails. The use of alkali treatment and enzymatic hydrolysis enabled the successful extraction of a high proportion of hemicellulose, and the catalytic properties of the enzymes and the role of accessory enzymes were discussed.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Materials Science, Paper & Wood
Chao Liu, Rui Zhang, Jingjie Yu, Jing Chang, Wenjuan Zhang
Summary: The effects of a two-stage pretreatment consisting of tepid water and FeCl3 on hemicellulose hydrolysis were investigated. The results showed that the two-stage pretreatment significantly decreased the activation energy and optimal reaction time of hemicellulose hydrolysis, while increasing the xylose content and reducing the catalyst dosage. This study provides an efficient pretreatment process for hemicellulose hydrolysis.
Article
Chemistry, Multidisciplinary
Nidhi Aggarwal, Priyanka Pal, Neeraj Sharma, Shunmugavel Saravanamurugan
Summary: This study presents two different two-step approaches for the efficient removal of silica from rice straw and separation of its major components, resulting in the obtainment of highly pure cellulose.
Article
Engineering, Environmental
Alessandro Stagni, Suphaporn Arunthanayothin, Mathilde Dehue, Olivier Herbinet, Frederique Battin-Leclerc, Pierre Brequigny, Christine Mounaim-Rousselle, Tiziano Faravelli
Summary: Understanding the chemistry of ammonia/hydrogen mixtures oxidation is vital for their versatile application in propulsion systems and power generation. This study investigated the oxidation of such blends under low- and intermediate-temperature conditions through experimental and kinetic-modeling approaches. The experimental campaign measured the mole fraction of fuels, oxidizer, and final products, while a comprehensive kinetic model was used to interpret the results and expand the analysis to literature data. The role of HO2 in regulating fuel conversion and autoignition at low temperature was confirmed, and the nitrogen fate was primarily controlled by NHx + NO propagation and termination channels.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Yuanjie Gu, Jianming Guo, Ali Nawaz, Ikram ul Haq, Xin Zhou, Yong Xu
Summary: Efficient enzymatic hydrolysis is crucial for cellulosic biochemical production from lignocellulosic materials, which is influenced by the complex lignin-cellulose-hemicellulose network. Acid pretreatment is preferred for herbaceous feedstocks, and an experimental study showed that classic dilute sulfuric acid pretreatment can effectively remove hemicellulose. Mathematical correlations were established between hemicellulose removal, residual cellulose enzymatic hydrolysis, crystallinity index, and enzyme accessibility of the pretreated materials, comparing linear and nonlinear kinetic models to establish the relationship through logistic equations and Allosteric sigmoidal models.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Theresa Menzel, Peter Neubauer, Stefan Junne
Summary: This study investigated the effect of bioaugmentation on the hydrolysis and acidogenesis efficiency of bedding straw mixed with maize silage. The results showed that bioaugmentation increased the hydrolysis rate and acid production, but had no significant effect on mixtures with a high straw content. Bioaugmentation also had a positive impact on the physiological state of the cultures and this effect was maintained for a certain period of time during continuous fermentation. These findings provide a basis for optimizing the use of bioaugmented microorganisms and the hydrolysis of biogenic material in terms of sustainable process performance and costs.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Engineering, Environmental
Maximilien Gibier, Mohammad Sadeghisadeghabad, Pierre Girods, Andre Zoulalian, Yann Rogaume
Summary: This study investigated the hydrolysis process of wood waste from the French furniture industry. A novel method using an online FTIR spectrometer and a dilution system was successfully applied to measure the emission of formaldehyde and ammonia. The impact of operational conditions on the release of formaldehyde and ammonia was discussed. A mathematical model was also introduced to predict the behavior of formaldehyde and ammonia emissions during wood waste hydrolysis.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Agricultural Engineering
Itziar A. Escanciano, Victoria E. Santos, Angeles Blanco, Miguel Ladero
Summary: In this study, succinic acid was anaerobically produced from potato waste and glucose using Actinobacillus succinogenes. A simple kinetic model was developed to accurately predict the evolution of succinic acid, substrate, by-products, and biomass. Experiments comparing fermentation performance between potato waste and pure glucose showed that using the hydrolysate from potato waste resulted in a 37% improvement in succinic acid yield. The proposed kinetic model was successfully applied to the fermentation data, making it a valuable tool for future techno-economic analysis of the bioprocess.
INDUSTRIAL CROPS AND PRODUCTS
(2023)