Article
Engineering, Chemical
Angga Pratama Herman, Jieqing Gan, Zongyan Zhou, Aibing Yu
Summary: This work presents a numerical study on particle mixing and scale-up of ribbon mixers with different sizes. The study found that as the mixer size increases, the mixing performance worsens. A correlation is proposed to predict the mixing rate based on the scale-up ratio and Froude number. It was observed that the top-bottom loading condition leads to faster mixing compared to the side-side and front-back loading conditions. Additionally, the total mixing time increases significantly with larger mixer sizes. The power consumption per unit mass follows a specific order among the four mixers. The study suggests that scale-up is necessary to save time and power consumption, as well as reduce operating costs.
Article
Engineering, Chemical
Jacek Stelmach, Czeslaw Kuncewicz, Tomas Jirout, Frantisek Rieger
Summary: This study used a PIV laser system to analyze the distribution of velocities and mixing power in a mixing tank with narrow and wide propeller impellers. The results showed that propeller impellers with wide blades were the most efficient in terms of energy consumption for achieving the desired mixing time. Additionally, the share of pumping capacity in the total secondary circulation was found to be almost double that of induced circulation.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Angus Shiue, Likuan Zhu, Chao-Li Wang, Jyh-Cheng Jeng, Graham Leggett
Summary: This study evaluated the power demand and mixing performance of three different coaxial mixers in laminar, transition, and turbulent flows. The results showed that the combination of a 4-pitched blade turbine and an anchor impeller provided the shortest mixing time given the same power consumption, making it the optimized combination among the three mixers.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Biotechnology & Applied Microbiology
Francesco Maluta, Alessandro Paglianti, Giuseppina Montante
Summary: The study reveals challenges in industrial production with multiple impeller fermenters, such as gas accumulation and reduction of power transfer, which hinder mass transfer. Through simulation methods, fluid dynamics features can be accurately predicted, and mass transfer limitations can be effectively overcome.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Kayte Sutherland, Leila Pakzad, Pedram Fatehi
Summary: The study found that mixing efficiency of a moving-baffle oscillatory baffled column is affected by oscillation conditions and changes in column scale, with small amplitudes combined with high frequencies being detrimental. Additionally, it was observed that scale-up of an MB-OBC is linearly dependent on column diameter, demonstrating predictability of hydrodynamic behavior during scale-up.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Ranjiangshang Ran, Quentin Brosseau, Brendan C. Blackwell, Boyang Qin, Rebecca L. Winter, Paulo E. Arratia
Summary: Bacterial activity affects fluid stretching and chaoticity, influencing the transport process; Bacterial activity hinders the transport of scalar variance across scales, increasing the size and lifetime of structures; At small scales, bacterial activity seems to enhance local mixing.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Biochemical Research Methods
Zihao Zheng, Aisha M. Mergaert, Irene M. Ong, Miriam A. Shelef, Michael A. Newton
Summary: Peptide microarrays are a powerful tool in immunoproteomics, but face challenges with high dimensionality and small sample sizes in experiments. The MixTwice tool addresses limitations in reproducibility and power of current methods by computing local FDR statistics and local false sign rate statistics, effectively estimating generative parameters and identifying non-null peptides. Numerical experiments demonstrate its accuracy and reproducibility in identifying meaningful peptide markers in different signal strengths.
Article
Chemistry, Multidisciplinary
Shuiqing Zhou, Qizhi Yang, Laifa Lu, Ding Xia, Weitao Zhang, Hao Yan
Summary: This study investigates the application of a sinusoidal sawtooth baffle in a stirred tank to enhance fluid mixing and reduce power consumption. Numerical simulation and PIV experiments were conducted to verify the effects of the modified baffle on flow mixing and power consumption. The results show that the sinusoidal sawtooth baffle reduces drag and shunting, enhances fluid turbulence and strain rate, improves particle distribution uniformity, and significantly lowers power consumption.
APPLIED SCIENCES-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Leda Maragoudaki, Konstantinos Atsonios, Dimitrios-Sotirios Kourkoumpas, Panagiotis Grammelis
Summary: This study investigates the production of 2G ethanol from Typha domingensis macrophyte and develops a complete bioethanol production system design. The results show that high plant efficiency and bioethanol production yield can be achieved using this feedstock if certain aspects are taken into consideration.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Jacek Stelmach, Czeslaw Kuncewicz, Lukasz Adrian, TomaS Jirout, Frantisek Rieger
Summary: This paper investigates the increase in mixing power during tank emptying with two axial impellers in operation. A significant increase in mixing power was observed when the liquid's free surface was above one of the impellers, exceeding the design power for a fully filled vessel. The study also explored the potential damage from high motor overload and provided correlation relationships for calculating power increase factors.
Article
Engineering, Chemical
Zhijian Zuo, Shuguang Gong, Guilan Xie
Summary: The study utilized the discrete element method (DEM) to simulate the particle mixing process in an intensive mixer and investigated the impact of structural and process parameters on mixing performance and power consumption. Results indicated that mixing performance and energy efficiency improve with decreasing impeller offset, while a decrease in filling level also enhances energy efficiency and mixing performance.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Jacek Stelmach, Czeslaw Kuncewicz, Szymon Szufa, Tomas Jirout, Frantisek Rieger
Summary: This study conducted an analysis of hydrodynamics in a tank with a 45 degrees and 60 degrees pitched blade turbine impeller operating while emptying the mixer, as well as the working scenarios of an axial agitator during axial pumping-down of water at different levels. Measurements with the PIV method confirmed the change in liquid pumping direction after the liquid level dropped below the critical value, with an increase in tangential velocity in the impeller area depending on the blade pitch angle and rotational frequency, leading to an increase in mixing power.
Article
Engineering, Chemical
Deyin Gu, Tao Yang, Longfei Xie
Summary: Fractal perforating impeller was introduced to improve the mixing performance of shear-thinning fluids with yield stress in a stirred reactor. Experimental analyses and numerical simulation showed that the fractal spaces in the impeller blades reduced power consumption and improved mixing efficiency. The fractal-3 perforating impeller achieved significant reductions in power consumption and mixing time compared with other impellers. The introduction of fractal spaces in the impeller blades also reduced the size of trailing vortices and promoted fluid mixing.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Antonio M. Borrero-Lopez, Concepcion Valencia, David Ibarra, Ignacio Ballesteros, Jose M. Franco
Summary: This study explores the potential of using lignin-enriched waste products from bioethanol production as thickeners for lubricating greases. The content of lignin and hydroxyl ratio were found to influence the NCO-functionalization and rheological response of the resulting oleogels, with barley straw residues exhibiting the highest storage modulus.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
Mandakini Behari, Ardhendu Mouli Mohanty, Debadutta Das
Summary: The study investigates the effectiveness of saponin extracted from Acacia concinna (Willd.) Dc. fruit as a dispersing agent in an iron ore-water slurry pipeline. The researchers vary saponin dosages, iron ore percentage, pH, temperature, and the shear stress-shear rate correlation to examine the rheological properties of the slurry. The interaction between the saponin and iron ore particles is explained by the hydrophobic and hydrophilic characteristics of both. The economic impact of the dispersant is assessed based on pressure drop and energy consumption for the proposed pipeline.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Leila M. A. Campos, Heloise O. M. A. Moura, Antonio J. G. Cruz, Samira M. N. Assumpcao, Luciene S. de Carvalho, Luiz A. M. Pontes
Summary: The study investigated the effects of SBC and commercial cellulose on enzymatic hydrolysis, and found that SBC had lower crystallinity and higher accessibility, resulting in higher glucose yield. The feedstock and cellulose treatment were found to be major factors influencing the saccharification efficiency, and using SBC achieved higher conversion.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Review
Biotechnology & Applied Microbiology
Eduardo Ximenes, Cristiane S. Farinas, Alberto C. Badino, Michael R. Ladisch
Summary: The progress in bioprocessing lignocellulose to fuels and value-added chemicals has created the potential for a low carbon-footprint economy, but the high cost of conversion currently results in higher ethanol prices compared to fossil fuels. Further development of biorefinery technology is expected to lower the cost of cellulosic ethanol production and increase the market penetration of bio-based products worldwide.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2021)
Article
Biotechnology & Applied Microbiology
Mateus N. Esperanca, Mariane M. Buffo, Caroline E. Mendes, Guilherme Y. Rodriguez, Rodrigo Bettega, Alberto C. Badino, Marcel O. Cerri
Summary: This study proposes a methodology to estimate the energy dissipation/circulation function (EDCF) for pneumatic bioreactors. The method combines computational fluid dynamics and pellet fragmentation assays. Experimental results in a 5 L pneumatic bioreactor validate the effectiveness of the proposed methodology.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Ivan I. K. Veloso, Kaio C. S. Rodrigues, Gustavo Batista, Antonio J. G. Cruz, Alberto C. Badino
Summary: This study aims to improve fed-batch ethanol fermentation under VHG/HCD conditions by modeling the process using appropriate kinetic models. The relationships between cell inhibition power parameter, cell yield coefficient, and fermentation conditions were established. The proposed model accurately predicted the dynamic behavior of the fermentations, as validated by experimental results.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2022)
Article
Engineering, Chemical
Mayara Santos, Kaio C. S. Rodrigues, Ivan I. K. Veloso, Alberto C. Badino, Antonio J. G. Cruz
Summary: The Fourier transform mid-infrared (FT-MIR) spectroscopy technique with multivariate calibration by the partial least-squares (PLS) regression method was used to monitor the ethanol molar fraction in the gas phase during ethanol fermentation in real time. The PLS model demonstrated excellent performance and predictive capacity, making it a reliable strategy for quantitative analysis and real-time monitoring.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Thalita J. Bondancia, Gustavo Batista, Jessica de Aguiar, Marcos Lorevice, Antonio J. G. Cruz, Jose M. Marconcini, Luiz H. C. Mattoso, Cristiane S. Farinas
Summary: The study evaluated the production of CNCs using organic and/or inorganic acid hydrolysis in a sugar cane biorefinery through TEA and LCA. The citric acid hydrolysis and recovery steps had significant environmental impacts, accounting for up to 58% of the global warming potential values for Cit-CNC and Cit-S-CNC. This highlights the importance of using TEA and LCA tools for decision making in future biorefineries when selecting nanocellulose isolation routes.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Agricultural Engineering
Luana Assis Serra, Rosineide Gomes da Silva Cruz, Diana M. . R. Gutierrez, Antonio Jose Gonsalves Cruz, Carlos Alberto Torres Canizares, Xueli Chen, Nathan Mosier, David Thompson, John Aston, James Dooley, Pankaj Sharma, Janice Lisboa De Marco, Joao Ricardo Moreira de Almeida, Kendra Erk, Eduardo Ximenes, Michael R. Ladisch
Summary: Laboratory assay demonstrated the potential for enzyme-based liquefaction at high solids loadings by rapidly assessing whether pellets have the potential, aiding in mixing and movement within biorefinery bioreactors.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Brenda G. Campos, Ivan I. K. Veloso, Marcelo P. A. Ribeiro, Alberto C. Badino, Antonio J. G. Cruz
Summary: This study evaluated extractive fermentation with CO2 stripping as a method to overcome temperature control and water demand issues in sugarcane ethanol production. A mathematical model was developed and simulations showed that extractive fermentation could significantly reduce cooling water consumption and increase total ethanol content.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Energy & Fuels
Cassia M. Oliveira, Antonio J. G. Cruz, Caliane B. B. Costa
Summary: The growing demand and prices of fuel have driven the advancement of technologies in improving the production process of biofuels. Energy integration in sugarcane biorefineries allows for better utilization of utilities and cost reduction, while increasing ethanol or electricity production. This study evaluates two case studies and finds that energy integration can result in surpluses of up to 8.8% in ethanol and 31.7% in electricity, and enhances environmental resource utilization and energy security.
BIOENERGY RESEARCH
(2023)
Article
Energy & Fuels
Ivan I. K. Veloso, Brenda G. Campos, Mateus N. Esperanca, Antonio J. G. Cruz, Alberto C. Badino
Summary: Low-temperature very high gravity ethanol fermentation can produce high ethanol content wines with reduced vinasse production. CO2 stripping can effectively cool the fermentation vat. Simulation and experiments showed that low-temperature very high gravity fermentation can significantly reduce the water volume required with the use of gas stripping.
BIOENERGY RESEARCH
(2023)
Article
Thermodynamics
Leandro V. Pavao, Lucas F. Santos, Cassia M. Oliveira, Antonio J. G. Cruz, Mauro A. S. S. Ravagnani, Caliane B. B. Costa
Summary: In sugarcane biorefineries, energy integration is crucial for determining the destination of by-products and ensuring the profitability of sales. The surplus sugarcane bagasse, a by-product of the sugar/ethanol production process, can be burned to produce steam for thermal demands or used for additional electricity production or second-generation ethanol production. This study proposes a flexible heat exchanger network design approach based on multiperiod synthesis, aiming to optimize the utilization of bagasse in different scenarios. The results demonstrate an increased maximum diversion of bagasse to 2G ethanol production with the new HEN design compared to the original design considered.
Review
Chemistry, Applied
Paula Squinca, Stanley Bilatto, Alberto C. Badino, Cristiane S. Farinas
Summary: There is a growing interest in using enzyme-mediated strategies to isolate cellulose nanomaterials for sustainable development, as they are more environmentally friendly. Recent research shows a significant increase in publications on cellulose nanomaterial production using enzymes, with hardwoods and agro-industrial residues as the most commonly used feedstocks. Commercial cellulase and endoglucanase preparations are the most frequently employed enzymes. However, there is currently no commercially available enzymatic preparation specifically designed for nanocellulose production. Nanocelluloses are commonly used in film preparation and as reinforcement agents. These findings provide valuable insights for future research and decision-making.
CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS
(2022)