Article
Energy & Fuels
Ibnu Maulana Hidayatullah, Frederick Soetandar, Pingkan Vanessa Sudiyasa, Patrick Cognet, Heri Hermansyah
Summary: Ion exchange resins and immobilized lipase are used as catalysts for biodiesel synthesis. Resins aid in the separation process and can be regenerated, reducing the need for catalysts. Immobilized lipase catalyzes transesterification with a lower alcohol-to-oil ratio, minimizing side reactions. The study investigates process parameters and found optimal conditions for different resins, achieving biodiesel yields of 94.06% (Lewatit), 90.00% (Amberlite), and 73.88% (Diaion). The reactivated Lewatit resin maintains a yield of over 80% after three regeneration cycles. Lower flowrates in enzymatic synthesis result in higher biodiesel production, reaching 71.1%. Immobilized lipase can be used up to three times without significant loss in yield.
Article
Environmental Sciences
Ponnuswamy Vijayaraghavan, A. Amala Lourthuraj, Mariadhas Valan Arasu, Naif AbdullahAl-Dhabi, Balasubramani Ravindran, Soon WoongChang
Summary: This study focused on screening antibiotics-degrading bacteria from enriched sewage sludge and analyzing their degradation efficiency and optimal conditions in a moving bed bioreactor for the removal of antibiotics and nutrients from wastewater. Selected bacterial strains showed high antibiotic tolerance and efficient degradation rates, indicating the potential of indigenous bacterial communities for survival in challenging environments. The moving bed bioreactor proved to be useful for the simultaneous removal of nutrients and antibiotics from wastewater.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Chemical
Jing Ma, Wei Wei, Guotong Qin, Lei Jiang, Ngie Hing Wong, Jaka Sunarso, Shaomin Liu
Summary: This study presents an efficient reactor design that integrates an electrocatalytic packed-bed reactor with a membrane for nitrate removal. The reactor system shows excellent nitrate removal and nitrogen selectivity, highlighting the potential for large-scale nitrate remediation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Energy & Fuels
Kemal F. Hastadi, Tejas Bhatelia, Jim Patel, Paul A. Webley, Vishnu K. Pareek, Milinkumar T. Shah
Summary: This study introduces a novel forward mixed multistage packed bed reactor (FMMPBR) for methanol synthesis. The FMMPBR is divided into multiple stages with flow diverters to optimize reactant concentration and catalyst amount. Through simulation and optimization, the FMMPBR shows higher carbon conversion and lower catalyst requirement compared to the standard tubular reactor. Additionally, it achieves reduced temperature deviation and higher production rate.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Chemistry, Applied
Lucas Dal Magro, Joao Pedro S. Pessoa, Manuela P. Klein, Roberto Fernandez-Lafuente, Rafael C. Rodrigues
Summary: This study immobilized a commercial enzyme cocktail for fruit juice clarification on chitosan beads and found that despite low activity recovery after immobilization, the stability of the immobilized enzyme was greater than that of the free enzyme. The enzyme retained higher activity levels under extreme conditions, and the fluidized-bed reactor showed better juice clarification capacity compared to the packed-bed reactor.
Article
Engineering, Environmental
Amadu T. Bah, Ziyi Shen, Junna Yan, Feihu Li, Teik Thye Lim
Summary: By combining batch adsorption enrichment with struvite crystallization, we prepared ternary layered double hydroxides (LDHs) with P-preferring elements and evaluated their performance in recovering P from water. The LDHs demonstrated high P adsorption capacities and the recycling tests showed good enrichment for P. Moreover, more than 96% of phosphorus in the P-enriched eluates can be efficiently reclaimed via struvite crystallization. These findings demonstrate the feasibility of combining adsorption enrichment with struvite crystallization for P recovery.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Dayanni D. Bhagwandin, John H. Dunlap, Ly D. Tran, Alexander Reidell, Drake Austin, Amelia A. Putnam-Neeb, Morgan Loveday, Rahul Rao, Luke A. Baldwin, Nicholas R. Glavin
Summary: Flow systems allow for in-line synthesis and processing of organic materials, offering advantages in high-throughput and scalability. In this study, a highly crystalline TAPB-OHPDA covalent organic framework (COF) was directly crystallized under continuous flow conditions in just 30 minutes. BET surface analysis showed that high surface areas above 1700 m2 g-1 can be achieved in 2 hours, resulting in a processing time 36 times faster than most solvothermal methods. The findings provide foundational knowledge for COF syntheses under packed-bed flow conditions and demonstrate an opportunity to accelerate the formation and processing of highly crystalline COF materials.
Article
Chemistry, Physical
Rebecca Hollenbach, Delphine Muller, Andre Delavault, Christoph Syldatk
Summary: This study presents a novel concept of continuous enzymatic glycolipid production catalyzed by Novozyme 435®, using a biphasic aqueous-organic system for simultaneous solubilization of sugars and fatty acids. Productivity in the continuous process was higher compared to a batch one, with space-time yields of up to 1228 ± 65 mu mol/L/h.
Article
Engineering, Chemical
Tiprawee Tongtummachat, Nattee Akkarawatkhoosith, Attasak Jaree
Summary: This study presents a novel continuous production method of 5-HMF from sucrose using a fixed-bed reactor packed with dual ion-exchange resins as catalyst in a biphasic system. The optimal conditions and catalyst-bed configuration were determined to achieve a high yield of 5-HMF.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Thermodynamics
Waqar Ahmad, Leteng Lin, Michael Strand
Summary: This study investigated the tar conversion using partial combustion technique, finding that temperature had insignificant effect on benzene conversion while an air fuel ratio of 0.3 resulted in higher conversion rates. Additionally, H-2 and CH4 had substantial inverse effects on benzene conversion.
Article
Engineering, Chemical
Piu Chawdhury, Sarita Bhanudas Rawool, M. Umamaheswara Rao, Ch. Subrahmanyam
Summary: A dielectric barrier discharge reactor was used as a non-thermal plasma source for nonoxidative conversion of methane at ambient condition. By introducing dielectric materials and catalyst support materials, the non-catalytic reaction mechanism was investigated. The results showed that the non-catalytic mode could activate the C-H bond to produce H2 and light hydrocarbons without oxidant or thermal energy.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
J. A. Andersen, J. M. Christensen, M. ostberg, A. Bogaerts, A. D. Jensen
Summary: This study investigated the plasma-catalytic ammonia decomposition for producing hydrogen using a packed-bed dielectric barrier discharge reactor. The introduction of dielectric materials with certain dielectric constants improved the ammonia decomposition, with MgAl2O4 showing the highest conversion rate. Further studies are needed to optimize the efficiency of this technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Martin B. Ostergaard, Azeem B. Strunck, Mads K. Jorgensen, Vittorio Boffa
Summary: A new method for thermocatalytic degradation of dispersed oil using a thermocatalyst, Sr0.85Ce0.15FeO3 perovskite, is proposed, which utilizes the thermal energy in produced water. Experimental results show that higher perovskite concentrations lead to faster removal of oil, with initial removal being adsorption to the perovskite surface followed by catalytic degradation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
M. Umamaheswara Rao, K. V. S. S. Bhargavi, Giridhar Madras, Ch. Subrahmanyam
Summary: A coaxial dielectric barrier discharge (DBD) reactor was used for catalytic non-thermal plasma conversion of CO2. The role of basic oxides in activating weakly acidic CO2 was investigated by synthesizing MO/gamma-Al2O3 (M = Mg, Ca, Sr, and Ba) catalysts and integrating them with the DBD reactor. The integration of basic metal oxides with the non-thermal plasma reactor resulted in a higher CO2 conversion. The best conversion was achieved with SrO loaded gamma-Al2O3 at a power of 1.8 W, with a CO2 conversion of 12% and energy efficiency of 1.46 mmol kJ-1.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Tiziano Delise, Salvatore Sau, Anna Chiara Tizzoni, Annarita Spadoni, Natale Corsaro, Raffaele Liberatore, Tania Morabito, Emiliana Mansi
Summary: Chemical systems for thermal energy storage show promise in addressing solar irradiation fluctuation issues, and this study focused on simulating a configuration using an indirect-packed bed heat exchanger. Despite limitations in heat exchange efficiency, the results demonstrated a good storage efficiency of about 0.7.