Article
Energy & Fuels
Liang Wang, Yifei Wang
Summary: By using numerical calculation and simulation to study the effects of different fin thickness, fin space, and the number of ducts on the heat storage and release process of paraffin, it is found that optimized parameters can improve the performance of the paraffin regenerator, showing the significant role of heat transfer between air and paraffin. The best combination regenerator can maintain indoor heating for eight hours with its melting degree and released heat.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Sedi Helsper, Matthew W. Liberatore
Summary: Increasing oil production from cold environments has led to flow assurance issues caused by wax deposition and hydrate formation. This study investigates the high-pressure flow properties of waxy oils and finds that wax concentration has a larger effect on wax appearance temperature than pressure. Understanding waxy oil rheology under methane-saturated, high-pressure conditions is crucial for addressing flow assurance challenges in cold environments.
Article
Energy & Fuels
Mohammad Monzavi, Zhaohui Chen, Amin Solouki, Jamal Chaouki
Summary: A unique catalyst, SiC foam @HZSM-5, was designed for the microwave-assisted pyrolysis process of waste hydrocarbons. The designed process showed high yield and quality of liquid oil products, with a considerable amount of olefins detected in the collected gases.
Article
Energy & Fuels
Muh Kurniawan, Jens Norrman, Kristofer Paso
Summary: The mechanisms of action for pour point depressants (PPD) include solubilization, morphology alteration, and steric/entropic repulsion. London van der Waals attractions between longer wax components effectively diminish PPD solubilization activity. Higher molecular weight PPD polymers preferentially partition to solid phases, while lower molecular weight polymers remain soluble in the liquid phase.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Jun Ding, He Ma, Xiao Xiao, Qingwei Li, Kai Liu, Xinping Zhang
Summary: A flexible torsional actuator based on an MXene-CNT-PW film has been proposed, delivering excellent actuation performance and potentially serving as a noncontact sensor, rotary motor, and grabbing tool in the soft robot system.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Energy & Fuels
Nguyen Van Thang, Pham Thanh Vinh, Mikhail Konstantinovich Rogachev, Grigory Yurievich Korobov, Dmitry Viktorovich Parfenov, Aleksei Olegovich Zhurkevich, Shamil Rasikhovich Islamov
Summary: The gas lift method is an artificial lift method that uses compressed gas to lift reservoir fluid to the surface. The formation of wax deposits is a common problem in oil and gas fields, including those in Vietnam. Wax deposits negatively impact well operation and field development, leading to reduced productivity and increased well downtime. In order to ensure stable and efficient production, regular dewaxing operations are necessary. This study developed a comprehensive method to determine the dewaxing interval period for gas-lift wells and also proposed a mathematical model to predict wax thickness over time. The model was applied to an oil well in Vietnam and showed good accuracy in comparison with actual field data.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Aziz Alhejaili, Elijah Bell, Nagu Daraboina
Summary: Wax deposition in subsea crude oil pipelines is a significant operational issue in oil production, and the environmental and operational conditions play a crucial role in determining the amount and characteristics of the wax deposition. This study investigated the impact of deposition time, flow rate, and pipe wall temperature on wax deposition characteristics using a specially designed flow loop and model oil. The results showed that increasing deposition time and decreasing flow rate led to thicker deposits and higher wax content, wax appearance temperature (WAT), wax disappearance temperature (WDT), and viscosity. Computational fluid dynamics (CFD) simulations were also used to analyze the heat transfer between the oil and the cold environment, showing that lower flow rates promoted more heat transfer and increased deposition thickness.
Article
Entomology
Magdalena Chec, Krzysztof Olszewski, Piotr Dziechciarz, Patrycja Skowronek, Marek Pietrow, Grzegorz Borsuk, Miroslawa Bednarczyk, Grzegorz Jasina, Jozef Jasina, Mariusz Gagos
Summary: Adulterating wax with stearin significantly reduces brood survival rates and leads to scattered brood appearance, likely due to changes in royal jelly properties. On the other hand, paraffin adulteration does not affect brood survival but does weaken the mechanical strength of the combs. Even a small amount of stearin/stearic acid in wax makes it unsuitable for apiculture.
Article
Environmental Sciences
Arvind Kumar Singh, Abhishek Saxena, Nitin Agarwal
Summary: The study aims to investigate the thermal performance of solar air heaters using different absorber plates and configurations. The experiments were conducted in the summer conditions of Moradabad City, India, and four different models of solar air heaters were developed. The results showed that Model-4 performed the best with an average exhaust temperature of about 46 degrees C after sunset. The modified system showed higher efficiency compared to conventional systems, making it suitable for moderate-temperature applications such as agricultural drying and space heating.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Sreedevi Paramparambath, Muni Raj Maurya, Mohammad Talal Houkan, John-John Cabibihan, Kishor Kumar Sadasivuni
Summary: Paraffin wax, a commonly used phase-change material, has limitations in energy storage applications due to its low thermal conductivity. In this study, graphite and graphite-hydrogel were added to enhance the thermal conductivity and heat release properties of paraffin wax. The synthesized wax-graphite-hydrogel composite demonstrated significantly improved thermal conductivity and the potential to decrease the working temperature of semiconductor devices.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
R. Harish
Summary: This study numerically investigates the thermo-magnetic turbulent convection induced melting of nanoenriched paraffin wax dispersed with hybrid magnetic nanoparticle pairs. The dispersion of hybrid nanoparticle pairs enhances the melting fraction and average Nusselt number of paraffin wax. The natural convection induced melting generates quadruplet thermal plume patterns.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Oualid M'barki, John Clements, Luis Salazar, James Machac, Quoc P. Nguyen
Summary: Wax crystallization is a major issue in flow assurance. Paraffin inhibitors can reduce wax appearance temperature and prevent gelation, deposit formation, and pipeline blockage. The efficacy of inhibitors depends on their chemical structure and the properties of the crude oil. In this study, maleic anhydride-a olefin comb copolymer-based inhibitors with alkyl side chains were tested. The results showed that inhibitors with ester attachment of the alkyl side chains were more effective in reducing wax appearance temperature and oil viscosity. Asphaltenes also acted as natural inhibitors. Further research is needed to study inhibitors with different structural features and evaluate their efficacy.
Article
Polymer Science
Zekun Wang, Xiaoguang Zhang, Yunfei Xu, Guo Chen, Fankai Lin, Hao Ding
Summary: The study successfully prepared shape-stabilized composite phase change materials (PCMs) based on paraffin wax and carbon foam, which exhibit good thermal performance and cycle stability, with potential applications in industries such as construction, solar energy, and battery temperature-control systems.
Article
Polymer Science
Svetlana O. Ilyina, Anna V. Vlasova, Irina Y. Gorbunova, Nikolai I. Lukashov, Michael L. Kerber, Sergey O. Ilyin
Summary: The usual problem of meltable phase-change agents is their instability in form during heating, which can be solved by incorporating them into a continuous polymer matrix. This study demonstrates that molten paraffin wax forms a stable Pickering emulsion in an epoxy medium with the presence of asphaltenes extracted from heavy crude oil. The rheological studies reveal the viscoplastic behavior of the obtained dispersions at 25°C, which disappears upon heating and melting of the paraffin phase.
Article
Materials Science, Multidisciplinary
Shankar P. Koiry, Purushottam Jha, C. Sridevi, Deeksha Gupta, Veerender Putta, Anil K. Chauhan
Summary: Paraffin wax is explored as an encapsulating material for improving the water repellency of perovskite solar cells, and it exhibits stable photovoltaic performance under ambient conditions, making it a potential low-cost coating material.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
