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Kinetic parameter estimation for pyrolysis of empty fruit bunch using model-fitting and model-free methods

Materials Today: Proceedings 2022年 57卷 1241-1247页

作者： Sidek, Farah Nadiah Saleh, Suriyati Abdul Samad, Noor Asma Fazli Chemical Engineering Department College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia

This study aimed to evaluate and compare kinetic parameters pertaining to empty fruit bunch (EFB) by using model-free and model-fitting methods. The decomposition rate of EFB was examined using data from thermogravimetric analysis (TGA). Coats-Redfern, a model-fitting method, was used in this study, while the Friedman and Flynn-Wall-Ozawa (FWO) are the model-free methods. Both methods predicted the activation energy, E, and pre-exponential factor, A as kinetic parameters at 10, 20, and 50 K min−1. Results showed that the Coats-Redfern's regression coefficient (R2) was 0.9911, with E and A of 76.53 kJ mol−1 and 16269.44 min−1, respectively. For the Friedman method, the highest R2 was 0.9987, with a conversion factor of 0.6, E = 230.22 kJ mol−1, and A = 7.53 × 1019 min−1. Meanwhile, the R2 for the FWO was 0.9988 when the conversion factor was 0.7 (E = 473.37 kJ mol−1, A = 2.60 × 1019 min−1). To conclude, this study demonstrated that the Friedman and FWO methods are more relevant in representing the pyrolysis process. © 2021

关键词： Kinetic parameters

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The effects of additives on anti-wear properties of lubricating grease formulated from waste engine oil

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Egyptian Journal of Petroleum 2022年第3期31卷 71-76页

作者： Rahman, Nurul Waheeda binti Abdu Aziz, Mohd Aizudin bin Abd Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang 26300 Malaysia

The goal of this study was to study the anti-wear properties of grease formulated from waste engine oil (WEO) when additives are added. There were two types of grease formulated namely sodium and fumed silica (FS) greases. The greases were formulated using a weight percentage ratio with and without the addition of additives before the attributes of consistency, FTIR (Fourier transform infrared spectroscopy), and anti-wear analysis were conducted. Results showed that the addition of additives did not affect the properties of the formulated grease except for that of sodium grease as demonstrated by the FTIR result. Sodium grease produced a spectrum with a peak in the region < 600 cm⁻¹ when analyzed using FTIR. The corrosiveness of the grease toward the copper strip was also low, as determined by class 1 corrosiveness. The addition of additives resulted in no improvement in the anti-wear properties of the grease as the coefficient of friction (COF) was low for the grease without additives than for the grease with additives. However, the addition of additives can reduce the wear scar diameter of the greases. Based on the findings of this investigation, it was found that the addition of additives did not alter the properties of the greases or improve the anti-wear properties of the greases except for the wear scar diameter. © 2022 Egyptian Petroleum Research Institute

关键词： Anti-wear Grease Waste engine oil

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The potentials of emulsified modified bitumen (EMB) for coating and insulation: An overview

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Materials Today: Proceedings 2022年 57卷 1288-1295页

作者： Ishag Obi, Nasreldeen Najib Razali, Mohd Hamid Nour, Abdurahman Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Pahang Gambang Malaysia Department of Chemical Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Pahang Gambang Malaysia

Fungi mould and bacterial growth in the inner wall of buildings and operation theatres is a serious problem in the health sector. Too much moisture and dirt stimulate the growth of microorganisms. Therefore, the use of bitumen or emulsified modified bitumen product because of its adhesive properties and effective performance in coating and insulation is a promising technique to tackle this problem. However, the vast majority of bitumen and its modified products are mainly used in road paving, roofing application, and roads construction applications. Thus, the EMB product for the purpose of coating, soundproofing, and insulation needs to be properly addressed. Results obtained from this critical review have revealed the ability of EMB in insulation and coatings, as EMB paints showed a better performance than non-modified bitumen emulsion in terms of coating adhesion, aging, and heat insulation. Since the modified emulsions from waste substances is comparable to neat bitumen emulsions, the developed EMB from industrial waste will address natural resource dependency as well as the enormous environmental problem emerging from the overuse of natural resources. Further works nevertheless are needed to gain a better understanding of the mechanisms of EMB formulation in order to promote optimum industrial application. © 2021

关键词： Insulation

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Performance evaluation of nanosilica derived from agro-waste as lost circulation agent in water-based mud

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Petroleum Research 2023年第2期8卷 256-269页

作者： Augustine Agi Jeffrey O.Oseh Afeez Gbadamosi Cheo Kiew Fung Radzuan Junin Mohd Zaidi Jaafar Faculty of Chemical and Process Engineering Technology College of Engineering TechnologyUniversiti Malaysia Pahang26300GambangPahangMalaysia Institute for Oil and Gas(IFOG) Universiti Teknologi Malaysia81310Johor BahruMalaysia Federal University of Technology P.M.B.1526OwerriImo StateNigeria Department of Petroleum Engineering College of Petroleum and GeosciencesKing Fahd University of Petroleum and Minerals31261DhahranSaudi Arabia Department of Petroleum Engineering School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310 Johor BahruMalaysia

Seepage or loss of the mix-water from the drilling muds into the porous and permeable formations is a common problem during drilling *** drilling mud design requires a good knowledge of sealing integrity and all the factors influencing the mud to bridge through fractures or pore throat of exposed *** circulation materials(LCMs)are commonly introduced into the drilling mud to prevent or minimize filtrate *** study investigates silica nanoparticle(SNP)derived from rice husk(RH)termed RH-SNP using the wet-milling method as an LCM inwater-based mud(WBM).The impact of the RH-SNP in the enhancement of rheology and filtrate loss control properties of WBM was ***,the sealing integrity of the RH-SNP in a 1 mm and 2 mm simulated fracture for 7 min was determined using a stainless-steel slotted filter *** performance of the developed RH-SNP was compared with the widely applied *** synthesized RH-SNP at amount of 2.0 wt% significantly enhanced the yield point and plastic viscosity of the WBM by 75% and 386%,respectively,and minimized the fluid loss of the WBM by 47% at 80°*** enhancement is due to the particles ability to spread and interact efficiently with the *** the use of 1 mm and 2 mm simulated fracture for 7 min,the mud loss volume of the base mud reduced by 50%,66.7%,86%,and 90%(for 1 mm)and 40%,65.7%,77.1%,and 80%(for 2 mm)with the inclusion of 0.5 wt%,1.0 wt%,1.5 wt%,and 2.0 wt% of RH-SNP,***,the results showed that RH-SNP enhanced the seal integrity of the drilling mud and was more resistant to deformation compared to the *** findings of this study can help for better understanding of the application of RH-SNP as a loss circulation agent owing to its superior ability to seal fractured formation compared with the often used nutshell.

关键词： Rice husk silica nanoparticles Loss circulation material Fractured formation Water based-mud Rheology

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Demulsification of a water-in-crude oil emulsion with a corn oil based-demulsifier using the response surface methodology: Modelling and optimization

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Recent Innovations in chemical engineering 2021年第2期14卷 160-175页

作者： Saad, Abed Abdurahman, Nour Yunus, Rosli Mohd Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Gambang Pahang26300 Malaysia

In this study, the Sany-glass test was used to evaluate the performance of a new surfactant prepared from corn oil as a demulsifier for crude oil emulsions. Central composite design (CCD), based on the response surface methodology (RSM), was used to investigate the effect of four variables, including demulsifier dosage, water content, tem-perature, and pH, on the efficiency of water removal from the emulsion. Besides, analysis of variance was applied to examine the precision of the CCD mathematical model. The results indicate that demulsifier dose and emulsion pH are two significant parameters de-termining demulsification. The maximum separation efficiency of 96% was attained at an alkaline pH and with 3500 ppm demulsifier. According to the RSM analysis, the optimal values for the input variables were 40% water content, 3500 ppm demulsifier, 60 °C, and pH 8. © 2021 Bentham Science Publishers.

关键词： Demulsification

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Utilization of palm oil fuel ash (POFA) as catalyst support for methane decomposition

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Materials Today: Proceedings 2022年 57卷 1136-1141页

作者： Hanifa, Nurul Husna Elyana Ismail, Mazni Ideris, Asmida Department of Chemical Engineering College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Pahang Kuantan Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Pahang Kuantan Malaysia

An agricultural waste, palm oil fuel ash (POFA) has been evaluated as a Ni catalyst support for the methane decomposition process. The effects of solvent and pre-treatment technique during the POFA pre-treatment have been investigated towards the catalytic performance of Ni supported on POFA (Ni-POFA) catalyst prepared at 10 wt% Ni loading. Methane decomposition of Ni-POFA catalyst was carried out at 550 °C for 6 hrs. The POFA and Ni-POFA were characterized using X-ray fluorescence (XRF), X-ray diffractometer (XRD), N2 adsorption–desorption isotherms and field emission scanning electron spectroscopy (FESEM). The results showed that citric acid solution was the best solvent for POFA pre-treatment. The SiO2 content in the POFA pre-treatment improved from 42.4 to 72 wt%. Good CH4 conversion achieved by Ni-POFA catalyst in the methane decomposition was attributed to high SiO2 in the POFA treated with citric acid. Compared to conventional stirring, pre-treatment of POFA with ultra-sonication technique has produced POFA support with smaller particles size, and Ni-POFA catalyst with better BET surface area and better Ni dispersion. These catalyst properties have contributed to an exceptional catalytic performance of 71% of initial CH4 conversion and 4.2% of initial H2 yield of Ni-POFA catalyst in the methane decomposition. The work suggests that POFA has the potential to be utilized as catalyst support, and pre-treatment is crucial for a reasonable catalytic performance in methane decomposition. © 2021

关键词： Palm oil

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Agri-food waste biosorbents for volatile organic compounds removal from air and industrial gases – A review

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Science of the Total Environment 2024年 945卷 173910页

作者： Makoś-Chelstowska, Patrycja Slupek, Edyta Gębicki, Jacek Department of Process Engineering and Chemical Technology Faculty of Chemistry Gdansk University of Technology Gdańsk80-233 Poland

Approximately 1.3 billion metric tons of agricultural and food waste is produced annually, highlighting the need for appropriate processing and management strategies. This paper provides an exhaustive overview of the utilization of agri-food waste as a biosorbents for the elimination of volatile organic compounds (VOCs) from gaseous streams. The review paper underscores the critical role of waste management in the context of a circular economy, wherein waste is not viewed as a final product, but rather as a valuable resource for innovative processes. This perspective is consistent with the principles of resource efficiency and sustainability. Various types of waste have been described as effective biosorbents, and methods for biosorbents preparation have been discussed, including thermal treatment, surface activation, and doping with nitrogen, phosphorus, and sulfur atoms. This review further investigates the applications of these biosorbents in adsorbing VOCs from gaseous streams and elucidates the primary mechanisms governing the adsorption process. Additionally, this study sheds light on methods of biosorbents regeneration, which is a key aspect of practical applications. The paper concludes with a critical commentary and discussion of future perspectives in this field, emphasizing the need for more research and innovation in waste management to fully realize the potential of a circular economy. This review serves as a valuable resource for researchers and practitioners interested in the potential use of agri-food waste biosorbents for VOCs removal, marking a significant first step toward considering these aspects together. © 2024 The Authors

关键词： Volatile organic compounds

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Magnetic Porous Material Derived from Ni-MOF for the Removal of Tetracycline from Aqueous Solution

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ACS Applied Nano Materials 2024年第7期7卷 7614-7621页

作者： Xue, Yuhui Wang, Jingjing Wang, Meng Li, Jiang Wang, Kefu Hassan, Afaq Guo, Changyan Wang, Jide Xinjiang Key Laboratory of Oil and Gas Fine Chemicals College of Chemistry and Chemical Engineering Xinjiang University Urumqi 830046 China Technical Center of Urumqi Customs Urumqi 830063 China Xinjiang Uygur Autonomous Region Center for Disease Control and Prevention Urumqi 830002 China Department of Process Engineering and Chemical Technology Chemical Faculty Gdansk University of Technology Gdansk 80-233 Poland

The efficient removal of antibiotic residues from aqueous solution is very important for water security. Studies have found that adsorption is widely used for the removal of antibiotics due to its cost-effectiveness, low energy consumption, simplicity of operation, and environmental friendliness. In this study, a novel magnetic porous carbon adsorbent (Ni-MPC-400) with a high adsorption capacity and saturation magnetization was synthesized via direct carbonization of Ni-MOF at 400 °C pyrolysis temperature and used to efficiently remove tetracycline from an aqueous solution. Adsorption experiments showed that Ni-MPC-400 exhibited excellent tetracycline adsorption capacity (441.51 mg·g^-1) from the aqueous solution. Possible adsorption mechanisms were proposed through characterization and analysis. The adsorption mechanisms mainly involved π-π interactions, hydrogen bonding, metal-organic complexation, and pore filling effects. In addition, Ni-MPC-400 showed rapid and sufficient adsorption at a low concentration of tetracycline (5 mg·L^-1) and good adsorption performance over a wide pH range. In addition, the material has been tested to have good immunity to interference and regenerative capacity, demonstrating a potential application in the removal of tetracycline contaminants from aqueous solutions. © 2024 American chemical Society.

关键词： aqueous solutions magnetic porous material Ni-MOF Ni-MPC-400 tetracycline

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Sustainable bioethanol production by solid-state fermentation: a systematic review

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Environmental Science and Pollution Research 2024年 1-19页

作者： Ruslan, Nur Fathin Ahmad, Noormazlinah Abas, Azlan Sanfilippo, Antonio Mahmoud, Khaled Munaim, Mimi Sakinah Abdul Nour, Abdurahman Hamid Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuhraya Tun Razak Pahang Kuantan26300 Malaysia Faculty of Social Sciences and Humanities Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia Qatar Environment and Energy Research Institute Hamad Bin Khalifa University–Qatar Foundation Doha Qatar

The escalation of the global population has accelerated the demand for sustainable energy sources such as bioethanol. Traditionally, bioethanol was obtained by the fermentation of sugar from agricultural crops and grains. However, this technique creates serious threats on the global food supplies, thus hindering the commercial production of bioethanol. Therefore, there is a need to develop new technologies and low-cost raw materials in order to ensure that bioethanol is economically comparable to the first generation of bioethanol. Solid-state fermentation (SSF) has been in the limelight within the scientific community because of its efficiency, cost-effectiveness, and promising technology to produce bioethanol. SSF involves the cultivation of microorganisms on a solid substrate in the absence of free-flowing water, which eliminates the need for sugar extraction and reduces wastewater production. This systematic review provides an overview of the applications of SSF in bioethanol production while presenting recent studies and advancements of this technology for producing sustainable and cost-effective bioethanol. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Yeast

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Factorial analysis on nanocomposite membranes for CO2, CH4 and N2

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Materials Today: Proceedings 2022年 57卷 1306-1314页

作者： Aqilah Ghazali, Alia Abd Rahman, Sunarti Abu Samah, Rozaimi Department of Chemical Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia

This study aims to develop, characterize, and optimize the nanocomposite membranes comprised of the coated polyether block amide (Pebax) filled with two different types of nanoadsorbent derived from agricultural wastes on the commercial polyvinylidene fluoride (PVDF) support membrane. To systematically investigate the influence of several membrane preparation conditions on gas separation performance, fractional factorial design (FFD) was applied. The considered conditions include Pebax concentration (3 and 6 wt%), type of nanoadsorbents which are oil palm frond (OPF) and pineapple peel (PP), nanoadsorbents concentration (0.5 and 5 wt%) and sonication time (15 and 60 min). Analysis of variance (ANOVA) technique was used to identify the main and interaction effects of the considered conditions on the gas permeability (CO2, CH4 and N2) and selectivity (CO2/CH4 and CO2/N2). The findings from the screening study suggested that the most influential factors that affect the permeability and selectivity are Pebax concentration and nanoadsorbent type. The incorporation of 5 wt% nano-pineapple peel activated carbon (PPAC) into 6 wt% of Pebax matrix had resulted in a high CO2 permeability, CO2/CH4 selectivity and CO2/N2 selectivity of 1682.76 Barrer, 33.17, and 37.03, respectively, which manage to perform beyond the Robeson plot. © 2021

关键词： Nanocomposites

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