Article
Energy & Fuels
Feng Wang, Yangyang Yu, Bernard Wiafe Biney, Zheng Zhang, He Liu, Kun Chen, Zongxian Wang, Aijun Guo
Summary: This study systematically characterized the structure of heavy residual oil (RO) derived from vacuum residue (VR) thermal cracking, and investigated the occurrence pattern of olefins. The results showed that the occurrence of olefins during thermal cracking significantly contributed to a greater coking propensity of RO in further deep processing. The olefinic-bond-containing aromatics in the asphaltenes were found to confer the greatest contribution to the increasing coking propensity of RO.
Article
Engineering, Chemical
A. S. Lavrova, A. N. Nechaev, V. V. Vasilyev, V. M. Strakhov, V. N. Klementev
Summary: The study focuses on the possibility of producing petroleum coke from a mixture containing heavy tar and residue from the hydraulic processing of petroleum. The resulting petroleum coke samples undergo technical analysis and microstructure assessment, while the quality of the liquid coking products and the composition of the coking gases are also studied using physicochemical analysis.
COKE AND CHEMISTRY
(2021)
Article
Energy & Fuels
Sundaraiah Konda, Srikanta Dinda
Summary: This study examines the thermal cracking characteristic of a plant-derived hydrogenated carene (H-Carene) fuel and finds that its heat sink capability is comparable to petroleum-derived fuels. The use of triethylamine as an initiator is also shown to enhance the fuel's endothermicity.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Agriculture, Multidisciplinary
Lang Wang, Peiling Wu, Zhike Liu, Mengying Gu, Jian Xue
Summary: In order to address safety concerns regarding ginseng products and excessive pesticide levels, this study explores the transfer rules of pesticides during processing. The study focuses on calculating transfer rates and processing factors (PFs) using various common ginseng processing methods and 30 frequently occurring pesticides. The results show higher pesticide residues in alcohol extract compared to water extract, with 93.2% of pesticides transferring to the upper ethanol solution during water extraction and alcohol precipitation. Additionally, drying processes decrease the total amount of pesticide residues but increase their concentration. Water extraction-concentration-spray drying and alcohol extraction-concentration-vacuum drying are the processing methods with the lowest and highest pesticide processing factors, respectively.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Food Science & Technology
Wilton Pereira da Silva, Leidjane Matos de Souto, Joao Paulo de Lima Ferreira, Josivanda Palmeira Gomes, Antonio Gilson Barbosa de Lima, Alexandre Jose de Melo Queiroz, Rossana Maria Feitosa de Figueiredo, Dyego da Costa Santos, Maristela de Fatima Simplicio de Santana, Francislaine Suelia dos Santos, Lumara Tatiely Santos Amadeu, Pluvia Oliveira Galdino, Caciana Cavalcanti Costa, Aluizio Freire da Silva Junior, Celia Maria Rufino Franco
Summary: The aim of this study was to determine the thermophysical properties and process parameters of cylindrical carrot pieces during chilling. An analytical solution was developed using a heat conduction equation solver and coupled with an optimization software to determine the values of thermal diffusivity and heat transfer coefficient. The results were consistent with previous studies and showed high precision and confidence level.
Article
Energy & Fuels
He Liu, Bernard Wiafe Biney, Junlian Shi, Shiguang Fan, Aijun Guo, Feng Wang, Shouhui Jiao, Kun Chen
Summary: This study investigates the coking propensity and radical evolution of heavy residue and SARA fractions at different temperatures to understand the coke induction process. Results show that residue starts to form coke at higher temperatures while resins and asphaltenes produce coke at lower temperatures without an induction period. The solubility gap between reactant and coke influences the coke induction. The coking process can be described by different kinetics for residue and heavy fractions, while asphaltenes generate reactive radicals and contribute to the radical evolution. Maltene subfractions can inhibit the coking of asphaltenes by solvation and hydrogen donation behavior.
Article
Chemistry, Multidisciplinary
Yanjun Li, Shixuan Ren, Guozhu Liu, Zhenxia Liu, Ruifeng Ma
Summary: The TCA-2 coating can inhibit the coking of lubricating oil on the metal surface within a certain temperature range, reduce surface activity, and improve heat resistance. It also shows good compatibility with lubricating oil, effectively reducing the surface temperature of the oil side.
Article
Engineering, Chemical
Huiwen Zhang, Runhao Zhang, Zhang Ling, Wenya Li, Yujie Yan, Miao Gong, Jiangya Ma
Summary: This study investigated the partial oxidation of phenolic wastewater in supercritical water, showing that higher oxygen ratio favored the conversion of phenolics to gaseous products. Addition of NaOH and Ni catalyst improved hydrogen production efficiency, but a balance was observed due to the enhancement of hydrogenation and methanation reactions. The combined NaOH-Ni catalyst significantly enhanced organic pollutants removal and hydrogen gasification efficiency, providing valuable insights for future applications of supercritical water partial oxidation technology in wastewater treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Energy & Fuels
Paolo Guida, Eleonora Colombo, Elia Colleoni, Saumitra Saxena, Alessio Frassoldati, William L. Roberts, Tiziano Faravelli
Summary: This study introduces a predictive and generally applicative method for asphaltene pyrolysis modeling, showing good agreement with recent experimental data and providing a foundation for a more comprehensive project in the future.
Article
Energy & Fuels
Yulia Yu Borisova, Nikolay A. Mironov, Svetlana G. Yakubova, Dmitry N. Borisov, Igor P. Kosachev, Makhmut R. Yakubov
Summary: The study shows that the use of ethylene tar as an additive in the visbreaking process of vacuum residue can increase the yield of target products with a higher proportion of aromatic hydrocarbons.
Article
Chemistry, Physical
Joydev Manna, Prakash Jha, Rudranath Sarkhel, Chandan Banerjee, A. K. Tripathi, M. R. Nouni
Summary: The global interest in green hydrogen is increasing, with a focus on India's competitive hydrogen production capacity and the potential of solar photovoltaic technology. Water resources, land requirements, and reduced CO2 emissions from green hydrogen production are also key considerations. With the launch of India's National Hydrogen Mission, a transition to green hydrogen by the industry seems to be a near-term possibility.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Xing Yu, Yue Wu, Yanqiu Zhao, Changjian Wang
Summary: In this work, the characteristics of cryogenic hydrogen fires were investigated experimentally, including flame size, radiative power, and flame temperature. The results showed that flame size was influenced by nozzle diameter, stagnation pressure, and temperature. A correlation model was proposed for predicting flame size at different temperatures.
COMBUSTION AND FLAME
(2022)
Article
Chemistry, Physical
Mei Cheng, Jun Zhang, Chenqi Zhang, Jianli Wang, Yi Jiao, Yaoqiang Chen, Xiangyuan Li
Summary: To improve the stability of steam reforming catalyst, Ni, Co, and Fe monometallic and bimetallic catalysts supported on CaO-Al2O3 were prepared. Among them, the Ni-Fe/CaO-Al2O3 (NF/CA) catalyst showed the best performance under low steam-to-car carbon ratio condition, with high gas yield and selectivity, low carbon mass, and stable activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Agricultural Engineering
Xuerui Bai, Maiqian Nie, Zhenjun Diwu, Lei Wang, Hongyun Nie, Yan Wang, Qiuyue Yin, Bo Zhang
Summary: Phenols and petroleum hydrocarbons were the main contributors to COD in semi-coking wastewater. Their removal from the wastewater was urgent and valuable. Microbial strains were selected to create a microbial community for the treatment of the wastewater. The concentration of phenols decreased from 2450 +/- 1.2 mg/L to 200 +/- 0.9 mg/L, and microorganisms achieved a petroleum hydrocarbon removal rate of up to 97.08 +/- 0.09%. After the bioaugmentation process removed highly toxic phenolic compounds, the treated semi-coking wastewater became more biodegradable and showed significant improvement in water quality. The metabolic division of labor in the degradation of phenols, ring-cleavage of aromatic compounds, and mineralization of metabolites was further revealed through GC-MS and high-throughput sequencing technology. The microbial community consisting of Pseudomonas stutzeri N2 and Rhodococcus qingshengii FF was able to effectively and simultaneously remove phenols and petroleum hydrocarbons, indicating their potential for application in the aerobic biological treatment of large-scale semi-coking wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
E. G. Telyashev, I. R. Khairudinov, R. I. Khairutdinov, A. A. Tikhonov
Summary: The depletion of recoverable crude oil reserves in the world has led to an increased share of oil residues, particularly from high-viscosity oils and natural bitumen with low yield of light fractions in the turnover. The Institute of Petrochemical Processing has been actively developing noncatalytic processing technologies for heavy crude oils for almost 20 years. This article summarizes the progress made by the institute in this field, with some technologies already implemented and others ready for implementation.
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
(2023)