Review
Energy & Fuels
Dduha Chehadeh, Xiaoliang Ma, Hamza Al Bazzaz
Summary: The need to upgrade heavy oil and residue into cleaner fuel and more valuable products is continuously increasing in refineries. Hydrotreating is the most common and essential process for this purpose. Understanding the kinetics of hydrotreating is important for improving the upgrading chemistry and petroleum refining process.
Article
Energy & Fuels
Zarrin Nasri
Summary: This study investigated the effects of operational conditions on SARA fractions during the upgrading of vacuum residue using microwave irradiation. The results showed that under the optimal conditions, the chemical composition of the feedstock was substantially improved.
PETROLEUM SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Hong Yin, Yafei Chen, Xutao You, Ziqiang Chen, Donglin He, Haifeng Gong
Summary: This study utilized nuclear magnetic resonance analyses to investigate the structure distribution of ultra-heavy oil and its four components. Improved methods were used to identify and adjust structural parameters, leading to higher accuracy. The research provides updated understanding of specific component structural information for ultra-heavy oil and facilitates subsequent reactivity and simulation studies.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Chemical
Boliang Li, Binfei Li, Yunong Zang, Di Zhu, Zhaomin Li, Liwei Ruan
Summary: In this study, the effect of flue gas on steam distillation of heavy oil was investigated. The results showed that the yield of flue gas + steam distillation was 3.88% higher than that of pure steam distillation. Increasing steam superheat during flue gas-steam co-injection expanded the carbon number distribution range of the distillates and increased the distillation yield. The research findings are significant for understanding the mechanism of flue gas enhanced steam development of heavy oil.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Abdul Salam Abdul Raheem, Dorra Hentati, Dawoud Bahzad, Raeid M. M. Abed, Wael Ismail
Summary: We enriched bacterial consortia from oilfield samples and found that they have potential for bio-catalytic upgrading of heavy crude oil. Treatment with one bacterial consortium resulted in an increase in saturates fraction, a decrease in aromatics fraction, a reduction in asphaltene content, and an increase in resins. The biotreated oil also showed better recovery of fractions compared to the non-treated oil. The bacterial consortia composition varied with the source and changed over time, with certain bacteria identified as key players in the bioupgrading process.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2022)
Article
Energy & Fuels
Guillermo Felix, Alexis Tirado, Ameen Al-Muntaser, Michael Kwofie, Mikhail A. Varfolomeev, Chengdong Yuan, Jorge Ancheyta
Summary: A new kinetic model based on SARA fractions is proposed for the non-catalytic aquathermolysis of heavy crude oil. Experimental results demonstrate a good fit between the model and the data.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
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
Engineering, Environmental
Chiemeka Onyeka Okoye, Mingming Zhu, Isabelle Jones, Juan Zhang, Zhezi Zhang, Dongke Zhang
Summary: This study investigated the preparation of carbon black (CB) from heavy residues of spent tyre pyrolysis oil, demonstrating that higher temperatures led to higher yields and better quality of CB. However, increased residence time (R-time) and O-2 concentration had a trade-off with total yield. Interestingly, the CB derived from the heavy residues had more surface functional groups compared to commercial products, which is beneficial for enhanced bonding and mechanical properties.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Qing-An Xiong, Yu-Ming Zhang, Pei Qiao, Guo-Tong Li, Jia-Zhou Li, Wei Zhang
Summary: The pyrolysis behaviors and kinetics of Qingdao vacuum residue and its SARA fractions were evaluated. The results showed that the pyrolysis behavior was influenced by temperature range and interaction between fractions, and exhibited certain regularities.
Article
Chemistry, Multidisciplinary
Jun Woo Park, Min Yong Kim, Soo Ik Im, Kang Seok Go, Nam Sun Nho, Ki Bong Lee
Summary: This study conducted a quantitative analysis to predict the yields of deasphalted oil (DAO) in the solvent deasphalting (SDA) process. The effects of temperature and solvent-to-oil ratio (SOR) on the DAO yield were explained using simple and accurate correlations. The results showed that temperature and SOR have a significant impact on the DAO yield.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Engineering, Chemical
Zhengyu Chen, Song Feng, Linzhou Zhang, Gang Wang, Quan Shi, Zhiming Xu, Suoqi Zhao, Chunming Xu
Summary: A heavy petroleum fluid catalytic cracking (FCC) process model based on the SU-BEM framework was developed to represent complex molecular reaction networks. The model showed good agreement with experimental values after parameter estimation, predicting product yields as the variable of interest.
Article
Energy & Fuels
Xincheng Zhang, Changqing He, Jingjing Zhou, Ying Tian, Lin He, Hong Sui, Xingang Li
Summary: Two strategies, including interfacial reconstruction and bulk oil phase property regulation, were proposed to enhance the demulsification of water-in-heavy oil emulsions. A novel demulsifier, TJU-3, was designed to break the rigid interfacial film, showing faster dehydration rate and no tailing phenomenon. The combination of demulsifiers with diluents at slight heating conditions achieved complete dehydration of the emulsions.
Article
Engineering, Chemical
J. Garcia Cardenas, J. Ancheyta
Summary: The deasphalting process was modeled and predicted using continuous thermodynamics and the perturbed hard chain theory equation of state. The results showed that the model can accurately predict the product yields, quality, and distribution in the deasphalting process.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Liang-Liang Wang, Teng-Fei Wang, Yang Yang, Xiao-Qiang Peng, Jie-Xiang Wang, Wan-Fen Pu
Summary: The study found that aromatics can reduce heat enthalpy and change activation energy in multivariate mixtures of SARA fractions, playing an important role in oxidation reactivity.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Yasuki Kansha, Shoma Kato, Koji Tsuji
Summary: As global oil production increases, the quality of crude oil deteriorates and becomes heavier. It is necessary to develop improved refinery processes. This study evaluated the characteristics of residue desulfurization reactions in crude oil samples using petroleomics and molecular structure data, and identified the effects of molecular structures on desulfurization and denitrification processes.
COMPUTERS & CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
A. Pavlova, D. Stratiev, M. Mitkova, K. Stanulov, N. Dishovsky, K. Georgiev
ACTA CHROMATOGRAPHICA
(2015)
Article
Chemistry, Analytical
A. Pavlova, I. Sharafutdinov, D. Dobrev, D. Stratiev, I. Shishkova, M. Mitkova, N. Rudnev
ANALYTICAL LETTERS
(2016)
Article
Energy & Fuels
Antoaneta I. Pavlova, Dimitar S. Dobrev, Pavlina G. Ivanova
Article
Chemistry, Applied
Dicho Stratiev, Vasil Yankov, Ivan Petrov, Ivelina Shishkova, Antoaneta Pavlova, Pavlina Ivanova, Andriana Surleva, Kaloyan Hristov, Elena Todorova, Anna Obryvalina, Raushan Telyashev
FUEL PROCESSING TECHNOLOGY
(2014)
Article
Biochemical Research Methods
Antoaneta Pavlova, Olga Stoyanova, Pavlina Ivanova, Teodora Dimova
JOURNAL OF CHROMATOGRAPHIC SCIENCE
(2014)
Article
Environmental Sciences
A. Pavlova, I Shishkova, D. Stratiev, D. Yordanov, V Toteva, P. Batchvarov
Summary: Odour is a property created by a mixture of volatile chemical species that stimulate the olfaction sense to trigger a sensation of smell. The impact of odours on the surrounding areas is influenced by various factors, so different techniques are needed to determine the qualitative and quantitative characteristics of odour emissions.
JOURNAL OF ENVIRONMENTAL PROTECTION AND ECOLOGY
(2021)
Article
Environmental Sciences
A. Pavlova, I Shishkova, D. Stratiev, D. Yordanov, V Toteva, P. Batchvarov
Summary: There is limited literature on the use of dispersion models for validating experiments involving highly odorous substances. It can be difficult to trace the exact odorous compounds and establish a link between their analytical concentrations and odor properties, making it challenging to effectively perceive odors. This article reviews applied dispersion models for estimating odor emissions and discusses how to compare actual odor measurement results with model predictions.
JOURNAL OF ENVIRONMENTAL PROTECTION AND ECOLOGY
(2021)
Article
Chemistry, Multidisciplinary
I. Sharafutdinov, A. Pavlova, D. Stratiev, P. Petkov, I. Shishkova, R. Dinkov
OXIDATION COMMUNICATIONS
(2012)
Article
Energy & Fuels
I. Sharafutdinov, D. Stratiev, I. Shishkova, R. Dinkov, A. Pavlova, P. Petkov, N. Rudnev
OIL GAS-EUROPEAN MAGAZINE
(2012)
Article
Chemistry, Multidisciplinary
O. N. Stoyanova, A. I. Pavlova, R. I. Ivanova
OXIDATION COMMUNICATIONS
(2011)
Article
Chemistry, Multidisciplinary
D. Stratiev, A. Pavlova, R. Dinkov, K. Stanulov
OXIDATION COMMUNICATIONS
(2011)
Article
Chemistry, Analytical
Pavlina Ivanova, Ditso Stratiev, Antoaneta Pavlova
JOURNAL OF AOAC INTERNATIONAL
(2006)
Article
Energy & Fuels
A Pavlova, S Petrov, R Milina, R Ivanova
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
(2004)
Article
Chemistry, Multidisciplinary
A Pavlova
OXIDATION COMMUNICATIONS
(2004)