Zeeshan Rashid

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Effect of hydrophobic ionic liquids on petroleum asphaltene dispersion and determination using UV-visible spectroscopy

AIP Conference Proceedings, 2017

Asphaltene aggregation and flocculation is one of the main problems faced by upstream industry. T... more Asphaltene aggregation and flocculation is one of the main problems faced by upstream industry. The aim of this research activity is to explore the effect of synthesized imidazolium and pyridinium based ionic liquids on the prevention of asphaltene aggregation problem in crude oil. In this research, number of hydrophobic and hydrophilic ionic liquids were tested. The investigations were performed for evaluating; the dispersion yield, effect of temperature, effect of stirring time and effect of solvent to flocculant ratio. Analysis were done using UV-visible Spectroscopy. The results depicted that the investigated hydrophobic ionic liquids have the tendency to abate asphaltene aggregation and can be considered as deflocculants.

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A comprehensive review on the recent advances on the petroleum asphaltene aggregation

Journal of Petroleum Science and Engineering, 2019

Asphaltene finds a distinguished position in current research on liquid and solid hydrocarbon fue... more Asphaltene finds a distinguished position in current research on liquid and solid hydrocarbon fuels due to its self-aggregating nature. The presence of asphaltene in crude oil will reduce the quality of crude oil itself by increasing the operating cost due to the arterial blockage in extraction, transportation and refining process. To date, the self-association of asphaltene has been widely explored around the world, even at the molecular level. Quite a few studies have led to the development of model compounds that resemble their chemical and colloidal characteristics. Based on the veracity regarding asphaltene structural configuration, it is believed that the mechanism of asphaltene self-aggregation needs special attention to process asphaltenic crude oil. The intention of this review is to understand the mechanism of petroleum asphaltene aggregation with the help of the studied model compounds and discuss the recent developments with respect to its colloidal and interfacial activity. The complexities of asphaltene science have been addressed comprehensively and controversies regarding asphaltene aggregation has been successfully resolved. This review provides insight to readers regarding the asphaltene colloidal and aggregated structure. At last, a point of view toward future advancement is also proposed with the objective of conquering challenges and fortifying further research into this promising field.

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Screening of ionic liquids as green oilfield solvents for the potential removal of asphaltene from simulated oil: COSMO-RS model approach

Journal of Molecular Liquids, 2018

Screening of ionic liquids as green oilfield solvents for the potential removal of asphaltene fro... more

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Synthesis, thermophysical properties, Hammett acidity and COSMO-RS study of camphorsulfonate-based Brönsted acidic ionic liquids

Journal of Molecular Liquids, 2018

Synthesis, thermophysical properties, Hammett acidity and COSMO-RS study of camphorsulfunate-base... more

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Asphaltene Separation with Designer Solvents for the Deasphaltenes Process-A Quantum Chemical Approach

Procedia Engineering, 2016

Significance of Ionic Liquids (ILs), designer solvents, on inhibiting the asphaltene deposition p... more Significance of Ionic Liquids (ILs), designer solvents, on inhibiting the asphaltene deposition provided the alternative solution to the problem. In this work, 34 anions and 3 cations comprising of 102 combinations of ILs were investigated for a model asphaltene molecule via quantum solvation software tool COSMO-RS (Conductor like Screening for Real Solvents). Validation is done by comparing literature values of activity coefficient at infinite dilution (IDAC) of alkanes, cycloalkanes and aromatic in 3 ILs with 111 data points at 3 sets of different temperatures. Percent relative absolute average deviation (%RAAD) was found to be 10%. Thereafter IDAC values were predicted for model asphaltene compound in the cations and anions combinations for performance analysis. It is found that smaller cation with sterically shielded large anion gave the large performance for removal of upgrading the asphaltenic crude oil.

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Investigating the solubility of petroleum asphaltene in ionic liquids and their interaction using COSMO-RS

Journal of Industrial and Engineering Chemistry, 2019

Highlights  Dispersion efficiency of asphaltene using ionic liquids were discussed.  Sigma prof... more Highlights  Dispersion efficiency of asphaltene using ionic liquids were discussed.  Sigma profile of all the studied ILs were analyzed.  Activity Coefficient, excess enthalpy, HB-donor sigma moment and HB_accepter sigma moments were predicted  Effect of structural variation of IL such as cation head family, alkyl chain length of cation, functional group on cation alkyl chain, nature of anion, alkyl chain length of anion, functional group of anion and polarity of cation and anion.  COSMO_RS supports that not only charge sharing ability of cation and nonpolar side chain but also hydrophobicity of anion drives the dispersion efficiency of asphaltene.

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COSMO-RS based screening of ionic liquids for extraction of phenolic compounds from aqueous media

Journal of Molecular Liquids, 2021

Abstract Due to the superior thermophysical properties and tunable nature of ionic liquids (ILs),... more Abstract Due to the superior thermophysical properties and tunable nature of ionic liquids (ILs), these materials are considered as potential alternative for the removal of phenolic compounds by separation. COSMO-RS (Conductor like Screening Model for Real Solvent) based screening was used to select efficient ILs for the removal of phenolic compounds using liquid-liquid phase extraction (LLE). For this purpose, a combination of 40 cation (involving imidazolium, pyridinium, pyrrolidinium, ammonium and phosphonium) and 20 different anions in 800 possible combinations were screened via COSMO-RS to predict their selectivity and capacity at infinite dilution for phenolic compounds removal. From the simulation results, it can be concluded that anions, cation, alkyl chain length and functional group on the cation have significant effects on the binding of phenolic compounds to ILs. Based on the COSMO-RS screening results, some general guideline on the proper selection of ILs for phenolic compound extraction from aqueous solution are proposed and discussed.

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