Evaluation of the effect of water and sodium chloride solution on the adsorption of asphaltene dispersed in toluene on dolomite in presence of bacterial products

Document Type : Research paper

Authors

1 Department of Petroleum Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

2 Department of Petroleum Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.

3 Department of Mining Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.

Abstract

Objective: The main objective of this study is to investigate the effect of water and sodium chloride as the most common salt on the asphaltene adsorption on dolomite in the presence of products of Bacillus subtilis.
Materials and methods: Asphaltene was first extracted, and Fourier transform infrared spectroscopy (FTIR) and elemental analyses of asphaltene were performed. Micro-dolomite was prepared, and X-ray fluorescence spectroscopy (XRF) analysis was performed. Bacillus subtilis bacterium had grown in the dolomite presence, and FTIR analysis of dolomite was evaluated before, and after bacterial products. Then, a toluene solution containing asphaltene and water solutions containing sodium chloride were prepared at concentrations of 1000 to 40000 mg/L, and the asphaltene adsorption was investigated in presence of 20 and 50%v NaCl solution and in presence of bacterial products.
Results: In two phase system (dolomite and toluene containing asphaltene), the presence of bacterial products resulted in decreasing asphaltene adsorption from 28 to 19.4%w. The presence of deionized water in a system, including toluene containing asphaltene and dolomite without bacterial products, reduced the asphaltene adsorption, and the asphaltene adsorption decreased from 28%w to 10.7%w in the presence of 20%v, and to 7.1%w in the presence of 50%v deionized water. In three phase system, including dolomite with bacterial products, deionized water increased asphaltene adsorption. With increasing NaCl concentration from 1000 to 3000 mg/L, the asphaltene adsorption decreased, however, with further increasing NaCl concentration from 3000 to 40000 mg/L, the asphaltene adsorption increased. The simultaneous presence of NaCl solution and bacterial products had a significant effect on reducing the performance of bacterial products in the adsorption of asphaltene on dolomite rock.
Conclusions: Bacterial products in deionized water increases the adsorption of asphaltene, however, the presence of sodium chloride greatly reduces the effect of bacterial products on the adsorption of asphaltene.

Keywords

References

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Journal of Separation Science and Engineering
Volume 17, Issue 2
December 2025
Pages 17-33

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