Interfacial Shear Rheology of the Waxy Oil-Water Interfacial Layer Construction by Span80/60/65: Influence of Hydrophobic Chain Structure.
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| Title: | Interfacial Shear Rheology of the Waxy Oil-Water Interfacial Layer Construction by Span80/60/65: Influence of Hydrophobic Chain Structure. |
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| Authors: | Wang, Chuanshuo1 (AUTHOR), Lv, Xiaofang1 (AUTHOR) lvxiaofang5@cczu.edu.cn, Sun, Bingcai2 (AUTHOR), Ma, Qianli1 (AUTHOR) qianlima@cczu.edu.cn, Liu, Yang1 (AUTHOR), Zhou, Shidong1 (AUTHOR), Duan, Jimiao3 (AUTHOR) |
| Source: | Petroleum Chemistry. Mar2024, Vol. 64 Issue 3, p357-365. 9p. |
| Subjects: | Oil-water interfaces, Nonionic surfactants, Pipe flow, Interface structures, Petroleum, Rheology |
| Abstract: | The waxy oil-water interface has become a topic issue in the field of a two-phase oil-water pipe flow. Although some progress has been achieved in the understanding of interfacial rheological properties of the water-in-oil emulsion (W/O), the effect of surfactants (the main constituents of petroleum crude oil) still remains unclear. To test whether the structure of hydrophobic chains of surfactants influences the waxy oil-water interface, we monitored interfacial rheological parameters under different nonionic surfactants (Span80/60/65) using a DWR interfacial shear rheometer. Among these surfactants, the oil-water interface of Span65 characterized by multi-hydrophobic chains had the largest interfacial viscosity and critical storage modulus. A weak strain overshoot interface of Span65 suggested that sorbitan tristearate molecules provided a dominant contribution to the interfacial rheological properties of the waxy oil-water interface with much fewer effects of the interaction between wax molecules and surfactants. However, Span60/80 with a single hydrophobic chain was coupled to wax molecules and reshaped the waxy oil-water interface structure, which replaced the original wax crystal position (the interfacial viscosity and critical storage modulus decrease) and yielded an interfacial structure (the critical strain increase). The wax-surfactant interactions of Span60/80 with different hydrophobic chain saturation were discussed. These interfacial properties are of practical importance for the technological operations in oil production. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The waxy oil-water interface has become a topic issue in the field of a two-phase oil-water pipe flow. Although some progress has been achieved in the understanding of interfacial rheological properties of the water-in-oil emulsion (W/O), the effect of surfactants (the main constituents of petroleum crude oil) still remains unclear. To test whether the structure of hydrophobic chains of surfactants influences the waxy oil-water interface, we monitored interfacial rheological parameters under different nonionic surfactants (Span80/60/65) using a DWR interfacial shear rheometer. Among these surfactants, the oil-water interface of Span65 characterized by multi-hydrophobic chains had the largest interfacial viscosity and critical storage modulus. A weak strain overshoot interface of Span65 suggested that sorbitan tristearate molecules provided a dominant contribution to the interfacial rheological properties of the waxy oil-water interface with much fewer effects of the interaction between wax molecules and surfactants. However, Span60/80 with a single hydrophobic chain was coupled to wax molecules and reshaped the waxy oil-water interface structure, which replaced the original wax crystal position (the interfacial viscosity and critical storage modulus decrease) and yielded an interfacial structure (the critical strain increase). The wax-surfactant interactions of Span60/80 with different hydrophobic chain saturation were discussed. These interfacial properties are of practical importance for the technological operations in oil production. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09655441 |
| DOI: | 10.1134/S0965544124020087 |
