Effect of Ionic Surfactants on Improving Deasphalting Selectivity in a Nonpolar System

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• 作者：Kang Seok Go ; Eun Hee Kwon ; Kwang Ho Kim ; Nam Sun Nho ; Ki Bong Lee
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：30
• 期：3
• 页码：2076-2083
• 全文大小：531K
• ISSN：1520-5029

文摘

To reduce the amount of solvent used in the solvent deasphalting process, this study investigated the possibility of improving deasphalting selectivity at a low solvent/oil ratio (SOR) by modifying the stability of the asphaltene colloidal dispersion with ionic surfactants. To do this, an experiment was conducted by changing the solvent types (n-pentane and n-heptane), temperature (35–90 °C), SOR (3–20, vol/vol), surfactants, and surfactant concentration (0.5–2.0 wt % of the feedstock). As a result, the ζ potential with sodium dodecyl sulfonate (SDS) was shown to decrease, while the ζ potential of pitch with cetylpyridinium chloride (CPCl) rose, as compared to those without surfactant. Also, the difference is bigger at a low SOR than at a high SOR. Finally, it was confirmed that, for SDS, the asphaltene content rose about 6% for the incremental 3% rise of pitch yield, while for CPCI, the asphaltene content rose 9–10% for the incremental 1.8% rise of the pitch yield, at the same time. The different movement of ζ potential and asphaltene content between SDS and CPCl can be explained by the adsorption mechanism.