Pore-Scale Analysis of Green Solvents for Solvent-Based Bitumen Recovery

Mohammad Alikarami, Sedigheh Mahdavi, Jesus Guayaquil Sosa, Jinguang Hu, Arindom Sen and Hector De la Hoz Siegler*, 
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Abstract

Bitumen is a critical resource for materials and energy, but its high viscosity requires energy-intensive recovery methods with significant environmental impacts. While CO2 emissions per barrel from oil sands have decreased by 30% over two decades, further innovations are needed for sustainable extraction. We studied green solvents derived from biomass as an environmentally friendly alternative to hydrocarbons in solvent-assisted bitumen recovery. Using Hansen solubility parameters, we optimized binary solvent mixtures to enhance the solubility and minimize viscosity. A novel high-pressure microfluidic device was used to simulate reservoir conditions, verify predictions based on Hansen solubility, and evaluate recovery performance, while dynamic light scattering and elemental analyses revealed the effect of solvent composition on bitumen precipitation and solubility. In toluene/furfural and toluene/guaiacol mixtures, the particle size of dispersed species was larger than that in toluene/ethyl acetate. Moreover, heptane/ethyl acetate caused a higher precipitation of the aromatic fractions. These findings advance the understanding of green solvents for reducing the carbon footprint of bitumen recovery technologies.

Abstract Image

溶剂型沥青回收绿色溶剂的孔隙尺度分析
沥青是一种重要的材料和能源资源,但它的高粘度需要高能耗的回收方法,对环境影响很大。虽然在过去的20年里,每桶油砂的二氧化碳排放量下降了30%,但可持续开采还需要进一步的创新。我们研究了从生物质中提取的绿色溶剂,作为溶剂辅助沥青回收中碳氢化合物的环保替代品。利用汉森溶解度参数,我们优化了二元溶剂混合物,以提高溶解度并最小化粘度。采用一种新型高压微流体装置模拟储层条件,验证基于Hansen溶解度的预测,并评估采收率性能,而动态光散射和元素分析则揭示了溶剂组成对沥青沉淀和溶解度的影响。在甲苯/糠醛和甲苯/愈创木酚混合物中,分散物种的粒径大于甲苯/乙酸乙酯混合物。此外,庚烷/乙酸乙酯使芳香族馏分析出率更高。这些发现促进了对绿色溶剂的理解,以减少沥青回收技术的碳足迹。
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