During the exploitation of shale gas, there are many oil-based drill cuttings (OBDC) produced, which are hazardous waste. In this paper, the characteristics of OBDC were analyzed and 25 hydrophobic deep eutectic solvents (DESs) were prepared as extractants for treating OBDC. The results showed that the DES formed by lauric acid and thymol had the highest extraction efficiency. The significant parameters of the extraction process were studied by using total petroleum hydrocarbon (TPH) as an index and the rational extraction conditions were recommended as follows: 0.8:1 mole ratio of lauric acid to thymol, 10:1 mass ratio of DES to OBDC, and 1 h extraction time at 60°C. The TPH of OBDC can be decreased from 14.75 to 0.87 wt.% at this recommended condition. The high extraction efficiency was also confirmed by energy dispersive spectrum results of treated OBDC. In addition, the lauric acid/thymol DES can be recycled and the TPH was still smaller than 1% after three cycles. This research suggests that hydrophobic DES extraction is an effective technology for TPH removal from OBDC.

中文翻译：

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疏水性深共熔溶剂处理油基钻屑

页岩气开采过程中产生大量油基钻屑（OBDC），属于危险废物。本文分析了 OBDC 的特性，制备了 25 种疏水性深共熔溶剂 (DES) 作为处理 OBDC 的萃取剂。结果表明，月桂酸和百里酚形成的DES提取效率最高。以总石油烃（TPH）为指标研究了提取工艺的重要参数，推荐合理的提取条件为：月桂酸与百里酚摩尔比为0.8:1，DES与OBDC质量比为10:1 , 和 1 h 提取时间在 60°C。在此推荐条件下，OBDC 的 TPH 可以从 14.75 降低到 0.87 wt.%。处理过的 OBDC 的能量色散谱结果也证实了高提取效率。此外，月桂酸/百里酚DES可以循环使用，三个循环后TPH仍小于1%。该研究表明，疏水 DES 提取是一种从 OBDC 中去除 TPH 的有效技术。