| 摘要: |
| 酸碱开关溶剂是一类由酸碱调控,可实现溶剂亲水性和疏水性之间相互转变的绿色智能溶剂。利用酸碱开关溶剂来处理废弃含油钻屑是一种高效、环保、易操作、可循环利用的方法。以N,N-二甲基环己胺为酸碱开关溶剂,选择乙酸/NaOH水溶液调节开关溶剂的亲疏水性,用于清洗废弃含油钻屑,对清洗效率及胺的回收率进行评价。实验结果表明:N,N-二甲基环己胺的亲疏水性可由乙酸/NaOH水溶液进行可逆调控,整个循环至少能够重复4次；N,N-二甲基环己胺的酸碱开关特性使得模拟油能够很好地与胺分离；当N,N-二甲基环己胺与含油钻屑质量比为3∶1或更高时,N, N-二甲基环己胺能够彻底清洗废弃含油钻屑,清洗后的钻屑含油率低至0.21% (w),且N,N-二甲基环己胺的回收率高达95%以上。这种开关溶剂能够高效清洗钻屑,同时能够重复利用,有效地降低成本。 |
| 关键词: 开关溶剂 酸碱开关 N,N-二甲基环己胺 含油钻屑 |
| DOI：10.3969/j.issn.1007-3426.2019.05.020 |
| 分类号: |
| 基金项目:国家自然科学基金面上项目“CO2开关溶剂体系构建及其在油泥分离中的应用研究初探”(21573174) |
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| Treatment of oily drilling cuttings based on acid-base switchable solvent |
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Huang Qing1, Tao Sha2, Rao Wei1, Li Xiaojiang2, Lu Hongsheng2
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1. Sichuan Environment & Engineering Appraisal Center, Chengdu, Sichuan, China;2. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
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| Abstract: |
| Acid-base switchable solvents are a kind of green intelligent solvents in which the reversible transformation between hydrophilicity and hydrophobicity of solvents can be realized by acid-base. Treatment technology of oil drilling cuttings based on acid-base switchable solvent is an efficient, environmental-friendly, easy-to-operate and recyclable approach. In this paper, N,N-dimethylcyclohexylamine was used as the acid-base switchable solvent for cleaning the abandoned oil drilling cuttings, while acetic acid/sodium hydroxide solution was used to control the hydrophilicity or hydrophobicity of solvent for evaluating the cleaning efficiency and the recovery rate of amine. It was found that the hydrophilicity or hydrophobicity of N, N-dimethylcyclohexylamine could be reversibly controlled by acetic acid/sodium hydroxide solution, and the complete cycle could be repeated at least 4 times. The acid-base switchable characteristic of N, N-dimethylcyclohexylamine enabled the simulated oil to be well separated from the amine. When the mass ratio of N, N-dimethylcyclohexylamine to oil-bearing drilling cuttings is 3∶1 or higher, N, N-dimethylcyclohexylamine can thoroughly clean the waste oil-bearing drilling cuttings. After cleaning, the oil content of drilling cuttings is as low as 0.21 wt%, and the recovery rate of N, N-dimethylcyclohexylamine is as high as 95%. The switchable solvent can efficiently clean drilling cuttings, and can be reused, thus reducing costs effectively. |
| Key words: switchable solvent acid-base trigger N N-dimethylcyclohexylamine oil drilling cutting |
