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<p>A Cetyltrimethylammonium Bromide (CTAB)-based microemulsion system was employed for the treatment of oily sludge from the Jidong Oilfield. The microemulsion was composed of n-heptane as the oil phase, and aqueous solution containing n-butanol, sodium chloride (NaCl), and cetyltrimethylammonium bromide (CTAB) as water phase, with an oil-to-water volume ratio of 1:1. The phase behavior of the microemulsion system was systematically investigated, and the optimal formulation was determined by combining phase behavior analysis with oil-washing experimental results. The results showed that when the weight content of CTAB, NaCl, and n-butanol was 3.16%, 1.62% and 6.76% respectively, the oil removal efficiency was the highest. 84.9% of the oil could be removed when the treatment amount was 10 g (in microemulsion prepared by 100 mL water, the same below) under the system composition mentioned above. Based on this optimal formulation, the treatment temperature and contact time were further optimized. The results showed that the maximum oil removal efficiency of 85.3% was achieved at 30°C with a treatment duration of 2 hours.</p>

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Efficient Treatment of Oily Sludge by Microemulsion System Containing Cetyltrimethylammonium Bromide

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Han Xu,
  • Shuai Sun,
  • Xiaonan Wu,
  • Zhuang Ma,
  • Yubo Qi,
  • Xu Hu,
  • Siqi Hao

摘要

A Cetyltrimethylammonium Bromide (CTAB)-based microemulsion system was employed for the treatment of oily sludge from the Jidong Oilfield. The microemulsion was composed of n-heptane as the oil phase, and aqueous solution containing n-butanol, sodium chloride (NaCl), and cetyltrimethylammonium bromide (CTAB) as water phase, with an oil-to-water volume ratio of 1:1. The phase behavior of the microemulsion system was systematically investigated, and the optimal formulation was determined by combining phase behavior analysis with oil-washing experimental results. The results showed that when the weight content of CTAB, NaCl, and n-butanol was 3.16%, 1.62% and 6.76% respectively, the oil removal efficiency was the highest. 84.9% of the oil could be removed when the treatment amount was 10 g (in microemulsion prepared by 100 mL water, the same below) under the system composition mentioned above. Based on this optimal formulation, the treatment temperature and contact time were further optimized. The results showed that the maximum oil removal efficiency of 85.3% was achieved at 30°C with a treatment duration of 2 hours.