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<p>Oxygen (O<sub>2</sub>) solubility in hydrocarbons plays a crucial role to control conversion and product selectivity during liquid phase oxidation of hydrocarbons to produce petrochemicals. In spite of its importance, experimental measurements of O<sub>2</sub> solubility in liquid hydrocarbons are not abundant. Because it is challenging to experimentally determine the oxygen in hydrocarbons following traditional titration method as reagents react with hydrocarbons. In the current study, the O<sub>2</sub> solubility was measured using a differential pressure-based measurement method in <i>n</i>-heptane, <i>n</i>-decane, <i>n</i>-dodecane, <i>n</i>-tetradecane, <i>n</i>-hexadecane, and tetralin at 294&#xa0;K. Henry constants were calculated and were in the range 0.03–0.40 mol‧m<sup>−3</sup>‧kPa<sup>−1</sup>. At 140&#xa0;kPa O<sub>2</sub> pressure, in <i>n</i>-tetradecane and <i>n</i>-hexadecane O<sub>2</sub> solubility was in the range 4–24 mol‧m<sup>−3</sup>, compared to O<sub>2</sub> solubility in <i>n</i>-heptane and <i>n</i>-decane which was in the range 27–57 mol‧m<sup>−3</sup>. The O<sub>2</sub> solubility expressed as a mole fraction of the total liquid appeared to have a slightly decreasing trend with an increase in carbon number in the alkanes.</p>

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O2 Solubility in C7–C16 n-Alkanes

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Muhammad N. Siddiquee,
  • Adriana Rivolta,
  • Mohammad M. Hossain,
  • Arno de Klerk

摘要

Oxygen (O2) solubility in hydrocarbons plays a crucial role to control conversion and product selectivity during liquid phase oxidation of hydrocarbons to produce petrochemicals. In spite of its importance, experimental measurements of O2 solubility in liquid hydrocarbons are not abundant. Because it is challenging to experimentally determine the oxygen in hydrocarbons following traditional titration method as reagents react with hydrocarbons. In the current study, the O2 solubility was measured using a differential pressure-based measurement method in n-heptane, n-decane, n-dodecane, n-tetradecane, n-hexadecane, and tetralin at 294 K. Henry constants were calculated and were in the range 0.03–0.40 mol‧m−3‧kPa−1. At 140 kPa O2 pressure, in n-tetradecane and n-hexadecane O2 solubility was in the range 4–24 mol‧m−3, compared to O2 solubility in n-heptane and n-decane which was in the range 27–57 mol‧m−3. The O2 solubility expressed as a mole fraction of the total liquid appeared to have a slightly decreasing trend with an increase in carbon number in the alkanes.