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<p>The catalytic effects of two water-soluble polymers, polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), on the oxidation kinetics of acetylsalicylic acid by potassium permanganate in the presence of sulfamic acid were examined for the first time. The progress of the oxidation reaction in acidic aqueous solutions was monitored using a spectrophotometric method. The kinetic experiments were conducted under pseudo-first-order reaction conditions with respect to the oxidant. The current study confirmed that the oxidation reaction follows first-order kinetics for [potassium permanganate] and fractional orders for [acetylsalicylic acid] and [hydrogen ion]. Additionally, the reaction rate constants significantly increased in the presence of PVA and PVP. Consequently, Piszkiewicz’s cooperativity and Benesi-Hildebrand equations were effectively applied to the kinetic data to explain the catalytic behaviour of these polymers. The activation energy, enthalpy, and entropy of the studied reaction were determined using Arrhenius and Eyring equations. A plausible mechanism and rate law consistent with the kinetic data were proposed.</p>

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Polyvinyl Alcohol and Polyvinylpyrrolidone as Efficient Catalysts for the Reaction of Acetylsalicylic Acid with Potassium Permanganate in Sulfamic Acid Medium

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Adnan A. Dahadha,
  • Mohammad Abunuwar,
  • Fatina W. Dahadhah,
  • Abdel Naser Dakkah,
  • Mohammad Al-dhoun

摘要

The catalytic effects of two water-soluble polymers, polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), on the oxidation kinetics of acetylsalicylic acid by potassium permanganate in the presence of sulfamic acid were examined for the first time. The progress of the oxidation reaction in acidic aqueous solutions was monitored using a spectrophotometric method. The kinetic experiments were conducted under pseudo-first-order reaction conditions with respect to the oxidant. The current study confirmed that the oxidation reaction follows first-order kinetics for [potassium permanganate] and fractional orders for [acetylsalicylic acid] and [hydrogen ion]. Additionally, the reaction rate constants significantly increased in the presence of PVA and PVP. Consequently, Piszkiewicz’s cooperativity and Benesi-Hildebrand equations were effectively applied to the kinetic data to explain the catalytic behaviour of these polymers. The activation energy, enthalpy, and entropy of the studied reaction were determined using Arrhenius and Eyring equations. A plausible mechanism and rate law consistent with the kinetic data were proposed.