مطالعه اثر نمک کولین کلرید بر محلول آبی مایعات یونی مبتنی بر ایمیدازولیوم با اندازه گیری های ایزوپیستیکی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

1 گروه شیمی، دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران

2 گروه شیمی -دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران

چکیده

در این کار، رفتار تعادل مایع-بخار سیستم های سه تایی آبی شامل کولین کلرید (ChCl) و مایعات یونی مبتنی بر ایمیدازولیوم، به روش ایزوپیستیک، در دمای ◦C ۲۵ مورد بررسی قرار گرفته است. مایعات یونی مورد استفاده ۱-بوتیل۳-متیل ایمیدازولیوم برمید [C4mim][Br] و ۱-بوتیل۳-متیل ایمیدازولیوم تری فلوئورومتان سولفونات [C4mim][CF3SO3] هستند. اثر آنیون مایع یونی بر فعالیت آب، فشار بخار، و غلظت های تعادلی ایزوپیستیکی ارزیابی شده است. انحراف منحنی های هم فعالیت آب از رابطه خطی ایزوپیستیکی به عنوان معیاری برای پی بردن به اثر نمک زدایی یا نمک افزونی ChCl بر محلول آبی مایعات یونی به کار رفته است. نتایج نشان می دهد که ChCl نقش کمک-حلال را در سیستم های مورد بررسی ایفا می کند و موجب افزایش حلالیت مایعات یونی در آب می شود که متناظر با وقوع پدیده نمک افزونی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study on the salting effect of choline chloride on aqueous solutions of imidazolium-based ionic liquids via the isopiestic measurements

نویسندگان [English]

  • Bakhtyar Rostamzadeh 1
  • Nosaibah Ebrahimi 1
  • Rahmat Sadeghi 2
1 Department of Chemistry, University of Kurdistan, Sanandaj, Iran
2 Department of Chemistry, University of Kurdistan, Sanandaj, Iran
چکیده [English]

In this work, the vapor-liquid equilibrium behavior of aqueous ternary systems composed of choline chloride (ChCl) and imidazolium-based ionic liquids has been investigated using the isopiestic method at 25 °C. The ionic liquids used are 1-butyl-3-methylimidazolium bromide ([C4mim][Br]) and 1-butyl-3-methylimidazolium trifluoromethane sulfonate ([C4mim][CF3SO3]). The effect of ionic liquid anion on water activity, vapor pressure, and isopiestic equilibrium concentrations has been evaluated. The deviation of water iso-activity curves from the linear isopiestic relation has been used as a benchmark to unveil the salting-out or salting-in effect of ChCl on the aqueous solution of ionic liquids. The results show that ChCl plays the role of co-solvent in the studied systems and increases the solubility of the ionic liquids in water, indicating the occurrence of the salting-in phenomenon.

کلیدواژه‌ها [English]

  • Choline Chloride
  • Imidazolium-based ionic liquids
  • Isopiestic
  • Salting-in effect

This is an open access article under the CC-BY-SA 4.0 license.( https://creativecommons.org/licenses/by-sa/4.0/)

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