Mol oranı, sıcaklık ve su içeriğin Kolin Klorür-Etilen Gliserolden üretilen derin ötektik çözücülerin asitliğine ve viskozitesine etkileri

Abstract

Derin ötektik çözücüler (DÖÇ) kendilerine özgü özellikleri ve sahip oldukları doğaya dost yapıları her geçen gün daha çok tercih edilmelerini sağlamaktadır. Etkin kullanılmaları için özelliklerinin değerlendirilmesi önem arz etmektedir. Her ne kadar klasik çözücülere karşı iyi alternatif olmalarına karşın yüksek viskoziteleri bu çözücülerin endüstride kullanımlarını kısıtlamaktadır. Ama bu durum yardımcı çözücü katılarak veya operasyon şartlarının düzenlenmesiyle aşılabilinmektedir. Bu çalışmada, 200C- 600C arasında değişen sıcaklık (293.15-333.15 K), mol oranı (1:1- 1:9) ve yardımcı çözücü katımının derin ötektik çözücünün asitliği ve viskozitesi üzerindeki etkisi incelenmiştir. Genel olarak, bu çalışma sonucu olarak ortam şartları DÖÇ’lerin asitlikleri ve viskoziteleri üzerinde önemli etki göstermiştir. DÖÇ’lerin asitliği ve viskozitesi mol oranı arttıkça azalmış, sıcaklık artışı DÖÇ’lerin viskozitesini olumsuz olarak etkilemiştir. DÖÇ’lerin viskozitelerindeki sıcaklık bağlantılı değişim göstermiş, bu da Vogel-Fulcher-Tammann eşitliğine uyumluluk göstermektedir. Yardımcı çözücü (su) ilavesi DÖÇ’lerin viskozitelerini düşürmüştür. 25%’den fazla su ilavesi viskozitede önemli bir değişim oluşturmamıştır. Ayrıca 1:5 mol oranına dek ek çözücü ilavesi asitliği azaltmıştır, fakat ilave edilen su miktarı asitlik üzerinde anlamlı değişim oluşturmamıştır. Sonuçlar gıda endüstri uygulamalarında kullanılmak için tasarlanan DÖÇ mekanızması hakkında yeni bir bakış açısı sağlamaktadır.

Keywords

• Derin ötektik çözücü
• sıcaklık
• fizikokimyasal özellik
• asitlik
• viskozite

Effects of molar ratio, temperature and water content on acidity and viscosity of deep eutectic solvent formed from Choline Chloride-Ethylene Glycerol

Abstract

Deep eutectic solvents (DESs) become preferred solvents owing to unique features and promising environmentally friendly nature they have. Evaluation their properties is essential in order to use them effectively. Even though DESs are a good alternative to classic solvents, their viscosity is high, limiting their usage in industrial applications. However, this can be overcome by adding cosolvent or varying application conditions. In this study, the effect of temperature ranging from 200C to 600C (293.15- 333.15 K), molar ratio (1:1 to 1:9) and cosolvent addition (water) on acidity and viscosity of DES were investigated. Overall, as a result of this study, operation conditions had a significant effect on acidity and viscosity of DESs. Acidity and viscosity of DESs were on decrease as molar ratio increased, and the increase in temperature negatively affected viscosity of DESs. Dynamic viscosity of DESs were temperature dependence, following Vogel-Fulcher-Tammann (VFT) equality. Cosolvent addition decreased viscosity of DESs. Addition of water higher than 25% did not have a significant effect on viscosity. In addition, water addition decreased acidity of DES up to 1:5 molar ratio, but no significant effect regardless of the amount of water addition on the acidity was determined. These results provide a new perceptive about the mechanism of DES designed for usage in food applications.

Keywords

• Deep eutectic solvent
• Temperature
• Physicochemical properties
• acidity
• viscosity

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