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Purification of Ionic Liquid [mTBDH][OAc] Utilizing the Short-Path Distillation Technique.

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Purifying the ionic liquid [mTBDH]-[OAc] is crucial for sustainable textile production. Short path distillation effectively recovers the base mTBD, achieving high purity and minimizing waste.

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Area of Science:

  • Textile Chemistry
  • Green Chemistry
  • Chemical Engineering

Background:

  • The Ioncell process uses ionic liquids (ILs) for sustainable textile production.
  • Impurities in ILs negatively impact cellulose dissolution and process efficiency.
  • Purification of the IL 7-Methyl-1,5,7-triazabicyclo[4.4.0]-dec-5-enium acetate ([mTBDH]-[OAc]) is essential for process sustainability.

Purpose of the Study:

  • To investigate the purification of [mTBDH]-[OAc] in the presence of various impurities.
  • To understand IL-impurity interactions for effective base recovery and IL purification.
  • To optimize purification conditions for a closed-loop Ioncell process.

Main Methods:

  • Utilized short path distillation (SPD) to purify [mTBDH]-[OAc].
  • Introduced impurities including KCl, NaCl, CaCl2, lactic acid, xylan, and hydrolysis products (H-mTBD-1, H-mTBD-2).
  • Varied feed flow rate during SPD to assess the recovery of the base 7-Methyl-1,5,7-triazabicyclo(4.4.0)-dec-5-ene (mTBD).

Main Results:

  • Highest recovery fractions (0.97-1.00) of mTBD were achieved at the lowest flow rate (0.378 kg/h).
  • Approximately 75-100% of the base mTBD was recovered under most experimental conditions.
  • SPD effectively removed inorganic salts (K, Na, Ca), xylan, and lactic acid from the IL feed.

Conclusions:

  • Short path distillation is an effective method for purifying [mTBDH]-[OAc] for the Ioncell process.
  • Optimized SPD conditions enable high recovery of the valuable base mTBD.
  • This purification strategy enhances the sustainability of IL-based textile production by minimizing waste and maximizing resource utilization.