Ionic Liquid / CO2 Co-Fluid Refrigeration: CO2 Solubility Modeling and Life Cycle Analysis

Doctoral Dissertation

Abstract

Improving our current refrigeration systems is important from an energy standpoint as well as from an environmental standpoint. One method of improving our refrigeration systems is developing new working fluids that reduce the energy required for operation, and have less of an environmental impact. One of the possible types of working fluids that displays a great deal of potential is a mixture involving CO2 (the refrigerant) and an ionic liquid (the co-fluid). The ionic liquid co-fluid greatly reduces the pressure that would be required if CO2 alone was used. To identify appropriate ionic liquids, two important aspects are the properties of ionic liquid / CO2 mixtures and the potential environmental impact of the ionic liquid / CO2 co-fluid refrigeration system over its entire life cycle. In this work properties of various ionic liquids are modeled using the SAFT equation of state. This modeling has been done for both pure component and CO2 solubility and it shows the effects of impact of the association term for these
compounds in regards to the goodness of fit. Furthermore properties of untested ionic liquids are predicted using the same model. Synthesis routes are also predicted for the
synthesis of both 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and trihexyl(tetradecyl)phosphonium 1,2,3-triazolide. From these synthesis routes, and from an estimation of the refrigeration systems theoretical efficiencies, environmental impacts can be determined and analyzed.

Attributes

Attribute NameValues
URN
  • etd-09232013-180135

Author Jared Edgar Peterson
Advisor Paul McGinn
Contributor Davide Hill, Committee Member
Contributor Edward Maginn, Committee Member
Contributor Mark Stadtherr, Committee Member
Contributor Joan Brennecke, Committee Member
Contributor Paul McGinn, Committee Chair
Degree Level Doctoral Dissertation
Degree Discipline Chemical Engineering
Degree Name PhD
Defense Date
  • 2013-09-23

Submission Date 2013-09-23
Country
  • United States of America

Subject
  • [P66614][3 triazolide]

  • PC-SAFT

  • [hmim][Tf2N]

Publisher
  • University of Notre Dame

Language
  • English

Record Visibility and Access Public
Content License
  • All rights reserved

Departments and Units

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