Membrane-Based Air Dehumidification Using Organic Ionic Liquid Desiccant: Paper No. 023

Bamdad Bahar, Harish Opadristha, Mark Stutman, Xiaobing Liu, Jason Woods

Research output: Contribution to conferencePaper


Membrane Ionic Liquid Desiccant Air Dehumidification (MILDAD) is a promising alternative to conventional dehumidification systems that employ mechanical compressors and refrigerant-based cooling with evaporator and condensing coils. However, its application has been limited due to high manufacturing and installation cost, durability issues, concerns with corrosion due to leakage and salt carry over into the downstream air and onto surfaces. This paper reviews substantial progress made with new systems based on combining advanced ionic membranes that are pressure resistant, thin walled with high water permeability, and non-porous with synthetic organic, non-crystalline ionic liquid desiccants. Alternative design configurations are discussed comparing cross flow shell-and-tube membrane contactors employing ionic membrane tubes through which ionic liquid desiccant air flows. Performance data for MILDAD prototypes is provided. Dehumidification of the incoming supply airstream and regeneration into exhausted building air is demonstrated. The latent effectiveness of the MILDAD system will be discussed along with some future steps to improve performance of the system.
Original languageAmerican English
Number of pages11
StatePublished - 2021
Event13th IEA Heat Pump Conference - Jeju, Korea
Duration: 11 May 202014 May 2020


Conference13th IEA Heat Pump Conference
CityJeju, Korea

NREL Publication Number

  • NREL/CP-5500-81001


  • ionic liquid desiccants
  • membrane
  • pervaporation


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