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Phase Behavior of Liquid Crystals With CO2

Phase Behavior of Liquid Crystals With CO2

Mariëtte de Groen, Thijs J H Vlugt, Theo W de Loos

J Phys Chem B. 2012 Aug 2;116(30):9101-6.

PMID: 22731661

Abstract:

Liquid crystals are being considered as novel process solvents for CO(2) capture. The solubility of CO(2) is higher in the isotropic phase than in the structured (e.g., nematic) phase. CO(2) can be captured in the isotropic phase, and regeneration of the solvent is achieved by cooling down the mixture a few degrees until a phase transition to the structured phase occurs. This CO(2) capture process has the potential to consume less energy than the conventional amine-based processes. To address the potential of liquid crystals to efficiently capture CO(2), experimentally obtained P,T-phase diagrams of five liquid crystals with 5 mass % CO(2) are reported. The liquid crystals used in this study are 4'-(pentyloxy)-4-biphenylcarbonitrile, 4'-pentyl-4-biphenylcarbonitrile, 4-ethyl-4'-propyl-bicyclohexyl, 4-propyl-4'-butyl-bicyclohexyl, and 4'-(octyloxy)-4-biphenylcarbonitrile. It is found that a weakly polar liquid crystal had a higher CO(2) solubility than apolar and more polar liquid crystals.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP40817081	4′-Pentyl-4-biphenylcarbonitrile		40817-08-1	Price
AP52364713	4′-(Pentyloxy)-4-biphenylcarbonitrile		52364-71-3	Price

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