Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Solubility of p-t-Butylcalixarenes in Supercritical Carbon dioxide: A Comparison of Static and Dynamic Measurement Techniques

Published

Author(s)

B F. Graham, A F. Lagalante, Thomas J. Bruno, J M. Harrowfield, R D. Trengove

Abstract

The solubilities of p-t butylcalix[n]arenes (n = 4,6, 8) and calix[4]arene have been measured in supercritical carbon dioxide. Solubility measurements were conducted in a high pressure cell with in situ spectrophotometric detection. Measurements were taken over the ranges of 10 to 20 Mpa and 40 to 60 C. The p-t butylcalix[4]arene showed solubility approximately 10 fold higher than both p-t-butylcalix[6]arene and p-t-butylacalix[8]arene with a maximum measured solubility over the studied pressure and temperature ranges of 1.84 x 10-5 mol/1. A comparison of these results with measurements made with a commercially available analytical SFE unit for p-t -butycalix[4]arene showed less than 10% deviation between the two sets of data over a common range of conditions. The SFE unit allows measurements to be made over significantly wider ranges of pressure and temperature than are currently available using the solubility cell.
Citation
Fluid Phase Equilibria
Volume
150-151

Keywords

carbon dioxide, p-t-butylcalixarenes, Solid-fluid equilibria, spectroscopy, supercritical

Citation

Graham, B. , Lagalante, A. , Bruno, T. , Harrowfield, J. and Trengove, R. (1998), Solubility of p-t-Butylcalixarenes in Supercritical Carbon dioxide: A Comparison of Static and Dynamic Measurement Techniques, Fluid Phase Equilibria (Accessed April 14, 2024)
Created November 30, 1998, Updated October 12, 2021