New experimental method for the determination of single-component isotherms: an application of the flow-rate retention time

M.J. Heslop, G. Mason, B.A. Buffham, A. McDonald, R. Low

Research output: Contribution to journalArticle

Abstract

In this paper, we investigate adsorption of a single component (refrigerant) from the variation in the flow rate leaving the column. This requires evaluation of the flow-rate retention time-a measure of the net change in the amount adsorbed in the column, which can be positive or negative. The arrangement includes a system to deliver a fixed flow (30 mL/min) of helium through a column packed with 0.05 g of adsorbent. An experiment is initiated by adding a flow of refrigerant to the helium, and monitoring the outlet flow rate from the column. There are two main advantages of this approach: the experimental times are short (the order of 10 minutes) and the sensitivity is very high so that it can be used with very small as well as large amounts of adsorbent. Indeed, a sensitivity analysis suggests that the resolution is of the order of 10−5 g. The first results section considers the corrections required to the measured flow-rate retention time-these are small and determined by empty volume in the system. The second results section involves a determination of the adsorption isotherm of HFC-134A on an activated carbon at 35 °C up to a partial pressure of 0.25 bar. © Springer.
Original languageEnglish
Pages (from-to)653-663
Number of pages11
JournalAdsorption
Volume14
Issue number4-5
DOIs
Publication statusPublished - Oct 2008

Keywords

  • adsorption
  • activated carbon
  • HFC-134A
  • isotherm
  • flow rate

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