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Title: Analytical supercritical fluid extraction of adsorbent materials

The use of supercritical fluids for the analytical extraction of semivolatile and higher molecular weight materials from various adsorbent and particulate matrices was investigated. Instrumentation was designed to allow gram quantities of the matrix to be extracted at pressures up to 400 bar and temperatures to 235 /sup 0/C with collection of the effluent in a sealed liquid-nitrogen-cooled flask. Carbon dioxide, isobutane, and methanol modified (20 mol %) carbon dioxide fluid systems were evaluated and compared to liquid Soxhlet extraction. Supercritical fluid extraction (SFE) provided very rapid (approx. =30 min) extraction with comparable efficiency to the Soxhlet methods, and both more rapid and more efficient extractions appear feasible. The more polar carbon dioxide-methanol fluid system gave higher extraction efficiencies for the more polar adsorbates and the isobutane system was more efficient for the higher molecular weight and less polar compounds.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
7006321
DOE Contract Number:
AC06-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Anal. Chem.; (United States); Journal Volume: 59:1
Research Org:
Pacific Northwest Lab., Richland, WA
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 2-METHYLPROPANE; SOLVENT PROPERTIES; AIR; SOLVENT EXTRACTION; CARBON DIOXIDE; METHANOL; PARTICULATES; POLYCYCLIC AROMATIC HYDROCARBONS; EFFICIENCY; EXPERIMENTAL DATA; HIGH PRESSURE; HIGH TEMPERATURE; ALCOHOLS; ALKANES; AROMATICS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; DATA; EXTRACTION; FLUIDS; GASES; HYDROCARBONS; HYDROXY COMPOUNDS; INFORMATION; NUMERICAL DATA; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PARTICLES; SEPARATION PROCESSES 400105* -- Separation Procedures