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Dynamics of chelation‐supercritical fluid extraction from wood fibers
Author(s) -
AlJabari Maher
Publication year - 2004
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200401751
Subject(s) - supercritical fluid extraction , supercritical fluid , extraction (chemistry) , chemistry , elution , volumetric flow rate , solubility , chromatography , analytical chemistry (journal) , materials science , thermodynamics , organic chemistry , physics
The dynamics of supercritical fluid extraction (SFE) of the metal content of wood fibers chelated with lithium bis(trifluoroethyl) dithiocarbamate (FDDC) by supercritical (SF) CO 2 was investigated experimentally by monitoring the spectra of the eluted metal complex as a function of time. The characteristic shape of the dynamic SFE curve was determined mainly by the flow conditions in the extraction vessel, the mass transfer resistance in the SF phase, and the solubility. High extraction yields of metal content were obtained in two‐stage extraction including static (batch) and dynamic (semi‐batch) stages. Increasing the length of the static stage increased the rate of dynamic elution of metal complex until it approached the dynamics of fluid displacement for a continuous stirred tank reactor (CSTR). In such cases, increasing the flow rate had no effect on the dynamic extraction curve when it was plotted using dimensionless time. Efficient chelation‐SFE from wood fibers was obtained at a pressure of 20.3 MPa and with a static time of 30 min.