28.02.2013 Views

Handbook of Solvents - George Wypych - ChemTech - Ventech!

Handbook of Solvents - George Wypych - ChemTech - Ventech!

Handbook of Solvents - George Wypych - ChemTech - Ventech!

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

1442 Aydin K. Sunol and Sermin G. Sunol<br />

Purpose Supercritical medium Substrate<br />

Extraction <strong>of</strong> soils Nitrous oxide Aromatic amines, pesticides<br />

Extraction <strong>of</strong> soils Water<br />

Polymer processing<br />

Polycyclic-aromatic hydrocarbons<br />

6<br />

Removal <strong>of</strong> trace compounds<br />

CO 2<br />

Siloxane oligomer, cyclic trimer, organic<br />

compounds from plastic, carbon<br />

tetrachloride from polyisoprene<br />

21.1.3.2 Extraction - generic applications<br />

Liquid streams containing close-boiling and heat-labile component can be fractionated with<br />

the aid <strong>of</strong> supercritical fluids or valuable components <strong>of</strong> aqueous streams could be isolated<br />

and concentrated using supercritical solvents. Entrainers could also be added to the solvent<br />

to enhance the selectivity, particularly in fractionation instances. The main reason for using<br />

entrainers for concentration purposes is to enhance solubility. One can also use membranes<br />

along with supercritical fractionator. 68 Typical applications <strong>of</strong> this process technology are<br />

given in Table 21.1.7 and Table 21.1.8 while several review papers and texts provide useful<br />

design information. 69-72<br />

Table 21.1.7. Extraction applications <strong>of</strong> supercritical fluids<br />

Purpose Supercritical medium Substrate<br />

Food purification<br />

CO 2<br />

Food processing<br />

Oil purification<br />

Cholesterol removal from milk fat<br />

Flavor extraction CO 2 Beer, wine and fruit flavor concentrates<br />

Fractionation <strong>of</strong> food CO 2 Oil, milk fat<br />

Extraction <strong>of</strong> lignocellulosic<br />

materials and biomass<br />

CO 2,SO 2,N 2O, H 2O,<br />

methylamine, ethanol,<br />

ethylene<br />

Forest products<br />

Biochemical<br />

Medicinal compound CO 2 Fermentation broth<br />

Petrochemical<br />

Cellulose or ligno-cellulosic materials from wood<br />

or wood pulp<br />

Purifying liquid fuels CO 2 Deasphaltation, demetallization<br />

Waste water extraction 73<br />

Environmental<br />

CO2+entrainer Aqueous toxic wastes, phenol, metabolic wastes<br />

Purification <strong>of</strong> essential oils CO2 Essential oils<br />

Terpenes from orange, citrus and bergamot peel oil

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!