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5167413 
Journal Article 
Pressurized hot water extraction of benzoic acid and phthalic anhydride from petrochemical wastes using a modified supercritical fluid extractor and a central composite design for optimization 
Kamali, H; Ghaziaskar, HS 
2010 
Yes 
Journal of Supercritical Fluids
ISSN: 0896-8446 
ELSEVIER SCIENCE BV 
AMSTERDAM 
54 
1 
16-21 
English 
WOS:000279364700003 
Using the pressurized hot water extraction technique, benzoic acid and phthalic anhydride were selectively removed from solid petrochemical wastes (called molten phthalic anhydride). A statistical experimental design based on "central composite design" was applied for obtaining optimized conditions for the semi-continuous extraction of phthalic anhydride and benzoic acid from their mixture with benzoic acid, maleic acid, phthalic acid, phthalic anhydride, aldehydes, phthaldehyde, toluic acid, and some minor impurities. Variables such as pressure (60-220 bar), temperature (60-140 degrees C), dynamic time (5-45 min), and flow rate (0.2-1 mL/min) were used. (C) 2010 Elsevier B.V. All rights reserved. 
Chemistry; Engineering; Pressurized hot water extraction, Phthalic anhydride, Benzoic acid,; Selectivity, Extraction yield, Molten phthalic anhydride; carbon-dioxide, solubility