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Gas‐Liquid‐Solid Reactions of Polyvinyl Alcohol on Oxidation Treatments for Environmental Pollution Remediation
Author(s) -
Silva Adrián M. T.,
Vaz Ricardo N. P.,
QuintaFerreira Rosa M.,
Levec Janez
Publication year - 2003
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450810331
Subject(s) - polyvinyl alcohol , catalysis , chemistry , environmental remediation , formic acid , liquid phase , adsorption , wet oxidation , oxygen , leaching (pedology) , chemical engineering , inorganic chemistry , nuclear chemistry , organic chemistry , contamination , ecology , physics , environmental science , soil water , soil science , engineering , biology , thermodynamics
Polyvinyl alcohol (PVA) oxidation in liquid‐phase was studied in a batch high‐pressure reactor at 140 to 240°C and 0.7 MPa oxygen partial pressure. The two‐phase (gas‐liquid) non‐catalytic wet oxidation was compared with a three‐phase system (gas‐liquid‐solid) using CuO‐ZnO/Al 2 O 3 and Mn‐Ce‐O oxides catalysts. This study pointed out oxidation processes as quite promising technologies for industrial effluents containing PVA, leading to high reductions in PVA and total organic carbon (TOC) levels. Catalysts showed high activity at 180°C and carbon adsorption was not observed; Mn‐Ce‐O showed significant leaching to the liquid‐phase, compared with CuO‐ZnO/Al 2 O 3 . Acetic and formic acids were detected as refractory compounds for oxidation.