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J Hazard Mater

Title:		Hazardous dichloromethane recovery in combined temperature and vacuum pressure swing adsorption process
Author(s):		Ramalingam SG; Saussac J; Pre P; Giraudet S; Le Coq L; Le Cloirec P; Nicolas S; Baudouin O; Dechelotte S; Medevielle A;
Address:		"Ecole des Mines de Nantes, GEPEA, UMR-CNRS 6144, Nantes, France. shivaji.ramalingam@yahoo.co.in"
Journal Title:		J Hazard Mater
Year:		2011
Volume:		20111008
Issue:
Page Number:		95 - 102
DOI:		10.1016/j.jhazmat.2011.10.019
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Organic vapors emitted from solvents used in chemical and pharmaceutical processes, or from hydrocarbon fuel storage stations at oil terminals, can be efficiently captured by adsorption onto activated carbon beds. To recover vapors after the adsorption step, two modes of regeneration were selected and could be possibly combined: thermal desorption by hot nitrogen flow and vacuum depressurization (VTSA). Because of ignition risks, the conditions in which the beds operate during the adsorption and regeneration steps need to be strictly controlled, as well as optimized to maintain good performances. In this work, the optimal conditions to be applied during the desorption step were determined from factorial experimental design (FED), and validated from the process simulation results. The regeneration performances were compared in terms of bed regeneration rate, concentration of recovered volatile organic compounds (VOC) and operating costs. As an example, this methodology was applied in case of dichloromethane. It has been shown that the combination of thermal and vacuum regeneration allows reaching 82% recovery of dichloromethane. Moreover, the vacuum desorption ended up in cooling the activated carbon bed from 93 degrees C to 63 degrees C and so that it significantly reduces the cooling time before starting a new cycle"
Keywords:		"Adsorption Equipment Design Hazardous Substances/*isolation & purification Methylene Chloride/*isolation & purification Models, Theoretical Pressure Vacuum Volatile Organic Compounds/analysis/isolation & purification;"
Notes:		"MedlineRamalingam, Shivaji G Saussac, Jerome Pre, Pascaline Giraudet, Sylvain Le Coq, Laurence Le Cloirec, Pierre Nicolas, Serge Baudouin, Olivier Dechelotte, Stephane Medevielle, Alice eng Research Support, Non-U.S. Gov't Validation Study Netherlands 2011/11/01 J Hazard Mater. 2011 Dec 30; 198:95-102. doi: 10.1016/j.jhazmat.2011.10.019. Epub 2011 Oct 8"