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J Hazard Mater

Title:		Absorption and desorption of gaseous toluene by an absorbent microcapsules column
Author(s):		Xiang Z; Lu Y; Gong X; Luo G;
Address:		"State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China"
Journal Title:		J Hazard Mater
Year:		2010
Volume:		20090822
Issue:		1-Mar
Page Number:		243 - 248
DOI:		10.1016/j.jhazmat.2009.08.075
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Heavy solvents absorption appears to be very attractive in recovering of volatile organic compounds (VOCs) from industrial tail gas. Their high viscosities make good dispersion required but difficult to reduce mass transfer resistance. Microencapsulation techniques provide a candidate solution. In this paper, vapor pressures for toluene+poly(dimethylsiloxane) (PDMS) mixtures were measured at temperature ranging from 273.2K to 343.2K. Polyacrylonitrile (PAN) hollow microspheres, prepared by orifice dispersion plus solvent extraction method, was used to immobilize PDMS. The capacity was adjusted from 2.3g to 9.3g PDMS/g PAN by addition of cyclohexane in PDMS during solvent impregnation. The breakthrough curves of column packed with PDMS/PAN microcapsules were determined, indicating shapes close to ideality, high absorption efficiencies and considerable absorption capacities before breakthrough. The influence of operational temperature, concentration of feed and gas feed flow rate on the absorption process were investigated as well. A mathematical model, suitable for dilute gas absorption process, was used to simulate the breakthrough curves. This model has proved to be useful to fit curves and analyze the absorption kinetics of PDMS/PAN microcapsules column. After absorption, the column can be regenerated completely by gas stripping. Enrichment of toluene was founded by increasing desorption temperature. Through absorption and desorption by turns, the stability of PDMS/PAN microcapsules column was verified"
Keywords:		"Absorption Capsules Gases Indicators and Reagents Kinetics Microscopy, Electron, Scanning Particle Size Thermodynamics Toluene/chemistry/*isolation & purification Viscosity Waste Disposal, Fluid;"
Notes:		"MedlineXiang, Ziying Lu, Yangcheng Gong, Xingchu Luo, Guangsheng eng Research Support, Non-U.S. Gov't Netherlands 2009/09/08 J Hazard Mater. 2010 Jan 15; 173(1-3):243-8. doi: 10.1016/j.jhazmat.2009.08.075. Epub 2009 Aug 22"