Degradation of gas-phase propylene glycol monomethyl ether acetate by ultraviolet/ozone process: A kinetic study.
A pilot-scale plug-flow reactor was built to investigate its performance in treating airborne propylene glycol monomethyl ether acetate (PGMEA) via ozonation, ultraviolet (UV) photolysis and UV/O3 technologies. Governing factors, such as the initial molar ratio of ozone (O3) to PG-MEA, UV volumetric electric power input, and moisture content in the influent airstream, were investigated. A 1-L batch reactor was used to investigate some photodegradation characteristics of PGMEA in advance. Experiments were conducted at a fixed influent PGMEA concentration of approximately 50 ppm and an ambient temperature of 26 degrees C. A gas space time of 85 sec in the plug-flow reactor was kept for either ozonation or photolysis reaction, whereas a gas space time of 170 sec was used for the UV/O3 degradation. Results show that an initial molar ratio of O3 to PGMEA of >2.91 and an UV volumetric electric input power of 0.294 W/L(-1) sufficed to obtain PGMEA decompositions of >90% by UV/O3. Kinetic analyses indicate that all types of PGMEA decomposition are pseudo-first order with respect to its concentration. Moisture content (relative humidity = 15-99%) and UV volumetric electric input power (0.147 and 0.294 W/L(-1)) were major factors that strongly affect the PGMEA degradation rate.
Chou
Ming-Shean
MS
Institute of Environmental Engineering, National Sun Yat-Sen University, Taiwan, Republic of China. ms.chou@msa.hinet.net
Huang
Bo-Jen
BJ
Chang
Hsiao-Yu
HY
D000393:Air Pollutants / Q000737:chemistry / Q000528:radiation effects; D000397:Air Pollution / Q000517:prevention & control; D006813:Humidity; D007220:Industrial Waste / Q000517:prevention & control; D007700:Kinetics; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D010782:Photolysis; D011409:Propylene Glycols / Q000737:chemistry* / Q000528:radiation effects*; D012997:Solvents / Q000737:chemistry / Q000528:radiation effects; D014466:Ultraviolet Rays; D018505:Waste Management / Q000379:methods*
D000393:Air Pollutants; D007220:Industrial Waste; D011409:Propylene Glycols; D012997:Solvents; C502307:propylene glycol methyl ether acetate; D010126:Ozone