title: Decomposition and Mineralization of Dimethyl Phthalate in an Aqueous Solution by Wet Oxidation.
abstract: Dimethyl phthalate (DMP) was treated via wet oxygen oxidation process (WOP). The decomposition efficiency η DMP of DMP and mineralization efficiency η TOC of total organic carbons were measured to evaluate the effects of operation parameters on the performance of WOP. The results revealed that reaction temperature T is the most affecting factor, with a higher T offering higher η DMP and η TOC as expected. The η DMP increases as rotating speed increases from 300 to 500 rpm with stirring enhancement of gas liquid mass transfer. However, it exhibits reduction effect at 700 rpm due to purging of dissolved oxygen by overstirring. Regarding the effects of pressure P T, a higher P T provides more oxygen for the forward reaction with DMP, while overhigh P T increases the absorption of gaseous products such as CO2 and decomposes short-chain hydrocarbon fragments back into the solution thus hindering the forward reaction. For the tested P T of 2.41 to 3.45 MPa, the results indicated that 2.41 MPa is appropriate. A longer reaction time of course gives better performance. At 500 rpm, 483 K, 2.41 MPa, and 180 min, the η DMP and η TOC are 93 and 36%, respectively.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Dar-Ren
authors.initials: DR
authors.lastname: Ji
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Chia-Chi
authors.initials: CC
authors.lastname: Chang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Shih-Yun
authors.initials: SY
authors.lastname: Chen
authors.affiliation: Department of Cosmetic Science and Application, Lan Yang Institute of Technology, Yilan 261, Taiwan.
authors.forename: Chun-Yu
authors.initials: CY
authors.lastname: Chiu
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Jyi-Yeong
authors.initials: JY
authors.lastname: Tseng
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan ; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ching-Yuan
authors.initials: CY
authors.lastname: Chang
authors.affiliation: Department of Environmental Science and Engineering, Tunghai University, Taichung 407, Taiwan.
authors.forename: Chiung-Fen
authors.initials: CF
authors.lastname: Chang
authors.affiliation: Chemical Engineering Division, Institute of Nuclear Energy Research, Atomic Energy Council, Lungtan, Taoyuan 325, Taiwan.
authors.forename: Sheng-Wei
authors.initials: SW
authors.lastname: Chiang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Zang-Sie
authors.initials: ZS
authors.lastname: Hung
authors.affiliation: Department of Environmental Engineering, National Ilan University, Yilan 260, Taiwan.
authors.forename: Je-Lueng
authors.initials: JL
authors.lastname: Shie
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan.
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan ; Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan.
authors.forename: Min-Hao
authors.initials: MH
authors.lastname: Yuan
mesh_terms: D006863:Hydrogen-Ion Concentration; D008903:Minerals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010795:Phthalic Acids / Q000737:chemistry*; D011312:Pressure; D012399:Rotation; D012996:Solutions; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D008903:Minerals; D010795:Phthalic Acids; D012996:Solutions; D014867:Water; C024629:dimethyl phthalate; D010100:Oxygen