Hydrothermal decomposition of pentachlorophenol in subcritical and supercritical water with sodium hydroxide addition

作     者：PRABOWO Benedictus VERIANSYAH Bambang KIM Jae-Duck 

作者机构：Supercritical Fluid Research LaboratoryKorea Institute of Science and Technology(KIST)-Department of Green Process and System EngineeringUniversity of Science and Technology(UST)39-1 Hawolgok-dongSeoungbuk-gu Seoul136-791Korea. 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2007年第19卷第6期

页      面：663-666页

核心收录：

学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Project supported by Korea Institute of Science and Technology 

主　　题：pentachlorophenol hydrothermal decomposition supercritical water suberitical water 

摘      要：Hydrothermal decomposition of pentachlorophenol （PCP, C6HC150）, as the probable human carcinogen, was investigated in a tubular reactor under subcritical and supercritical water with sodium hydroxide （NaOH） addition. The experiments were conducted at a temperature range of 30（0-420℃ and a fixed pressure of 25 MPa, with a residence time that ranged from 10 s to 70 s. Under the reaction conditions, the initial PCP concentrations were varied from 0.25 to 1.39 mmol/L, and the NaOH concentrations were varied from 2.5 to 25 times of the concentrations of PCP. The result of this study showed that PCP conversion in supercritical water was highly dependent on the reaction temperature, residence time, and NaOH concentration. PCP conversion in subcritical water is, however, only dependent on reaction temperature. NaOH concentration and residence times were found to have little effect on PCP conversion in subcritical condition. It was found that NaOH concentration affected the dechlorinations of PCP in the supercritical water. The intermediates detected were proposed to be tetrachlorophenol and trichlorophenol, respectively.