Han Seung Ho, Veriansyah Bambang, Kim Jae-Duck, Lee Jong-Chol
Supercritical Fluid Research Laboratory, Korea Institute of Science and Technology, Seoul, Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2007 Dec;42(14):2105-9. doi: 10.1080/10934520701627090.
The oxidation rate of pentachlorophenol, [C(6)HCl(5)O] which is used to control termites and as a general herbicide and also as the probable human's carcinogen, was investigated in an isothermal continuous tubular reactor under supercritical water oxidation (SCWO) conditions. The experiments were conducted at a temperature of 400-550 degrees C and a fixed pressure of 25 MPa, with a residence time that ranged from 6 s to 26 s. The conversion of PCP was monitored by analyzing total organic carbon (TOC) on the liquid effluent samples. The initial TOC concentrations of PCP were varied from 0.74 mmol/L to 2.91 mmol/L and the oxygen concentrations were varied from 0.46 mmol/L to 3.52 mmol/L. By taking into account the dependence of the oxidant and TOC concentration on the reaction rate, a global PCP oxidation rate was regressed from the data of 48 experiments, to a 95% confidence level. The resulting activation energy was determined to be 43.56 +/- 1.47 kJ/mol, and the pre-exponential factor was (1.92 +/- 0.46) x 10(2) L(1.16) mmol(-0.16) s(-1). The reaction orders for the PCP (based on TOC) and the oxidant were 0.74 +/- 0.02 and 0.42 +/- 0.05, respectively.
五氯苯酚[C(6)HCl(5)O]被用作白蚁防治剂、通用除草剂，也是可能的人类致癌物，本文研究了超临界水氧化（SCWO）条件下其在等温连续管式反应器中的氧化速率。实验在400 - 550℃的温度和25MPa的固定压力下进行，停留时间为6 - 26秒。通过分析液体流出物样品中的总有机碳（TOC）来监测五氯苯酚的转化率。五氯苯酚的初始TOC浓度在0.74 mmol/L至2.91 mmol/L之间变化，氧气浓度在0.46 mmol/L至3.52 mmol/L之间变化。考虑到氧化剂和TOC浓度对反应速率的依赖性，从48次实验数据中回归得到了五氯苯酚的整体氧化速率，置信水平为95%。结果确定活化能为43.56±1.47 kJ/mol，指前因子为(1.92±0.46)×10(2) L(1.16) mmol(-0.16) s(-1)。五氯苯酚（基于TOC）和氧化剂的反应级数分别为0.74±0.02和0.42±0.05。
