کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
582172 1453165 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Supercritical water oxidation of wastewater from acrylonitrile manufacturing plant
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Supercritical water oxidation of wastewater from acrylonitrile manufacturing plant
چکیده انگلیسی
The wastewater from an acrylonitrile manufacturing plant, which is difficult to biodegrade, was decomposed in subcritical and supercritical water. Experiments were carried out at temperature ranging from 299 to 552 °C and a pressure of 25 MPa. The initial total organic carbon (TOC) of acrylonitrile wastewater was set from 0.27 to 2.10 mol L−1 with residence times ranging from 3 to 30 s. 30 wt.% H2O2 solution was used as an oxidant with the stoichiometric ratios of O2 based on the initial TOC concentration ranging from 0.5 to 2.5. TOC conversion increased with increasing reaction temperature and residence time, however, beyond the stoichiometric oxygen-TOC ratio of 1:1, TOC conversion was barely affected by excess oxygen. The initial TOC concentration of acrylonitrile wastewater also had a negligible effect on TOC conversion. An assumed pseudo-first-order global rate expression was determined with an activation energy of 53.48(±33.57) kJ mol−1 and a pre-exponential factor of 5.22(±1.74) × 102 s−1. By considering the dependence of the reaction rate on TOC and O2 concentration, a global rate expression was regressed from the complete set of 64 data points. The resulting activation energy was 66.33(±5.87) kJ mol−1; the pre-exponential factor was 6.07(±6.89) × 103 mol−0.26 s−1; and the reaction orders for initial TOC and O2 concentration were 1.26(±0.15) and 0.00(±0.15), respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 163, Issues 2–3, 30 April 2009, Pages 1142-1147
نویسندگان
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