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초임계 물에 의한 페놀 폐수의 산화 특성

Oxidation Characteristics of Phenol-based Waste Water by Supercritical Water

HWAHAK KONGHAK, February 1998, 36(1), 92-97(6), NONE
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Abstract

관형 반응기를 이용하여 페놀 시험 폐수(500ppm)의 초임계 산화 반응 특성을 평가하였다. 산화 반응 조건(온도 : 300-440℃, 압력 : 180-290bar, 과잉산소백분율 0, 300, 600, 800%, 체류시간 : 0.7-11초 등)의 변화에 따른 페놀, 산소, 그리고, 물의 농도에 대한 산화 반응 차수와 속도상수 k를 결정하였다. 페놀의 전환율은 반응기내 반응물의 체류시간에 비례하는 것으로 나타났으며, 440℃의 온도에서 수행된 산화반응에서는 체류시간 약 5초에서 90%의 전환율을 나타내었다. 실험 영역에서 페놀의 산화는 1차 반응차수를 나타내었으며, 산소 농도에 대한 반응차수 b는 실험 조건에 따라 0.437±0.027의 값을 나타내었다. 물의 밀도가 산화반응에 영향을 주는 결과를 이해할 수 있는 반응차수 c는 반응 조건에 따라 0.653±0.027의 값을 나타내었다. 또한, 등압(240bar)하의 일정 온도 범위(300-440℃)에서 측정한 산화반응의 활성화에너지는 18.31 kcal/mol인 것으로 나타났다.
Supercritical water oxidation characteristics of aqueous phenol solution(500 ppm) was experimentally evaluated using a stainless steel 316 tubular-type reactor(0.21 cm ID x 34 cm L). The orders of reactions and rate constants with respect to the concentration of phenol, oxygen and water were determined under various oxidation conditions(i.e., temperatures : 300-440℃, pressures : 180-290 bar, percent of excess amount of oxygen : 0, 300, 600, 800 %, mean residence time : 0.7-11 sec). The conversion of phenol was linearly proportional to the residence time. For example, more than 90 % of phenol was oxidized at the residence time of 5 sec. Within the experimental conditions, the orders of oxidation with respect to phenol and oxygen concentrations were 1 and 0.437±0.027, respectively. Reaction order of water was proportional to density at constant temperature and pressure, and it was 0.653±0.027. The activation energy for the oxidation reaction at 240 bar and 300-440℃ was 18.31 kcal/mol.

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