초임계수와 초임계수산화법에서 catechol과 hydroquinone의 분해에 미치는 NaOH 첨가효과에 대하여 검토하였다. 초임계수 및 초임계수산화법에서 NaOH를 첨가한 경우와 첨가하지 않은 경우의 4가지 조건에서 실험을 수행한 결과 NaOH 첨가는 catechol과 hydroquinone의 분해를 촉진시키는 것으로 나타났다. GC/MS 분석결과 catechol과 hydroquinone의 초임계수산화로부터 많은 중간생성물이 확인되었다. 특히 많은 양의 1.4-benzoquinone이 hydroquinone의 초임계수산화로부터 검출되었다. 1.4-Benzoquinone은 hydroquinone의 산화 후 CO2까지 진행하는 것을 방해하는 억제자로 알려진 물질이다. Catechol과 hydroquinone의 초임계수산화에서 NaOH 첨가는 1,4-benzoquinone를 포함한 다양한 중간생성물의 분해를 촉진시켰으며 NaOH 첨가는 초임계수 및 초임계수산화법에서 CO2과 CH4의 생성량을 증가시켰다. 이러한 결과는 catechol과 hydroquinone의 초임계수산화에서 NaOH가 반응에 상당한 영향을 미치는 것으로써 보다 실용적인 초임계수산화공정의 반응기설계나 최적운전 조건의 선정을 위해서는 NaOH 첨가효과를 고려하는 것이 필요한 것으로 판단되었다.

The aim of this study is to compare the effects of NaOH addition in the decomposition of dihydrobenzenes(catechol and hydroquinone) using supercritical water(SCW) and supercritical water oxidation(SCWO) conditions. Experiments were performed using four sets of conditions, which were in the presence and absence of NaOH in both SCW and SCWO conditions. Under the experimental conditions, the addition of NaOH accelerated the decomposition of catechol and hydroquinone in both the conditions. Several intermediates were identified by performing GC/MS analysis from SCWO of catechol and hydroquinone, and in particular, a large quantity of 1,4-benzoquinone were detected from SCWO of hydroquinone, which is known as an probable inhibitor to hinder the production of CO2 after hydroquinone oxidation. The addition of NaOH to catechol and hydroquinone oxidation reduced the generation of these intermediates including 1,4-benzoquinone, however the effects of the NaOH addition in SCW were the similar as compare to those of SCWO. Further, the addition of NaOH increased the production of CO2 and CH4 in both the conditions. These results revealed that the effects of NaOH on the decomposition of catechol and hydroquinone using SCWO are not negligible. Therefore, its effects on the decomposition of other organic compounds under SCWO conditions should be estimated for determining optimized operating conditions and reactor designs.

SCWO NaOH Catechol Hydroquinone

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