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톨루엔의 기상접촉산와에 의한 안식향상의 제조

Gas-phase Catalytic Oxidation of Toluene to Benzoic Acid

서경원 김재진 이화영

Seo KW Kim JJ Lee WY

HWAHAK KONGHAK, October 1982, 20(5), 343-354(12), NONE

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Abstract

V₂O₅와 헤테로폴리 12-몰리브도바나도 인산 （H₃₊_nPMo_12-_nV_nO₄₀）계 촉매에 의한 톨루엔의 기상접촉산화반응에서 반응온도, 공기와 톨루엔의 혼합비 및 공간속도가 주생성물인 안식향산과 벤즈알데히드의 수율과 선택도에 미치는 영향을 조사하였다. 안식향상에 대한 최대선택도는 H₄PM₁₁V₁O₄₀ 촉매를 사용하여, 반응온도 450 ℃, 공기/톨루엔의 몰비 272, 공간속도 1,585 l/hr/l-cat.에서 78 %를 얻을 수 있었으며 제조된 촉매들의 산화력의 크기는 다음과 같았다.
V₂O₅⁡H₅PMo₁₀V₂O₄₀⁡H₆PMo₉V₃O₄₀⁡H₄PMo₁₁V₂O₄₀.
또한 촉매의 산화반응기구에 Langmuir-Hinshelwood 개념에 의한 산화-환원반응기구를 적용하였다.

Benzoic acid and benzaldehyde were obtained by gas-phase catalytic oxidation of toluene over V₂O₅ and heteropoly 12-molybdovanadophosphoric acid（H₃₊_nPMo_12-_nV_nO₄₀）, The effects of reaction temperature, air/toluene mole ratio, and space velocity on the yields and selectivities were investigated. With H₄PMo₁₁V₁O₄₀ catalyst, the maximum selectivity of benzoic acid, 78 %, could be obtained at 450 ℃, with the space velocity of 1,585 l/hr/l-cat. and air/toluene mole ratio 272. The oxidizing power of catalysts in this work was as follows; V₂O₅>H₅PMo₁₀V₂O₄₀>H₆PMo₉V₃O₄₀>H₄PMo₁₁V₁O₄₀. For the catalytic oxidation mechanism, a redox reaction mechanism based upon the Langmuir-Hinshelwood approach was used.

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