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초임계유체에 의한 폐타이어 분해와 추출에서 오일화의 특성
강원석(W . S . Kang),김재경(J . K . Kim),김인실(I . S . Kim),박판욱(P . W . Park) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.4
N/A Conversion and oil-yield of a used automotive tire sample in supercritical decompositon and extraction for three solvents such as water, 28% ammoina solution and ammonia, were compared. Supercritical extraction with ammonia gave the highest conversion and oil-yield at the same temperature and pressure. In this paper, supercritical ammonia was used as major solvent and tetralin acting as hydrogen-donor, was used as cosolvent. As the amount of tetralin increased, oil-yield was increased. When a tire sample was extracted by supercritical ammonia, oil-yield was 48.8% at 280℃, 22.3㎫. But when the weight ratio of tetralin to tire sample (weight of tetralin/weight of tire sample) was 5, oil-yield was 61.2% at 280℃ and 22.3㎫. These phenomena indicate that as radicals produced in supercritical decomposition become stable, the polymerization and the second decomposition of products may be inhibited. Supercritical extraction of a tire sample swollen by tetralin gave high oil-yield although the amount of tetralin was a little.
아임계와 초임계유체로써 폐타이어 분해와 추출에 미치는 용매의 영향
강원석(W . S . Kang),나대엽(D . Y . Na),김인실(I . S . Kim),한성범(S . B . Han),박판욱(P . W . Park) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.3
N/A Side wall samples from a used automotive tire were subjected to subcritical and supercritical decomposition and extraction with three solvents, water, 28% ammonia solution and ammonia. For 6㎜ cube samples the rate of supercritical extraction with water followed a first-order kinetics with an activation energy of 140 kJ/㏖. Solvent power of 28% ammonia solution at supercritical condition was found to be higher than supercritical water at initial extraction as pressure decreased. These phenomena were considered to be an effect of ammonia involved in water.