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Ultrasonic treatment was performed to decompose EVA (ethylene vinyl acetate) in toluene or benzene under various conditions; solvent concentration, temperature, ultrasonic power, and irradiation distance between horn and EVA film. In all experiments, ultrasonic frequency, agitation speed, and irradiation time were fixed at 20 kHz, 600 rpm, 30 minutes, respectively. Toluene was better than benzene for the decomposition of EVA as a solvent. At the distance of 9 cm from horn to EVA, the decomposition rate increased proportionally with the concentration of solvent, temperature and ultrasonic power, and the maximum rate was found to be 93% at 70℃ and 900 W in 2 M toluene. CTAB Surfactant (cetyl trimethylammonium bromide), which was added for dispersion of solvent, formed micelle and reduced the concentration of solvent, so the decomposition rate decreased. At the distance of 2 cm, EVA was decomposed perfectly regardless of the other conditions. Moreover, the rate fluctuated repeatedly with increasing the distance between solvent and the EVA film. This results from the effect of standing wave and EVA was successfully decomposed at distance according to ultrasonic frequency.
Ethylene vinyl acetate (EVA) 분해에 있어서 초음파 효과를 조사하기 위해 초음파 강도, 혼과의 거리, 용매종류, 농도 및 온도를 변화시키면서 실험을 진행하였다. 실험 결과 용매로는 톨루엔이 가장 적합하였고, 혼과의 거리 9 cm 조건에서 용매농도, 온도, 초음파 강도에 비례하여 분해율이 증가하였으며, 톨루엔 2 M, 70℃, 900W 조건에서 최대 93%의 EVA가 분해되었다. 용매분산을 위해 CTAB(cetyl trimethylammonium bromide) 계면활성제를 혼입하였을 경우, 액 중 미셀 형성으로 오히려 용매농도를 감소시켜 EVA 분해가 저감됨을 알 수 있었다. 혼과의 거리가 2 cm 구간에서는 다른 조건에 관계없이 EVA의 완전 분해가 확인되었고, 이후 거리 증가에 따라 분해율의 감소와 상승이 반복되었다. 이는 정재파(standing wave)현상의 영향이라고 판단되며 이에 초음파에 의한 EVA 분해를 향상시키기 위해서는 혼과의 거리를 초음파 주파수에 따라 로 조절해야 됨을 알 수 있었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 47
- No :5
- Pages :647-652
Journal of the Korean Society of Mineral and Energy Resources Engineers
