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Korean Chemical Engineering Research,
Vol.42, No.6, 662-668, 2004
Vol.42, No.6, 662-668, 2004
마이크로파 조사 가열에 의한 Oil-Water 에멀젼의 분리
Demulsification of Oil-Water Emulsions by Microwave Irradiation
본 연구에서는 마이크로파 가열에 의한 O/W형 에멀젼의 분리 특성(오일 회수율, 승온 특성, 분산 입자의 변화)을 실험에 의하여 검토하였다. 720 W의 마그네트론 출력을 갖는 마이크로파 오븐에 의하여 20, 30 그리고 50%(v/v)O/W형 에멀젼을 120초 동안 연속적으로 조사 후, 1시간 중력 침강시켜 각각 75, 84 그리고 95%의 오일 회수율을 얻었으며, 승온 속도는 0.478, 0.505 그리고 0.602(℃/s)로 오일 함량이 많은 50%(v/v)O/W형 에멀젼에서 크게 나타났다. 또한, 온도 상승에 의한 점도 감소가 일어나 오일 입자간 합체가 촉진되고 분산 입자의 직경이 증가하였다.
The studies of oil recovery, size of dispersed droplets and temperature profile during microwave demulsification were carried out. Microwave demulsification has no secondary pollution problems, because no chemical additives are required. Also, because microwave selectively heats emulsion, faster separation rate and less energy consumption than conventional heating are possible. As the 20, 30, and 50%(v/v)O/W emulsions were continuously irradiated by microwave for 120 seconds, percentages of oil recovery after 1hr settlement were 75, 84, and 95% respectively. Also, the rates of temperature rise were 0.478, 0.505, and 0.602(oC/s) respectively. Likewise, because the viscosity of emulsion was decreased with temperature rise, the diameter of dispersed oil droplet was increased and the coalescence of it was accelerated. Therefore, demulsification was quickly accomplished.
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