I can say u in it only few words like by the filteration processes as the oil must andit will retain on the paper

Oil and water are both immiscible with each other. To separate these two the apparatus needed is a separating funnel.A separating funnel is fitted stopper. Eg:A mixture of immiscible liquids is placed in a separating funnel and allowed to stand.The liquids form different layers . The heavier liquid which forms the lower layer gets collected in a vessel by opening the stopper.The stopper is then closed. The lighter liquid can be collected later in another vessel by the same method.
sorry its less than 150 u can elaborate this a little and then write