Abstract: A method for the continuous process of fluids is based on mixing the fluid with a supercritical fluid. The mixing of the two fluids may be accomplished using either a co-flow or counter-flow process. The process focuses on the difference in the solubilities of the desired and the undesired components into supercritical fluid and de-emphasizes the influence of the contaminating components of the fluid to be processed. The process of the present invention is particularly advantageous to the recycling of industrial waste fluids, such as used oil, wherein the process is carried out by jet spray micro-orifices atomization of waste material with a supercritical fluid to dissolve oil from the waste material. Additional mixing devices such as a magneto driven impeller shaft and ultrasonic gun may be employed. Thereafter, un-dissolved components are separated, first and the dissolved fluid is then separated from the supercritical fluid. Various apparatus for carrying out the method are also disclosed.