Based on the laboratory results of the Institute of Petroleum

Academia Sinica

on urea extractive crystallization

a pilot plant with a capacity of 0.15 ton per day has been constructed & operated. With water as urea solvent and an organic chlorine compound as activator

the adducts formed into small spheres which are easily filterable. The main characteristics of the process developed was that the adduction

filtration

washing and decomposition operations were carried out in the same vessel. The design data for a commercial plant were obtained during the pilot plant run. Satisfactory dewaxing results were obtained for both light and heavy petroleum fractions with various wax contents. For light petroleum fractions

the freezing point can be lowered to below-70C. The process developed is suitable for manufacturing speciality low freezing point petroleum products

and the n-paraffins obtained after refining are good raw materials for making higher alcohols

detergents

etc.