Separation of hydrocarbons

Claim 1

A PROCESS FOR THE EXTRACTIVE CRYSTALLIZATION OF A HYDROCARBON MIXTURE COMPRISING HYDROCARBONS WHICH FORM ADDUCTS WITH UREA AND HYDROCARBONS WHICH DO NOT FORM ADDUCTS WITH UREA, WHICH COMPRISES TREATING SAID HYDROCARBON MIXTURE WITH A SOLUTION COMPRISING UREA DISSOLVED IN A SOLVENT WHEREBY THERE IS FORMED A COMPLEX SLURRY, SAID SLURRY COMPRISING A LIQUID PHASE COMPRISING A "UREA ADDUCTION RAFFINATE, A LIQUID PHASE COMPRISING UREA SOLUTION, AND, IN SUSPENSION, A SOLID UREA ADDUCT, THEREAFTER SEPARATING AT LEAST PART OF THE UREA ADDUCTION RAFFINATE FROM THE COMPLEX SLURRY BY DECANTTATION AND WITHIN THE PERIOD PRIOR TO AND DURING SAID SEPARATION, SUBJECTING SAID SLURRY TO THE ACTION OF MECHANICAL VIBRATIONS OF AN AMPLITUDE IN THE RANGE OF 1 MM. TO 5 CMS. AND A FREQUENCY IN THE RANGE OF 100-2000 PER MINUTE WHEREBY THERE IS FORMED IN UPPER LIQUID PHASE COMPRISING RAFFINATE AND WHEREBY THE SOLID MATERIALS PASS INTO THE LOWER LIQUID PHASE RECOVERING UREA SOLUTION, AND AFTER SAID SEPARATION RECOVERING THE UREA ADDUCTION EXTRACT FROM THE REMAINING MIXTURE OF SOLID AND LIQUID PHASE.