Crystallisation process for producing very pure para-xylene

The invention is a novel of comprises at least 55 to 60wt% paraxylenes the high-energy efficiency method for producing material and p-xyleneto, wherein without wherein the slurry and in the presence of re-crystallization from about 10 to the temperature  to about 55  the first crystal in step of the first part of high converting material, wherein the part of high converting material of the heavy crude liquid, and obtaining, is heated in the step a crystalline converting is heated by low temperature to obtain, does not need to any refrigerate, wherein the temperature of 10  to about 55  the slurry.