Extractive crystallization process for the recovery of naphthalene from hydrocarbon stocks utilizing polynitro aromatic compounds as complexors

Claim 1

A PROCESS OF SEPARATING FUSED POLYCYCLIC AROMATIC COMPOUNDS FROM HYDROCARBON STOCKS CONTAINING THE SAME WHICH COMPRISES EMULSIFYING THE HYDROCARBON STOCK IN A LIQUID PHASE WITH AN AMOUNT OF A LIQUID PHASE SOLUTION OF A POLYNITRO AROMATIC COMPOUND, WHICH IS A COMPLEXOR FOR SAID AROMATIC COMPOUNDS, IN A SOLVENT CONSISTING ESSENTIALLY OF A GLYCOL AND WATER WHICH IS SUBSTANTIALLY INSOLUBLE IN SAID HYDROCARBON STOCK TO FORM A SOLID COMPLEX BETWEEN THE POLYNITRO AROMATIC COMPLEXOR AND SAID FUSED POLYCYCLIC AROMATIC COMPOUNDS, SAID AMOUNT OF LIQUID PHASE COMPLEXOR SOLUTION BEING SUFFICIENT TO FORM THE SOLID COMPLEX BUT INSUFFICIENT TO DISSOLVE SAID COMPLEX, AND THE AMOUNT OF COMPLEXOR IN SAID SOLUTION BEING AT LEAST THE THEORETICAL AMOUNT TO FORM A COMPLEX WITH THE FUSED POLYCYCLIC AROMATIC COMPOUNDS, SEPARATING OUT THE SOLID COMPLEX, SEPARATING THE LIQUID COMPLEXOR SOLUTION PHASE AFTER REMOVAL OF THE SOLID COMPLEX FROM THE LIQUID HYDROCARBON PHASE, RETURNING THE LIQUID COMPLEXOR SOLUTION PHASE TO THE SYSTEM, AND DECOMPOSING THE SOLID COMPLEX AND RECOVERING SAID AROMATIC COMPOUNDS.