Solvent extraction of low-temperature tar and products therefrom

Claim 1

A PROCESS FOR OBTAINING A PITCH, CHARACTERIZED BY HAVING SUBSTANTIAL LEACHING RESISTANCE TO AQUEOUS ALKALINE SOLUTIONS AND BY BEING MORE ALIPHATIC IN NATURE THAN PITCH OBTAINED FROM HIGH-TEMPERATURE TAR, FROM A TAR OBTAINED FROM A LOW-TEMPERATURE CARBONIZATION OF COAL COMPRISING: EXTRACTING SAID TAR AT A TEMPERATURE OF 100* TO 140*F. WITH AN AQUEOUS ALCOHOL SOLUTION CONTAINING 60 TO 75 WEIGHT PERCENT OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, AND PROPYL ALCOHOLS, AND WITH A LIQUID ALIPHATIC HYDROCARBON OF FROM 4 TO 8 CARBON ATOMS, RECOVERING A LIQUID ALIPHATIC HYDROCARBON EXTRACT COMPRISING THE LIQUID ALIPHATIC HYDROCARBON, NEUTRAL OILS, AND SAID PITCH FROM SAID EXTRACTING, AND SEPARATING SAID PITCH FROM SAID LIQUID ALIPHATIC HYDROCARBON EXTRACT, SAID AQUEOUS ALCOHOL SOLUTION AND LIQUID ALIPHATIC HYDROCARBON BEING IMMISCIBLE AND HAVING A DIFFERENCE IN SPECIFIC GRAVITIES WITH 3 TO 12 PARTS BY WEIGHT OF EACH BEING EMPLOYED FOR EVERY PART BY WEIGHT OF SAID TAR.