Process of refining hydrocarbon mineral oils

Claim 1

IN A PROCESS FOR OBTAINING COMMERCIALLY USEFUL PRODUCTS FROM SUBSTANTIALLY ALL OF THE ORGANIC INGREDIENTS OF THE TWO LIQUID PHASES OBTAINED IN THE REFINING OF AN OIL SELECTED FROM THE GROUP CONSISTING OF SYNTHETIC AND NATURAL MINERAL OILS BY TREATING WITH A SULFONATING REAGENT CONSISTING ESSENTIALLY OF SULFURIC ACID HAVING AN ACID CONTENT AT LEAST EQUAL TO THAT OF 66* BE SULFURIC ACID, SAID TWO PHASES COMPRISING A FIRST PHASE CONTAINING OIL AND OIL SOLUBLE SULFONIC COMPOUNDS AND THE SECOND PHASE CONTAINING AQUEOUS SULFURIC ACID WITH WATER SOLUBLE SULFONIC COMPOUNDS, THE STEPS COMPRISING, TREATING SAID FIRST SEPARATED PHASE WITH A HIGH BOILING SOLVENT CONSISTING ESSENTIALLY OF AN OIL-INSOLUBLE ALKYOLAMINE WHICH IS SOLVENT FOR THE SULFONIC COMPOUNDS, SEPARATING THE TWO PHASES RESULTING TO PROVIDE A LIGHTER PHASE CONSISTING ESSENTIALLY OF REFINED OIL AND A HEAVIEER PHASE COMPRISING THE ALKYLOLAMINE AND THE SULFONIC ACID COMPOUNDS, ADDING TO SAID HEAVIER PHASE ON ORGANIC ACID COMPOUND HAVING A CARBOXYL FUNCTIONAL GROUP SELECTED FROM THE GROUP CONSISTING OF HIGHER FATTY ACIDS CONTAINING UP TO 18 CARBON ATOMS, TALL OIL AND NAPHTHENIC ACID, HEATING SAID HEAVIER PHASE TO ESTERIFY THE ORGANIC ACID COMPOUND WITH THE EXCESS OF ALKYLOLAMINE.