Purifying sulfuric acid

Claim 1

A PROCESS FOR PURIFYING A DILUTE AQUEOUS SULFURIC ACID OBTAINED IN STRIPPING ALCOHOL FROM A HYDROLYZED OLEFIN-SULFURIC ACID EXTRACT, SAID DILUTE AQUEOUS SULFURIC ACID HAVING PRESENT AS IMPURITIES SMALL AMOUNTS OF CARBONACEOUS MATERIALS DISSOLVED AND SUSPENDED THEREIN, SAID IMPURITIES BEING FORMED IN THE MANUFACTURE OF THE ALCOHOL BY SULFATING AN OLEFIN IN THE ACID TO FORM THE EXTRACT, THEN DILUTING THE EXTRACT WITH WATER TO HYDROLYZE THE SULFATED OLEFIN THEREIN, WHICH COMPRISES THE STEPS OF ADMIXING A POWDERED ADSORBENT WITH SAID DILUTE AQUEOUS SULFURIC ACID, ADSORBING SAID DISSOLVED CARBONACEOUS IMPURITIES BY SAID POWDERED ADSORBENT IN THE DILUTE ACID, ADMIXING THE RESULTING DILUTE ACID CONTAINING THE IMPURITIES ADSORBED BY THE POWDERED ADSORBENT WITH A HYDROCARBON OIL THAT IS STABLE TO THE ACID AND SUBSTANTIALLY CONSISTS OF HYDROCARBONS THAT BOIL IN THE KEROSENE TO LIGHT LUBRICATING OIL BOILING RANGE, SETTLING THE RESULTING MIXTURE INTO A DILUTE AQUEOUS SULFURIC ACID PHASE FREED OF SAID IMPURITIES AND A HYDROCARBON OIL PHASE CONTAINING THE ADSORBENT HAVING THE CARBONACEOUS IMPURITIES ADSORBED THEREON, AND SEPARATING SAID PHASES, THE DILUTE ACID BEING MAINTAINED OUT OF CONTACT WITH OTHER SULFURIC ACID TREATED ORGANIC SUBSTANCES DURING THESE STEPS SO THAT THE ACID IS NOT FURTHER CONTAMINATED.