Preparation of alkaline earth petroleum sulfonates

Claim 1

THE METHOD OF PREPARING WEAKLY-BASIC METAL PETROLEUM SULFONATES FROM MID-CONTINENT SOLVENT REFINED NEUTRAL LUBRICATING OILS HAVING VISCOSITIES IN THE RANGE OF ABOUT 170-600 SUS AT 100*F. WHICH COMPRISES, SULFONATING SAID REFINED LUBRICATING OILS WITH SULFUR TRIOXIDE AT A SULFUR-TRIOXIDE-TO-OIL WEIGHT RATIO OF ABOUT 0.02 TO 0.08 AND A TEMPERATURE OF ABOUT 95 TO 126*F. TO FORM SULFONIC ACIDS THEREFROM, REACTING SAID SULFONIC ACID PRODUCT WITH A HYDRATED MELT OF AN ALKALINE EARTH METAL COMPOUND OF THE GROUP CONSISTING OF BARIUM HYDROXIDE, BARIUM OXIDE, BARIUM HYDROXIDE-OCTAHYDRATE, CALCIUM OXIDE, CALCIUM HYDROXIDE, STRONTIUM OXIDE AND STRONTIUM HYDROXIDE AT A TEMPERATURE OF ABOUT 300-500* F. TO FORM THE ALKALINE EARTH METAL SALT THEREOF, DRYING THE RESULTING SALT PRODUCT TO A WATER CONTENT OF LESS THAN ABOUT 0.3 WEIGHT PERCENT, CENTRIFUGING SAID DRIED PRODUCT FROM A HYDROCARBON SOLVENT TO REMOVE SUSPENDED SOLIDS, REACTING THE CENTRIFUGED PRODUCT WITH AN ACIDIC COMPONENT OF THE GROUP CONSISTING OF CARBON DIOXIDE, CARBON DISULFIDE AND CARBONYL SULFIDE AT A TEMPERATURE OF ABOUT 150-400*F. WHILE MAINTAINING SAID WATER CONTENT BELOW ABOUT 0.3 WEIGHT PERCENT UNTIL THE SULFONATE PRODUCT HAS A PH OF LESS THAN ABOUT 11 AND THE FINISHED PRODUCT HAS CHARACTERIZED BY AN ALKALINE EARTH METAL HYDROXIDE CONTENT AND AN ALAKLINE EARTH METAL CARBONATE CONTENT OF LESS THAN ABOUT 0.1% BY WEIGHT AND EXHIBITS A STRONG BASE NUMBER OF SUBSTANTIALLY 0, AND RECOVERING THE WEAKLY BASIC ALKALINE EARTH METAL PETROLEUM SULFONATE SO FORMED.

Claim 2

THE METHOD OF PREPARING WEAKLY-BASIC METAL PETROLEUM SULFONATES FROM MID-CONTINENT SOLVENT REFINED NEUTRAL LUBRICATING OILS HAVING VISCOSITIES IN THE RANGE OF ABOUT 170-600 SUS AT 100*F. WHICH COMPRISES, SULFONATING SAID REFINED LUBRICATING OILS WITH SULFUR TRIOXIDE AT A SULFUR-TRIOXIDE-TO-OIL WEIGHT RATIO OF ABOUT 0.02 TO 0.08 AND A TEMPERATURE OF ABOUT 95 TO 126*F. TO FORM SULFONIC ACIDS THEREFROM, REACTING SAID SULFONIC ACID PRODUCT WITH A HYDRATED MELT OF AN ALKALINE EARTH METAL COMPOUND OF THE GROUP CONSISTING OF BARIUM HYDROXIDE, BARIUM OXIDE, BARIUM HYDROXIDE-OCTAHYDRATE, CALCIUM OXIDE, CALCIUM HYDROXIDE, STRONTIUM OXIDE AND STRONTIUM HYDROXIDE AT A TEMPERATURE OF ABOUT 300-500* F. TO FORM THE ALKALINE EARTH METAL SALT THEREOF, DRYING THE RESULTING SALT PRODUCT TO A WATER CONTENT OF LESS THAN ABOUT 0.3 WEIGHT PERCENT, CENTRIFUGING SAID DRIED PRODUCT FROM A HYDROCARBON SOLVENT TO REMOVE SUSPENDED SOLIDS, REACTING THE CENTRIFUGED PRODUCT WITH AN ACIDIC COMPONENT OF THE GROUP CONSISTING OF CARBON DIOXIDE, CARBON DISULFIDE AND CARBONYL SULFIDE AT A TEMPERATURE OF ABOUT 150-400*F. WHILE MAINTAINING SAID WATER CONTENT BELOW ABOUT 0.3 WEIGHT PERCENT UNTIL THE SULFONATE PRODUCT HAS A PH OF LESS THAN ABOUT 11 AND THE FINISHED PRODUCT HAS CHARACTERIZED BY AN ALKALINE EARTH METAL HYDROXIDE CONTENT AND AN ALAKLINE EARTH METAL CARBONATE CONTENT OF LESS THAN ABOUT 0.1% BY WEIGHT AND EXHIBITS A STRONG BASE NUMBER OF SUBSTANTIALLY 0, AND RECOVERING THE WEAKLY BASIC ALKALINE EARTH METAL PETROLEUM SULFONATE SO FORMED.