High barium content complex salts of sulfonic acids and petroleum fractions containing the same

Claim 1

A MINERAL LUBRICATING OIL CONTAINING A MINOR AMOUNT, SUFFICIENT TO IMPROVE THE DETERGENT CHARACTER THEREOF, OF A HIGH BARIUM CONTENT COMPLEX SALT OF A SULFONIC ACID PRODUCERD BY THE METHOD WHICH COMPRISES THE STEPS OF (1) SUBJECTING A HYDROCARBON SOLUTION OF A BASIC BARIUM SULFONATE SALT TO TREATMENT WITH CARBON DIOXIDE WHILE MAINTAINING THE TEMPERATURE OF SAID HYDROCARBON SOLUTION AT A LEVEL OF FROM ABOUT 15/*C. TO ABOUT 25/*C., THE AMOUNT OF CARBON DIOXIDE EMPLOYED DURING SAID TREATMENT BEING AT LEAST ABOUT 1 MOL PER MOL OF BASIC BARIUM SULFONATE SALT IN SAID HYDRCARBON SOLUTION, (2) LOWERING THE TEMPERATURE OF THE REACTION MIXTURE FROM STEP 1 TO A LEVEL OF FROM ABOUT 25*C. TO ABOUT 60*C., (3) ADDING BARIUM METHYLATE TO THE REACTION MIXTURE FROM STEP 2 IN AN AMOUNT TO PROVIDE AT LEAST ABOUT 1 EQUIVALENT OF BARIUM PER MOL OF BASIC BARIUM SULFONATE SALT EMPLOYED IN STEP 1, (4) RAISING THE TEMPERATURE OF THE REACTION MIXTURE TO A LEVEL OF ABOUT 150*C. TO ABOUT 250*C. AND (5) FILTERING THE REACTION MIXTURE TO RECOVER A HYDROCARBON SOLUTION OF THE HIGH BARIUM CONTENT COMPLEX SALT OF SULFONIC ACID.