Table i

Claim 1

AN IMPROVED PROCESS FOR THE PREPARATION OF A DETERGENT INHIBITOR FOR MINERAL OIL COMPOSITIONS WHICH COMPRISES REACTING, AT A TEMPERATURE IN THE RANGE OF ABOUT 60 TO 190*F. A HYDROCARBON OIL SOLUTION OF A PHOSPHOSULFURIZED HYDROCARBON AND A PHENOLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKYL PHENOLS HAVING MOLECULAR WEIGHTS IN THE RANGE OF 200 TO 700 AND SULFIDES OF SAID ALKYL PHENOLS WITH A BASE SELECTED FROM THE GROUP CONSISTING OF CALCIUM OXIDE AND CALCIUM HYDROXIDE, IN AN AMOUNT SUFFICIENT TO FURNISH A RATIO OF CALCIUM EQUIVALENTS TO PHOSPHOSULFURIZED HYDROCARBON EQUIVALENTS IN THE RANGE OF FROM ABOUT 3 TO 1 TO ABOUT 11 TO 1, AND THEREAFTER WITH CARBON DIOXIDE, IN THE PRESENCE OF A NITROGEN BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE AND ALIPHATIC AMINES OF FROM 1 TO 4 CARBON ATOMS, SAID NITROGEN BASE BEING PRESENT IN AN AMOUNT TO PROVIDE A WEIGHT RATIO OF NITROGEN TO CALCIUM OF AT LEAST 0.02 TO 1, THE AMOUNT OF CARBON DIOXIDE EMPLOYED BEING IN THE RANGE OF FROM ABOUT 80 TO ABOUT 95 PERCENT OF THE AMOUNT THEORETICALLY REQUIRED TO CONVERT THE CALCIUM TO CALCIUM CARBONATE, THE REACTION PRODUCT BEING DEHYDRATED AND THEN FILTERED SUBSEQUENT TO SAID TREATMENT WITH CARBON DIOXIDE.