Suspending colloidal calcium carbonate in hydrocarbon oils

Claim 1

THE PROCESS OF PREPARING A COLLOIDAL DISPERSION OF CALCIUM CARBONATE IN A HYDROCARBON OIL WHICH COMPRISES THE STEPS OF ADMIXING A METHANOL SOLUTION OF CA(SH)2, SAID SOLUTION CONTAINING FROM 6.8 TO 9 WEIGHT PERCENT OF CALCIUM, WITH A HYDROCARBON OIL SOLUTION OF FROM 5 TO 40 WEIGHT PERCENT OF AN OIL-SOLUBLE SURFACTANT, THE PROPORTIONS OF CA(SH)2 AND SURFACTANT BEING SUCH AS TO PROVIDED IN THE FINAL DISPERSION AN EQUIVALENTS RATIO OF CALCIUM TO OIL-SOLUBLE SURFACTANT EXCEEDING A VALUE OF 8 TO 1, THE RATIO OF METHANOL TO SURFACTANT PLUS OIL BEING MAINTAINED WITHIN THE RANGE OF 10 TO 25 PERCENT BY VOLUME, HEATING THE MIXTURE TO A TEMPERATURE IN THE RANGE OF FROM 100 TO 200*F., AND THEN PASSING THERETHROUGH A STREAM OF CO2 IN SUFFICIENT QUANTITY TO CONVERT CA(SH)2 TO CACO3, BUT NOT EXCEEDING 125 PERCENT OF THEORETICAL, AND THEREAFTER REMOVING THE ALCOHOL FROM THE MIXTURE, SAID OIL-SOLUBLE SURFACTANT BEING SELECTED FROM THE GROUP CONSISTING OF PETROLEUM SULFONIC ACIDS, SYNTHETIC SULFONIC ACIDS, PHOSPHOSULFURIZED HYDROCARBONS AND DIALKYL DITHIOPHOSPHORIC ACIDS, AND THEIR RESPECTIVE SALTS, WHEREIN THE CATIONS OF THE SALTS ARE SELECTED FROM THE GROUP CONSISTING OF CA, BA, NA, K, LI, ZN AND HN4.