HIGH PURITY PARAFFINIC SOLVENT COMPOSITIONS, AND PROCESS FOR THEIR MANUFACTURE

摘要

DISCLOSES HIGH PURITY SOLVENT COMPOSITIONS CONSTITUTED OF N-PARAFFINS AND ISOPARAFFINS, WITH THE ISOPARAFFINS CONTAINING PREDOMINANTLY METHYL BRANCHES, AND HAVING AN ISOPARAFFIN:N-PARAFFM RATIO SUFFICIENT TO PROVIDE SUPERIOR LOW TEMPERATURE PROPERTIES AND LOW VISCOSITIES. THE SOLVENT COMPOSITIONS ARE MADE BY A PROCESS WHEREIN A WAXY, OR LONG CHAIN PARAFFINIC FEED, ESPECIALLY A FISCHER- TROPSCH WAX, IS REACTED OVER A DUAL FUNCTION CATALYST TO PRODUCE HYDROISOMERIZATION AND HYDROCRACKING REACTIONS AT 371 °C+ (700°F+) CONVERSION LEVELS RANGING FROM ABOUT 20 TO 90 WT. TO PROVIDE A C5-565.6°C (C5-1050°F) CRUDE FRACTION. THE C5-565.6°C (C5-1050°F) CRUDE FRACTION IS THEN TOPPED VIA ATMOSPHERIC DISTILLATION TO PRODUCE A LOW BOILING FRACTION WITH AN UPPER END POINT BOILING BETWEEN ABOUT 343.3°C (650°F) AND 398.9°C (750°F). THE LOW BOILING FRACTION IS FRACTIONATED AND A NARROW BOILING RANGE SOLVENT OBTAINED THEREFROM; ONE WHICH CAN BE FURTHER DIVIDED INTO SOLVENT GRADES OF VARIOUS BOILING RANGES.