Process for preparing n n-di

Claim 1

A PROCESS FOR PREPARATION OF A LUBRICANT OIL DETERGENT ADDITIVE COMPRISING A SOLUTION OF ABOUT 45 TO 50 WEIGHT PERCENT N1,(K - DI(POLYBUTENYLSUCCINIMIDE) OF TETRAETHYLENE PENTAMINE WHOSE POLYBUTENYL GROUP IS DERIVED FROM POLYBUTENE HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 860 DISSOLVED IN FROM 55 TO 50 WEIGHT PERCENT OF A SOLVENT COMPRISING A LIGHT HYDROCARBON OIL AND POLYBUTENE HAVING AN AVERAGE MOLECULAR WEIGHT OF 860 AND A VISCOSITY 1,000 SSU AT 210*F., WHICH COMPRISES REACTING IN AN INERT GAS ATMOSPHERE SAID POLYBUTENE WITH MALEIC ANHYDRIDE IN A RATIO OF 0.7 TO 0.9 MOLE MALEIC ANHYDRIDE PER MOLE POLYBUTENE BY HEATING SAID POLYBUTENE TO A TEMPERATURE IN THE RANGE OF 400 TO 475*F., ADDING MOLTEN MALEIC ANHYDRIDE AT A TEMPPERATURE OF FROM 170 TO 425*F. SLOWLY TO SAID POLYBUTENE AT THE RATE OF FROM 0.1 TO 0.4 MOLE PER HOUR, MAINTAINING THE RESULTING REACTION MIXTURE AT A TEMPERATURE OF FROM 400 TO 475*F. FOR A TOTAL OF 10 TO 24 HOURS REACTION TIME, THEREAFTER REMOVING UNREACTED MALEIC ANHYDRIDE BY DISTILLATION AND REMOVING MALEIC ANHYDRIDE DECOMPOSITION PRODUCTS HAVING A VAPOR PRESSURE GREATER THAN MALEIC ANHYDRIDE BY FILTRATION, AND DILUTING SAID REACTION PRODUCT WITH A LIGHT MINERAL OIL TO A CONCENTRATION OF 45 TO 60% OF THE RESULTING 3 POLYBUTENYLSUCCINIC ANHYDRIDE, THEREAFTER COOLING SAID SOLUTION OF POLYBUTENYLSUCCINIC ANHYDRIDE TO A TEMPERATURE IN THE RANGE OF 200 TO 250*F., REACTING IN AN INERT GAS ATMOSPHERE TETRAETHYLENE PENTAMINE WITH SAID DISSOLVED POLYBUTENYLSUCCINIC ANHYDRIDE IN THE RATIO OF 0.4 TO 0.6 MOLE OF SAID PENTAMINE PER MOLE OF POLYBUTENYLSUCCINIC ANHYDRIDE IN SOLUTION BY THE SLOW ADDITION OF SAID PENTAMINE AT A TEMPERATURE IN THE RANGE OF 200 TO 300*F., AND REMOVING WATER OF REACTION, WHEREBY THE PRODUCT OF REACTION BETWEEN SAID POLYBUTENYLSUCCINIC ANHYDRIDE AND TETRAETHYLENE PENTAMINE CONSISTS ESSENTIALLY OF SAID N1N5-DI(POLYBUTENYL SUCCINIMIDE) OF TETRAETHYLENE PENTAMINE AND DILUTING SAID REACTION PRODUCT WITH LIGHT MINERAL OIL TO A CONCENTRATION OF FROM 45 TO 50 WEIGHT PERCENT, SAID POLYBUTENYL SUCCINIC ANHYDRIDETETRAETHYL PENTAMINE REACTION PRODUCT IS CHARACTERIZED BY BEING SUBSTANTIALLY FREE FROM REACTION PRODUCTS CONTAINING AMIDE GROUPS.