Reducing corrosion in plant equipment

Claim 1

A METHOD OF REDUCING CORROSION OF PLANT EQUIPMENT UPON COOLING OF HOT EFFLUENT PRODUCTS FROM A DISTILLATION ZONE AND AVOIDING EMULSIFICATION DURING SUBSEQUENT SEPARATION, WHICH COMPRISES INCORPORATING IN SAID HOT EFFLUENT PRODUCTS A MIXED SOLUTION OF AN INORGANIC ALKALINE AGENT AND A WATER SOLUBLE CORROSION INHIBITOR PREPARED BY (1) CONDENSING AN ALKYLENE OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS WITH A HIGH BOILING POLYAMINE RESIDUE UNDER CONDITIONS TO REPLACE EACH AMINE HYDROGEN OF SAID POLYAMINE RESIDUE WITH AN OXYALKYLENE GROUP, SAID RESIDUE BEING THE RESIDUAL MATERIAL REMAINING AFTER DISTILLING OFF TETRAETHYLENE PENTAMINE AND LIGHTER PRODUCTS FORMED IN THE MANUFACTURE OF ETHYLENE DIAMINE BY THE REACTION OF ETHYLENE CHLORIDE WITH AMMONIA, AND (2) THEREAFTER PARTIALLY ESTERIFYING THE RESULTANT CONDENSATION PRODUCT BY REACTING WITH A MIXED CARBOXYLIC ACID CONTAINING FROM ABOUT 16 TO 40 CARBON ATOMS PER MOLECULE IN A MOLE RATIO OF ACID TO OXYALKYLATED POLYAMINE RESIDUE OF FROM ABOUT 0.1 TO ABOUT 1.25:1, AND SUBSEQUENTLY COOLING SAID HOT EFFLUENT PRODUCTS.

Claim 2

A METHOD OF REDUCING CORROSION OF PLANT EQUIPMENT UPON COOLING OF HOT EFFLUENT PRODUCTS FROM A DISTILLATION ZONE AND AVOIDING EMULSIFICATION DURING SUBSEQUENT SEPARATION, WHICH COMPRISES INCORPORATING IN SAID HOT EFFLUENT PRODUCTS A MIXED SOLUTION OF AN INORGANIC ALKALINE AGENT AND A WATER SOLUBLE CORROSION INHIBITOR PREPARED BY (1) CONDENSING AN ALKYLENE OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS WITH A HIGH BOILING POLYAMINE RESIDUE UNDER CONDITIONS TO REPLACE EACH AMINE HYDROGEN OF SAID POLYAMINE RESIDUE WITH AN OXYALKYLENE GROUP, SAID RESIDUE BEING THE RESIDUAL MATERIAL REMAINING AFTER DISTILLING OFF TETRAETHYLENE PENTAMINE AND LIGHTER PRODUCTS FORMED IN THE MANUFACTURE OF ETHYLENE DIAMINE BY THE REACTION OF ETHYLENE CHLORIDE WITH AMMONIA, AND (2) THEREAFTER PARTIALLY ESTERIFYING THE RESULTANT CONDENSATION PRODUCT BY REACTING WITH A MIXED CARBOXYLIC ACID CONTAINING FROM ABOUT 16 TO 40 CARBON ATOMS PER MOLECULE IN A MOLE RATIO OF ACID TO OXYALKYLATED POLYAMINE RESIDUE OF FROM ABOUT 0.1 TO ABOUT 1.25:1, AND SUBSEQUENTLY COOLING SAID HOT EFFLUENT PRODUCTS.