Corrosion resistant heat exchanger

Abstract

A heat exchanger that is fabricated with high nickel metal alloys provides enhanced corrosion resistance when in contact with fluids that are reducing and contain metal chlorides. In an embodiment, this type of heat exchanger is used in the recovery section of a solution polymerization process.

1 . An improved method for heat exchange between a hot process fluid and a coolant stream; characterized in that a heat exchanger, having a hot process fluid side and a coolant stream side, is employed in said method and wherein the materials of construction used on said hot process fluid side are Cr—Ni—Fe—Mo alloys that contain from 50 to 65 weight % Ni. 
     
     
         2 . The method of  claim 1  wherein the hot process fluid creates a reducing environment. 
     
     
         3 . The method of  claim 1  wherein the hot process fluid is substantially free of oxygen. 
     
     
         4 . The method of  claim 1  wherein hot process fluid contains chlorides. 
     
     
         5 . The method of  claim 1  wherein the Cr—Ni—Fe—Mo alloys are chosen from INCONEL 625 and HASTELLOY C-276.