Method and system for cooling a pump

A fluid flow system for circulating a supercritical fluid through a high pressure processing system comprising:

• a primary supercritical flow line having a first end coupled to an outlet of said high pressure processing system and a second end coupled to an inlet of said high pressure processing system, said primary supercritical flow line configured to supply said supercritical fluid at a fluid temperature equal to or greater than 80° C. to said high pressure processing system;
• a high temperature pump having an inlet coupled to a suction side and configured to receive said supercritical fluid and an outlet coupled to a pressure side and configured to discharge said supercritical fluid, wherein said suction side is disposed between said outlet of said high pressure processing system and said high temperature pump and said pressure side is disposed between said high temperature pump and said inlet of said high pressure processing system, wherein said high temperature pump is configured to move said supercritical fluid through said primary supercritical flow line to said high pressure processing system, wherein said high temperature pump further comprises a coolant inlet configured to receive a coolant and a coolant outlet configured to discharge said coolant, and wherein said coolant outlet is coupled to said primary supercritical flow line on said suction side thereof;
• and
• a heat exchanger having an inlet coupled to said primary supercritical flow line on said pressure side for diverting supercritical fluid into said heat exchanger as said coolant, and having an outlet coupled to said coolant inlet, said heat exchanger configured to lower a coolant temperature of said coolant to a temperature less than or equal to said fluid temperature of said supercritical fluid.