An apparatus and a process for cooling a feed injector (12) of a gasificationreactor (10) that produces synthesis gas is described.Cooling fluid is injected into a channel (14) in the feed injector (12)adapted for circulating the fluid. The injection pressure is maintainednear or above the gasification reactor pressure. The fluid is withdrawn fromthe channel through an outlet at an outlet pressure betweenabout 515 KPa above to about 1030 KPa below the gasification reactor pressure.The fluid is cooled, degassed, and injected back into thechannel in the feed injector. The pressure on the cooling system is variableand tracks the gasification reactor pressure.
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