The invention is directed to a process to provide a particulate solid carbonaceous material to a pressurized gasification reactor comprising following steps,(a) transporting the solid material from a first lower pressure zone to a higher pressure zone using a bulk materials pump comprising a housing having a flow path for the solid material between an inlet fluidly connected to the first lower pressure zone and an outlet fluidly connected to the higher pressure zone, wherein said flow path in said housing is further defined by a space between two rotatable drive disks spaced from each other and wherein a materials scraper is present between said drive disks at the outlet to route a cake of solid material that is being transported between said drive disks to a transport conduit, which transport conduit fluidly connects the outlet of said housing and a burner as present in the gasification reactor, and(b) injecting a gaseous stream into the cake of solid material where the cake of solid material is discharged from the housing and enters the transport conduit, and(c) transporting the solid material and the gaseous stream in a transport conduit to the burner.
