A process to prepare a synthesis gas comprising hydrogen and carbon
monoxide comprises performing a partial oxidation on a methane comprising
feed using a multi-orifice burner provided with an arrangement of
separate passages, wherein the gaseous hydrocarbon having an elevated
temperature flows through a passage of the burner, an oxidizer gas flows
through a separate passage of the burner and wherein the passage for
gaseous hydrocarbon feed and the passage for oxidizer gas are separated
by a passage through which a secondary gas flows, wherein the secondary
gas comprises hydrogen, carbon monoxide and/or a hydrocarbon.