Systems for compressing a gas

Systems are provided for gasification (106) operations. The systems may use carbonous gas (118, 124) as part of plant (100) operations. The systems may include a first compressor (172) configured to compress a carbonous gas (118, 124) and a controller (125). The controller (125) is configured to control the first compressor (172) to transition from compressing a first carbonous gas (124) to compressing a second carbonous gas (118) during startup of a gasification system (106).