Three-Stage Adiabatic Hydrogenation Pilot Unit

The three reactor stages operate in series with independent temperature control, reproducing the axial temperature-rise profile of an industrial adiabatic bed stage by stage. Interstage cold-hydrogen quenching adjusts the inlet temperature to the subsequent stage, enabling evaluation of catalyst selectivity and bed pressure-drop evolution under near-industrial operating conditions. Built as an integrated skid, electrical and instrumentation systems conform to Ex d IIB T4 explosion-proof standards, with analyzers and controls housed inside a positive-pressure purged cabinet suitable for direct installation in hydrogen-classified hazardous zones. On the feed side, high-pressure diaphragm metering pumps and mass flow controllers separately meter liquid and gas streams for precise two-phase ratio control. Combined with online sampling and full-process data logging, a single catalyst charge can run continuously for over 1,000 h to complete catalyst deactivation and lifetime testing.