Parr Instruments Series 3911 Shaker Type Hydrogenation Apparatus. A compact and easily handled system for treating chemicals with hydrogen in the presence of catalysts. Used to synthesize or modify organic compounds by catalytic hydrogenation, reduction, or condensation, and is also suitable for other procedures in which high-pressure, vigorous liquid-gas mixture is required. Operates at pressures up to 60 psi and temperatures up to 80°C. Works with bottles sizes 250 mL or 500 mL.