Catalytic Hydrogenation Using Teledyne Isco Syringe Pumps
This type of reaction requires pumps for liquid reac- tant and solvent at precise flow rates over a wide pressure range. The Teledyne Isco syringe pumps pro- vide precise and accurate flow rates at a precision of 0.5% or better of setpoint over the reaction pressures of 50 to 2000 psi or higher. Pump calibration is not required. Mass loss from a balance of calculations and feedback control to the pump are not required. Further- more, if the reactant is a highly viscous liquid of low melting solid, the entire syringe pump cylinder can be easily heated to provide easy liquid flow control.
The syringe pumps provide truly pulseless flow; the feed rates of the liquid reactant are constant and show no sinusoidal flow typical of other pump types, such as reciprocating pumps. Thus, the kinetics of formation of the depletion of the reactant, and the formation of the desired product, are kept absolutely constant at any specified H2 pressure or reaction temperature. Unwanted or side reactions due to varying concentra- tions are suppressed
Figure 3: Typical Laboratory scale hydrogenation reactor system with two Isco pumps operating
