A new Gas Addition Module has been introduced for this company’s FlowSys and other continuous flow reactors. The new module enables fast, controllable pre-saturation of liquid reagents with a wide range of gases and so promotes efficient gas-dependent reactions in flow, such as hydrogenation, ozonolysis, carbonylation and direct synthesis of carboxylic acids. The unit’s pressurized tube-in-tube design overcomes the problem associated with undissolved gas bubbles by ensuring continuous interaction between the gas and liquid at every point along its length. The tube-in-tube design is based on semipermeable membrane technology, whereby the semipermeable inner tube containing the liquid is bathed by a stream of pressurized gas that is enclosed within a thick-walled impermeable outer tube. The Gas Addition Module is compatible with a wide range of reactive gases (such as CO, CO2, H2, D2 and SO2) and organic solvents. — Uniqsis, Cambridge, U.K.