The ejector-driven monolith loop reactor — experiments and modeling

Monoliths as multiphase reactors: A review

“…Different types of distributors can be used to achieve the desired uniform flow distribution over the monolith cross section. Literature cites the use of spray nozzles, shower heads, and ejectors for downflow (Broekhuis et al, 2001;Hatziantoniou et al, 1984;Satterfield et al, 1977), and hole plates, glass frits, and static mixers for upflow mode (Thulasidas et al, 1995b); still other variations exist.…”

“…In the "in-line monolith reactor," the monolith pieces are incorporated in the pipes carrying reactants (Stankiewicz et al, 2001). In the "mononolith loop reactor" , and in the "ejector-driven monolith loop reactor" (Broekhuis et al, 2001), the gaseous reactant is sucked into the reactor by the liquid flow, making a closed loop of gas flow. The basic element in these reactors is the monolithic support; however, they vary with respect to cell density and void fraction.…”

“…Therefore the holdup can be changed either by changing liquid or gas flow rates. Broekhuis et al (2001) and Heiszwolf et al (2001a) described a monolith loop reactor in which gas is recirculated within the system using an ejector driven by liquid flow. The gas recirculation velocity depends on the liquid velocity, the two being related because of the equilibrium of pressure drop in the monolith section and recirculation section.…”

“…The observed reaction rate was close to the intrinsic rate, which the authors interpreted as a sign of good phase distribution and minimal transport resistances. Broekhuis et al (2001) used a liquid-motive ejector as a gas-liquid distributor. They claim that this ejector is also a very good gas-liquid contactor, presaturating liquid before it enters the reactor.…”

Prozessintensivierung heterogen katalysierter Gas/Flüssig‐Reaktionen mit Monolithreaktoren

“…In der experimentellen Praxis haben sich als Verteilersysteme für die Gas/Flüssig-Abwärtsströmung Sprühdüsen [20], Ejektoren [21] und in Aufwärtsströmung Statikmixer [22] bewährt.…”