ECS-Y Mini Fixed Bed Reactor (Max. 900°C, 10 MPa) for Catalyst Evaluation, EYCEMFBR

A mini fixed-bed reactor (FBR) is the workhorse of catalytic research, designed to simulate industrial-scale chemical processes at a bench-top level. A standard mini-FBR system is divided into three distinct stages: the Feed Section, the Reaction Zone, and the Product Analysis Section.

Feed Section: (1) Gas Delivery: Controlled by Mass Flow Controllers (MFCs). These manage the GHSV (Gas Hourly Space Velocity) to ensure consistent contact time. (2) Liquid Delivery: For multi-phase reactions, high-precision pumps (often HPLC-style) inject liquids into a vaporizer or directly onto a pre-heating zone to ensure a gaseous phase before contact with the catalyst. (3) Mixing: A static mixer or a pre-heat coil ensures that the reactant stream is homogeneous and at the target temperature before it enters the bed.

Reaction Zone: (1) Processing Tube: Usually a vertical tube (Quartz or Alloy). The "mini" designation usually refers to internal diameters between 4 mm and 15 mm. (2) Reaction Bed: The catalyst (powder or extrudates) is held in place by inert supports like quartz wool or sintered metal frits. Diluents (like silicon carbide) are often mixed with the catalyst to improve heat distribution and prevent "channeling." (3) Internal Sensing: A central thermowell allows for axial temperature mapping, which is vital for identifying if a reaction is becoming mass-transfer limited or if hot spots are forming.

Analysis & Downstream Section: (1) Separation: A gas-liquid separator (cold trap) collects condensable products (like water or heavy hydrocarbons) while allowing non-condensable gases to pass. (2) Pressure/Flow Regulation: Systems use regulators to maintain a steady environment, preventing fluctuations that could skew kinetic readings. (3) Sampling: Heated transfer lines carry the product stream to a Gas Chromatograph (GC) or Mass Spectrometer (MS) for real-time quantification.

References:

G. Mendow, et al., Evaluation of Pd−In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor, Ind. Eng. Chem. Res. 2011, 50, 4, 1911–1920

D. A Hickman, et al., Fundamental principles of laboratory fixed bed reactor design, Current Opinion in Chemical Engineering, 2016, 13, 1-9.