Which impeller is used in a chemical reactor?+
The impeller is selected for the duty that limits the reactor. HWM and HWM-B lead for liquid blending and heat transfer, HWM, HM and TVM for solids suspension, GDM, GM and GDS for gas-liquid reactions, and HVM for high viscosity. Where several duties apply, different stages can be fitted on the same shaft.
Which agitator is used in a hydrogenation reactor?+
Hydrogenation needs an agitator with a gas dispersion impeller and sealing suited to the pressure. Self-aspirating GM draws headspace hydrogen back into the liquid and needs no external sparger, while GDM with a sparger is selected for high gas rates. HP Series covers vacuum to 150 bar, and HPR reactors are assessed at small scale.
What is flooding in gas dispersion and how is it prevented?+
Flooding is when gas flow exceeds what the impeller can disperse and gas reaches the surface without mixing in. Prevention means selecting gas rate, speed and impeller type together. GDM is designed for high gas rates, and GDS combines radial and axial flow to prevent gas pockets.
How is mixing speed set in crystallization?+
Mixing speed is set close to the lowest value that keeps crystals suspended. A tip speed of 1–3 m/s is the starting point, and the final value depends on crystal size target, solids content and density difference. High speed causes breakage and secondary nucleation, while low speed causes settling and local supersaturation.
Which impeller is used for high-viscosity chemicals?+
High-viscosity duties use the HVM impeller. With its narrow blade geometry, HVM works in laminar flow from 500 to 100,000 cP and can rotate in both directions. Where wall residue is a problem, the PTFE-scraper anchor agitator in RC-L reactors is assessed.
Should a reactor use a mechanical seal or a magnetic coupling?+
The choice depends on pressure, torque and product hazard. Double mechanical seals with barrier fluid are common in high-torque and large reactors. A magnetic coupling removes the dynamic shaft penetration, but transmissible torque is limited and internal bearings need checking with solids-bearing products.
What matters for an agitator in an acid dilution tank?+
In acid dilution, heat and corrosion must be managed together. With products such as sulfuric acid, concentrated acid is fed into water in a controlled way, and the feed point should be in a strong flow zone. Materials are selected for the intermediate concentration and temperature in the dilution zone, not only the final concentration.
Which material should a chemical agitator use?+
Material is selected by concentration, temperature, chlorides and cleaning conditions, not by a chemical name alone. AISI 316L is the starting point for most media, Duplex and Super Duplex are assessed as chlorides rise, and Hastelloy or Titanium for more aggressive media. Titanium is considered for wet chlorine and is not used in dry chlorine.
How is a lab recipe scaled up to a production reactor?+
A lab recipe is scaled by preserving the step that limits the process. Power density, tip speed and blend time cannot all stay constant, so the process decides which one to keep. Data from an RP pilot reactor is carried to production scale, and CFD checks flow and dead zones before manufacturing on higher-risk duties.
What data is needed for a chemical agitator quote?+
Process duty, phase information, density and viscosity range, temperature and pressure, tank dimensions, internals and hazardous area data are a sufficient start. Gas-liquid duties also need gas flow rate, and solids duties need particle size and solids content. We can build assumptions together for any data you do not have.
