Cascade Continuous Stirred Tank Reactor JLab Manufacturer,Supplier and Exporter in India
Product Code : EL-ET-6647
Jlab Export is a leading Cascade Continuous Stirred Tank Reactor JLab Manufacturer,and suppliers in India
Three stirred tanks of equal volume, joined in series, form this cascade reactor for a non-catalytic, homogeneous second order reaction in the liquid phase at ambient conditions. Two reactants run from their own feed tanks through separate rotameters into the first tank, then pass on to the second and the third. Side ports let students draw samples for analysis along the cascade.
Specifications
| Reactors | Three CSTRs of equal volume, in series |
| Reaction studied | Non-catalytic, homogeneous, second order, liquid phase |
| Operating condition | Ambient |
| Feed tanks | Two, one for each reactant |
| Flow control | Individual rotameter for each reactant |
| Feed circulation | Compressed air |
| Compressed air line | Pressure regulator, pressure gauge and safety valve |
| Sampling | Side ports for sample collection |
| Studies | Cascade performance chart, rate constant at ambient conditions |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Saponification Practicals on the Cascade
The usual teaching reaction is the saponification of ethyl acetate with sodium hydroxide, fed at equal concentrations. Students set the same flow on both rotameters and time the run with a Stopwatch. When the outlet of the third tank stops changing, a sample from each side port goes into a measured excess of Hydrochloric Acid Dilute of known strength. The acid left over is titrated with a standard solution made from Sodium Hydroxide, with Phenolphthalein as the indicator. This gives the unreacted alkali, and so the conversion, in each tank.
Each tank is then treated as a stirred reactor on its own. Its space time is τ = V / v0, the tank volume over the total volumetric feed flow. For equal feeds of a second order reaction, k = (C_in − C_out) / (τ C_out²), and the three tanks should give the same k. Plotting the conversion after each tank against the space time up to that tank gives the performance chart of the cascade.
Frequently Asked Questions
Why use three small tanks instead of one large stirred tank?
A single stirred tank works entirely at its low outlet concentration, so the rate stays slow. In a cascade only the last tank runs at the final concentration, and the first two react faster. For a second order reaction, three tanks in series reach a higher conversion than one tank of the same total volume.
How does a stirred tank cascade compare with a plug flow reactor?
Each tank added in series brings the cascade closer to plug flow, and a very large number of equal tanks behaves like an ideal tubular reactor. Classes often run the same reaction on the Plug Flow Reactor and compare the space time each needs for a given conversion.
How long should we run before taking samples?
Each tank has to settle in turn, so a cascade takes longer to reach steady state than one tank. Wait several times the total space time of the three tanks, then take two samples a few minutes apart. Matching titres show the system is steady.
Why must the reaction be stopped in each sample?
Ethyl acetate and sodium hydroxide go on reacting after the liquid leaves the side port. A sample left standing loses more alkali, and the conversion then reads too high. Running it straight into excess acid fixes the composition at the moment of sampling.
Can this set-up be used for residence time distribution work?
It is built for conversion and rate constant studies with two reactant feeds. Residence time distribution is found by the tracer stimulus and response method, on the RTD Studies in CSTR JLab set-up.
Other Reactor Set-Ups for Reaction Engineering
- Continuous Stirred Tank Reactor (single stirred tank)
- Isothermal Continuous Stirred Tank Reactor (single tank, isothermal duty)
- Plug Flow Reactor, Straight Tube Type JLab
- Plug Flow Reactor (Coiled Tube Type) (helical coil tube)
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Last updated: 6 November 2026
