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Reactor with Recycle Stream

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Mass balances are demonstrated for a reactor system. Pure is fed to the system and two parallel reactions take place in the reactor:

[more]

(desired)

(undesired)

A separation unit after the reactor removes some of the unreacted and recycles it back to the feed stream. Use a slider to set the recycle ratio, which is the ratio of the recycle flow rate to the fresh feed flow rate. Set the reactor selectivity, which is the (flow rate of ) / (flow rate of ) leaving the reactor, with a slider. Set the reactor conversion, which is the percent of entering the reactor that is consumed, with a slider. The overall conversion of is the percent of the feed (100 mol A/hr) that is consumed. The yield is the percentage of the feed that is converted to the desired product . A negative flow rate of exiting the system indicates an impossible combination of reaction selectivity and reactor conversion.

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Contributed by: Michael Wrobel (March 2014)
Additional contributions by: Rachael L. Baumann, Garret D. Nicodemus,John L. Falconer and Nick Bongiardina
(University of Colorado Boulder, Department of Chemical and Biological Engineering)
Open content licensed under CC BY-NC-SA

Snapshots

Details

Pure is fed to the reactor where two parallel reactions occur:

(desired),

(undesired).

A separation unit splits the reactant from products and , and some is recycled back to the reactor. The recycle ratio is the ratio of the recycle flow rate to the fresh feed flow rate:

,

where is the recycle flow rate and is the fresh feed flow rate.

The yield is the fraction of the feed that is converted to the desired product :

,

where is the flow rate of the desired product .

The reactor selectivity is the ratio of the desired product to the undesired product :

,

where is the flow rate of the undesired product.

The reactor conversion is the fraction of entering the reactor that is consumed:

,

where and are the flow rates of entering and exiting the reactor.

The overall conversion is the fraction of the feed that is consumed:

,

where is the flow rate of exiting the reactor.

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