Chemical Engineering - Chemical Reaction Engineering - Discussion


When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is

[A]. > 1
[B]. < 1
[C]. 1
[D]. 0

Answer: Option C


No answer description available for this question.

Raj Kishor said: (Jan 3, 2016)  
Please tell me the reason behind this?

Saurabh Yadav said: (Aug 13, 2017)  
It is an ideal case, as per the levenspiel popcorn example when there is a uniform distribution of material in reactor then the mean residence time remain constant because.

1) there is a constant rate of input as well as output.

2) a fixed amount of accumulation. i.e. no dead zone, bypassing, channelling etc.

On the other hand, space time is the time required to treat a reactor volume completely,
So space time == mean residence time.

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