Question

Environmental Engineering:

Cyanide is used in the production of intermediates in the pharmaceutical industry. A small resulting waste stream containing an organic cyanide, R-CN, is to be treated by high a temperature degradation process that has a constant rate of 8 hr^{-1} (at 170^{o}C). What size of Plug Flow Reactor (PFR) is required to reduce the R-CN concentration from 2000mg/L to 5mg/L, for a waste stream with a flow rate of 30L/min? Assume temperature remains constant in the PFR.

Step 1

Given:

The constant rate (*k*) at 170ºC is 8 hr^{-1}.

Consider the volume of the plug flow reactor is denoted by *V*.

The initial concentration (*C _{A0}*) is 2000 mg/l.

The final concentration (*C _{A}*) is 5mg/l.

The flow rate (*V*_{0}) of the waste stream is 30 L/min.

The rate of change of concentration is denoted by *X*_{A}.

Calculate the rate of change of concentration *X*_{A} as follows:

Step 2

Calculate the size of the plug ...

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