HMT - Semi-Batch Manufacture of Hexamethylenetriamine

Aqueous ammonia is added continuously to an initial batch charge of formaldehyde solution. The reaction is instantaneous and highly exothermic, and is given by 

For the semi-batch operation the total mass balance is 

For the instantaneous reaction, the rate is equal to the reactant feed rate. The energy balance then becomes 

Mcp = Wcp(To-T) -f WXao(-AH) - UA(T-Tc) where Xao is the mass fraction of ammonia in the feed stream. 

TEMP =(W CP (TEMPO-TEMP)+W XA0 HR-Q)/(M CP) PLOT T,TEMP,0,TFIN,0,TEMPMAX PREPARE T,TEMP,M 

5 Simulation Tools and Examples of Chemical Engineering Processes 

Since the reaction rate is instantaneous, this is set equal to the feed rate of ammonia. 

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