Chlorobenzene, a compound used in pesticide production, is frequently produced b

Question

Chlorobenzene, a compound used in pesticide production, is frequently produced by the following reaction carried out in the presence of AlCl3. AICI, CI This reaction is always kept below 45'C, because above that temperature di- and tri-chlorinated benzene are products In a particular reactor that produces chlorobenzene, chlorine gas and liquid benzene are fed into a reactor by two separate streams, each at T1 = 25 The chlorine gas stream is fed into the reactor at m = 1·60 kg/s. The molar flow rate of benzene, n2, enters the reactor in a stoichiometric amount. The reaction is carried out at T2 = 40.0 °C, and 1 atm. The fractional conversion of benzene is 0.780. The product streams exit at the same temperature at which the reactor is running. The products consist of chemicals in the gas state (chlorine gas and hydrogen chloride) and chemicals in the liquid state (benzene and chlorobenzene). Assume that no benzene or chlorobenzene is in the gas phase. Find the moles of each species leaving the reactor and the rate of heat that is removed or added to keep the product at 40.0. The heat capacity of liquid chlorobenzene is 0.15504 kJ/(mol-K). The heat of this reaction is 1,=-129.8 kJ / mol What is the rate of chlorine gas leaving the reactor? Number

Explanation / Answer

flow rate of chlorine entering= 1.6 kg/s

Molar flow rate of chlorine = 1.6/71= 0.0225 kg mol/s

Fractional conversion =0.78

Moles of Chlorine converted= 0.0225*0.78= 0.0176

Moles of Chlorine remaining and leaving the reactor = 0.0225-0.0176=0.0049 kmol/s

Moles of Benzene leaving is same as that of chlorine= 0.0049 kmol/s

Moles of Chlorobenzene formed= moles of Benzene reacted= 0.0176 kmol/s

Moles of HCl leaving= 0.0176 knol/s

Heat of reaction= -129.8 Kj/mol

1 mol of Chlorobenzene produces 129.8 Kj/mol

0.0176*1000 mol/s produces 2284. Kj/s= 2284 Kw

Since heat of reaction is positive, heat has to be removed.

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