Process Calculations GATE-2014

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Q 1: Two elemental gases (A and B) are reacting to form a liquid (C) in a steady state process as per the reaction A+B\rightarrow C . The single-pass conversion of the reaction is only 20% and hence recycle used. The product is separated completely into pure form. The fresh feed has 49 mol% of A and B each along with 2 mol% impurities. The maximum allowable impurities in the recycle stream is 20 mol%. The amount of purge stream (in moles) per 100 moles of the fresh feed is __________.

Ans is 10 mol)

Explanation:

Q 2: Carbon monoxide (CO) is burnt in presence of 200 % excess pure oxygen and the flame temperature achieved is 2298 K. The inlet streams are at 25 0C. The standard heat of formation (at 25 0C) of CO and CO2 are -110 kJ/mol and -390 kJ/mol, respectively. The heat capacities (in J mol-1 K-1) of the components are

C_{p,O_2}=25+14\times10^{-3}T C_{p,{\mathrm{CO}}_2}=25+42\times10^{-3}T

Where T is the temperature in K. The heat loss (in kJ) per mole of CO burnt is _________.

Ans is 34 to 35 kJ)

Explanation:


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