The vapor-phase cracking of gas-oil in Example 10-8 is canied out över a dif-ferent cataly...

The vapor-phase cracking of gas-oil in Example 10-8 is canied out över a dif-ferent catalyst, for vvhich the rate law is

(a) Assuming that you can vary the entering pressure and gas velocity, what operating conditions vvould you recommend?

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(b) What could go wrong vvith the conditions you chose?

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Now assume the decay law is

where the concentration, Ccoke, in mol/dm3, can be determined from a stoichiometric table.

(c) For a temperature of 400°C and a reactor height of 15 m, vvhat gas velocity do you recommend? Explain. What is the corresponding conversion?

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(d) The reaction is now to be carried in an STTR 15 m high and 1.5 m in diameter. The gas velocity is 2.5 m/s. You can operate in the temperature range between 100 and 500°C. What temperature do you choose, and what is the corresponding conversion?

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(e) What vvould the temperature-time trajectory look like for a CSTR?

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Additional information:

ER = 3000 cal/mol

ED = 15,000 cal/mol