[16 points] It is desired to produce a hot vapor stream of benzene to feed a rea

Question

[16 points] It is desired to produce a hot vapor stream of benzene to feed a reactor for a certain petrochemical process. The benzene is available from an off-site storage facility at 1 atm pressure and ambient temperature (assume 25°C), and the reactor requires the benzene to be at 250°C at 10 atm. Two possible process schemes are being considered to heat and pressurize the feed: (1) pump the liquid benzene to pressure and then vaporize it in a heat exchanger, and (2) vaporize the benzene first and then compress it to the desired pressure. a. Discuss qualitatively which scheme (if either) is better

Explanation / Answer

(a) Given,

Benzene at 1 atm and 25°C to be vaporized and pressurized to 10 atm and 250°C.

Pumping a liquid requires less power than compressing a vapor. So, the pumping and heating will be better than heating and compressing a vapor.

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