practice problem 4_solution

# practice problem 4_solution - CH 250 Precincts 150°C Air...

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Unformatted text preview: CH; 250 Precincts 150°C Air 100 25°C —u—* Ccoling water Methane (CH4) is oxidized with air to produce formaldehyde (HCHO) in a continuous reactor via the following reaction: CH4(g) + Ozrg) 9 HCHO(sJ + H2O(g) (1) A competing reaction is the combustion of methane to form C02: “01L 0% In this specific problem, CH4 and 02 enters the reactor at a mole ratio of 1:1. In the reactor, 40% of CH4 is consumed. Of this 40%, 75% reacted via reaction (1) and the other 25% reacted via reaction (2). The heat produced in the reactor is taken away by cooling water ﬂowing in the tube (see the diagram). The pressure is low enough for ideal gas behavior to be assumed. How much heat (kl/h) must be taken away if CH4 enters the reactor at a rate of 100 mole/h? AHOE CH4, gas = -74.84 kJ/mcl AHoﬂ HCHo, gas = —115.89 kJ/mol AHOﬁ (:02, gas = 393.51 kJ/mol AHOE H20, gas : -24i Cp forallothergases and vapors:30 J/mol.K 0H4 f 02; *3 H5960 "fm (U T31R54 ‘ BMW *6“: we“ 1 onat +101, 77 a); r eat/0 (9-9 [lo/Meg 3066 xiii] [\$02 WWW a) Wé (H? W7 (9c M are 00+:- 04 7’52: \$0.5M Wait/La (4) WM Odd/067a MAM/7 x 0.3mﬁﬂm0/ngﬂﬁL /gm‘gmg \ 03 6‘2. )c-drﬁg/o eel mag Mariel Uzi; C2), [Wabde aim/we dalmawﬁmo, s W O~ZW6€ 92/, W W 2 éef a , vuaﬂ ' 5 - 1 1,0 (4'; j N; wﬁrg: 4 xii 024 aSr’Fé wag ...
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