h********e
发帖数: 312 | 1 521. Butyraldehyde(BA) is produced at a rate of 5,000 gpd and fed to a 30,
000-gal tank held at 30oC and 771-mm Hg absolute pressure under nitrogen.
The vent is cooled to -18oc in a refrigerated condenser, data on BA is as
follows,
MW 72.11
Vapor Pressure at 30oC 150mm Hg
Vapor Pressure at -18oC 10mm Hg
The amount of BA condensed (lb/day) is most nearly:
A) 8.8
B) 22.5
C) 24.7
D) 135
看了答案也不是很明白，哪位大侠能大致说说这个是啥过程吗，谢谢了 | S****n
发帖数: 95 | 2 BA content in the tank air:
150mmHg/771mmHg=19.5%
BA content in the condenser air:
10mmHg/771mmHg=1.3%
Gas goes through the vent per day 5000 gallons=18927 liters@30C and 771 mmHg
BA volume condensed per day=(19.5%-1.3%)*18927=3445 liters @30C and 771 mmHg
PV=nRT
n=PV/RT
P=771mmHg/760mmHg*atm-1=1.0145 atm
R=0.082 L atm K−1 mol−1
T=303K
n=1.0145*3445/0.082/303=141 mol, every day
141 mol*(72.11 g/mol)*0.0022 lb/g=22.4 lb every day
The answer is B?
【在 h********e 的大作中提到】
: 521. Butyraldehyde(BA) is produced at a rate of 5,000 gpd and fed to a 30,
: 000-gal tank held at 30oC and 771-mm Hg absolute pressure under nitrogen.
: The vent is cooled to -18oc in a refrigerated condenser, data on BA is as
: follows,
: MW 72.11
: Vapor Pressure at 30oC 150mm Hg
: Vapor Pressure at -18oC 10mm Hg
: The amount of BA condensed (lb/day) is most nearly:
: A) 8.8
: B) 22.5
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