Question: 4. A flash chamber operating at 55 C and 200 kPa is separating 1,000 kg moles/hr of a feed that is 40 mol % propane,

4. A flash chamber operating at 55 C and 200 kPa

4. A flash chamber operating at 55 C and 200 kPa is separating 1,000 kg moles/hr of a feed that is 40 mol % propane, 15 mol % n-butane, 10 mol % n-pentane, and 35 mol % n-hexane. Find the product compositions and flow rates. K-values for each chemical can be obtained using following equation. Constants for fitting are given in the attached table. (25) In K = a,,/T? +ar2/T +276 +a, In p+ap2/p> +ap3/p pl TABLE 2-3. Constants for fit to K values using Eq. (2-30) Compound Mean Error ar2 ap! 42 Methane Ethylene Ethane Propylene Propane -292,860 0 -600.076.875 0 -687,248.25 0 -923,484.6875 0 -970,688.5625 0 8.2445 7.90595 7.90694 7.71725 7.15059 -.8951 59.8465 0 -.84677 42.94594 0 -.88600 49.02654 0 -.87871 47.67624 0 --769840 6.90224 1.66 2.65 1.95 1.90 2.35 0 0 0 0 Isobutane -1,166,846 n-Butane -1,280,557 Isopentane -1,481,583 n-Pentane -1,524,891 n-Hexane -1,778,901 0 7.72668 7.94986 7.58071 7.33129 6.96783 -92213 0 -.964550 -93159 0 -.891430 -.84634 0 0 2.52 3.61 4.56 4.30 4.90 0 0 0 0 n-Heptane -2,013,803 n-Octane 0 n-Nonane -2,551,040 n-Decane 0 0 6.52914 -79543 0 - 7646.81641 12.48457-73152 0 0 5.69313 -.67818 0 -9760.45703 13.80354 -.71470 0 0 0 0 0 6.34 7.58 9.40 5.69 Note: Tis in R, and p is in psia Source: McWilliams (1973)

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