Separation Process Principles- 2n - Seader & Henley - Solutions Manual

5 c mole purities in a table like table 17 assumptions

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Unformatted text preview: ble like Table 1.7 Assumptions: Reasonable values for splits of iC4 to streams where they are not the main component. Analysis: (a) Process-flow diagram: 2 1 4 C 1 6 C 2 3 C 3 5 7 Exercise 1.22 (continued) (b) Using given recoveries: Propane in Stream 2 = 0.98(45.4) = 44.5 kmol/h i-Butane in Stream 4 = 0.98(136.1) = 133.4 kmol/h n-Butane in Stream 6 = 0.98(226.8) = 222.3 kmol/h C5s in Stream 7 = 0.98(181.4 + 317.5) = 488.9 kmol/h Material-balance table in kmol/h: Comp C3 iC4 nC4 iC5 nC5 Total (c) 1 45.4 136.1 226.8 181.4 317.5 907.2 2 44.5 1.3 0.5 0.0 0.0 46.3 3 0.9 134.8 226.3 181.4 317.5 860.9 4 0.9 133.4 2.5 0.0 0.0 136.8 5 0.0 1.4 223.8 181.4 317.5 724.1 6 0.0 1.4 222.3 7.0 3.0 233.7 Mol% purity of propane-rich product = 45.4/46.3 = 0.961 = 96.1% Mol% purity of i-butane-rich product = 133.4/136.8 = 0.975 = 97.5% Mol% purity of n-butane-rich product = 222.3/233.7 = 0.951 = 95.1% Mol% purity of C5s-rich product = (174.4 + 314.5)/490.4 = 0.997 = 99.7% 7 0.0 0.0 1.5 174.4 314.5 490.4 Exercise 1.23 Subject: Methods for removing organic pollutants from wastewater. Given: Available industrial processes: (1) adsorption (2) distillation (3) liquid-liquid extraction (4) membrane separation (5) stripping with air (6) stripping with steam Find: Advantages and disadvantages of each process. Analysis: Some advantages and disadvantages are given in the following table: Method Adsorption Advantages Adsorbents are available. Distillation May be practical if pollutant is more volatile. Solvent are available. L-L extraction Membrane Air stripping Steam stripping May be practical if a membrane can be found that is highly selective for pollutant. May be practical if pollutant is more volatile. May be practical if pollutant is more volatile. Disadvantages Difficult to recover pollutant. Best to incinerate it. Impractical is water is more volatile. Water will be contaminated with solvent. May need a large membrane area if water is the permeate. Danger of producing a flammable gas mixture. Must be able to selectively condense pollutant from overhead. With adsorption, can incinerate pollutant, but with a loss of adsorbent. With distillation, may be able to obtain a pollutant product. With L-L extraction, will have to separate pollutant from solvent. With a membrane, may be able to obtain a pollutant product. With air stripping, may be able to incinerate pollutant. With steam stripping may be able to obtain a pollutant product. Exercise 1.24 Subject: Removal of VOCs from a waste gas stream. Given: Waste gas containing VOCs that must be removed by any of the following methods: (1) absorption (2) adsorption (3) condensation (4) freezing (5) membrane separation Find: Advantages and disadvantages of each method. Analysis: Some advantages and disadvantages are given in the following table: Method Absorption Advantages Good absorbents probably exist. Adsorption Good adsorbents probably exist. Condensation May be able to recover the VOC as a product. May be able to recover the VOC as a product. May be able to recover t...
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This document was uploaded on 02/24/2014 for the course CBE 2124 at NYU Poly.

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