PGE 421K Spring 2010 HWSolution5

PGE 421K Spring 2010 HWSolution5 - PGE 421K HOMEWORK #5 60...

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PGE 421K HOMEWORK #5 60 points 1) Results of phase behavior experiments for three different pressure-temperature paths are summarized below. In all cases the initial composition in the phase behavior cell was 50 mol% CH 4 and 50 mol% H 2 O. a. Fill in the rest of the tables. b. Sketch the three-phase boundary on a P-T diagram. Expt 1: initial T = 85 F, P =2205 psia T (deg F) P (psia) Hydrate present? Phases present 85 2205 No L w - G 80 2132 No L w - G 75 2058 No L w – G 70 1985 No L w – G 65 1911 No L w – G 60 1838 No L w – G 55 1764 Yes H-G 50 1691 Yes H-G 45 1617 Yes H-G 40 1544 Yes H-G 35 1470 Yes H-G 10 points
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Expt 2: initial T = 83 F, P =1911 psia T (deg F) P (psia) Hydrate present? Phases present 83 1911 No L w – G 78 1838 No L w – G 73 1764 No L w – G 68 1691 No L w – G 63 1617 No L w – G 58 1544 No L w – G 53 1470 Yes H-G 48 1397 Yes H-G 43 1323 Yes H-G 38 1250 Yes H-G 33 1176 Yes H-G Expt 3: initial T = 83 F, P =1617 psia T (deg F) P (psia) Hydrate present? Phases present 83 1617 No L w – G 78 1544 No L w – G 73 1470 No L w – G 68 1397 No L w – G 63 1323 No L w – G 58 1250 No L w – G 53 1176 No L w - G 48 1103 Yes H-G 43 1029 Yes H-G 38 956 Yes H-G 33 882 Yes H-G 2) Results of phase behavior experiments for three different pressure-temperature paths that included a patented hydrate inhibitor of unknown composition are summarized below. In all cases the initial composition in the phase behavior cell
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PGE 421K Spring 2010 HWSolution5 - PGE 421K HOMEWORK #5 60...

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