Effect of Pressure on Hydrocarbon Distribution Sample Clauses

Effect of Pressure on Hydrocarbon Distribution. The influence of reaction pressure on the hydrocarbon distribution was also studied according to the scenario illustrated in Fig. 4. At a pressure lower than the critical pressure of the reaction mixture (P1 =35 bar), and in the region of gas-like density, the overall distribution favors the productions of heavy hydrocarbons with high chain growth probability (αhp = 0.849) as illustrated in Fig. 10a. Significant deviations from the ASF model are observed in the middle hydrocarbons range (C2-C10), illustrating a very high chain growth probability. Increasing the pressure to P2 (50 bar), within the supercritical phase region, resulted in a significant drop in heavy hydrocarbon production (αhp = 0.785), with deviations from the standard ASF model also extending to C10 as seen in Fig. 10b. In the same figure, we can also see that there is a high chain growth probability in both the light and middle distillate hydrocarbon range. As discussed earlier (Fig. 9c), under the baseline conditions of 65 and 250 °C the deviations from ASF extended to C14, while the heavy hydrocarbons chain growth probability slightly decreases to 0.781. Upon increasing the pressure to 80 bar (liquid-like density), no significant change in heavy hydrocarbons chain growth probability was observed (αhp = 0.801), however the deviations from ASF in the product distributions are extended to C16 as seen in Fig. 10c. This illustrates extremely high chain growth probability in the C5-C16 range at this high density. At constant temperature (250 °C), space velocity (93.75 hr-1), and syngas (H2/CO) feed ratio of 2/1, we have studied the product distribution in SCH-FTS over broad range of pressures (35-80 bar). It is important to mention here that the partial pressure of syngas was kept constant at 20 bar, while the hexane partial pressure was varied to achieve the desired total pressure. The bed residence time (defined as the volume of feed at the applied pressure passing through the volume of the catalyst bed per second) was changed as a result of varying the total pressure. Predictions of the bed residence times at the conditions studied were performed based on density calculations at the specified temperature and pressure for a mixture composed of 75 mol% hexane, 16.7 mol% H2, and 8.3 mol% CO. The density of this mixture was determined by using the Xxxx-Xxxxxxxx equation of state (with kij = 0) in a flash calculation in ICAS Version V software. The volumetric flow rate of the mixture was then ob...
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