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SOLUBILITIES AND MASS TRANSFER COEFFICIENTS OF GASES IN HEAVY SYNTHETIC HYDROCARBON LIQUIDS

Rakymkul, Yeldos (2012) SOLUBILITIES AND MASS TRANSFER COEFFICIENTS OF GASES IN HEAVY SYNTHETIC HYDROCARBON LIQUIDS. Master's Thesis, University of Pittsburgh.

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    Abstract

    The equilibrium gas solubility (C*) and the volumetric liquid-side mass transfer coefficient (kLa) of N2, He, H2 and CO and their mixtures were measured in two liquids (C12-C13 paraffins mixture and Sasol molten reactor wax) using a 4-liter agitated reactor operating in the gas-inducing mode under typical Fischer-Tropsch conditions. The experimental C* and kLa values were obtained in wide ranges of pressure (4-45 bar), temperature (300-500 K), mixing speed (800-1400 RPM), alumina particles concentration (0-20 vol%) and gas composition (0.25, 0.5, 0.75 mole fraction of He in N2 and H2 in CO). Within these experimental conditions, the following results were obtained: • The solubilities of the four gases in the two liquids at constant temperature followed the order C*CO > C*N2 > C*H2 > C*He and obeyed Henry’s Law as their values linearly increased with pressure up to 30 bar. The solubilities of the four gases in both liquids at constant pressure increased with temperature; and an Arrhenius-type equation was used to model the dependency of their Henry’s Law constants on the temperature. The solubilities of the four gases were greater in the paraffins mixture than those in the molten reactor wax. The solubility and diffusivity values showed that He and N2 could be used as surrogates for H2 and CO, respectively. • The mass transfer coefficients of the four gases each as a single-component or in gaseous mixtures in the two liquids increased with mixing speed, pressure and temperature at constant solid concentration. At constant mixing speed, pressure and temperature, kLa values of the four gases in the two liquids decreased with increasing solid concentration above 10 vol%. Also, kLa values for H2 were greater than those of CO and kLa values for He were greater than of N2 in the two liquids. Again, kLa values showed that He and N2 could be used as surrogates for H2 and CO, respectively. • A new empirical relationship was developed to predict kLa of each individual component in a gaseous mixture in liquids/slurries, if the overall kLa of this gas mixture and the diffusivities and solubilities of its components in those liquids/slurries were known.


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    Item Type: University of Pittsburgh ETD
    ETD Committee:
    ETD Committee TypeCommittee MemberEmail
    Committee ChairMorsi, Badie/I
    Committee MemberChiang, Shiao-Hung
    Committee MemberKlinzing, George/E
    Thesis AdvisorMorsi, Badie/I
    Title: SOLUBILITIES AND MASS TRANSFER COEFFICIENTS OF GASES IN HEAVY SYNTHETIC HYDROCARBON LIQUIDS
    Status: Published
    Abstract: The equilibrium gas solubility (C*) and the volumetric liquid-side mass transfer coefficient (kLa) of N2, He, H2 and CO and their mixtures were measured in two liquids (C12-C13 paraffins mixture and Sasol molten reactor wax) using a 4-liter agitated reactor operating in the gas-inducing mode under typical Fischer-Tropsch conditions. The experimental C* and kLa values were obtained in wide ranges of pressure (4-45 bar), temperature (300-500 K), mixing speed (800-1400 RPM), alumina particles concentration (0-20 vol%) and gas composition (0.25, 0.5, 0.75 mole fraction of He in N2 and H2 in CO). Within these experimental conditions, the following results were obtained: • The solubilities of the four gases in the two liquids at constant temperature followed the order C*CO > C*N2 > C*H2 > C*He and obeyed Henry’s Law as their values linearly increased with pressure up to 30 bar. The solubilities of the four gases in both liquids at constant pressure increased with temperature; and an Arrhenius-type equation was used to model the dependency of their Henry’s Law constants on the temperature. The solubilities of the four gases were greater in the paraffins mixture than those in the molten reactor wax. The solubility and diffusivity values showed that He and N2 could be used as surrogates for H2 and CO, respectively. • The mass transfer coefficients of the four gases each as a single-component or in gaseous mixtures in the two liquids increased with mixing speed, pressure and temperature at constant solid concentration. At constant mixing speed, pressure and temperature, kLa values of the four gases in the two liquids decreased with increasing solid concentration above 10 vol%. Also, kLa values for H2 were greater than those of CO and kLa values for He were greater than of N2 in the two liquids. Again, kLa values showed that He and N2 could be used as surrogates for H2 and CO, respectively. • A new empirical relationship was developed to predict kLa of each individual component in a gaseous mixture in liquids/slurries, if the overall kLa of this gas mixture and the diffusivities and solubilities of its components in those liquids/slurries were known.
    Date: 30 January 2012
    Date Type: Publication
    Defense Date: 30 November 2011
    Approval Date: 30 January 2012
    Submission Date: 01 December 2011
    Release Date: 30 January 2012
    Access Restriction: No restriction; Release the ETD for access worldwide immediately.
    Patent pending: No
    Number of Pages: 102
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MS - Master of Science
    Uncontrolled Keywords: Solubility, mass transfer, Fischer-Tropsch, Gas-Inducing Reactor
    Schools and Programs: Swanson School of Engineering > Petroleum Engineering
    Date Deposited: 30 Jan 2012 16:11
    Last Modified: 16 Jul 2014 17:03

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