Thermodynamic Interferences of HCl and HF in Producer Gas Desulfurization by Ce, La, Mn and Zn Based Solid Sorbents

0431439 - ÚCHP 2015 CZ eng C - Conference Paper (international conference)
Hartman, Miloslav - Svoboda, Karel - Pohořelý, Michael - Šyc, Michal - Jeremiáš, Michal - Huang, Ch.-Y.
Thermodynamic Interferences of HCl and HF in Producer Gas Desulfurization by Ce, La, Mn and Zn Based Solid Sorbents.
Final program. Prague: Orgit, 2014, s. 79. ISBN 978-80-02-02555-9.
[International Congress of Chemical and Process Engineering /21./ - CHISA 2014 and Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction /17./ - PRES 2014. Prague (CZ), 23.08.2014-27.08.2014]
R&D Projects: GA ČR GA14-09692J
Grant - others:NSC(TW) 103-2923-E-042A-001-MY3
Institutional support: RVO:67985858
Keywords : producer gas * desulfurization * thermodynamics
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

In our thermodynamic theoretical study we concentrated our attention on thermodynamics of gas-solid desulfurization reactions (H2S, COS, thiophene), properties of sorbents (melting point evaporation), attainable equilibrium sulfur compounds concentrations in gas at temperature 500 – 1100 K (227-827 oC) under conditions typical for producer gas composition. Similarly removal of HCl and HF by Ce, La, Zn, Mn and Ni oxides based sorbents is described and possible interferences in simultaneous sorption of HCl or HF with H2S are analyzed. Suitable conditions and sorbents are suggested for deep removal of sulfur compounds in presence of HCl. Conditions for efficient preliminary removal of HCl and HF by alkali-based sorbents (NaHCO3, K2CO3, Ca(OH)2, CaCO3) are suggested and possible interferences caused by H2S are analyzed in terms of attainable equilibrium concentrations of HCl and HF in presence of H2S. Properties of La and Ce-based sorbents for sulfur compounds are compared with Zn, Mn and Ni based sorbents in terms of efficiency and interferences caused by presence of hydrogen-halides (HCl, HF).
Permanent Link: http://hdl.handle.net/11104/0236031