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Open Access Publications from the University of California

Co-production of urea and hydrogen/power from natural gas with zero carbon dioxide emissions

  • Author(s): Tian, Xiaohe
  • Advisor(s): Manousiouthakis, Vasilios I
  • et al.

In this work, a flowsheet to produce urea and hydrogen/power from natural gas has been developed, that generates no carbon dioxide emissions through process integration and appropriate selection of reaction conditions, and stream compositions. Two cases are discussed here: the production of urea and hydrogen (case 1) and the production of urea and power (case 2). The energetic self-sufficiency of the overall reaction is first examined, to determine applicable constraints to the overall process. The realization of this overall reaction through a cluster of technologically feasible reactions is then proposed, and an associated process flowsheet is simulated in UNISIM, consisting of four subsystems, including Steam Methane Reforming (SMR), Gaseous Separation (GS), Ammonia Synthesis (AS), and Urea Synthesis (US). Last, economical analysis of the two considered cases is conducted.

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