Rates of Ammonia Absorption and Release in Calcium Chloride

Smith, Collin; Malmali, Mahdi; Liu, Chen -Yu; McCormick, Alon V.; Cussler, E. L.

doi:10.1021/acssuschemeng.8b02108

Title: Rates of Ammonia Absorption and Release in Calcium Chloride

Journal Article · Wed Aug 01 00:00:00 EDT 2018 · ACS Sustainable Chemistry & Engineering

DOI:https://doi.org/10.1021/acssuschemeng.8b02108· OSTI ID:1478643

Smith, Collin ^[1];

^[2]; Liu, Chen -Yu ^[1];

^[1];

^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
Texas Tech Univ., Lubbock, TX (United States)

After synthesis, ammonia can be selectively absorbed by calcium chloride; nitrogen and hydrogen are not absorbed. The kinetics of release seem to be diffusion controlled. The kinetics of absorption are consistent with a first-order reaction after an initial period of a higher-order reaction, which may indicate a nucleation event. At 225 °C, both absorption and release show half-lives of around 10 min if the ammonia partial pressure is swung from 2 to 1 bar, which allows design of an absorber for the periodic separation of ammonia. Furthermore, when this absorber replaces the ammonia condenser in a conventional ammonia synthesis, the ammonia production at low pressure can have the same rate as the conventional process operating at higher pressure.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000804

OSTI ID:: 1478643

Journal Information:: ACS Sustainable Chemistry & Engineering, Vol. 6, Issue 9; Related Information: https://pubs.acs.org/doi/suppl/10.1021/acssuschemeng.8b02108/suppl_file/sc8b02108_si_001.pdf; ISSN 2168-0485

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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