Wikipedia

Ammonia production

Ammonia productiontakes place worldwide, mostly in large-scale manufacturing plants that produce 183 million metric tonnes[1]of ammonia (2021) annually.[2][3]Leading producers are China (31.9%), Russia (8.7%), India (7.5%), and the United States (7.1%). 80% or more ofammoniais used asfertilizer.Ammonia is also used for the production of plastics, fibres, explosives, nitric acid (via theOstwald process), and intermediates for dyes and pharmaceuticals. The industry contributes 1% to 2% of globalCO
2.[4]Between 18–20 Mt of the gas is transported globally each year.[5]

History

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Dry distillation

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Before the start ofWorld War I,most ammonia was obtained by the drydistillationof nitrogenous vegetable and animal products; by the reduction ofnitrous acidandnitriteswithhydrogen;and also by the decomposition of ammonium salts by alkaline hydroxides or byquicklime,the salt most generally used being the chloride (sal-ammoniac).

Block flow diagram of the ammonia synthesis process

Frank–Caro process

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Main article:Frank-Caro process

Adolph Frank and Nikodem Caro found that Nitrogen could be fixed by using the samecalcium carbideproduced to makeacetyleneto form calcium-cyanamide, which could then be divided with water to form ammonia. The method was developed between 1895 and 1899.

[6]

Birkeland–Eyde process

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Main article:Birkeland–Eyde process

While not strictly speaking a method of producing ammonia, nitrogen can be fixed by passing it (with oxygen) through an electric spark.

Nitrides

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Heating metals such as magnesium in an atmosphere of pure nitrogen producesnitride,which when combined with water produce metal hydroxide and ammonia.

Haber-Bosch process

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This section is an excerpt fromHaber process.[edit]
Fritz Haber,1918

TheHaber process,[7]also called the Haber–Bosch process, is the main industrial procedure for the production of ammonia.[8][9]It converts atmosphericnitrogen(N2) toammonia(NH3) by a reaction withhydrogen(H2) using a finely dividedironmetal catalyst:

This reaction is slightlyfavorablein terms ofenthalpy,but is disfavored in terms ofentropybecause four equivalents of reactant gases are converted into two equivalents of product gas. As a result, high pressures and moderately high temperatures are needed todrive the reaction forward.

The German chemistsFritz HaberandCarl Boschdeveloped the process in the first decade of the 20th century, and its improved efficiency over existing methods such as theBirkeland-EydeandFrank-Caroprocesses was a major advancement in the industrial production of ammonia.[10][11][12]The Haber process can be combined withsteam reformingto produce ammonia with just three chemical inputs: water, natural gas, and atmospheric nitrogen. Both Haber and Bosch were eventually awarded theNobel Prize in Chemistry:Haber in 1918 for ammonia synthesis specifically, and Bosch in 1931 for related contributions tohigh-pressure chemistry.

Environmental Impacts

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Further information:Haber process § Economic and environmental aspects

Because ammonia production depends on a reliable supply ofenergy,fossil fuels are often used, contributing to climate change when they are combusted and creategreenhouse gasses.[13]Ammonia production also introduces nitrogen into the Earth's nitrogen cycle, causing imbalances that contribute to environmental issues such as algae blooms.[14][15][16]Certain production methods prove to have less of an environmental impact, such as those powered by renewable or nuclear energy.[16]

Sustainable production

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Illustrating inputs and outputs of methanepyrolysis,a process to produce hydrogen.

Sustainable production is possible by using non-pollutingmethane pyrolysisor generating hydrogen bywater electrolysiswithrenewable energysources.[17]ThyssenkruppUhde Chlorine Engineers expanded its annual production capacity for alkaline water electrolysis to 1 gigawatt of electrolyzer capacity for this purpose.[18]

Illustrating inputs and outputs of simpleelectrolysisof water, for production of hydrogen.

In ahydrogen economysomehydrogen productioncould be diverted to feedstock use. For example, in 2002, Icelandproduced 2,000 tons of hydrogen gas by electrolysis,using excess power from itshydroelectricplants, primarily for fertilizer.[19]TheVemorkhydroelectric plant in Norway used its surplus electricity output togenerate renewable nitric acidfrom 1911 to 1971,[20]requiring 15 mWh/ton of nitric acid. The same reaction is carried out by lightning, providing a natural source of soluble nitrates.[21]Natural gas remains the lowest cost method.

Wastewateris often high in ammonia. Because discharging ammonia-laden water into the environment damages marine life,nitrificationis often necessary to remove the ammonia.[22]This may become a potentially sustainable source of ammonia given its abundance.[23]Alternatively, ammonia from wastewater can be sent into an ammonia electrolyzer (ammoniaelectrolysis) operating with renewable energy sources to produce hydrogen and clean water.[24]Ammonia electrolysis may require much less thermodynamic energy than water electrolysis (only 0.06 V in alkaline media).[25]

Another option for recovering ammonia from wastewater is to use the mechanics of the ammonia-water thermal absorption cycle.[26][27]Ammonia can thus be recovered either as a liquid or as ammonium hydroxide. The advantage of the former is that it is much easier to handle and transport, whereas the latter has commercial value at concentrations of 30 percent in solution.

Coal

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The Process to make ammonia from coal

Making ammonia from coal is mainly practised in China, where it is the main source.[6]Oxygen from the air separation module is fed to the gasifier to convert coal into synthesis gas (H2,CO, CO2) andCH4.Most gasifiers are based on fluidized beds that operate above atmospheric pressure and have the ability to utilize different coal feeds.

Production plants

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The American Oil Co in the mid-1960s positioned a single-converter ammonia plant engineered byM. W. Kelloggat Texas City, Texas, with a capacity of 544 m.t./day. It used a single-train design that received the “Kirkpatrick Chemical Engineering Achievement Award” in 1967. The plant used a four-case centrifugal compressor to compress thesyngasto a pressure of 152 bar Final compression to an operating pressure of 324 bar occurred in a reciprocating compressor. Centrifugal compressors for the synthesis loop and refrigeration services provided significant cost reductions.

Almost every plant built between 1964 and 1992 had large single-train designs with syngas manufacturing at 25–35 bar and ammonia synthesis at 150–200 bar. Braun Purifier process plants utilized a primary or tubular reformer with a low outlet temperature and highmethane leakageto reduce the size and cost of the reformer. Air was added to the secondary reformer to reduce the methane content of the primary reformer exit stream to 1–2%. Excess nitrogen and other impurities were erased downstream of the methanator. Because the syngas was essentially free of impurities, two axial-flow ammonia converters were used. In early 2000 Uhde developed a process that enabled plant capacities of 3300 mtpd and more. The key innovation was a single-flow synthesis loop at medium pressure in series with a conventional high-pressure synthesis loop.[28]

Small-scale onsite plants

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In April 2017, Japanese company Tsubame BHB implemened a method of ammonia synthesis that could allow economic production at scales 1-2 orders of magnitude below than ordinary plants with utilizing electrochemical catalyst.[29][30]

Green ammonia

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In 2024, theBBCannounced numerous companies were attempting to reduce the 2% ofglobal carbon dioxide emissionscaused by the use/production of ammonia by producing the product in labs. The industry has become known as"green ammonia."[31]

Byproducts and shortages due to shutdowns

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One of the main industrial byproducts of ammonia production isCO2.In 2018, high oil prices resulted in an extended summer shutdown of European ammonia factories causing a commercial CO2shortage, thus limiting production of CO2-based products such as beer and soft drinks.[32]This situation repeated in September 2021 due to a 250-400% increase in the wholesale price of natural gas over the course of the year.[33][34]

See also

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References

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  1. ^Congressional Research Service. (7 December 2022). "Ammonia’s Potential Role in a Low-Carbon Economy".CRP websiteRetrieved 24 September 2023.
  2. ^"Global ammonia annual production capacity".
  3. ^"Mitsubishi Heavy Industries BrandVoice: Scaling Ammonia Production for the World's Food Supply".Forbes.
  4. ^Koop, Fermin (2023-01-13)."Green ammonia (and fertilizer) may finally be in sight -- and it would be huge".ZME Science.Retrieved2023-03-21.
  5. ^Congressional Research Service. (7 December 2022). "Ammonia’s Potential Role in a Low-Carbon Economy".CRP websiteRetrieved 24 September 2023.
  6. ^ab"Introduction to Ammonia Production".www.aiche.org.2016-09-08.Retrieved2021-08-19.
  7. ^Habers process chemistry.India: Arihant publications. 2018. p. 264.ISBN978-93-131-6303-9.
  8. ^Appl, M. (1982). "The Haber–Bosch Process and the Development of Chemical Engineering".A Century of Chemical Engineering.New York: Plenum Press. pp. 29–54.ISBN978-0-306-40895-3.
  9. ^Appl, Max (2006). "Ammonia".Ullmann's Encyclopedia of Industrial Chemistry.Weinheim: Wiley-VCH.doi:10.1002/14356007.a02_143.pub2.ISBN978-3527306732.
  10. ^Smil, Vaclav (2004).Enriching the Earth: Fritz Haber, Carl Bosch, and the Transformation of World Food Production(1st ed.). Cambridge, MA: MIT.ISBN978-0-262-69313-4.
  11. ^Hager, Thomas (2008).The Alchemy of Air: A Jewish genius, a doomed tycoon, and the scientific discovery that fed the world but fueled the rise of Hitler(1st ed.). New York, New York: Harmony Books.ISBN978-0-307-35178-4.
  12. ^Sittig, Marshall (1979).Fertilizer Industry: Processes, Pollution Control, and Energy Conservation.Park Ridge, New Jersey: Noyes Data Corp.ISBN978-0-8155-0734-5.
  13. ^Mayer, Patricia; Ramirez, Adrian; Pezzella, Giuseppe; Winter, Benedikt; Sarathy, S. Mani; Gascon, Jorge; Bardow, André (2023-08-18)."Blue and green ammonia production: A techno-economic and life cycle assessment perspective".iScience.26(8): 107389.Bibcode:2023iSci...26j7389M.doi:10.1016/j.isci.2023.107389.PMC10404734.PMID37554439.
  14. ^Glibert, Patricia M; Maranger, Roxane; Sobota, Daniel J; Bouwman, Lex (2014-10-01)."The Haber Bosch–harmful algal bloom (HB–HAB) link".Environmental Research Letters.9(10): 105001.Bibcode:2014ERL.....9j5001G.doi:10.1088/1748-9326/9/10/105001.ISSN1748-9326.
  15. ^Erisman, Jan Willem; Galloway, James N.; Seitzinger, Sybil; Bleeker, Albert; Dise, Nancy B.; Petrescu, A. M. Roxana; Leach, Allison M.; de Vries, Wim (2013-07-05)."Consequences of human modification of the global nitrogen cycle".Philosophical Transactions of the Royal Society B: Biological Sciences.368(1621): 20130116.doi:10.1098/rstb.2013.0116.ISSN0962-8436.PMC3682738.PMID23713116.
  16. ^abLi, Yifei; Zhang, Zongyue; Wang, Qingrui; Long, Xiangtao; Cao, Yuwei; Yang, Haiping; Yang, Qing (2023-11-01)."The nitrogen and carbon footprints of ammonia synthesis in China based on life cycle assessment".Journal of Environmental Management.345:118848.doi:10.1016/j.jenvman.2023.118848.ISSN0301-4797.PMID37660421.
  17. ^Lumbers, Brock (2022)."Mathematical modelling and simulation of the thermo-catalytic decomposition of methane for economically improved hydrogen production".International Journal of Hydrogen Energy.47(7): 4265–4283.doi:10.1016/j.ijhydene.2021.11.057.S2CID244814932.Retrieved16 March2022.
  18. ^"Water Electrolysis > Products > Home".Uhde Chlorine Engineers.Archived fromthe originalon 2021-10-19.Retrieved2021-12-08.
  19. ^"Iceland launches energy revolution".BBC News. 2001-12-24. Archived fromthe originalon 7 April 2008.Retrieved2008-03-23.
  20. ^Bradley, David (2004-02-06)."A Great Potential: The Great Lakes as a Regional Renewable Energy Source"(PDF).Archived fromthe original(PDF)on 29 October 2008.Retrieved2008-10-04.
  21. ^Karl Fisher; William E. Newton (2002). G. J. Leigh (ed.).Nitrogen fixation at the millennium.Elsevier. pp.2–3.ISBN978-0-444-50965-9.
  22. ^"StackPath".www.waterworld.com.March 2010.
  23. ^Huang, Jianyin; Kankanamge, Nadeeka Rathnayake; Chow, Christopher; Welsh, David T.; Li, Tianling; Teasdale, Peter R. (January 2018). "Removing ammonium from water and wastewater using cost-effective adsorbents: A review".Journal of Environmental Sciences.63:174–197.doi:10.1016/j.jes.2017.09.009.PMID29406102.
  24. ^Muthuvel, Madhivanan;Botte, Gerardine G(2009). "Trends in Ammonia Electrolysis".Modern Aspects of Electrochemistry, No. 45.Vol. 45. pp. 207–245.doi:10.1007/978-1-4419-0655-7_4.ISBN978-1-4419-0654-0.
  25. ^Gwak, Jieun; Choun, Myounghoon; Lee, Jaeyoung (February 2016). "Alkaline Ammonia Electrolysis on Electrodeposited Platinum for Controllable Hydrogen Production".ChemSusChem.9(4): 403–408.Bibcode:2016ChSCh...9..403G.doi:10.1002/cssc.201501046.PMID26530809.
  26. ^Lin, P.; Wang, R.Z.; Xia, Z.Z.; Ma, Q. (June 2011)."Ammonia–water absorption cycle: a prospective way to transport low-grade heat energy over long distance".International Journal of Low-Carbon Technologies.6(2): 125–133.doi:10.1093/ijlct/ctq053.
  27. ^Shokati, Naser; Khanahmadzadeh, Salah (August 2018). "The effect of different combinations of ammonia-water Rankine and absorption refrigeration cycles on the exergoeconomic performance of the cogeneration cycle".Applied Thermal Engineering.141:1141–1160.Bibcode:2018AppTE.141.1141S.doi:10.1016/j.applthermaleng.2018.06.052.S2CID115749773.
  28. ^"Das Zweidruckverfahren von Uhde - Düngemittelanlagen".Industrial Solutions(in German).Retrieved2021-12-08.
  29. ^"Ajinomoto Co., Inc., UMI, and Tokyo Institute of Technology Professors Establish New Company to implement the World's First On Site Production of Ammonia".Ajinomoto.27 April 2017.Retrieved22 November2021.
  30. ^"Technology / Business Introduction".Tsubame BHB.27 April 2017.Retrieved22 November2021.
  31. ^Baraniuk, Chris (27 February 2024)."Why firms are racing to produce green ammonia".BBC News.
  32. ^"This is exactly why we're running out of CO2 for beer and meat production".iNews.2018-06-28.
  33. ^"Why is there a CO2 shortage and how will it hit food supplies?".BBC News.2021-09-20.Retrieved2021-09-21.
  34. ^"Gas crisis: No chance lights will go out, says government".BBC News.2021-09-20.Retrieved2021-09-21.

Works cited

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