Maximizing the profitability of integrated Fischer-Tropsch GTL process with ammonia and urea synthesis using response surface methodology

Ziaei, M; Panahi, M; Fanaei, MA; Rafiee, A; Khalilpour, KR

Maximizing the profitability of integrated Fischer-Tropsch GTL process with ammonia and urea synthesis using response surface methodology

Ziaei, M Panahi, M Fanaei, MA Rafiee, A Khalilpour, KR

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Publication Type:: Journal Article
Citation:: Journal of CO2 Utilization, 2020, 35 pp. 14 - 27
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Ziaei, M	en_US
dc.contributor.author	Panahi, M	en_US
dc.contributor.author	Fanaei, MA	en_US
dc.contributor.author	Rafiee, A	en_US
dc.contributor.author	Khalilpour, KR https://orcid.org/0000-0003-4104-2488	en_US
dc.date.issued	2020-01-01	en_US
dc.identifier.citation	Journal of CO2 Utilization, 2020, 35 pp. 14 - 27	en_US
dc.identifier.issn	2212-9820	en_US
dc.identifier.uri	http://hdl.handle.net/10453/139000
dc.description.abstract	© 2019 Elsevier Ltd. The integration of a natural gas to liquids (GTL) process with ammonia and urea synthesis units was conducted to utilize the emitted CO2 of the GTL process for the urea synthesis. The feedstocks of the ammonia synthesis unit including hydrogen and nitrogen were provided by a polymer electrolyte membrane (PEM) electrolyzer and air separation unit (ASU) of the GTL process, respectively. The required power for the PEM modules was assumed to be supplied by the surplus generated power of the GTL process. To enhance the overall carbon efficiency and profitability of the three processes, the emitted CO2 from the GTL process was utilized in the urea synthesis unit. Multi-objective optimization approach was conducted to determine the optimal values of carbon efficiency and wax production rate of the GTL process. Objective functions were calculated by response surface methodology with second-order polynomial regression. The degrees of freedom were defined as follows: Unpurged ratio of recycled tail gas from Fischer-Tropsch (FT) reactor, recycle ratio of the GTL tail gas to the FT reactor, CO2 removal percentage from the GTL process synthesis gas (syngas) section, steam to carbon ratio to pre-reformer, molar flow of feed to the ammonia synthesis unit, and CO2 intake to the urea unit. The presented integration results in the production of about 434,000»tonnes/year urea in addition to the FT-derived products. 13.71% (37»tonnes/h) of the produced CO2 in the GTL process is utilized in the urea production unit and the profitability of the integrated process is enhanced by 8%.	en_US
dc.relation.ispartof	Journal of CO2 Utilization	en_US
dc.relation.isbasedon	10.1016/j.jcou.2019.08.019	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Maximizing the profitability of integrated Fischer-Tropsch GTL process with ammonia and urea synthesis using response surface methodology	en_US
dc.type	Journal Article
utslib.citation.volume	35	en_US
utslib.for	0302 Inorganic Chemistry	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Information, Systems and Modelling
utslib.copyright.status	closed_access	*
pubs.publication-status	Published	en_US
pubs.volume	35	en_US

Abstract:

© 2019 Elsevier Ltd. The integration of a natural gas to liquids (GTL) process with ammonia and urea synthesis units was conducted to utilize the emitted CO2 of the GTL process for the urea synthesis. The feedstocks of the ammonia synthesis unit including hydrogen and nitrogen were provided by a polymer electrolyte membrane (PEM) electrolyzer and air separation unit (ASU) of the GTL process, respectively. The required power for the PEM modules was assumed to be supplied by the surplus generated power of the GTL process. To enhance the overall carbon efficiency and profitability of the three processes, the emitted CO2 from the GTL process was utilized in the urea synthesis unit. Multi-objective optimization approach was conducted to determine the optimal values of carbon efficiency and wax production rate of the GTL process. Objective functions were calculated by response surface methodology with second-order polynomial regression. The degrees of freedom were defined as follows: Unpurged ratio of recycled tail gas from Fischer-Tropsch (FT) reactor, recycle ratio of the GTL tail gas to the FT reactor, CO2 removal percentage from the GTL process synthesis gas (syngas) section, steam to carbon ratio to pre-reformer, molar flow of feed to the ammonia synthesis unit, and CO2 intake to the urea unit. The presented integration results in the production of about 434,000»tonnes/year urea in addition to the FT-derived products. 13.71% (37»tonnes/h) of the produced CO2 in the GTL process is utilized in the urea production unit and the profitability of the integrated process is enhanced by 8%.

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http://hdl.handle.net/10453/139000