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Fischer–Tropsch-synthesis with nitrogen-rich syngas : Fundamentals and reactor design aspects

Title data

Jess, Andreas ; Popp, Rüdiger ; Hedden, Kurt:
Fischer–Tropsch-synthesis with nitrogen-rich syngas : Fundamentals and reactor design aspects.
In: Applied Catalysis A: General. Vol. 186 (1999) Issue 1–2 . - pp. 321-342.
ISSN 1873-3875
DOI: https://doi.org/10.1016/S0926-860X(99)00152-0

Official URL: Volltext

Abstract in another language

An option in bringing remote natural gas reserves to the market is its conversion by Fischer–Tropsch (F–T)-synthesis into diesel oil and wax. The use of nitrogen-rich syngas (50 vol.%) could be an alternative to classical processes with nitrogen-free syngas because the investment costs are probably lower: syngas is produced by partial oxidation with air, which eliminates the need for an air separation plant, and a process with nitrogen-rich syngas does not utilize a recycle loop and a recycle compressor. For the development of such a process, the kinetics of F–T-synthesis was studied on an Fe-catalyst, indicating that nitrogen only dilutes syngas, and therefore, has no influence on the kinetics if the partial pressures of carbon monoxide and hydrogen are kept constant. Subsequently, the F–T-synthesis with nitrogen-rich syngas was investigated in wall-cooled single tube reactors. Based on the experimental data, a mathematical model for industrial multitubular F–T-reactors was developed. Model calculations indicate that nitrogen plays an important role in the operation of multitubular reactors by helping to remove the heat generated by the F–T-reaction. This leads to an optimum diameter of the tubes of 70 mm for nitrogen-rich syngas with respect to a stable and safe operation of the reactor, whereas for nitrogen-free syngas, the diameter is limited to about 45 mm. The production rate of diesel oil and wax per tube is, in case of nitrogen-rich syngas, about three times higher, which will decrease the number of tubes and the investment costs of industrial multitubular reactors. Detailed economic studies are still necessary to validate or disprove whether and under which circumstances the proposed process with nitrogen-rich syngas is an attractive alternative to classical processes with nitrogen-free syngas, especially in areas with remote natural gas resources.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Fischer–Tropsch (F–T)-synthesis; Iron-catalyst; Nitrogen-rich syngas; Fixed bed reactor; Multitubular reactor; Parametric sensitivity
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 05 May 2015 09:47
Last Modified: 04 Sep 2015 07:52
URI: https://eref.uni-bayreuth.de/id/eprint/11768