Optimization of the n-hexane isomerization process using response surface methodology

► We have investigated isomerization reactions on a zirconium sulfate catalyst. ► We apply response surface methodology to catalyst activity research. ► The second order polynomial model of the process is developed. ► The optimum reaction conditions were determined. Isomerization reactions on commer...

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Bibliographic Details
Published in:Chemical engineering research & design 2013-01, Vol.91 (1), p.100-105
Main Authors: Adzamic, Zoran, Adzamic, Tamara, Muzic, Marko, Sertic-Bionda, Katica
Format: Article
Language:English
Subjects:
Catalyst
Chemical engineering
Chemical engineers
Conversion
Design engineering
Isomerization
Isomers
n-Hexane
Optimization
Zirconium
Zirconium sulfate
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Summary:► We have investigated isomerization reactions on a zirconium sulfate catalyst. ► We apply response surface methodology to catalyst activity research. ► The second order polynomial model of the process is developed. ► The optimum reaction conditions were determined. Isomerization reactions on commercial zirconium sulfate catalyst are investigated in order to determine influence of hydrogen/feed ratio, space velocity and temperature on n-hexane conversion. Investigated range of inlet parameters includes values that are applied in the industrial practice of the isomerization process. Box–Behnken experimental design was carried out in order to optimize n-hexane isomerization process. Statistical analysis of experimental data was performed to obtain second order polynomial model and the optimum conditions were determined: hydrogen/feed ratio of 6, space velocity of 2h−1 and temperature of 170°C. At optimum conditions conversion of n-hexane was 70wt.%. In addition, temperature dependency of product composition was investigated at optimum values of hydrogen/feed ratio and space velocity. Obtained results show that methylpentanes greatly depend on temperature, unlike dimethylbutanes, in the studied range from 130 to 170°C. Isomer that was produced in highest quantities was 2-methylpentane, while 3-methylpentane forms in somewhat smaller amounts. 2,2- and 2,3-dimethylbutanes, which contribute the most to the octane number value, are formed in relatively small quantities, amounting to less than 10wt.% of the total amount of isomers formed.
ISSN:0263-8762
DOI:10.1016/j.cherd.2012.06.012