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Process optimization of oxidative coupling of methane for ethylene production using response surface methodology
Author(s) -
Thien Chua Yen,
Mohamed Abdul Rahman,
Bhatia Subhash
Publication year - 2007
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1640
Subject(s) - central composite design , oxidative coupling of methane , methane , response surface methodology , ethylene , factorial experiment , selectivity , chemistry , catalysis , design of experiments , space velocity , yield (engineering) , fractional factorial design , dilution , analytical chemistry (journal) , materials science , thermodynamics , chromatography , organic chemistry , mathematics , composite material , statistics , physics
The statistical design of experiments (DoE) was used in the process study of oxidative coupling of methane (OCM) over NaWMn/SiO 2 catalyst. A set of factors with a certain range was screened using factorial design with respect to three responses: methane conversion, C 2+ products selectivity and ethylene/ethane ratio. The variances were analyzed and the interaction effects of the process parameters were evaluated. With the understanding of the process, the optimization of the process was further studied using response surface methodology coupled with central composite design (CCD). The optimum conditions were obtained as reaction temperature = 850 °C, gas hourly space velocity = 23 947 cm 3 g −1 h −1 , catalyst pretreatment period = 2 h, dilution ratio = 0.2 and CH 4 /O 2 ratio = 7. 40.55% of methane conversion and 79.51% of C 2+ product selectivity were obtained under these optimum conditions. Experimental runs under optimum conditions were repeated and compared with the simulated values obtained from the model. There was good agreement between the experimental and simulated values. Copyright © 2007 Society of Chemical Industry