Nonlinear dynamic estimation for a fixed-bed reactor with decaying catalysts

Cheng, Y.S.; Mongkhonsi, Tharathon; Kershenbaum, L.S.

doi:10.1016/0009-2509(96)00048-6

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…According to Dias et al (1996) in the temperature interval 260-340 °C under high flow rates and o-xylene conversion below 20% (i.e., in the beginning of the bed), a large quantity of TAR products blocking the catalyst surface reversibly is generated. Cheng et al (1996) show an activity below 1 in the first 40 cm of the bed, which agrees with the results obtained by us. But it increases sharply to 1 immediately after 40 cm.…”

Section: Resultssupporting

confidence: 93%

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Optimal Policies of Operation of a Fixed-Bed Reactor for Oxidation of o-Xylene into Phthalic Anhydride

Anastasov

Nikolov

1998

Ind. Eng. Chem. Res.

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Using the methods of mathematical simulation, the opportunities for application of a dual salt bath and a dual catalyst bed to the conventional and low air ratio processes of oxidation of o-xylene into phthalic anhydride are studied. It is established that both systems lead to a significant increase of the yield of the raw phthalic anhydride, as well as to a drastic reduction of the undesired side product phthalide. The optimal characteristics of a dual salt bath and a dual catalyst bed are determined. Experimental temperature profiles obtained in an industrial reactor for oxidation of o-xylene during all the time of catalyst use are studied. Both the nature of variation of the catalyst activity along the bed and its influence on the effectiveness of the process are defined.

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Section: Resultssupporting

confidence: 93%

“…The reversible deactivation is a result of (a) modification of the valence of V along the bed length, caused by the different ratio "oxygen-hydrocarbon" (Lopez-Isunza and Kershenbaum, 1992), and (b) deposition of volatile residual (TAR) products on the catalyst surface (Bond and Konig, 1982;Dias et al, 1994;Cheng et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

Optimal Policies of Operation of a Fixed-Bed Reactor for Oxidation of o-Xylene into Phthalic Anhydride

Anastasov

Nikolov

1998

Ind. Eng. Chem. Res.

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“…There the deactivation is most probably reversible and due to the deposition of residual tar products over the active catalyst surface. The authors of papers Dias et al (1994Dias et al ( , 1996 and Cheng et al (1996) also confirm such an assumption. As it was mentioned above, the last experimental data on the catalyst studied refer to a 3-year-old sample.…”

Section: Brazilian Journal Of Chemical Engineeringsupporting

confidence: 64%

Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride

Georgieva

Anastasov

Nikolov

2008

Braz. J. Chem. Eng.

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-The behavior of a high-productive V 2 O 5 -TiO 2 (anatase) supported O 4-28 catalyst for oxidation of o-xylene to phthalic anhydride was investigated in the first three years of its exploitation in industry. By using a suitable mathematical model, an identification problem was solved and activation profiles of the catalyst along a fixed bed located in the tubes of an industrial reactor were determined. Experimental temperature regimes and yields of the main and side products for different periods of the catalyst life were used. The proper technological regimes providing for a maximum yield according to the requirements of the catalyst producer company were defined.

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The role of catalyst activity on the steady state and transient behavior of an industrial-scale fixed bed catalytic reactor for the partial oxidation of o-xylene on V2O5/TiO2 catalysts

Castillo‐Araiza

López‐Isunza

2011

Chemical Engineering Journal

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Nonlinear dynamic estimation for a fixed-bed reactor with decaying catalysts

Cited by 10 publications

References 11 publications

Optimal Policies of Operation of a Fixed-Bed Reactor for Oxidation of o-Xylene into Phthalic Anhydride

Optimal Policies of Operation of a Fixed-Bed Reactor for Oxidation of o-Xylene into Phthalic Anhydride

Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride

The role of catalyst activity on the steady state and transient behavior of an industrial-scale fixed bed catalytic reactor for the partial oxidation of o-xylene on V2O5/TiO2 catalysts

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