Selective Oxidation of n-Butane on a V–P–O Catalyst: Study under Fuel-Rich Conditions

Mota, S.; Abon, M.; Volta, J.C.; Dalmon, J.A.

doi:10.1006/jcat.2000.2902

Cited by 34 publications

(16 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, substantial amounts of C deposits accumulated on the catalyst, in the fraction of bed that operated under low oxygen partial pressure. The same conclusions were reached by Volta et al [110]: the reduction of V 5+ and the formation of C deposits were responsible for the decrease of the selectivity to MA. One way to overcome these limitations is to add promoters that help to maintain a higher V oxidation degree, probably through the formation of specific compounds, or through a mediation of V re-oxidation in the redox mechanism.…”

Section: Reactivity Under N-butane-rich Conditions and The Role Of Tsupporting

confidence: 70%

VPO catalyst for n-butane oxidation to maleic anhydride: A goal achieved, or a still open challenge?

et al. 2006

View full text Add to dashboard Cite

A Partner of Concorde CA and of Idecat NoE, 6FP of the EU) b Lonza SpA, via E. Fermi 51, 24020 Scanzorosciate (BG), ItalyThis review describes recent findings in the oxidation of n-butane to maleic anhydride. The process is commercial since the 80's, but yet the yield is far from being optimised. Therefore, it represents an emblematic example of how several scientific disciplines, from solid-state science to reactor technology, can contribute to the improvement of the process performance.KEY WORDS: Vanadyl pyrophosphate; n-butane; selective oxidation; maleic anhydride 1. The oxidation of n-butane catalysed by VPO: How to improve process performance?The activation of light alkanes by high-temperature contact with a redox catalyst represents one way to transform these hydrocarbons to valuable chemicals (a few reviews and books dealing with this topic, published after 1998, are refs [1-18]). The most successful example is the oxidation of n-butane to maleic anhydride (MA), catalysed by a V/P/O-based catalyst (VPO), which starting from the 80's has been replacing in part the commercial synthesis from benzene. This reaction, and the unique chemical-physical properties of the vanadyl pyrophosphate (VO) 2 P 2 O 7 (VPP), the active and selective phase for this reaction, are amongst the most studied topics in catalysis during the latest decades, initially with the aim of understanding which catalyst peculiarities make this complex transformation possible, and later on with the aim of improving the process performance.MA finds its major use in the production of unsaturated polyesters and of butanediol. The yearly world consumption exceeds 1.3 · 10 6 metric tons [19]. Approximately 70% is produced by n-butane oxidation, the remaining still being obtained from benzene. There are several reactor technologies available, including fixed-bed (Scientific Design, Huntsman, BASF, Pantochim), fluidised-bed (Lonza, BP, Mitsubishi), and transported-bed (DuPont). Best process performances reported in patent literature range from 53 to 65% molar yield to MA [20][21][22][23][24][25], with a conversion of the hydrocarbon not higher than 85-86%. An excellent result of more than 70% yield is reported [26], which however refers to a recycle process. In lab reactors best yields reported are lower than 50%.The best performance for a fixed-bed reactor does not exceed 65% per-pass yield, while that in a fluidised-bed is typically somewhat lower; in fact, back-mixing phenomena are responsible for the consecutive combustion of MA. Moreover, with fluidised-bed operation n-butane-richer conditions can be used (up to 5 molar % in feed); under the latter conditions, a worsening of selectivity is expected, which however is compensated by a considerable improvement in MA productivity. In the fluidised-bed process developed by Lonza and Lummus (shown in figure 1), the loss of selectivity is also compensated by the higher amount of high-pressure steam produced, due to the more efficient removal of the reaction heat and to the more CO x produced.The maximu...

show abstract

Section: Reactivity Under N-butane-rich Conditions and The Role Of Tsupporting

confidence: 70%

VPO catalyst for n-butane oxidation to maleic anhydride: A goal achieved, or a still open challenge?

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Mallada et al (2000a,b,c) and Mota et al (2000) studied in detail the effect of fuel rich conditions in the partial oxidation of butane. Some attempts have been made to develop kinetic models using unsteady-state conditions.…”

Section: Introductionmentioning

confidence: 98%

A generalized kinetic model for the partial oxidation of n-butane to maleic anhydride under aerobic and anaerobic conditions

Gascón

Valenciano

Téllez

et al. 2006

Chemical Engineering Science

View full text Add to dashboard Cite

“…In the second and third scenarios, the feeding points were equally spaced and uniformly distributed along the reactor wall so that the total amount of oxygen fed to these reactor configurations is the same as for the PBR. It is worth noting that previous work reported that a reductive atmosphere at the entrance of the bed leads to a decrease in the reactor performance. Therefore, part of the oxygen was co‐fed with butane to ensure oxidising conditions at the inlet of the catalyst bed.…”

Section: Resultsmentioning

confidence: 99%

“…This value is used in model validation simulations. For other simulations,

(y_{{normalO}_{2}} / y_{{normalC}_{4}}) inlet = 12

…”

Section: The Process Modelmentioning

confidence: 99%

Maleic anhydride production in a cross‐flow reactor: A comparative study

Ali

Alhumaizi

2014

Can J Chem Eng

View full text Add to dashboard Cite

The utilisation of cross‐flow reactor (CFR) in maleic anhydride (MA) production by direct oxidation of n‐butane is analysed. The CFR is described by a series of experimentally proven packed‐bed reactor (PBR) segments with specific oxygen dosing for each segment. The MA is up to 35 higher in a CFR compared to a comparative PBR. However, increasing the number of oxygen feeding points, from 4 to 10, resulted in only a slight increase in yield. Moreover, the increase in reactor cooling bath temperature was found to raise the temperature inside the conventional reactor considerably; meanwhile, temperature increase in the corresponding CFR is limited. The use of different oxygen feeding policies; namely equal, increasing and decreasing policies, caused only a minor effect on CFR performance. The advantage in MA yield through use of CFR is diminished as the residence time increases. Since CFR can be safely operated with higher butane inlet concentrations and higher reactor temperature, it represents an interesting alternative for use at industrial‐scale operation.

show abstract

Selective Oxidation of n-Butane on a V–P–O Catalyst: Study under Fuel-Rich Conditions

Cited by 34 publications

References 36 publications

VPO catalyst for n-butane oxidation to maleic anhydride: A goal achieved, or a still open challenge?

VPO catalyst for n-butane oxidation to maleic anhydride: A goal achieved, or a still open challenge?

A generalized kinetic model for the partial oxidation of n-butane to maleic anhydride under aerobic and anaerobic conditions

Maleic anhydride production in a cross‐flow reactor: A comparative study

Contact Info

Product

Resources

About