Deactivation and regeneration of TS-1/SiO2 catalyst for epoxidation of propylene with hydrogen peroxide in a fixed-bed reactor

Abstract The problems of process costs and pollution of residual waters in the textile industry require increasing attention due to the new ecological regulations and also those resulting from an economic point of view. Hence, the behavior of non-isothermal fixed-bed reactor applied for hydrogen peroxide decomposition by immobilized Terminox Ultra catalase attached onto the outer surface of glass beads was studied to determine the operational conditions at which hydrogen peroxide decomposition is most effectively. A dispersion model for bioreactor applied in this work, and verified experimentally, took into account the coupled mass and heat balances as well as the rate equation for parallel enzyme deactivation. The effect of feed temperature, feed flow rate, feed hydrogen peroxide concentration, and diffusional resistances were analysed. In the calculations the global effectiveness factor based on the external mass-transfer model developed previously was employed to properly predict the real bioreactor behavior.

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Catalytic wet hydrogen peroxide oxidation of a petrochemical wastewater

Water Science & Technology ◽

10.2166/wst.2010.875 ◽

2010 ◽

Vol 61 (7) ◽

pp. 1829-1836 ◽

Cited By ~ 6

Author(s):

M. I. Pariente ◽

J. A. Melero ◽

F. Martínez ◽

J. A. Botas ◽

A. I. Gallego

Keyword(s):

Hydrogen Peroxide ◽

Pilot Plant ◽

Fixed Bed ◽

Operating Conditions ◽

Fixed Bed Reactor ◽

Peroxide Oxidation ◽

Hydrogen Peroxide Oxidation ◽

Iron Leaching ◽

Pilot Plant Scale ◽

Interesting Alternative

Continuous Catalytic Wet Hydrogen Peroxide Oxidation (CWHPO) for the treatment of a petrochemical industry wastewater has been studied on a pilot plant scale process. The installation, based on a catalytic fixed bed reactor (FBR) coupled with a stirred tank reactor (STR), shows an interesting alternative for the intensification of a continuous CWHPO treatment. Agglomerated SBA-15 silica-supported iron oxide (Fe2O3/SBA-15) was used as Fenton-like catalyst. Several variables such as the temperature and hydrogen peroxide concentration, as well as the capacity of the pilot plant for the treatment of inlet polluted streams with different dilution degrees were studied. Remarkable results in terms of TOC reduction and increased biodegradability were achieved using 160°C and moderate hydrogen peroxide initial concentration. Additionally, a good stability of the catalyst was evidenced for 8 hours of treatment with low iron leaching (less than 1 mg/L) under the best operating conditions.

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Epoxidation of propylene with H2O2 catalyzed by supported TS-1 catalyst in a fixed-bed reactor: Experiments and kinetics

Chemical Engineering Journal ◽

10.1016/j.cej.2012.11.055 ◽

2013 ◽

Vol 215-216 ◽

pp. 306-314 ◽

Cited By ~ 51

Author(s):

Guoqiang Wu ◽

Yaquan Wang ◽

Lina Wang ◽

Wenping Feng ◽

Hainan Shi ◽

...

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor ◽

Epoxidation Of Propylene

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Treatment of Phenolic Effluents by Catalytic Wet Hydrogen Peroxide Oxidation over Fe2O3/SBA-15 Extruded Catalyst in a Fixed-Bed Reactor

Industrial & Engineering Chemistry Research ◽

10.1021/ie070165h ◽

2007 ◽

Vol 46 (13) ◽

pp. 4396-4405 ◽

Cited By ~ 67

Author(s):

Fernando Martínez ◽

Juan Antonio Melero ◽

Juan Ángel Botas ◽

M. Isabel Pariente ◽

Raúl Molina

Keyword(s):

Hydrogen Peroxide ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Peroxide Oxidation ◽

Hydrogen Peroxide Oxidation

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Analytical Determination of the Optimal Feed Temperature for Hydrogen Peroxide Decomposition Process Occurring in Bioreactor with a Fixed-Bed of Commercial Catalase

Catalysts ◽

10.3390/catal11010035 ◽

2020 ◽

Vol 11 (1) ◽

pp. 35

Author(s):

Ireneusz Grubecki

Keyword(s):

Hydrogen Peroxide ◽

Flow Rate ◽

Fixed Bed ◽

Decomposition Process ◽

Fixed Bed Reactor ◽

Analytical Determination ◽

Feed Flow Rate ◽

Feed Concentration ◽

Optimal Feed ◽

Feed Temperature

The hydrogen peroxide-immobilized commercial catalase system was chosen to estimate the optimal feed temperature (OFT) for fixed-bed reactor (FXBR). This feed temperature was obtained based on analytical solution by maximizing the time-averaged substrate conversion under a constant feed flow rate and temperature constraints. In calculations a set of partial differential equations describing the conservation equation for fixed-bed reactor, assuming plug flow and kinetic equation for the rate of enzyme parallel deactivation was taken into account. The model is based on kinetic, and mass-transfer parameters estimated previously in a real decomposition process of hydrogen peroxide (HP). The simulation showed that the OFT is strongly dependent on hydrogen peroxide feed concentration, feed flow rate and diffusional resistances expressed by biocatalyst global effectiveness factor. It has been shown that the more significant diffusional resistances and the higher HP conversions are, the higher the optimal feed temperature is. The calculated values of the OFT were verified with the experimental results obtained in the model reactor at selected values of the feed flow rate. Presented analysis poses a significant simplification in a numerical computational procedure and can be very useful for engineers to select the temperature condition at which bioreactor productivity is expected to be maximal.

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