Water pollution is characterized mainly by the volume of waste to be treated and by the nature, concentration and toxicity of pollutants that form it. These parameters are all factors that have to be taken into account when choosing the treatment method to use. Due to its presence in various processes in pharmaceutical, chemical and petrochemical industry, where it is used either as reagent, intermediate substance or solvent, phenol and its derivatives are known as one of the most common organic water pollutants.
Aktivnost i stabilnost pripravljenih katalizatora ispitana Cwpo process u reakciji oksidacije fenola vodikovim peroksidom u vodenoj otopini.
The most important and the most vulnerable part of the global ecosystem are surface waters. Tothis day, numerous scientific investigations have been conducted in to develop new technologies for most effective purification of wastewaters polluted with organic compounds such as phenol and its derivatives.
Catalytic wet peroxide oxidation, known as the CWPO process, is one of the methods that can be used for the minimization Cwpo process organic pollution in practice. With the use of a catalyst homogeneous or heterogeneousthe process can be successfully operated under mild conditions with low energy consumption atmospheric pressure and temperatures below K.
Zeolites modified with copper possess good catalytic properties when compared to the other types of heterogeneous catalysts tested in CWPO reaction. Based on the literature overview and actual trends in scientific research concerning development of new catalytic oxidation processes for treatment of wastewaters burdened with organic pollutants, Y-5 FAU type of zeolite was selected as catalyst support for copper cations.
In this paper, second in a series, investigated was the influence of reaction parameters, synthesis and postsynthesis chemical and thermal treatment of the prepared catalyst on its catalytic properties. The catalyst was prepared by ion exchange method of the protonic form of commercial zeolite.
In order to obtain the catalyst with optimum catalytic properties, chemical H2SO4 wash and thermal postsynthesis treatment calcination was conducted. The catalysts were characterized with powder X-ray diffraction PXRD and AAS elemental analysis, while the adsorption techniques were used for the measurement of the specific surface area.
Activity and stability of such prepared catalysts was tested in catalytic wet peroxide oxidation of phenol in aqueous medium.
The mass fraction of the active metal component on the zeolite was 3. The postsynthesis treatment had a profound positive impact on the stability of both the catalytically active component and the support of the catalyst.
At the same time, its activity in the CWPO process remained very good or had even improved. With the use of a copper bearing zeolite based catalyst, the complete removal of phenol is obtained even when substoichiometric quantity of oxidant is used.
Bearing that in mind, future research will be oriented towards the application of these catalysts in the CWPO process with industrial grade effluents that contain phenol and other phenolic compounds. Good results on model phenolic wastewaters are indicative of its possibly successful integration into the existing industrial and municipal wastewater treatment facilities.
In that case, some of the by-products of CWPO phenol oxidation, such as acetic acid, could be used as a substrate.
The kinetic parameters were estimated using the Nelder-Mead method of nonlinear regression. Good accordance between the experimental dots and theoretical data lines was obtained. The kinetic model used for hydrogen peroxide decomposition showed somewhat less compliance with the experimental data.
This can be attributed to the fact that hydrogen peroxide present in the reactor participates not only in the oxidation of phenol molecules but in other reactions such as oxidation of intermediates, hydrogen peroxide dissociation, decomposition on the reactor wall, which contributes to its ineffective dispense in this reaction system Topics: Croatian Society of Chemical Engineers Year: Sorry, we are unable to provide the full text but you may find it at the following location s:The experimental profiles for phenol and TOC conversions using hydrogen peroxide as promoter in CWAO have been compared to those obtained in the CWAO and CWPO process.
Acquired experimental data was tested to a proposed kinetic model for . For the CWPO of phenol process with copper- or iron-containing catalysts, there is a critical problem that the leaching of the active metal element from the support would lessen the longevity of the catalyst.
applications  therefore, catalytic wet peroxide oxidation (CWPO) is proposed to relax the oxidation conditions  represents an interesting alternative to treat this kind of effluents, using solid catalysts makes the process more.
It was determined that the efficiency of the PP-CWAO process is higher than the efficiency of the CWAO and CWPO processes due to synergic impact of oxygen and hydrogen peroxide on the level of.
The process was originally designed and optimized in Aspen Plus , while the utilities were designed and simulated in Apen HTFS+. The optimization of the process took place through the variation of the distillation vacuum inside the first distillation column separating the majority of biodiesel from the triglyceride ashio-midori.com: Corporate Innovation Graduate at .
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