The objective of this study was to investigate the petroleum sorption capacities of plant fibers from Eucalyptus sp., Bambusa tuldoides and sugarcane bagasse fibers as an innovative and low cost alternative from renewable sources. The characterization of the fibers was performed according to their morphological aspects and physical-chemical characteristics. The oil used was classified according to

Methods of computational fluid dynamics and design of experiments are implemented in modeling the heat transfer of Al2O3/Water- EG nanofluid as a coolant in a car radiator system. The main purpose of the study is to propose a model to predict Nusselt number using the design of computer experiment. The response surface methodology is applied to investigate the effects of flow rate, nanoparticle concentration

Gallium is widely used in electronic devices. The development of Ga recovery technology is an important issue. In this study, D2EHPA-modified resin (DMR) is prepared by solvent-nonsolvent modification method. This method can improve the distribution and amount of immobilized D2EHPA in DMR. The amount of modified D2EHPA is 2.68 mmol g–1 of resins. The adsorption isotherm can be described with the Langmuir

In this study, vanadium (V) and yttrium (Y) were extracted from coal fly ash using a leaching process utilizing sulfuric acid (H2SO4) with assistance ultrasonic and hydrogen peroxide (H2O2). Response surface methodology (RSM) was used to optimize main factors including solid to liquid (S/L) ratio, H2SO4 percentage, and H2O2 percentage. At the optimal condition of 0.06% (w/v) of S/L ratio, 32.18% (v/v)

Glycerol is the main by-product of biodiesel plants, and new technological routes that use it as a raw material are being developed due to the increase in the global production of biofuels. One of the possible applications is in the production of acrylonitrile, a product with several industrial applications. This study proposed and analyzed the production process of acrylonitrile using crude glycerol

In this paper, hydro-deoxygenation (HDO) of Mixture 1 (acetic acid and phenol) and Mixture 2 (acetone, acetic acid, phenol, 4-ethylguaiacolis, furfural and water) as model bio-oils were performed to investigate the interactions. Ni2P/HZSM-5 catalysts exhibited higher activity than blank HZSM-5. The conversion rate of acetic acid enhanced with the increase of temperature, contrary to the value of phenol

Alkane production from fatty acids and their derivatives can be considered as one of the most studied process. Such reactions as hydrogenation, hydrodeoxygenation, decarboxylation and decarbonylation are the main routes for this process. The reaction pathway depends on the catalyst nature, hydrogen presence and hydrogen source. In this work, the mixture of unsaturated (oleic and linoleic) fatty acids

The absorption of model tar compounds (benzene, toluene, and xylene) in methyl oleate is studied in a fixed-bed absorption column. The dynamic system involving the recirculation of the tar-rich solvent is modeled as a combination of various steady-state snapshots in time, and this approach effectively predicts the performance of the absorber. The rate-based model shows a good agreement with the experimental

Banana rachis and low-density polyethylene (LDPE) were selected as secondary feedstocks for the study of fast pyrolysis in a free fall reactor. The experiments were performed at 600°C for banana rachis and 450°C for LDPE, based on literature and thermogravimetric analysis. The results showed a biochar yield of 71% for banana rachis and 42% for LDPE. The gaseous products of both feedstocks’ present

An influence of ultrasound amplitude on nucleation kinetics and properties of the final product of borax decahydrate has been investigated. Mechanical mixing in a 2.65 L stirred batch crystallizer was performed by using the straight blade turbine (SBT) to a complete suspension of crystals. Obtained results showed that continuous sonication affects nucleation kinetics, but also the properties of the

Small-scale biomass boilers contribute to the emission of particulate matter (PM) to the environment. In this study, the performance of a wet scrubber purification system for flue gas was experimentally investigated. The experimental setup consisted of a boiler, a wet scrubber, a generator, and heat exchangers. The results show an average particulate collection efficiency of around 42% for a particulate

The impact of air velocity and temperature on the drying curves of the invasive brown alga Sargassum muticum was studied. An air impingement dryer was used at five air velocities (7, 14, 21, 28 and 35 m s-1) at 40 °C and at four air temperatures (40, 50, 60 and 70 °C) at 35 m s1. Equilibrium moisture content was properly modeled by Oswin, Halsey and GAB models. Fick‧s diffusional model was applied

This study presents a comparative evaluation of physical and chemical treatments performed on coconut shell powder, in relation to the adsorption capacity of Cu+2/ Cd+2 ions. The chemical treatment consists of impregnation of Monoethanolamine (mass ratio of 1∶1) and microemulsion (composed of 10% mass Sodium Octanoate). The physical treatment was through steam explosion (P = 5 bar, T = 210 °C).Treatments

This work investigates the liquid-phase adsorption of n-butanol on Amberlyst™15 in the range of temperature 295–323 K at different initial adsorbate concentrations. The adsorbent was characterized by a series of techniques: N2 physisorption, FTIR adsorption of pyridine, SEM and PXRD. The information obtained confirmed the two porosity level structure of the adsorbent with an amorphous polymer structure

The possibility of introducing modern technology of plasma ignition of fuel in combustion chambers of power boilers has been investigated using 3D computer modeling methods. Computational experiments were carried out on operating boilers and a comparison of the characteristics of the combustion process for traditional fuel combustion and during its thermochemical preparation was carried out. Plasma

This paper deals with the potential of utilizing temperature-variable district heating systems in rural areas. A local district heating system in Germany and the related project NATAR are briefly described, measurement data is evaluated. Operational experiences with a seasonal temperature reduction and therefore advantages for different heat generation systems and heat storages are discussed. The analysis

The financial valuation of power plants is an important instrument for investment planning. The environment of the energy sector, which is strongly influenced by renewable energies, is changing. The shift to decentralised supply has an impact on the technical complexity of the energy system and requires congestion management. In such a transitioning system, flexibility is gaining a more important function

In the current work, novel screw-type reactor for the fast pyrolysis of agricultural waste (flax shive) is described. The preliminary study on the process parameter influence on the yield, composition, and properties of pyrolysis products was carried out. Based on the results obtained, the optimal conditions of the fast pyrolysis of flax shive particles were obtained as the following: feedstock particle

The monitoring and diagnosis of crystallization processes are difficult due to the interaction of nucleation and crystal growth phenomena. In recent years, image and time series analysis using fractal methodologies has shown potential as an alternative for monitoring crystal growth, although the available results are scarce. In this work, the Multifractal Detrended Fluctuation Analysis (MF-DFA) was

A method to intensify the mixing process of scalar components within shear-thinning fluids was proposed. A conical Taylor–Couette flow enabled fluid elements to circulate in the entire fluid column owing to the global circulation flow (i.e., meridional flow) for keeping good local mixing within Taylor cells. The global convection and mixing characteristics were numerically investigated. The meridional

Syngas is an important product of methane processing of natural gas, from which a wide range of chemical products can be obtained in the future. The paper presents the results of a study of the developed Ni multicomponent catalysts in the partial oxidation of CH4 to syngas. A series of samples with different percentages of active components in the Ni – Cr – Al – Mg – glycine catalyst was prepared by

A method for washing of highly concentrated suspensions with fine particles using a filter with overlapping discs is studied. For the experiments, alumina and titanium dioxide suspensions are used. It is demonstrated that the used suspensions have a non-Newtonian behavior. The viscosity is influenced by the type of particle system, the solid concentration and the shear rates. The washing process is

The reaction rate concepts in heterogeneous catalysis are based on well-defined and usually well quantified active sites. Such an active site is stable in time and its main features are typically constant. In heterogeneous photocatalysis the active site is of different nature. Its existence depends on the instantaneous availability of photons and the variable ability of the photocatalyst to use them