High quality biodiesel from marine microalga, Scenedesmus sp. through in situ acid transesterification

In this study, new high‐quality experimental data for culturing green microalgae Scenedesmus in tubular and cylindrical split airlift photobioreactors were obtained under different operating conditions. The obtained experimental data of culturing microalgae Scenedesmus in a tubular photobioreactor were used for determining the kinetic parameters of the photosynthetic reaction. On the other hand, the culturing of green microalgae in a split airlift photobioreactor was used to measure the microalgae cell trajectory using an advanced radioactive particle tracking (RPT) technique. The obtained results in terms of kinetic parameters of the photosynthetic reaction and microalgae cell trajectory were integrated for the first time to obtain the three‐state dynamic growth model. This integration between dynamic growth and cell trajectories will provide a direct and comprehensive tool for photobioreactor analysis, which is essential for proper and efficient reactor design and scale‐up for large‐scale biomass production. © 2021 Society of Chemical Industry (SCI).

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integration of dynamic growth modeling and hydrodynamics in an internal‐loop split photobioreactor

Sabri

Ojha

Sultan

et al. 2021

“…Within the last few decades, there has been an increase in demand for fossil fuels as a consequence of global population growth and industrialization. [1][2][3] Unluckily, this consumption has brought about destructive effects on the environment, including pollution and global warming. [4][5][6][7] One solution to this problem is using renewable fuels and, among various types of fuels, biodiesel, has several potential advantages over diesel, [8][9][10][11] as it is renewable and nontoxic, and neither destroys the environment nor causes air pollution.…”

Section: Introductionmentioning

confidence: 99%

Modelling and optimization of main independent parameters for biodiesel production over a Cu_0.4Zn_0.6Al₂O₄ catalyst using an RSM method

Hashemzehi

Pirouzfar

Nayebzadeh

et al. 2021

In this research, the modeling of Cu0.4Zn0.6Al2O4 catalysts performance and optimizing of esterification reactions were considered by the central composite design (RSM) response method. The main independent parameters of temperature, the ratio of alcohol to oil, the amount of catalyst and time duration have been considered for setting the esterification process. To access the maximum activity in the esterification process, the optimum conditions are estimated at 10.42 the molar ratio of alcohol to oil, 2.98 wt.% for the amount of catalyst at the temperature of 163.37 °C and within 4.15 hrs. Under these conditions, the conversion will be above 97.94%. These conditions have been applied to adjust the process of transesterification of waste cooking oil. The reusability of the Cu0.4Zn0.6Al2O4 nanocatalyst in the esterification reaction was investigated in this study. Employed statistical techniques and developed models can be employed as a useful tool for design, prediction, and optimization of the biodiesel production process with effective performance for various industrial applications.

“…Among possible routes for FAME production from vegetable oils with a high content of free fatty acids, esterification reactions are considered as a promising alternative, allowing reducing costs, increasing sustainability in biodiesel production and minimizing natural resource consumption . Because the oleaginous reagent comprises 75% of the total cost of biodiesel production, the substitution of traditionally used refined oils with alternative glycerides with high fatty acid oils has been studied through esterification and transesterification reactions, with an homogeneous acid and heterogeneous catalyst in the presence of methanol or ethanol .…”

Section: Introductionmentioning

confidence: 99%

Assessment of niobium phosphate as heterogeneous catalyst in esterification with methyl acetate

Alves

Pinheiro

Brondani

et al. 2019

BACKGROUND The aim of this work was to investigate the esterification reaction from oleic acid with methyl acetate (MeA) catalyzed by niobium phosphate to produce methyl esters. This catalyst has an amorphous structure and large surface area. Catalytic tests were performed according to an experimental design. The results were analyzed statistically and all of the variables were significant, especially the temperature. RESULTS A kinetic study of the reaction was carried out and the most suitable reaction conditions were 240 °C, 10% (m/m) of catalyst and MeA: oleic acid molar ratio 10:1. After 2 h, it was possible to obtain ≈80% (m/m) methyl oleate content. A noncatalytic test corroborated niobium phosphate activity in the reaction. A kinetic model fitted experimental data for the catalyzed and noncatalyzed reactions; kinetics parameters for Arrhenius equation were estimated. In a reuse test, the catalyst showed a gradual decrease in catalytic activity over five reaction cycles. CONCLUSION Niobium phosphate can be considered as a promising heterogeneous catalyst for biodiesel synthesis. © 2019 Society of Chemical Industry