scholarly journals Oligocat: Oligoesters as Pseudo-Homogenous Catalysts for Biodiesel Synthesis

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 210
Author(s):  
Vitor Vlnieska ◽  
Aline Silva Muniz ◽  
Angelo Roberto dos Santos Oliveira ◽  
Maria Aparecida Ferreira César-Oliveira ◽  
Danays Kunka
Keyword(s):  
Conversion Rate ◽  
First Generation ◽  
Second Generation ◽  
Reaction Medium ◽  
Acid Catalyst ◽  
Biodiesel Production ◽  
European Federation ◽  
Alkyl Esters ◽  
Production Chain ◽  
Biodiesel Synthesis

Biodiesel production from first-generation feedstock has shown a strong correlation with the increase in deforestation and the necessity of larger areas for land farming. Recent estimation from the European Federation for Transport and Environment evidenced that since the 2000s decade, an area equal to the Netherlands was deforested to supply global biodiesel demand, mainly originating from first-generation feedstock. Nevertheless, biodiesel is renewable, and it can be a greener source of energy than petroleum. A promising approach to make biodiesel independent from large areas of farming is to shift as much as possible the biodiesel production chain to second and third generations of feedstock. The second generation presents three main advantages, where it does not compete with the food industry, its commercial value is negligible, or none, and its usage as feedstock for biodiesel production reduces the overall waste disposal. In this manuscript, we present an oligomeric catalyst designed to be multi-functional for second-generation feedstock transesterification reactions, mainly focusing our efforts to optimize the conversion of tallow fat and sauteing oil to FAME and FAEE, applying our innovative catalyst. Named as Oligocat, our catalyst acts as a Brønsted-Lowry acid catalyst, providing protons to the reaction medium, and at the same time, with the course of the reaction, it sequesters glycerol molecules from the medium and changes its physical phase during the transesterification reaction. With this set of properties, Oligocat presents a pseudo-homogenous behavior, reducing the purification and separation steps of the biodiesel process production. Reaction conditions were optimized applying a 42 factorial planning. The output parameter evaluated was the conversion rate of triacylglycerol to mono alkyl esters, measured through gel permeation chromatography (GPC). After the optimization studies, a conversion yield of 96.7 (±1.9) wt% was achieved, which allows classifying the obtained mono alkyl esters as biodiesel by ASTM D6751 or EN 14214:2003. After applying the catalyst in three reaction cycles, Oligocat still presented a conversion rate above 96.5 wt% and as well an excellent recovery rate.

scholarly journals Magnetic Nano-Sized Solid Acid Catalyst Bearing Sulfonic Acid Groups for Biodiesel Synthesis

2018 ◽  
Vol 16 (1) ◽  
pp. 923-929 ◽  
Author(s):  
Sezer Erdem ◽  
Beyhan Erdem ◽  
Ramis Mustafa Öksüzoğlu
Keyword(s):  
Magnetic Nanoparticles ◽  
Solid Acid Catalyst ◽  
Reaction Medium ◽  
Chlorosulfonic Acid ◽  
Acid Catalyst ◽  
Magnetic Core ◽  
Biodiesel Production ◽  
Silica Layer ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Biodiesel Synthesis

AbstractIn our approach for magnetic iron oxide nanoparticles surface modification, the fabrication of an inorganic shell, consisting of silica by the deposition of preformed colloids onto the nanoparticle surface and functionalization of these particles, was realized. The magnetic nanoparticles, non-coated and coated with silica layer by Stöber method, are functionalized with chlorosulfonic acid. The magnetic nanoparticles (MNPs), in size of 10-13 nm, could be used as acid catalyst in biodiesel production and show superparamagnetic character. The prepared nanoparticles were characterized by different methods including XRD, EDX, FT-IR and VSM. The catalytic activity of the coated and non-coated solid acids was examined in palmitic acid-methanol esterification as an industrial reaction for biodiesel synthesis. Although thin silica layer results in only a minor obstacle with respect to magnetism, it can accelerate the mass transportation due to its relatively porous structure and magnetic core may be more stable in the acidic reaction medium by means of covering process. Accordingly, coating strategy can be efficient way for allowing applications of MNPs in acid catalyzed esterification.

scholarly journals Study of Soybean Oil Hydrolysis Catalyzed by Thermomyces lanuginosus Lipase and Its Application to Biodiesel Production via Hydroesterification

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Elisa d'Avila Cavalcanti-Oliveira ◽  
Priscila Rufino da Silva ◽  
Alessandra Peçanha Ramos ◽  
Donato Alexandre Gomes Aranda ◽  
Denise Maria Guimarães Freire
Keyword(s):  
Soybean Oil ◽  
Methyl Esters ◽  
Reaction Medium ◽  
Acid Catalyst ◽  
Biodiesel Production ◽  
Thermomyces Lanuginosus ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Thermomyces Lanuginosus Lipase ◽  
Niobic Acid

The process of biodiesel production by the hydroesterification route that is proposed here involves a first step consisting of triacylglyceride hydrolysis catalyzed by lipase from Thermomyces lanuginosus (TL 100L) to generate free fatty acids (FFAs). This step is followed by esterification of the FFAs with alcohol, catalyzed by niobic acid in pellets or without a catalyst. The best result for the enzyme-catalyzed hydrolysis was obtained under reaction conditions of 50% (v/v) soybean oil and 2.3% (v/v) lipase (25 U/mL of reaction medium) in distilled water and at 60∘C; an 89% conversion rate to FFAs was obtained after 48 hours of reaction. For the esterification reaction, the best result was with an FFA/methanol molar ratio of 1:3, niobic acid catalyst at a concentration of 20% (w/w FFA), and 200∘C, which yielded 92% conversion of FFAs to soy methyl esters after 1 hour of reaction. This study is exceptional because both the hydrolysis and the esterification use a simple reaction medium with high substrate concentrations.

Non-Edible Oil Biodiesel Production via Microwave Irradiation Technologies Using Waste-Heterogeneous Catalyst Derived From Natural Calcium Oxide

2020 ◽  
pp. 92-111
Author(s):  
Mahanum Mohd Zamberi ◽  
Farid Nasir Ani
Keyword(s):  
Microwave Irradiation ◽  
Heterogeneous Catalyst ◽  
First Generation ◽  
Agricultural Sector ◽  
Edible Oils ◽  
Continuous Process ◽  
Biodiesel Production ◽  
Economic Methods ◽  
Biodiesel Synthesis ◽  
The Cost

Biodiesel production or synthesis by non-edible oils has been introduced recently due to its potential to overcome the problems associated with first generation of feedstock, especially the competition between food and transport biofuel. The production of this non-edible resource could be done without major investment and benefit many parties involved: agricultural sector, job creator, biodiversity, and many other benefits. Microwave-assisted technique has been found as one of the methods that has the potential to be a highlight due to its ability to reduce the cost production and produce higher quality biodiesel as well. This method has been identified to enhanced and accelerate the transesterification process in order to obtain higher yields in the biodiesel synthesis. Continuous process in the other hand seems to be more significant when compared to batch solution. This review is an attempt to gather and summarize the existing literature and study the natural heterogeneous catalyst as one of the green and economic methods using microwave irradiation method.

scholarly journals Biodiesel Production Processes and Sustainable Raw Materials

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4408 ◽  
Author(s):  
Ramos ◽  
Dias ◽  
Puna ◽  
Gomes ◽  
Bordado
Keyword(s):  
Vegetable Oils ◽  
Energy Security ◽  
Cost Reduction ◽  
First Generation ◽  
Raw Materials ◽  
Biodiesel Production ◽  
Environmental Concerns ◽  
Alkyl Esters ◽  
Animal Fats ◽  
Cooking Oils

Energy security and environmental concerns, related to the increasing carbon emissions, have prompted in the last years the search for renewable and sustainable fuels. Biodiesel, a mixture of fatty acids alkyl esters shows properties, which make it a feasible substitute for fossil diesel. Biodiesel can be produced using different processes and different raw materials. The most common, first generation, biodiesel is produced by methanolysis of vegetable oils using basic or acid homogeneous catalysts. The use of vegetable oils for biodiesel production raises serious questions about biodiesel sustainability. Used cooking oils and animal fats can replace the vegetable oils in biodiesel production thus allowing to produce a more sustainable biofuel. Moreover, methanol can be replaced by ethanol being totally renewable since it can be produced by biomass fermentation. The substitution of homogeneous catalyzed processes, nowadays used in the biodiesel industry, by heterogeneous ones can contribute to improve the biodiesel sustainability with simultaneous cost reduction. From the existing literature on biodiesel production, it stands out that several strategies can be adopted to improve the sustainability of biodiesel. A literature review is presented to underline the strategies allowing to improve the biodiesel sustainability.

scholarly journals Micro-Reactor Device For Dbsa-catalyzed Biodiesel Synthesis from Microalgae Chlorella Sp.

2020 ◽  
Vol 173 ◽  
pp. 01005
Author(s):  
Ali A. Jazie ◽  
Mustafa Jawad Nuhma ◽  
Hassan Abdulkadhim Abbas ◽  
Hajar Alias
Keyword(s):  
Residence Time ◽  
Maximum Yield ◽  
Acid Catalyst ◽  
Batch Process ◽  
Biodiesel Production ◽  
Synthesis Process ◽  
Dodecylbenzenesulfonic Acid ◽  
Highly Active ◽  
Biodiesel Synthesis ◽  
Micro Reactor

The micro-reactor device was fabricated from Teflon and tested as a tool for biodiesel synthesis process from micro algae using Dodecylbenzenesulfonic acid catalyst. The variables influenceing on the biodiesel yield were optimized. The maximum yield of biodiesel of 99% was obtained at the reaction conditions of (temperature: 373.15 K, residence time: 20 min, methanol/oil ratio: 20, co-solvent amount: 30 wt% and catalyst amount: 11wt%). The influence of water content also investigated and recommended to be less than 0.5 wt %. The acid value also reduced to a value of less than 0.5 % at the optimum reaction condition. DBSA was found highly active catalyst for the esterification and transesterification reaction in the micro – reactor device. Biodiesel was produced in microreactor device at a small residence time (20 min) compared to the very long time consumed by the conventional batch process. Isopropanol was used as a co-solvent in the process and showed highly active in the biodiesel production.

scholarly journals Biodiesel production from alternative raw materials using a heterogeneous low ordered biosilicified enzyme as biocatalyst

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Gabriel Orlando Ferrero ◽  
Edgar Maximiliano Sánchez Faba ◽  
Griselda Alejandra Eimer
Keyword(s):  
Active Sites ◽  
Second Generation ◽  
Raw Materials ◽  
Raw Material ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
High Porosity ◽  
Waste Frying Oil ◽  
Promising Alternative ◽  
Biodiesel Synthesis

Abstract Background Cumulative reported evidence has indicated that renewable feedstocks are a promising alternative source to fossil platforms for the production of fuels and chemicals. In that regard, the development of new, highly active, selective, and easy to recover and reuse catalysts for biomass conversions is urgently needed. The combination of enzymatic and inorganic heterogeneous catalysis generates an unprecedented platform that combines the advantages of both, the catalytic efficiency and selectivity of enzymes with the ordered structure, high porosity, mechanical, thermal and chemical resistance of mesoporous materials to obtain enzymatic heterogeneous catalysts. Enzymatic mineralization with an organic silicon precursor (biosilicification) is a promising and emerging approach for the generation of solid hybrid biocatalysts with exceptional stability under severe use conditions. Herein, we assessed the putative advantages of the biosilicification technology for developing an improved efficient and stable biocatalyst for sustainable biofuel production. Results A series of solid enzymatic catalysts denominated LOBE (low ordered biosilicified enzyme) were synthesized from Pseudomonas fluorescens lipase and tetraethyl orthosilicate. The microscopic structure and physicochemical properties characterization revealed that the enzyme formed aggregates that were contained in the heart of silicon-covered micelles, providing active sites with the ability to process different raw materials (commercial sunflower and soybean oils, Jatropha excisa oil, waste frying oil, acid oil from soybean soapstock, and pork fat) to produce first- and second-generation biodiesel. Ester content ranged from 81 to 93% wt depending on the raw material used for biodiesel synthesis. Conclusions A heterogeneous enzymatic biocatalyst, LOBE4, for efficient biodiesel production was successfully developed in a single-step synthesis reaction using biosilicification technology. LOBE4 showed to be highly efficient in converting refined, non-edible and residual oils (with high water and free fatty acid contents) and ethanol into biodiesel. Thus, LOBE4 emerges as a promising tool to produce second-generation biofuels, with significant implications for establishing a circular economy and reducing the carbon footprint.

scholarly journals Biodiesel production from alternative raw materials using a heterogeneous Low Ordered Biosilicified Enzyme as biocatalyst

2020 ◽  
Author(s):  
Gabriel Orlando Ferrero ◽  
Edgar Maximiliano Sánchez Faba ◽  
Griselda Alejandra Eimer
Keyword(s):  
Active Sites ◽  
Second Generation ◽  
Raw Materials ◽  
Raw Material ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
High Porosity ◽  
Waste Frying Oil ◽  
Promising Alternative ◽  
Biodiesel Synthesis

Abstract Background: Cumulative reported evidence has indicated that renewable feedstocks are a promising alternative source to fossil platforms for the production of fuels and chemicals. In that regard, the development of new, highly active, selective, and easy to recover and reuse catalysts for biomass conversions is urgently needed. The combination of enzymatic and inorganic heterogeneous catalysis generates an unprecedented platform that combines the advantages of both, the catalytic efficiency and selectivity of enzymes with the ordered structure, high porosity, mechanical, thermal and chemical resistance of mesoporous materials to obtain enzymatic heterogeneous catalysts. Enzymatic mineralization with an organic silicon precursor (biosilicification) is a promising and emerging approach for the generation of solid hybrid biocatalysts with exceptional stability under severe use conditions. Herein, we assessed the putative advantages of the biosilicification technology for developing an improved efficient and stable biocatalyst for sustainable biofuel production. Results: A series of solid enzymatic catalysts denominated LOBE (Low Ordered Biosilicified Enzyme) were synthesized from Pseudomonas fluorescens lipase and tetraethyl orthosilicate. The microscopic structure and physicochemical properties characterization revealed that the enzyme formed aggregates that were contained in the heart of silicon-covered micelles, providing active sites with the ability to process different raw materials (commercial sunflower and soybean oils, Jatropha excisa oil, waste frying oil, acid oil from soybean soapstock, and pork fat) to produce first and second generation biodiesel. Ester content ranged from 81 to 93% wt depending on the raw material used for biodiesel synthesis. Conclusions: A heterogeneous enzymatic biocatalyst, LOBE4, for efficient biodiesel production was successfully developed in a single step synthesis reaction using biosilicification technology. LOBE4 showed to be highly efficient in converting refined, non-edible and residual oils (with high water and free fatty acid contents) and ethanol into biodiesel. Thus, LOBE4 emerges as a promising tool to produce second-generation biofuels, with significant implications for establishing a circular economy and reducing the carbon footprint.

scholarly journals Synthesis and Chemical Functionalization of Pseudo-Homogeneous Catalysts for Biodiesel Production—Oligocat

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 19
Author(s):  
Vitor Vlnieska ◽  
Aline S. Muniz ◽  
Angelo R. S. Oliveira ◽  
Maria A. F. César-Oliveira ◽  
Danays Kunka
Keyword(s):  
First Generation ◽  
Preliminary Investigation ◽  
Reaction Medium ◽  
Biodiesel Production ◽  
Solid Catalyst ◽  
Homogeneous Catalyst ◽  
Resonance Spectroscopy ◽  
Chemical Functionalization ◽  
Conversion Rates

With the increase in global demand for biodiesel, first generation feedstock has drawn the attention of governmental institutions due to the correlation with large land farming areas. The second and third feedstock generations are greener feedstock sources, nevertheless, they require different catalytic conditions if compared with first generation feedstock. In this work, we present the synthesis and characterization of oligoesters matrices and their functionalization to act as a pseudo-homogeneous acid catalyst for biodiesel production, named Oligocat. The main advantage of Oligocat is given due to its reactional medium interaction. Initially, oligocat is a solid catalyst soluble in the alcoholic phase, acting as a homogeneous catalyst, providing better mass transfer of the catalytic groups to the reaction medium, and as the course of the reaction happens, Oligocat migrates to the glycerol phase, also providing the advantage of easy separation of the biodiesel. Oligocat was synthesized through polymerization of aromatic hydroxy acids, followed by a chemical functionalization applying the sulfonation technique. Characterization of the catalysts was carried out by infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), and thermogravimetric analysis (TGA). The synthesized oligomers presented 5357 g·mol−1 (Mw) and 3909 g·mol−1 (Mn), with a moderate thermal resistance of approximately 175 °C. By sulfonation reaction, it was possible to obtain a high content of sulphonic groups of nearly 70 mol%, which provided the catalytic activity to the oligomeric matrix. With the mentioned physical–chemical properties, Oligocat is chemically designed to convert second generation feedstock to biodiesel efficiently. Preliminary investigation using Oligocat for biodiesel production resulted in conversion rates higher than 96.5 wt.%.

Do remittances differ depending on migration pathway and length of stay?

2016 ◽  
Vol 1 (1) ◽  
pp. 105-118
Author(s):  
Anita Pugliese ◽  
Julie Ray ◽  
Neli Esipova
Keyword(s):  
Length Of Stay ◽  
First Generation ◽  
Second Generation ◽  
Global Analysis ◽  
Large Sample ◽  
Migration Pathway ◽  
First Generation Migrants ◽  
Second Generation Migrants

This paper reports the results from Gallup’s global analysis of the likelihood of first-generation migrants, second-generation migrants and the native-born to send financial help in the form of money or goods to others inside or outside their respective country of residence. The findings in this paper are based on more than 450,000 interviews conducted through Gallup’s World Poll in 157 countries in 2012, 2013 and 2014. The sample includes more than 26,000 first-generation migrants and more than 20,000 second-generation migrants. The large sample enables Gallup to analyze first-generation migrants by the duration of their stay in their adopted country and compare their remittance behaviors with second-generation migrants and the native-born.

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