Application of Heteropolyacid-Based Heterogeneous Catalysts for Conversion of Oleochemicals into Renewable Fuels and other Value-Added Products

2013 ◽  
Vol 757 ◽  
pp. 1-24 ◽  
Author(s):  
Ali Sabri Badday ◽  
Ahmad Zuhairi Abdullah ◽  
Keat Teong Lee
Keyword(s):  
Fatty Acids ◽  
Heterogeneous Catalysts ◽  
New Technologies ◽  
Reaction Medium ◽  
Value Added ◽  
Acid Sites ◽  
Esterification Reaction ◽  
High Water Content ◽  
Active Components ◽  
Wide Range

Oleochemicals offer viable choices to replace petrochemicals in a wide range of applications such as fuels, lubricants and surfactants. Many of the conversions require the use of suitable solid acids as the catalysts. The chemical and physical properties of the feedstock in oleochemical processes often result in difficulties and challenges that limit the success. Large amount of free fatty acids and high water content create barriers towards the successful use of broad range of oleochemicals as raw materials. To overcome this problem, efforts have been dedicated to the development of new technologies involving new types of catalyst. Solid acid catalysts based on heteropolyacids (HPAs) for various oleochemical conversions especially esterification reaction of fatty acids and transesterification of vegetable oils have been successfully developed. This type of catalyst already secured a tangible success in solving some problems associated with the earlier types of catalyst leading to higher productivity in the process while satisfying the needs of sustainable and environmental friendly industrial processes. Incorporation of HPAs active component into mesoporous supports can produce heterogeneous catalysts with high acid sites dispersion, stability to high temperature, recyclable and they usually demonstrate low leaching of active components in the reaction medium. This article reviews common oleochemical processes where various HPA catalysts already found successful application with some insight into the specific characteristics of the catalysts. Their advantages and drawbacks as well as specific process behaviors in few important oleochemical conversions of industrial importance will be discussed.

scholarly journals Structural Change for Sustainable Development in Economy: A Literature Review

2021 ◽  
Vol 92 ◽  
pp. 08019
Author(s):  
Viktorija Sipilova
Keyword(s):  
Sustainable Development ◽  
Structural Change ◽  
New Technologies ◽  
Value Added ◽  
Subject Area ◽  
Economic Consequences ◽  
Research Experience ◽  
Suitable Material ◽  
General Terms ◽  
Wide Range

Research background: Climate change stimulates unfavorable global socio-economic consequences, which question economic structures, require sustainable development. Reaching sustainable development in economy relates to structural change. However, scientists rarely focus on structural change and sustainable development in the pure economic subject area. Purpose of the article: The article aims to summarize and classify the knowledge about contribution and potential of structural change for sustainable development in economy using research experience. The author considers the articles published exactly in the economic subject area, in which scientists terminologically focus on structural change and sustainable development. Methods: The search parameter - keywords and limitation - subject area determine the selection of suitable material for the research purpose. The author applies monographic method, logical analysis method, scientific induction method for the analysis of the selected material. Findings & Value added: The articles selected according to the limitations demonstrate that manufacturing is the most commonly analyzed sector followed by energy sector, tourism and decomposition of economy depending on sectoral efficiency. According to the material analyzed in the economic subject area, the contribution of structural change to sustainable development is considered in case studies with focus on decomposition of sectoral structure of local economies. Potential of structural change to sustainable development is considered in general terms and relates to energy efficiency, introduction of new technologies, and involvement of all stakeholders. Thus, it is possible to highlight the factors necessary for structural change, which work towards sustainable development in economy – attitude, efficiency, new technologies and wide range of participants.

scholarly journals Alkaline-Based Catalysts for Glycerol Polymerization Reaction: A Review

2020 ◽  
Author(s):  
Negisa Ebadipour ◽  
Sébastien Paul ◽  
Benjamin Katryniok ◽  
Franck Dumeignil
Keyword(s):  
Heterogeneous Catalysts ◽  
Antimicrobial Agents ◽  
Reaction Medium ◽  
Operating Conditions ◽  
Polymerization Reaction ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Glycerol Conversion ◽  
Advantages And Disadvantages ◽  
Wide Range

Polyglycerols (PGs) are biocompatible and highly functional polyols with a wide range of applications, such as emulsifiers, stabilizers, antimicrobial agents, in many industries including cosmetics, food, plastic and biomedical. The demand increase for biobased PGs encourages researchers to develop new catalytic systems for glycerol polymerization. This review focuses on alkaline homogeneous and heterogeneous catalysts. The performances of the alkaline catalysts are compared in terms of conversion and selectivity, and their respective advantages and disadvantages are commented. While homogeneous catalysts exhibit a high catalytic activity, they cannot be recycled and reused, whereas solid catalysts can be partially recycled. The key issue for heterogenous catalytic systems, which is unsolved so far, is linked to their instability due to partial dissolution in the reaction medium. Further, this paper also reviews the proposed mechanisms of glycerol polymerization over alkaline-based catalysts and discuss the various operating conditions with an impact on the performances. More particularly, temperature and amount of catalyst proved to have a significant influence on glycerol conversion and on its polymerization extent.

scholarly journals Reactive Chromatography Applied to Ethyl Levulinate Synthesis: A Proof of Concept

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1684
Author(s):  
Carmelina Rossano ◽  
Claudio Luigi Pizzo ◽  
Riccardo Tesser ◽  
Martino Di Serio ◽  
Vincenzo Russo
Keyword(s):  
Levulinic Acid ◽  
Separation Efficiency ◽  
Fixed Bed ◽  
Value Added ◽  
Low Flow ◽  
Esterification Reaction ◽  
Flow Rates ◽  
Ethyl Levulinate ◽  
Wide Range ◽  
Chromatographic Reactor

Levulinic acid (LA) has been highlighted as one of the most promising platform chemicals, providing a wide range of possible derivatizations to value-added chemicals as the ethyl levulinate obtained through an acid catalyzed esterification reaction with ethanol that has found application in the bio-fuel market. Being a reversible reaction, the main drawback is the production of water that does not allow full conversion of levulinic acid. The aim of this work was to prove that the chromatographic reactor technology, in which the solid material of the packed bed acts both as stationary phase and catalyst, is surely a valid option to overcome such an issue by overcoming the thermodynamic equilibrium. The experiments were conducted in a fixed-bed chromatographic reactor, packed with Dowex 50WX-8 as ion exchange resin. Different operational conditions were varied (e.g., temperature and flow rate), pulsing levulinic acid to the ethanol stream, to investigate the main effects on the final conversion and separation efficiency of the system. The effects were described qualitatively, demonstrating that working at sufficiently low flow rates, LA was completely converted, while at moderate flow rates, only a partial conversion was achieved. The system worked properly even at room temperature (303 K), where LA was completely converted, an encouraging result as esterification reactions are normally performed at higher temperatures.

scholarly journals Alkaline-Based Catalysts for Glycerol Polymerization Reaction: A Review

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1021
Author(s):  
Negisa Ebadipour ◽  
Sébastien Paul ◽  
Benjamin Katryniok ◽  
Franck Dumeignil
Keyword(s):  
Heterogeneous Catalysts ◽  
Antimicrobial Agents ◽  
Reaction Medium ◽  
Operating Conditions ◽  
Polymerization Reaction ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Glycerol Conversion ◽  
Advantages And Disadvantages ◽  
Wide Range

Polyglycerols (PGs) are biocompatible and highly functional polyols with a wide range of applications, such as emulsifiers, stabilizers and antimicrobial agents, in many industries including cosmetics, food, plastic and biomedical. The demand increase for biobased PGs encourages researchers to develop new catalytic systems for glycerol polymerization. This review focuses on alkaline homogeneous and heterogeneous catalysts. The performances of the alkaline catalysts are compared in terms of conversion and selectivity, and their respective advantages and disadvantages are commented. While homogeneous catalysts exhibit a high catalytic activity, they cannot be recycled and reused, whereas solid catalysts can be partially recycled. The key issue for heterogenous catalytic systems, which is unsolved thus far, is linked to their instability due to partial dissolution in the reaction medium. Further, this paper also reviews the proposed mechanisms of glycerol polymerization over alkaline-based catalysts and discusses the various operating conditions with an impact on performance. More particularly, temperature and amount of catalyst are proven to have a significant influence on glycerol conversion and on its polymerization extent.

Synthesis and Characterization of Different Transition Metal-Alginate Based Heterogeneous Catalyst for Esterification Reaction

2016 ◽  
Vol 709 ◽  
pp. 57-60
Author(s):  
Fei Ling Pua ◽  
Kah Thong Looi ◽  
Shamala Gowri Krishnan ◽  
Sharifah Nabihah
Keyword(s):  
Fatty Acids ◽  
Oleic Acid ◽  
Transition Metal ◽  
Free Fatty Acids ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Biodiesel Production ◽  
Esterification Reaction ◽  
Homogeneous Catalyst

In recent years, attention has been drawn to produce heterogeneous catalyst to replace homogeneous catalyst in biodiesel industry. This study was focused on the synthesis of three different types of alginate based heterogeneous catalyst (Ferric-alginate, Copper-alginate, and Nickel alginate) and the effect of the catalyst on esterification of oleic acid. Morphology and elemental analysis was conducted to investigate the properties of the catalyst. The new heterogeneous catalysts were used to catalyze the esterification of oleic acid at reaction temperature of 60°C and 2 hours reaction time. Fe-alginate has achieved the highest free fatty acids (FFAs) conversation rate of 82.03%. The results and findings proved that transition metal-alginate heterogeneous catalyst has the potential and ability to esterify the free fatty acids prior biodiesel production from high free fatty acids feedstock.

Evaluation of Catalyst Ni0.4Cu0.1Zn0.5Fe2O4 on Methyl Esterification of Free Fatty Acid Present in Cottonseed Oil

2012 ◽  
Vol 727-728 ◽  
pp. 1302-1307 ◽  
Author(s):  
Joelda Dantas ◽  
A.S. Silva ◽  
P.T.A. Santos ◽  
J.R.D. Santos ◽  
D.C. Barbosa ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Single Phase ◽  
Spinel Phase ◽  
Cottonseed Oil ◽  
Acid Sites ◽  
Molar Ratio ◽  
Solid Catalyst ◽  
Esterification Reaction ◽  
Methyl Esterification ◽  
Molar Ratios

This study aimed to assess the performance of the solid catalyst Ni0.4Cu0.1Zn0.5Fe2O4, synthesized by combustion reaction, over the methyl esterification reaction of the fatty acids present in cottonseed oil. The catalyst was characterized by XRD, FTIR pyridine absorption, Raman spectroscopy, and SEM. The reactions were conducted at 140 and 180°C with molar ratios of 1:3, 1:6 and 1:9, with 2% of catalyst and reaction time of 2 h. The XRD results showed that the single phase ferrite was obtained with surface area of 87 m2/g and with mesoporous characteristic. It was observed from the FTIR pyridine absorption only the presence of Lewis acid sites. The Raman spectra confirm the presence of the inverse spinel phase. The results indicated that at 180°C and molar ratio of 1:9, the conversion of free fatty acids was about 87%.

scholarly journals Natural and Modified Montmorillonite Clays as Catalysts for Synthesis of Biolubricants

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1764 ◽  
Author(s):  
Francisco Luna ◽  
Juan Cecilia ◽  
Rosana Saboya ◽  
Deicy Barrera ◽  
Karim Sapag ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Reaction Medium ◽  
Textural Properties ◽  
Esterification Reaction ◽  
Water Removal ◽  
Modified Clays ◽  
Modified Montmorillonite ◽  
Montmorillonite Clays ◽  
Equilibrium Conversion ◽  
Reaction Equilibrium

In this study, natural and modified clays were evaluated as catalysts in an esterification reaction to obtain bio-based lubricants. The biolubricants are environmentally preferred to petroleum-based lubricants because they are biodegradable and non-toxic. Other advantages include very low volatility due to the high molecular weight and excellent viscosity properties with temperature variations. Modifications in natural clay were performed intending to obtain materials with different textural properties that could improve the reaction under study. The modified clays were obtained in two ways: by pillarization using Al13 Keggin polyoxocations or by acid treatments with H2SO4, HCl and HNO3. All samples were evaluated for the esterification reaction of fatty acids from castor oil (FACO) using 2-ethyl-hexanol. During the reaction step, a zeolite-based adsorbent was used for water removal to increase the reaction equilibrium conversion. Gas chromatography and nuclear magnetic resonance were performed to ensure the formation of the products. The highest conversion of fatty acids to esters was obtained using pillared clays. Adding adsorbent in the reaction medium (10 g of 3A zeolite to 100 g of FACO), the conversion improved from 74–88 wt % after 6 h at 50 °C.

scholarly journals Chemocatalytic Conversion of Cellulose into Key Platform Chemicals

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Guangbi Li ◽  
Wei Liu ◽  
Chenliang Ye ◽  
Xiaoyun Li ◽  
Chuan-Ling Si
Keyword(s):  
Heterogeneous Catalysis ◽  
Lignocellulosic Biomass ◽  
Heterogeneous Catalysts ◽  
Value Added ◽  
Direct Conversion ◽  
Reaction Conditions ◽  
Platform Chemicals ◽  
Stable Chemical ◽  
Wide Range ◽  
Sustainable Societies

Chemocatalytic transformation of lignocellulosic biomass to value-added chemicals has attracted global interest in order to build up sustainable societies. Cellulose, the first most abundant constituent of lignocellulosic biomass, has received extensive attention for its comprehensive utilization of resource, such as its catalytic conversion into high value-added chemicals and fuels (e.g., HMF, DMF, and isosorbide). However, the low reactivity of cellulose has prevented its use in chemical industry due to stable chemical structure and poor solubility in common solvents over the cellulose. Recently, homogeneous or heterogeneous catalysis for the conversion of cellulose has been expected to overcome this issue, because various types of pretreatment and homogeneous or heterogeneous catalysts can be designed and applied in a wide range of reaction conditions. In this review, we show the present situation and perspective of homogeneous or heterogeneous catalysis for the direct conversion of cellulose into useful platform chemicals.

scholarly journals Controlling as a tool for SME management with an emphasis on innovations in the context of Industry 4.0

Equilibrium ◽  
2019 ◽  
Vol 14 (4) ◽  
pp. 763-785 ◽  
Author(s):  
Premysl Pisar ◽  
Diana Bilkova
Keyword(s):  
Statistical Analysis ◽  
Management System ◽  
Financial Stability ◽  
Industry 4.0 ◽  
New Technologies ◽  
Experimental Testing ◽  
Pearson Correlation ◽  
Value Added ◽  
Wide Range ◽  
Depth Analysis

Research background: Small and medium-sized businesses are significant economic power and employer in the European Union. The modern globalized world, new technologies, and advanced connectivity bring SMEs a wide range of opportunities, but also threats. Increasing the stability and competitiveness of SMEs is one of the main goals of national governments and the EU. The research is based on personal research in SMEs, its experiences and backward testing of reached results. Purpose of the article: The aim of the paper is to analyze the possibilities the potential of using controlling as a managing tool of SMEs for increased competitiveness in the context of Industry 4.0  with an emphasis on innovations. Methods: The study is based on a detailed analysis of 341 SMEs from the Czech Republic obtained in the years 2017–2019. The data were analyzed using statistical methods such Pearson correlation, stepwise regression for the purpose of determining the relationship between the controlling management system of a company, its innovation potential, level of process maturity, number of employees, internal audit, financial stability and strategic plan. Statistical analysis confirmed the close relationship of the analyzed variables and backwards experimental testing of the statistical analysis conclusions defined critical factors in the area of people in an organization, usage of advanced information systems and Industry 4.0 technologies implementation. Findings & Value added: Those important areas were determined as essential for the successful development of SMEs, as well as the most significant threats in the Industry 4.0 environment. The information obtained is useful in practice and can be applied to a more in-depth analysis of the issues.  The research findings are showing possible opportunities and treads for SMEs long term stability and development as well as ways to increase enterprise performance based on controlling management system.

scholarly journals Effect of Type of Metals on Site Selective Dehydrogenation of Stearic Acid

2021 ◽  
Vol 333 ◽  
pp. 05001
Author(s):  
Chayakorn Karasuta ◽  
Supakorn Sirimittagoon ◽  
Ratchanon Chantanuson ◽  
Varong Pavarajarn
Keyword(s):  
Fatty Acids ◽  
Double Bond ◽  
Stearic Acid ◽  
Heterogeneous Catalysts ◽  
Raw Materials ◽  
Short Chain Fatty Acids ◽  
Inert Atmosphere ◽  
Aliphatic Chain ◽  
Wide Range ◽  
Chain Fatty Acids

Short-chain fatty acids (SCFAs) have been used as raw materials in wide range of chemical and medical applications. One technique to produce SCFAs is oxidative cleavage of long-chain fatty acids (LCFAs). However, unless the LCFAs are unsaturated, the yield of SCFAs is often very low because the carboxylic group of the fatty acid is more active than other part of the molecule. This work explores the idea of introducing a double bond into saturated LCFA, i.e., stearic acid, via selective dehydrogenation using commercial heterogeneous catalysts. However, cracking of the LCFA is also catalysed. Different type of metals was therefore investigated to study the effect of metals on the cracking and dehydrogenation. The experiments were conducted in an autoclave reactor under inert atmosphere. The temperature was in the range of 250–350°C. The products were analysed by gas chromatography equipped with mass spectroscopy (GC/MS). The results reveal that the introduction of double bond in the aliphatic chain of the stearic acid is possible although the yields of the unsaturated LCFAs are low. Effects of various parameters, such as temperature, pressure, and reaction time, were also investigated and reported.

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