scholarly journals USE OF BEEF TALLOW AS AN ALTERNATIVE FOR CONSOLIDATION OF BIODIESEL PRODUCTION IN BRAZILIAN STATE OF TOCANTINS: A STUDY OF OXIDATIVE STABILITY VIA SPECTROSCOPY ANALYSIS IN THE UV-VIS

2015 ◽  
Vol 12 (23) ◽  
pp. 90-99
Author(s):  
Carolina Porto PRADO ◽  
Kytéria Sabina Lopes DE FIGUEREDO ◽  
Igor Hernandes Santos RIBEIRO
Keyword(s):  
Beef Tallow ◽  
Alternative Fuels ◽  
Spectroscopic Analysis ◽  
Early Stage ◽  
Oxidation Stability ◽  
Biodiesel Production ◽  
Spectroscopy Analysis ◽  
National Agency ◽  
Production Chain ◽  
The City

Brazil has emerged as producer of alternative fuels derived from biomass, such as biodiesel, which can replace fossil diesel and is less polluting. However, there is a concentration of income in the production chain, since most of the biodiesel produced in the world is derived from soy oil from major producers. This scenario also corresponds to Brazil, and Tocantins state could not frame in the National Program for Biodiesel Production. In this study, the biodiesel was produced from beef tallow obtained from slaughterhouses in the city of Gurupi-TO. The beef tallow was characterized in its raw state, processed and then the biodiesel was synthesized. We studied the oxidation stability through spectroscopic analysis in the UV-vis, and we observed their stability to oxidation via spectroscopic analysis in the UV-vis, and observed that the beef tallow biodiesel showed increased absorption in 234 nm and 268 nm after reduction in oxidative stress. We checked an early stage of oxidation after the seventh day with the maximum concentration of primary oxidation compounds. We obtained a satisfactory biodiesel within some of the parameters of the National Agency of Petroleum, Gas Naturale Biofuels (ANP).

scholarly journals Continuous Valorization of Glycerol into Solketal: Recent Advances on Catalysts, Processes, and Industrial Perspectives

2021 ◽  
Vol 2 (2) ◽  
pp. 286-324
Author(s):  
Isabella Corrêa ◽  
Rui P. V. Faria ◽  
Alírio E. Rodrigues
Keyword(s):  
Continuous Production ◽  
Oxidation Stability ◽  
Raw Material ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Fuel Additive ◽  
Production Chain ◽  
Operational Conditions ◽  
Production Processes ◽  
Recent Advances

With the global biodiesel production growing as never seen before, encouraged by government policies, fiscal incentives, and emissions laws to control air pollution, there has been the collateral effect of generating massive amounts of crude glycerol, a by-product from the biodiesel industry. The positive effect of minimizing CO2 emissions using biofuels is jeopardized by the fact that the waste generated by this industry represents an enormous environmental disadvantage. The strategy of viewing “waste as a resource” led the scientific community to propose numerous processes that use glycerol as raw material. Solketal, the product of the reaction of glycerol and acetone, stands out as a promising fuel additive capable of enhancing fuel octane number and oxidation stability, diminishing particle emissions and gum formation, and enhancing properties at low temperatures. The production of this chemical can rely on several of the Green Chemistry principles, besides fitting the Circular Economy Model, once it can be reinserted in the biofuel production chain. This paper reviews the recent advances in solketal production, focusing on continuous production processes and on Process Intensification strategies. The performance of different catalysts under various operational conditions is summarized and the proposed industrial solketal production processes are compared.

Influence of Synthetic and Natural Antioxidants on the Oxidation Stability of Beef Tallow Before Biodiesel Production

2017 ◽  
Vol 10 (4) ◽  
pp. 797-803 ◽  
Author(s):  
Maurício N. Kleinberg ◽  
Maria A. S. Rios ◽  
Hugo L. B. Buarque ◽  
Marcelo M. V. Parente ◽  
Célio L. Cavalcante ◽  
...  
Keyword(s):  
Beef Tallow ◽  
Oxidation Stability ◽  
Natural Antioxidants ◽  
Biodiesel Production

An Overview of Metal-organic Frameworks-based Acid/Base Catalysts for Biofuel Synthesis

2020 ◽  
Vol 24 (16) ◽  
pp. 1876-1891
Author(s):  
Qiuyun Zhang ◽  
Yutao Zhang ◽  
Jingsong Cheng ◽  
Hu Li ◽  
Peihua Ma
Keyword(s):  
Alternative Fuels ◽  
Heterogeneous Catalysts ◽  
Supported Catalysts ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Flexible Structures ◽  
Biodiesel Production ◽  
Biodiesel Synthesis ◽  
Metal Organic ◽  
Organic Framework

Biofuel synthesis is of great significance for producing alternative fuels. Among the developed catalytic materials, the metal-organic framework-based hybrids used as acidic, basic, or supported catalysts play major roles in the biodiesel production. This paper presents a timely and comprehensive review of recent developments on the design and preparation of metal-organic frameworks-based catalysts used for biodiesel synthesis from various oil feedstocks, including MILs-based catalysts, ZIFs-based catalysts, UiO-based catalysts, Cu-BTC-based catalysts, and MOFs-derived porous catalysts. Due to their unique and flexible structures, excellent thermal and hydrothermal stability, and tunable host-guest interactions, as compared with other heterogeneous catalysts, metal-organic framework-based catalysts have good opportunities for application in the production of biodiesel at industrial scale.

scholarly journals Does seeing a psychologist reduce sickness absence due to mental disorders? A quasi-experiment

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
J Lahti ◽  
J Harkko ◽  
H Sumanen ◽  
K Piha ◽  
O Pietiläinen ◽  
...  
Keyword(s):  
Mental Disorders ◽  
Sickness Absence ◽  
Work Ability ◽  
Early Stage ◽  
Matched Sample ◽  
Full Sample ◽  
Common Support ◽  
The City ◽  
Quasi Experiment

Abstract Background Mental ill-health in young adults is a major public health and work-life problem. We examined in a quasi-experimental design whether occupational psychologist appointment can reduce subsequent sickness absence due to mental disorders among young Finnish employees. Methods The present study was conducted among 18-39-year-old employees of the City of Helsinki using register data from the City of Helsinki and the Social lnsurance Institution of Finland. We used Wald test to compare the differences in sickness absence days due to mental disorders (ICD-10, F-diagnosed) between those treated (occupational psychologist appointment for work ability support) and the non-treated (no psychologist appointment) during a one year follow-up. The full sample (n = 2156, 84% women) consisted of employees with mental disorder diagnosed sickness absence during 2009-2014. To account for the systematic differences between the treated and non-treated, the participants were matched according to their characteristics (age, sex, occupational class, education, previous sickness absence and psychotropic medication). The matched sample included 886 participants. We excluded those with treatment before the treatment screening time (± 3 months to the end of sickness absence period), non-treated with treatment during the follow-up and those that could not be matched (lack of common support). Results In the full sample, the mean of sickness absence days due to mental disorders was 17.7 (95% CI, 11.4, 24.1) days for those treated (n = 240) and 23.2 (95% CI, 20.5, 25.9) days for non-treated (n = 1916), difference being non-significant. The corresponding figures in the matched sample were (16.8, 95% CI, 9.5-24.1) for those treated (n = 195) and (27.8, 95% CI, 22.6-32.9) for non-treated (n = 691), difference being statistically significant (p = 0.02). Conclusions This quasi-experiment suggests that seeing an occupational psychologist to support work ability may be reduce mental health related sickness absence. Key messages We showed that supporting work ability at an early stage may prevent sickness absence due to mental disorders. More efforts to provide early stage support for maintaining work ability may prove useful in reducing sickness absence rates in younger employees.

scholarly journals A Comprehensive Review on Oil Extraction and Biodiesel Production Technologies

2021 ◽  
Vol 13 (2) ◽  
pp. 788
Author(s):  
Zulqarnain ◽  
Muhammad Ayoub ◽  
Mohd Hizami Mohd Yusoff ◽  
Muhammad Hamza Nazir ◽  
Imtisal Zahid ◽  
...  
Keyword(s):  
Energy Demand ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Significant Proportion ◽  
Waste Cooking Oil ◽  
Oil Extraction ◽  
Biodiesel Production ◽  
Waste Oils ◽  
Biodiesel Synthesis ◽  
Production Technologies

Dependence on fossil fuels for meeting the growing energy demand is damaging the world’s environment. There is a dire need to look for alternative fuels that are less potent to greenhouse gas emissions. Biofuels offer several advantages with less harmful effects on the environment. Biodiesel is synthesized from the organic wastes produced extensively like edible, non-edible, microbial, and waste oils. This study reviews the feasibility of the state-of-the-art feedstocks for sustainable biodiesel synthesis such as availability, and capacity to cover a significant proportion of fossil fuels. Biodiesel synthesized from oil crops, vegetable oils, and animal fats are the potential renewable carbon-neutral substitute to petroleum fuels. This study concludes that waste oils with higher oil content including waste cooking oil, waste palm oil, and algal oil are the most favorable feedstocks. The comparison of biodiesel production and parametric analysis is done critically, which is necessary to come up with the most appropriate feedstock for biodiesel synthesis. Since the critical comparison of feedstocks along with oil extraction and biodiesel production technologies has never been done before, this will help to direct future researchers to use more sustainable feedstocks for biodiesel synthesis. This study concluded that the use of third-generation feedstocks (wastes) is the most appropriate way for sustainable biodiesel production. The use of innovative costless oil extraction technologies including supercritical and microwave-assisted transesterification method is recommended for oil extraction.

scholarly journals Enzymatic Transesterification of Waste Frying Oil from Local Restaurants in East Colombia Using a Combined Lipase System

2020 ◽  
Vol 10 (10) ◽  
pp. 3566
Author(s):  
Mary Angélica Ferreira Vela ◽  
Juan C. Acevedo-Páez ◽  
Nestor Urbina-Suárez ◽  
Yeily Adriana Rangel Basto ◽  
Ángel Darío González-Delgado
Keyword(s):  
Reaction Time ◽  
Methyl Esters ◽  
Enzyme Concentration ◽  
Operating Conditions ◽  
Frying Oil ◽  
Biodiesel Production ◽  
Optimum Operating ◽  
Waste Frying Oil ◽  
Production Chain ◽  
Enzymatic Transesterification

The search for innovation and biotechnological strategies in the biodiesel production chain have become a topic of interest for scientific community owing the importance of renewable energy sources. This work aimed to implement an enzymatic transesterification process to obtain biodiesel from waste frying oil (WFO). The transesterification was performed by varying reaction times (8 h, 12 h and 16 h), enzyme concentrations of lipase XX 25 split (14%, 16% and 18%), pH of reaction media (6, 7 and 8) and reaction temperature (35, 38 and 40 °C) with a fixed alcohol–oil molar ratio of 3:1. The optimum operating conditions were selected to quantify the amount of fatty acid methyl esters (FAMEs) generated. The highest biodiesel production was reached with an enzyme concentration of 14%, reaction time of 8 h, pH of 7 and temperature of 38 °C. It was estimated a FAMEs production of 42.86% for the selected experiment; however, best physicochemical characteristics of biodiesel were achieved with an enzyme concentration of 16% and reaction time of 8 h. Results suggested that enzymatic transesterification process was favorable because the amount of methyl esters obtained was similar to the content of fatty acids in the WFO.

scholarly journals Sustainable development in the city of Heidelberg

2015 ◽  
Vol 2 (313) ◽  
Author(s):  
Alicja Małgorzata Graczyk
Keyword(s):  
Sustainable Development ◽  
Early Stage ◽  
Renewable Energy Sources ◽  
Local Level ◽  
Local Heat ◽  
The Sustainable Development ◽  
Ecological Awareness ◽  
Development Goals ◽  
High Level ◽  
The City

The city of Heidelberg has won twice the price of European Sustainable City Award. The paper presents the latest author’s investigation (July 2014) about the sustainable development in the Heidelberg. The aim of the article is an analyses and assessment of the implementation of sustainable development in the city. The policy and economical instruments implemented at the local level at the very early stage (early 90s) help the city to build ecological education and shape ecological style of life.. The city citizens have a very high level of ecological awareness and very often participate in policy decisions, shaping sustainable development goals of the Heidelberg. The main local priorities for sustainable development are: climate and environment protection, rising energy efficiency by using renewable energy sources, local heat district, ecological transport and building in passive standard.

scholarly journals Recent Advances in Non‐nucleophilic Mg Electrolytes

2021 ◽  
Vol 7 ◽  
Author(s):  
Qijie Wu ◽  
Kewei Shu ◽  
Lili Sun ◽  
Haihua Wang
Keyword(s):  
High Performance ◽  
Early Stage ◽  
Oxidation Stability ◽  
Short Review ◽  
High Reactivity ◽  
Inherent Safety ◽  
Practical Application ◽  
Safety Issues ◽  
Ion Structure ◽  
Recent Advances

High-performance electrolyte is still a roadblock for the development of rechargeable magnesium (Mg) batteries. Grignard-type electrolytes were once the only choice in the early stage of rechargeable Mg batteries research. However, due to their nucleophilic nature and high reactivity, Grignard-type electrolytes have inherent safety issues and low oxidation stability, which restrict the development of rechargeable Mg batteries in terms of practical application. Recently, emerging novel Mg battery systems such as Mg-S, Mg-O2/air batteries also require non‐nucleophilic electrolytes with high oxidation stability. This short review summarizes recent advances in non‐nucleophilic Mg electrolytes and aims to provide insights into electrochemical properties and active Mg ion structure of such electrolytes.

Supporting school leavers in areas of deprivation into initial positive leaver destinations

2013 ◽  
Vol 16 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Stephen McKinney ◽  
Stuart Hall ◽  
Kevin Lowden ◽  
Michele McClung ◽  
Lauren Cameron
Keyword(s):  
Young People ◽  
Distributed Leadership ◽  
Early Stage ◽  
Child Poverty ◽  
Small Scale ◽  
School Leaver ◽  
The United Kingdom ◽  
The City ◽  
Detrimental Impact

The contemporary attempts to tackle poverty and child poverty in the United Kingdom have been seriously hindered by the effects of the economic crisis (Hirsch, 2008a; Mooney, 2011). The prevailing discourses of the recession and intergenerational poverty can lead to a view that the effects of child poverty and the consequent detrimental impact on school education and future prospects for some young people are intractable (Sinclair & McKendrick, 2009). There can be insufficient emphasis on the successful attempts, however fragile, to intervene in the cycle of deprivation. This article reports on research conducted in two contrasting groups of secondary schools in the city of Glasgow, located in areas of deprivation, as they work to secure initial positive school leaver destinations for young people. This small-scale case study highlights the importance of a strong leadership vision committed to initial positive school leaver destinations, but complemented by distributed leadership and support from external partners to enable sustained successes. It also highlights the importance of individual attention to all young people to support and motivate them and the effectiveness of intervention at an early stage.

Production of Biodiesel from Desert Date Seed Oil Using Heterogeneous Catalysts

2021 ◽  
Vol 53 ◽  
pp. 180-189
Author(s):  
Saidat Olanipekun Giwa ◽  
Maku Barbanas Haggai ◽  
Abdulwahab Giwa
Keyword(s):  
Reaction Time ◽  
Alternative Fuels ◽  
Heterogeneous Catalysts ◽  
Raw Materials ◽  
Biodiesel Production ◽  
Local Market ◽  
Flat Bottom ◽  
Optimum Yield ◽  
Animal Fats ◽  
Date Seed

In the recent time, there is increasing research in the area of alternative fuels as the exhausts of presently used petroleum-based fuels have been identified to have negative effects on the environment. Fuels produced from plant oils and animal fats have the tendencies of replacing petro fuels since they are renewable in nature. One of these renewable fuels is biodiesel. However, the homogenous catalyst used in biodiesel production has some drawbacks such as difficulty in separation from the fuel, soap formation and corrosiveness of the product mixture. In this work, the use of heterogeneous catalyst sourced from local raw materials (kaolin and eggshell) for the production of biodiesel from oil of desert date seed has been investigated. The kaolin obtained from Alkaleri Mining Site, Bauchi, was calcined in an oven at 800 °C for 3 h. The calcined kaolin was then chemically activated. Also, the eggshell-based catalyst was produced from raw eggshells after washing, drying, grinding, sieving using 0.3 mm sieve size and calcining at 900 °C for 3 h. Furthermore, the oil content of the desert date seed, which was acquired from a local market in Bauchi, was extracted via solvent extraction in a laboratory with a yield of 42%. Then, the biodiesel was subsequently prepared by mixing the oil, methanol and catalyst in a flat bottom flask and heating the mixture for a specified period. The catalyst concentration, methanol to oil ratio and time of reaction were subsequently varied to obtain the best yield. The results obtained revealed that an optimum yield of 29% could be obtained at methanol to oil ratio of 6:1 and a reaction time of 60 min using 1.5 g of eggshell-based catalyst while an optimum yield of 22% was obtained with 0.6 g for kaolin-based catalyst at a reaction time of 60 min and methanol to oil ratio of 4:1. It is recommended that further work should be carried out to improve on the yield of the biodiesel obtained using the heterogeneous catalysts.

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