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Antioxidant Additive

The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

M. Cheralathan – 1st expert on this subject based on the ideXlab platform

  • EXPERIMENTAL INVESTIGATION TO MITIGATE EXHAUST EMISSIONS IN A SINGLE CYLINDER CI ENGINE FUELLED WITH METHYL ESTER OF NEEM OIL USING TOCOPHEROL ACETATE
    , 2020
    Co-Authors: M. Cheralathan

    Abstract:

    Biodiesel offers cleaner combustion over conventional diesel fuel including reduced particulate matter, carbon monoxide and unburned hydrocarbon emissions. However, several studies reported slight increase in NOx emissions (about 13%) for biodiesel fuel compared with conventional diesel fuel. Use of Antioxidant Additives is one of the most cost-effective ways to reduce the formation of NOx. In this study, the effect of Antioxidant Additive (-Tocopherol Acetate) on NOx emissions in a neem methyl ester fuelled direct injection diesel engine has been investigated experimentally. The Antioxidant Additive is mixed in various proportions with neem methyl ester and was tested in computerized 4-stroke water-cooled single cylinder diesel engine of 3.5 kW rated power. Results show that the Antioxidant Additive is effective in controlling the emissions like NOx, HC and Smoke intensity of neem biodiesel fuelled diesel engines. Particularly for MENO200T mixture, NOx emissions reduce by 22.41 % at full load conditions due to the delay or inhibitions of oxidative process by donating an electron or hydrogen atom to a radical derivative.

  • The effect of Antioxidant Additives with methyl ester of neem oil on the oxidation stability
    Energy Sources Part A-recovery Utilization and Environmental Effects, 2016
    Co-Authors: G. Balaji, M. Cheralathan

    Abstract:

    ABSTRACTBiodiesel as an alternative to diesel fuel prepared from vegetable oils or animal fats has attracted more and more attention because of its renewability and environment-friendly nature. But biodiesel undergoes oxidation and degenerates more quickly than mineral diesel. This problem needs to be addressed to increase the biodiesel usage. In this paper, the experimental investigation on the effect of Antioxidant Additives on the oxidation stability of a methyl ester of neem oil (MENO) was reported. The Antioxidant Additive is mixed in various proportions (100–400 ppm) with MENO. The oxidation stability was tested in the Rancimat apparatus. Results show that the Antioxidant Additive is effective in increasing the oxidation stability of MENO.

  • Experimental investigation to reduce exhaust emissions in a single cylinder CI engine fuelled with methyl ester of neem oil using Antioxidant (L-ascorbic acid)
    Biofuels, 2016
    Co-Authors: G. Balaji, M. Cheralathan

    Abstract:

    ABSTRACTBiodiesel offers cleaner combustion over conventional diesel fuel, including reduced particulate matter, carbon monoxide and unburned hydrocarbon emissions. However, several studies point to a slight increase in NOx emissions (about 13%) for biodiesel fuel compared with conventional diesel fuel. The use of Antioxidant Additives is one of the most cost-effective ways to reduce the formation of NOx. In this study, the effect of Antioxidant Additive (L-ascorbic acid) on NOx emissions in a neem methyl ester fuelled direct injection diesel engine has been investigated experimentally. The Antioxidant Additive is mixed in various proportions with neem methyl ester and was tested in computerized four-stroke, water-cooled single cylinder diesel engine of 3.5 kW rated power. Results show that the Antioxidant Additive is effective in controlling the emissions like NOx, HC and CO2 of neem biodiesel fuelled diesel engines. Particularly for LA300 mixture, NOx emissions reduce by 16.95% at full load conditions d…

J L Sanchez – 2nd expert on this subject based on the ideXlab platform

  • renewable Antioxidant Additive for biodiesel obtained from black liquor
    Fuel, 2019
    Co-Authors: Jeanmichel Lavoie, Noemi Gillalaguna, Alberto Gonzalo, Thierry Ghislain, Emmanuelle Bahl, J Arauzo, J L Sanchez

    Abstract:

    Abstract Black liquor obtained from semichemical pulping of barley straw was depolymerized in a stirred autoclave reactor, at temperature in the range of 250–300 °C while varying the amount of catalyst (zeolite Y). Three fractions were obtained from the depolymerized liquor: a fraction directly extracted from the liquid with isopropyl acetate (Lα), a second one which contains the heaviest compounds precipitated from the liquid at pH 1 (Lβ) and a third one obtained by extraction of the acidified liquid (Lγ). The three fractions were tested as Antioxidant Additives for biodiesel, blending them individually at a dosage of 1 wt%. The Antioxidant activity was Lα > Lγ > Lβ. The Lα fraction showed the highest Antioxidant activity, increasing the oxidation stability time over neat biodiesel from 150 to 250%. The phenolic volatile content of the fractions (measured by GC/MS) decreased in the same rank (Lα > Lγ > Lβ), so there doesn’t seem to be correlation between the volatile content and the increase of Antioxidant activity. Depolymerizarion temperature was the most influential parameter, showing a clear positive effect on the Antioxidant activity for the three fractions.

  • performance and emissions of a diesel engine using sunflower biodiesel with a renewable Antioxidant Additive from bio oil
    Fuel, 2018
    Co-Authors: Cristina Dueso, M Munoz, F Moreno, J Arroyo, Noemi Gillalaguna, Ana Bautista, Alberto Gonzalo, J L Sanchez

    Abstract:

    Abstract The aim of this study is to test the behaviour of sunflower biodiesel in a diesel engine after being treated with a natural Antioxidant Additive produced from bio-oil extraction (final dosage of bio-oil compounds in doped biodiesel of 1.9 wt%). The influence of this renewable Additive in both the engine performance and the produced emissions was evaluated. Five more fuels were used for the sake of comparison: petroleum diesel, neat sunflower biodiesel without Additives, commercial biodiesel, commercial B10 blend and another B10 blend prepared from petro-diesel and doped sunflower biodiesel. Brake power was found to be similar for the six fuels, while the brake specific fuel consumption and the brake thermal efficiency were higher for biodiesel fuels. Only slight differences (

Ying Dong – 3rd expert on this subject based on the ideXlab platform

  • Ultrasound-assisted lipase-catalyzed synthesis of D-isoascorbyl palmitate: Process optimization and Kinetic evaluation
    Chemistry Central Journal, 2013
    Co-Authors: Feng Jie Cui, Hong-xia Zhao, Wen-jing Sun, Zhuan Wei, Si Lian Yu, Qiang Zhou, Ying Dong

    Abstract:

    BACKGROUND: D-isoascorbic acid is a food Antioxidant Additive and used in accordance with Good Manufacturing Practice (GMP). High solubility in water (about 150 g/L at 25°C) reduces its effectiveness in stabilizing fats and oils. Our research group had successfully synthesized D-isoascorbyl palmitate using immobilized lipase Novozym 435 as a biocatalyst. Low production efficiency of D-isoascorbyl palmitate is still a problem for industrial production due to the long reaction time of over 24 h. In the present work, ultrasonic treatment was applied for accelerating the reaction process. The operation parameters were optimized to obtain the maximum D-isoascorbyl palmitate conversion rate by using a 5-level-4-factor Central Composite Design (CCD) and Response Surface Methdology (RSM). The reaction apparent kinetic parameters under the ultrasound treatment and mechanical shaking conditions were also determined and compared.\n\nRESULTS: Results showed that ultrasound treatment decreased the reaction time by over 50%. D-isoascorbyl palmitate yielded to 94.32 ± 0.17% and the productivity reached to 8.67 g L-1 h-1 under the optimized conditions as: 9% of enzyme load (w/w), 61°C of reaction temperature, 1:5 of D- isoascorbic-to-palmitic acid molar ratio, and 137 W of the ultrasound power. The immobilized lipase Novozym 435 could be reused for 7 times with 65% of the remained D-isoascorbyl palmitate conversion rate. The reaction kinetics showed that the maximum apparent reaction rate (vmax) of the ultrasound-assisted reaction was 2.85 times higher than that of the mechanical shaking, which proved that ultrasound treatment significantly enhanced the reaction efficiency.\n\nCONCLUSION: A systematic study on ultrasound-assisted enzymatic esterification for D-isoascorbyl palmitate production is reported. The results show a promising perspective of the ultrasound technique to reduce the reaction time and improve the production efficiency. The commercial D-isoascorbyl palmitate synthesis will be potentially realized due to this ultrasound-promoted esters synthesis method.