Microwave-assisted pyrolysis of methyl ricinoleate for continuous production of undecylenic acid methyl ester (UAME)

Nie, Yong; Duan, Ying; Gong, Ruchao; Yu, Shangzhi; Lu, Meizhen; Yu, Fei; Ji, Jianbing

doi:10.1016/j.biortech.2015.03.076

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…Undecylenic acid (or 10‐undecenoic acid, UA) is a fatty acid obtained from the pyrolysis of ricinoleic acid, the main fatty acid of castor oil (Nie et al, ). Castor oil is a nonedible oil that presents a high oxidative stability and a low temperature stability, but due to the hydroxyl group of ricinoleic acid, it contains a relatively high water content and viscosity (Mutlu and Meier, ; Scholz and da Silva, ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel Polyol Esters of Undecylenic Acid As Ecofriendly Lubricants

Cavalcante

Rocha

Brito

et al. 2018

J Americ Oil Chem Soc

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Three novel esters of undecylenic acid (UA) were synthesized using the following polyols: linear diglycerol (DG), pentaerythritol monomethylether (PEME), and trimethyloltoluene (TMT). They were characterized through density, viscosity, thermo-oxidative stability, melting point (m.p.), miscibility with mineral oils, and toxicity to evaluate their potential as ecofriendly lubricants. Trimethylolpropane (TMP) triundecylenate was also synthesized and characterized as a reference ester. Esters' densities were in the range 0.93-0.97 g cm −3 . The PEME ester showed a kinematic viscosity of 25.2 cSt at 40 C, only slightly higher than that of TMP ester (24.7 cSt), both of them near the ISO VG 22 class, while DG and TMT esters were near the ISO VG 32 class, with viscosities of 28.3 and 37.1 cSt, respectively. PEME and TMT esters were similar in thermo-oxidative stability and more stable than their corresponding oleate esters. The m.p. of TMT ester was remarkedly low (−54 C), showing its potential for very cold temperature applications. TMT ester was found to be nontoxic against Artemia salina (LC 50 > 1000 μg mL −1 ), an initial indication of nontoxicity of UA esters in aquatic media. The synthesized esters showed potential to be applied as ecofriendly lubricants.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel Polyol Esters of Undecylenic Acid As Ecofriendly Lubricants

Cavalcante

Rocha

Brito

et al. 2018

J Americ Oil Chem Soc

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“…The measurement of density, viscosity, and vapor pressure of methyl ricinoleate is necessary to predict biodiesel properties. In addition, castor oil is the only vegetable oil containing hydroxy in nature, methyl ricinoleate is also an important chemical intermediate for the bioproduction of perfumes, drugs, polymers, and other fine chemicals. − Therefore, the preparation, purification, storage, and transportation of chemical raw materials also need the properties of methyl ricinoleate. Knothe et al − have measured the viscosity of pure methyl ricinoleate at low temperatures from (−10 to 40) °C.…”

Section: Introductionmentioning

confidence: 99%

Measurements and Correlations of Density, Viscosity, and Vapor Pressure for Methyl Ricinoleate

et al. 2016

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The density and viscosity of methyl ricinoleate were measured in the temperature range from (293.16 to 383.23) K and (298.23 to 358.15) K, respectively. The vapor pressure of methyl ricinoleate was determined using a static method in the temperature range of (451.58 to 476.80) K at the pressure between (232 and 868) Pa, and methyl palmitate was employed to examine the reliability of the experimental apparatus. The experimental data were compared with the open data for methyl ricinoleate and other fatty acid methyl esters with similar molecular weight. Temperature-dependence correlation equations for the density, viscosity, and vapor pressure were proposed.

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“…Pyrolysis is a kind of fast reaction for the production of fine chemicals. The fine chemicals undecylenic acid methyl ester and heptanal can be produced by the pyrolysis of methyl ricinoleate at high temperature [1,2]. The reaction temperature and heating rate of feedstock were the main influencing factors for pyrolysis [2].…”

Section: Introductionmentioning

confidence: 99%

“…Fast and uniform heating of feedstock could be achieved through spray heat transfer between the atomized feedstock and surface of SiC bed heated by microwave. Our group developed a microwave-assisted heating system coupled with atomization feeding for methyl ricinoleate pyrolysis, obtaining higher selectivities and yields of target products [1,2,11]. In the atomization feeding process, methyl ricinoleate was broken to small droplets by a atomization nozzle.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in a novel microwave heating device coupled with atomization feeding

Xie

Mao

et al. 2022

THERM SCI

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The heat transfer characteristics of the microwave heating coupled with atomization feeding were investigated using ethanol as the spray medium on a pressure swirl nozzle. The effects of spray height, flow rate and temperature on the sauter mean diameter (SMD) of atomized droplets were examined. The results showed that the droplet SMD was 12-130 ?m, which increased with the spray height and decreased with the flow rate and temperature of spray medium. Through the fitting of the experimental data, the dimensionless correlation of the droplet SMD which was based on orifice diameter, Reynolds and Ohnesorge numbers was obtained. The calculated results were basically consistent with the experimental data within 15% error. The heat transfer characteristics of atomized droplets on high-temperature surface of SiC bed heated by microwave were then investigated. The effects of spray flow rate, spray height and spray temperature on the heat transfer characteristics were examined. The power of spray heat transfer decreased with the temperature and increased with the spray flow rate and spray height. The dimensionless correlation to describe the heat transfer characteristics of atomized droplets on the high-temperature SiC surface under the microwave heating was obtained which included thermophysical properties of spray medium, spray parameters, and temperatures of the high-temperature bed surface and spray medium, with the error of ?20%. These correlations can be used to predict the SMD of the atomized droplets and the power of spray heat transfer in the microwave heating process.

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Microwave-assisted pyrolysis of methyl ricinoleate for continuous production of undecylenic acid methyl ester (UAME)

Cited by 22 publications

References 10 publications

Synthesis and Characterization of Novel Polyol Esters of Undecylenic Acid As Ecofriendly Lubricants

Synthesis and Characterization of Novel Polyol Esters of Undecylenic Acid As Ecofriendly Lubricants

Measurements and Correlations of Density, Viscosity, and Vapor Pressure for Methyl Ricinoleate

Heat transfer in a novel microwave heating device coupled with atomization feeding

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