Effects of Light Wavelengths on Oxidative Stability of Biodiesel

doi:10.11944/j.issn.1000-0518.2019.11.190041

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (11): 1301-1307.DOI: 10.11944/j.issn.1000-0518.2019.11.190041

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Effects of Light Wavelengths on Oxidative Stability of Biodiesel

WANG Youhao^a,LI Fashe^a^b^*(),WANG Wenchao^a^b,CHEN Yu^a^b

a Faculty of Metallurgical and Energy Engineering
b Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction,Kunming University of Science and Technology,Kunming 650093,China

Received:2019-02-18 Accepted:2019-05-29 Published:2019-11-01 Online:2019-11-05
Contact: LI Fashe
Supported by:
Supported by the National Natural Science Foundation of China(No.51766007), and the Natural Science Foundation of Yunnan Province(No.2018FB092)

Abstract

Abstract:

In order to study the effect of light on the oxidation stability of biodiesel, the jatropha biodiesel was treated with light in different wavelengths at 20 ℃ for 48 hours. The treated samples were then analyzed for oxidative stability. The results showed that light promoted the oxidation of biodiesel. The short-wavelength light represented by violet light had the strongest promoting effect on the oxidation of jatropha oil biodiesel. The induction period decreased from 5.12 h to 2.65 h in 48%; the red light with longer wavelength has the weakest promoting effect on the oxidation of biodiesel, and the induction period is reduced to 4.61 h, which is reduced in 10%. The acid value titration, composition analysis and UV characterization of light-treated biodiesel with different wavelengths showed that the acid value of biodiesel increased from 0.2577 mg/g to 0.3438 mg/g as the wavelength of light decreased. The relative content of methyl linoleate in the carbon-carbon double bond decreases; the absorption peak of the conjugated double bond increases. This shows that the shorter the wavelength of light, the stronger the promotion toward biodiesel oxidation.

Key words: biodiesel, oxidation stability, photooxidation

WANG Youhao,LI Fashe,WANG Wenchao,CHEN Yu. Effects of Light Wavelengths on Oxidative Stability of Biodiesel[J]. Chinese Journal of Applied Chemistry, 2019, 36(11): 1301-1307.

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Effects of Light Wavelengths on Oxidative Stability of Biodiesel

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