Method of increasing the oxidation stability of biodiesel
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A technology of oxidation stability and biodiesel, applied in chemical instruments and methods, organic chemistry, petroleum industry, etc., can solve problems such as clogging and corrosion
Inactive Publication Date: 2006-10-18
DEGUSSA AG
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Produced products (including acids, resins) may cause corrosion and clogging in jet pumps and / or oil lines
Method used
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Embodiment 1
[0194] Example 1 - Preparation of samples
[0195] In a glass beaker, the primary antioxidant was dissolved in the biodiesel at 20° C. with stirring, and the stirring was continued until a clear solution of the primary antioxidant in the biodiesel was obtained. The primary antioxidants used, the biodiesel used and the ratios are shown in Table 1.
Embodiment 2
[0196] Example 2 - Composition of Primary Antioxidant Used
[0197] Primary Antioxidant 1
[0198] (obtained under the trade name IONOL 99 from Degussa AG):
[0199] >99.0% by weight of 2,6-di-tert-butylphenol
[0200] <0.5% by weight of 2-tert-butylphenol
[0201] <0.5% by weight of 2,4-di-tert-butylphenol
[0202] Primary Antioxidant 2
[0203] (obtained under the trade name IONOL K98 from Degussa AG):
[0204] >98.5% by weight of 6-tert-butyl-2,4-dimethylphenol
[0205] <1.5% by weight of 4-tert-butyl-2,6-dimethylphenol and di-tert-butylmethyl-phenols
[0206] Primary Antioxidant 3
[0207] (available from Degussa AG under the trade name IONOL K65):
[0208] >55% by weight of 6-tert-butyl-2,4-dimethylphenol
[0209] >15% by weight of 2,6-di-tert-butyl-4-methylphenol
[0210] 18-22% by weight tert-butyl-2,5-dimethylphenol
[0211] <1% by weight of 4,6-di-tert-butyl-2-methylphenol
[0212] <3.5% by weight of di-tert-butyl-3-methylphenol
[0213] <3.5% by weight o...
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melting point
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Abstract
The present invention relates to a method for increasing the oxidation stability of biodiesel, which includes adding a main antioxidant with a melting point of less than or equal to 40°C in an amount of 10-20000 ppm (w / w) into the biodiesel to be stabilized, wherein the The primary antioxidant contains at least one compound of structure I, wherein R1, R2 = hydrogen, a linear alkyl group having 1 to 20 carbon atoms or, where * is a carbon atom of an aromatic ring system, R3, R5 = hydrogen, straight-chain alkyl group having 1 to 20 carbon atoms, R4 = hydrogen, straight-chain alkyl group having 1 to 40 carbon atoms, where the substituents of type R1 and R2 are the same as the substituents of type R3 and R5. Either the same or different in each case.
Description
technical field [0001] The present invention relates to methods of increasing the oxidation stability of biodiesel. Background technique [0002] An alternative to conventional diesel fuel, which is now being used to an increasing extent, is biodiesel, which includes monoalkyl esters of vegetable oils, animal fats, and used cooking fats. Biodiesel is obtained by transesterification of oils such as rapeseed oil, soybean oil or sunflower oil and used cooking oils with alcohols in the presence of catalysts. [0003] Recently, the production of biodiesel has also received a lot of attention in recent years as it is becoming more and more important as an alternative diesel fuel for passenger cars. Biodiesel has a high content of unsaturated fatty acid esters, which can be easily oxidized by oxygen in the air. The resulting products (including acids, resins) may cause corrosion and clogging in jet pumps and / or oil lines. The ever-increasing use of alternative biodiesel as an au...
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