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Method for preparing biodiesel in eutectic system

A biodiesel, eutectic technology, applied in biofuels, petroleum industry, liquid carbon-containing fuels, etc., can solve the problems of strong catalyst corrosion, easy saponification of products, secondary pollution, etc.

Inactive Publication Date: 2015-01-14
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Synthetic biodiesel is a transesterification reaction that can be catalyzed by both acids and bases. Strong acids (sulfuric acid) or strong bases (KOH and NaOH) are usually used as catalysts. The catalysts are highly corrosive and difficult to separate and recover after the reaction, or the products are easy to saponify, resulting in Disadvantages such as a large amount of waste water and waste alkali (acid) liquid discharge are likely to cause secondary pollution to the environment

Method used

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  • Method for preparing biodiesel in eutectic system

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In a 100mL three-neck round bottom flask, add 30g (0.034mol) soybean oil (average molecular weight 878.25) and preheat it in a water bath at 65°C, then add 0.3g (0.0075mol) NaOH, 6g methanol (0.1875mol), 3g ethanol Melt solvent (choline chloride / glycerol molar ratio is 1:1), stirred and refluxed under normal pressure, 65°C water bath for 4.0 hours, cooled to room temperature, transferred to a separatory funnel for layering (rapid layering), The lower layer is a mixture of excess methanol, glycerin, ionic liquid, and NaOH; the upper layer is the product. After washing with hot water for 3 to 5 times, vacuum drying at 400 Pa and 80° C. gives 25.7 g of pure product with a yield of about 85%.

Embodiment 2

[0023] In a 100mL three-neck round bottom flask, add 30g (0.034mol) soybean oil (average molecular weight 878.25) and preheat it in a water bath at 65°C, then add 0.15g of NaOH, 10.9g of methanol (0.34mol), 4.5g of eutectic Solvent (choline chloride / glycerol molar ratio is 1:1), stirred and refluxed under normal pressure, 65°C water bath for 2.0 hours, cooled to room temperature, transferred to a separating funnel for layering (rapid layering), the lower layer It is a mixture of excess methanol, glycerin, ionic liquid, and NaOH; the upper layer is the product, after washing with hot water for 3 to 5 times, vacuum drying at 400 Pa and 80°C to obtain 26.0 g of pure product, with a yield of about 86%.

Embodiment 3

[0025] In a 100mL three-neck round bottom flask, add 30g soybean oil (average molecular weight 878.25) and preheat it in a water bath at 65°C, then add 1.5g of NaOH, 8g of methanol, 4g of deep eutectic solvent (choline chloride / glycerol The molar ratio is 1:1.19), stirred and refluxed for 3.0 hours under normal pressure, 65 °C water bath, cooled to room temperature, transferred to a separatory funnel for layering (rapid layering), the lower layer is excess methanol, glycerol, ionic liquid, NaOH The upper layer is the product, after washing with hot water for 3 to 5 times, vacuum drying at 400 Pa and 80° C. to obtain 26.6 g of the pure product, with a yield of about 88%.

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Abstract

The invention discloses a method for preparing biodiesel in a eutectic system. The biodiesel is prepared by stirring and heating plant oil and methyl alcohol, which are used as raw materials, under normal pressure. The method has the advantages that a sodium hydroxide catalyst is adopted, so that the cost is low, the catalysis activity is high, and the using amount is small; the reaction conditions are mild, and the reaction can be executed under normal pressure and methyl alcohol backflow temperature conditions; a eutectic solvent consists of choline chloride and glycerinum, so that an emulsification phenomenon is avoided, and the technical flow is simplified; the product is high in purity and contains few impurities; the eutectic catalysis system consisting of the eutectic solvent and the sodium hydroxide is easy to recycle and use and has an environment-friendly effect.

Description

a technical field [0001] The invention relates to a method for preparing biodiesel in a deep eutectic system, and belongs to the technical field of chemical material preparation. This method is suitable for the occasion of synthesizing biodiesel with vegetable oil and methanol as raw materials. Two background technology [0002] As a new type of renewable and clean energy, biodiesel is a liquid fuel made from oil crops, oil palm and pistachio and other oil forest fruits, engineering microalgae and other oil aquatic plants, animal fats, and waste cooking oil. It is a high-quality petroleum diesel substitute. Biodiesel is a typical "green energy". Vigorously developing biodiesel has important strategic significance for sustainable economic development, promoting energy substitution, reducing environmental pressure, and controlling urban air pollution. [0003] Synthetic biodiesel is a transesterification reaction that can be catalyzed by both acids and bases. Strong acids (s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/10
Inventor 方东姜晨宁赵志心戴兢陶王京平王彦卿邢胜先
Owner YANCHENG TEACHERS UNIV
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