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A method for synthesizing biodiesel in a deep eutectic system

A synthetic biology and eutectic technology, which is used in biofuels, petroleum industry, liquid carbon-containing fuels, etc., can solve the problems of difficult separation and recovery, strong catalyst corrosion, secondary environmental pollution, etc., and achieves a reduction in equipment and costs. The effect of investing, simplifying the production process and improving production efficiency

Active Publication Date: 2019-11-26
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Synthetic biodiesel is a transesterification reaction that can be catalyzed by both acid and base. Usually, strong acid (sulfuric acid) or strong base (KOH and NaOH) are used as catalysts. The post-treatment stage is easy to saponify, producing a large amount of waste water, and the discharge of waste alkali (acid) liquid is easy to cause secondary pollution to the environment, etc.

Method used

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  • A method for synthesizing biodiesel in a deep eutectic system
  • A method for synthesizing biodiesel in a deep eutectic system

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In a 100mL three-necked round-bottomed flask, add 2.24g N-sulfonic acid propyl-N, N, N-trihydroxyethylammonium, 0.76g glycerin (molar ratio is 1:1), 30g (0.034mol) soybean oil (average molecular weight 878.25), heated in a water bath at 65°C for 10 minutes (to reduce the viscosity of the vegetable oil), then added 0.3g (0.0075mol) NaOH, 6g methanol (0.1875mol), and stirred and refluxed under a water bath at 65°C for 4.0 hours. Cool to room temperature, transfer to a separatory funnel for stratification (rapid stratification), the lower layer is a mixture of excess methanol, glycerin, deep eutectic solvent, NaOH; the upper layer is the product, washed 3 to 5 times with hot water, 400Pa, 80 Vacuum drying at °C yielded 25.7 g of pure product with a yield of about 85%.

Embodiment 2

[0035] In a 100mL three-necked round-bottomed flask, add 2.98g N-sulfonic acid propyl-N, N, N-trihydroxyethylammonium, 1.52g glycerol (molar ratio is 1:1), 30g (0.034mol) soybean oil ( Average molecular weight 878.25), heated under 65 ℃ water bath for 10 minutes, then added 0.15g of NaOH, 8.7g of methanol (0.27mol), 4.5g of deep eutectic solvent (N-sulfonic acid propyl-N, N, N-trihydroxy Ethylammonium / glycerol molar ratio is 1: 1.5), reflux reaction under normal pressure under 65°C water bath for 2.0 hours, cooled to room temperature, transferred to a separatory funnel for layering (rapid layering), the lower layer is excess methanol, glycerin , a mixture of deep eutectic solvent 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 the pure product, with a yield of about 86%.

Embodiment 3

[0037] In a 100mL three-necked round-bottomed flask, add 1.98g N-sulfonic acid propyl-N, N, N-trihydroxyethylammonium, 2.02g glycerin (molar ratio is 1:3), 30g soybean oil (average molecular weight 878.25 ), heated in a water bath at 65°C for 10 minutes, then added 1.5g of NaOH, 8g of methanol, stirred and refluxed under normal pressure in a water bath at 65°C for 3.0 hours, cooled to room temperature, and transferred to a separatory funnel for layering (rapid layering), the lower layer It is a mixture of excess methanol, glycerin, deep eutectic solvent, and NaOH; the upper layer is the product, after washing with hot water for 3 to 5 times, vacuum drying at 400Pa and 80°C to obtain 26.6g of pure product, with a yield of about 88%.

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Abstract

The invention discloses a method for synthesizing biodiesel in a eutectic system. The biodiesel is obtained by taking vegetable oil and methanol as raw materials and performing stirring and heating at a normal pressure in the eutectic system composed of N-sulfopropyl-N,N,N-trihydroxyethyl ammonium and glycerol. The method disclosed by the invention has the following advantages: (1) a sodium hydroxide catalyst is adopted, and is low in cost, high in catalytic activity and little in dosage; (2) the reaction condition is mild to ensure that reaction can be carried out at a normal pressure and a methanol refluxing temperature; (3) a eutectic solvent in the composition eliminates emulsification and then the process flow is simplified; (4) the product is high in purity and few in impurity; and (5) a eutectic catalytic system composed of the eutectic solvent and sodium hydroxide facilitates recycling, and does not contain halide ions, thereby being safe and reliable for environment and metal equipment.

Description

[0001] A technical field [0002] The invention relates to a method for synthesizing 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. [0003] Two background technology [0004] 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. [0005] Synthetic biodiesel is a transesterification reaction that can be catalyzed by both acid and base....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/10C10L1/02
CPCC10L1/02C11C3/10Y02E50/10
Inventor 方东彭欢戴兢陶陈社云武力左孙思宇黄雄郁闯
Owner YANCHENG TEACHERS UNIV
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