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Method for preparing biodiesel by solvent reinforcement rapid in-situ transesterification

A technology of transesterification and solvent strengthening, which is applied in the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, etc., can solve the problems of low efficiency, low product yield, and large amount of low-carbon alcohols.

Inactive Publication Date: 2010-03-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low efficiency, low product yield and large amount of low-carbon alcohol in ordinary in-situ transesterification reaction, so as to produce biodiesel rapidly and economically

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 20g sunflower seeds (45.63% oil content) and grind them. Weigh 0.2084g sodium hydroxide according to catalyst / oil molar ratio 0.50:1, measure 42.61ml methanol according to alcohol / oil molar ratio 101.4:1, measure 102.57ml diethoxy For methane, dissolve sodium hydroxide in methanol and mix with diethoxymethane, then pour the mixed solution into a round bottom flask containing sunflower seeds, react at 25°C, and stir at 200rpm. After reacting for 13 minutes, 8.79 g of biodiesel product was isolated, with a product yield of 95.9%. According to gas chromatography analysis, the fatty acid methyl ester content was 97.7%.

Embodiment 2

[0022] Weigh 20g of sunflower seeds and crush them. Weigh potassium hydroxide by catalyst / oil molar ratio 1.8:1, measure methanol by alcohol / oil molar ratio 248:1, measure diethoxymethane by solubilizer / oil molar ratio 50:1, and potassium hydroxide After dissolving in methanol, mix with diethoxymethane, pour into a round bottom flask containing sunflower seeds, react at 50°C, and stir at a speed of 300rpm. After reacting for 11 minutes, 8.70 g of biodiesel product was isolated and analyzed by gas chromatography, and the content of fatty acid methyl ester was 92.3%.

Embodiment 3

[0024] Weigh 20g of sunflower seeds and crush them. Take by weighing sodium hydroxide by catalyst / oil molar ratio 1.0:1, measure methanol by alcohol / oil molar ratio 262:1, measure diethoxymethane by solubilizer / oil molar ratio 16.92:1, put sodium hydroxide After dissolving in methanol, mix with diethoxymethane, pour into a round bottom flask containing sunflower seeds, react at 40°C, and stir at a speed of 300rpm. After reacting for 15 minutes, 8.235 g of biodiesel product was isolated and analyzed by gas chromatography, and the content of fatty acid methyl ester was 98.58%.

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Abstract

The invention relates to a method for preparing biodiesel by solvent reinforcement rapid in-situ transesterification; the method is characterized in that: cosolvent is added in the in-situ transesterification of lower carbon alcohol and grease-containing raw material to improve leaching rate of the grease, reduce mass transferring resistance of the grease and the lower carbon alcohol, accelerate in-situ transesterification ratio and simplify the production process of the biodiesel. The rapid in-situ transesterification is carried out to the grease-containing raw material, the refining steps ofgrease extraction, discoloring, degumming, deacidification, dephosphorization and dewaxing and the like are omitted, and the general in-situ transesterification time is shortened to about ten minutesfrom a couple of hours under normal pressure and temperature, alcohol-oil mol ratio is reduced to 100:1 from 300:1-540:1.

Description

technical field [0001] The invention relates to a process for adding a solubilizer in the in-situ transesterification reaction process to improve the oil leaching rate and the in-situ transesterification reaction rate, and belongs to the technical field of oil chemistry and renewable energy. Background technique [0002] With the global fossil energy reserves dwindling and environmental pollution increasing, countries all over the world are turning their attention to renewable energy. Among them, biodiesel, which has similar physical and chemical properties to petrochemical diesel, has become one of the hot spots in the development of bioenergy in recent years. Biodiesel is a fatty acid ester substance produced by transesterification of renewable animal and vegetable oils. In addition to being used as biofuel, it is also widely used in food, textile, resin and mechanical processing industries. [0003] At present, biodiesel is mainly prepared by transesterification reaction...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王玉春曾建立王晓东赵兵袁晓凡
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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