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Method for efficiently preparing biodiesel by enzymatic method

A biodiesel, high-efficiency technology, applied in the direction of biofuel, fermentation, etc., can solve the problem of limited source of biodiesel raw materials, achieve good economic and environmental benefits, shorten the reaction time, and reduce the effect of requirements

Inactive Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of limited sources of raw materials for producing biodiesel with high conversion rate and high yield

Method used

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  • Method for efficiently preparing biodiesel by enzymatic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The soybean oil is saponified into soybean oil fatty acid, which is then added to the soybean oil, and the content of the fatty acid in the soybean oil is controlled to be 7%. Add soybean oil and methanol containing 7% fatty acid to a 250mL Erlenmeyer flask according to a molar ratio of 1:1, add MAS 1 lipase based on 30 enzyme activity units per unit raw material oil quality, and in a water bath at 40°C, the reaction speed is 200rpm, methanol was added every 2 hours, and after 6 hours of reaction, the conversion rate of triglyceride reached 96.0%, the yield of fatty acid methyl ester reached 98.0%, and the acid value dropped to 0.60 mg / g.

Embodiment 2

[0031] The tallow is saponified into fatty acids, which are then added to the tallow, and the fatty acid content in the tallow is controlled to be 8%. Add tallow and methanol containing 8% fatty acid to a 250mL Erlenmeyer flask according to a molar ratio of 1:1, add MAS 1 lipase based on 30 enzyme activity units per unit raw material oil quality, and in a water bath at 50°C, the reaction speed is 200rpm, methanol was added every 2 hours, and after 6 hours of reaction, the conversion rate of triglyceride reached 98.0%, the yield of fatty acid methyl ester reached 98.0%, and the acid value decreased to 0.50 mg / g.

Embodiment 3

[0033] The peanut oil is saponified into peanut oil fatty acid, which is then added to the peanut oil, and the fatty acid content in the peanut oil is controlled to be 10%. Add peanut oil and methanol containing 10% fatty acid to a 250mL Erlenmeyer flask at a molar ratio of 1:1, add 30 enzyme activity units of MAS 1 lipase based on the unit raw material oil mass, and place in a water bath at 40°C with a reaction speed of 200rpm , adding methanol every 2 hours, after 6 hours of reaction, the conversion rate of triglycerides reached 96.5%, the yield of fatty acid methyl esters reached 97.0%, and the acid value was reduced to 0.80 mg / g.

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Abstract

The invention belongs to the field of biomass energy chemical industry, and provides a method for efficiently preparing biodiesel by an enzymatic method. The method comprises the following steps: (1)adding corresponding fatty acid into raw oil to prepare raw oil with a fatty acid content of 5-80%; and (2) performing reacting on the raw oil obtained in the step (1) with low-carbon alcohol under catalysis of lipase to obtain the biodiesel. According to the invention, through control of the content of fatty acid in the raw materials, the reaction time is shortened, the acid value is obviously reduced, and the conversion rate of triglyceride in the raw material oil and the yield of the biodiesel are effectively improved. According to the method, the fatty acid content in the raw materials iscontrolled, and when the reaction temperature is between 40 and 60 DEG C and the reaction time is between 6 and 10 hours, the conversion rate of triglyceride and the yield of fatty acid methyl ester can both reach 93% or above. The method effectively reduces requirements on raw materials, enlarges the source range of the raw materials and has better economic benefit and environmental benefits.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and relates to a method for efficiently preparing biodiesel by enzymatic method. Background technique [0002] Biodiesel is a kind of long-chain fatty acid esters produced by esterification or transesterification of bio-oil raw materials, and its combustion index is equal to or better than that of petrochemical diesel. Compared with petrochemical diesel, biodiesel is biodegradable and non-toxic, and its combustion has far less harmful effects on the environment than traditional petrochemical diesel. Therefore, biodiesel can be used as a new environmentally friendly energy alternative to petrochemical diesel. [0003] In recent years, the preparation method of biodiesel is mainly based on acid-base catalysis. The corresponding fatty acid esters are synthesized by using the characteristic that animal and vegetable oils can undergo transesterification reaction with short-chain alcoho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/64
CPCC12P7/649Y02E50/10
Inventor 王永华戚穗坚何诗杨博王卫飞蓝东明
Owner SOUTH CHINA UNIV OF TECH
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