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Method for preparing biodiesel by using microalgae lipid as raw material

A biodiesel and microalgae oil technology, applied in the field of bioengineering and clean energy, can solve the problems of environmental restrictions, long growth cycle, high price, etc., and achieve the effects of reducing environmental pollution, high industrial value, and easy control

Active Publication Date: 2009-12-30
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fact that most countries in the world currently use oil plants, food crops and other raw materials, which have the characteristics of high cost, long growth cycle and environmental restrictions, the price of biodiesel is higher than or close to that of traditional diesel.

Method used

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  • Method for preparing biodiesel by using microalgae lipid as raw material
  • Method for preparing biodiesel by using microalgae lipid as raw material
  • Method for preparing biodiesel by using microalgae lipid as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Utilize the organic solvent extraction method to carry out the extraction of microalgae oil

[0035] Collect Dunaliella salina by centrifugation, then add water and n-hexane at a mass ratio of algae:water:n-hexane of 1:2:3, vibrate to extract microalgae oil, after standing for a period of time, the supernatant is oil extraction liquid, the supernatant was distilled under normal pressure at 70-100°C to obtain microalgae oil, and the distilled n-hexane was recovered and recycled.

Embodiment 2～5

[0036] Examples 2-5: Effects of different alcohol-oil molar ratios on the yield of microalgae biodiesel

[0037] The reaction conditions are: the molar ratio of alcohol to oil is 30:1, 40:1, 50:1, 60:1 respectively, and the reaction temperature is 70°C. Catalyst 98% concentrated sulfuric acid consumption is 100% (based on raw material oil weight). Reaction time 4h.

[0038] Add the microalgae oil and methanol prepared in Example 1 into a four-necked flask, and add the catalyst concentrated sulfuric acid dropwise from a constant pressure dropping funnel, seal the four-necked flask, stir, and reflux. The four-neck flask was heated by an oil bath. After the reaction is over, separate the upper and lower layers in a separating funnel, namely the crude product and the crude glycerin layer, and obtain biodiesel fines and glycerin after distillation and other methods. Methanol is recovered by distillation and can be recycled.

[0039] During the reaction, the amount of small mole...

Embodiment 6～14

[0040] Examples 6-14: Effects of different reaction temperatures on the yield of microalgae biodiesel

[0041] The reaction conditions are: the molar ratio of alcohol to oil is 40:1, and the reaction time is 4h. Temperature is 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ respectively, and the consumption of catalyst 98% concentrated sulfuric acid is 100% (based on raw oil weight).

[0042] Add the microalgae oil and methanol prepared in Example 1 into a four-necked flask, and add the catalyst concentrated sulfuric acid dropwise from a constant pressure dropping funnel, seal the four-necked flask, stir, and reflux. The four-neck flask was heated by an oil bath. After the reaction is over, separate the upper and lower layers in a separating funnel, namely the crude product and the crude glycerin layer, and obtain biodiesel fines and glycerin after distillation and other methods. Methanol is recovered by distillation and can be recycled.

[0043] When the reaction tem...

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Abstract

The invention provides a comprehensive utilization method for preparing biodiesel and glycerine by using microalgae lipid as a raw material. The method integrates microalgae lipid extraction technology, ester exchange reaction technology, technology for producing biodiesel with high purity and high performance and technology for effectively reclaiming byproduct glycerine, and provides a method for completely preparing the biodiesel by using the microalgae lipid as the raw material. The method has the characteristics of simple flow, high efficiency, low cost, high product quality, low ambient pressure and the like, is easy to realize in the industry, and has good industrial application value.

Description

technical field [0001] The invention belongs to the fields of bioengineering and clean energy, relates to a method for preparing biodiesel and glycerin by using microalgae oil as a raw material, and is a complete set of methods for preparing biodiesel. Background technique [0002] In recent years, due to the rise of oil prices, the emergence of energy crises, and the excessive use of gasoline has caused air pollution, affecting human health. At this time, people's attention once again focused on the renewable bio-energy - biodiesel. [0003] Biodiesel is mainly fatty acid methyl ester, which has the characteristics of biodegradability, non-toxicity, low pollution discharge, and abundant raw materials for production. Therefore, it is a very promising environment-friendly green fuel. Currently, most countries in the world use oil plants, food crops and other raw materials, which have the characteristics of high cost, long growth cycle and environmental restrictions, making ...

Claims

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Application Information

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IPC IPC(8): C10G3/00C11C3/04
CPCY02E50/13C12P7/649C12P7/64C10G2300/1011C12P7/20Y02P30/20Y02E50/10C12R2001/89C12N1/125
Inventor 石蕾张惠敏刘敏胜
Owner ENN SCI & TECH DEV
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