Method for separating and purifying biodiesel

A biodiesel, separation and purification technology, applied in the preparation of biofuels, biomaterials, liquid hydrocarbon mixtures, etc., can solve the problems of long production cycle, low recovery rate, pollution, etc., and achieves low equipment cost and energy consumption. Simple process and the effect of reducing production costs

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process adopted by most domestic manufacturers of biodiesel has the problems of long production cycle, low product purity, low recovery rate, high cost and serious pollution
In terms of quality and environmental protection, it does not meet the European emission IV and other standards. The fatty acid methyl ester content of biodiesel reaches more than 98% and the re

Method used

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  • Method for separating and purifying biodiesel
  • Method for separating and purifying biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1. Separation and purification of biodiesel

[0072] The specific method includes the following steps:

[0073] 1) Separation and purification: the crude biodiesel product is degassed and distilled with a thin film evaporator to obtain biodiesel with a methyl ester content of 96%:

[0074] a) Separation and purification object: lipase catalyzes the crude biodiesel product obtained by the esterification reaction of soybean oil (raw oil) with methanol. The by-product glycerin (lower layer) is removed by standing or high-speed centrifugation, and the supernatant is collected (the main component is Crude fatty acid methyl ester) as the object of separation and purification in the next step;

[0075] b) Falling film evaporation: Pass the supernatant obtained in step a) through the falling film evaporator at a vacuum of -0.06MP and a temperature of 120°C for degassing to remove the components at the outlet of the falling film evaporator (in the crude product) Low boiling poi...

Embodiment 2-5

[0090] Example 2-5. Separation and purification of biodiesel using different deacidification agents

[0091] The same method as in Example 1, wherein the dosage of alkaline solution and alkaline soil is changed to obtain purified biodiesel whose acid value meets national standards. The results are shown in Table 3.

[0092] Table 3 Results of Examples 2-5

[0093] Variation factors

Embodiment 6-9

[0094] Example 6-9. Separation and purification of biodiesel from different raw materials

[0095] Such as figure 1 As shown, the method of the present invention is used to separate and purify biodiesel. The specific method is the same as that of Example 1, except that the feedstock oil for producing crude methyl ester is changed. The important indicators of purified biodiesel are shown in Table 4.

[0096] Table 4 Results of Examples 6-9

[0097] project name

Example 6

Example 7

Example 8

Example 9

Feedstock oil for producing crude methyl ester

Acidified oil

Waste oil

Rapeseed oil

Tung oil

Rotating scraper thin film evaporation

Parameters

Vacuum 60Pa

Temperature 160℃

Scraper speed

130rpm

Vacuum 130Pa

Temperature 180℃

Scraper speed

135rpm

Vacuum 70Pa

Temperature 165℃

Scraper speed

140rpm

Vacuum 110Pa

Temperature 175℃

Scraper speed

130rpm

Density (20℃)

842

874

856

847

Kinematic viscosity (40℃)

3.21

3.92

2.78

...

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Abstract

The invention discloses a method for separating and purifying biodiesel. The method comprises the steps of: 1) performing degassing and distillation operation on a crude biodiesl product by a film evaporator to obtain the biodiesl of which the content of methyl ester is over 96 percent; and 2) performing alkaline soil deacidification on a product of separation treatment in the step 1) to obtain purified biodiesel of which an acid value satisfies the national standard. By the method, alkaline solution is absorbed on the surface of alkaline soil for a deacidification reaction, which effectively avoids emulsification; the method has simple operation conditions, does not need to strictly control conditions such as stirring and the like; components such as glycerol and soap can be absorbed after the reaction is finished; the obtained methyl ester does not need to be purified again, does not need to be dehydrated, is easy to separate, and has high yield; and a purified product has high quality. The method has the advantages of simple process flow, low equipment cost and energy consumption, and no wastewater pollution, and is suitable to be popularized and applied in a large area.

Description

Technical field [0001] The invention relates to a method for separating and purifying biodiesel in the field of biochemical industry. Background technique [0002] Biodiesel is a clean fuel refined from renewable resources (such as rape oil, soybean oil, recycled cooking oil, etc.). As a new type of renewable energy, biodiesel has the characteristics of being environmentally friendly and alternative to diesel, and has been extensively studied and applied worldwide. At present, biodiesel is mainly produced by chemical methods, using vegetable oil and methanol or ethanol in an acid or alkaline catalyst and an esterification reaction at 230-250°C to generate the corresponding fatty acid methyl or ethyl biodiesel. Nowadays, researchers are still studying the technology of bio-enzymatic synthesis of biodiesel. Research results show that lipase is a good catalyst for the transesterification of alcohol and fatty acid glycerides. As a kind of biocatalyst, enzyme has high catalytic effi...

Claims

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Application Information

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IPC IPC(8): C10G3/00C10G31/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 谭天伟王敬贤张海霞王芳邓利聂开立鲁吉珂
Owner BEIJING UNIV OF CHEM TECH
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