Method for modifying biological diesel oil

A biodiesel and modification technology, which is applied to the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, etc., can solve the problem that the cost reduction effect of biodiesel is not obvious, and achieve low production costs, convenient operation, and lower prices Effect

Inactive Publication Date: 2008-11-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of this patent have shown through experiments that with the increase of methanol addition, the amount of surfactant will increase thereupon. When the amount of methanol reaches 40%, the addition of relevant surfactant will exceed more than 10%. The price of the surfactant is generally more expensive, which will offset the cost reduction effect of methanol due to the addition of a large amount of surfactant; if a small amount of methanol is added, such as when the amount of methanol added is 5% to 15% of the amount of biodiesel, The effect of reducing the cost of biodiesel is not obvious
However, there is no report on the chemical modification of biodiesel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 200g of biodiesel to the three-necked flask, then add 30g of formic acid and sulfuric acid, heat to 70°C under stirring, add 15g of concentrated nitric acid dropwise within 0.1 hour, continue the constant temperature reaction for 0.5 hour, take out the product and let it stand for stratification. Take it out, neutralize it with lye to pH = 7-8, wash it twice with distilled water, then let it stand for stratification, take the upper liquid and carry out vacuum distillation and drying at 50°C to obtain 210g of modified biodiesel product, the yield is 105%.

[0019] The miscibility experiment with methanol shows that the obtained product can be miscible with methanol in any proportion. After testing, the cetane number is above 65.

Embodiment 2

[0021] Add 200g of biodiesel to the three-neck flask, then add 45g of formic acid and phosphoric acid, heat to 50°C under agitation, add 10g of concentrated sulfuric acid dropwise within 1 hour, continue to react at constant temperature for 2 hours, take out the product and let it stand for stratification. Take it out, neutralize it with lye to pH = 7-8, wash it twice with distilled water, then let it stand for stratification, take the upper liquid and carry out vacuum distillation and drying at 50°C to obtain 205g of modified biodiesel product, the yield was 102.5%.

[0022] The miscibility experiment with methanol shows that the obtained product can be miscible with methanol in any proportion. After testing, the cetane number is above 60.

Embodiment 3

[0024] Add 200g of biodiesel to the three-necked flask, then add 50g of acetic acid and phosphoric acid, heat to 40°C under stirring, add 7g of concentrated sulfuric acid dropwise within 1 hour, continue the reaction at constant temperature for 4 hours, take out the product and let it stand for stratification, and remove the upper liquid Take it out, neutralize it with lye to pH = 7-8, wash it twice with distilled water, then let it stand for stratification, take the upper liquid and carry out vacuum distillation and drying at 50°C to obtain 215g of modified biodiesel product, the yield was 107.5%.

[0025] The miscibility experiment with methanol shows that the obtained product can be miscible with methanol in any proportion. After testing, the cetane number is above 60.

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Abstract

The invention discloses a modified method of biological diesel, which comprises the following steps: adding organic carboxyl modifier and inorganic acid modifier and biological diesel of plant oil in the autoclave; stirring; heating to 30-80 deg.c; adding oxidation modifier at even speed within 0.1-10 h; reacting for 0.5-5 h under constant temperature; stewing to laminate; neutralizing the upper layer liquid to 7-8 pH value; washing and drying to generate the product. The invention creates excellent economical environment, which changes the present condition of vehicle diesel to depend oil diesel.

Description

technical field [0001] The invention relates to a method for preparing or modifying diesel oil, in particular to a method for modifying biodiesel, a renewable energy source, by using chemical methods. technical background [0002] Biodiesel is renewable, environmentally friendly, and the engine emission index is NO X In addition, it can meet the European No. 3 emission standard, and the existing diesel engine can be directly applied, which is one of the most suitable substitutes for petroleum diesel. At present, there are four main methods for preparing biodiesel: dilution, pyrolysis, microemulsion and transesterification. Transesterification methods include homogeneous acid-base catalysis, heterogeneous acid-base catalysis, biocatalysis and supercritical methods. Among them, the homogeneous base-catalyzed method in the transesterification method has short reaction time and low production cost, and is currently the most commonly used method. [0003] However, the raw mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G17/06C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 李忠张小兵米杰鲍卫仁谢克昌
Owner TAIYUAN UNIV OF TECH
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