Method for preparing biodiesel by ester exchange

A biodiesel and transesterification technology, which is applied in the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, can solve problems such as photochemical pollution, air pollution, and energy shortages, and achieve high biodegradability, extended service life, and good Effect of low temperature engine start performance

Inactive Publication Date: 2013-11-20
王英国 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the 1970s, especially after 1991, on the one hand, oil prices have continued to rise and oil resources have been depleted, and the whole world is facing a crisis of energy shortage; on the other hand, with the improvement of human living standards and environmental protection With the enhancement of awareness, we gradually realize the seriousness of air pollution caused by petroleum as fuel, especially "photochemical pollution" which causes great harm to the human body, forcing human beings to find a new energy and "clean energy" to replace petroleum raw materials

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  • Method for preparing biodiesel by ester exchange
  • Method for preparing biodiesel by ester exchange

Examples

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Effect test

Embodiment 1

[0020] The method for preparing biodiesel by transesterification of the present invention is to make through the following steps:

[0021] a. Animal oil, methanol, and catalyst are mixed in a molar ratio of 9:0.7:0.035;

[0022] b. Heating the mixture obtained in step a to 150°C for reaction, the reaction pressure is 0.7MPa, and the reaction time is 20 minutes;

[0023] c, distilling and separating the reactants obtained in step b to obtain crude glycerin, methanol and crude biodiesel;

[0024] d, re-distilling the biodiesel obtained in step c, and controlling the temperature at 150° C., to obtain biodiesel and by-product residue;

[0025] Described catalyst is ionic liquid catalyst R + -(CH 2 ) n -SO 3 - Ionic liquid, wherein, R is pyridine, methylimidazole or triethylamine; n is a carbon chain CH 2 number; the animal oil is lard, or tallow, or suet.

Embodiment 2

[0027] The method for preparing biodiesel by transesterification of the present invention is characterized in that it is prepared through the following steps:

[0028] a. Grease, methanol, and catalyst are mixed in a molar ratio of 15:1.3:0.5;

[0029] b. Heating the mixture obtained in step a to 190°C for reaction, the reaction pressure is 1.3MPa, and the reaction time is 40 minutes;

[0030] c, distilling and separating the reactants obtained in step b to obtain crude glycerin, methanol and crude biodiesel;

[0031] d. Re-distilling the biodiesel obtained in step c, and controlling the temperature at 190° C. to obtain biodiesel and by-product residue;

[0032] Described catalyst is ionic liquid catalyst R + -(CH 2 ) n -SO 3 - Ionic liquid, wherein, R is pyridine, methylimidazole or triethylamine; n is a carbon chain CH 2 number.

Embodiment 3

[0034] The method for preparing biodiesel by transesterification of the present invention is characterized in that it is prepared through the following steps:

[0035] a. Vegetable oil, methanol, and catalyst are mixed in a molar ratio of 12:1:0.042;

[0036] b. Heating the mixture obtained in step a to 170° C. for reaction, the reaction pressure is 1.0 MPa, and the reaction time is 30 minutes;

[0037] c, distilling and separating the reactants obtained in step b to obtain crude glycerin, methanol and crude biodiesel;

[0038] d. Re-distilling the biodiesel obtained in step c, and controlling the temperature at 170° C. to obtain biodiesel and by-product residue;

[0039] Described catalyst is ionic liquid catalyst R + -(CH 2 ) n -SO 3 - Ionic liquid, wherein, R is pyridine, methylimidazole or triethylamine; n is a carbon chain CH 2 number; the vegetable oil is castor oil, or rapeseed oil, or soybean oil.

[0040] The method for preparing biodiesel by transesterificati...

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Abstract

The invention relates to a method for preparing biodiesel through ester exchange, which comprises the following steps: mixing grease, methanol and catalyst according to the mol ratio of 9-15: 0.7-1.3:0.035-0.5; heating the obtained mixture to perform reaction at a temperature of between 150 and 190 DEG C and at a reaction pressure of between 0.7 and 1.3 MPa for 20 to 40 minutes, then distilling and separating the mixture to prepare glycerol, methanol and crude biodiesel; and redistilling the obtained biodiesel and controlling the temperature between 150 and 190 DEG C so as to prepare the biodiesel and the byproduct residual oil. The method for preparing the biodiesel through the ester exchange has the reaction conversion rate reaching more than 90 percent, and the product is environment-friendly with good lubricity.

Description

technical field [0001] The invention relates to biodiesel, in particular to a method for preparing biodiesel by transesterification. Background technique [0002] Biodiesel is fatty acid methyl ester, which can be used as a substitute for petroleum. It is an environmentally friendly, renewable energy and industrial raw material mainly made of animal and vegetable oil or oil feet. As early as the end of the 19th century, Rudolf Diesel successfully used peanut oil as an engine fuel, and made its debut at the Paris World Expo in 1990. Although due to price reasons, its application has been very limited. However, since the 1970s, especially after 1991, on the one hand, the price of oil has continued to rise and oil resources have been depleted, and the whole world is facing a crisis of energy shortage; on the other hand, with the improvement of human living standards and environmental protection With the enhancement of awareness, we gradually realize the seriousness of air po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P20/52Y02P30/20
Inventor 王英国徐荣江
Owner 王英国
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