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Method of preparing biological diesel oil by methanol critical low alkali process

A biodiesel and methanol technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of long reaction time and low methyl ester content, and achieve the effect of simplified separation and purification and simplified subsequent processing.

Inactive Publication Date: 2008-01-30
JIANGSU POLYTECHNIC UNIVERSITY
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Problems solved by technology

This work also has the characteristics of simple post-treatment of supercritical method, and the molar ratio of alcohol to oil, reaction temperature and pressure are lower than supercritical method, but the reaction time is longer and the content of methyl ester is lower

Method used

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  • Method of preparing biological diesel oil by methanol critical low alkali process

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Comparison scheme
Effect test

Embodiment 1

[0012] In a 1L autoclave with magnetic stirring, 100.0 grams of crude rapeseed oil and 146.7 grams of industrial grade methanol were added respectively. 3ml of methanol, stirring and heating to 240±5°C, after the pressure is 6.9MPa, the reaction is completed after 120 minutes of timing reaction, the excess methanol is distilled, the reaction solution is poured into the separatory funnel while it is hot, and the lower layer is crude biodiesel , the upper layer is the by-product crude glycerin, the pH value of the upper and lower layers is 6-7, and samples were taken separately, and the analysis results are listed in the table below.

[0013] The pH value of the crude product of the upper and lower layer reaction is 6-7, so there is no need for post-treatment, which avoids the process of acid neutralization and water washing in the usual alkali-catalyzed method, and effectively prevents the generation of industrial sewage. The content of methyl ester detected by chromatography i...

Embodiment 2

[0015] Change the alkali catalyst add-on into 0.1% in the above-mentioned embodiment 1, other conditions are identical, and test result is listed in the table. The pH value of crude glycerol, a by-product of the reaction in the upper layer, is 7-8, and the pH value of crude biodiesel, a reaction product in the lower layer, is 6-7, without post-treatment. The content of methyl ester detected by chromatography is 99.1%, and the yield of biodiesel is as high as 99.7%.

Embodiment 3

[0017] The alcohol-oil mol ratio of above-mentioned embodiment 1 is reduced to 21: 1, other conditions are identical, and test result is listed in the table. The pH value of the crude product of the upper and lower layer reactions is 6-7, and there is still no need for post-treatment. The content of methyl ester detected by chromatography is 95.1%, and the yield of biodiesel is as high as 97.3%.

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Abstract

The present invention belongs to a new process for preparing biological energy. It is characterized by that said invention adopts vegetable oil and critical methyl alcohol, under the catalysis of minute quantity of alkali whose added quantity is 0.05%-0.1% makes the vegetable oil and critical methyl alcohol implement ester exchange reaction so as to obtain neutral crude product biological diesel oil and by-product glycerin.

Description

technical field [0001] The invention belongs to a new bioenergy preparation process, in particular to a method for preparing biodiesel by a methanol critical low-alkali method. Background technique [0002] Biodiesel is a renewable clean fuel that can replace petrochemical diesel. Animal and vegetable oils, waste edible oils, etc. can be used as raw materials to carry out transesterification reactions with alcohols such as methanol and ethanol, and the product is fatty acid methyl ester (hereinafter referred to as methyl ester), and the by-product is glycerol. The traditional transesterification reaction uses a homogeneous catalyst, such as NaOH, KOH, sodium methylate, etc., and the dosage is about 1% based on vegetable oil. The reaction temperature is generally the boiling point of methanol, and the reaction time is 1 hour. The conversion rate is high, reaching more than 95%. But there are also obvious disadvantages at the same time. Although the reaction of alkali catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 邬国英林西平李为民周永生
Owner JIANGSU POLYTECHNIC UNIVERSITY
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