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Method for producing biological diesel oil

A biodiesel, animal and vegetable oil technology, applied in the direction of preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of complex product purification process, harsh reaction conditions, and difficult engineering, so as to reduce environmental pollution, reaction The effect of fast speed and saving production cost

Inactive Publication Date: 2009-12-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main processing method of biodiesel is chemical method. Inorganic acid and alkali are often used as transesterification catalysts. The reaction conditions are relatively mild, but alkalis are easily used as catalysts to cause saponification, which requires extremely low water content in raw materials. Complicated, the product needs to be washed and purified, resulting in a large amount of waste water; acid is used as a catalyst to corrode metal parts of engines and high-temperature, high-pressure supercritical reaction devices
Without adding any catalyst, the transesterification reaction can also be realized in the supercritical low-carbon alcohol system. The reaction speed is extremely fast and only takes a few minutes, but the reaction conditions are extremely harsh. According to reports, high temperatures of 350-400°C and 45-65MPa are required High pressure, difficult to realize in engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the production of biodiesel

[0022] Set the high temperature and high pressure supercritical reaction device (maximum temperature is 350°C, maximum pressure is 45Mpa, diameter 50mm, height 128mm, Jiangsu Haian Petroleum Research Instrument Factory) and the preheating temperature of the preheater are both 260°C. Dissolve 0.0405 g of catalyst sodium methoxide in 90 ml of anhydrous methanol. After the high-temperature, high-pressure supercritical reaction device and the preheater reached the preheating temperature and were stable, 90ml (81g) rapeseed oil crude oil (average molecular weight 900) and the above-mentioned 90ml methanol solution were squeezed into with a pump (catalyst consumption is 1% of the oil quality) 0.5‰, the molar ratio of methanol to crude rapeseed oil is 24:1), the raw material first flows into the preheater to be preheated, and then flows into the high temperature and high pressure supercritical reaction device. Start stirring (400rpm...

Embodiment 2

[0025] Embodiment 2, the production of biodiesel

[0026] Except that the catalyst is potassium methylate and the reaction time is 18 minutes, other production methods are the same as those described in Example 1 to produce biodiesel.

[0027] The biodiesel obtained above was analyzed by GC-FID using an internal standard method, and the internal standard was methyl heptadecanoate. By comparing the retention time of the standard sample, determine the type of fatty acid methyl ester in the sample to be tested; by comparing the peak area size of each fatty acid methyl ester in the sample to be tested with the standard sample, determine the concentration of fatty acid methyl ester in the sample to be tested content. The results show that the biodiesel obtained by this method contains 8 kinds of fatty acid methyl esters, namely methyl palmitate, methyl stearate, methyl oleate, methyl linoleate, methyl linolenate, eicosene acid methyl ester, docosenoic acid methyl ester and tetrac...

Embodiment 3

[0029] Embodiment 3, the production of biodiesel

[0030] Set the high temperature and high pressure supercritical reaction device (maximum temperature is 350°C, maximum pressure is 45Mpa, diameter 50mm, height 128mm, Jiangsu Haian Petroleum Research Instrument Factory) and the preheating temperature of the preheater are both 260°C. 0.0162 g of catalyst sodium methoxide was dissolved in 90 ml of anhydrous methanol. After the high-temperature, high-pressure supercritical reaction device and the preheater reached the preheating temperature and were stable, 90ml (81g) rapeseed crude oil (average molecular weight was 900) and the above-mentioned 90ml methanol solution containing sodium methylate were squeezed into (catalyst The amount of sodium methoxide is 0.2‰ of the oil quality, the molar ratio of methanol to rapeseed oil is 24:1), the raw material first flows into the preheater to be preheated, and then flows into the high temperature and high pressure supercritical reaction d...

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Abstract

The present invention discloses method of producing biological diesel oil. In the presence of low carbon alkoxide of alkali metal as catalyst and under the conditions of 150-300 deg.c temperature and 2-30 MPa pressure, animal and vegetable fat and low carbon alcohol are made to produce catalytic ester interexchange reaction to produce biological diesel oil. The present invention has the advantages of high reaction speed, high biological diesel oil yield, low production cost and less environmental pollution.

Description

technical field [0001] The invention relates to a method for producing biodiesel. Background technique [0002] In recent decades, due to the increasing depletion of oil resources, rising oil prices and people's increasing concern for environmental protection issues, the research on fuel substitutes for diesel engines has become more and more important. [0003] In 1984, scientists from the United States, Germany and other countries studied fatty acid low-carbon alcohol esters obtained from animal and vegetable oils, including fatty acid methyl esters, fatty acid ethyl esters, and fatty acid propyl esters (commonly known as biodiesel) instead of diesel combustion. Compared with traditional petrochemical diesel, biodiesel has the following advantages: using renewable animal and vegetable oils as raw materials, it can reduce the demand and import of fossil fuel oil; it is environmentally friendly, and the amount of toxic organic substances in biodiesel tail gas is only It is ...

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 杨基础王连鸳朱慎林贺华阳汤志勇
Owner TSINGHUA UNIV
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