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New method for producing biology diesel oil from vegetable oil

A biodiesel and vegetable oil technology, applied in the fields of environmental protection and renewable energy, can solve problems such as reaction temperature, high pressure conditions, many post-processing procedures, and affect product quality, and achieve enhanced mutual solubility, simple and easy-to-control reaction process, The effect of reducing the tipping point

Inactive Publication Date: 2005-06-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The chemical catalysis method uses acid or alkali catalysts. Although the reaction conditions are mild, there are some shortcomings that cannot be eliminated by themselves: such as complex process, many post-processing procedures, large loss, high cost, acid and alkali in the production process severely corrode the equipment and affect product quality. , easy to cause secondary pollution, etc.
At present, the supercritical method is in the emerging stage of research and is receiving widespread attention. Its limitation is that when only vegetable oil reacts with small molecule alcohols, the reaction temperature and pressure conditions are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 58.1 grams of soybean oil and 70.5 grams of methanol into the autoclave, seal the reactor and replace the air in the reactor with inert gas, add 36 grams of co-solvent CO 2 . The pressure and temperature of the reactor are monitored in real time by instruments. The autoclave is heated by an external heater, and the temperature in the autoclave is monitored by Fe and Cu-Ni alloy thermocouples. Adjust the voltage to reach 300°C within 30 minutes, control ±5°C, and complete the transesterification reaction within 25 minutes. Finally, it was transferred to a water bath to stop the reaction.

[0028] After the reaction, discharge gas, pour the mixture in the autoclave into the collector, and wash the autoclave with methanol. The product to be treated was settled for 60 minutes and separated into three layers, the uppermost layer being methanol phase, which was separated. The remaining two layers were separated and distilled at 60-80°C for 30 minutes respectively, and...

Embodiment 2

[0031] Put 58.1 grams of transgenic soybean oil and 89.7 grams of methanol into a high-pressure reactor, seal the reactor and replace the air in the reactor with an inert gas, and add 24 grams of short-chain alkanes with less than 3 carbons as a co-solvent. The pressure and temperature of the reactor are monitored in real time by instruments. The autoclave is heated by an external heater, and the voltage is adjusted to reach 270°C within 30 minutes, controlled at ±5°C, and the transesterification reaction is completed within 30 minutes. Finally, it was transferred to a water bath to stop the reaction.

[0032] After the reaction, discharge gas, pour the mixture in the autoclave into the collector, and wash the autoclave with methanol. The product to be treated was settled for 60 minutes and separated into three layers, the uppermost layer being methanol phase, which was separated. The remaining two layers were separated and distilled at 60-80° C. for 30 minutes, the remainin...

Embodiment 3

[0034] Put 58.1 grams of pretreated waste cooking oil and 51.3 grams of methanol into the autoclave, seal the autoclave and replace the air in the autoclave with an inert gas, and add 32 grams of co-solvent propane. The pressure and temperature of the reactor are monitored in real time by instruments. The autoclave is heated by an external heater, and the voltage is adjusted to reach 285°C within 30 minutes, controlled at ±5°C, and the transesterification reaction is completed within 30 minutes. Finally, it was transferred to a water bath to stop the reaction.

[0035] After the reaction, discharge gas, pour the mixture in the autoclave into the collector, and wash the autoclave with methanol. The product to be treated was settled for 60 minutes and separated into three layers, the uppermost layer being methanol phase, which was separated. The remaining two layers were separated and distilled at 60-80° C. for 30 minutes, the remaining methanol was distilled off, and the mass...

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Abstract

A process for preparing biologic diesel oil from vegetable oil features that the raw vegetable oil, micromolecular alcohol and cosolvent take part in supercritical ester exchange reaction to convert the glyceride of fatty acid to micro-molecular alkoxide of fatty acid, that is just the biologic disel oil. Its advantages are high reaction speed and no pollution.

Description

(1) Technical field [0001] The invention relates to the technical fields of environmental protection and renewable energy. Specifically, it refers to a method for producing biodiesel through transesterification of vegetable oil under supercritical conditions. (2) Background technology [0002] At present, biodiesel is mainly produced by catalyzing the transesterification reaction of animal and vegetable oils and some short-chain alcohols (methanol, ethanol, etc.) in the presence of a catalyst. Depending on the catalyst used, catalytic methods mainly include chemical catalysis and enzymatic catalysis. [0003] The chemical catalysis method uses acid or alkali catalysts. Although the reaction conditions are mild, there are some shortcomings that cannot be eliminated by themselves: such as complex process, many post-processing procedures, large loss, high cost, acid and alkali in the production process severely corrode the equipment and affect product quality. , easy to cause...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/10Y02P30/20
Inventor 曹维良韩恒文张敬畅
Owner BEIJING UNIV OF CHEM TECH
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