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Method for producing biodiesel

A technology of biodiesel and vegetable oil, applied in biofuel, fatty acid production, petroleum industry, etc., can solve the problems of high cost and troublesome operation, and achieve the effect of low cost and simple operation

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all need to add additional substances, the cost is high, and the operation is troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 300g of cottonseed oil, 130g of methanol, and 23g of triethylamine into the autoclave, and the reaction temperature is 140°C. Take it out after 5 hours of reaction, steam the remaining methanol, and separate 27g of crude glycerin from the remaining product. The acid value of the ester phase is 3.73mgKOH / g, add 4 g of water to the ester phase, shake and then add 10 g of crude glycerin, shake well, let stand to separate layers, take the upper ester phase and analyze the acid value of 0.21 mgKOH / g after vacuum distillation.

Embodiment 2

[0027] Add 300g of palm oil, 110g of methanol, and 36g of triethylamine into the autoclave, and the reaction temperature is 100°C. Take it out after 5 hours of reaction, steam the remaining methanol, and separate 29g of crude glycerol from the remaining product. The acid value of the ester phase is 1.09mgKOH / g, add 6 g of water to the ester phase, add 15 g of crude glycerin after shaking, shake and shake, let stand to separate layers, take the upper ester phase and analyze the acid value of 0.25 mgKOH / g after vacuum distillation.

Embodiment 3

[0029] Add 500g of palm oil, 133g of methanol, and 51g of triethylamine into the autoclave, and the reaction temperature is 130°C. Take it out after 3 hours of reaction, steam the remaining methanol, and separate 22.4g of crude glycerin from the remaining product. The acid value of the ester phase is 3.27mgKOH / g, add 5g of water to the ester phase, add 20g of crude glycerin after shaking, shake and shake well, let stand to separate layers, take the upper ester phase and analyze the acid value of 0.34mgKOH / g after vacuum distillation.

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PUM

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Abstract

The invention discloses a method for producing biodiesel. The method comprises the following steps: (1) carrying out esterification reaction on animal / plant oil or fat containing fatty acid triglyceride and monohydric alcohol having 1 to 4 carbon atoms under the action of organic alkali catalyst; (2) separating the esterification product obtained in the step (1) to obtain the monohydric alcohol having 1 to 4 carbon atoms, crude glycerine and fatty acid monoester containing the organic alkali catalyst; (3) adding water into the fatty acid monoester containing the organic alkali catalyst obtained by the separation in the step (2), stirring and mixing, wherein the amount of added water is 1 to 2% of the mass of fatty acid monoester containing the organic alkali catalyst, and the mixing temperature is 25 to 100 DEG C; (4) adding the crude glycerine separated in the step (2) in the material in the step (3), stirring, mixing, standing and layering to obtain an ester phase and a glycerine phase, decompressing and distilling the ester phase to obtain a biodiesel product with a qualified acid value, and treating the glycerine phase to obtain fatty acid and glycerine. By the method, the biodiesel with a low acid value can be prepared, and the method has the advantages of simplicity in operation, low cost and the like.

Description

technical field [0001] The invention relates to a method for producing biodiesel, in particular to a method for producing biodiesel with low acid value. Background technique [0002] Fatty acid triglycerides, especially animal and vegetable fats and oils, methyl esters obtained by transesterification with low molecular weight monohydric alcohols, have similar properties to diesel oil obtained from petroleum fractions, and can be used as fuels. The fuel obtained in this way is called biodiesel. [0003] The biodiesel produced by the transesterification reaction of oil has the following advantages: 1) It has excellent environmental protection characteristics. Biodiesel has low sulfur content and does not contain aromatic hydrocarbons that pollute the environment. 2) It has good engine low-temperature starting performance, and the condensation point reaches -20°C without additives. 3) It has good lubricating performance, which can reduce the wear rate of fuel injection pump,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C1/10C10L1/02
CPCC10L1/06C11C1/10C11C3/06Y02E50/10
Inventor 魏晓霞霍稳周陈明李花伊刘野
Owner CHINA PETROLEUM & CHEM CORP