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Method for preparing biodiesel

A biodiesel and seed technology, applied in renewable energy and green fields, can solve the problems of high price of vegetable oil, little research, high cost, etc., to simplify the process, promote rapid progress, and improve production efficiency.

Inactive Publication Date: 2009-09-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the cited patents, high cost refined or semi-refined vegetable oils are used, or waste animal and vegetable oils are used, so the price of vegetable oil is higher than that of the final biodiesel product due to the high cost
[0005] At present, there are not many studies directly using oilseeds as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether: ethanol weight ratio is 80:20), then add 2.5g of concentrated sulfuric acid, and carry out oil extraction and transesterification reaction at 50°C, and the reflux reaction time lasts After 3 hours, stand still and separate to obtain a fatty acid ethyl ester phase and a glycerin-rich phase, wherein the fatty acid ethyl ester phase is distilled to obtain fatty acid ethyl ester (ie biodiesel) and a mixed solvent. The glycerin-rich phase is distilled to obtain glycerin and a mixed solvent, and the resulting mixed solvent can be reused. Wherein the residual residual oil rate is 1.68wt%.

[0020] The prepared biodiesel product was analyzed by GCMS (chromatographic column TR5MS, 30m×0.25mm×0.25μm), and the content of fatty acid ethyl ester determined by internal standard method was 88.7%.

Embodiment 2

[0022] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether: ethanol weight ratio is 50:50), then add 2.5g of concentrated sulfuric acid, and carry out oil leaching and esterification reaction at 65°C, and the reflux reaction time lasts After 3 hours, filter, stand still, and separate to obtain a fatty acid ethyl ester-rich phase and a glycerin-rich phase, wherein the fatty acid ethyl ester-rich phase is distilled to obtain fatty acid ethyl ester (ie, biodiesel) and a mixed solvent. The glycerin-rich phase is distilled to obtain glycerin and a mixed solvent, and the resulting mixed solvent can be reused. Wherein the residue residual oil rate is 1.25wt%.

[0023] The prepared biodiesel product was analyzed by GCMS, and the content of fatty acid ethyl ester determined by internal standard method was 91.9%.

Embodiment 3

[0025] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether: ethanol weight ratio is 50:50), then add 2.5g of concentrated sulfuric acid, and carry out oil extraction and esterification reaction at 80°C, and the reflux reaction time lasts After 3 hours, filter, stand still, and separate to obtain a fatty acid ethyl ester-rich phase and a glycerin-rich phase, wherein the fatty acid ethyl ester-rich phase is distilled to obtain fatty acid ethyl ester (ie, biodiesel) and a mixed solvent. The glycerin-rich phase is distilled to obtain glycerin and a mixed solvent, and the resulting mixed solvent can be reused. Wherein the residue residual oil rate is 1.28wt%.

[0026] The prepared biodiesel product was analyzed by GCMS, and the content of fatty acid ethyl ester determined by internal standard method was 94.2%.

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PUM

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Abstract

The invention discloses a method for preparing biodiesel, which comprises the steps of mixing oil seeds, a component solvent and a catalyst to lead oil extraction and ester exchange reaction to conduct synchronously; then standing and separating to obtain fatty acid alkyl rich monoester phase; and then distilling to obtain the biodiesel. The method directly takes the oil seeds as the raw material and sulphuric acid as the catalyst, and the process does not need to strictly restrict water content, and the oil extraction and ester exchange reaction are conducted synchronously with mutual promotion, thus simplifying the process, lowering the cost and improving the production efficiency.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, which belongs to the technical field of green and renewable energy. Background technique [0002] The increasing depletion of petroleum resources and the increasing awareness of environmental protection have prompted people to develop alternatives to petroleum fuels. Biodiesel is fatty acid monoalkyl ester, which is a renewable energy produced from vegetable or animal oils and fats, and can be used as a substitute for petroleum diesel. [0003] Biodiesel is usually produced by transesterification reaction of vegetable oil (such as soybean oil, etc.) or edible oil processing waste with lower alcohols under the catalysis of acidic or basic catalysts. The basic catalysts used are generally NaOH, KOH and solid base, etc., acidic catalysts usually include sulfuric acid, hydrochloric acid, organic sulfonic acid and solid super acid. In the process of alkali-catalyzed transesterification, the basic ...

Claims

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Application Information

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IPC IPC(8): C10G3/00C11B1/00C11B3/10
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王少军凌凤香张喜文吴洪新钱迈原
Owner CHINA PETROLEUM & CHEM CORP
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