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One-step method for preparing biodiesel by low-acid catalytic fatty or fatty acid

A biodiesel and fatty acid technology, applied in the direction of fatty acid esterification, biological raw materials, biofuels, etc., can solve the problems of high cost of enzyme preparations, poor reusability of catalysts, low conversion rate, etc. The effect of high reaction time and product conversion rate

Active Publication Date: 2011-04-13
无锡中粮工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most manufacturers use the traditional two-step method to produce biodiesel, which is pre-esterification and then alkali-catalyzed reaction. The process reaction is not only affected by the amount of methanol and catalyst, but also has high quality requirements for raw material treatment, which is affected by raw material quality, Environmental pollution, production costs and other impacts are not conducive to promotion and popularization in my country
Solid catalysts are currently being studied at home and abroad, but generally speaking, the conversion rate is low, the reusability of the catalyst is poor, the price is high, and there is still a long distance from industrial production and application.
Although enzymatic catalysis has mild conditions, the disadvantages of expensive enzyme preparations and relatively low conversion rates limit its application in industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: add 100g jatropha oil (acid value 3.8) in low-pressure reactor, 2g vitriol oil, 100g methyl alcohol, sulfuric acid is first dissolved in methanol and then joins in reactor, reaction pressure 0.2~0.3MPa, reaction temperature 85°C, reaction time 18h. After the reaction, the methanol is recovered by vacuum through the methanol distillation tower, and then the product is left to stand for 2 hours and separated into layers. The upper layer is mainly fatty acid methyl ester, and the lower layer is mainly glycerin and sulfuric acid. Wash the upper product with about 30mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion rate of methyl ester measured in glycerol was 94.4%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, the vacuum degree is higher than -0.1MPa, and the fraction between 170°C and 190°C is taken as the final product of biodiesel.

Embodiment 2

[0014] Embodiment 2: add 100g jatropha oil (acid value 3.8), 1.5g concentrated sulfuric acid, 80g methyl alcohol in the low-pressure reaction kettle, sulfuric acid is first slowly added dropwise in the methanol and then joins in the reaction kettle, reaction pressure 0.2~0.3MPa , the reaction temperature was 95°C, and the reaction time was 19h. After the reaction, the methanol is recovered by vacuum through the methanol distillation tower, and then the reaction product is left to stand for 2 hours and separated into layers. The upper layer is mainly fatty acid methyl ester, and the lower layer is mainly glycerin and sulfuric acid. Wash the upper product with about 30mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion rate of methyl ester measured from glycerol was 95.3%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, and the fraction between 170° C. and 190° C. is taken under the...

Embodiment 3

[0015] Embodiment 3: add 100g jatropha oil (acid value 3.8) in low-pressure reactor, 1g vitriol oil, 100g methyl alcohol, sulfuric acid is first dissolved in methanol, then sulfuric acid methanol solution is joined in reactor, reaction pressure 0.2~ 0.3MPa, reaction temperature 95°C, reaction time 20h. After the reaction, the excess methanol in the reaction product was recovered by vacuum through the methanol distillation tower, and then the remaining mixed product was left to stand for 2 hours. The upper layer was the required fatty acid methyl ester, and the lower layer was mainly glycerin and sulfuric acid phase. Wash the upper product with about 30 mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion of the methyl ester was determined to be 98.7%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, the vacuum degree is higher than -0.1MPa, and the fraction between 170°C and 190°C i...

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PUM

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Abstract

The invention relates to a preparation method of biodiesel from low acid catalyzing lard or fatty acid, belonging to technical field of biodiesel preparation method from lard or fatty acid in separate sources and classes. The preparation method utilizes the lard or fatty acid in separate sources and classes to further react with methanol under low acid catalysis to obtain methyl fatty acid ester,namely the biodiesel. The dosage of the catalyst sulfate is only 1 to 2 percent of the lard or fatty acid. The preparation method of biodiesel from low acid catalyzing lard or fatty acid has the advantages of wide range of the materials, low additive quantity of the acid, short reaction time, low energy consumption, high conversion rate of the products, simple technique, low pollution of the three wastes and low production cost. Further, the biodiesel adopts the reaction under pressure.

Description

technical field [0001] The invention discloses a method for one-step preparation of biodiesel from oil or fatty acid with low-acid catalysis, which belongs to the technical field of preparation of biodiesel from various sources and types of oil or fatty acid. Specifically, different sources and types of oils or fatty acids are simultaneously esterified and transesterified under low-acid and low-pressure conditions to prepare biodiesel in one step. Background technique [0002] Petroleum energy has become a bottleneck restricting my country's economic development. Especially in recent years, the sharp rise in international oil prices has had an increasing impact on China's economy. Petroleum, as a non-renewable energy source with limited exploitation, can no longer meet the growing demand of people, which leads to the continuous rise of the price of refined oil. In the context of soaring international crude oil prices, countries all over the world have turned their attention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/04C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 姚专栾建美郭善辉陈志华朱小兵秦卫国施肖峰
Owner 无锡中粮工程科技有限公司
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