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Method for preparing fatty acid methyl ester and glycerol from kitchen waste oil by utilizing acid-base two-step method

A technology of fatty acid methyl ester and waste oil, which is applied in the direction of fatty acid esterification, alcoholysis preparation, biofuel, etc., can solve the problems of low recovery rate of glycerin and unusable products, etc., and achieves simple preparation method, low energy consumption and high efficiency. less effect

Inactive Publication Date: 2011-04-20
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Application Information

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Problems solved by technology

[0006] Moreover, the recovery rate of glycerin produced during the production of fatty acid methyl esters by acid and alkali methods is generally low and cannot be utilized as a product.

Method used

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  • Method for preparing fatty acid methyl ester and glycerol from kitchen waste oil by utilizing acid-base two-step method
  • Method for preparing fatty acid methyl ester and glycerol from kitchen waste oil by utilizing acid-base two-step method

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Embodiment Construction

[0033] Take kitchen waste oil, after precipitation, filtration, water washing, dehydration, decolorization and other pretreatments, add anhydrous methanol and 40% sulfuric acid, the amount of methanol added is alcohol oil ratio 6:1 ~ 9:1, concentrated sulfuric acid is added The amount is acid-oil ratio (1-5):100. Heat to 60-65°C and stir at 200-400r / min for 3 hours. Leave to stand for stratification, the lower layer is a glycerin-water mixture, and the upper layer obtains an intermediate product-fatty acid methyl ester (biodiesel), oil, and a small amount of acid catalyst mixture; separate the mixture of fatty acid methyl ester and oil, and add a quantitative amount of alkali metal carbonate solution, wash and separate, and remove water at 105±5°C. Then, add anhydrous methanol and 5% sodium carbonate solution to the fatty acid methyl ester and oil mixture after washing according to the ratio of alcohol to oil 5:1, and heat at 50°C for 3 hours; Water mixture, the upper layer ...

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Abstract

The invention relates to an acid-base two-step process system which comprises a preprocessing system and is used for preparing fatty acid methyl ester and glycerol from kitchen waste oil. The system comprises a kitchen waste oil preprocessing unit, an acid-base two-step esterlysis reaction unit, a glycerol separation and recovery unit, a rinsing and dehydrating unit and a decoloration filtering unit and the like. The processes are as follows: step I: after impurity removal, dehydration and deodorization are carried out on the kitchen waste oil, 40% concentrated sulfuric acid the weight of which is 1-5% of that of the waste oil is added, absolute methanol is added based on the alcohol-oil ratio of (6:1)-(9:1), heating is carried out until the temperature is 60-65 DEG C, the mixture is stirred for 1-3 hours at a revolving speed of 200-400r / min, and then rinsing separation and dehydration are carried out, thus obtaining the fatty acid methyl ester and crude glycerol; and step II: solid base catalyst the mass percent concentration of which is 0.5-5% is added in the rinsed fatty acid methyl ester mixture, absolute methanol is added based on the alcohol-oil ratio of (3:1)-(6:1), reaction is carried out for 1-3 hours at 20-50 DEG C, and then distillation is carried out under reduced pressure, thus obtaining the fatty acid methyl ester.

Description

technical field [0001] The invention relates to the field of green energy regeneration and utilization, in particular to a method including a pretreatment system and using an acid-base two-step method to prepare fatty acid methyl ester and glycerin from kitchen waste oil. Background technique [0002] Fatty acid methyl ester is not only used as biodiesel, but also as an important raw material in the production of PVC granulation, food packaging materials, leather fatliquor, fatty alcohol and surfactant. Biodiesel, as a green and clean energy that has developed rapidly in European and American countries in recent years, can effectively reduce the emissions of sulfur oxides, heavy metals, particulate matter, HC and CO in combustion exhaust, and is of great significance for energy saving and emission reduction. With the development of industry and the rapid rise of the automobile industry, the demand for biodiesel in the world is increasing year by year. The production of biod...

Claims

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Application Information

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IPC IPC(8): C11C3/10C07C31/22C07C29/128
CPCY02E50/13Y02E50/10
Inventor 任连海
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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