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Method for preparing biodiesel by ultrasonic and microwave combination

A biodiesel and ultrasonic technology, which is applied in the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, etc., can solve the problems of low reaction conversion rate, inability to be widely used, and long reaction time, and achieve novel production technology and production cost. Low, fast response effect

Inactive Publication Date: 2007-03-28
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, domestic patent applications for biodiesel preparation have shortcomings such as long reaction time, low reaction conversion rate, high energy consumption, and high production cost, which cannot be widely used in commercial production.

Method used

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  • Method for preparing biodiesel by ultrasonic and microwave combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1 mol of deacidified and dehydrated soybean oil, 6 mol of methanol, and 2% of calcium oxide catalyst into a 1.5-liter flask, and emulsify in an ultrasonic reactor at 35°C and 50 kHz for 2 minutes. After the emulsification reaction, transfer the mixture into a microwave reactor for transesterification reaction, control the reaction temperature at 45°C, heat and reflux for 3 minutes, filter the mixed solution while hot after the reaction, and recycle the obtained solid catalyst after activation treatment. The liquid is distilled to recover excess methanol.

[0021] Then adopt the method of centrifugation to separate crude biodiesel and glycerin. The crude biodiesel is neutralized, washed with water, dried, and continuously distilled under reduced pressure at 220-250°C to obtain high-purity biodiesel. The fatty acid methyl ester content of biodiesel is 98.3% through chromatographic detection.

Embodiment 2

[0023] Add 1 mol of deacidified and dehydrated rapeseed oil, 8 mol of methanol, and 3% barium oxide catalyst into a 1.5-liter flask, and emulsify in an ultrasonic reactor at 40°C and 100 kHz for 3 minutes. After the emulsification reaction, the mixture was transferred to a microwave reactor for transesterification reaction, the reaction temperature was controlled at 65°C, and heated to reflux for 7 minutes. After the reaction was completed, the mixed solution was filtered while it was hot, and the obtained solid catalyst was activated and then recycled. The liquid is distilled to recover excess methanol.

[0024] Then adopt the method of centrifugation to separate crude biodiesel and glycerin. The crude biodiesel is neutralized, washed with water, dried, and continuously distilled under reduced pressure at 220-250°C to obtain high-purity biodiesel. The fatty acid methyl ester content of biodiesel is 97.3% through chromatographic detection.

Embodiment 3

[0026] Add 1 mol of recovered waste oil, 12 mol of methanol and 2.5% catalyst zinc oxide into a 1.5-liter flask, and emulsify in an ultrasonic reactor at 45°C and 150kHz for 2 minutes. After the emulsification reaction, the mixture was transferred to a microwave reactor for transesterification reaction, the reaction temperature was controlled at 65°C, and heated to reflux for 8 minutes. After the reaction was completed, the mixed solution was filtered while it was hot, and the obtained solid catalyst was activated and then recycled. The liquid is distilled to recover excess methanol.

[0027] Then adopt the method of centrifugation to separate crude biodiesel and glycerin. The crude biodiesel is neutralized, washed with water, dried, and continuously distilled under reduced pressure at 220-250°C to obtain high-purity biodiesel. The fatty acid methyl ester content of biodiesel is 95.3% through chromatographic detection.

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Abstract

The invention relates to the method used ultrasonic wave and micro wave to prepare biological diesel oil. It includes the following steps: mixing the raw oil processed by depickling and dehydrating, methanol, and solid Lewis base catalyst; sending the mixture into ultrasonic wave emulsification reactor to process emulsification dispersion; then sending the mixture into micro wave reactor to process ester exchange; filtering the mixed liquor; processing centrifugal separation to divide the biological diesel oil from the glycerol; processing neutralizing, washing by water, drying, continuous vacuum distillation to gain high qualitative biological diesel oil. The invention is the method which uses animal and vegetable oils as raw material, adopts ultrasonic wave intensifying emulsifying dispersing technique and micro wave auxiliary energy providing to fast fit for commercialization product, reduce product cost and environment pollution.

Description

Technical field: [0001] The invention relates to a method for preparing biodiesel by combining ultrasonic waves and microwaves, which can greatly improve production efficiency and reduce production costs, and particularly relates to production using natural vegetable oils, animal fats, recovered waste oils or their mixtures as raw materials A method for preparing biodiesel that can replace petroleum diesel products. Background technique [0002] In recent years, with the decrease of fossil energy and the rapid increase of human energy demand, countries all over the world are accelerating the development of new alternative energy. Bioenergy, including fuel alcohol, biohydrogen and biodiesel, has attracted people's attention due to its good renewable properties. Especially biodiesel, its combustion performance is no less than that of petroleum diesel, and it can be directly used in diesel engines, etc., and is considered to be the best substitute for petroleum diesel. Biodie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 高锦明张增强张鞍灵杨胜祥李满林王栩
Owner NORTHWEST A & F UNIV
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