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A pretreatment method for preparing biodiesel from waste oil
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A technology of biodiesel and waste oil
Active Publication Date: 2021-11-19
FOSHAN UNIVERSITY
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Problems solved by technology
However, waste oil has high acid value, colloid, moisture and other impurities, so it is not suitable for direct transesterification to produce biodiesel
In particular, most people use a single tank reaction or a single fixed bed to prepare biodiesel, which limits their processing range of raw materials
Method used
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Examples
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Embodiment 1
[0020] Embodiment 1: the pretreatment of waste oil
[0026] Take 200g of waste oil and place it in a conical flask, add 200mL of petroleum ether (60-90°C), start an electric stirrer at room temperature to fully dissolve it, and then filter through diatomaceous earth under reduced pressure to remove solid insoluble matter. Add 50 mL of water to the waste oil after removing the insoluble matter, heat to reflux for 30 minutes, and remove the water layer by centrifugation or liquid separation. After removing the water layer, the waste oil was dried with anhydrous magnesium su...
Embodiment 2
[0027] Embodiment 2: the pre-esterification of waste oil
[0030] Instruments: thermometer, electric stirrer, water separator, spherical condenser, three-necked flask, electric heating mantle, circulating water type multi-purpose vacuum pump, vacuum rotary evaporator
[0031] 2.2 Pre-esterification method
[0032] Add 100 g of the crude oil obtained in Example 1, 16 mL of methanol and 2 g of concentrated sulfuric acid into a three-necked flask equipped with a thermometer, an electric stirrer, a water separator, and a spherical condenser, and use a constant temperature electric heating mantle to control the reaction temperature to 75 ° C. After reflux for 4 hours, the methanol and the water produced by the reaction were evaporated in vacuo. Then pour the grease into the separatory funnel and wash with water until the washing wat...
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Abstract
The invention discloses a pretreatment method for preparing biodiesel from waste oil. After the waste oil is pretreated by the method, it becomes the raw material crude oil for preparing biodiesel, and can be directly used for the preparation of biodiesel after being pre-esterified, thereby improving the yield and quality of the biodiesel.
Description
technical field [0001] The invention relates to a pretreatment method for preparing biodiesel from waste oil, and belongs to the field of resource recycling science and engineering technology. Background technique [0002] Waste oil refers to all kinds of waste oil and oily waste, including swill oil (in the ditch near hotels and restaurants, the greasy floating matter above the sewage, which is collected and processed briefly. The oil is dark brown, opaque, and has a strong odor. sour and foul odor). Biodiesel is a high-grade fatty acid methyl ester or high-grade fatty acid ethyl ester fuel made from renewable raw materials such as oil crops, wild oil plants and engineered microalgae, as well as renewable raw materials such as animal fats and catering waste oils through transesterification. Biodiesel currently used in countries around the world mainly refers to fatty acid methyl esters obtained by transesterifying animal and vegetable oils with methanol. Using gutter oil ...
Claims
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Application Information
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