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Biodiesel preparation method

A biodiesel and oil technology, applied in the field of oleochemical industry, can solve the problems of complex post-processing, high equipment requirements, and many waste liquids, and achieve the effects of simple recovery and purification, wide applicability of raw materials, and efficient continuous production.

Inactive Publication Date: 2010-11-24
KUNMING UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

At present, the production of biodiesel is mainly based on the chemical transesterification method, but the transesterification method has strict requirements on raw materials, the acid value must be lower than 1.0, and it must not contain water, which limits its application and promotion.
Most of the catalysts used in the preparation of biodiesel are traditional liquid acids and bases, there are many waste liquids, separation is difficult, and the requirements for equipment are high, but at the same time, the products need to be neutralized and washed, which will bring a large amount of industrial wastewater, causing environmental pollution and complex post-treatment. and other shortcomings

Method used

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Embodiment 1

[0013] Embodiment 1: the preparation of jatropha biodiesel

[0014] 1) Continuous transesterification and product refining: Jatropha oil is continuously added to the transesterification reactor 4, and the methanol vapor generated in the methanol gasification device 1 is heated by the heat bath 3 from the gas distribution plate installed at the bottom of the transesterification reactor 4 5 into the reactor equipped with mesoporous solid base catalyst (calcium oxide), under the action of the mesoporous solid base catalyst in the fixed bed 7, methanol vapor and jatropha oil undergo transesterification reaction, and the remaining methanol vapor is reacted The reaction product biodiesel is taken out of the reactor 4 and enters the condenser 8; after temperature control and condensation, the biodiesel is discharged from the bottom of the condenser 8 in liquid form to obtain the product Jatropha oil biodiesel, and methanol is in gas form in the gas circulation pump 2 Under the action...

Embodiment 2

[0020] Embodiment 2: the preparation of rapeseed oil biodiesel

[0021] 1) Continuous transesterification and product refining: rapeseed oil is continuously added to the transesterification reactor 4, and the methanol vapor generated in the methanol gasification device 1 is heated by the heat bath 3 from the gas distribution plate installed at the bottom of the transesterification reactor 4 5 into the reactor equipped with a mesoporous solid base catalyst (barium oxide), under the action of the mesoporous solid base catalyst in the fixed bed 7, methanol vapor and rapeseed oil undergo transesterification, and the remaining methanol vapor The reaction product biodiesel is taken out of the reactor 4 and enters the condenser 8; after temperature control and condensation, the biodiesel is discharged from the bottom of the condenser 8 in liquid form to obtain the product rapeseed oil biodiesel, and methanol is in the form of gas in the gas circulation pump 2 Under the action, return...

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Abstract

The invention relates to a biodiesel preparation method, which comprises that: ester exchange reaction is performed on fat and methanol vapor produced by hot-bath heating in a continuous ester exchange reactor, and the reaction product biodiesel is discharged out of the reactor and enters a condenser along with the methanol vapor remaining after the reaction; and after being subjected to temperature-controlled condensation, the product biodiesel is discharged from the bottom of the condenser in a liquid form. The biodiesel can be timely separated from the reactor to promote the completely positive development of the reaction, and simultaneously the methanol is recycled to reduce energy consumption; in the reaction system, the methanol not only serves as a reagent to participate in the reaction, but also plays a role in stirring; a mesoporous solid catalyst is adopted, so the product is easy to separate, does not need washing with water and is environmentally-friendly, and glycerol is simple to recycle and purify; and the method has the advantages of simple process, wide raw material application and the highly-efficient continuous production of the biodiesel.

Description

technical field [0001] The invention relates to the technical field of oleochemical industry, in particular to a method for preparing biodiesel. Background technique [0002] Biodiesel is a good substitute of petrochemical diesel. Compared with petrochemical diesel, it has excellent environmental protection, better low-temperature engine starting performance and safety performance, good fuel performance and renewable characteristics. At present, the production of biodiesel is mainly based on the chemical transesterification method, but the transesterification method has strict requirements on the raw materials, the acid value must be lower than 1.0, and it must not contain water, which limits its application and promotion. Most of the catalysts used in the preparation of biodiesel are traditional liquid acids and bases, there are many waste liquids, separation is difficult, and the requirements for equipment are high, but at the same time, the products need to be neutralized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/13Y02P30/20Y02E50/10
Inventor 王华苏有勇包桂蓉王督吴桢芬
Owner KUNMING UNIV OF SCI & TECH
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