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Preparation method of biodiesel

A technology for biodiesel and glycerol, applied in the field of oleochemical industry, can solve the problems of difficulty in separating biodiesel and glycerol, reducing the yield of biodiesel and glycerol, difficulty in catalyst regeneration, etc., and achieves the regeneration and reuse of catalyst raw material sources and the source of catalyst raw materials. Wide range of effects to reduce saponification

Active Publication Date: 2020-08-07
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the actual biodiesel production process, a small amount of free fatty acids (acid value 1.0 mgKOH / g is equivalent to 0.5% of residual fatty acid content) remains after acidified raw material oil is deacidified by glycerol esterification method. During the reaction, this part of free fatty acid is very easy to undergo saponification reaction with KOH or NaOH catalyst, resulting in difficulties in the separation of biodiesel and glycerin, reduced yield of biodiesel and glycerol, increased asphalt yield, and difficulty in catalyst regeneration.

Method used

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  • Preparation method of biodiesel
  • Preparation method of biodiesel

Examples

Experimental program
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Embodiment 1

[0020] The biodiesel raw material used in Example 1 is palmitic acid oil (acid value 160mgKOH / g), and its content distribution of fatty acid methyl ester is shown in Table 1.

[0021] Table 1 Content table of each fatty acid methyl ester in biodiesel prepared from palmitic acid oil

[0022] Element C 12:0

C 14:0

C 16:0

C 18:0

C 18:1

C 18:2

Mass fraction % 0.15 1.08 41.03 5.10 43.55 9.09

[0023] The technical process for preparing biodiesel in this embodiment is as follows: figure 1 As shown, the process for preparing biodiesel includes the following processes:

[0024] 1) Glycerol esterification reaction: After the raw palmitic acid oil is preheated to 240°C, glycerin is added for glycerin esterification reaction (fresh glycerin is used for the first production, and recycled glycerin can be used in the future), and the glycerol esterification temperature is controlled at 240°C, reaction time 2 hours;

[0025] 2) Transesterif...

Embodiment 2

[0037] Embodiment 2 compares the effect of calcium glycerol catalyst and traditional KOH catalyst in transesterification reaction

[0038] The technology of the present invention: the 3.4g calcium oxide regenerated in Example 1 is used as raw material to prepare calcium glycerol, and the preparation temperature is 40° C. (the remaining conditions of catalyst preparation are with reference to Example 1). The prepared calcium glycerol catalyst was dissolved in methanol at 55° C. to form a calcium glycerol methanol solution. Get 150 g of the calcium glycerol methanol solution prepared in Example 2, and 500 g of the feed solution after the glycerol esterification reaction in Example 1, carry out transesterification at 60°C (the amount of calcium glycerol is 1.0 wt% of the oil weight), and the reaction time is 3h . After the transesterification reaction was finished, through the processes of dealcoholization, sedimentation, glycerin rectification and methyl ester rectification, th...

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Abstract

The invention discloses a preparation method of biodiesel. The method comprises the following steps: carrying out a glyceridation reaction, a transesterification reaction, dealcoholization, sedimentation and methyl ester rectification on raw material acid oil to obtain BD100 biodiesel, wherein calcium glyceroxide is used as a catalyst in the transesterification process; a calcium oxide solid formsa glycerol-calcium methanol solution through processes of catalyst preparation, filtration and dissolution, the glycerol-calcium methanol solution is used for catalyzing the transesterification reaction process of the acid oil, regeneration of calcium oxide is further realized through processes of dealcoholization, sedimentation, glycerol rectification and water vapor conversion, and the regenerated calcium oxide is reused for a catalyst preparation process. The method has the characteristics of low raw material requirement, wide application range, high product yield, no solid waste, wide catalyst raw material source, recyclability and the like, and is suitable for industrial production. By adopting the method disclosed by the invention, the BD100 biodiesel can be economically, greenly, efficiently and stably produced.

Description

technical field [0001] The invention belongs to the technical field of oil chemical industry, and in particular relates to a preparation method of biodiesel. Background technique [0002] Biodiesel is a kind of green energy with broad application prospects because of its advantages such as no pollution, biodegradability, and good combustion performance. Acidified oil is one of the important raw materials for current biodiesel enterprises. It usually contains a large amount of free fatty acids. It needs to be acid-reduced first, and then use alkali catalysis to prepare biodiesel. At present, the industrial production of biodiesel generally uses concentrated H 2 SO 4 The catalytic esterification method is combined with the KOH (or NaOH) catalytic transesterification method. This two-step method still has problems such as sulfuric acid wastewater, high acid value of esterification products, serious saponification side reactions, and low yield of biodiesel products. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/06C11C3/10C11B3/00C11B3/12C11B3/16
CPCC11C3/06C11C3/10C11B3/001C11B3/12C11B3/16Y02E50/10
Inventor 聂勇梁晓江费彦仁解庆龙吴振宇于凤文卢美贞计建炳
Owner ZHEJIANG UNIV OF TECH
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