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Method for preparing biodiesel from waste oil

A waste oil and biodiesel technology, applied in the field of oleochemical industry, can solve the problems of high organic content in glycerol esterification wastewater, difficulty in separating biodiesel and glycerin, and reduce the yield of biodiesel and glycerin, so as to avoid the generation of solid waste , Reduce the generation of saponified matter, the effect of high yield

Active Publication Date: 2022-04-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the actual biodiesel production process, in the glycerol esterification reaction section, higher glycerol esterification reaction temperature (generally 220-240°C) will cause problems such as oil evaporation loss, oil polymerization, glycerin polymerization, etc., resulting in biodiesel Low product yield, high organic matter content in glycerol esterification wastewater, and low glycerin recovery rate; in addition, the use of KOH or NaOH homogeneous alkali catalysts is easy to undergo saponification reaction with residual fatty acids, resulting in difficulty in separating biodiesel from glycerin and reducing Yield of biodiesel and glycerin, increase of asphalt yield, difficulty in catalyst regeneration, etc.

Method used

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  • Method for preparing biodiesel from waste oil
  • Method for preparing biodiesel from waste oil
  • Method for preparing biodiesel from waste oil

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The biodiesel raw material used in Example 1 is acidified soybean oil (acid value 70 mgKOH / g), and the content distribution of fatty acid methyl esters is shown in Table 1.

[0025] Table 1. Contents of fatty acid methyl esters in biodiesel prepared from acidified soybean oil

[0026]

[0027]

[0028] The preparation process of the zinc oxide composite catalyst used in the present embodiment 1 is as follows:

[0029] The mass of raw material zinc oxide is 7.8g, oleic acid is 380g, and glycerin mass is 161g (the molar ratio of glycerol to fatty acid is 1.3:1). After mixing, react at a temperature of 150°C for 2 hours. After the reaction, 10.2g of zinc oxide composite is obtained by filtration. Catalyst (wet weight) for biodiesel production from acidified soybean oil.

[0030] The technical process of preparing biodiesel in this embodiment is as follows: figure 1 As shown, the process for preparing biodiesel includes the following processes:

[0031] 1) Glycerol...

Embodiment 2

[0044] The biodiesel raw material used in Example 2 is palmitic acid oil (acid value 110mgKOH / g), and its fatty acid methyl ester content distribution is shown in Table 4.

[0045] Table 4. Contents of each fatty acid methyl ester in biodiesel prepared from palmitic acid oil

[0046] Element C 12:0

C 14:0

C 16:0

C 18:0

C 18:1

C 18:2

mass fraction% 0.20 1.15 43.10 4.50 39.55 11.5

[0047] The preparation process of the zinc oxide composite catalyst used in present embodiment 2 is as follows:

[0048] The mass of raw material zinc oxide is 3.8g, lauric acid is 150g, and glycerin mass is 82.8g (the molar ratio of glycerol to fatty acid is 1.2:1). After mixing, react at a temperature of 170°C for 2 hours. After the reaction, 5g of zinc oxide compound is obtained by filtration. Catalyst (wet weight) for the production of biodiesel from palmitated oil.

[0049] The technical process of preparing biodiesel in this embodiment is as fo...

Embodiment 3

[0064] The biodiesel raw material used in Example 3 is palmitic acid oil (acid value 133mgKOH / g), and its content distribution of fatty acid methyl ester is shown in Table 7.

[0065] Table 7. Contents of each fatty acid methyl ester in biodiesel prepared from palmitic acid oil

[0066] 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 43.35 9.29

[0067] The preparation process of the zinc acetate composite catalyst used in present embodiment 3 is as follows:

[0068] The quality of raw material solid zinc acetate is 2.6g, oleic acid 200g, glycerin quality is 120g (glycerol and fatty acid molar ratio is 1.85:1), after mixing, it is reacted at 190 DEG C for 2h, obtains 5g zinc acetate composite catalyst through filtration (wet Weight), for the preparation of biodiesel from palmitated oil (AV=133mgKOH / g).

[0069] The technical process of preparing biodiesel in this embodiment is as follows: ...

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Abstract

The invention discloses a method for preparing biodiesel from waste grease. The method comprises the following steps: carrying out low-temperature glyceride esterification reaction, transesterification reaction, dealcoholization, glycerol sedimentation and methyl ester rectification on the raw material waste grease to obtain BD100 biodiesel; wherein the low-temperature glyceride esterification reaction procedure and the ester exchange reaction procedure both adopt a composite zinc catalyst, and the composite zinc catalyst can be directly recovered through settling separation; wherein the composite zinc catalyst is obtained by taking a zinc-containing compound, fatty acid and glycerol as reaction raw materials, reacting and then filtering. On the basis of the acid-base homologous active center of zinc, integrated catalysis of glycerol esterification and ester exchange reaction processes is realized, and the method has the characteristics of low raw material requirement, wide application range, high product yield, easiness in glycerol recovery, no generation of solid waste, recyclability and reusability of the catalyst and the like, and is suitable for industrial production. By adopting the method disclosed by the invention, the BD100 biodiesel can be economically, green, efficiently and stably produced.

Description

technical field [0001] The invention belongs to the technical field of oleochemicals, and in particular relates to a method for preparing biodiesel from waste oil. Background technique [0002] Biodiesel is an important green energy and chemical raw material because of its advantages of non-polluting, biodegradable, and wide source of raw materials. Waste oil is one of the important raw materials of current biodiesel enterprises, but the raw materials contain a large amount of free fatty acids, which must be treated to reduce acidity, and then use alkaline catalysts to catalyze transesterification to obtain biodiesel. At present, using waste oil as raw material, concentrated H 2 SO 4 The catalytic esterification method is combined with the KOH (or NaOH) catalytic transesterification method. This method has common problems such as sulfuric acid wastewater, serious equipment corrosion, incomplete acid reduction, and low yield of biodiesel products. [0003] The glycerol est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/06C11C3/10B01J31/26B01J31/40C01B3/32C07C29/80C07C31/22C10L1/02C11B3/00
CPCC11C3/06C11C3/10C11B3/001C10L1/02B01J31/26B01J31/4015B01J31/4092C01B3/32C07C29/80C07C31/22Y02P20/584Y02E50/10
Inventor 聂勇梁晓江费浩天郑聪文解庆龙吴振宇于尚志计建炳
Owner ZHEJIANG UNIV OF TECH
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