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Method for preparing biological diesel fuel

A technology for vegetable oil and distillate, applied in the field of esterification to produce biodiesel, can solve the problems of large loss of fatty acid methyl ester, poor effect, increased cost, etc., and achieve the effects of cost reduction, high yield, and wide source.

Inactive Publication Date: 2007-05-23
THE CHINESE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, not only the cost is increased, but also the loss of fatty acid methyl ester is large, and the effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Mix 130g methanol, 7g concentrated sulfuric acid (98%) with 100g physical refining deodorization distillate (peanut, free fatty acid 85%, glyceride 10%, phytosterol 1.3%), react at 75 degrees Celsius for 30 minutes, and the solution is separated . Separation obtains the lower liquid layer, and at a feed rate of 1 milliliter / min, a rotating disc rotating speed of 10-20 rev / min, and a distillation temperature of 140° C., the reaction mixture is molecularly distilled to obtain a fatty acid methyl ester with a purity of 98.6%. The rate is 86.1%. According to the biodiesel inspection method of American ASTM D6751, the physical and chemical properties of the obtained fatty acid methyl esters were tested, and the results are shown in Table 2.

[0068] Subsequently, the molecular distillation residue obtained was added to 350 mL of a mixed solvent of methanol and acetone (8:2), and stood at minus 20 degrees Celsius for 24 hours to precipitate phytosterol crystals. Subsequentl...

Embodiment 2

[0070] At room temperature, add 100 mL of 10 M potassium hydroxide and 200 g of methanol to 100 g of physically refined deodorized distillate (canola, free fatty acid 88%, glyceride 5.5%, phytosterol 2.3%), and react for 10 minutes. 200 mL of hexane was added to the reaction mixture to extract unsaponifiables twice. After separating the hexane layer, the soap solution was centrifuged to separate layers to obtain an upper soap layer and a lower water layer. The soap layer was separated, 34 mL of 25% sulfuric acid was added, and the upper fatty acid layer was separated. Subsequently, 130 g of methanol and 7 g of concentrated sulfuric acid (98%) were added, and reacted at 75° C. for 30 minutes to obtain the upper fatty acid methyl ester layer. 87.9 g of fatty acid methyl esters with a purity of 99.6% were isolated, with a total yield of 90%.

[0071] The hexane extract was distilled at 45°C to recover hexane, and the residue was added to 350mL of a mixed solvent of methanol and...

Embodiment 3

[0073] 150g of urea was dissolved in 450mL of methanol, and then injected into 100g of physical refining deodorization distillate (soybean, free fatty acid 80%, glyceride 9.5%, phytosterol 1.8%), and stirred at 65 degrees Celsius for 30 minutes. The reaction mixture was then left to stand at -20°C for three hours, and urea-fatty acid complex crystals were precipitated. Filter and wash the crystals with 200 mL of hexane. Inject 50mL of water into the filtrate, and the filtrate is layered. The upper organic layer was separated and hexane was recovered by distillation at 45°C. The residue was added to 350 mL of a mixed solvent of methanol and acetone (8:2), and stood at -20°C for 24 hours. The precipitated phytosterol crystals are isolated, with a purity of 95.5% and a yield of 73%.

[0074] Dissolve the urea-fatty acid crystals with 600 mL of hexane and 75% methanol mixture (1:2), and let stand at room temperature to separate the layers. The lower layer is a diluted methanol ...

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Abstract

The invention disclosed a way to produce biological diesel oil which contains high pure fatty acid methyl ester. The material of the way is the physically refined and deodorized distillate of the side products in vegetable oil refining. The way includes the following steps: a) make the mentioned distillate react with methanol at 65-85DEG C with acid catalyst; b) separate the fatty acid ester from the mixed reacting products. The way to treat the physically refined and deodorized distillate is also disclosed in the invention which includes esterizing the free fatty acid in the distillate to get the fatty acid ester and extracting the phytocholesterol from the residue. The invention uses the industry by-product as the material to produce biological diesel oil and phytocholesterol so it has increased the cost efficiency.

Description

technical field [0001] The invention relates to a method for producing biodiesel by using vegetable oil refining by-products as raw materials, in particular to a method for producing biodiesel by esterification using physical refining deodorized distillates as raw materials. Background technique [0002] Due to the increasing scarcity of oil resources, resulting in rising global oil prices, there is an urgent need for alternative renewable energy sources. Biodiesel is one of the newly developed alternative energy sources. Compared with petrochemical diesel, it has many advantages, such as biodegradability, low toxicity, pollution-free, low pollutant emissions, etc., which is beneficial to environmental health. [0003] The main chemical components of biodiesel are fatty acid methyl esters (methyl esters of fatty acids, FAMEs). At present, biodiesel production mainly uses vegetable oil as raw material, and a few include animal fat, such as Chinese patent application No. 9881...

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 赵绍惠黄耀光
Owner THE CHINESE UNIVERSITY OF HONG KONG
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