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Method of preparing biological diesel oil containing side chain fatty acid ester

A branched-chain fatty acid ester and biodiesel technology, which is applied in the field of biodiesel preparation, can solve problems such as inappropriateness, impact on product quality, and high price, and achieve the goals of reducing difficulty and cost, improving low-temperature fluidity, and increasing calorific value Effect

Inactive Publication Date: 2007-10-24
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent only provides the production method of fatty acid isopropyl ester, and adopts higher temperature 140~160 ℃ in order to reach the second step of high yield, and higher pressure 0.5~0.6MPa, in this case if use Vegetable oils containing more unsaturated fatty acids are easily oxidized by concentrated sulfuric acid and affect product quality
Moreover, the price of isopropanol is higher than that of methanol. It is not suitable to use isopropanol to prepare isopropyl ester as fuel.

Method used

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  • Method of preparing biological diesel oil containing side chain fatty acid ester
  • Method of preparing biological diesel oil containing side chain fatty acid ester
  • Method of preparing biological diesel oil containing side chain fatty acid ester

Examples

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Effect test

Embodiment 1

[0018] Mix natural oil, frying waste oil or waste oil with methanol and a branched chain alcohol, add a catalyst at a temperature of 40-100°C, and react for 20-180 minutes to obtain a fatty acid ester with a branched chain. A biodiesel product with excellent low temperature flow properties. Wherein the branched chain alcohol is a primary alcohol or a secondary alcohol, the number of carbon atoms in the alkyl group is between 3 and 7, the boiling point is below 155°C, and there is no branch on the α carbon atom of the secondary alcohol; the catalyst can be (strong acid such as sulfuric acid and phosphoric acid ) or strong bases (such as metal hydroxides and alkoxides of potassium and sodium). The molar ratio of methanol to oil is 1:1 to 6:1, the molar ratio of branched alcohol to oil is 3:1 to 25:1, and the amount of catalyst accounts for 0.3% to 5% of the weight of oil. The product is distilled under normal pressure or reduced pressure (vacuum degree 0.1MPa), and the unreacte...

Embodiment 2

[0022] Take 100g of soybean oil with an acid value of 0.5 and a water content of 0.2%, add 5ml of methanol, 150ml of isopropanol and 1g of KOH into a 500ml three-neck flask, heat to 70-80°C, react for 1 hour, and distill off the unreacted alcohol under reduced pressure to obtain biological Diesel oil 103.5g, the product is analyzed by GC-MAS, and the relative content of isopropyl ester is 49.8%. Its kinematic viscosity at 40°C is 4.3mm 2 / s, the condensation point is -10°C, and the cold filter point is -7.5°C. The product is added with methanol, and it is found that it can dissolve about 23.5% of methanol at most, and a certain amount of methanol can be added to the product as a fuel.

Embodiment 3

[0024] Take 100g of soybean oil with an acid value of 0.5 and a water content of 0.2%, add 28ml of methanol, 26ml of isopropanol and 1g of KOH into a 500ml three-necked flask, heat to 70-80°C, react for 20 minutes, and distill off unreacted alcohol under reduced pressure to obtain 96g of biodiesel, the product was analyzed by GC-MAS, and the relative content of isopropyl ester was 9.8%. Its kinematic viscosity at 40°C is 4.3mm 2 / s, the condensation point is -6°C, and the cold filter point is -5°C.

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Abstract

The invention discloses a method preparing for a biological diesel with the branched chain fatty acid ester, which comprises the following steps: mixing the natural grease, the frying scavenge oil or the trench oil with carbinol, alkyl(the range of carbon atomicity is 3-7), the carbinol type branched chain alcohol(the boiling point is under 155Deg. C) or no branched chain carbinol type branched chain alcohol on alpha-carbon atom; adding the accelerant preparing for the biological diesel( the mole ratio of the carbinol and the grease is 1-6:1; the mole ratio of the branched chain alcohol and the grease is 3-20:1; the accelerant consumption of the esterifying reaction is 0. 3%-5% grease weight); reacting 20-90min at 40Deg. C-100Deg. C; getting the product A; distilling the product A; getting the upper layer biological diesel and the lower layer glycerin after stratifying the rest product in the knockout drum. The invention changes the low temperature floating property of the product, which improves the caloric value.

Description

1. Technical field [0001] The invention belongs to a method for preparing biodiesel, in particular to a method for preparing biodiesel containing branched chain fatty acid ester. 2. Background technology [0002] Biodiesel, as a renewable energy source, is getting more and more attention today when oil is about to run out and people are increasingly concerned about the global environment. Biodiesel is generally prepared by the alcoholysis reaction of oil and alcohol. At present, the most research is the fatty acid methyl ester (FME) prepared by methanol, mainly because methanol has a high polarity and a fast reaction speed, and the price is cheap. The performance of biodiesel prepared from methanol and oil is close to that of petrochemical diesel, and its environmental performance is outstanding, but its low temperature performance is not satisfactory, and its calorific value is slightly lower than that of petrochemical diesel. The methods to improve the low-temperature per...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 蒋剑春孟中磊聂小安李翔宇周晶
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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