Method for preparing microbe diesel oil by ionic liquid catalysis

An ionic liquid, catalytic preparation technology, applied in the preparation of liquid hydrocarbon mixtures, biological raw materials, petroleum industry, etc., can solve the problems of non-compliance and high cost of biodiesel, and achieve stable performance, no acid loss, and mild reaction conditions.

Inactive Publication Date: 2009-08-26
青岛生物能源与过程研究所
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Problems solved by technology

However, my country has a large population and relatively scarce arable land, so it needs to import a large amount of edible oil to ensure the supp

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  • Method for preparing microbe diesel oil by ionic liquid catalysis
  • Method for preparing microbe diesel oil by ionic liquid catalysis
  • Method for preparing microbe diesel oil by ionic liquid catalysis

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preparation example Construction

[0032] 1) Preparation process of acid-functionalized ionic liquid: 24.4 parts by mass of 1,3-propane sultone were dissolved in 200 parts by mass of ethyl acetate, heated to 50°C, and 16.4 parts by mass of N-methyl After the addition of imidazole is completed, after 3 hours of heat preservation reaction, filter, wash the filter cake with ethyl acetate, and dry at 100°C for 2 hours to obtain white solid 1-(3-sulfonic acid)propyl-3-methanol Imidazolium salt; get 20.4 parts of quality 1-(3-sulfonic acid group) propyl group-3-methylimidazolium salt, dissolve in 50 parts of quality deionized water, add dropwise the concentrated sulfuric acid (98%) of 9.8 parts of quality , after the dropwise addition, the temperature was raised to 90° C. and kept for 3 hours for reaction. After the reaction was completed, dehydration was performed under reduced pressure to obtain a light yellow viscous liquid 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate.

[0033] 2) Preparation of...

Embodiment 1

[0035] Example 1: Put 7 grams of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazole hydrogen sulfate, 28.2 grams of free fatty acid, and 13.8 grams of ethanol into a reaction flask, stir, Heating, the esterification reaction temperature is 60°C to 120°C. After reacting for 9 hours, the reaction liquid was allowed to stand and separated into layers, the upper layer of the reaction liquid was poured out, and purified by distillation. The conversion rate of free fatty acid was 96.3%.

Embodiment 2

[0036] Example 2: Put 4 grams of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazole hydrogen sulfate, 28.2 grams of free fatty acid, and 9.6 grams of methanol into a reaction flask, stir, Heating, the esterification reaction temperature is 60°C to 80°C. After reacting for 6 hours, the reaction solution was allowed to stand and separated into layers, the upper layer of the reaction solution was poured out, and purified by distillation. The conversion rate of free fatty acid was 92.8%.

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Abstract

The invention relates to a method for preparing microbe diesel oil by ionic liquid catalysis, which comprises the following steps: A) using acid functional ionic liquid as a reaction catalyst to catalyze free fatty acid and short-chain alcohol to react for 6 to 12 hours at a temperature of between 60 and 120 DEG C, wherein a molar ratio of the free fatty acid to the short-chain alcohol is 1:1-1:6, and the ratio of the mass of the acid functional ionic liquid to the total mass of the reactants is 1:20-20:1; and B) cooling the reaction solution obtained in step A to room temperature, depositing the reaction solution by gravity, layering a product and the acid functional ionic liquid, and decompressing the upper layer of liquid to separate out the short-chain alcohol so as to obtain the product, wherein the acid functional ionic liquid consists of sulfonic functional alkyl pyridine anions, sulfonic functional 1, 3-dialkyl imidazole anions or sulfonic functional alkyl amine salt anions and inorganic or organic anions. The method has no environment pollution, and belongs to an environment-friendly process.

Description

technical field [0001] The invention relates to a method for catalyzing an esterification reaction with an acid-functionalized ionic liquid, in particular to a method for cleanly producing microbial diesel. Background technique [0002] The dwindling oil resources lead to energy shortages and soaring oil prices, making people pay more and more attention to the substitutes of petroleum fuels. Biodiesel is a petroleum diesel energy substitute that has attracted much attention in recent years. Biodiesel not only has the same combustion performance as petroleum diesel, but also has the advantages of environmental friendliness and renewable resources. It is one of the ideal fuels to replace petroleum diesel. Biodiesel is a monoalkyl ester of long-chain fatty acids, which is generally produced from animal and vegetable oils. However, my country has a large population and relatively scarce arable land, so it needs to import a large amount of edible oil to ensure the supply. The co...

Claims

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Application Information

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IPC IPC(8): C10G3/00C11C3/04
CPCY02P30/20
Inventor 咸漠张磊杨建明徐鑫孟鑫李强
Owner 青岛生物能源与过程研究所
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