Method for catalyzing phosphotungstic acid ionic liquid to prepare biodiesel

An ionic liquid, biodiesel technology, applied in chemical instruments and methods, biofuels, fatty acid esterification, etc., can solve the problems of easy loss of active components, and achieve the effects of low price, mild reaction conditions, and no corrosion of equipment

Active Publication Date: 2014-12-10
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the heterogeneous catalytic reaction, the further improvement of its esterification rate is also limited, and the active components of the heteropolyacid catalyst are easily lost.

Method used

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  • Method for catalyzing phosphotungstic acid ionic liquid to prepare biodiesel
  • Method for catalyzing phosphotungstic acid ionic liquid to prepare biodiesel
  • Method for catalyzing phosphotungstic acid ionic liquid to prepare biodiesel

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The intermediate bromo-N-methyl-N-butylmorpholine was added dropwise to aqueous phosphotungstic acid (3:1 molar ratio) using a constant-pressure dropping funnel, and reacted at room temperature for 24 hours. The obtained product was washed three times with deionized water to achieve the purification effect. The product was dried in a vacuum oven (0.02MPa) at 60°C to constant weight, and then activated at 120°C for 3 hours to obtain activated N-methyl-N-butylmorpholine phosphotungstic acid ionic liquid.

[0038] Add soybean oil and methanol into a three-necked flask with a reflux condensation device at a molar ratio of 1:40, and then add phosphotungstic acid ionic liquid whose mass is 5% of the mass of soybean oil. React at a reaction temperature of 60°C and under normal pressure for 8 hours. After the reaction, methanol is distilled off under reduced pressure. The remaining mixture is centrifuged to remove the solid catalyst. The rest of the liquid is transferred to a s...

Embodiment 2

[0040] The intermediate N-methyl-N-dodecylmorpholine bromide was added dropwise to aqueous phosphotungstic acid (3:1 molar ratio) using a constant-pressure dropping funnel, and reacted at room temperature for 24 hours. The obtained product was washed three times with deionized water to achieve the purification effect. The product was dried in a vacuum oven (0.02MPa) at 60°C to constant weight, and then activated at 120°C for 3 hours to obtain activated N-methyl-N-dodecylmorpholine phosphotungstic acid ionic liquid.

[0041] Add castor oil and methanol into a three-necked flask with a reflux condensation device at a molar ratio of 1:40, and then add phosphotungstic acid ionic liquid whose mass is 5% of the mass of castor oil. React at a reaction temperature of 45°C and under normal pressure for 8 hours. After the reaction, methanol is distilled off under reduced pressure. The remaining mixture is centrifuged to remove the solid catalyst. The upper layer is mainly biodiesel. Th...

Embodiment 3

[0043]The intermediate bromo-N-methyl-N-butylmorpholine was added dropwise to aqueous phosphotungstic acid (3:1 molar ratio) using a constant pressure dropping funnel, and reacted at room temperature for 48 hours. The obtained product was washed three times with deionized water to achieve the purification effect. The product was dried in a vacuum oven (0.02MPa) at 60°C to constant weight, and then activated at 150°C for 3 hours to obtain activated N-methyl-N-butylmorpholine phosphotungstic acid ionic liquid.

[0044] Add rapeseed oil and methanol into a three-necked flask with a reflux condensation device at a molar ratio of 1:20, and then add phosphotungstic acid ionic liquid whose mass is 5% of the mass of rapeseed oil. React at a reaction temperature of 64°C and under normal pressure for 8 hours. After the reaction, the methanol was distilled off under reduced pressure, and the remaining mixture was centrifuged to remove the solid catalyst. The upper layer is mainly biodie...

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Abstract

The invention belongs to the technical filed of ionic liquid catalysis preparation of biodiesel and particularly relates to a method for catalyzing phosphotungstic acid ionic liquid to prepare biodiesel. The method comprises the following steps: by taking biolipid and methanol as raw materials, taking a phosphotungstic acid ionic fluid as a catalyst to prepare the biodiesel by virtue of ether exchange reaction, wherein a molar ratio of the biolipid to the methanol is (1:20) to (1:50), the ionic liquid accounts for 1-10% of the mass of the biolipid, the reaction temperature is 45-64 DEG C and the reaction time is 3-11 hours. The method has the following advantages that firstly, the ionic liquid is simple in preparation process and relatively low in cost; secondly, the catalyst is high in activity, less in dosage, gentle in reaction condition and short in reaction time; and thirdly, the ionic liquid is stable in performance, capable of being repeatedly used, simple in separating process, low in after-treatment cost, free of pollution, free of corrosion on equipment, environmentally friendly, and capable of being expected to become a clean process route with competitive force.

Description

technical field [0001] The invention relates to a method for preparing biodiesel by catalysis of phosphotungstic acid ionic liquid, and belongs to the technical field of green and environment-friendly new energy production. Background technique [0002] Biodiesel is a fatty acid methyl ester fuel obtained from oil plants, oil crops, animal fats and waste cooking oil through transesterification. It is a mixture of several fatty acid methyl esters. Biodiesel is an environmentally friendly fuel that can replace conventional diesel. Its production route is the esterification reaction of fatty acids or the transesterification reaction of triglycerides and short-chain alcohols under the action of acid or base catalysis. [0003] Traditionally, heterogeneous inorganic acids and bases are the usual catalysts for transesterification reactions. However, inorganic base catalysts may cause saponification. Mineral acids such as concentrated sulfuric acid catalyze the production rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C10L1/02B01J31/12
CPCY02E50/10
Inventor 王璐璐王吉林
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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