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Method for preparing fatty acid ester by micro-channel reactor

A technology of microchannel reactor and fatty acid ester, which is applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc. It can solve the problems of high raw material requirements, low conversion rate and yield, long reaction time, etc. problems, to achieve the effect of wide adaptability of raw materials, high yield and short reaction residence time

Inactive Publication Date: 2008-03-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to overcome the high requirements of raw materials for the preparation of biodiesel (wherein the content of free fatty acid cannot be higher than 1%), for raw materials with high acid value, there are problems such as long reaction time, conversion rate and yield in acid catalysis technology. In view of the disadvantages such as low efficiency, a method for rapidly synthesizing fatty acid esters in a microchannel reactor under the action of an acidic catalyst is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] 5 g of cottonseed oil and 7.38 g of methanol reaction mixture 1 containing 0.15 g of concentrated sulfuric acid were injected into a quartz microchannel reactor 3 with an inner diameter of 0.53 mm through a high-pressure pump 2, and the reaction temperature was controlled at 115° C. and the residence time was 15 min. The reaction product 6 was collected and analyzed by gas chromatography to obtain a yield of 50.5% of cottonseed oil methyl ester.

example 2

[0016] After mixing 5g of cottonseed oil and 7.387g of methanol containing 0.30g of concentrated sulfuric acid, inject it into a stainless steel microchannel reactor with an inner diameter of 0.6mm at normal pressure and temperature controlled at 170°C through a high-pressure pump, and adjust the reactants in the microchannel. The residence time in the reactor was 30 min. The yield of cottonseed oil methyl ester obtained by the reaction is 87.4%.

example 3

[0018] After mixing 5 g of cottonseed oil and 9.233 g of methanol containing 0.15 g of concentrated sulfuric acid, the mixture was injected into a quartz microchannel reactor with an inner diameter of 0.2 mm through a high-pressure pump, and the reaction temperature was controlled at 115 °C and the residence time was 19.5 min. The yield of cottonseed oil methyl ester obtained by the reaction is 97.1%.

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Abstract

The present invention relates to preparation of biodiesel oil, and is especially process of producing fatty ester as biodiesel oil with grease and alcohol as materials and through ester interchange reaction inside a micro channel reactor. The process has the following steps: injecting the mixture of grease, low carbon alcohol and acid catalyst into one micro channel reactor of 0.1-2.0 mm inner diameter; and reaction at normal pressure and 90-170 deg.c for 5-60 min to prepare fatty ester. The preparation process has the advantages of excellent material adaptability, continuous reaction, short reaction period, high fatty ester yield, etc.

Description

Technical field: [0001] The invention relates to a preparation method of fatty acid ester, in particular to a method for producing fatty acid ester (abbreviated as biodiesel) through transesterification reaction in a microchannel reactor using oil and alkyl alcohol as raw materials. Background technique: [0002] The increasing scarcity of fossil energy and the huge harm caused by combustion to the environment require human beings to accelerate the research and development of clean, efficient and renewable new energy. How to efficiently and cleanly utilize biomass energy has become an urgent need for sustainable economic and social development in our country. Biodiesel has the advantages of high cetane number, no sulfur and no aromatic compounds, and is biodegradable. It has received extensive attention in recent years. At present, the industrial production of biodiesel mainly adopts the normal-pressure low-temperature transesterification method using alkali (sodium methoxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/58C07C67/08
Inventor 张利雄孙娟姚建峰徐南平
Owner NANJING UNIV OF TECH
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