Parallel methyl ester method for fats and oils in high acid value

A technology of high acid value oil and methyl esterification, applied in the field of oil processing, can solve the problems of large waste water discharge, low production efficiency, slow reaction speed, etc., and achieve the effects of less waste water discharge, full utilization of equipment, and increased reaction rate.

Inactive Publication Date: 2007-10-10
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In a word, the existing high-acid value oil esterification method has the following disadvantages: 1. It is easy to saponify free fatty acids and cause a large product loss in the separation process; 2. The reaction speed is slow and the production efficiency is low; 3. The amount of wastewater discharge is large.

Method used

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  • Parallel methyl ester method for fats and oils in high acid value

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) After the acidified oil with an acid value of 100 mgKOH / g is vacuum dehydrated to make the water content lower than 0.1%, methanol with 1.5 times the volume is used as the extraction agent and extracted 6 times at 32° C. to obtain a product enriched in free fatty acids an extract phase and a raffinate phase enriched in triglycerides, wherein the acid value of the raffinate phase is 0.8 mgKOH / g;

[0023] (2) Carry out following reaction respectively:

[0024] a) adding oily 3% concentrated sulfuric acid to the extract phase as a catalyst, reacting at 60°C for 5 hours to carry out methylation reaction to obtain crude fatty acid methyl ester;

[0025] b) Add calcium oxide with an oil weight of 0.8% to the raffinate phase as a catalyst, control the molar ratio of methanol and triglyceride to 3:1, react at 60° C. for 50 minutes, and obtain an intermediate product with a conversion rate of 35%. 50% (by mass, the same below) of the intermediate product was mixed with the ...

Embodiment 2

[0028] (1) Crude oil with an acid value of 40mgKOH / g is used as a raw material, and in a countercurrent rotary disk extraction tower, 1.5 times the mass of methanol is continuously extracted as an extractant to obtain an extract phase enriched in free fatty acids and a raffinate enriched in triglycerides phase, wherein the acid value of the raffinate phase is 0.9mgKOH / g. Part of the methanol is recovered from the extract phase through the evaporator, and the molar ratio of methanol to free fatty acid is controlled to be 25:1;

[0029] (2) Carry out following reaction respectively:

[0030] a) adding oily 3% concentrated sulfuric acid to the extract phase as a catalyst, reacting at 70° C. for 5 hours to carry out methylation reaction to obtain crude fatty acid methyl ester;

[0031] b) Add the calcium oxide / magnesia composite catalyst of 0.9% oil weight and the fatty acid methyl ester, fatty acid monoglyceride and fatty acid diglyceride mixture of oil weight 10% in the raffina...

Embodiment 3

[0034] (1) Crude oil with an acid value of 60mgKOH / g is used as a raw material, and in a countercurrent rotary disk extraction tower, methanol is used as an extraction agent with twice the mass for continuous extraction to obtain an extract phase enriched in free fatty acids and a raffinate enriched in triglycerides Phase, wherein the acid value of the raffinate phase is 1mgKOH / g. Part of the methanol is recovered from the extract phase through the evaporator, and the molar ratio of methanol to free fatty acid is controlled to be 30:1;

[0035] (2) Do not carry out the following reactions:

[0036] a) adding oily 3% concentrated sulfuric acid to the extract phase as a catalyst, reacting at 60°C for 5 hours to carry out methylation reaction to obtain crude fatty acid methyl ester;

[0037] b) in the raffinate phase, add the sodium hydroxide of 0.9% of oil weight as catalyst and the mixture of fatty acid methyl ester, fatty acid monoglyceride and fatty acid diglyceride of oil w...

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Abstract

This invention discloses a method for producing fatty acid methyl ester from high-acid-value grease by parallel methyl esterification. The method solves the problems of large raw material loss, low reaction efficiency, low apparatus utility and large wastewater discharge faced by present methods. The method comprises: (1) extracting high-acid-value grease with methanol; (2) performing parallel methyl esterification and interesterification reactions to obtain crude fatty acid methyl ester; (3) refining crude fatty acid methyl ester. A mixture of fatty acid methyl ester, fatty acid monoglyceride, and fatty acid diglyceride can be added during the interesterification reaction to prevent mass transfer hindrance. The method has such advantages as low raw material loss, high reaction efficiency, and high apparatus utility, and can be used to produce fatty acid methyl ester from restaurant waste oil, food processing waste oil and acidified oil from refinery plants.

Description

technical field [0001] The invention relates to a method for producing fatty acid methyl ester by utilizing high acid value oil, which belongs to oil processing method. Background technique [0002] There are mainly one-step esterification and two-step esterification methods for the production of fatty acid methyl esters from oils with high acid value. Among them, the one-step esterification method refers to the use of acidic catalysts to simultaneously catalyze the methylation reaction of free fatty acids and methanol and triglycerides. The transesterification reaction with methanol converts all the fatty substances in the raw material into fatty acid methyl esters. Since the acidic catalyst catalyzes the transesterification reaction efficiency is very low, so the reaction time is very long and the conversion rate is low, resulting in low production efficiency. If it is necessary to improve the reaction efficiency, high temperature and high pressure are required, which con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04
Inventor 刘晔刘大川佘珠花杨浩
Owner WUHAN POLYTECHNIC UNIVERSITY
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