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Method for reducing acid value through catalyzing glycerol esterification with solid base

A technology for alkali-catalyzed glycerol and esterification, which is applied in the field of reducing the fatty acid content in oils and fats by an esterification method, and achieves the effects of no environmental pollution, reduced generation of saponification products, and simple post-treatment.

Inactive Publication Date: 2015-06-10
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

MOH / Al of the present invention 2 o 3 Type solid base catalyzed the esterification reaction of glycerol and higher fatty acids No relevant reports were retrieved, which is the first

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 100g of dehydrated oil (acid value 150mgKOH / g) to a 250ml three-neck flask, add a theoretical amount of glycerin, and powdered KOH / SiO with 0.5% crude oil mass 2 Solid base catalyst, under the condition of vacuum degree 0.085 ~ 0.095Mpa, stir and heat to 160 ℃, react for 6 hours, the acid value drops to 0.22mgKOH / g, the acid value is measured according to GB / T5530-1985 method, the mass yield is 106 %.

Embodiment 2

[0023] Add 100g of dehydrated oil (acid value 115mgKOH / g) to a 250ml three-neck flask, add a theoretical amount of glycerin, and powdered KOH / TiO with 1% crude oil mass 2 Solid base catalyst, under the condition of vacuum degree 0.085 ~ 0.095Mpa, stir and heat to 140 ℃, react for 4 hours, the acid value drops to 0.26mgKOH / g, the acid value is measured according to the method of GB / T5530-1985, and the mass yield is 104 %.

Embodiment 3

[0025] Add 100g of dehydrated oil (acid value 35mgKOH / g) to a 250ml three-necked flask, add a theoretical amount of glycerin, and powdered NaOH / γ-Al with 1.5% crude oil mass 2 o 3 Solid base catalyst, under the condition of vacuum degree 0.085 ~ 0.095Mpa, stir and heat to 120 ℃, react for 5 hours, the acid value drops to 0.21mgKOH / g, the acid value is measured according to GB / T5530-1985 method, the mass yield is 101 %.

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PUM

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Abstract

The invention discloses a method for reducing acid value through catalyzing glycerol esterification with a solid base. The method comprises the following steps: adding glycerol and a solid base catalyst into the dehydrated oil, heating and stirring, vacuumizing to remove the water produced by the reaction, filtering and recycling the catalyst after the reaction is ended, thereby obtaining the oil of which the acid value is less than 0.3mg KOH / g. According to the method disclosed by the invention, the esterification rate can be over 99.5 percent, the composition completely refers to fatty acid triglyceride, the after-treatment is simple, any environmental pollution is avoided, and industrial production is promoted.

Description

technical field [0001] The invention relates to a method for reducing fatty acid content in oil by esterification. It can be used for acid value reduction of edible oils and pre-esterification of biodiesel. Background technique [0002] During the process of processing, storage and circulation, under the action of heat, moisture, metals, microorganisms and enzymes, oil will be hydrolyzed to release free fatty acids. An increase in the content of free fatty acids in oils will cause a decrease in the smoke point and surface tension of oils, resulting in a decrease in the stability of oils and oily foods. Acid value is one of the important indicators to evaluate the stability of edible oil and whether the processing technology is reasonable. Therefore, many crude oils need to be refined by alkali to reduce the acid value in order to meet the national edible oil standards. [0003] Biodiesel is an important field of oil application, especially for waste oils and esters. There...

Claims

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Application Information

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IPC IPC(8): C11C3/06C10L1/02
CPCC11C3/06C10L1/02
Inventor 李修刚张玲钰石维唐帮成吕思均王云川胡仕琴冯树模
Owner TONGREN UNIV
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