Method for reducing acid value of bio-oil materials

A technology for oil acid value and biology, applied in the production of fatty acids, preparation/refining of fatty acids, etc., can solve the problems of increased dosage, a large amount of waste acid, waste water, corrosion, etc., and achieve the effect of removing odor and reducing acid value with high efficiency

Active Publication Date: 2009-09-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the prior art that for oils with high acid value, such as the acid value is greater than 2.0mgKOH / g, it is generally necessary to carry out esterification treatment on the oil in advance to change the free fatty acid into fatty acid methyl ester and reduce the acid value of oil In this process, if sulfuric acid is used as a catalyst, the corrosion is severe, and a large amount of waste acid and waste water will be produced; the liquid acid catalyst left in the material after pre-esterification needs to be neutralized with alkali, and the alkali is used as the catalyst for the subsequent transesterification reaction. The consumption will increase, the whole process will have many steps, the process will be longer, and the equipment investment and energy consumption will increase significantly
In addition, after the reaction is completed, the basic catalyst needs to be removed from the product, which will also produce a large amount of waste water, serious material loss, and difficulty in recovering glycerin. The same problem exists in the direct neutralization of free fatty acids with alkali. If a solid acid is used as a catalyst, there will be The catalyst is more expensive and the service life is shorter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 195Kg of the ester mixture whose main component is fatty acid methyl ester (remove most of the methanol and glycerol from the transesterification reaction product, and then remove part of the monoglyceride, most of the diglyceride and all triglycerides by distillation) Mixed esters, brownish red, acid value 3.8mgKOH / g.) and ethanolamine are put into a stirred tank, the value of K is 0.9, at a reaction temperature of 75-80°C, a stirring speed of 490 rpm, after stirring for 60 minutes, let it stand After 40 minutes, the layers were separated, and the upper ester phase changed into a slightly bright yellow transparent liquid. The peculiar smell had been removed, and the acid value was 0.26mgKOH / g, reaching the standard of BD100 biodiesel.

Embodiment 2

[0023] 59.8g of the ester mixture whose main component is fatty acid methyl ester (removing most of methanol and glycerol from the transesterification reaction product, and then removing part of monoglyceride, most of diglyceride and all triglyceride through distillation) Mixed esters, brownish red, acid value 3.8mgKOH / g.) and ethanolamine were put into a three-necked flask, the value of K was 0.79, at a reaction temperature of 75-80°C, a stirring speed of 490 rpm, after stirring for 60 minutes, let it stand After 40 minutes, the layers were separated, and the upper ester phase changed into a slightly bright yellow transparent liquid. The peculiar smell had been removed, and the acid value was 0.79 mgKOH / g, reaching the standard of BD100 biodiesel.

Embodiment 3

[0025] 59.7g of the ester mixture whose main component is fatty acid methyl ester (remove most of methanol and glycerol from the transesterification reaction product, and then remove part of monoglyceride, most of diglyceride and all triglyceride by distillation) Mixed ester, brownish red, acid value 3.8mgKOH / g.) and diethanolamine were put into a three-necked flask, the value of K was 0.65, at a reaction temperature of 75-80°C, a stirring speed of 490 rpm, after stirring for 60 minutes, static Leave it for 40 minutes, separate layers, and the upper ester phase turns into a slightly bright yellow transparent liquid, the peculiar smell has been removed, and the acid value is 0.17mgKOH / g, reaching the standard of BD100 biodiesel.

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Abstract

The invention relates to a method for reducing the acid value of bio-oil materials, which comprises the following steps of evenly mixing bio-oil materials and alcohol amine compound, standing, layering, separating and collecting the bio-oil materials with reduced acid value. The bio-oil materials can be natural oil or products of ester exchange reaction of the oil. The method has high acid value reduction effect without generating a great deal of waste water, is convenient for environment protection, can effectively remove peculiar smell in biodiesel and has decoloration effect.

Description

technical field [0001] The invention relates to a method for reducing the acid value of biological oil. Background technique [0002] Biodiesel can be produced by transesterification of natural oils and monohydric alcohols. In addition to fatty acid esters, the products of transesterification may also contain monoglycerides, diglycerides, glycerol by-products, free fatty acids, and unreacted fatty acids. Alcohol and fat raw materials. Fatty acid esters (usually fatty acid methyl or ethyl esters) are generally called biodiesel, which may also contain monoglycerides, diglycerides, glycerin and other substances. The acid value of oil varies greatly, and the acid value of some oils can reach 150mgKOH / g. When using oil with high acid value to prepare biodiesel, in order to make the acid value of the product meet the standard requirements, the acid value of the raw material or product can be reduced. [0003] CN1031070C uses concentrated sulfuric acid, phosphoric acid or p-tolue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C1/00
Inventor 王海京杜泽学闵恩泽陈艳凤
Owner CHINA PETROLEUM & CHEM CORP
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