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Method for extracting phytosterol from residual biodiesel

A technology of biodiesel and phytosterols, applied in the direction of steroids, organic chemistry, etc., can solve the problems of waste, phytosterols not being paid attention to and utilized, etc., and achieve the effect of good industrialization feasibility, strong operability and simple process

Inactive Publication Date: 2013-07-24
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the biodiesel production process, there will be residual oils that account for about 5% to 10% of the main product, and these residual oils contain 2% to 10% of phytosterols. Phytosterols have not been valued and utilized, resulting in huge waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Add biodiesel residue and sodium methoxide aqueous solution to the reaction kettle, and heat to 65° C. for alcoholysis reaction under stirring conditions. The reaction time is 5 hours; 60%; The mass percentage composition of sodium methoxide in the described sodium methoxide aqueous solution is 12%;

[0024] Step 2. Add fatty acid methyl ester to the reaction kettle after the alcoholysis reaction in step 1, heat up to 65°C under stirring conditions, and then slowly add concentrated sulfuric acid to the reaction kettle. The addition time of concentrated sulfuric acid is 45min. The esterification reaction was carried out under the following conditions, and the reaction time was 5h (not including the addition time of concentrated sulfuric acid); the addition of the fatty acid methyl ester was 0.5 times of the biodiesel residue quality, and the acid value of the fatty acid methyl ester was 5mgKOH / g; The add-on of the vitriol oil is 10% of the biodiesel residue quali...

Embodiment 2

[0031] Step 1. Add biodiesel residue and sodium methoxide aqueous solution to the reaction kettle, and heat to 75° C. for alcoholysis reaction under stirring conditions. The reaction time is 2 hours; 70%; The mass percentage composition of sodium methoxide in the described sodium methoxide aqueous solution is 10%;

[0032] Step 2. Add fatty acid methyl ester to the reaction kettle after the alcoholysis reaction in step 1, heat up to 70°C under stirring conditions, and then slowly add concentrated sulfuric acid to the reaction kettle. The addition time of concentrated sulfuric acid is 50min. The esterification reaction was carried out under the following conditions, and the reaction time was 4h (not including the addition time of concentrated sulfuric acid); the addition of the fatty acid methyl ester was 1 time of the biodiesel residue quality, and the acid value of the fatty acid methyl ester was 4mgKOH / g; The add-on of said concentrated sulfuric acid is 15% of biodiesel resi...

Embodiment 3

[0039] Step 1. Add biodiesel residue and sodium methoxide aqueous solution to the reaction kettle, and heat to 70° C. for alcoholysis reaction under stirring conditions. The reaction time is 3 hours; 65%; The mass percentage composition of sodium methoxide in the described sodium methoxide aqueous solution is 11%;

[0040] Step 2. Add fatty acid methyl ester to the reaction kettle after the alcoholysis reaction in step 1, heat up to 75°C under stirring conditions, and then slowly add concentrated sulfuric acid into the reaction kettle. The addition time of concentrated sulfuric acid is 40min. The esterification reaction is carried out under the following conditions, and the reaction time is 3h (not including the adding time of concentrated sulfuric acid); the addition of the fatty acid methyl ester is 0.8 times of the biodiesel residue quality, and the acid value of the fatty acid methyl ester is 3mgKOH / g; The addition of the concentrated sulfuric acid is 12% of the biodiesel ...

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Abstract

The invention discloses a method for extracting phytosterol from residual biodiesel. The method comprises the steps of: firstly, adding residual biodiesel and a sodium methoxide water solution in a reaction kettle for an alcoholysis reaction; secondly, after the alcoholysis reaction, adding fatty acid methyl ester and concentrated sulfuric acid in the reaction kettle for an esterification reaction; thirdly, after the esterification reaction, washing the material to neutral by hot water of 60-80 DEG C, and then filtering the material when the material is hot, thus obtaining a filtrate; fourthly, implementing four-stage molecular distillation on the filtrate; fifthly, mixing a third-stage distillate with a fourth-stage distillate after the four-stage molecular distillation, adding fatty acid methyl ester in the mixed distillate to obtain a mixture, then heating the mixture until sterol is dissolved completely, cold precipitating and press-filtering the mixture, thus obtaining coarse sterol; and sixthly, washing the coarse sterol by alcohol and then drying the coarse sterol, thus obtaining the refined phytosterol. According to the method, impurities are removed in a molecular distillation way, the content of sterol is guaranteed, the quality purity of the extracted phytosterol can achieve over 95% and the yield can achieve over 80%.

Description

technical field [0001] The invention belongs to the technical field of preparation of phytosterol esters, in particular to a method for extracting phytosterols from biodiesel residue. Background technique [0002] Phytosterols are important components of plant cells and have the characteristics of high nutritional value and strong physiological activity. Phytosterols may reduce the risk of cardiovascular disease by lowering cholesterol. Phytosterols have a strong anti-inflammatory effect on the human body, and can inhibit the body's absorption of cholesterol, promote the degradation and metabolism of cholesterol, and inhibit the biochemical synthesis of cholesterol; it is used for the prevention and treatment of coronary atherosclerotic heart disease. It has obvious curative effect in the treatment of ulcer, skin squamous cell carcinoma, cervical cancer, etc.; it can promote wound healing, make muscle hyperplasia, and enhance capillary circulation; it can also be used as an...

Claims

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Application Information

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IPC IPC(8): C07J9/00
Inventor 余竹焕
Owner XIAN UNIV OF SCI & TECH
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