Method for separating and purifying linoleic acid from grease raw material

A technology for separation and purification of linoleic acid, which is applied in the separation/purification of carboxylic acid compounds, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of high energy consumption and complicated process, and achieve low energy consumption and high quality. The effect of high recovery rate, simple equipment and process

Inactive Publication Date: 2018-06-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above documents all involve the separation and purification of linoleic acid, and there are different extraction

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Accurately weigh 40g of sodium hydroxide and dissolve it in 800ml of water, slowly add 200g of soybean oil, stir and react at 80°C for 3h, add 150ml of sulfuric acid aqueous solution with a concentration of 2mol / L under heat preservation conditions for 1h, and layer to obtain 180g of mixed fatty acids ;

[0036] 2) Dissolve 180 g of mixed fatty acids in 320 g of absolute ethanol, freeze and crystallize at -5°C for 5 hours, filter, take the filtrate and spin evaporate, add anhydrous sodium sulfate to dry to obtain 128 g of unsaturated fatty acids;

[0037] 3) Dissolve 128 g of the obtained unsaturated fatty acid in 128 g of acetone solution, slowly add 100 g of zinc chloride solution with a concentration of 5 mol / L dropwise, and stir and react at 400 r / min for 5 h under heating conditions at 70 ° C to prepare fatty acid zinc Acetone solution;

[0038] 4) The obtained fatty acid zinc acetone solution was stirred at 400r / min and slowly cooled to -7°C for crystallizatio...

Embodiment 2

[0045] 1) Accurately weigh 20g of sodium hydroxide and dissolve it in 1000ml of water, slowly add 250g of peanut oil, stir and react at 80°C for 3h, add 200ml of sulfuric acid aqueous solution with a concentration of 1mol / L to react for 1h under heat preservation conditions, and obtain 220g of mixed fatty acids by layering;

[0046] 2) 220 g of the obtained mixed fatty acid was dissolved in 880 g of methanol, frozen and crystallized at -10°C for 3 hours, filtered, and the filtrate was freeze-dried to obtain 152 g of unsaturated fatty acid;

[0047] 3) Dissolve 152 g of the obtained unsaturated fatty acid in 1000 g of petroleum ether solution, slowly add 100 g of zinc sulfate solution with a concentration of 5 mol / L dropwise, heat up to 70° C. and react at a stirring speed of 350 r / min for 5 hours to prepare fatty acid zinc Petroleum ether solution;

[0048] 4) The obtained fatty acid zinc petroleum ether solution was stirred at a speed of 350 r / min, and slowly cooled to -15°C ...

Embodiment 3

[0055] 1) Accurately weigh 50g of potassium hydroxide and dissolve it in 1200ml of water, slowly add 300g of safflower seed oil, stir and react at 80°C for 3h, add 250ml of sulfuric acid aqueous solution with a concentration of 2mol / L under heat preservation conditions for 1h, and layer to obtain 268g mixed fatty acids;

[0056] 2) Add 268g of the obtained mixed fatty acid into 600g of isopropanol to dissolve, freeze and crystallize at -10°C for 3 hours, filter, take the filtrate and add anhydrous magnesium sulfate and put it in a vacuum drying oven to dry to obtain 238g of unsaturated fatty acid;

[0057] 3) Dissolve 238g of the obtained unsaturated fatty acid in 1500g of 1,4-dioxane solution, slowly add 150g of zinc acetate solution with a concentration of 8mol / L dropwise, and react at a stirring speed of 450r / min under heating at 90°C 3h, preparing a 1,4-dioxane solution of fatty acid zinc;

[0058] 4) The obtained 1,4-dioxane solution of fatty acid zinc was slowly cooled ...

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Abstract

The invention discloses a method for separating and purifying linoleic acid from a grease raw material. The method comprises the following steps: performing saponification and acidification on greaseso as to obtain fatty acid, pretreating the obtained fatty acid by using a freeze crystallization method so as to effectively separate saturated fatty acid from unsaturated fatty acid, forming fatty acid precipitate from the *fatty acid, and finally separating oleic acid from linoleic acid, thereby obtaining the high-content linoleic acid. The method disclosed by the invention is simple in step and convenient to operate, and the prepared linoleic acid is high in purity and good in quality.

Description

technical field [0001] The invention relates to a method for separating and purifying linoleic acid by using oil raw materials. Background technique [0002] Linoleic acid is the most important dienoic acid in natural oils, namely cis-9, cis-12-octadecadienoic acid, which is the earliest recognized essential fatty acid and has important physiological functions. Linoleic acid is transformed into arachidonic acid through metabolism. Human cholesterol metabolism needs to be combined with fatty acids, especially linoleic acid, an essential fatty acid, to promote emulsification, transportation and metabolism. When linoleic acid is lacking, cholesterol will be combined with other fatty acids. Combined, attached to the blood vessel wall, forming atherosclerosis, causing cardiovascular and cerebrovascular diseases. At the same time, in the field of cosmetics and health care, linoleic acid has a certain cosmetic effect, can resist radiation, can promote human growth and development,...

Claims

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Application Information

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IPC IPC(8): C07C51/487C07C51/43C07C57/12
CPCC07C51/43C07C51/487C07C57/12
Inventor 刘学军姚静雯计建炳俞云良
Owner ZHEJIANG UNIV OF TECH
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