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Preparation method of ascorbic acid aliphatic ester

A technology of ascorbic acid and fatty acid esters, applied in the direction of organic chemistry, can solve the problems of high cost and complexity, and achieve the effect of low cost, simple method, and omission of equipment and operators

Inactive Publication Date: 2005-01-05
BEIJING CHENAO HIGH SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the relatively complicated and relatively high-cost shortcomings of the prior art, and provide a relatively simple and low-cost ascorbic acid fatty acid ester preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] This example illustrates the method provided by the invention.

[0029] In a 500 milliliter three-necked bottle equipped with a thermometer, a stirrer and a reflux tube, add 250 milliliters of commercially available concentrated sulfuric acid (concentration is 95-98% by weight), and add 50 grams (0.28 moles) of L-ascorbic acid (medicine) under stirring. Grade, purity is ≥ 99% by weight), after dissolving completely, be warming up to 30 degrees centigrade, add 64 grams (0.25 mole) palmitic acid (industrial level, purity is ≥ 98% by weight) in three times, add 25 grams for the first time, add After finishing, react at 40 degrees Celsius for 1 hour, add 20 grams for the second time, after adding, react at 40 degrees Celsius for 1 hour, add 19 grams for the third time, after adding, continue to react at 40 degrees Celsius for 4 hours, A reacted mixture containing L-ascorbyl palmitate was obtained. Wherein, the molar ratio of L-ascorbic acid to palmitic acid is 1.12, and th...

example 2

[0034] This example illustrates the method provided by the invention.

[0035] Prepare L-ascorbyl palmitate by the method for example 1, difference is, before adding palmitic acid for the second time, also added 12 grams of water-absorbing agent P 2 o 5 (2.4% by weight of the sulfuric acid consumption), obtain 75 grams of refined L-ascorbyl palmitate, and the yield of L-ascorbyl palmitate is 72.5% by weight. Its properties are shown in Tables 1 and 2.

example 3

[0037] This example illustrates the method provided by the invention.

[0038] Prepare L-ascorbyl palmitate by the method of example 1, the difference is, before adding L-ascorbic acid, also added 25 milliliters containing SO 3 20-23% by weight of oleum water-absorbing agent (9.5% by weight of sulfuric acid consumption), to obtain 78 grams of refined L-ascorbyl palmitate, the yield of L-ascorbyl palmitate is 75.4% by weight. Its properties are shown in Tables 1 and 2.

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Abstract

The present invention relates to a method for preparing ascorbic acid aliphatic ester, and said method includes the following steps: preparing a mixture containing 95-100 wt% of sulfuric acid, ascorbic acid and aliphatic acid, making the described mixture produce reaction to obtain the reaction produce mixture containing ascorbic acid aliphatic ester, and separating out ascorbic acid aliphatic ester from it, the mole ratio of ascorbic acid and aliphatic acid is 1 to less than 1.25, and the weight ratio of sulfuric acid and ascorbic acid is at least 6. The reaction mixture is mixed with ice whose volume dose is 2-10 times that of sulfuric acid and / or water whose temp. is below 5 deg.C, then mixed with an aromatic hydrocarbon solvent, and said mixture is hented, and cooled to obtain an organic phase, said organic phase is filtered and dried so as to obtain a solid, i.e. the invented product.

Description

field of invention [0001] The invention relates to a preparation method of ascorbic acid fatty acid ester. Background technique [0002] Ascorbyl fatty acid esters are well known, such as ascorbyl palmitate (ie ascorbyl palmitate), ascorbyl myristate (ie ascorbyl myristate), ascorbyl octadecanoate (ie ascorbyl stearate ), ascorbyl lauryl ester (i.e. ascorbyl laurate) has strong antioxidant properties and can be widely used as high-fat substances, such as nuts, potato chips, mayonnaise, margarine, and various other foods such as Antioxidant in edible oil, meat, fruit, flour products, dairy products and some cosmetics. Among them, L-ascorbic acid fatty acid esters, such as L-ascorbyl palmitate, contain vitamin C, an essential nutrient for the human body, and its nutrients are not destroyed at higher temperatures. Therefore, in some developed countries, L- Ascorbyl fatty acid esters, such as L-ascorbyl palmitate, have been widely used. In our country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/62
Inventor 阎建斌陈东
Owner BEIJING CHENAO HIGH SCI & TECH DEV
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