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Method for extracting isostearic acid from mono acid

A technology of isostearic acid and monoacid, which is applied in the field of extracting isostearic acid from monoacid, can solve the problems of low separation efficiency and product impact, and achieve simple extraction method, low toxicity, and cheap and easy-to-obtain raw materials Effect

Inactive Publication Date: 2007-04-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of organic solvent needs to be recovered, the separation efficiency is not high, and the solvent has a certain impact on the product, such as using methanol as a solvent to form a small amount of methyl ester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 3kg of urea and 7kg of absolute ethanol into a reaction kettle with a stirrer and a reflux condenser, heat it in a water bath to 68°C under the conditions of stirring and reflux to dissolve the urea and obtain a clear solution, add 1kg of clay to catalyze oleic acid, Continue to stir and reflux for 30 minutes to stop the reaction. After cooling the reactant to room temperature, put it in a refrigerator at 10° C. and perform cold analysis for 15 hours. Suction filter the reactant after cold analysis to obtain white fatty acid-urea inclusion complex and light yellow filtrate. The inclusion complex can be dissolved in water to recover urea and obtain linear stearic acid. The filtrate contains solvent and isostearic acid Acids are therefore separated and collected.

[0032] Distill the filtrate under reduced pressure at a pressure of 0.09Mpa and a temperature of 37°C to remove absolute ethanol, and the recovery rate of the solvent can reach 80%. Wash with hot water at ...

Embodiment 2

[0034] The solvent in Example 1 was replaced with 8 kg of 95% ethanol aqueous solution, and the rest of the extraction steps were the same as in Example 1. As a result, 303 g of isostearic acid was obtained, with a yield of 30.3%, and the recovery rate was the theoretical content of isostearic acid in the monoacid of 84.4%. After determination, the acid value of the product is 177.4mgKOH / g, and the saponification value is 182.4mgKOH / g.

Embodiment 3

[0036] Add 3kg of urea and 6kg of 95% methanol aqueous solution into a reaction kettle with a stirrer and a reflux condenser, heat it in a water bath to 68°C under the condition of stirring and reflux, the urea dissolves quickly and forms a clear solution, add 1kg of linoleic acid After producing the by-products of dimer acid, continue to stir and reflux for 30 minutes to stop the reaction. After cooling the reactant to room temperature, put it in a refrigerator at 10° C. for 15 hours of cold analysis. The reactant after suction filtration and cold analysis was obtained white fatty acid-urea inclusion complex and light yellow filtrate. The filtrate was distilled under reduced pressure at a pressure of 0.10 MPa and a temperature of 45° C. to remove the solvent. Wash with hot water at 90°C and dry in a constant temperature oven at 40°C to obtain 342g of isostearic acid product with a yield of 34.2%. The recovery rate is the theory of isostearic acid in the by-product of linoleic...

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Abstract

The present invention discloses process of extracting isostearic acid from mono acid, and the process is simple and has facile material, high product yield and low product cost. The process includes the following steps: 1. adding carbamide and solvent into reactor, stirring and reflux heating to 30-80 deg.c in a water bath to dissolve carbamide and obtain clear solution; 2. adding material mono acid before further reflux for 0.5-5 hr and stopping heating; 3. cooling the resultant to room temperature and cold separating at -10 deg.c to 20 deg.c for 1-20 hr; 4. suction filtering the cold separated resultant to obtain white fatty acid-urea inclusion compound and yellow filtrate; 5. vacuum distilling the filtrate to eliminate solvent; and 6 washing the product with hot water and stoving in a stove at 30-100 deg.c to obtain the isostearic acid product.

Description

technical field [0001] The invention relates to a method for extracting isostearic acid, more specifically to a method for extracting isostearic acid from monoacids. Background technique [0002] Isostearic acid is a mixture of branched chain methyl fatty acids. It has low melting point, low iodine value, and good oxidation stability. It can be used to prepare cream cosmetics, used as a thickener and emollient, and has mild adsorption. Forms a dry, non-greasy film on the skin, and has a certain softening effect on skin oil. Glycerin polyoxyethylene ether pyroglutamic acid di-isostearate is added to stable cosmetics containing sodium ascorbyl 2-phosphate and polyols, which has obvious moisturizing effect on the skin and also has a whitening effect on the skin. In sunscreen lotion, the water-in-oil emulsion of polyglyceryl isostearate and cetyl silicone polymer can not only greatly improve the SPF value, but also has high water resistance activity, low active substance conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/128C07C51/487C07C51/42
Inventor 姚成张培培徐永林陆为林
Owner NANJING UNIV OF TECH
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