Preparation method of high-purity methyl oleate

A technology of methyl oleate and methyl linoleate, which is applied in the field of preparation of high-purity methyl oleate, can solve problems such as cumbersome operation, and achieve the effect of good color and high purity

Pending Publication Date: 2020-10-16
杭州国盛新材料科技有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent publications CN104046508A and CN104529739A disclose purification methods for unsaturated fatty acids. The former invol

Method used

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  • Preparation method of high-purity methyl oleate
  • Preparation method of high-purity methyl oleate
  • Preparation method of high-purity methyl oleate

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preparation example Construction

[0026] see figure 1 , the invention provides a kind of preparation method of high-purity methyl oleate, comprises the following steps,

[0027] S1, adding urea and methyl oleate raw materials into a low-carbon alcohol solution, heating and dissolving to a homogeneous solution, cooling and freezing the homogeneous solution, and separating urea-coated substances of low-carbon chain methyl esters and saturated carbon-chain methyl esters.

[0028] Excessive water content, insufficient urea dosage and high freezing temperature will result in insufficient separation of saturated fatty acid methyl esters. In order to effectively improve the separation efficiency of saturated fatty acid methyl ester, the present invention has carried out the reasonable control of the consumption of each reagent and temperature, preferably, the mass ratio of described urea and methyl oleate raw material is m 尿素 :m 油酸甲酯 =3~8:1, where m 尿素 is the mass of urea, m 油酸甲酯 is the mass of methyl oleate. Th...

Embodiment 1

[0034] Example 1: 2.4kg water content is 25% isopropanol solution is added in the reactor of 10L, then add 0.4kg typical methyl oleate and 1.2kg urea successively, heat to 80 ℃ and make urea dissolve, cool to Crystallized at -10°C, filtered to remove crystals, and then distilled to remove the solvent to obtain intermediate product A.

Embodiment 2

[0035] Example 2: Add 4.0kg of ethanol solution with a water content of 15% into a 10L reactor, then add 0.2kg of typical methyl oleate and 1.0kg of urea in turn, heat to 70°C to dissolve the urea, and cool to -20 °C to crystallize, remove the crystals by filtration, and then distill off the solvent to obtain the intermediate product B.

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Abstract

The invention discloses a preparation method of high-purity methyl oleate, and relates to the technical field of purification of methyl oleate. The preparation method comprises the following steps: adding urea and methyl oleate raw materials into a low-carbon alcohol solution, heating and dissolving to obtain a uniform solution, cooling and freezing the uniform solution, separating out a urea inclusion of low-carbon chain methyl ester and saturated carbon chain methyl ester, filtering to remove the urea inclusion, distilling and concentrating the filtrate to obtain a concentrate of methyl oleate and methyl linoleate, dissolving the concentrate into naphthane, then adding maleic anhydride and iodine, heating to react until methyl linoleate in the concentrate generates C22 tribasic carboxylic acid methyl ester, adding a sodium hydroxide solution, distilling the reaction solution obtained in the S3, removing the solvent naphthane, and filtering to remove the C22 sodium tricarboxylate, thereby obtaining the high-purity methyl oleate. Saturated fatty acid methyl ester in methyl oleate is removed through a urea inclusion method, then polyunsaturated fatty acid methyl ester is removed through a reaction method, and therefore high-purity methyl oleate is obtained.

Description

technical field [0001] The invention relates to the technical field of purification of methyl oleate, in particular to a method for preparing high-purity methyl oleate. Background technique [0002] As an important fine chemical product and raw material, methyl oleate mainly comes from animal and vegetable oils. However, unrefined methyl oleate, whether from vegetable or animal fats, is a mixture of a series of methyl oleates with different carbon chains, such as methyl laurate, methyl myristate, methyl palmitate , a mixture of methyl stearate, methyl oleate, and methyl linoleate. However, methyl esters with saturated carbon chains have a high melting point, and their subsequent esterification products also have the disadvantage of being easy to solidify at room temperature. Methyl esters with polyunsaturated carbon chains such as methyl linoleate and its products have the disadvantage of being easily oxidized, which will lead to a darker color of the product. These short...

Claims

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Application Information

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IPC IPC(8): C07C69/58C07C67/48C07C67/60C07C67/54C07C67/52
CPCC07C67/48C07C67/60C07C67/54C07C67/52C07C69/58
Inventor 夏冶王元超
Owner 杭州国盛新材料科技有限公司
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