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Novel process for synthesizing coconut oil fatty acid monoethanol amide

A technology of monoethanolamide and coconut oil fatty acid, applied in the field of surfactants, can solve the problems of high cost, high reaction temperature, and the reaction is not easy to complete, and achieves the effects of mild reaction, high conversion rate, and easy operation.

Inactive Publication Date: 2016-04-27
杨丽莉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are three main synthesis processes of CMA: ① It is prepared by the direct reaction of coconut oil and monoethanolamine. This reaction is not easy to complete, and the product contains glycerin and high free monoethanolamine; The reaction temperature is high, the color of the product tends to become darker, and by-products such as amino esters are produced; ③It is produced by reacting coconut oil with monoethanolamine after methyl esterification, with high reaction conversion rate and high cost, and there are dangerous factors such as methanol treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the reaction equipped with a stirrer and a distillation tower device, weigh 1.2mol of monoethanolamine, 0.5g of sodium ethoxide, and 80ml of absolute ethanol, stir at 60°C to 70°C to dissolve them completely, and then drop them into the reaction system Add 1 mol of coconut oil, control the reaction temperature at 60°C to 90°C, after the dropwise addition, carry out the reflux reaction, and recover the ethanol fraction with a top temperature of 78.1°C at the same time, the reaction time is 6h to 10h, and the reaction is completed, cooling down to obtain solid crude coconut oil fatty acid Monoethanolamide, the obtained crude product is recrystallized with ethanol to obtain a product with a content of 98.8%, and the yield is 90% in terms of coconut oil.

Embodiment 2

[0014] In the reaction equipped with a stirrer and a distillation tower device, weigh 1.15mol of monoethanolamine, 0.4g of sodium ethoxide, and 80ml of absolute ethanol, stir at 60°C to 70°C to dissolve them completely, and then drop them into the reaction system Add 1 mol of coconut oil, control the reaction temperature at 60°C to 90°C, after the dropwise addition, carry out the reflux reaction, and recover the ethanol fraction with a top temperature of 78.1°C at the same time, the reaction time is 6h to 10h, and the reaction is completed, cooling down to obtain solid crude coconut oil fatty acid Monoethanolamide, the obtained crude product is recrystallized with ethanol to obtain a product with a content greater than 98.5%, and the yield is 90.3% in terms of coconut oil.

Embodiment 3

[0016] In the reaction equipped with a stirrer and a distillation tower device, weigh 1.1mol of monoethanolamine, 0.38g of sodium ethoxide, and 80ml of absolute ethanol, stir at 60°C to 70°C to dissolve them completely, and then drop them into the reaction system Add 1 mol of coconut oil, control the reaction temperature at 60°C to 90°C, after the dropwise addition, carry out the reflux reaction, and recover the ethanol fraction with a top temperature of 78.1°C at the same time, the reaction time is 6h to 10h, and the reaction is completed, cooling down to obtain solid crude coconut oil fatty acid Monoethanolamide, the obtained crude product is recrystallized with ethanol to obtain a product with a content greater than 98.9%, and the yield is 90.5% in terms of coconut oil.

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Abstract

The invention discloses a novel process for synthesizing coconut oil fatty acid monoethanol amide. The process is characterized by adopting the technical scheme which comprises the following steps of weighing a certain amount of monoethanolamine, sodium ethoxide and absolute ethyl alcohol in a reaction in which a stirrer and a distillation column measurement device are disposed, and conducting stirring at 60-70 DEG C until the materials are completely dissolved; dropwise adding coconut oil into the reaction system, and controlling the reaction temperature to be 60-90 DEG C; conducting a reflux reaction after dropwise adding is completed while recovering an ethanol fraction having a top temperature of 78.1 DEG C; conducting cooling after the reaction is conducted for 6-10 hours and is completed so as to obtain a solid crude product coconut oil fatty acid monoethanol amide; and recrystallizing the prepared crude product with ethanol to obtain a product which has a content of more than 98.2 percent and has a yield of 90 percent in terms of coconut oil. The method is mild in reaction conditions, simple and convenient to operate, high in conversion rate and low in cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a new process for synthesizing coconut oil fatty acid monoethanolamide, which belongs to the field of surfactants. Background technique [0002] Coconut oil fatty acid monoethanolamide (coconutoilfattyacidmonoethanolamide), referred to as CMA or methyl ester, is a light yellow flake, non-toxic, due to the presence of amide bonds in its molecule, it has good chemical stability in a wide pH range. Stability, excellent dispersing, solubilizing, emulsifying, thickening and lubricating properties. The microbial degradation rate is above 98%. Studies have shown that the free diethanolamine contained in the diethanolamide series of surfactants widely used in liquid detergents has obvious carcinogenic activity. CMA, which is also an alkanolamide nonionic surfactant, can be a substitute for diethanolamide series surfactants, and when used in combination with other surfactants, its performance can surpass that of coconut oil fatty acid...

Claims

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Application Information

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IPC IPC(8): C07C231/02C07C233/18
Inventor 杨丽莉
Owner 杨丽莉
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