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Phenylethyl acetate synthesis method

A technology of phenylethyl acetate and a synthetic method, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of carbon-based compounds, can solve environmental problems, low yields, waste of resources, etc., and achieve low cost, Reduce energy consumption and production costs, easy to separate the effect

Inactive Publication Date: 2014-02-05
姬学亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because esterification is a reversible reaction and the yield is not high, it is usually used to increase the yield by using excess acetic acid in the reaction. After the reaction, acidic wastewater will be generated, which is likely to cause environmental problems. It must be discharged after neutralization, and consumes a large amount of waste water. Alkali will cause waste of resources

Method used

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  • Phenylethyl acetate synthesis method
  • Phenylethyl acetate synthesis method
  • Phenylethyl acetate synthesis method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In a reaction flask equipped with a stirrer, a reflux condenser, a dropping funnel, and a thermometer, add 42 g of a sodium methoxide solution catalyst with a concentration mass / mass of 30%, and 31 g of ethyl acetoacetate, and stir for 15 minutes. Heat to reflux, add 25.3g of benzyl chloride dropwise, add about 1h, and reflux for 2h to generate ethyl benzyl acetoacetate. Cool to room temperature, add 100ml of water to dissolve and stir well, adjust the pH to 7 with concentrated hydrochloric acid, let it stand for stratification, separate the oily substance in the lower layer, wash with water, and let it stand for stratification again to obtain the product ethyl benzyl acetoacetate.

[0025] Add 60 grams of 5% sodium hydroxide solution to the above product to make the solution alkaline, reflux for 2 hours under stirring, oily matter is formed, cool to below 40°C and add concentrated hydrochloric acid to adjust the pH to 1-2. Continue heating to reflux for 1.5h. The dist...

Embodiment 2

[0028] In a reaction flask equipped with a stirrer, a reflux condenser, a dropping funnel, and a thermometer, add 45 g of a sodium methoxide solution catalyst with a concentration mass / mass of 28%, and 31 g of ethyl acetoacetate, and stir for 15 minutes. Heat to reflux, add 25.3g of benzyl chloride dropwise, add about 1h, and reflux for 3h to generate ethyl benzyl acetoacetate. Cool to room temperature, add 100ml of water to dissolve and stir well, adjust the pH to 7 with concentrated hydrochloric acid, let it stand for stratification, separate the oily substance in the lower layer, wash with water, and let it stand for stratification again to obtain the product ethyl benzyl acetoacetate.

[0029] Add 60 grams of 5% sodium hydroxide solution to the above product to make the solution alkaline, reflux for 3 hours under stirring, oily matter is formed, cool to below 40°C and add concentrated hydrochloric acid to adjust the pH to 1-2. Continue heating to reflux for 2h. The distil...

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Abstract

The invention discloses a phenylethyl acetate synthesis method which comprises the following steps of enabling benzyl chloride serving as a raw material to react with ethyl acetoacetate under the effect of a catalyst to synthesize benzylacetone; then enabling benzylacetone to react with metachloroperbenzoic acid at room temperature to synthesize phenylethyl acetate; adding acid to a water layer to regulate the pH value to 1-2; crystallizing, filtering and recovering m-chlorobenzoic acid. In the method disclosed by the invention, since benzyl chloride is used as a raw material to synthesize phenylethyl acetate, the cost of the raw material is low, the process is simple, and the product is easy to separate; moreover, heating is not needed in a benzylacetone oxidation process, and recovered m-chlorobenzoic acid can be recycled, thus the energy consumption and production cost can be effectively reduced.

Description

technical field [0001] The invention relates to a method for synthesizing and preparing spices, in particular to a method for synthesizing phenethyl acetate. Background technique [0002] Phenylethyl acetate is a kind of spice with peach fruity aroma, mainly used in the preparation of soap, daily cosmetics essence, for the deployment of jasmine, rose, orange blossom, violet, tuberose, briar and other fragrance types. [0003] The latest results of "aromatherapy" research show that the highly diluted and weak aroma of phenylethyl acetate has calming, calming and hypnotic effects, which have been confirmed by brain wave tests and mouse "activity" experiments. Therefore, phenylethyl acetate is expected to be more applied in "aromatherapy" and "aroma health preservation" in the future. [0004] In addition, phenylethyl acetate is also an excellent solvent for resins and inks. [0005] Phenylethyl acetate can be extracted from natural vegetable oils. Because phenylethyl acetat...

Claims

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Application Information

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IPC IPC(8): C07C67/42C07C69/157
CPCC07C45/676C07C67/343C07C67/42C07C69/157C07C49/213C07C69/738
Inventor 姬学亮张镭曹红霞姬红刘双枝师兆忠焦婵
Owner 姬学亮
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