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Method for selectively adsorbing and separating acetophenone and alpha-methyl benzyl alcohol

A methyl benzyl alcohol, adsorption separation technology, applied in the separation/purification of hydroxyl compounds, separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problem of relatively low volatility, difficult separation, high energy consumption, etc. problems, to achieve the effect of stable repeated use performance, simple and gentle separation process

Inactive Publication Date: 2013-09-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the molecular structure and physical properties of acetophenone and α-methylbenzyl alcohol are very close. For example, the boiling point of acetophenone is 202°C, and the boiling point of α-methylbenzyl alcohol is 204°C. The difference between the boiling points at normal pressure is only 2 °C, the relative volatility is very small, and it is easy to form azeotropes under normal pressure or reduced pressure. It takes a lot of energy to separate them by means of rectification
Moreover, the freezing points of the two are also very close (both at 20°C), and it is difficult to separate the two by melting crystallization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 1.135 g of β-cyclodextrin into 25 mL of aqueous solution containing 5 g / L acetophenone and 5 g / L α-methylbenzyl alcohol. The ethyl ester elutes acetophenone and α-methylbenzyl alcohol adsorbed on β-cyclodextrin. Detected by gas chromatography, the adsorption amounts of acetophenone and α-methylbenzyl alcohol on β-cyclodextrin were 0.1055 g and 0.0505 g respectively, and the contents of acetophenone and α-methylbenzyl alcohol in the residual liquid were respectively 0.78 g / L and 2.98 g / L, and the adsorption separation factor was 9.05.

Embodiment 2

[0023] Put 1.135 g of β-cyclodextrin into 25 mL of aqueous solution containing 8 g / L acetophenone and 8 g / L α-methyl benzyl alcohol. The ethyl ester elutes acetophenone and α-methylbenzyl alcohol adsorbed on β-cyclodextrin. Detected by gas chromatography, the adsorption amounts of acetophenone and α-methylbenzyl alcohol on β-cyclodextrin are respectively 0.1490 g and 0.0334 g, and the contents of acetophenone and α-methylbenzyl alcohol in the residual liquid are respectively 2.04 g / L and 6.66 g / L, and the adsorption separation factor was 14.56.

Embodiment 3

[0025] Put 1.135 g of β-cyclodextrin into 25 mL of water / ethanol solution containing 15 g / L acetophenone and 15 g / L α-methylbenzyl alcohol, vibrate and filter at 30°C under normal pressure , acetophenone and α-methylbenzyl alcohol adsorbed on β-cyclodextrin were eluted with ethyl acetate. Detected by gas chromatography, the adsorption amounts of acetophenone and α-methylbenzyl alcohol on β-cyclodextrin were 0.1362 g and 0.0314 g respectively, and the contents of acetophenone and α-methylbenzyl alcohol in the residual liquid were respectively 9.55 g / L and 13.74 g / L, and the adsorption separation factor was 6.23.

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PUM

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Abstract

The method discloses a method for selectively adsorbing and separating acetophenone and alpha-methyl benzyl alcohol. Based on the characteristics of the difference of the adsorption capacity of beta-cyclodextrin to the acetophenone and the alpha-methyl benzyl alcohol, the insolubility of the beta-cyclodextrin in a mixing solution of the acetophenone and the alpha-methyl benzyl alcohol and the like, the purpose of separation and purification is realized by performing preferential adsorption on the acetophenone under an moderate condition by taking the beta-cyclodextrin as an adsorbent. The method is moderate in separation condition, good in separation effect, simple in process, energy-saving, environmental-friendly and the like; and the adsorbent can be used repeatedly.

Description

[0001] technical field [0002] The present invention relates to the separation technology of acetophenone and α-methyl benzyl alcohol, in particular to a method for selective adsorption separation of acetophenone and α-methyl benzyl alcohol. Background technique [0003] Acetophenone and α-methylbenzyl alcohol (also known as 1-phenylethanol) are important organic chemical raw materials, widely used in fragrances, flavors, medicines, etc. Acetophenone has similar fragrances such as almond, cherry, honeysuckle, jasmine and strawberry, so it can be used as a fragrance additive, and it is also an important raw material for synthetic pharmaceutical products; α-methylbenzyl alcohol can also be widely used in medicine and Spice and other industries. Some crude raw materials, by-products and wastes of many petrochemical enterprises contain a large amount of acetophenone and α-methyl benzyl alcohol, the total content of which is more than 90%. For example, the by-products of styren...

Claims

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Application Information

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IPC IPC(8): C07C49/78C07C45/79C07C33/22C07C29/76
Inventor 纪红兵柴坤刚
Owner SUN YAT SEN UNIV
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