Method for purifying ethyl acetate

An ethyl acetate, purification method technology, applied in chemical instruments and methods, carboxylate preparation, organic chemistry and other directions, can solve the problems of complicated operation steps, long time, high cost, and achieve a safe and simple purification process, stable quality, high yield effect

Inactive Publication Date: 2012-10-17
TAICANG HUSHI REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a purification method of ethyl acetate, to overcome the disadvantages of low purity of ethyl acetate purification products in the prior art, cumbersome operation steps, long time and high cost

Method used

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  • Method for purifying ethyl acetate

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Experimental program
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Effect test

Embodiment 1

[0019] Add 1000ml of industrial ethyl acetate into a 2000ml three-neck flask equipped with rectification device, thermometer, heating and stirring device, add 20ml of sodium sulfite solution with a mass fraction of 4% and 10ml of saturated calcium chloride solution in turn, and stir for 10min to remove Organic impurities in ethyl acetate, then add 50g of anhydrous potassium carbonate, heat and reflux for 1h, then add 40g4A molecular sieves for adsorption and purification for 20min, and finally carry out rectification and collection at a flow rate of 20mL / min to obtain 907ml of purified ethyl acetate, the yield It is 90.7%, and the purity is 99.53%.

Embodiment 2

[0021] Add 1000ml of industrial ethyl acetate into a 2000ml three-necked flask equipped with rectification device, thermometer, heating and stirring device, add 25ml of sodium sulfite solution with a mass fraction of 5% and 15ml of saturated calcium chloride solution in turn, and stir for 15min to remove Organic impurities in ethyl acetate, then add 60g of anhydrous potassium carbonate, heat and reflux for 1.5h, then add 50g4A molecular sieves for adsorption and purification for 25min, and finally carry out rectification and collection at a flow rate of 15mL / min to obtain 919ml of purified ethyl acetate, collected The rate is 91.9%, and the purity is 99.78%.

Embodiment 3

[0023] Add 1000ml of industrial ethyl acetate into a 2000ml three-neck flask equipped with rectification device, thermometer, heating and stirring device, add 30ml of sodium sulfite solution with a mass fraction of 6% and 20ml of saturated calcium chloride solution in turn, and stir for 20min to remove Organic impurities in ethyl acetate, then add 70g of anhydrous potassium carbonate, heat and reflux for 2h, then add 60g4A molecular sieves for adsorption and purification for 30min, and finally carry out rectification and collection at a flow rate of 10mL / min to obtain 927ml of purified ethyl acetate, the yield It is 92.7% and the purity is 99.91%.

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Abstract

The invention discloses a method for purifying ethyl acetate, which comprises the steps of: sequentially adding 4-6wt% sodium sulfite solution and saturated calcium chloride solution into industrial-grade ethyl acetate serving as a raw material; stirring to remove organic impurities in ethyl acetate; then sequentially adding anhydrous potassium carbonate for drying and 4A molecular sieve for adsorbing and purifying; and finally collecting purified ethyl acetate by a rectification method, wherein the purity of ethyl acetate purified by the method is more than 99.5%. Compared with the prior art, the method is safe, simple and convenient in the purification process, and can save energy and reduce emission; after being treated, the added purifying agent can be recycled, so that the method is in accordance with the requirements of green chemical industry and environmental protection; and the ethyl acetate product purified by the method is stable in quality and high in purity, and has the prospect of industrial production.

Description

technical field [0001] The invention relates to a method for purifying ethyl acetate, in particular to a method for purifying ethyl acetate with a mass fraction of 4-6% sodium sulfite solution, saturated calcium chloride solution, anhydrous potassium carbonate and 4A molecular sieve. Background technique [0002] Ethyl acetate is a colorless transparent liquid with a fruity aroma, volatile, sensitive to air, and able to absorb moisture, which can decompose slowly and become acidic. Miscible with chloroform, ethanol, acetone and ether, soluble in water (10ml / ml). Can dissolve certain metal salts (such as lithium chloride, cobalt chloride, zinc chloride, ferric chloride, etc.). The relative density is 0.902, the melting point is -83°C, the boiling point is 77°C, the refractive index is 1.3719, and the flash point is 7.2°C (cup open). Flammable, vapor can form explosive mixture with air. Irritant, the median lethal dose (rat, oral) 11.3ml / kg. As an extractant, many compound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/60C07C67/56
Inventor 王伟顾小焱吕明王永旗
Owner TAICANG HUSHI REAGENT
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