Technology of extractive distillation separation of ethyl acetate-ethanol-water

A technology of ethyl formate and extractive distillation, which is applied in the field of extractive distillation technology, can solve the problems of waste of resources, inability to use ordinary rectification to separate, environmental pollution, etc.

Active Publication Date: 2012-08-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A large number of intermediate products produced in the pharmaceutical industry are mixtures of ethyl formate, ethanol, and water, but because of the azeotrope formed between them (ethanol and water azeotrope, ethyl formate and water azeotrope), ordinary distillation cannot be used. The method separates the two, which not only wastes resources, but also easily causes environmental pollution.
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Method used

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  • Technology of extractive distillation separation of ethyl acetate-ethanol-water
  • Technology of extractive distillation separation of ethyl acetate-ethanol-water
  • Technology of extractive distillation separation of ethyl acetate-ethanol-water

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1: the number of trays of extractive distillation tower 1 is 45, and tower diameter is 600mm, and operating pressure is 101.325KPa, and the number of trays of ethyl formate recovery tower 2 is 45, and tower diameter is 400mm, and operating pressure is 101.325KPa , the number of trays of the extraction agent recovery tower 3 is 40, the tower diameter is 400mm, and the operating pressure is 12.5KPa.

[0030] The extractant 11 (at a temperature of 30° C.) is continuously added to the extractive distillation column 1 from the 9th tray at a flow rate of 500 kg / h, and the raw material solution 10 (50% ethyl formate (mass fraction, the same below), 40% ethanol , water 10%, temperature 30 DEG C) with the flow rate of 1000kg / h from the 27th plate continuously into the extractive distillation column 1, the steam rising from the top of the extractive distillation column 1 is condensed by the condenser 5 at the top of the extractive distillation column 1 , the operating ...

Embodiment 2

[0034] Embodiment 2: the number of trays of extractive distillation tower 1 is 45, and tower diameter is 800mm, and operating pressure is 101.325KPa, and the number of trays of ethyl formate recovery tower 2 is 45, and tower diameter is 600mm, and operating pressure is 101.325KPa , the number of trays of the extraction agent recovery tower 3 is 40, the tower diameter is 600mm, and the operating pressure is 12.5KPa.

[0035] The extractant 11 (at a temperature of 30° C.) is continuously added to the extractive distillation column 1 from the 9th tray at a flow rate of 1000 kg / h, and the raw material solution 10 (50% ethyl formate (mass fraction, the same below), 40% ethanol , water 10%, temperature 30 DEG C) with the flow rate of 2000kg / h from the 27th plate continuously into the extractive distillation tower 1, the steam rising from the top of the extractive distillation tower 1 is condensed by the condenser 5 at the top of the extractive distillation tower 1 , the operating re...

Embodiment 3

[0039] Embodiment 3: the number of trays of extractive distillation tower 1 is 45, and tower diameter is 600mm, and operating pressure is 101.325KPa, and the number of trays of ethyl formate recovery tower 2 is 45, and tower diameter is 400mm, and operating pressure is 101.325KPa , the number of trays of the extraction agent recovery tower 3 is 40, the tower diameter is 400mm, and the operating pressure is 12.5KPa.

[0040] The extractant 11 (at a temperature of 30° C.) is continuously added to the extractive distillation column 1 from the 9th tray at a flow rate of 500 kg / h, and the raw material solution 10 (50% ethyl formate (mass fraction, the same below), 30% ethanol , water 20%, temperature 30 DEG C) with the flow rate of 1000kg / h from the 27th plate continuously into the extractive distillation column 1, the steam rising from the top of the extractive distillation column 1 is condensed by the condenser 5 at the top of the extractive distillation column 1 , the operating ...

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Abstract

The invention belongs to the extractive distillation process, in particular to a technology of extractive distillation separation of ethyl acetate-ethanol-water. The technology employs glycol as an extractant and joint operation of three tower model including a dehydration tower, a ethyl formate recovery tower and a glycol recovery tower to separate the three substances. The invention can ensure recycling of the extractant. A tower top 2 of the ethyl formate recovery tower obtains 90.7% of ethyl formate, a yield near 100%, and 99.6% of ethanol. Both ethyl formate and ethanol are able to be recycled, s as to save resources, reduce environmental pollution and produce enormous economic benefits.

Description

Technical field: [0001] The invention belongs to an extraction and rectification process, in particular to a process for extracting and rectifying separation of ethyl formate-ethanol-water. Background technique [0002] Ethyl formate, also known as ethyl formate. Colorless low viscosity liquid. Used as a solvent for nitrocellulose, cellulose acetate, etc. It is also used as a fungicide, larvicide and fumigant for food, cigarettes, cereals, dried fruits, etc. It has fragrance and can be used as food essence. It is also an intermediate of organic synthesis. Ethanol is an important industrial solvent, widely used in medicine, paint, cosmetics, oil and other industries. At the same time, it is also an important organic chemical raw material for the synthesis of acetaldehyde, ether, ethyl acetate, etc. It can also be used as a cleaning agent, extractant, antifreeze and disinfectant. [0003] Ethanol and water, ethyl formate and water azeotrope, azeotropic point and composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/06C07C67/54C07C31/08C07C29/84
Inventor 王洪海李春利郭佳佳张剑张文林王荣良
Owner HEBEI UNIV OF TECH
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