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Method for purifying and refining ethyl acetate in high purity

A technology of ethyl acetate and refining methods, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of increasing production costs, increasing energy consumption, etc., and achieve stable operation, stable operating temperature, The effect of lower operating reflux ratio lower limit

Active Publication Date: 2007-04-25
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessively high operating reflux ratio will increase energy consumption and increase production costs

Method used

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  • Method for purifying and refining ethyl acetate in high purity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The feed components and proportion (weight) are: 98.9% ethyl acetate, 1.0% acidity (calculated as acetic acid), 0.08% alcohol (calculated as ethanol), and 0.02% moisture. According to the above requirements, select the stainless steel sheet filler punching and corrugation with material codes 304 and 316L respectively. In the embodiment, three metal trays whose material code is 316L and a kettle-type reboiler with an overflow baffle are used. Feed from the 2nd tray. Refer to Table 1 for the operating index and results of Example 1.

[0022] In the embodiments of the present invention, stainless steel thin plates are used as the packing of the refining tower, which is not a limitation of the present invention, and the protection of the present invention is based on the claims.

[0023] Table 1

[0024]

Embodiment 2

[0026] Feed components and proportioning (weight) are: ethyl acetate 99.1%, acidity (calculated as acetic acid) 0.79%, alcohol (calculated as ethanol) 0.09%, moisture 0.02%, methyl acetate 10ppm. According to the above requirements, select stainless steel sheet fillers with appropriate thickness and material codes 304 and 316L for punching and corrugation. In the embodiment, three metal trays whose material code is 316L and a kettle-type reboiler with an overflow baffle are used. The packing is filled in two stages, and the material is fed from between the two stages of packing. Refer to Table 2 for the operational index and results of Example 2.

[0027] Table 2

[0028] Column type and reboiler type

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Abstract

A process for preparing high-purity ethyl acetate features that the water, ethanol, acetic acid, ethyl acetate and the light component containing aldone and ester are proportionally loaded in the a purifying-refining tower from the chosen position and the operating reflux ratio is controlled to be (0.3-2.5):1.

Description

technical field [0001] The invention relates to a method for producing high-purity ethyl acetate, in particular discloses a method for purifying and refining high-purity ethyl acetate. Background technique [0002] The production of ethyl acetate generally adopts a four-tower process including an esterification reaction distillation tower, a dehydration, alcohol and light component concentration tower, a deacidification and heavy component refining tower, and a wastewater treatment and light component recovery wastewater recovery tower. . After being dehydrated in the concentration tower, the crude product after passing the alcohol and light components often needs to go through the purification tower to remove trace impurity acids, so as to meet higher product quality standards. Most of the traditional refining towers use ceramic packing, which plays a certain role in acid corrosion resistance. However, the specific surface area of ​​ceramics i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/54
Inventor 曾义红齐峻唐素丽张丽琴沈树荣
Owner SHANGHAI HUAYI ENERGY CHEM
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