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Refining method of isopropenyl acetate

A technology of propylene acetate and a refining method, applied in the field of rectification, can solve problems such as inability to meet large-scale continuous production, inability to achieve high product purity, poor product quality repeatability, etc., and to overcome low production capacity and reduced energy consumption. , The effect of large operation flexibility

Inactive Publication Date: 2009-03-25
SHANGHAI WUJING CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the present invention overcomes the low production capacity, long production cycle, poor repeatability of product quality and the inability to meet large-scale continuous production in the refining method of existing isopropenyl acetate, or the purity of the final product cannot be obtained. To achieve high purity, or the defects of large investment, high energy consumption and large amount of waste water, a refining method of isopropenyl acetate is provided by adopting the method of double tower series connection and side line discharge

Method used

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  • Refining method of isopropenyl acetate

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Effect test

Embodiment 1

[0031] The composition of crude isopropenyl acetate is: 70wt% isopropenyl acetate, 20wt% acetone, 5wt% acetic acid and 5wt% acetic anhydride. The operating conditions are:

[0032] (1) The first distillation tower, 55 theoretical plates, reflux ratio 4, tower top 10kPa (atmospheric pressure), tower bottom temperature 104℃, tower top temperature 60℃, tower bottom control acetone content 0.1%, feed position It is the 25th plate from the top of the tower;

[0033](2) The second distillation tower, 55 theoretical plates, reflux ratio 4, tower top pressure is -60kPa gauge pressure, tower bottom temperature is 101℃, tower top temperature is 70℃, and the feed position is calculated from the top of the tower On the 35th tray, the position where isopropylene acetate is extracted from the liquid phase side line of the rectifying section of the rectification tower is the 10th tray, and the temperature of the side line for extracting isopropylene acetate is 75°C.

[0034] After analysis, the ...

Embodiment 2

[0036] The composition of crude isopropenyl acetate is 70wt% isopropenyl acetate, 20wt% acetone, 5wt% acetic acid and 5wt% acetic anhydride, and the operating conditions are:

[0037] (1) The first distillation tower, 55 theoretical plates, reflux ratio 4, tower top 10kPa (atmospheric pressure), tower bottom temperature 96℃, tower top temperature 56℃, tower bottom control acetone content 1%, feed position It is the 25th plate from the top of the tower;

[0038] (2) The second distillation tower, 55 theoretical plates, reflux ratio 4, tower top pressure is -60kPa gauge pressure, tower bottom temperature is 101℃, tower top temperature is 70℃, and the feed position is calculated from the top of the tower On the 35th tray, the position where isopropylene acetate is extracted from the liquid phase side line of the rectifying section of the rectification tower is the 10th tray, and the temperature at which the isopropylene acetate is extracted from the side line is 75°C.

[0039] After ...

Embodiment 3

[0041] The composition of crude isopropenyl acetate is 70wt% isopropenyl acetate, 20wt% acetone, 5wt% acetic acid and 5wt% acetic anhydride, and the operating conditions are:

[0042] (1) The first rectification tower, 55 theoretical plates, reflux ratio of 4, tower top 10kPa (atmospheric pressure), tower bottom temperature of 92℃, tower top temperature of 56℃, tower bottom control acetone content of 4% , The feed position is the 25th tray from the top of the tower;

[0043] (2) The second rectification tower, 55 theoretical plates, reflux ratio of 5, top pressure of gauge pressure -60kPa, bottom temperature of 101℃, top temperature of 69℃, the feed position is from the top of the tower Counting from the 35th tray, the position where isopropenyl acetate is extracted from the liquid phase side line of the rectification tower is the 10th tray, and the temperature of the side line to extract isopropenyl acetate is 75 ℃.

[0044] After analysis, the acetone content obtained from the t...

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Abstract

The invention discloses a refining method of isopropenylacetate, which comprises the steps that: an isopropenylacetate crude product is rectified by a first rectifying tower to remove most low-boiling residues to obtain tower bottoms, then the tower bottoms are rectified by a second rectifying tower, and the isopropenylacetate elaboration product is extracted from the liquid phase lateral line discharging materials of the rectifying section of the second rectifying tower. The invention overcomes the defects of the current isopropenylacetate refining method that production capacity is low, the production period is long, the product quality repetitiveness is poor and large-scale series production can not be dissatisfied, or final products can not reach high purity, or investment is large, energy consumption is high and large amount of wastewater is generated, and provides the refining method of the isopropenylacetate. The method can be suitable for large-scale series industrial production, does not need additional components such as entrainer and the like, and has the advantages of simple step, low energy consumption, small loss and high product purity.

Description

Technical field [0001] The invention relates to the technical field of rectification, in particular to a method for refining isopropenyl acetate. Background technique [0002] Isopropenyl acetate is an important chemical product, which is mainly used as a refined solvent for Fructinolate (also known as Fructinolate, Fructinolide Acetate or Fluocinolone Acetate), as a solvent for Fructinolate Ointment, or electronic grade solvent. As an excellent acetylation reagent, isopropenyl acetate can react with enol compounds to obtain enol esters, or be converted into its isomer acetylacetone, and is often used in the synthesis of medicines and intermediates. [0003] Isopropenyl acetate is obtained by reacting acetone with ketene in the presence of a catalyst. After the catalyst is separated and removed, the conventional isopropenyl acetate refining process mainly has three methods: batch distillation, continuous vacuum distillation or adding co Rectification of boiling components. [000...

Claims

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Application Information

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IPC IPC(8): C07C69/145C07C67/54
Inventor 曾义红叶小鹤李亭朱家文杨志东
Owner SHANGHAI WUJING CHEM
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