Method for separating acetic acid and sec-butyl acetate from reaction products

A technology for sec-butyl acetate and reaction product, which is applied in the field of separating acetic acid and sec-butyl acetate, can solve problems such as low product purity of sec-butyl acetate, and achieve the effects of simplified operation, simple operation process and high separation efficiency

Active Publication Date: 2009-07-15
HUNAN RUIYUAN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects in the above-mentioned prior art that the purity of the sec-butyl acetate product is low due to the mixture of C8 olefins and C8 or more olefins in the final product, a

Method used

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  • Method for separating acetic acid and sec-butyl acetate from reaction products
  • Method for separating acetic acid and sec-butyl acetate from reaction products
  • Method for separating acetic acid and sec-butyl acetate from reaction products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] according to figure 1 The process shown is used to set up the separation device of this embodiment. The azeotropic distillation tower T1 and the azeotropic distillation tower T2 are both stainless steel packing towers with an inner diameter of 50mm. T1 is equipped with a 2.5m φ3 stainless steel θ mesh ring packing (theoretical plate number is 50), and T2 is equipped with a height It is a 3m φ3 stainless steel θ mesh ring packing (theoretical plate number is 60). The T1 tower is equipped with a tower top cooler 11, a phase separator 12, a tower kettle, a tower kettle heater, and a side line opened at the bottom of the tower Pumping outlet; T2 tower is equipped with a tower top cooler 13, a phase separator 14, a tower kettle, a tower kettle heater, and a side-line pumping outlet opened in the lower part of the tower.

[0055] The reaction product with a flow rate of 1000g / h as the feed from line 1 and the influent water with a flow rate of 116g / h (see Table 2 for composition ...

Embodiment 2

[0061] The same separation device as in Example 1 is used, and the same azeotropic distillation tower T1 and the same azeotropic distillation tower T2 as in Example 1 are used.

[0062]The reaction product with a flow rate of 1000g / h as feed from line 1 and feed water with a flow rate of 140g / h (see Table 4 for composition and content) enter the azeotropic distillation tower T1 together, and the stability shown in Table 3 Continuous azeotropic distillation is carried out under the best azeotropic operating conditions. Acetic acid was obtained from the lower part of the azeotropic distillation tower T1, and sec-butyl acetate was obtained from the lower part of the azeotropic distillation tower T2. The composition of the materials at each sampling point was sampled and analyzed. The results are shown in Table 4.

[0063] table 3

[0064]

[0065] Table 4

[0066]

Embodiment 3

[0068] The same separation device as in Example 1 is used, and the same azeotropic distillation tower T1 and the same azeotropic distillation tower T2 as in Example 1 are used.

[0069] The reaction product with a flow rate of 1000 g / h as the feed from line 1 and the influent water with a flow rate of 160 g / h (see Table 6 for composition and content) enter the azeotropic distillation tower T1 together, which is stable as shown in Table 5. Continuous azeotropic distillation is carried out under the best azeotropic operating conditions. Acetic acid was obtained from the lower part of the azeotropic distillation tower T1, and sec-butyl acetate was obtained from the lower part of the azeotropic distillation tower T2. The composition of the materials at each sampling point was sampled and analyzed. The results are shown in Table 6.

[0070] table 5

[0071]

[0072] Table 6

[0073]

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Abstract

The invention provides a method for separating acetic acid and sec-butyl acetate from reaction products for preparing the sec-butyl acetate. The reaction products contain the sec-butyl acetate, the acetic acid and C8 alkene. The method comprises the following steps: under operating condition of azeotropic distillation, allowing water and the reaction products to enter a first azeotrope tower for azeotropic distillation, obtaining an azeotrope from the tower top, and obtaining the acetic acid from the tower bottom; performing oil-water separation on the obtained azeotrope after condensation to obtain an aqueous phase product and an oil-phase product containing the C8 alkene and the sec-butyl acetate; and under the operating condition of azeotropic distillation, allowing the water and the obtained oil-phase product to enter a second azeotrope tower for azeotropic distillation, obtaining the azeotrope from the tower top, and obtaining the acetic acid from the tower bottom. The method can help obtain the high-purity sec-butyl acetate product by separating the reaction products, and recover the high-purity acetic acid; and the method has simple operation process, low energy consumption and lower investment in the whole device.

Description

Technical field [0001] The invention relates to a method for separating acetic acid and sec-butyl acetate from the reaction product for preparing sec-butyl acetate. Background technique [0002] Butyl acetate (including n-butyl acetate, sec-butyl acetate, isobutyl acetate and tert-butyl acetate) is an important class of organic chemicals, which can be widely used as a solvent for paints, artificial leather, plastics, and nitrocellulose. It is also used as a solvent in the reaction process and extraction and separation process, and is also used in the medicine, plastic and perfume industries. Especially in recent years, due to increasingly stringent environmental protection requirements, the use of toxic solvents containing benzene, toluene, and chlorinated hydrocarbons has been restricted, and the amount of environmentally friendly solvents such as esters has increased sharply. Acetate products have become popular products in the market. [0003] At present, the butyl acetate pro...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/54C07C53/08C07C51/46
Inventor 潘罗其甘健
Owner HUNAN RUIYUAN PETROCHEM
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