Method for separating acetic acid from water

A technology of acetic acid dehydration and acetic acid aqueous solution, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of high operating costs and high energy consumption of acetic acid dehydration, reduce operating costs, improve device operation stability, improve The effect of stability

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there is high energy consumption and high operating costs in the acetic acid dehydration process in the prior art, and a new method for separating acetic acid and water is provided

Method used

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  • Method for separating acetic acid from water
  • Method for separating acetic acid from water
  • Method for separating acetic acid from water

Examples

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Embodiment 1

[0026] Adopt flow process shown in Fig. 1, acetic acid aqueous solution 1 (wherein acetic acid concentration is 38 mass %) enters acetic acid dehydration tower 2 from the middle, after rectifying separation, tower top obtains gaseous phase stream 3, tower still obtains liquid phase stream 7; Stream 3 After heat exchange and condensation in the condenser 4, it is divided into a stream 5 and a stream 6. The stream 5 enters the follow-up process as a tower top product discharge, and the stream 6 returns to the top of the acetic acid dehydration tower 2; It is logistics 9 and logistics 10, logistics 9 returns to the bottom of 2, and logistics 10 enters the subsequent process as the output of the tower kettle product. The concentration of acetic acid in the discharge from the bottom of the acetic acid dehydration tower is greater than 94% by mass, and the concentration of acetic acid in the discharge from the top of the tower is less than 0.1% by mass.

[0027] The heat exchange me...

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Abstract

The invention relates to a method for separating acetic acid from water, which mainly solves the problems of high energy consumption and high operating cost in an acetic acid dehydration process in the prior art. In the invention, distillation and dehydration are carried out by pressurizing an acetic acid dehydration tower, water is used as a heat exchange medium in heat pump circulation, the heat released by condensing the discharged material at the top of the acetic acid dehydration tower is absorbed by a heat exchange medium in a closed heat pump process, the heat exchange medium after absorbing the energy of the discharged material at the top of the tower is compressed by a compressor so as to raise temperature, the high-temperature steam is used for carrying out heat exchange with the discharged material at the bottom of the tower in a tower kettle reboiler, the steam subjected to heat exchange in the tower kettle enters a gas-liquid separation tank after decompression, the separated liquid phase enters a condenser at the top of the tower to carry out heat exchange, and the separated gas phase is mixed with the gas at the outlet of the condenser at the top of the tower to enter the compressor, thereby being used for carrying out heat exchange again with the tower kettle. The technical scheme provided by the invention better solves the problems and can be applied to industrial production for separating acetic acid from water.

Description

technical field [0001] The present invention relates to a method for separating acetic acid and water. Background technique [0002] In the process of oxidizing p-xylene to produce terephthalic acid, acetic acid is usually used as an organic solvent. The large amount of water formed during the oxidation dilutes the acetic acid solvent, which is required in the appropriate concentration for the reaction. In order to ensure the concentration of acetic acid in the solvent, an acetic acid dehydration tower is usually used to separate the excess water in the solvent. With the expansion of production scale, the operating cost of acetic acid dehydration tower is increasing day by day. [0003] Conventional direct rectification dehydration due to relatively low volatility when the concentration of acetic acid is low, the method of increasing the number of trays and increasing the reflux ratio is usually used to reduce the concentration of acetic acid in the top discharge, resultin...

Claims

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Application Information

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IPC IPC(8): C07C53/08C07C51/44
Inventor 李真泽陈迎何勤伟周俊方钟亮黄海波
Owner CHINA PETROLEUM & CHEM CORP
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