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Method for separating acetic acid and water

A technology of acetic acid dehydration and acetic acid aqueous solution, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of high energy consumption of acetic acid dehydration and high equipment manufacturing cost

Active Publication Date: 2014-06-04
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 the problem of high energy consumption and high equipment manufacturing cost 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 and water
  • Method for separating acetic acid and water

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Embodiment 1

[0026] use figure 1 As shown in the flow process, the acetic acid aqueous solution 1 (wherein the acetic acid concentration is 38% by mass) enters the acetic acid dehydration tower 2 from the middle, and after being separated by rectification, the gaseous phase stream 3 is obtained at the top of the tower, and the liquid phase stream 7 is obtained at the bottom of the tower; the stream 3 passes through the condenser 4 After heat exchange and condensation, it is divided into logistics 5 and logistics 6. Logistics 5 enters the follow-up process as the tower top product discharge, and logistics 6 returns to the top of acetic acid dehydration tower 2; after the heat exchange of reboiler 8, logistics 7 is divided into logistics 9 And logistics 10, logistics 9 returns to the bottom of 2, and logistics 10 enters the follow-up 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 gre...

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Abstract

The invention relates to a method for separating acetic acid and water, mainly solving the problems in the prior art that the energy consumption is high in acetic acid dehydrating process and equipment manufacturing cost is high. The technical scheme of the method is as follows: rectifying and dehydrating by adding pressure to an acetic acid dehydrating tower; using water as a heat-transfer medium during a heat pump cycle; absorbing heat released from condensation on materials discharged from the acetic acid dehydrating tower top by the heat-transfer medium in a closed heat pump flow; compressing the heat-transfer medium having absorbed the energy of the materials discharged from the tower top by a compressing machine, wherein the temperature of the medium is raised then; desuperheating the high temperature superheated steam by a desuperheating device to form saturated steam, and filling the steam in a tower kettle reboiler to exchange heat with the discharged materials from the tower bottom. The method with the above technical scheme better solves the problems in the prior art, and can be applied in industrial production for separating acetic acid and water.

Description

technical field [0001] The 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, resulting in hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/44
Inventor 何勤伟李真泽陈迎杨军徐涵正姜瀛娟
Owner CHINA PETROLEUM & CHEM CORP
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