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Method for reclaiming aliphatic carboxylic acid

A technology of aliphatic carboxylic acid and aliphatic carboxylic acid ester, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of large steam consumption, reduce the circulation volume, reduce the consumption, solve the problem of high steam consumption, etc. The effect of a large amount of steam

Inactive Publication Date: 2009-09-09
ACTION PERFECT ENG XIAMEN
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  • Abstract
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AI Technical Summary

Problems solved by technology

Because the traditional aliphatic carboxylic acid recovery method directly introduces all the mixture streams to be separated in the aromatic carboxylic acid manufacturing process into the azeotropic distillation tower for azeotropic distillation, the steam consumption is relatively large

Method used

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  • Method for reclaiming aliphatic carboxylic acid
  • Method for reclaiming aliphatic carboxylic acid

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Experimental program
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Effect test

Embodiment

[0060] For the specific process of the embodiment, please refer to figure 2 , the amount of material in the present embodiment is based on parts by mass.

[0061] In the stream 11 of the mixture to be separated, the feed amount of the mixture per unit time contains 70.8 parts of acetic acid, 60.75 parts of water, 0.1 part of p-xylene, and 0.3 part of methyl acetate.

[0062] In the stream 14 of the mixture to be separated, the feed amount of the mixture per unit time contains 256.6 parts of acetic acid, 132.15 parts of water, 0.35 parts of p-xylene, and 8.3 parts of methyl acetate.

[0063] The extraction tower 1 is a plate tower, and the mixture flow 11 is fed from the upper part of the extraction tower 1.

[0064] Stream 42 provides the extraction agent isobutyl acetate required for extraction, and the supply content of isobutyl acetate is 271.4 parts.

[0065] The operating conditions of the extraction tower 1 are selected at a temperature of 40-50°C and an operating pre...

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Abstract

The invention provides a method for reclaiming aliphatic carboxylic acid, which comprises the following steps: feeding a mixture to be separated in an extraction tower, and extracting and separating the mixture by an extracting agent to obtain tower top components comprising the aliphatic carboxylic acid and the extracting agent and tower bottom solution with large water content; and adding the components obtained at the extraction tower top into an azeotrope tower, and treating the components by azeotropic distillation under the action of an azeotropic agent to obtain the tower bottom solution of which main component is the aliphatic carboxylic acid and tower top distillate of which main components are water and the azeotropic agent, wherein the main components of the mixture are the water and the aliphatic carboxylic acid. By using the extraction technology, the method reduces the content of the water in a feeding material of the azeotrope tower, namely, reduces the total amount of the water to be distilled, thereby achieving the aim of saving the using amount of azeotropic distillation vapor.

Description

technical field [0001] The invention relates to a combined application method of extraction technology and azeotropic distillation technology, in particular to a method for recovering aliphatic carboxylic acid by combined application of extraction technology and azeotropic distillation technology. Background technique [0002] In the manufacture of aromatic carboxylic acids, aromatic monocarboxylic acids, aromatic dicarboxylic acids, and aromatic tricarboxylic acids are usually produced from monoalkylbenzenes, dialkylbenzenes, and trialkylbenzenes through liquid-phase oxidation. Aliphatic carboxylic acids are usually used as dissolving agents for the oxidation reaction of aromatic carboxylic acids. In the oxidation reaction of aromatic hydrocarbons to produce aromatic carboxylic acids through liquid phase oxidation, the catalysts are usually transition metal compounds such as cobalt and manganese, and the cocatalysts are usually It is a bromine compound. The pressure of liq...

Claims

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Application Information

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IPC IPC(8): C07C51/48C07C51/46C07C53/00
Inventor 吴荣汉王荣赐
Owner ACTION PERFECT ENG XIAMEN
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