Method for refining acetic acid

Abstract

The invention relates to a method for refining high quality of acetic acid, characterized by filling acetic acid -insoluble solid strong oxidizer in adsorption column 1, acetic acid passing the oxidizer for removing the impurity in acetic acid, then acetic acid passing adsorption column 2 filled with alumina and adsorption column 3 filled with active carbon for refining acetic acid again to make the formic acid content in acetic acid be below 50ppm and reduce the content of iodine ion.

Description

1. Technical field:

[0001] The invention relates to a method for refining acetic acid, in particular to a method for refining acetic acid produced by methanol low-pressure carbonylation. 2. Background technology:

[0002] As an important industrial raw material, acetic acid plays an important role in the organic chemical industry. It is widely used in fibers, plasticizers, paints, adhesives, copolymer resins, pharmaceuticals, dyes, food, metal processing and fine organic Chemical synthesis and other industrial fields are an important organic chemical product that has developed rapidly in the world in recent years.

[0003] At present, the methods for producing acetic acid in the world include acetaldehyde oxidation, butane and light oil oxidation, and methanol carbonylation. Among them, the most favorable method is the methanol carbonylation method, which not only has a high productivity of acetic acid, but also reduces the formation of by-product impurities. Therefore, wh...

Examples

Embodiment

[0022] The process flow of the refining process is shown in the accompanying drawing. The product acetic acid is injected into the adsorption column 1 equipped with 108g potassium bromate through a peristaltic pump, and the speed is controlled at 0.24ml / s. The acetic acid passes through the adsorption column 1 from bottom to top, and then enters the adsorption column 1 equipped with 100.51 The adsorption column 2 of g activated carbon enters the adsorption column 3 that 16g activated carbon is housed at last, and the temperature is controlled at 60 ℃ by the heating thermostat 4, and the acetic acid obtained by the adsorption column 3 is the product obtained.

[0023] The acetic acid product that embodiment obtains is carried out product analysis.

[0024] Methyl iodide (ppb)

1. Technical field:

[0001] The invention relates to a method for refining acetic acid, in particular to a method for refining acetic acid produced by methanol low-pressure carbonylation. 2. Background technology:

[0002] As an important industrial raw material, acetic acid plays an important role in the organic chemical industry. It is widely used in fibers, plasticizers, paints, adhesives, copolymer resins, pharmaceuticals, dyes, food, metal processing and fine organic Chemical synthesis and other industrial fields are an important organic chemical product that has developed rapidly in the world in recent years.

[0003] At present, the methods for producing acetic acid in the world include acetaldehyde oxidation, butane and light oil oxidation, and methanol carbonylation. Among them, the most favorable method is the methanol carbonylation method, which not only has a high productivity of acetic acid, but also reduces the formation of by-product impurities. Therefore, wh...

Examples

Embodiment

[0022] The process flow of the refining process is shown in the accompanying drawing. The product acetic acid is injected into the adsorption column 1 equipped with 108g potassium bromate through a peristaltic pump, and the speed is controlled at 0.24ml / s. The acetic acid passes through the adsorption column 1 from bottom to top, and then enters the adsorption column 1 equipped with 100.51 The adsorption column 2 of g activated carbon enters the adsorption column 3 that 16g activated carbon is housed at last, and the temperature is controlled at 60 ℃ by the heating thermostat 4, and the acetic acid obtained by the adsorption column 3 is the product obtained.

[0023] The acetic acid product that embodiment obtains is carried out product analysis.

[0024] Methyl iodide (ppb)

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