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Preparation method of high-purity acetic acid

An acetic acid, high-purity technology, applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of high production cost, long process route, and high equipment requirements, and achieve low cost and storage stability. Good, simple process route effect

Active Publication Date: 2012-09-19
SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, the process route of this method is longer, and equipment requirement is high, and production cost is high, will cause the raw material cost that peracetic acid solution is high for the preparation of the peracetic acid solution that does not contain additive, and, the acetic acid product prepared by this method Among them, the content of anion impurities, especially halide ions, is high, and when used to prepare peracetic acid solution without additives, it will lead to poor stability of peracetic acid solution

Method used

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  • Preparation method of high-purity acetic acid
  • Preparation method of high-purity acetic acid

Examples

Experimental program
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Embodiment 1

[0026] The present embodiment provides a kind of preparation method of high-purity acetic acid, comprises the following steps of carrying out successively:

[0027] (1) Molecular sieve impregnation treatment: impregnate molecular sieves (3A-EPG, pore size 3-5A) with silver nitrate absolute ethanol solution with a treatment concentration of 2.3g / L for 24 hours, and dry at 80°C for later use;

[0028] (2) Pass acetic acid through step (1) to impregnate the molecular sieve, control the flow rate of acetic acid to 250L / H, and the molecular sieve treatment life (3 Acetic acid), the content of halogen-based anions in acetic acid can be reduced to less than 1ppb, and the water content in acetic acid can be reduced to less than 0.05%;

[0029] (3) Pass acetic acid through a cation exchange column (styrene-based cation exchange resin, China Strong Acid No. 1) to control the flow rate to 200L / H, and the resin treatment life (3 Acetic acid), the content of calcium, zinc, magnesium, alumin...

Embodiment 2

[0037] This embodiment provides a kind of preparation method of high-purity acetic acid, and its basic steps are identical with embodiment 1, and processing condition is as follows:

[0038] Treatment conditions: molecular sieve immersion time: 36H; concentration of silver nitrate absolute ethanol solution: 2.1g / L;

[0039] Acetic acid (molecular sieve) flow rate: 200L / H; Acetic acid (exchange resin) flow rate: 200L / H;

[0040] Oxidant addition ratio: 0.12%; rectification feed rate: 200L / H;

[0041] Filtration time: 2H.

[0042] Test results: halogen content: 0.5ppb (calculated as chlorine); reducing substance content: 4ppm;

[0043] Water content: 0.03%; cation: 7ppb (the highest content);

[0044] >0.2 micron particle concentration: 18 / ml.

Embodiment 3

[0046] This embodiment provides a kind of preparation method of high-purity acetic acid, and its basic steps are identical with embodiment 1, and processing condition is as follows:

[0047] Treatment conditions: molecular sieve immersion time: 12H; concentration of silver nitrate absolute ethanol solution: 2.5g / L;

[0048] Acetic acid (molecular sieve) flow rate: 300L / H; Acetic acid (exchange resin) flow rate: 300L / H;

[0049] Oxidant addition ratio: 0.24%; rectification feed rate: 100L / H;

[0050] Filtration time: 2H.

[0051] Test results: halogen content: 0.9ppb (calculated as chlorine); reducing substance content: 3ppm

[0052] Water content: 0.05%; cation: 8ppb (the highest content);

[0053] >0.2 micron particle concentration: 20 / ml.

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Abstract

The invention relates to a preparation method of high-purity acetic acid, which performs the following continuous steps on the raw material industrial-grade acetic acid to obtain the high-purity acetic acid: molecular sieve adsorption, cation exchange, chemical oxidation treatment, rectification and cyclic filtration, wherein the molecular sieve is previously impregnated in a 2-4g / L silver nitrate anhydrous alcohol solution, and the pore size is 3-5A; in the molecular sieve adsorption step, the flow rate of the acetic acid passing through the molecular sieve is 100-300L / H; in the cation exchange step, the acetic acid passes through a styrene cation exchange resin column at the flow rate of 100-300L / H; and in the chemical oxidation treatment step, an oxidizer, which accounts for 0.05-1 wt% of the acetic acid, is added into the acetic acid, and the acetic acid and the oxidizer are mixed for 30-60 minutes, and are filtered. The invention has the advantages of simple process route and low cost; and the obtained high-purity acetic acid can be directly used for producing the high-purity peroxyacetic acid solution which is free of additives and has high storage stability.

Description

technical field [0001] The invention relates to a method for preparing high-purity acetic acid, and the obtained high-purity acetic acid is mainly used for the preparation of high-purity peroxyacetic acid. Background technique [0002] Peracetic acid is a colorless liquid with a pungent odor. It is a strong oxidant and is easy to decompose. Under the conditions of alkalinity, reducing substances and metal ions, it will react violently, decompose or even explode. Peracetic acid is an excellent organic peroxide, which has a wide range of applications in many aspects. It has high-efficiency and rapid bactericidal effect, and can quickly kill bacteria, spore fungi, yeast and other germs, so it can be used as a treatment for infectious diseases. , drinking water, food and other disinfectants. During the SARS period and the Wenchuan earthquake epidemic prevention period, peracetic acid played a major role. Peracetic acid also has excellent oxidation properties and can be used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/44C07C51/47C07C51/487C07C51/42C07C407/00C07C409/26
Inventor 王涛刘兵
Owner SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD