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Acetic acid refining method for improving acetic acid potassium permanganate test time

A technology of potassium permanganate and test time, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems that saturated aldehydes cannot be decomposed, shorten the test time of potassium permanganate, etc., and extend the time for discoloration Effect

Active Publication Date: 2005-07-06
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some disadvantages when treating with ozone: (1) only saturated compounds can be treated with ozone, and saturated aldehydes cannot be decomposed by treatment with ozone; (2) the decomposition products produced by treating unsaturated compounds with ozone are saturated aldehydes, they still have reducing power, therefore, they are more inferior compounds, still shortening the potassium permanganate test time

Method used

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  • Acetic acid refining method for improving acetic acid potassium permanganate test time

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Experimental program
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Effect test

Embodiment 1

[0025] 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.

Embodiment 2

[0027] The acetic acid product that embodiment 1 obtains is carried out potassium permanganate test, the water of getting 6ml and the acetic acid of 20ml are added test tube, then the potassium permanganate solution of 3ml is added dropwise, after fully shaking, leave standstill, observe its discoloration time.

[0028] The acetic acid product that embodiment 1 obtains is carried out product analysis.

[0029] Methyl iodide (ppb)

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Abstract

The invention relates to a method for removing the reducing impurity in acetic acid and improving the test time of potassium permanganate of acetic acid, characterized by filling acetic acid -insoluble solid strong oxidizer in adsorption column 1, acetic acid passing the oxidizer for removing the reducing 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 and removing water and unsaturated aldehydes in acetic acid. Potassium permanganate test is done for obtaining high quality of acetic acid with good potassium permanganate test time.

Description

1. Technical field: [0001] The invention relates to a method for refining acetic acid, and in particular discloses a method for refining acetic acid which improves the test time of acetic acid potassium permanganate for 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 produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/47C07C53/08
Inventor 刘艳姚颖陆雪花周锦瑛
Owner SHANGHAI HUAYI ENERGY CHEM
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