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Method for de-iodinating and refining acetic acid

A refining method, acetic acid technology, applied in the separation/purification of carboxylic acid compounds, ion exchange, organic chemistry, etc., can solve the problem that high-quality products cannot meet the quality requirements of high-end users, the content of iodine ion removal is low, and acetic acid cannot be used in acetic acid products Vinyl and other issues

Active Publication Date: 2013-03-27
YANKUANG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The acetic acid product obtained by deiodination according to this treatment process can remove the iodide ion content to the lowest ppm level, and the content of formic acid is less than or equal to 0.03%. Even if it follows the inspection standard of GB / T1628.1-2000, for this standard The high-quality products obtained cannot meet the quality requirements of high-end users, but can only meet the needs of general customers. For example, the production of vinyl acetate requires that the iodide ion content in acetic acid be below 10PPb, and the acetic acid products obtained by this treatment process cannot be used in the production of vinyl acetate. production, so there is an urgent need for a technology that can reduce iodine content in acetic acid finished products

Method used

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  • Method for de-iodinating and refining acetic acid

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Embodiment 1

[0017] After the acetic acid extracted from the rectification tower is cooled to 100°C, it enters the adsorption tower. The pressure in the adsorption tower is 0.2Mpa and the temperature is 40°C. Acetic acid enters the ion exchange tower. The pressure of the ion exchange tower is 0.2Mpa and the temperature is 80°C. After the adsorption of polystyrene ion exchange resin, the iodine in the acetic acid is removed to obtain refined acetic acid. The acetic acid coming out of the ion exchange tower After cooling through a heat exchanger, the temperature drops to 50°C, and then enters a storage tank for storage.

Embodiment 2

[0019] After the acetic acid extracted from the rectification tower is cooled to 100°C, it enters the adsorption tower. The pressure in the adsorption tower is 0.5Mpa and the temperature is 138°C. Acetic acid enters the ion exchange tower, the pressure of the ion exchange tower is 0.5Mpa, and the temperature is 100°C. After the adsorption of polystyrene ion exchange resin, the iodine in the acetic acid is removed to obtain refined acetic acid. The acetic acid coming out of the ion exchange tower After cooling through a heat exchanger, the temperature drops to 30°C, and then enters a storage tank for storage.

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Abstract

The invention belongs to the field of refining chemical products, and particularly discloses a method for de-iodinating and refining acetic acid. The refining method comprises the following steps: absorbing an acetic acid finished product collected from a rectifying tower by an adsorbent or an ion exchange resin; reducing iodine in the acetic acid to below 10PPb; and reducing the content of formic acid to less than or equal to 30PPm. The refined acetic acid product obtained through the refining process meets the requirements of downstream high-end products and the requirements of high-end customers for producing vinyl acetate and the like.

Description

technical field [0001] The invention belongs to the field of refining chemical products, in particular to a method for refining acetic acid deiodination. Background technique [0002] Acetic acid scientific name acetic acid, molecular formula C 2 h 4 o 2 , Acetic acid is an important basic chemical raw material, widely used in chemical industry, light industry, textile, pesticide, medicine, electronics, food and other industries, for the production of vinyl acetate, polyvinyl alcohol, terephthalic acid, acetate, vinegar Anhydrides, etc., with hundreds of derivatives. [0003] The production method of acetic acid is, with carbon monoxide and methyl alcohol as raw material, produces with carbonylation method, the method that adopts at present is methanol low-pressure carbonylation method, and this low-pressure methanol carbonylation method uses rhodium iodide as catalyst, and process reaction condition is gentle, pressure About 3.4MPa, the yield is relatively high, the sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/47B01D15/08
Inventor 张志伟李志远裴学成孙永奎李智吴旭李涛
Owner YANKUANG GRP CO LTD