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Novel process for removing iodine from acetic acid

An acetic acid and process technology, applied in the field of acetic acid deiodination, can solve problems such as weak adsorption of acetic acid deiodination, secondary pollution, etc., and achieve the effects of avoiding secondary pollution and improving quality

Pending Publication Date: 2022-06-24
英颇瑞智能科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an acetic acid deiodination system and a novel acetic acid iodine removal process, which solves the problems of weak adsorption and easy secondary pollution in acetic acid deiodination

Method used

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  • Novel process for removing iodine from acetic acid

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Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides an acetic acid deiodination system, including a pre-bed device, a deiodination device and a post-bed device, wherein the pre-bed device is filled with cation resin, and in this embodiment, the skeleton of the cation resin includes polyphenylene Vinyl skeleton, the attached group includes sulfonic acid group, specifically, the polystyrene skeleton form of the cation resin of the pre-bed device includes macropores or gel, which can realize the removal of cations in the acetic acid material, and at the same time, avoid In order to affect the deiodination sorbent in the deiodination device (such as deactivating the deiodination sorbent), the stability of the deiodination process is maintained;

[0037] The deiodination device is filled with molecular sieves, wherein the molecular sieves are silver-loaded molecular sieves to realize deiodination treatment;

[0038] The post-bed device is filled with macroporous cation resin for silver removal treatme...

Embodiment 2

[0052] like figure 1 Shown, present embodiment provides a kind of novel acetic acid iodine removal process, is applied to a kind of acetic acid deiodination system in embodiment 1, comprises the steps:

[0053] In step S1, the acetic acid material is introduced into the pre-bed device for processing to remove cations. Specifically, in step S1, the removal of cations is carried out through the sulfonic acid groups attached to the polystyrene skeleton, wherein the removed cations Including Fe3+, Ca2+, avoiding the impact on the deiodination adsorbent in the deiodination device (such as deactivating the deiodination adsorbent), and maintaining the stability of the deiodination process in step S2;

[0054]Step S2, the acetic acid material obtained in step S1 is subjected to deiodination treatment through a deiodination device, specifically, in step S2, deiodination is performed through a silver-loaded molecular sieve, and the iodine content of the acetic acid material after deiodi...

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Abstract

The invention discloses an acetic acid deiodination system and a novel acetic acid deiodination process, the deiodination system comprises a front bed device, a deiodination device and a rear bed device, the front bed device is filled with cation resin, a skeleton of the cation resin comprises a polystyrene skeleton, an attached group comprises a sulfonic acid group, the sulfonic acid group is selected for cation removal, and the deiodination device is used for deiodination. A deiodination adsorbent (silver-loaded molecular sieve) cannot be poisoned and inactivated; the deiodination device is filled with a molecular sieve, and the molecular sieve is a silver-loaded molecular sieve; the rear bed device is filled with macroporous cation resin, and strongly acidic groups are attached to the macroporous cation resin; a skeleton of the macroporous cation resin comprises a polystyrene skeleton, and an attached strongly acidic group comprises sulfonyl-SO3H. According to the rear bed device, silver left in acetic acid can be removed, leaked silver can be effectively recycled, and secondary pollution caused by the fact that silver flows into a product can be effectively avoided; the quality of the acetic acid is further improved, and particularly the quality of the acetic acid subjected to deiodination treatment is improved.

Description

technical field [0001] The invention relates to an acetic acid iodine removal process, in particular to an acetic acid deiodination system and a novel acetic acid iodine removal process, belonging to the technical field of acetic acid deiodination. Background technique [0002] Acetic acid is an important basic industrial raw material, widely used in chemical industry, light textile, medicine and other industries. In the prior art, the production method of acetic acid is mainly the methanol carbonyl synthesis method, which has the advantages of high conversion rate, few by-products and good product quality. However, in the oxo-acetic acid process using methyl iodide and hydrogen iodide as cocatalysts, iodide exists in the whole process of acetic acid production, and a small amount of iodide is inevitably contained in the acetic acid product. Iodine impurities have a poisoning effect on noble metal catalysts, and the iodine content must be reduced to the ppb level (parts per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/08C07C51/42C07C51/47C07C53/08
CPCB01D15/08C07C51/42C07C51/47C07C53/08
Inventor 耿啸天
Owner 英颇瑞智能科技(上海)有限公司