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A method for removing trace iodide ions in acetic acid

A technology of iodide ion and acetic acid, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc., can solve the problems of high energy consumption, complex process, limited deiodination capacity, etc. the effect of removing

Active Publication Date: 2016-08-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of high energy consumption, complex process, and limited capacity of iodine removal in the existing technology for removing iodide ions, the present invention provides a method for removing trace amounts of iodide ions in acetic acid, specifically in the methanol carbonylation process for acetic acid. In the distillation process, silver, palladium or mercury nitrate or acetate solution is added as a deiodination reagent to remove the iodide ion content in acetic acid to below 1ppb. The nitrate or acetate solution can be its aqueous solution or its Acetic acid solution

Method used

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  • A method for removing trace iodide ions in acetic acid
  • A method for removing trace iodide ions in acetic acid

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Effect test

Embodiment 1～5

[0013] figure 1 It is a heavy component column in the acetic acid production process of methanol carbonylation, which is used to separate acetic acid, propionic acid and other trace impurities with high boiling point. After a series of rectification treatments before the tower, the acetic acid entering the tower contains, for example, 0.1% propionic acid and 0.1% water. The content of iodide ions depends on the entire carbonylation process and is generally between 100ppb and 10ppm. The acetic acid solution that contains impurity enters in the rectifying tower through pipeline 1, and the deiodination reagent solution of the present invention can be joined in pipeline 1 through pipeline 2, enters rectifying tower together with acetic acid solution, or joins through pipeline 3 in the distillation tower. The acetic acid product is extracted from the side line of the pipeline 4 near the top of the tower, and the heavy components such as propionic acid and iodide are discharged at ...

Embodiment 6～8

[0016] Except using 1wt% silver nitrate aqueous solution as deiodination reagent, other conditions are the same as Example 1, and the analysis results are listed in Table 1.

Embodiment 9

[0018] Except using the palladium nitrate aqueous solution of 1wt% as deiodination reagent, other conditions are the same as embodiment 1, and analysis result is listed in table 1.

[0019] Table 1

[0020]

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Abstract

The invention provides a method for removal of trace iodine ions from acetic acid. Specifically, in a rectification process of preparing acetic acid by a methanol carbonylation synthesis technique, a nitrate or acetate solution of silver, palladium or mercury is added as an iodine removal reagent to remove the iodine ions in acetic acid to a content of less than 1ppb. The nitrate or acetate solution can be a water solution or an acetic acid solution thereof. The method involved in the invention is a single-tower iodine removal method. With no need for adding new equipment to the original acetic acid preparation process, the method can effectively remove iodine ions, and also does not affect separation of acetic acid and heavy components in the original process. In addition, the reaction generated iodide of silver, palladium or mercury is discharged from the tower bottom, and can be used for iodine removal repeatedly after regeneration treatment.

Description

technical field [0001] The invention relates to a method for removing trace amounts of iodide ions in acetic acid, in particular to a method for removing trace amounts of iodide ions in the rectification process of acetic acid produced by methanol carbonyl synthesis to obtain high-purity acetic acid. Background technique [0002] Acetic acid is an important basic organic chemical raw material, widely used in chemical industry, pesticide, medicine, national defense, electronics and other industries. Methanol oxo synthesis is the most widely used method in the production of acetic acid. In the 1970s, Monsanto developed a low-pressure carbonylation production process with a rhodium-based catalyst, using methyl iodide as an auxiliary agent. British Petroleum (BP) and Celanese have successively optimized the process, respectively developed the Cativa process with metal iridium as the main catalyst and the AO Plus process with low water content, which greatly increased the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/487C07C51/44
CPCC07C51/44C07C51/487C07C53/08
Inventor 李彤吕顺丰王世亮刘博秦燕璜
Owner CHINA PETROLEUM & CHEM CORP