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Method for removing iodine and iodine compound impurity

A compound and impurity technology, applied in the field of iodine and iodide impurities, adsorbents to remove iodine-containing media, can solve the problem of high price, and achieve the effects of high exchange rate, high structural and chemical stability, and high deiodination efficiency

Inactive Publication Date: 2005-03-02
SHANGHAI WUJING CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents are all synthetic zeolite molecular sieves, the price is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The Ag-STI zeolite adsorbent with a silver loading of 5.6% was prepared from natural zeolite Stilbite (structure type code STI) for deiodination test.

[0018] The test was carried out in a constant temperature glass adsorption bed with an inner diameter of 14mm and a height of 150mm, and about 10 grams of adsorbent with a particle size of 10-20 meshes inside. Total iodine content 500ppm in experiment acetic acid liquid, I 有机 / I 无机 =1, the temperature is 45°C. Use a peristaltic metering pump to feed the experimental acetic acid solution into the adsorption bed from bottom to top, with a space velocity of 4 / hr -1 . Use silver nitrate solution to generate silver iodide precipitation reaction to test that the deiodination effect of the adsorbent is invalid, that is, after the adsorption bed is penetrated, the silver-containing zeolite adsorbent in the adsorption bed is taken out. The amount of Ag and I in the expired adsorbent was measured by EDX, and the total deiodin...

Embodiment 2

[0021] The deiodination experiment was carried out with the Ag-STI adsorbent with a silver loading of 14.8%.

[0022]

Embodiment 3

[0024] The deiodination experiment was carried out with Ag-STI adsorbent with 9.8% silver loading.

[0025]

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PUM

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Abstract

The method of removing iodine and iodide impurity features that the medium containing iodide is made to contact with one kind of adsorbent to eliminate its iodide. The adsorbent is prepared with natural mineral zeolite, such as STI, and through modification and cation exchange. The adsorbent is stable in the medium to be processed and can eliminate organic and inorganic iodide and molecular iodine from the medium effectively. The adsorption conditions include temperature of 18-100 deg.c, and liquid space velocity of 1-20 / hr and the processed liquid has total iodine content less than 10 ppb.

Description

technical field [0001] The invention relates to a method for removing iodine-containing medium, in particular to a method for removing iodine-containing medium with an adsorbent made of natural zeolite. Specifically, it relates to the removal of iodine and iodide contained in the product carboxylic acid or carboxylic anhydride prepared from alcohol, olefin or ester as a raw material with rhodium as a catalyst, methyl iodide as a promoter, and alcohol, olefin or ester as a raw material in the process of removing carbonylation. impurity method. The inorganic adsorbent is loaded with at least 2% of one or more metal cations among mercury, silver, palladium and the like. Background technique [0002] The iodine-containing medium is a non-aqueous organic medium, such as carboxylic acid and or carboxylic anhydride, especially in the carbonylation process, using rhodium as a catalyst, methyl iodide as a cocatalyst, and alcohol, olefin or ester as a raw material. The product is ca...

Claims

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Application Information

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IPC IPC(8): B01D15/00C07C51/47
Inventor 张玲妹龙英才曹智龙夏晓慧李彩云高蕾孙飞杨波
Owner SHANGHAI WUJING CHEM
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