Regeneration and activation technique of iodine pollution solid adsorbent

A solid adsorbent, regeneration and activation technology, applied in the direction of filter regeneration, combustible gas purification, combustible gas purification/transformation, etc., to achieve high industrialization implementation prospects, reduce deiodination costs, and low concentration effects

Active Publication Date: 2012-05-02
SHANGHAI HUAYI ENERGY CHEM
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  • Claims
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Problems solved by technology

The key to the cost of producing low-iodine acetic acid is the deiodination life of the adsorbent, but in order to effectively prolong the service life of the adsorbent, thereby reducing the cost of deiodination, the regeneration and activation process of the adsorbent to remove harmful organic iodides from the liquid solution has not yet been developed. see the report

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  • Regeneration and activation technique of iodine pollution solid adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The regeneration and activation process of iodine polluted solid adsorbent comprises the following steps successively:

[0030] (1) Cleaning: Place 10 ml of iodine-contaminated solid adsorbent artificially synthesized zeolite molecular sieve ZSM-5 in 1% acetic acid for cleaning for 2 hours and dry;

[0031] (2) Regeneration Under conditions of 1-20° C. and normal pressure, soak the adsorbent treated in the step (1) in a standing state in a 1% sodium thiosulfate solution for 72 hours;

[0032] (3) Activated and then placed in the column, the liquid hourly space velocity is 18h -1 , the temperature is 30 ° C into the active metal Ag + Solution 0.15mol / l silver nitrate carries out ion exchange, until the active metal Ag on the solid adsorbent is polluted by iodine + The concentration reaches the concentration before being polluted again, and then it is washed and dried for deiodination.

Embodiment 2

[0034] (1) Cleaning Change the solid adsorbent polluted by iodine into natural zeolite molecular sieve LZ-210 and place in 0.05% acetic acid to clean for 5h, dry; carry out (2) regeneration, (3) by the same steps as in Example 1 Activation operation.

Embodiment 3

[0036] The step (2) of embodiment 1 is regenerated, and the iodine-contaminated solid adsorbent cleaned through step (1) is placed in the column instead, and the liquid hourly space velocity LHSV is 18h -1 , at a temperature of 18°C, feed 2% sodium thiosulfate solution until the concentration of sodium thiosulfate solution in the effluent tail liquid reaches the inlet concentration, and the appearance of the adsorbent carrier is beige as the new one, so that the iodine-contaminated Pollutants in the effective pores of the adsorbent are all precipitated, no desorption is performed, and other operations are the same as in Example 1.

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Abstract

The invention relates to a regeneration and activation technique of solid adsorbent polluted by iodine, which comprises the following steps in sequence: the solid adsorbent polluted by iodine is placed in 0.01 to 1 percent of acetic acid for cleaning; (2) the cleaned adsorbent is soaked in sodium thiosulfate solution with the concentration of 0.01 to 2 percent in static state or placed in a column and the sodium thiosulfate solution with the concentration of 0.01 to 2 percent is injected for regeneration so as to lead the pollutants in effective pore channels of the adsorbent polluted by iodine to be precipitated completely; (3) then the obtained adsorbent is placed in the column and ion exchange is carried out by injecting active metal Ag+ solution till the concentration of the active metal Ag+ on the solid adsorbent reaches the concentration before the solid adsorbent is polluted. The invention has low energy consumption and convenient operation, in particular to the regenerative technique condition that any heating facility is not used, the concentration of the used regenerative liquid is low and can effectively desorb iodine pollutants; the appearance of the activated adsorbent is same as new carriers, is off white, is characterized by high silver-loaded quantity and high adsorption and effectively prolongs the service life of the adsorbent, thus reducing the cost of iodine desorption.

Description

technical field [0001] The invention relates to a regenerating and activating process of a solid adsorbent, in particular to a regenerating and activating process of an iodine-contaminated zeolite molecular sieve adsorbent. Background technique [0002] In the chemical production industry, especially in the mixture system that is difficult to separate by traditional separation methods, and the removal of trace impurities in gases or liquids, adsorption separation technology is widely used. For example, the residual trace iodide in the acetic acid product synthesized by the low-pressure carbonylation of methanol is difficult to remove by conventional methods, and the conditions are harsh. Adsorption separation is adopted, the operating conditions are mild, and the cost is greatly saved. [0003] However, when the adsorbent and the adsorbate are in contact for a long enough time, the content of the adsorbate in the adsorbent phase and the fluid phase can reach a constant valu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34B01D53/02
Inventor 张玲妹孙飞蔡兰平
Owner SHANGHAI HUAYI ENERGY CHEM
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