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Method for preparing in-situ silver-carried natural zeolite deiodinating adsorbent

A natural zeolite and adsorbent technology, applied in chemical instruments and methods, silicate, inorganic chemistry, etc., can solve the problems of high production cost, easy crushing and pulverization, complex preparation process, etc., and achieve easy quality, low cost, The effect of simple preparation process

Inactive Publication Date: 2006-03-08
FUDAN UNIV +1
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Problems solved by technology

Moreover, the above-mentioned technological process is more complicated, and the production cost is higher
In actual use, these two deiodination adsorbents with high silver loading have good deiodination effect and long life expectancy, but the preparation process is relatively complicated and there are many quality control links.
Because of the low strength of the formed particles, it is easy to break and pulverize when used in acetic acid for a long time, reducing its actual service life

Method used

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  • Method for preparing in-situ silver-carried natural zeolite deiodinating adsorbent
  • Method for preparing in-situ silver-carried natural zeolite deiodinating adsorbent
  • Method for preparing in-situ silver-carried natural zeolite deiodinating adsorbent

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Embodiment Construction

[0028] The present invention comprises the following steps:

[0029] 1. Direct ammonium or acid exchange of raw ore:

[0030] Ammonium exchange: exchange 0.5-1.0mm raw ore zeolite with 0.5-2mol / l ammonium salt solution, the solid-to-liquid ratio is 1:10, heat to 95-100°C and reflux for 2 hours, exchange four times, wash with water, and dry.

[0031] Acid exchange: exchange 0.5-1.0mm granular raw ore zeolite with 0.5-1.0mol / l acid solution, the solid-liquid ratio is 1:10, stir at room temperature to 100°C for 2 hours, exchange 3-4 times, wash with water and dry .

[0032] 2. Silver loading

[0033] For the zeolite after the above-mentioned ammonium or acid exchange, use 0.01~1.5mol·dm -3 Left and right silver nitrate or silver acetate solution at room temperature ~ 110°C, space velocity 0.5 ~ 6hr -1 conditions, exchange for 5 to 48 hours to make it fully loaded with silver, and then the in-situ silver-loaded natural zeolite deiodination adsorbent can be made. See Table 1 a...

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Abstract

The preparation method includes the following steps: breaking natural zeolite core into natural zeolite granules with 20-40 meshes, in-situ making ion exchange to obtain hydrogen-type natural zeolite, the using silver solt solution to make exchange so as to obtain deiodination adsorbing agent.

Description

technical field [0001] The invention relates to a preparation method of a deiodination adsorbent, in particular to a preparation method of an in-situ silver-loaded natural zeolite deiodination adsorbent. Background technique [0002] Methanol low-pressure oxo synthesis process, because iodide is used as a catalytic promoter, iodide or its derivatives inevitably exist in the produced acetic acid. After traditional distillation, rectification or treatment with certain chemicals, there will still be traces of iodide or its derivatives that are difficult to remove. Its existence limits the application of the acetic acid produced by this method. In particular, it cannot be used in the production process using iodine-sensitive metals as catalysts. For example, in the production process of vinyl acetate, the total iodine content is required to be lower than 10ppb. [0003] US Patent No. 4,615,806 proposes to remove iodide in acetic acid with a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30
Inventor 龙英才张玲妹夏晓慧高蕾孙飞程晓维
Owner FUDAN UNIV
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