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Macroporous zeolite absorbent and preparation method thereof

A large-pore zeolite and adsorbent technology, which is applied in the field of large-pore zeolite adsorbent and its preparation, can solve the problems of affecting diffusion, small average pore size, and reducing the use efficiency of adsorbent, so as to achieve the advantages of diffusion, uniform distribution of coarse pores, The effect of large average pore size

Inactive Publication Date: 2006-07-26
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the uneven distribution of the amorphous binder among the zeolite powder crystal grains in the adsorbent particles, the average pore size between the zeolite crystal grains is small and the distribution of the coarse pore size is uneven. When the adsorbent is used, it affects the molecules of the adsorbate Diffusion of zeolite grains from the liquid phase into the adsorbent, reducing the efficiency of adsorbent use

Method used

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  • Macroporous zeolite absorbent and preparation method thereof
  • Macroporous zeolite absorbent and preparation method thereof
  • Macroporous zeolite absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0020] Embodiments 1-4: Preparation of sodium zeolite powder crystals

[0021] Water glass is weighed respectively by the reactant molar proportion of table 1 (its mass chemical composition (%): SiO 2 = 25.33; Na 2 O=7.28), solid aluminum sulfate Al 2 SO 4 18H 2 O, sulfuric acid and water, after mixing, vigorously stir for 1 to 2 hours until uniform Na 2 O-SiO 2 -Al 2 o 3 -H 2 O reactant colloid. The colloid is placed in a stainless steel high-pressure reaction kettle, sealed, heated to a set temperature in a constant temperature oven, left to stand at constant temperature for a predetermined time, and taken out of the reaction kettle from the oven and cooled to room temperature. The reaction product was washed with deionized water, filtered and dried. The crystal phase of the synthesized product zeolite was identified by XRD diffractometer. Except containing a small amount of miscellaneous crystals in the product of example 2, other synthetic products are all sodiu...

Embodiment 5～7

[0023] Examples 5-7: Sodium-type zeolite cation-exchange hydrogen-producing zeolite

[0024] Weigh 500 grams of the sodium-type zeolite synthesized in Example 3, and carry out ion exchange with the acid (or ammonium salt) solutions listed in Table 2 in a stainless steel container to obtain the hydrogen-type zeolite. The exchange product was washed with deionized water until pH = 6, filtered and dried. Analyzing the Na of the obtained hydrogen-type zeolite 2 O content, the data are listed in Table 2 to prove that the exchange effect is good.

[0025] Example

Embodiment 8

[0027] Use the preparation conditions of Example 6 to scale up and prepare 10 kg of hydrogen-type zeolite powder crystals. In the rolling ball forming machine, powder crystal and silica sol binder (containing 30% SiO 2 ) to make adsorbent pellets with a diameter of 1.5-2.2 mm. Calculated according to the amount of the binder, in the prepared adsorbent pellets, on a dry weight basis, the amorphous silica binder / hydrogen zeolite=0.2. After drying in an oven, the content of silica and alumina was measured, and the molar ratio of silica to alumina was calculated to be 15.5. After the adsorbent was activated at 550°C, its low-temperature nitrogen adsorption isotherm and pore size distribution diagram were measured with an automatic adsorption instrument, and its surface area, pore volume and average pore size were calculated.

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Abstract

The invention provides the large aperture zeolitic adsorbent and preparing method. The method comprises the following steps: hydrothermal synthesizing the zeolitic in Na2O-SiO2-Al2O3-H2O colloidal system, possessing the X-ray spectrum, removing the sodium with positive ion exchange, forming with binding agent and modifying with aqueous vapor. The average pore size of adsorbent is 11 nanometers, and the adsorbent is used to remove micro inorganic or organic iodide and iodine from acid medium.

Description

technical field [0001] The invention relates to a large-pore zeolite adsorbent and a preparation method thereof technical background [0002] Higher cation exchange capacity and stable large pore size adsorbents in acidic media are required in chemical industry production. For example, residual traces of iodide (derivatives) and molecular iodine in acetic acid and acetic anhydride products produced by methanol low-pressure oxo synthesis need to be removed. [0003] US Patent No. 5,692,735 was the first to report the silver-type zeolite molecular sieve made of mordenite through exchange, which can be used to remove iodide in acetic acid. US Pat. No. 6,380,428 proposes to use LZ-210 zeolite (a dealuminated Y zeolite) to prepare a silver-type zeolite adsorbent by exchange for removing iodide from acidic media. The openings of the above two zeolite structure channels are all 12-membered oxygen rings (0.65-0.70nm), and the removal efficiency of iodides and derivatives with larg...

Claims

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Application Information

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IPC IPC(8): B01J20/18
Inventor 龙英才周皓岚王群周亚明陈墨庆崔伟汪靖
Owner FUDAN UNIV
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