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Acid resistant zeolite adsorbent and preparation thereof

A technology of adsorbent and zeolite, which is applied in the field of acid-resistant zeolite adsorbent and its preparation, can solve the problems of uneven pore size distribution of coarse pores, reduce the use efficiency of adsorbent, and affect the strength of adsorbent, so as to achieve good acid resistance, high strength, Favorable Diffusion Effect

Inactive Publication Date: 2005-07-27
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of the amorphous binder among the zeolite powder crystal grains in the adsorbent particles, the coarse pore size distribution between the zeolite crystal grains is uneven. Diffusion to the zeolite crystal grains also reduces the use efficiency of the adsorbent and affects the strength of the adsorbent

Method used

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  • Acid resistant zeolite adsorbent and preparation thereof
  • Acid resistant zeolite adsorbent and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0018] Examples 1 to 4: Preparation of sodium zeolite powder crystals

[0019] Weigh the water glass (its mass chemical composition (%)) according to the molar ratio of the reactants in Table 1 2 =25.33; Na 2 O=7.28), solid aluminum sulfate Al 2 SO 4 ·18H 2 O, sulfuric acid and water, after mixing, stir for 1-2 hours until uniform Na is formed 2 O-SiO 2 -Al 2 O 3 -H 2 O reactant colloid. The colloid is placed in a stainless steel autoclave, sealed, heated to a set temperature in a constant temperature oven, allowed to stand for a constant constant temperature reaction to a predetermined time, and the reaction kettle is taken out of the oven and cooled to room temperature. The reaction product is washed with deionized water, filtered, and dried. The crystal phase of the synthesized product zeolite was identified by XRD diffractometer. Except for the product of Example 4 which contains a small amount of quartz heterocrystalline phase, the other synthesized products are all pure phas...

Embodiment 5～7

[0021] Examples 5-7: Exchange of sodium ion zeolite for hydrogen production zeolite

[0022] Weigh 500 grams of the sodium-type zeolite synthesized in Example 2, and perform ion exchange with the acid (or ammonium salt) solutions listed in Table 2 in a stainless steel container to prepare a hydrogen-type zeolite. The exchange product is washed with deionized water to PH=6, filtered and dried. Analyze the Na of the obtained hydrogen zeolite 2 O content, the data are listed in Table 2, to prove that the exchange effect is good.

[0023] Example

Embodiment 8

[0025] The preparation conditions of Example 5 were used to scale up and prepare 10 kilograms of hydrogen-type zeolite powder crystals. In the rolling ball forming machine, gradually add powder crystal and silica sol binder (containing 30% SiO 2 ) To make adsorbent pellets with a diameter of 1.5 to 2.2 mm. Calculated according to the amount of binder, in the prepared adsorbent pellets, on a dry 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 22.8. The crushing strength of 50 pellets with a diameter of 2.0 mm was measured, and the average value obtained was 40 Newtons / particle.

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Abstract

An acid-resistant zeolite adsorbent with characteristic X-ray diffraction spectrum is prepared through hydrothermal synthesizing of zeolite in Na2O-SiO2-Al2O3-H2O colloidal reactant system, cationic exchanging for removing Na, adding adhesive, shaping and steam ageing. Its advantages are high resistance to acid, high strength and uniform pore structure.

Description

Technical field [0001] The invention relates to an acid-resistant zeolite adsorbent and a preparation method thereof. technical background [0002] In the chemical industry, adsorbents that are stable in acidic media and have high ion exchange capacity are needed. For example, residual trace amounts of iodide (derivatives) and molecular iodine in the acetic acid and acetic anhydride products produced by the methanol low-pressure carbonyl synthesis method need to be removed. [0003] U.S. Patent No. 5,692,735 first reported that a silver zeolite molecular sieve made of mordenite by exchange can be used to remove iodide in acetic acid. US Patent 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 pores of the above two zeolite structures are all 12-membered rings (0.65~0.70nm), which have higher removal efficiency for iodides and derivatives with lar...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30
Inventor 龙英才周皓岚陈墨庆崔伟
Owner FUDAN UNIV
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