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Process for preparing adsorbent of molecular sieve with high adsorption value fluorite

A technology of zeolite molecular sieve and molecular sieve, which is applied in the preparation of modified 5A molecular sieve adsorbent and the preparation of high-adsorption zeolite molecular sieve adsorbent, which can solve the problems of low carbon monoxide yield, difficult desorption, inconvenient operation, etc., and the method is simple Easy to operate, low cost, and the effect of improving adsorption performance

Inactive Publication Date: 2006-01-25
TAIYUAN UNIV OF TECH
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  • Summary
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  • Description
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Problems solved by technology

However, the desorption of carbon monoxide is more difficult. The desorption temperature of Cu(I)-zeolite molecular sieve adsorbent is above 200°C, and the desorption temperature of Cu(I)-activated carbon adsorbent is also above 120°C. The desorption method is difficult to regenerate the adsorbent, and heating or high vacuum desorption and regeneration must be used, which not only consumes a lot of energy, is inconvenient to operate, but also has a low carbon monoxide yield

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0012] Binder-free 4A molecular sieve is mixed with calcium chloride solution with a pH=5.86 and a concentration of 0.60 mol / L at a solid-to-liquid ratio of 1:3, and exchanged at 90°C to achieve equilibrium to obtain 5A molecular sieve. After washing and drying, Divide it into two parts, take one part after activation at 550°C, and use gravimetric adsorption method at 25°C, 101.325×10 3 The carbon monoxide adsorption capacity measured under Pa is 22.6ml / g. The other part was soaked in 0.02mol / L sodium hydroxide solution at a solid-to-liquid ratio of 1:2 at 35°C for 1 hour, dried, and activated under the same conditions, and the carbon monoxide adsorption was measured to be 23.1ml / g. After desorption, it is adsorbed again, and the carbon monoxide adsorption capacity is 23.0ml / g.

Embodiment approach 2

[0014] In Embodiment 1, the concentration of the impregnation solution is changed to 0.05mol / L, the impregnation temperature is changed to 60°C, the impregnation time is changed to 2h, the solid-liquid ratio of impregnation is changed to 1:3, and other conditions remain unchanged, the carbon monoxide adsorption capacity is 24.6ml / g.

Embodiment approach 3

[0016] Change the concentration of the impregnation solution in Embodiment 1 to 0.10 mol / L, the impregnation temperature to 90°C, the impregnation time to 3 hours, the impregnation solid-to-liquid ratio to 1:4, and other conditions unchanged, the carbon monoxide adsorption capacity is 25.3ml / g.

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Abstract

An adsorbent of zeolite molecular sieve with high adsorbent to CO is prepared through ion exchange between non-adhesive 4A molecular sieve and calcium chloride solution, water washing, baking to obtain 5A molecular sieve, immersing it in the diluted solution of sodium hydroxide or water glass, baking and activating.

Description

1. Technical field [0001] The preparation method of the high adsorption capacity zeolite molecular sieve adsorbent of the invention belongs to the technical field of preparation and modification of zeolite molecular sieves. Specifically, it relates to a preparation method of a modified 5A molecular sieve adsorbent with high carbon monoxide adsorption capacity. 2. Technical Background [0002] With C 1 With the rapid development of chemistry, the application of carbon monoxide in the development of chemical industry is becoming more and more extensive. The synthesis of many chemical products such as formic acid, acetic acid, oxalic acid, dimethylamide, phosgene, polycarbonate, polyurethane and other compounds requires pure carbon monoxide; At the same time, in the synthesis of ammonia, toluene diisocyanate (TDI) and other industries, the existence of trace carbon monoxide in the gas will cause catalyst poisoning of some reactions, which must be removed; in addition, there ar...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30
Inventor 马静红赵忠林程文萍李瑞丰崔杏雨
Owner TAIYUAN UNIV OF TECH
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