High-performance variable-pressure adsorption 5A molecular sieve and preparing method thereof

A pressure swing adsorption and molecular sieve technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of low adsorption capacity and diffusion rate, and achieve the effects of increasing adsorption capacity, increasing diffusion rate, and improving mechanical strength

Inactive Publication Date: 2004-09-22
江苏洁欧康科技有限公司
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AI Technical Summary

Problems solved by technology

Due to the large amount of clay added, its adsorption capacity and diffusion rate are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 94 parts (weight) of 4A molecular sieve former powder are mixed with 6 parts (weight) of kaolin, add 1.5 parts (weight) of plant fiber powder (plant shell system, cross 320 mesh) and granulate at high speed in a high-speed granulator for 10 minutes. Sieve to obtain the intermediate product of Φ1.6-2.5mm, roast at 800°C after drying, and immerse the intermediate product after roasting in 5% (weight) sodium hydroxide solution for alkali treatment, wash it with 4% (weight) CaCl 2 solution for Ca 2+ Exchange, wash and dry, then bake at 500°C. The obtained product has a strength of 33 Newtons; its H is determined by the BET method 2 The amount of O adsorption is 26.02% when the relative humidity is 50%; the diffusion rate O is measured by chromatography 2 1.04×10 -2 cm 2 / sec, N 2 1.03×10 -3 cm 2 / second; use a dynamic evaluation device to measure its oxygen enrichment capacity O 2 is 92.6% when pure O 2 The production rate was 20.05 Nl / h kg.

Embodiment 2

[0021] 92 parts (weight) of 4A molecular sieve former powder are mixed with 8 parts (weight) of kaolin, add 1.5 parts (weight) of plant fiber powder (plant shell system, cross 320 mesh), stir at a high speed in a high-speed granulator for 10 minutes to granulate, After sieving, the intermediate product of Φ1.6-2.5mm is obtained. After drying, it is roasted at 800 ° C. The intermediate product after melting is immersed in 10% (weight) sodium hydroxide solution for alkali treatment, and washed with 6% (weight) ) CaCl 2 solution for Ca 2+ exchanged, washed and dried, then roasted at 500°C, the strength of the obtained product was 33 Newton; its H was determined by BET method 2 The amount of O adsorption is 26.07% when the relative humidity is 50%; the diffusion rate O is measured by chromatography 2 1.05×10 -2 m 2 / sec, N 2 1.04×10 -3 cm 2 / second, use a dynamic parity device to measure its oxygen enrichment capacity O 2 is 92.7% when pure O 2 The production rate was 2...

Embodiment 3

[0023] Mix 90 parts (weight) of 4A molecular sieve raw powder with 10 parts (weight) of kaolin, add 5 parts (weight) of plant fiber powder (made from plant stems, over 400 mesh), stir at high speed in a high-speed granulator for 10 minutes, and sieve The intermediate product of Φ0.4-0.85mm is separated, and after drying, it is roasted at 700 ° C. The intermediate product after roasting is immersed in 15% (weight) of sodium hydroxide solution for alkali treatment, and after washing, it is washed with 10% (weight) of CaCl 2 solution for Ca 2+ After exchange, washing and drying, roasting at 400°C, the strength of the obtained product is 35 Newton, and its H is measured by BET method. 2 The amount of O adsorption is 27.16% when the relative humidity is 50%; the diffusion rate O is measured by chromatography 2 1.14×10 -2 cm 2 / sec, N 2 3.20×10 -3 cm 2 / second, use a dynamic parity device to measure its oxygen enrichment capacity O 2 92.5% pure O 2 The production rate was ...

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Abstract

A high-performance 5A molecular sieve with pressure-variable adsorption function is prepared through proportionally mixing the raw powder of 4A molecular sieve with kaolinite-type clay, adding plant fibres, granulating, sieving, baking, calcining at 200-1000 deg.C, immersing in the solution of sodium hydroxide, washing, Ca ion exchanging in CaCl2 solution, washing, baking, and calcining at 100-800 deg.C. Its advantages are high adsorption capacity, diffusing speed, and mechanical strength.

Description

technical field [0001] The invention relates to a high-performance pressure swing adsorption 5A molecular sieve for pressure swing adsorption (abbreviated as PSA) oxygen production, hydrogen production and petroleum dewaxing and a preparation method thereof. Background technique [0002] The pressure swing adsorption (PSA) process is characterized by the adsorption and desorption of molecular sieves by changing the pressure and temperature. The adsorption cycle is short, the switching is frequent, and the pressure changes greatly. Therefore, the requirements for the diffusion rate of the molecular sieve are high, and the requirements for the mechanical strength of the molecular sieve are also high. [0003] The traditional preparation method of PSA molecular sieve products is to use 4A molecular sieve powder through Ca 2+ After the exchange, it is made by adding a binder to roll the ball, and then roasting. After the molecular sieve is formed, it is roasted to make the bin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30
Inventor 张永全顾晓明章少俊
Owner 江苏洁欧康科技有限公司
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