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Preparation method of zeolite adsorbent for generating oxygen by mean of air separation

A technology of zeolite and adsorbent for air separation oxygen production, applied in the direction of oxygen preparation, chemical instruments and methods, silicates, etc., can solve the problems affecting the effective utilization of attapulgite, and achieve cheap, easy-to-obtain and easy-to-control raw materials , High nitrogen adsorption capacity and the effect of nitrogen-oxygen separation ratio

Inactive Publication Date: 2012-07-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the natural attapulgite is mostly of medium and low grade, which contains impurities such as quartz, and the attapulgite components in it mostly exist in the form of rod crystal bundles or aggregates formed by the aggregation and stacking of rod crystal bundles, which affects the attapulgite. Effective Utilization of Stick Clay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] (1) Dissolve 0.4g of sodium pyrophosphate in 400ml of water and stir until completely dissolved; then add 40g of attapulgite clay into the above aqueous solution under mechanical stirring and stir for 1 hour, then ultrasonically shake for 2 hours; After standing still for 4 hours, the upper and lower parts of the suspension were separated, and the upper layer of the suspension was taken, filtered and then dried in an oven at 90° C. to obtain an attapulgite binder.

[0018] (2) Mix 12g of the above-mentioned attapulgite binder with 48g of zeolite 13X powder evenly, add water and knead into a dough, extrude into a strip-shaped sample, dry the sample in an oven at 120°C and in a muffle furnace at 500°C Calcined for 4 hours to obtain the bulk zeolite 13X adsorbent (2).

[0019] According to the same ingredient ratio and adsorbent preparation method, the binder was replaced by untreated original attapulgite clay, and the type zeolite 13X adsorbent (1) was prepared.

[0020]...

Embodiment approach 2

[0022] The amount of sodium pyrophosphate in step (1) of embodiment 1 is changed to 0.8g, and other conditions are unchanged, the attapulgite clay is processed; then take 12g of the attapulgite binder processed, and then according to step (2), obtain Bulk Zeolite 13X Adsorbent (3). At 25° C. and a pressure of 760 mmHg, the nitrogen adsorption capacity of the adsorbent (3) is 6.92 ml / g, and the adsorption-separation ratio of nitrogen and oxygen is 3.02.

Embodiment approach 3

[0024] 0.4g sodium pyrophosphate is changed to 1.2g sodium hexametaphosphate in the embodiment 1 step (1), and other conditions are constant, and the attapulgite clay is processed; then get the attapulgite binding agent 12g of processing, then press step ( 2) to prepare bulk zeolite 13X adsorbent (4). At 25°C and a pressure of 760mmHg, the nitrogen adsorption capacity of the adsorbent (4) is 7.23ml / g, and the adsorption-separation ratio of nitrogen and oxygen is 2.78.

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Abstract

The invention provides a zeolite adsorbent for generating oxygen by mean of air separation and a preparation method of the zeolite adsorbent for generating oxygen by mean of air separation, belonging to the field of the preparation of inorganic material and adsorbent. The method is characterized in that the method is a preparation method of 13X zeolite adsorbent, which takes purified, dispersed and surfacely modified attapulgite clay as binder. The preparation method comprises the following steps of: firstly, purifying, dispersing and surfacely modifying the natural attapulgite clay by sodium pyrophosphate, sodium hexametaphosphate or sodium polyacrylate dispersing agent-containing water solution under the effects of mechanical stirring and ultrasonic oscillating, and preparing the 13X zeolite adsorbent by using the purified, dispersed and surfacely modified attapulgite clay as binder, wherein the adsorbent is high in nitrogen adsorption capacity and nitrogen-oxygen adsorption separation ratio, thereby being capable of being taken as the adsorbent for generating oxygen by mean of air separation. The natural attapulgite clay ore can be treated by the combined action mechanism of the ultrasonic oscillation and the dispersing agent, and the purifying, dispersing and surface modifying of the natural attapulgite clay ore can be completed for once, so that the preparation process is simple and easy to control.

Description

technical field [0001] The invention relates to a preparation method of a zeolite adsorbent for air separation oxygen production, which belongs to the field of preparation of inorganic materials and adsorbents. Specifically, it relates to a 13X zeolite adsorbent with high nitrogen adsorption capacity and nitrogen-oxygen adsorption separation ratio. The preparation of the adsorbent uses attapulgite clay that has been purified, dispersed and surface-modified as a binder. Background technique [0002] At present, the pressure swing adsorption air separation technology is the main method for the separation of nitrogen and oxygen. However, whether the adsorption separation can achieve high efficiency and low consumption and be applied in industry depends on the adsorption and separation performance of the adsorbent. The performance of the adsorbent determines the effect of adsorption separation, and thus determines the investment and economy of adsorption separation equipment. I...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C01B13/02
Inventor 马静红任晶李瑞丰刘英
Owner TAIYUAN UNIV OF TECH
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