| 摘要 |
<p>PURPOSE:To obtain such a zeolite from which separated gas such as high concn. nitrogen and oxygen can be obtained as much as possible in a unit time and unit weight, by specifying the calcium substitution rate and specific surface area of zeolite. CONSTITUTION:This zeolite granulare body is obtained by substituting Ca ions for >=95% of Na ions in sodium-A zeolite, and has >=8m<2>/g specific surface area. The zeolite granules thus obtd. have good selectivity for gas and a large gas adsorption/ desorption rate. If the Ca substitution rate in this granular body is <95%, adsorption amt. of nitrogen decreases. Though the larger specific surface area gives the larger adsorption amt. of nitrogen, strength of the granular body may decrease when the specific surface area exceeds 15m<2>/g.</p> |
