Adsorption separation application of calcium-containing molecular sieve Ca-CHA

• Main Authors: LI LANDONG, LIU SHANSHAN, WU GUANGJUN, BAI PU, JIA JIZHEN
• Format: Patent
• Language: Chinese; English
• Published: 14.03.2023
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a calcium-containing chabazite molecular sieve adsorbent Ca-CHA capable of efficiently separating a krypton-xenon mixture and a nitrogen-oxygen mixture, which is synthesized by taking a commercial Na-Y molecular sieve as a raw material through the steps of ion exchange, crystal transformation and the like. The prepared Ca-CHA molecular sieve has a strong local electric field, and has an extremely strong adsorption effect on xenon and nitrogen. Ca-CHA can selectively adsorb xenon from a krypton and xenon mixture so as to realize krypton and xenon separation; and nitrogen can be selectively adsorbed from a nitrogen-oxygen mixture, and the adsorbent can be used as a nitrogen selective adsorbent in an adsorption oxygen production process. The method for separating the krypton-xenon mixture from the nitrogen-oxygen mixture by using the calcium-containing chabazite Ca-CHA is simple and convenient, the adsorbent is low in cost, and the method has a relatively strong industrial popularization