4a molecular sieve activation

4a molecular sieve, can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene and other low-molecular compounds pore molecular sieve 4A, does not adsorb any molecular diameter greater than 4A (including propane), high selective adsorption for water any other molecules, is one of the largest industrial use of molecular sieve varieties of. 110 ° C for moisture evaporation large space is possible, but it is impossible to sieve pore water rush out. Thus, in general laboratory muffle furnace drying can be activated by dehydration at a temperature of 350 ° C, dried 8 hours at atmospheric pressure (vacuum pump, if there is, can be dried for 5 hours at 150 ° C exhaust case). Activated molecular sieve in air cooled to 200 ° C (about 2 minutes), and immediately stored in a desiccator. If the conditions applied during cooling and preservation of dry nitrogen to prevent moisture in the air is absorbed again. Old sieve contaminants after use, when activated not only up to a temperature of 450 ° C, but also to pass into the steam or inert gas (nitrogen) to substitute other substances out of zeolite adsorbent