How to regenerate the molecular sieve of chromatographic gas purifier if it fails?
Thread Content
Hello everyone! Let me ask you a question: How to regenerate the molecular sieve of gas purifier for chromatography after it fails? There is a 105 catalyst in the molecular sieve that removes oxygen. Thanks! This post was last edited by Cang Hai Yisha on 2009-2-10 16:56 ]
Molecular sieves that can be used in series and processed separately. It is best not to mix them together. When processing molecular sieves, try not to exceed 500 degrees Celsius.
I only know that the silica gel used for drying can be regenerated through drying. I don’t know how to regenerate the oxygen scavenger.
Usually it's replacement, but regeneration is also possible. The temperature is controlled at 350 degrees, and the regeneration time is 2 to 4 hours under ventilation conditions. Of course, a longer time is also acceptable. It is best to use purge regeneration, otherwise the filler will be broken more severely. I don’t know if 105 can be reduced. If it can be reduced, it should be blown with hydrogen. Control the outlet flow to 30ML/MIN. The tail outlet should be connected to the outdoors. This post was last edited by chengjingbao on 2009-2-10 20:20 ]
The first step is to raise the temperature to 90 degrees under aging conditions and keep it stable for 20 minutes. Observe the column pressure. If there is no sharp rise, you can go to the second step and raise it to the 150 platform. If it rises too much and then drops sharply, it means that there is too much dirt in the column and there is column blockage. You should lower the temperature by 10 degrees and continue to observe.； After the second step and time are almost stable with the first step, go to the third step, 230 degrees, and the fourth step, 270. If you want to continue, go to 320. After the baseline is flat or other parameters are stable, calculate the stable aging time. The length of time should be judged according to the substances you separate and the efficiency of the column. Generally, 2 to 8 hours is good.