WE ANALYZE RECOVERED REFRIGERANTS AT OUR LAB IN N.J. OUR PROBLEM IS THE RESIDUAL COMPRESSOR OILS IN LIQUID REFRIGERANTS. (i.e. R11,R123,R113). WE NEED A PROCEDURE TO REMOVE THESE OILS BEFORE INJECTING INTO OUR GC'S. OF COURSE WE DON'T WANT TO CHANGE THE COMPOSITION OF THE REFRIGERANT BECAUSE WE PAY FOR THESE RECOVERED REFRIGERANTS ACCORDING TO PURITY. ALSO, BECAUSE OF THE VOLUME OF SAMPLES WE RUN, ANY PROCEDURE WOULD NECCESSARILY HAVE TO BE LESS THAN SAY 30 MIN. ANY SUGGESTIONS WOULD BE GREATLY APPRECIATED. WE'VE TRIED KITTY LITTER, VERMICULITE, & CARBOBLACK.
By Bruce Freeman on Monday, September 25, 2000 - 07:17 am:
How about room-temperature distillation? Use dry ice - propanol to condense the vapor. You might want to devise some sort of micro-scale apparatus based upon a piece of tubing (evaporates from one end, condenses at the other).
By Bill Jenko on Wednesday, September 27, 2000 - 05:39 pm:
How about adding a short pre-column to hold the lube oils, which should be much heavier than the refrigerants, then backflush this column using a 4-port valve.
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