Gary,
	I believe that I missed your original posting mentioning molecular
sieve for "recycling" xylene.  I am willing to admit my ignorance and would
like to hear more about this process.  We have been using a spinning band
still to recycle xylene and alcohol for the past 10 years.  At the moment we
are considering up grading our aging still.  We would consider alternative
technology--keeping in mind the usual things laboratories consider:  quality
results, safety, environmental/disposal issues, use of tech time,
initial/capital and consumable supply expenses. Your posting is the first
time I have heard of this technique.  Please tell all of us more!

Jeannie Fisher