I beelieve it was LUGH? that had a post about this around a year ago. Maybe WizardX! Since the UTFSE® is tempoRAREily disabled, I'll try an alternate but painstaking way of searching for it!
Maybee he'll chime in before I dig it UP or someone else has the answer.
While I'm searching...the thread, according to my best recollection detailed the advantages of using NON-VOLATILEanti-foaming agents during distillation processes.
It may have been dealing with essential oil extraction but don't quote me. I just remember seeing it here ;)
It was over my head so I don't recall much more than that...
One such non-volatile AFA is Anti-foam B:
•Hydrogenated tallow glycerides
•Synonyms/Common Names: Silicon Emulsion
Section X - Stability and Reactivity
•Stability: Stable Hazardous Polymerization: Will not occur
•Conditions to Avoid: N/A Materials to Avoid: Oxidizing material can cause a reaction.
•Hazardous Decomposition Products: Silicon dioxide, carbon dioxide, and Traces of incompletely burned carbon products, and formaldehyde.
Antifoam B Emulsion (http://hillbrothers.com/msds/abe.htm)
(http://hillbrothers.com/msds/abe.htm)