Method for purifying (meth)acrylic monomers by distillation
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United States of America Patent
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Apr 18, 2006
Grant Date -
N/A
app pub date -
Nov 15, 2000
filing date -
Nov 24, 1999
priority date (Note) -
Expired
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Abstract
The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor requiring input of oxygen and/or an inhibitor having better efficacy in the presence of oxygen for stabilizing the liquid phase. The invention is characterized in that the distillation is performed in the presence of a NO2 gas, with an oxygen/organic vapor (p/p) ratio ranging between 0.02 and 3%, and with a NO2 condensed organic vapor (p/p) ratio ranging between 0.01 and 50 ppm.
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