PURIFICATION METHOD FOR OBTAINING HIGH-PURITY PMDA
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United States of America Patent
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Nov 5, 2002
Grant Date -
Dec 12, 2002
app pub date -
May 16, 2001
filing date -
May 16, 2001
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Abstract
A purification method for obtaining high-purity PMDA. The method controls temperatures of cyclone separators in a series to separate PMDA and other by-products of different sublimation temperatures. High-purity PMDA is collected in the first cyclone separator, and no other purification steps are needed.
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