Removal of impurities
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United States of America Patent
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Apr 17, 1984
Grant Date -
N/A
app pub date -
Mar 29, 1983
filing date -
Mar 29, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This purification process has been developed for liquid polymer feed streams having one or more impurities present at levels of 2% or less by weight of the stream. This purification process comprises: (a) forcing the liquid polymer feed stream through a spray nozzle into an inert atmosphere at a temperature of from about 68.degree. F. to about 392.degree. F. where the pressure is at or below 1 atmosphere in such a manner to atomize the feed stream into particulate drops having a size in the range of from about 1,000 microns to about 50 microns in diameter, (b) retaining particulate drops under the conditions of (a) and at a temperature in the range of from about 68.degree. F. to about 392.degree. F. for at least 0.10 seconds to form impurity vapors, (c) removing the vaporous impurities that form during step (b), and (d) collecting the purified atomized feed stream liquid wherein the purified feed stream has a vapor pressure no higher than 1.times.10.sup.-3 (mm) of mercury (Hg) at 68.degree. F. and no higher than 50 mm of Hg at 392.degree. F., and the impurities removed in step (c) have vapor pressures no lower than 10 mm Hg at 68.degree. F., and no lower than 5,000 mm of Hg at 392.degree. F.
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