Process for separating off poisonous volatile chemical compounds from a mixture of solid particles having a particle size of up to 200 microns
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United States of America Patent
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Mar 3, 1992
Grant Date -
N/A
app pub date -
Oct 28, 1988
filing date -
Oct 30, 1987
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Expired
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Abstract
A process for separating off poisonous volatile chemical compounds from a mixture (7) of solid particles having a particle size of up to 200 .mu.m, the mixture being brought continuously or intermittently at an average rate of 5.degree. to 200.degree. C./min in zones of progressively increasing temperature up to 1350.degree. C. and the poisonous chemical compounds being evaporated and forced to leave the reaction space (6). The poisonous compounds are subsequently condensed and discharged. The non-evaporated residue is gradually melted, and the melt (8) is continuously or intermittently discharged from the reaction space (6) and solidified. The particles carried over into the gas phase are preferably retained by a hot gas filter, liquefied and passed into the melt.
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