Phosgenation method
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United States of America Patent
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Dec 2, 1997
Grant Date -
N/A
app pub date -
Nov 14, 1995
filing date -
Nov 15, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of phosgenation while using carbonyl chloride produced from chlorine and contaminated carbon monoxide. The obtained contaminated carbonyl chloride is purified prior to being delivered to the phosgenation process. The carbonyl chloride is purified by absorption in a solvent and the obtained carbonyl chloride solution is used for the phosgenation reaction. The carbonyl chloride is conveniently purified in an absorption column which is also used to recover carbonyl chloride from waste gases deriving from the phosgenation process, wherein the solution of fresh and recovered carbonyl chloride is delivered commonly to the phosgenation process.
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