Phosgenation method

Details Phosgenation method Phosgenation method

1995-11-14

1997-12-02

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C26300

Patent

active

056938535

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.

REFERENCES:
patent: 3912600 (1975-10-01), Hatfield, Jr. et al.
patent: 4014914 (1977-03-01), Pistor et al.
patent: 4251457 (1981-02-01), Kondratenko et al.

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