Method for removing transesterification catalyst from polyether

Details Method for removing transesterification catalyst from polyether Method for removing transesterification catalyst from polyether

1994-02-17

1995-04-25

Mars, Howard T.

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

Organic compounds

Oxygen containing

568617, C07C 4104

Patent

active

054100933

ABSTRACT:
An improved method for recovering purified poly(tetramethylene ether) glycol or similar polyether polyol from an aqueous solution of polymer containing an alkaline metal catalyst residue involving the addition of a stoichiometric excess of magnesium sulfate or sulfite followed by evaporation of water and separation of molten polymer from precipitated solid phase (i.e., from magnesium hydroxide, alkaline metal sulfate/sulfite, and excess magnesium sulfate/sulfite). Such a process results in essentially complete removal of any basic transesterification catalyst and water without significant lost of poly(tetramethylene ether) glycol or the like.

REFERENCES:
patent: 3833669 (1974-09-01), Gehm et al.
patent: 4137396 (1979-01-01), Louvar et al.
patent: 4306943 (1981-12-01), Mori et al.
patent: 4371713 (1983-02-01), Matsumoto et al.
patent: 4460796 (1984-07-01), Mueller
patent: 4985551 (1991-01-01), Perry et al.

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