Continuous process for converting polytetramethylene ether...

Details Continuous process for converting polytetramethylene ether... Continuous process for converting polytetramethylene ether...

2005-12-27

2005-12-27

Acquah, Samuel A. (Department: 1711)

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

Organic compounds

Oxygen containing

C526S065000, C526S066000, C526S067000, C526S068000, C526S069000, C526S071000, C524S706000, C524S710000, C524S711000, C524S779000

Reexamination Certificate

active

06979752

ABSTRACT:
A continuous process for converting by transesterification the diester of polytetramethylene ether (PTMEA) to the corresponding polytetramethylene ether glycol (PTMEG). The process is characterized by the fact that the feed, consisting of PTMEA along with an alkanol (preferably methanol) and with an alkali metal oxide, hydroxide or alkoxide catalyst (preferably sodium methaoxide) is made to react in two multistaged reactions in series. In the first reactant, including stages of retention in association with distillation trays of high efficiency, the bulk of conversion is achieved by stripping the alkanol ester formed in the transesterification with vapors of hot alkanol having a reduced content of alkanol ester. The transesterification is completed in the second reaction by stripping the effluent from the first reactor with vapors of hot alkanol almost free of alkanol ester. The PTMEG product is finally purified by neutralizing the alkaline catalyst with a mixture of phosphoric acid and sodium phosphate monobasic.

REFERENCES:
patent: 4230892 (1980-10-01), Pruckmayr
patent: 4460796 (1984-07-01), Mueller
patent: 5981688 (1999-11-01), Auer
patent: 198 17113 (1999-10-01), None
patent: 97/23559 (1997-07-01), None
Data base XP-002162053.

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