Process for producing polyether, and process for recycling and r

Details Process for producing polyether, and process for recycling and r Process for producing polyether, and process for recycling and r

1996-08-28

1998-05-26

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing and recycling removed material from an ongoing...

528410, C08G 206

Patent

active

057566046

ABSTRACT:
An industrially advantageous process described below has been established wherein tetrahydrofuran and a cyclic ether copolymerizable therewith are copolymerized by the use of a very small amount of a commercially available heteropolyacid as it is untreated, the heteropolyacid of the catalyst is recovered, recycled and reused in a simple way, and a high quality polyether substantially free from catalyst contaminants is obtained. A process for producing a polyether, comprising the steps of copolymerizing tetrahydrofuran and at least one cyclic ether copolymerizable therewith by the use of an untreated heteropolyacid as a catalyst in the presence of a hydroxy compound to form a reaction liquid, contacting the resulting reaction liquid with an anion exchange resin so that the heteropolyacid contained in the reaction liquid adsorb to the anion exchange resin to remove the heteropolyacid, desorbing the removed heteropolyacid from the anion exchange resin to reuse it as the catalyst, and reusing the anion exchange resin after the desorption as it is, thus to recycle and reuse both the catalyst and the anion exchange resin.

REFERENCES:
patent: 4677231 (1987-06-01), Aoshima et al.
patent: 5395959 (1995-03-01), Weyer et al.
patent: 5414143 (1995-05-01), Weyer et al.
Brotas de Carvalho et al., Rev. Port. Quim (1976), 18, pp. 108-112.

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