Acetic anhydride, method of purifying crude acetic...

Details Acetic anhydride, method of purifying crude acetic... Acetic anhydride, method of purifying crude acetic...

2006-01-17

2006-01-17

Sergent, Rabon (Department: 1711)

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

Organic compounds

Carboxylic acid anhydrides

C203S031000, C528S405000, C528S408000, C528S417000, C528S501000, C562S887000, C568S617000, C568S621000

Reexamination Certificate

active

06987201

ABSTRACT:
The present invention provides acetic anhydride, a method of purifying crude acetic anhydride, and a method of producing polyoxytetramethylene glycol using acetic anhydride.A method of producing polyoxytetramethylene glycol by ring-opening-polymerizing tetrahydrofuran in the presence of acetic anhydride and an acid catalyst, wherein said ring-opening polymerization is conducted using acetic anhydride having a diketene concentration of 10 ppm or less to produce polyoxytetramethylene glycol.

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