Patent ID: 6201137
Filing Date: 2001-03-13
Classification: C07D

Abstract:
A method for purifying a crude tetrahydrofuran which is then suitable for the preparation of a polyether polyol comprising:contacting said crude tetrahydrofuran represented by the general formula (1) with mineral acid selected from the group consisting of nitric acid, sulfuric acid and phosphoric acid, said contacting being conducted at a temperature from the room temperature up to the boiling point of said tetrahydrofuran, andthen instantly distillating by at least one of a simple distillation or a rectification, wherein said general formula (1) is: ##STR3##wherein R.sub.1 and R.sub.2 represent a hydrogen atom or an alkyl group of normal chain or graft whose carbon number is 1 to 5 and can be same or not be same.