| 摘要 |
A process for purifying a crude polyether, comprising contacting a crude polyether obtained by addition polymerizing an active hydrogen-containing compound with an alkylene oxide compound in the presence of an alkali metal-containing basic catalyst to an adsorbent comprising a synthesized hydrous magnesium silicate compound which satisfies the following requirements (1) to (5) in order to reduce the alkali metal content of the crude polyether: (1) it is represented by the following formula I: <?in-line-formulae description="In-line Formulae" end="lead"?>(CaO)<SUB>x</SUB>.(MgO)<SUB>y</SUB>.(Al<SUB>2</SUB>O<SUB>3</SUB>)<SUB>z</SUB>.SiO<SUB>2</SUB>.mH<SUB>2</SUB>OI<?in-line-formulae description="In-line Formulae" end="tail"?> wherein x, y, z and m satisfy the following ranges: x<y, z<y, 0<=x<=0.1, 0.6<=y<=0.6, 0<=z<=0.1 and 0.1<=m<=1.5, (2) it is amorphous according to the analysis of its powder method X-ray diffraction diagram, (3) it has a BET specific surface area of 100 to 400 m<SUP>2</SUP>/g, (4) it has an alkali metal content of 0.1 wt % or less, and (5) it has an average particle diameter of 2 to 60 mum. According to the present invention, a purified polyether having an extremely low content of an alkali metal can be obtained effectively.
|
