| 摘要 |
The invention relates to a method for producing pure alpha-alkoxy-Omega-hydroxy-polyalkylene glycols, creating small impurities of the product on high-molecular a-Omega-di-hydroxy-polyalkylene glycols. The method is based on the use of high-boiling initiator alcohols of the following general structure R<SUB>2</SUB>-(OCH<SUB>2</SUB>CHR)<SUB>k</SUB>-OH wherein R<SUB>2 </SUB>represents an alkyl radical comprising between 1 and 4 C atoms, preferably R<SUB>2</SUB>-CH<SUB>3</SUB>, k represents a number between 1 and 10, preferably between 1 and 4, and R represents H, CH<SUB>3 </SUB>or an alkyl radical comprising between 2 and 4 C atoms, preferably R-H, CH<SUB>3</SUB>. The use of the cited initiator alcohols enables the mixture of a basic catalyst and an initiator alcohol to be dried in such a way that it has a very low water content, and thus to produce very low concentrations of unwanted a-Omega-di-hydroxy-polyalkylene glycol impurities.
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