Process for the preparation of polyols
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United States of America Patent
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Jul 15, 2003
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N/A
app pub date -
Jan 2, 2002
filing date -
Jul 2, 1999
priority date (Note) -
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Abstract
The invention relates to a process for the preparation of polyols having 3 or 4 hydroxyl groups, from an aldehyde and formaldehyde in the presence of water, followed by hydrogenation of the aldolisation product in the presence of a hydrogenation catalyst at an elevated temperature. The aledhyde is obtained by an aldolisation reaction of an aldehyde having at least two .alpha.-hydrogen atoms and a formula according to R.sub.1 CH.sub.2 CHO, wherein R.sub.1 is selected from a group comprising hydrogen, alkyl groups having 1-7 carbon atoms which can have cycloalkyl substituents, cycloalkyl groups, aryl groups and aralkyl groups with 1-7 carbon atoms is the alkyl chain, with formaldehyde in the presence of water in an amount of 20-70 wt %, preferably 40-60 wt % and in the presence of an anion exchange resin. The hydrogenation is preferably carried out in the presence of water.
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