22.
    发明专利
    未知

    公开(公告)号:DE50301629D1

    公开(公告)日:2005-12-15

    申请号:DE50301629

    申请日:2003-05-21

    Applicant: BASF AG

    Abstract: The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.

    23.
    发明专利
    未知

    公开(公告)号:BR0117175A

    公开(公告)日:2004-10-26

    申请号:BR0117175

    申请日:2001-11-15

    Applicant: BASF AG

    Abstract: The invention relates to a method for removing acetals containing formaldehyde from polyvalent alcohols, especially trimethylolpropane. The inventive method is characterised in that the polyvalent alcohol is liberated of low-boiling constituents after it has been produced by distillation, is then subjected to tempering and is repurified, preferably by means of distillation.

    27.
    发明专利
    未知

    公开(公告)号:AT334957T

    公开(公告)日:2006-08-15

    申请号:AT02792927

    申请日:2002-12-06

    Applicant: BASF AG

    Abstract: Trimethylolpropane is isolated from a reaction mixture which has been obtained by reaction of n-butyraldehyde with formaldehyde in the presence of a base and, if appropriate, hydrogenation of the resulting mixture by distilling the mixture by means of a dividing wall column or a distillation column with a precolumn or a distillation column with an after-column. The process has low capital costs and a low energy consumption and gives reduced formation of high-boiling by-products.

    28.
    发明专利
    未知

    公开(公告)号:BR0311166A

    公开(公告)日:2005-03-15

    申请号:BR0311166

    申请日:2003-05-21

    Applicant: BASF AG

    Abstract: The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.

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