Method for reducing the surface tension of aqueous solutions

    公开(公告)号:DE3446720A1

    公开(公告)日:1986-06-26

    申请号:DE3446720

    申请日:1984-12-21

    Applicant: HOECHST AG

    Abstract: In the novel method, the aqueous solutions of organic or inorganic salts are admixed, in order to reduce surface tension, with a reaction product from polyglycerol and fatty acid, which product has been obtained by (a) first condensing glycerol under normal pressure up to a hydroxyl value of from 1350 to 1100, (b) distilling the condensation product obtained in step (a), in order to remove low-boiling compounds, at a vacuum of from 50 to 2000 Pa until the bottom product has a hydroxyl value of from 1050 to 900, (c) further condensing at atmospheric pressure, the bottom product obtained in step (b) up to a hydroxyl value of from 890 to 800 and (d) esterifying the polyglycerol mixture obtained in step (c) up to a hydroxyl value of from 800 to 750 and an acid value of at most 0.7.

    METHOD FOR REDUCING THE SURFACE TENSION OF AQUEOUS SOLUTIONS

    公开(公告)号:ZA859733B

    公开(公告)日:1986-08-27

    申请号:ZA859733

    申请日:1985-12-20

    Applicant: HOECHST AG

    Abstract: In the novel method, the aqueous solutions of organic or inorganic salts are admixed, in order to reduce surface tension, with a reaction product from polyglycerol and fatty acid, which product has been obtained by (a) first condensing glycerol under normal pressure up to a hydroxyl value of from 1350 to 1100, (b) distilling the condensation product obtained in step (a), in order to remove low-boiling compounds, at a vacuum of from 50 to 2000 Pa until the bottom product has a hydroxyl value of from 1050 to 900, (c) further condensing at atmospheric pressure, the bottom product obtained in step (b) up to a hydroxyl value of from 890 to 800 and (d) esterifying the polyglycerol mixture obtained in step (c) up to a hydroxyl value of from 800 to 750 and an acid value of at most 0.7.

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