Basf Aktiengesellschaft

Basf Se Corporation

Kai Michael Exner

Johann-Peter Melder

Reinhold Schwalm

Klemens Massonne

Thomas Daniel

Ulrich Riegel

Mark Elliott

Matthias Weismantel

Hartmut Hibst

Otto Machhammer

Mark Duda

Kirsten Dahmen

Dieter Urban

Laszlo Szarvas

Harald Laas

Jörg Pastre

Gunther Van Cauwenberge

Steffen Oehlenschlaeger

Ralf Noe

Wolfram Stüer

Ubbo Von Oehsen

Detlev Glas

Elke Geissler

Stefan Kirsch

Mark Elliot

A process for postcrosslinking a water-absorbing polymer comprises said polymer being treated with a postcrosslinker and, during or after said treating, being postcrosslinked and dried by temperature elevation, said postcrosslinker being a compound of the formula I where R, R, R, R, R, R, R, Rand Rare each independently hydrogen, C-C-alkyl, C-C-alkenyl or C-C-aryl, wherein C-C-alkyl, C-C-alkenyl or C-C-aryl may be halogen substituted. The liquid-absorbing polymers are useful in hygiene articles and packaging materials.

Method for the secondary crosslinking of hydrogels with bicyclic amide acetals

Disclosed is a process for postcrosslinking a water absorbing polymer by the polymer being treated with at least one postcrosslinker and postcrosslinked and dried during or after the treatment by raising the temperature, the at least one postcrosslinker being a cyclic carbamate or a cyclic urea, wherein the cyclic carbamate or the cyclic urea was obtained by reacting respectively an aminoalcohol or a diamine with a cyclic carbonate.

Postcrosslinking of water absorbing polymers with cyclic carbamates and/or cyclic ureas

Processes are described comprising: (i) providing a reactant comprising 1,2-dichloroethane; and (ii) reacting the reactant with ammonia to form a reaction product comprising one or more ethylene amines and hydrogen chloride, wherein the reaction is carried out in the presence of an organic, nitrogen- or phosphorus-containing compound which reacts with the hydrogen chloride to form an ionic liquid.

Processes for producing ethylene amines

The present invention relates to a process for preparing quaternary phosphonium salts by reacting a ternary phosphine with an optionally substituted, saturated or monounsaturated or polyunsaturated electrophile having from 3 to 25 carbon atoms in ternary solvent mixtures.

Method for producing phosphonium salts

Disclosed is a method for jointly producing (i) formic acid (III); (ii) a carboxylic acid comprising at least two carbon atoms (II) and/or the derivatives thereof; and (iii) a carboxylic acid anhydride (VII). According to said method, (a) a formic acid ester (I) is transesterfied to formic acid (III) and the corresponding carboxylic acid ester (IV) by means of a carboxylic acid comprising at least two carbon atoms (II); (b) at least one portion of the carboxylic acid ester (IV) formed in step (a) is carbonylated in order to obtain the carboxylic acid anhydride (V); and (c) at least one portion of the carboxylic acid anhydride (V) formed in step (b) is further dehydrated by means of a carboxylic acid (VI) so as to form a carboxylic acid anhydride (VII) and the carboxylic acid (II).

Flexible method for the joint production of (i) formic acid, (ii) a carboxylic acid comprising at least two carbon atoms and/or the derivatives thereof, and (iii) a carboxylic acid anhydride

The invention relates to a method for gel post-crosslinking or surface post-crosslinking water-absorbing hydogels with morpholine-2,3-diones, to the post-crosslinked hydrogels and to the use thereof.

Method for crosslinking hydrogels with morpholine-2,3-diones

A process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of an n-butene-containing hydrocarbon stream by means of oxygen-containing gases in a shell-and-tube reactor having two successive reaction zones, where the first, feed-side reaction zone contains at least one catalyst which is suitable for the oxydehydrogenation of n-butenes to 1,3-butadiene and the second, product-side reaction zone contains at least one catalyst which is suitable for the oxidation of 1,3-butadiene to maleic anhydride, is carried out using a shell-and-tube reactor which has at least one heat transfer medium circuit in the region of the first, feed-side reaction zone and at least one further heat transfer medium circuit in the region of the second, product-side reaction zone.

Method for producing maleic anhydride

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Eppelheim, Germany

Kai Michael Exner