Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

E.i. Dupont De Nemours and Company

Magellan Systems International LLC

Georg Martin

Reinhold M Klipper

Michael Schelhaas

David J Rodini

Herbert Diehl

Doetze Jakob Sikkema

Pierre Vanhoorne

Ralf Demuth

Andreas Krebs

Steven R Allen

Hasan Dindi

Eberhard Zirngiebl

Alfred Mitschker

Wolfgang Zarges

Bernd Koop

James Arnold Schultz

Guido Giffels

Erich Hammerschmidt

Holger L&uuml;tjens

Joerg-Dietrich Jentsch

Lutz Frohn

Michael Pies

Hans-Karl Soest

Ulrich Litzinger

Qinghong Fu Adkins

Michael Holzbrecher

Areski Rezkallah

Joachim Westen

Wilfried Jaworek

Uwe Boeger

Hans Karl Soest

Markus Koschorreck

Guido Issling

Sladjana Baljak

Uwe Böger

The invention relates to a process for preparing aminomethylated bead polymers using condensed formaldehydes and carbonyl halides.

Method for producing amino methylated bead polymerizates

The invention relates to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents and to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents for their recycled use during the ion exchanger production process. The diammonium phthalate is prepared by making use of the phthalic add salts solution resulted from the on exchanger production process.

Process for the production of phthalimides

The present invention relates to chelating resins containing methyleneaminoethylsulfonic acid groups, a process for producing them and also their use for removing heavy metals or metals of value from aqueous solutions having a pH of &#x3c;4, preferably from process water in or from the electronics industry, the electroplating industry or the mining industry.

Methylene aminoethyl sulfonic acid chelating resins

The present invention relates to novel amphoteric ion exchangers which possess not only phthalamide groups of the formula (I) but also &#x2014;(CH)NRRgroups and/or if appropriate &#x2014;(CH)NRRRgroups, wherein m is an integer from 1 to 4 and R, R, Rin each case independently of one another are hydrogen, &#x2014;CH, &#x2014;CHCH, &#x2014;CHCHCH, benzyl, &#x2014;OCHCHor &#x2014;CHCHOH and X is H or Na or K, to a process for production thereof and also use thereof.

Amphoteric ion exchangers

Disclosed are processes for preparing monomer complexes that include contacting 2,3,5,6-tetraminopyridine free base in water with 2,5-dihydroxy terephthalic acid dipotassium salt to form an aqueous mixture, and adjusting the pH of the aqueous mixture to within the range of from about (3) to about (5) to precipitate the monomer complex. Processes of polymerizing the monomer complexes, polyareneazoles, filaments and yarns are also disclosed.

Process for preparing monomer complexes

Disclosed are processes for preparing polyareneazole polymers including contacting a molar excess of a free base in water with a terephthalic acid salt to form an aqueous mixture, adjusting the pH to precipitate a monomer complex, contacting the monomer complex with metal powder, and polymerizing the monomer complex. Polyareneazoles, filaments and yarns are also disclosed.

Processes for increasing polymer inherent viscosity

The present invention relates to a process for preparing gel-like anion exchangers by aminating crosslinked gel-like styrene divinybenzene bead polymers that contain halogenoalkyl groups in the presence of an inorganic salt and in the absence of organic solvents.

Method for producing osmotically and mechanically stable gel-like anion exchangers

Piperidines are prepared in an advantageous manner by catalytic hydrogenation of activated pyridines in the presence of palladium catalysts if the palladium catalyst is palladium-on-carbon and the solvents are aromatic hydrocarbons.

Process for preparing piperidines

Cis-R-dioxo-benzylpyrrolopiperidine is racemized in a particularly advantageous manner by treating it with a substoichiometric amount of base, preferably at temperatures below about 40&deg; C.

Racemization of R,S-dioxo-benzylpyrrolopiperidine

Succinic anhydride (SA) can be prepared by catalytic hydrogenation of maleic anhydride (MA) with hydrogen in the liquid phase, by reacting a starting material composed of from 5 to 100% by weight of MA and from 95 to 0% by weight of SA, based on the total weight of MA and SA, at from 120.degree. to 150.degree. C. and a H.sub.2 pressure of from 10 to 150 bar over a Raney skeleton catalyst or a platinum group metal catalyst.

Process for preparing succinic anhydride

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Langenfeld, Germany

Georg Martin