Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Ec Erdoelchemie Gmbh

Ingal International Gallium Gmbh

Bayer Do Brasil S.a.

Przedsiebiorstwo Produkcyjno-consultingowe Adob Sp. Z O.o. Sp. K.

Adob Przedsiebiorstwo Produkcyjno-consultingowe Limited Partnership Company

Alfred Mitschker

Peter M Lange

Reinhold M Klipper

Harold Heller

Friedrich Werner

Heiko Hoffmann

Ulrich Schnegg

Franz-Rudolf Minz

Holger L&uuml;tjens

Hans-Karl Soest

Wolfgang Podszun

Rudolf Merten

Kirkor Sirinyan

Guido Steffan

Torsten Groth

Herbert Voege

Martin Scheer

Stefan Antons

Berthold Keggenhoff

Holger Lutjens

Bernhard Schleppinghoff

Olaf Halle

Siegfried Oeckl

Axel Ingendoh

Gunther Ellendt

Thomas Menzel

Werner Struver

Wolfgang Wirth

Hubert Rast

Georg Martin

Marcel Petinaux

Friedrich Martinola

Thomas Klein

Christian Gabel

Rudolf Uchdorf

Arundev H Naik

Lothar Feistel

Gunter Siegers

Ulrich Kappler

Claudia Schmid

Bruno Schulwitz

Michael Holzbrecher

Hans-Joachim Kramer

Uwe Beck

Wilhelm Bruening

Werner Strüver

Holger Lütjens

Andries P Van Der Meer

Werner Horlitz

Rüdiger Seidel

R&uuml;diger Seidel

Adam Nawrocki

Ralf-Johann Moritz

Gunter Lossmann

Cornelius J Smit

Fred Ebert

Hans-Ludwig Niederberger

Axel Schafer

Herbert V Diehl

Wolfgang Kreiss

Andreas Grafe

By Birgit Hartung-Merse, Heir

Sigurd Hartung, Deceased

The invention relates to a process for the preparation of iminodisuccinic acid ammonium metal salts, characterized in that, in a first stage, maleic anhydride (MA), alkali metal hydroxide and water are mixed in the molar ratio of 2:0&#x2013;3:5&#x2013;30 and then ammonia is metered in in the ratio MA: ammonia 2:1.5&#x2013;8, in order to obtain iminodisuccinic acid ammonium salts which, in a second stage, are reacted with metal oxides, metal hydroxides (and) or other metal salts or their mixtures to give iminodisuccinic acid ammonium metal salts of the formula 8,IDA(NH)(Na)(K)(Me).(NH)Formula 8in which

Preparation and use of iminodisuccinic acid ammonium metal salts

The present invention relates to a process for preparing novel, monodisperse anion exchangers by

Process for preparing monodisperse anion exchangers

The present invention relates to a process for preparing novel, monodisperse anion exchangers having strongly basic functional groups either in the center of the resin particle or in the shell of the resin particle, as well as to their use.

Process for preparing monodisperse anion exchangers having strongly basic functional groups

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

The invention relates to a process for preparing substantially monodisperse crosslinked bead polymers useful as precursors for ion exchangers.

Process for preparing monodisperse crosslinked bead polymers

Weakly basic anion exchangers of the poly(meth)acrylamide type which have been prepared by aminolysis of poly(meth)acrylonitrile or poly(meth)acrylate with polyamines of defined composition have an improved absorption capacity for sulphate ions and are suitable for selectively removing sulphate ions from aqueous liquids, in particular from sodium chloride brine and from waste waters.

Weakly basic anion exchangers, processes for their preparation by

An improved aminomethylation process gives weakly-basic anion exchangers in an elegant way, with by-product obtained being able to be processed into a suitable starting material without problems.

Process for preparing weakly-basic anion exchangers and reagents

Process of removing sulfate ions from water with a poly(meth)acrylamide

According to the process according to the invention for the preparation of anion exchange resins of the poly(meth)acrylamide type by aminolysis of bead polymers of cross-linked poly(meth)acrylic acid esters with excess polyamine, subsequent separation of the anion exchange resins from the liquid phase containing the unreacted polyamine, washing the anion exchangers free of amine with water and recovering the polyamines from the washing waters, the liquid phase containing the unreacted polyamine and the polyamine-containing washing waters are immediately mixed with the bead polymer of cross-linked poly(meth)acrylic acid ester to be subjected to aminolysis, the amount of fresh polyamine necessary for the establishment of the desired polyamine excess is added to the mixture, the mixture thus obtained is distillatively dewatered until its water content has fallen to a value of &lt;7% by weight and the mixture remaining after this distillative dewatering is subjected to aminolysis in the customary manner.

Process for the preparation of anion exchange resins of the

The invention relates to an environment-friendly process for the preparation of weakly acid cation exchange resins by hydrolysis of crosslinked acrylonitrile bead polymers with an alkaline hydrolizing agent at elevated temperature, according to which the bead polymer and alkaline hydrolizing agent are brought together at elevated temperature only.

Process for the preparation of weakly acid cation exchange resins

Known antibacterial quinolonecarboxylic acid derivatives such as ciprofloxacin are administered to animals in their food in the form of weak cation exchangers loaded therewith. The taste is much improved and the animals accept the material more readily.

Preparation and use of ion exchange resins loaded with

In the removal of pure aromatics from aromatic-containing hydrocarbon mixtures by liquid-phase extraction or extractive distillation using a selective solvent, the specific cost of separation can be reduced at the same yield of aromatics or the yield of aromatics can be increased at the same specific cost of separation if the liquid-phase extraction or the extractive distillation is carried out in the presence of a reactive solid. At the same time, substantially aromatic-free raffinates are obtained.

Process for removing pure aromatics

Tert.-olefins are obtained in high purity by cleavage of their alkyl ethers, when the catalysts used for this purpose are styrene/divinylbenzene resins which contain sulphonic acid groups and have a macroporous structure and the polymer matrix of which has an internal surface area of at least 400 m.sup.2 /g, a pore volume (porosity) of 0.6-2.5 ml/g and a mean pore diameter of 40-1000 .ANG.. These catalysts show long service lives.

Process for the preparation of tert.-olefins

A process for the preparation of a bifunctional anion exchange resin by partial quaternization of a weakly basic anion exchanger containing tertiary amino groups which process comprises (a) partially loading the weakly basic anion exchanger with a strong acid and (b) quaternizing the partially loaded anion exchanger by means of a customary alkylating agent.

Process for the preparation of bifunctional anion exchange resins, new

In the process for recovering gallium from aqueous, alkaline solutions by adsorption of the gallium on to bead-polymerized synthetic resins impregnated with 8-hydroxyquinolines and elution thereof with aqueous acids, the synthetic resins employed according to the invention are macroporous polydivinylbenzene or macroporous divinylbenzene copolymers which have been obtained by bead polymerization of divinylbenzene or mixtures of aromatic mono-, di- and/or trivinylbenzenes containing at least 50% by weight of divinylbenzene, in the presence of methyl isobutyl ketone, and which have been loaded with 160-190 g of Kelex 100 per liter of resin; in addition the resin is washed with sodium hydroxide solution after the elution step and before the commencement of each individual service cycle.

Process for recovering gallium

Growing community of inventors

Odenthal-Holz, Germany

Alfred Mitschker