Basf Aktiengesellschaft

Ludwig Schuster

Walter Gramlich

Dieter Degner

Eberhard Ammermann

Jochem Henkelmann

Ernst-Heinrich Pommer

Werner Hoffmann

Albert Hettche

Thomas Wettling

Klaus Halbritter

Dieter Voges

Stefan Weiss

Ulrich Koehler

Wolfgang Lengsfeld

Werner Liedy

Leo Ehemann

Hubert Sauter

Franz Merger

Ulrich Mueller

Norbert Goetz

Karl Eicken

Wolfgang Hoelderich

Wolfgang Rohr

Bernd Wolf

Christoph Kuenast

Hans Theobald

Ernst Buschmann

Peter Horn

Peter Zehner

Peter Hofmeister

Walter Himmele

Tom Witzel

Herwig Hoffmann

Adolf Fischer

Eckhard Hickmann

Claus-Ulrich Priester

Irene Troetsch-Schaller

Rolf Schneider

Manfred Eggersdorfer

Herbert Stutz

Werner Hinz

Karl H Illers

Rolf Henn

Hermann Graf

Stefan Wolff

Dieter Tintelnot

Gerhard Koppenhoefer

Klaus Bittins

Bernhard Seid

Klaas Jansen

Dietrich Wolff

Paul Raff

Ernst Deuker

Rudolf Taddey

Klaus Vorspohl

Winfried Zombik

Rudolf R Schnur

Hans-Dieter Hoffmann

Werner Hoffman

Laurance Thurman

Edmund Niedbalski

Hanns-Helge Stechl

Richard Hardt

Serge Wack

Erich Flickinger

A process for breaking down aromatics in industrial wastewaters that contain small amounts of aromatics by reaction with an ozone-containing oxygen stream at a temperature of from 40 to 70&deg; C. and at a pH of from 4 to 7, involves treating industrial wastewaters that contain small amounts of aromatics in two stages with an oxygen stream that contains from 5 to 8% by volume of ozone with thorough mixing by causing the wastewater to flow upward through two reaction zones, the overflow of the wastewater at the top of the first reaction zone entering the second reaction zone at the base, the purified wastewater being obtained at the top of the second reaction zone, the ozone-containing oxygen stream first entering at the base of the second reaction zone, and the waste gas obtained at the top of the second reactor being introduced at the base of the first reaction zone, and, furthermore, a gas containing less than 0.2% by volume of ozone being obtained at the top of the first reaction zone.

Breaking down aromatic compounds in industrial wastewaters

Aromatic nitro compounds in waste waters from nitrobenzene production plants are degraded by treatment with ozone at 60-100&deg; C. 1.5-10 bar and pH 3 to 12.

Cleanup of nitroaromatics-containing wastewaters

A process for decoloring polyisocyanates containing isocyanurate and uretdione groups comprises treating the demonomerized polyisocyanates containing isocyanurate and uretdione groups with oxygen.

Decoloration of polyisocyanates containing isocyanurate and diretdione

A process for the preparation of 1,2-propanediol by catalytic hydrogenation of glycerol at elevated temperature and elevated pressure, which comprises using glycerol having a water content of up to 20% by weight and a catalyst comprising the metals cobalt, copper, manganese and molybdenum in amounts of, based on the total weight of the catalyst,

Preparation of 1,2-propanediol

A process for the selective hydrogenation of aromatic groups of organic molecules carrying at least one aromatic group and one epoxy group with hydrogen in the presence of a ruthenium-containing catalyst, in which the hydrogenation is carried out in the presence of from 0.2 to 10 wt % of water, based on the reaction mixture.

Selective hydrogenation of aromatic groups in the presence of epoxy

A process for the selective hydrogenation of aromatic groups of organic molecules carrying at least one aromatic group and one epoxy group with hydrogen in the presence of a ruthenium-containing catalyst, in which a homogeneous ruthenium catalyst is used which can be prepared by reducing the ruthenium compound with a metal having a redox potential of from -0.75 to 2.5 V, a boron hydride, an aluminum hydride, an aluminum alkyl compound, a lithium alkyl compound, or a lithium aryl compound in the presence of an ether.

The present invention relates to a process for the preparation of a hard foam containing urethane groups or urethane and isocyanurate groups by the polyisocyanate polyaddition process, by reacting

Polyoxypropylene-polyols and polyoxypropylene-polyoxyethylene-polyols

A process for the production of chlorofluorocarbon-free, urethane- or urethane- and urea-containing, soft-elastic, semirigid or rigid moldings having a cellular core and a compacted peripheral zone and an essentially pore-free, smooth surface involves reacting

Production of chlorofluorocarbon-free, urethane-containing moldings

Ruthenium tetroxide is obtained by oxidation of an alkali metal ruthenate in aqueous solution. The oxidizing agent used is ozone. The oxidation is carried out at a pH greater than or equal to 8.

Method of obtaining ruthenium tetroxide by oxidation of an aqueous

The invention relates to a process for preparing dialkyl malonates by ozonolysis of diketene, subsequent catalytic hydrogenation and esterification of the reaction products, the by-products being alkyl formates and dialkyl acetals.

Preparation of dialkyl malonates

Lower polyhydric alcohols are prepared by catalytic hydrogenolysis of sucrose in an aqueous solution by using a catalyst whose active material essentially consists of

Preparation of lower polyhydric alcohols

A process for the preparation of a 2,2-disubstituted pentane-1,5-diamine of the formula I ##STR1## where R.sup.1 and R.sup.2, independently of one another, are C.sub.1 - to C.sub.10 -alkyl or C.sub.2 - to C.sub.10 -alkenyl or together are a C.sub.4 - to C.sub.7 -alkylene chain which is unsubstituted or monosubstituted to pentasubstituted by C.sub.1 - to C.sub.4 -alkyl, from a 2,2-disubstituted 4-cyanobutanal of the formula II ##STR2## where R.sup.1 and R.sup.2 are as defined above, comprises, in two spatially separate reaction spaces,

Preparation of 2,2-disubstituted pentane-1,5-diamines

A process for the preparation of a 2-pyrrolidinone of the general formula I ##STR1## in which R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1 -C.sub.20 -alkyl, or C.sub.3 -C.sub.8 -cycloalkyl optionally substituted by C.sub.1 -C.sub.4 -alkyl, or phenyl optionally substituted by C.sub.1 -C.sub.4 -alkyl, by reacting a 3-cyanopropionate of the general formula II ##STR2## in which R.sup.1 and R.sup.2 have the meanings stated above and R.sup.3 denotes C.sub.1 -C.sub.8 -alkyl, with hydrogen at elevated temperature and pressure, wherein the reaction is carried out in the presence of ammonia and in contact with a catalyst containing cobalt, manganese, and phosphorus.

Preparation of 2-pyrrolidinones

A process for the preparation of lower polyhydric alcohols by catalytic hydrogenation of aqueous saccharose solutions at elevated temperature and pressure using a catalyst of which the catalytically active material essentially contains the metals cobalt, copper and manganese in the following concentrations, the total weight of said metals being standardized as 100%:

Process for the preparation of lower polyhydric alcohols

A process for the preparation of N-substituted pyrrolidin-2-ones of the general formula I ##STR1## where R.sup.1 is C.sub.1 - to C.sub.20 -alkyl, C.sub.6 - to C.sub.10 aryl or C.sub.7 - to C.sub.12 -aralkyl comprises hydrogenolytically cleaving 5-iminopyrrolidin-2-ones of the general formula II ##STR2## in which the R.sup.1 radicals are identical or different C.sub.1 - to C.sub.20 -alkyl, C.sub.6 - to C.sub.10 -aryl or C.sub.7 - to C.sub.12 -aralkyl, at super-atmospheric pressure and elevated temperature in the presence of a hydrogenation catalyst to give the pyrrolidin-2-ones I; specifically, the 5-iminopyrrolidin-2-ones of the formula II are obtained by reacting .beta.-cyanopropionic acid esters of the general formula III ##STR3## where R.sup.2 is C.sub.1 - to C.sub.20 -alkyl, C.sub.7 - to C.sub.12 -aralkyl or C.sub.6 - to C.sub.10 -aryl, with an amine of the general formula IV

Preparation of N-substituted pyrrolidin-2-ones

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Ludwig Schuster