Basf Aktiengesellschaft

Basf Se Corporation

Fertiva Gmbh

Eurochem Agro Gmbh

Ralf-Thomas Rahn

Alexander Weck

Gerd Kaibel

Rolf-Hartmuth Fischer

Holger Borchert

Stephan Schlitter

Rolf Pinkos

Frank Stein

Jochem Henkelmann

Alexander Wissemeier

Markus Rösch

Rolf Hartmuth Fischer

Michael Hesse

Harald Rust

Udo Rheude

Wolfram Zerulla

Gregor Pasda

Wolfgang Weigelt

Markus R&ouml;sch

Klaus Harth

Karl Haeberle

Frank Dietsche

Manfred Stroezel

Thomas Ruhl

Karl-Heinrich Schneider

Marc Heider

Stephan Hüffer

Ansgar Gereon Altenhoff

Dietmar Haering

Michael Jolyon Sprague

Melanie Brunner

Susanne Stutz

Wolfgang Steiner

Markus Hölzle

Oliver Huttenloch

Eckehard Danz

Christian Kuhrs

Thomas Grassler

Patrick Deck

Thomas R&uuml;hl

Steffen Tschirschwitz

Karl Häberle

Claudia Klodwig

Daniella Lohe

Michael Mauss

Michael Mauβ

Reiner Geier

Christian Carlos Miyagawa

Gerd Buehler

Achim Reddig

Dietmar Häring

Gerd Bühler

Compositions with improved urease-inhibiting effect comprising (thio)phosphoric acid triamide and further compounds

A mixture for the treatment of urea-containing fertilizers comprises a) at least one (thio)phosphoric acid triamide of the general formula (I) RRN&#x2014;P(X)(NH)and/or (thio)phosphoric acid diamide of the general formula (II) RO&#x2014;P(X)(NH), X denoting oxygen or sulfur, Rand Rindependently from each other being hydrogen, substituted or unsubstituted 2-nitrophenyl, C-alkyl, C-cycloalkyl, C-heterocycloalkyl, C-aryl, C-heteroaryl or diaminocarbonyl, where Rand Rtogether with the nitrogen atom connecting them can also form a 5 or 6-membered saturated or unsaturated heterocyclic group, which optionally may also comprise one or two additional heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, as component A, and b) at least one compound comprising an amino group having a boiling point of more than 100&#xb0; C. as component B.

Mixture for the treatment of urea-containing fertilizers

The invention relates to a bleach system comprising at least one component selected from bleach, bleach activator or bleach catalyst, wherein the bleach system is enveloped with at least one polymer layer and the polymer has urethane and urea groups. The inventive bleach system and detergent formulations comprising this bleach system are suitable for washing or cleaning textiles or dishware.

Bleach systems enveloped with polymeric layers

The invention relates to preparations with improved urease-inhibitory effect which comprise at least two different (thio)phosphoric triamides and to urea-comprising fertilizers which comprise these preparations. The invention furthermore relates to a method of preparing these preparations, to the use of these preparations in the fertilization with urea-comprising fertilizers, and to the use of urea-comprising fertilizers which comprise these preparations in agriculture or in horticulture.

Preparations with improved urease-inhibiting effect and urea-containing fertilizers containing the latter

The present invention relates to a process for the catalytic preparation of melamine by decomposition of urea over particular solid catalysts using a main reactor and an after-reactor. A catalyst having a low Lewis acidity is used in the main reactor and a catalyst having an equal or preferably higher Lewis acidity is used in the after-reactor.

Two-stage reactor for the production of melamine

A catalyst for the hydrogenation of C-dicarboxylic acids and/or their derivatives, preferably maleic anhydride, in the gas phase comprises from 5 to 100% by weight, preferably from 40 to 90% by weight, of copper oxide and from 0 to 95% by weight, preferably from 10 to 60% by weight, of one or more metals or compounds thereof selected from the group consisting of Al, Si, Zn, Pd, La, Ce, the elements of groups III A to VIII A and groups I A and II A as active composition applied in the form of a thin layer to an inert support material.

Catalytic coating for the hydrogenation of maleic anhydride and related compounds to give &#x3b3;-butyrolactone, tetrahydrofuran and derivatives thereof

C-dicarboxylic acids or derivatives thereof are hydrogenated in the gas phase in a fluidized-bed reactor. It is possible to use catalyst compositions known per se.

Method for the hydrogenation of maleic anhydride and related compounds in a fluid bed reactor

A hydrogenation catalyst which is suitable, in particular, for the hydrogenation of maleic anhydride and its derivatives to THF or its derivatives comprises copper oxide and at least one further metal or compound thereof, preferably an oxide, selected from the group consisting of Al, Si, Zn, La, Ce, the elements of groups IIIA to VIIIA and the elements of groups IA and IIA and having a pore volume of &#x2267;0.01 ml/g for pore diameters of &#x3e;50 nm and a ratio of the pore volume of macropores having a diameter of &#x3e;50 nm to the total pore volume for pores having a diameter of &#x3e;4 nm of &#x3e;10%.

Porous catalyst for the hydrogenation of maleic anhydride to tetrahydrofuran

In a process for the continuous fractional distillation of mixtures comprising tetrahydrofuran, &#x3b3;-butyrolactone and/or 1,4-butanediol to give at least three fractions, the fractionation is carried out in an assembly of distillation columns comprising at least one dividing wall column or at least one assembly of thermally coupled conventional distillation columns.

Method for distillative separation of mixtures containing tetrahydrofuran, &#x3b3;-butyrolactone and/or 1,4-butanediol

The present invention relates to a process for the gas-phase hydrogenation of C -dicarboxylic acids and/or their derivatives over a catalyst based on copper oxide to give substituted or unsubstituted &ggr;-butyrolactone and/or tetrahydrofuran, which comprises, which a first reaction zone in which the C -dicarboxylic acid and/or its derivatives is/are reacted to give a mixture comprising a substituted or unsubstituted &ggr;-butyrolactone as main product and a subsequent second reaction zone in which the substituted or unsubstituted &ggr;-butyrolactone present in the mixture from the first hydrogenation step is reacted at a temperature lower than the temperature in the first hydrogenation step to give substituted or unsubstituted tetrahydrofuran.

Method for the hydrogenation of maleic anhydride and related compounds in two serial reaction zones

Unsubstituted or alkyl-substituted THF is obtained by catalytic hydrogenation in the gas phase of C -dicarboxylic acids and/or their derivatives using a catalyst comprising <80% by weight, preferably <70% by weight, in particular from 10 to 65% by weight, of CuO and >20% by weight, preferably >30% by weight, in particular from 35 to 90% by weight, of an oxidic support having acid centers, at a hot spot temperature of from 240 to 310&deg; C., preferably from 240 to 280&deg; C., and a WHSV over the catalyst of from 0.01 to 1.0, preferably from 0.02 to 1, in particular from 0.05 to 0.5, kg of starting material/l of catalyst x hour.

Method for the production of tetrahydrofuran

In a process for preparing 1,4-butanediol, tetrahydrofuran and &ggr;-butyrolactone by oxidation of butane to give a product stream comprising maleic anhydride, absorption of maleic anhydride from the product stream using a high-boiling alcohol to give a liquid absorption product comprising monoesters and diesters of maleic acid and also high-boiling alcohol, after-esterification of the liquid absorption product and subsequent hydrogenation of the after-esterified product in the liquid phase, the high-boiling alcohol is a polyhydric alcohol having a boiling point at atmospheric pressure of above 233&deg; C. and the after-esterified product has an acid number of less than 30 mg KOH/g and a water content of less than 1% by weight.

Method for producing mixtures of 1,4-butanediol, tetrahydrofuran and &ggr;-butyrolactone

A process for preparing 1,4-butanediol and, if desired, &ggr;-butyrolactone and THF by oxidizing butane or benzene to form a product stream including maleic anhydride, absorbing maleic anhydride from the product stream with a high-boiling inert solvent in an absorption stage to give a liquid absorption product, esterifying the liquid absorption product with a C -C esterifying alcohol in an esterification stage to form an esterification product comprising the corresponding diester and high-boiling inert solvent, then hydrogenating the esterification product to give a hydrogenation product which comprises the products of value, 1,4-butanediol and, if desired, &ggr;-butyrolactone and tetrahydrofuran and the esterifying alcohol and which is separated by distillation into the products of value and the esterifying alcohol, and recycling the esterifying alcohol to the esterification zone, which comprises separating the esterification product into the diester and the inert solvent by distillation under reduced pressure prior to the hydrogenation, recycling the inert solvent to the absorption stage, and hydrogenating the diester in the liquid phase over a fixed-bed catalyst.

Method for producing 1,4-butanediol

Method for producing butyrolactones

The invention relates to a process for the separation of maleic anhydride from the maleic anhydride-containing reactor offgases from the preparation of maleic anhydride by the oxidation of hydrocarbons, in which this gas stream is brought into contact with a high-boiling, inert absorbent for maleic anhydride and maleic anhydride is separated from the resultant liquid absorbate phase by vapor stripping, where the stripping agent used is an alcohol, and at least some of the maleic anhydride is reacted with the alcohol to give the ester.

Method for separating maleic anhydride from maleic anhydride-containing mixtures by stripping

Growing community of inventors

Mannheim, Germany

Ralf-Thomas Rahn