Sika Technology Ag

Evonik Degussa Gmbh

Evonik Operations Gmbh

Thomas Müller

Steffen Krill

Frank Schubert

Christian Bürge

Beat Marazzani

Christophe Kurz

Thomas Heller

Martin Körfer

Arnd Eberhardt

Martin Steurenthaler

Dieter Honert

Stefan Merget

Rolf Hartung

Martin Steffan

Peter Richter

Roland Singer

Hans Knauber

Franz-Rudolf Kunz

Oliver Blask

Franz Hitzel-Zerrahn

Jörg Pietsch

Markus Müller

Manfred Bäuml

Anke Reinschmidt

Andreas Vetter

Inna König

Michael Macklin

Sabin Kruczek

In a method for producing hydrogen cyanide by passing a feed mixture comprising ammonia and methane through reaction tubes, coated on the inner surface with a catalyst comprising platinum, at a reaction temperature of 1000° C. to 1400° C., operated for a time period of at least 100 h, the concentration difference between the ammonia concentration and the methane concentration in the product gas mixture is maintained in a range of from 1.05 % by volume to 3.0% by volume for at least 80% of the time.

Method for producing hydrogen cyanide

A process for producing a setting and/or curing accelerator for mineral binders is characterized in that a mineral solid is subjected to milling in a liquid medium.

Hardening accelerator

An adjuvant combination composed of a milling assistant and a concrete admixture for a composition including cement, for accelerating cement hydration, wherein the milling assistant includes at least one amino alcohol and at least one cement hydration accelerator selected from chlorides, thiocyanates, nitrates, nitrites and hydroxides, and the concrete admixture includes a reaction product of at least one calcium compound with at least one silicon compound selected from a silicon dioxide compound, a silica compound and a silicate compound. Using the adjuvant combination produces a significant acceleration in the hardening of a composition including cement, after the addition of water. This is an advantage especially in the production of prefabricated concrete components, allowing quicker deshuttering.

Adjuvant combination of a milling assistant and a concrete admixture for accelerated hydration of cementitious binders

The reaction tube for preparing hydrogen cyanide comprises a cylindrical tube composed of ceramic, a catalyst comprising platinum applied to the inner wall of the tube and also at least one insert composed of ceramic, having three or four fins pointing from the tube axis to the inner wall of the tube, which is inserted into the cylindrical tube, wherein the fins divide the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean gap between the ends of the fins and the inner wall of the tube is in the range of 0.1 to 3 mm. In the method for preparing hydrogen cyanide, ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms are reacted in the reaction tube at 1000 to 1400&#xb0; C.

Reaction tube and method for producing hydrogen cyanide

A solubilizer is used to stabilize crude polyol produced from biomass.

Stabilization of crude polyols from biomass

A description is provided of the use of an additive including polycarboxylate ether and/or lignosulfonate as grinding aid in cement grinding for producing a cement, especially when fly ash and rock flour are used in the cement. The additive is preferably an aqueous additive. The use of the grinding aid in the production of the cement leads to improved processability of concrete or mortar produced from the cement. In particular, improved stiffening behavior, a reduced water requirement, or a reduced superplasticizer requirement for the mortar or concrete is obtained.

Grinding aid for cement clinker based on polycarboxylate ethers and/or lignosulfonates

A method for making a setting accelerator, especially for binders based on calcium sulfate, wherein gypsum together with at least one polycarboxylate is subjected to a dry grinding.

Setting accelerator for binders based on calcium sulfate

The present disclosure relates to the use of an amino alcohol A and/or of a salt of the amino alcohol A as an additive when grinding at least one solid. The amino alcohol A has a structure according to formula I where: Rand R, independently of one another, each present an alkanol group including 2-4 carbon atoms, and b) Ris a hydrocarbon group including 1-8 carbon atoms, and c) Ris different from Rand/or R.

Dialkanolamines as additives for grinding solids

The present invention focuses on a process for the hydrogenation of aromatic or heteroaromatic compounds and in particular on the ring hydrogenation of compounds having the formula (I). Aromatic amino acids and amino alcohols can be successfully ring-hydrogenated using a platinum-rhodium mixed catalyst. The products can be used inter alia as mimetics in bioactive peptide active ingredients.

Process for the hydrogenation of aromatic compounds

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Heidelberg, Germany

Thomas Müller