公开(公告)号：US20200181017A1

公开(公告)日：2020-06-11

申请号：US16788389

申请日：2020-02-12

Applicant: Evonik Operations GmbH ,  SIKA TECHNOLOGY AG

Inventor： Frank Schubert ,  Anke Reinschmidt ,  Andreas Vetter ,  Sabina Kruczek ,  Dieter Honert ,  Thomas Müller ,  Inna König ,  Oliver Blask ,  Arnd Eberhardt

IPC: C04B20/10 ,  C08G63/66 ,  C04B28/02 ,  C04B24/08 ,  C04B24/32

Abstract: The invention relates to the use of carboxylic acid-based polyoxyalkylenes as low-emissions shrinkage reducers in mineral binders, to methods of reducing shrinkage and to corresponding compositions.

公开(公告)号：US11897781B2

公开(公告)日：2024-02-13

申请号：US16337156

申请日：2017-09-26

Applicant: EVONIK OPERATIONS GMBH

Inventor： Martin Steurenthaler ,  Martin Steffan ,  Thomas Müller ,  Manfred Bäuml

IPC: C01C3/02 ,  B01J12/00 ,  B01J19/24 ,  B01J23/42

CPC classification number: C01C3/0229 ,  B01J12/005 ,  B01J19/2425 ,  B01J23/42 ,  B01J2219/00038 ,  B01J2219/00051 ,  B01J2219/00182 ,  B01J2219/0883 ,  B01J2219/247

Abstract: 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.