Abstract:
A chemical compound of the general formula I or II is useful as feed additive: wherein X=O or NR, and R=H, C1-C6-alkyl (optionally branched), C3-C6-cycloalkyl, aryl, or aralkyl, and wherein R1, R2, are identical or different and in each case H, C1-C6-alkyl (optionally branched), C3-C6-cycloalkyl, allyl, aryl, or aralkyl; or R1 and R2 together are an C2- to C6-alkylene group (optionally C1-C6-alkyl substituted).
Abstract:
The present invention relates to a process for preparing acrolein from propylene by catalytic gas phase oxidation with molecular oxygen (for example air). The invention further relates to the use of particular propylene-containing starting materials, for example refinery grade propylene, for preparation of acrolein.
Abstract:
A method for preparing α-keto acids, especially α-ketomethionine, and/or derivatives thereof, whereby an aldehyde is reacted with thiols to give a corresponding dithioacetal, the dithioacetal formed, is reacted with an electrophile in the presence of a strong base, and the resulting α,α-(dithio)carboxylic acid is solvolyzed with acid-catalysis to release thiol and give the α-keto acid or a derivative thereof. Umpolung of aliphatic or aromatic aldehydes is effected by reaction with thiols.
Abstract:
A mobile collecting device (22) for the high-pressure water jet (26) of a water-jet tool (18), especially for working in confined places with difficult access in turbines or the like, in which a more flexible and safer operation is achieved by a closed collecting chamber (24), which extends over a large area and includes an outlet (30), and in which a rigid first collecting bed (34) formed of a first high-pressure-resistant material is arranged.