摘要:
A process for hydrogenating aromatic compounds in which at least one hydroxyl group is bonded to an aromatic ring comprises bringing at least one of these compounds into contact with free hydrogen in the presence of a catalyst, wherein the catalyst comprises ruthenium and, if desired, at least one metal of transition groups I, VII and VIII in an amount of from 0.01 to 30% by weight, preferably from 0.2 to 15% by weight, based on the total weight of the catalyst, applied to a support, where the support has a mean pore diameter of at least 0.1 .mu.m, preferably at least 0.5 .mu.m, and a surface area of at most 15 m.sup.2 /g, preferably at most 10 m.sup.2 /g.
摘要:
Catalysts are composed ofa) a magnetizable core,b) which may be coated with a binder andc) which carries catalytically active metals or metal compounds on its surface.
摘要:
Aromatic compounds in which at least one amino group is bonded to an aromatic nucleus are catalytically hydrogenated in the liquid phase by a process in which the catalyst consists essentially of ruthenium and, optionally at least one metal of subgroup I, VII or VIII in an amount of from 0.01 to 30% by weight, based on the total weight of the catalyst, applied to a carrier which has a mean pore diameter of at least 0.1 .mu.m and a surface area of not more than 15 m.sup.2 /g.
摘要:
Preparation of alkenes as well as of cyclopentane and cyclohexane from the corresponding vicinal dichloro and dibromo alkanes and from .alpha.,.omega.-Dichloropentane and .alpha.,.omega.-dibromopentane and .alpha.,.omega.-dichlorohexane and .alpha.,.omega.-dibromohexane respectively, in which these starting compounds are caused to react with with silicon.
摘要:
The preparation of an alkyl, alkenyl, or alkynyl chloride by the reaction of a corresponding alcohol with phosgene or thionyl chloride in the presence of a phosphine oxide acting as catalyst, wherein the catalyst used is an aliphatic, cycloaliphatic, or cyclic/aliphatic phosphine oxide.
摘要:
The present invention relates to a process for preparing 1,2-propanediol, in which a glycerol-containing stream, especially a stream obtained on the industrial scale in the production of biodiesel, is subjected to a low pressure hydrogenation.
摘要:
Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.
摘要:
The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene in the presence of a solvent, wherein ionic liquids are used as solvents.
摘要:
Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.
摘要:
The present invention relates to a process for preparing 1,2-propanediol, in which a glycerol-containing stream, especially a stream obtained on the industrial scale in the production of biodiesel, is subjected to a low pressure hydrogenation.