摘要:
Trimethylolpropane is prepared in such a manner that butyraldehyde is metered into a mixture of water, alkaline condensing agent and formaldehyde, which contains less than 0.1 mol of methanol relative to 1 mol of formaldehyde, at temperatures from 15.degree. to 50.degree. C., and after addition of the butyraldehyde the reaction mixture is heated up to 90.degree. C., sufficient water being present in the reaction mixture so that the reaction mixture has a content of trimethylolpropane of 5 to 25% by weight after the reaction.
摘要:
A process for the preparation of 2,2-dimethylolalkanals is disclosed wherein formaldehyde is reacted with an aldehyde of the formulaRCH.sub.2 CHO (I)whereinR denotes a straight-chain or branched alkyl radical with up to 12 carbon atoms where the radical can be substituted by an alkyl or alkoxy group with 1 to 3 carbon atoms in each case wherein the molar ratio of aldehyde of formula I to formaldehyde is 1:8 to 20, the reaction being carried out at a temperature in the range of 5.degree. to 100.degree. C. in the presence of 0.01 to 0.5 mol (per mol of aldehyde of formula (I)) of a catalyst consisting essentially of a hydroxide or carbonate of an alkali metal or alkaline earth metal or an unbranched tertiary aliphatic amine.
摘要:
Substituted or unsubstituted cyclohexylamine and substituted or unsubstituted dicyclohexylamine can be produced by catalytic hydrogenation of substituted or unsubstituted aniline by using a ruthenium catalyst which in addition to ruthenium also contains palladium, platinum or palladium and platinum on a support from the group consisting of Al.sub.2 O.sub.3 and aluminum spinel treated with chromium and manganese and containing the noble metals in a total amount of 0.05-5% by weight and a weight ratio of Ru:Pd, Ru:Pt, or Ru:Pd/Pt of 1:9-9:1. All percentages are based on the total weight of the catalyst.
摘要翻译:取代或未取代的环己胺和取代或未取代的二环己胺可以通过使用钌催化剂通过催化氢化取代或未取代的苯胺来制备,钌催化剂除了钌之外还含有钯,铂或钯和铂在由Al 2 O 3和铝组成的组中的载体上 尖晶石用铬和锰处理并含有总量为0.05-5重量%,Ru:Pd,Ru:Pt或Ru:Pd / Pt的重量比为1:9-9:1的贵金属。 所有的百分比均基于催化剂的总重量。
摘要:
Water-insoluble chlorinated hydrocarbons can be largely degraded by mixing with nitric acid and heating to temperatures of 150.degree. C. to 350.degree. C. under pressures of 6 bar to 350 bar.
摘要:
A process for the purification of .epsilon.-caprolactam, wherein .epsilon.-caprolactam is treated with potassium permanganate in the presence of from 0.01 to 5% by weight of water, based on caprolactam, and subsequently crystallized from toluene, benzene, ethylbenzene or xylene.
摘要:
Object of the invention is a process for the treatment of a lactam distillation residue which contains boric acid in which a polyhydric alcohol is added to the crude lactam. By these means the formation of deposits and incrustations on the heating surfaces of the distillation apparatus can be prevented.
摘要:
Di-(4-aminocyclohexyl)-methane containing 15 to 25% by weight of the trans-trans isomer can be obtained by the catalytic hydrogenation of di-(4-aminophenyl)-methane at elevated temperature and elevated hydrogen pressure in the presence of a ruthenium-containing supported catalyst containing 0.05 to 5% by weight ruthenium on an Al.sub.2 O.sub.3 support which has been treated with compounds of rare earth metals and manganese.
摘要:
Optionally substituted cyclohexylamine and optionally substituted dicyclohexylamine can be obtained by the catalytic hydrogenation of optionally substituted aniline, a ruthenium catalyst which is supported in Al.sub.2 O.sub.3 treated with compounds of rare earth metals and of manganese and which has a ruthenium content of 0.05-5% by weight, relative to the total weight of the catalyst, being employed.
摘要翻译:任选取代的环己胺和任选取代的二环己基胺可以通过任选取代的苯胺的催化氢化获得,钌催化剂负载在用稀土金属和锰化合物处理的Al 2 O 3中,钌含量为0.05-5重量% ,相对于催化剂的总重量。
摘要:
A supported catalyst containing rhodium and compounds of chromium, manganese, alkali metals and, if appropriate, compounds of sulphur is prepared by first applying compounds of chromium and manganese to the catalyst support, subsequently heating the catalyst support thus charged to elevated temperatures and then impregnating it with a rhodium solution, drying it, treating it with an alkali metal solution and, if appropriate, applying sulphur compounds to the catalyst support thus treated. The supported catalyst thus prepared can be used for the dehydrogenation of compounds and/or compound mixtures consisting of completely and/or partly hydrogenated hydroxydiphenyl.
摘要:
A process for the preparation of a propane-1,3-diol, disubstituted in the 2-position, which comprises contacting an ethanal disubstituted in the 2-position, which ethanal has the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and denote optionally substituted alkyl, cycloalkyl, aralkyl or aryl radicals or an optionally substituted heterocyclic radical, or together denote an optionally substituted divalent hydrocarbon radical with formaldehyde in the presence of an acid ion exchanger and thereafter contacting the resultant reaction product with hydrogen under hydrogenation conditions.