摘要:
A branched, high molecular-weight polyaryl-ether sulphone which is the reaction product of approximately equimolar amounts of an aromatic dialkali metal bishydroxylate and a bis-(halogen-aryl) compound, whose aryl nuclei are linked by sulphonyl groups, and about 0.01 to about 2 mol %, based on the bishydroxylate or bis-(4-halogenaryl) compound, of an aromatic compound having at least three aromatically linked alkali metal hydroxylate substitutents and/or of a halogenaryl compound having at least three aryl-linked halogen substituents and which is capable of substitution under the reaction conditions of polyaryl-ether sulphone manufacture.
摘要:
In a process for producing aliphatic .alpha.,.omega.-diols comprising 4 to 12 C atoms from aliphatic .alpha.,.omega.-dicarboxylic acids comprising 4 to 12 C atoms, an oligoester of average chain length n=3 to n=4.5 and with an acid number of 40 to 60 mg KOH/g reaction mixture is first formed from a diol and a dicarboxylic acid, which oligoester is thereafter catalytically hydrogenated in the liquid phase. Hydrogenation is carried out continuously at 180 to 250.degree. C. and at an H.sub.2 pressure of 100 to 400 bar, over a pelletised catalyst which is free from Zn oxide and which comprises pressed powders of Cu, Mn and Al oxides with a content of at least one oxide of metals of subgroup VI of the periodic table of the elements (Mendeleev). The amount of H.sub.2 is 20 to 100 times the amount required stoichiometrically.
摘要:
To prepare a mixture of cyclohexylamine and dicyclohexylamine by catalytic hydrogenation of aniline at elevated temperature and elevated H.sub.2 pressure, the catalyst system used comprises two reduced, unsupported catalysts A and B which are prepared from pressed element (hydr)oxide powders. Catalyst A comprises one or more of Fe, Co, Ni, also Mn, Cu and one or more of Ca, Sr, Ba. Catalyst B comprises one or more of Fe, Co, Ni, also Mn, Si and Mg.
摘要:
The preparation of optionally substituted diphenylamine by reaction of optionally substituted aniline with optionally substituted cyclohexanone using a supported Rh catalyst containing rhodium or a combination of rhodium with another platinum metal from the group of palladium, platinum, ruthenium or iridium and which can additionally contain chromium, manganese, alkali metal and a sulphur compound is described. The catalyst of the invention is prepared from halide-free starting materials. The Rh catalyst is distinguished by a low dependence of the initial selectivity, the selectivity in the run-in state and the running-in time on the conditions of the reductive pretreatment and requires only short running-in times to the optimum state.
摘要:
Cyclohexylamine and dicyclohexylamine can be prepared as a mixture with one another by reaction of phenol with aniline, ammonia or a mixture of aniline and ammonia in the presence of hydrogen over a catalyst, the reaction being carried out according to the invention over a palladium catalyst which has a support of niobic acid or tantalic acid or a mixture of niobic acid and tantalic acid or a support containing such acids. The reaction is carried out at 100.degree.-220.degree. C. under an H.sub.2 partial pressure of 0.5-500 bar.
摘要:
Optionally substituted diphenylamines can be obtained by reacting optionally substituted anilines with optionally substituted cyclohexanones over a supported catalyst at 200.degree.-450.degree. C. and 0.1-20 bar, the supported catalyst containing one or more metals having a dehydrogenating action selected from the group Ru, Pd, Os, Ir, Pt, Fe, Co, Ni, Re, Mn, Cu, Ag, Cr and Ce.
摘要:
A process for the preparation of d,l-menthol by catalytic hydrogenation of aromatic or partly hydrogenated cyclic compounds which have the carbon skeleton of menthol having at least one double bond and are substituted by oxygen in the 3-position relative to the methyl group, with simultaneous rearrangement of optically active or inactive stereoisomers of menthol at elevated temperature and under pressure is described. The hydrogenation, which is to be carried out continuously, is carried out on a fixed bed catalyst which comprises, as active constituents, palladium, ruthenium or rhodium or a mixture of these elements, and comprises alkali metal hydroxides and/or alkali metal sulphates as promoters; the support for this catalyst is doped with a rare earth metal and manganese.
摘要:
The sugar alcohols given in the title can be prepared in epimer-free form from the corresponding sugars by catalytic hydrogenation in aqueous solution using hydrogen, the hydrogenation being carried out continuously at 100-500 bar of H.sub.2 and 60.degree.-125.degree. C. on a fixed bed of carrier-free mouldings composed of pressed powders of the elements of the iron group of the periodic table. The mouldings have a compressive strength of above 50 N and an internal surface of 10-90 m.sup.2 /g.
摘要:
A continuous process for preparing isocamphyl-cyclohexanols from isocamphy-guaiacol or isocamphyl-phenol compounds by hydrogenating one of said compounds with hydrogen at elevated temperature and elevated pressure, comprising the use of support-free molded bodies which serve as catalysts and which are obtainable by reduction of molded bodies made of compressed powders of cobalt, manganese and copper (hydr)oxides and optionally of (hydr)oxides of the alkaline earth metals are used.
摘要:
To prepare isocamphylcyclohexanols by hydrogenating compounds containing the carbon skeleton of the isocamphylguaiacols or isocamphylphenols, oxygen-free and support-free molded bodies disposed in a fixed bed and made of compacted powders of the elements of the ferrous subgroup of group VIII of the periodic system or their mutual alloys or their alloys with elements of group VIB are used as catalysts; in addition, hydrogenationally inert elements may be present. The molded bodies have a compressive strength of 20 to 250N and an internal surface area of 10 to 90 m.sup.2 /g.