摘要:
A method of separating hydrogen from mixture with at least one gas selected from the group consisting of methane and its higher homologs, nitrogen, noble gases, CO, CO.sub.2, O.sub.2, NH.sub.3, H.sub.2 O, and H.sub.2 S, comprising contacting the mixture with active magnesium thereby selectively to absorb the hydrogen by forming magnesium hydride, separating the unabsorbed gas from the magnesium hydride, heating the magnesium hydride thereby to desorb the hydrogen in purified form and regenerate active magnesium from the hydride, and recovering the desorbed hydrogen.
摘要:
The invention includes novel alkali metal complex compounds (and processes for their preparation) which are useful, inter alia for the hydrogenation of alkali metals at room temperature or below room temperature to form hydrides or nitrides.
摘要:
Optically active compounds are prepared from optically inactive unsaturated hydrocarbons by reacting at least one unsaturated hydrocarbon in the presence of a catalyst prepared by combining a nickel compound, a Lewis acid and an optically active phosphine of the general formulaPR'R"R"'in which R', R" and R"' are hydrocarbon radicals, thereby forming optically active compounds having chiral centers formed by the carbon-to-carbon linkages. The optically active compounds can be polymerized to provide optically active polymers.
摘要:
Grignard compounds from aromatic chlorine compounds and magnesium metal in the presence of a transition metal/magnesium chloride complex as a catalyst.
摘要:
A method of preparing an active magnesium-hydride or magnesium hydrogen-storer system which can reversibly take up H.sub.2, comprising contacting finely divided magnesium hydride or metallic magnesium with a solution of a metal complex or of a metal-organic compound of a transition metal of Subgroups IV-VIII of the periodic table, and then removing the solution. The product performs better with regard to speed and efficiency upon repeated hydrogenation and dehydrogenation, as in hydrogen storage and evolution.
摘要:
The present invention relates to a process for preparing a finely divided, highly reactive magnesium from magnesium hydride, magnesium anthracene and/or its derivatives or magnesium butadiene and/or its alkyl or phenyl derivatives, which process is characterized in that the respective magnesium-containing compound is thermally decomposed at a pressure from 10.sup.-6 to 1 bar, the decomposition being carried out in the presence of a co-reactant of a consecutive reaction, or such co-reactant being added only after completion of the precipitation of the magnesium, or in the absence of such co-reactant, the magnesium obtained by said decomposition being isolated as a powder, and to the use of the finely divided, highly reactive magnesium for inserting magnesium into poorly reactive C-X bonds, wherein X denotes heteroatoms such as halogen, oxygen, sulfur, nitrogen, phosphorus, and the resulting organomagnesium compound may be used in a consecutive reaction according to a per se known method, and for the reversible preparation of active magnesium hydride by reaction with molecular hydrogen at a pressure of from 1 to 2 bar and at a temperature of from 150.degree. C. to 250.degree. C.
摘要:
The invention relates to a process for the production of complex compounds of the transition metals which is characterized in that transition metals are reacted with magnesium, to which a catalytic quantity of anthracene and/or magnesium anthracene has been added as activator, in the presence of complexing ligands.
摘要:
A method of preparing an active magnesium-hydride or magnesium hydrogen-storer system which can reversibly take up H.sub.2, comprising contacting finely divided magnesium hydride or metallic magnesium with a solution of a metal complex or of a metal-organic compound of a transition metal of Subgroups IV-VIII of the periodic table, and then removing the solution. The product performs better with regard to speed and efficiency upon repeated hydrogenation and dehydrogenation, as in hydrogen storage and evolution.
摘要:
A catalytic system is provided for the lithiation of .alpha.-olefins and .alpha.,.omega.-diolefins with concurrent production of lithium hydride. The catalysts include oxygen and sulfur containing organic compounds and polycyclic aromatics which can be combined with alkali metal and/or transition metal compounds. High yields of pure and stereospecific lithiated olefins are obtainable.