摘要:
Stoichiometric and catalytic chemical transformations may be carried out in solution using novel fluorous multiphase systems (FMS). The term "fluorous" is defined as a carbon-fluorine bond rich organic molecule which is generated by replacing hydrogen atoms bonded to carbon atoms with fluorine. The novel complexes suitable for use as fluorous catalysts and reagents in the present invention contain sufficient number of fluorous moieties to render them preferentially soluble in the appropriate fluorous solvent without impairing the ability of the catalyst or reagent to be effective or participate in the corresponding reaction. Thus, a variety of fluorous compositions may be prepared according to the present invention, included among them are complexes selected from the group consisting of perfluoroalkylphthalocyaninato metal complexes wherein the metal is selected from ruthenium, iron, cobalt, osmium, rhodium and iridium; (perfluoro-alkyl) 5, 10, 15, 20-tetrakis-pentafluorophenyl porphyrin metal complexes selected from ClM{P[(CH.sub.2).sub.n (CF.sub.2) CF.sub.3 ].sub.3 }.sub.3, ClM{P[O(CH.sub.2).sub.n (CF.sub.2).sub.m CF.sub.3 ].sub.3 }.sub.3, HM(CO).sub.x {P[(CH.sub.2).sub.n (CF.sub.2) .sub.m CF.sub.3 ].sub.3 }.sub.4-x, and HM(CO).sub.x {P[O(CH.sub.2).sub.n (CF.sub.2).sub.m CF.sub.3 ].sub.3 }.sub.4-x, wherein in each occurrence M is selected from cobalt, rhodium, iron, osmium, and iridium, x ranges from 1-3, (CH.sub.2).sub.n may be present or absent and when present n ranges from 1-5, and m ranges from 4-20.
摘要:
A process for the continuous preparation of silicon-base complex ferrous alloys from cheap raw materials by preparing a charge with a high electric resistance and reducing the same in an electric arc furnace. A charge is assembled which contains the total amount of carbon in a 0.82 to 0.99-fold quantity of that required to reduce all oxides of the charge to elements and achieving this carbon content by preparing pellets which, in addition to the binding material, contain(a) as oxide to be reduced in an amount of at least 50% by weight such oxides of only base-forming or only amphoteric or only acid-forming elements which form with each other compounds or eutectics melting above 1600.degree. C., and(b) a carbonaceous reducing agent and/or carbides in such an amount that the quantity of carbon is either 1.05 to 1.35 times higher than required to transform the oxides of the pellet to the carbides or 0.66 to 0.02-fold of the quantity required to reduce the oxides of the pellet to metallic elements, and assembling the charge(.alpha.) from pellets containing an excess of carbon and/or from lumpy carbides and(.beta.) from carbon-deficient pellets or from a lumpy oxide of a base-forming or amphoteric or acid-forming element and(.gamma.) from lumpy carbon carriers, and optionally(.delta.) from an iron additive, in the absence of boron trioxide.
摘要:
The invention relates to a new process for the simultaneous production of magnesium and cement from calcined dolomite or calcium and cement from calcined lime. According to the invention calcined dolomite or calcined lime is reduced under a pressure lower than 10 torr and at a temperature of 1300.degree. to 1600.degree. C. with a reducing agent containing silicon and aluminum in a weight ratio of 4:1 to 1:1, wherein the total amount of silicon and aluminum comprises 50 to 100% by weight. 100 to 200 parts by weight of the reducing agent are applied to convert 600 to 800 parts by weight of calcined dolomite or 700 to 1000 parts by weight of calcined lime.In contrast to the known procedures, the new method according to the invention provides cement as by-product instead of a useless slag.
摘要:
A process for reducing the inclusion content of steels and refining their structure which comprises the steps of subjecting molten steel containing inclusions to a pressure of at least 1 atm; removing inclusions from the molten steel by introducing therein at said pressure an inclusion-removing alloy containing calcium or magnesium; and thereafter applying vacuum to the molten steel to evaporate residual calcium or magnesium from the steel.