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    Electrolytic furnaces having multiple cells formed of horizontal bipolar carbon electrodes
    42.
    发明授权
    Electrolytic furnaces having multiple cells formed of horizontal bipolar carbon electrodes 失效
    具有形成水平双极碳电极的多个电池的电解炉

    公开(公告)号：US3554893A

    公开(公告)日：1971-01-12

    申请号：US3554893D

    申请日：1966-10-17

    Applicant: VARDA GIUSEPPE DE ,  MONTEDISON SPA

    Inventor： VARDA GIUSEPPE DE

    IPC: C25C3/08 ,  C22D3/02 ,  B01K3/04

    CPC classification number: C25C3/08

    Abstract: DESCRIBED IS A FUSED BATH ELETROYLSIS FURNACE FOR PRODUCING METALS, OF HIGHER SPECIFIC GRAVITY THAN THE BATH, FROM THEIR OXIDES. THE FURNACE COMPRISES A VAT WITH A CATHODIC BOTTOM, A CARBON ANODE ADAPTED TO BE LIFTED AND LOWERED RELATIVE TO SAID BOTTOM, AND AT LEAST ONE HORIZONTAL BIPOLAR CARBON ELECTRODE BETWEEN SAID ANODE AND

    CATHODE IN VERTICALLY SPACED RELATION THERETO AND HAVING A CATHODIC TOP FACE FOR ACCUMULTING METAL PRODUCED. ALSO DESCRIBED IS THE PRODUCTION OF ALUMINUM FROM ALUMINA IN A BATH CONTAINING FLUORINE SALTS IN SUCH FURNACES.

    Process obtaining sulfurous gases and magnetite or iron sponge from waste ferrous sulfate
    43.
    发明授权
    Process obtaining sulfurous gases and magnetite or iron sponge from waste ferrous sulfate 失效
    从废弃硫酸盐获得硫磺气体和磁铁或海绵的工艺

    公开(公告)号：US3554733A

    公开(公告)日：1971-01-12

    申请号：US3554733D

    申请日：1967-06-29

    Applicant: MONTEDISON SPA

    Inventor： COLOMBO UMBERTO ,  SIRONI GIUSEPPE

    IPC: C01G49/06 ,  C07C29/141 ,  C07C29/145 ,  C07C29/16 ,  C07C29/17 ,  C07F15/06 ,  C01G49/08

    CPC classification number: C07F15/065 ,  C01G49/06 ,  C01P2006/80 ,  C07C29/141 ,  C07C29/145 ,  C07C29/16 ,  C07C29/175 ,  Y02P20/129 ,  Y10S423/02

    Abstract: A PROCESS FOR OBTAINING CONCENTRATED SULFUROUS GASES AND MAGNETITE OR IRON SPONGE WITH HIGH IRON CONTENT, WHICH ARE VALUBLE PRODUCTS FOR THE IRON-METALLURGIC IN DUSTRY, FROM HEPTAHYDRATE FERROUS SULFATE. THE PROCESS IS BROADLY CHARACTERIZED BY THE FOLLOWING SEQUENCE; (A) DEHYDRATION OF THE HEPTAHYDRATE FERROUS SULFATE TO THE MONOHYDRATE FORM; (B) THERMAL DECOMPOSITION OF THE MONOHYDRATE FERROUS SULFATE IN A FLUIDIZED BED; (C) REDUCTION OF THE HOT HERMATITIC ASHES IN A FLUIDIZED BED OR IN A ROTARY FURNACE, TO MAGNETITE OR TO SPONGE IRON; (D) MAGNETIC CONCENTRATION OF THE PRODUCT OBTAINED IN (C) WITH CONSEQUENT ELIMNATION OF THE IMPURITIES UNDESIRABLE IN IRON METALLURGY AND OBTAINMENT OF A CONCENTRATE OF HIGH FE GRADE; (E) PREHEATING OF THE AIR NECESSARY FOR OPERATIONS (A), (B) AND (C) BY MEANS OF HEAT EXCHANGE WITH THE HOT SULFUROUS GASES PRODUCED IN (B); AND (F) UTILIZATION OF THE SENSIBLE AND CHEMICAL HEAT OF THE GASES LEAVING THE REDUCTION (C) FOR THE THERMAL DECOMPOSITON OF THE MONOHYDRATE FERROUS SULFATE AND/OR FOR THE DEHYDRATION OF THE HEPTAHYDRATE FERROUS SULFATE TO THE MONOHYDRATE FORM.

    Process for preparing primary alkanols from 4,4-dialkyl-metadioxanes
    45.
    发明授权
    Process for preparing primary alkanols from 4,4-dialkyl-metadioxanes 失效
    从4,4-DIALKYL-METADIOXES制备主要烷基醇的方法

    公开(公告)号：US3541161A

    公开(公告)日：1970-11-17

    申请号：US72111968

    申请日：1968-04-12

    Applicant: MONTEDISON SPA

    Inventor： PREGAGLIA GIANFRANCO ,  GUGLIELMO GREGORIO

    IPC: C07C29/10 ,  C07C31/02

    CPC classification number: C07C29/103 ,  C07C31/125

    Abstract: Monohydric alcohols, containing one carbon atom less than the parent metadioxane, are made by hydrogenolysis of 4,4-dialkyl metadioxanes, having a methyl or an ethyl group as one alkyl substituent and a C1 to C5 alkyl group as the other, with molecular hydrogen, in which a catalyst of Raney nickel, preferably 0.1 to 20% by weight, and zinc chloride, preferably 0.1 to 5% by weight of the metadioxane is used. A C1 to C4 alkanol is employed advantageously as solvent and preferred reaction conditions include 20 to 200 atmos. hydrogen pressure and 120 DEG to 220 DEG C. The starting material is made by condensation under mineral acid conditions of an olefine with aqueous formaldehyde. In the examples, 4 - methyl - 4 - propyl metadioxane, prepared from 2-methyl-1-pentene and aqueous formaldehyde, yields on hydrogenolysis, in methanol, 3-methyl hexanol.

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