CAS: 1308-38-9; Dichromium Trioxide

专利信息

专利号:US-4279781-A
优先权日:1979-10-09
标 题:Catalyst for the synthesis of methanol
发明人：DIENES EDWARD K; COLEMAN RAY L; HAUSBERGER ARTHUR L
权利人:UNITED CATALYSTS INC
摘要:A methanol synthesis catalyst which comprises a major portion by weight of the oxides of copper and zinc and a minor portion by weight of a thermal stabilizing metal oxide is useful for the synthesis of methanol from the oxides of carbon and hydrogen at relatively low temperatures. The catalyst is characterized in that the ratio of copper oxide to zinc oxide, each expressed as a metal by weight, is in the range of from 2:1 to 3.5:1 and by the intimate association with each other of copper and zinc oxides and with said thermal stabilizing oxide. Further, the catalyst is characterized in that the amount of iron oxides, as an impurity, is less than 150 parts per million.

专利号:US-11059849-B2
优先权日:2014-09-02
标题 :Modified nucleotides for synthesis of nucleic acids, a kit containing such nucleotides and their use for the production of synthetic nucleic acid sequences or genes
发明人：YBERT THOMAS; GARIEL SYLVAIN
权利人:DNA SCRIPT
摘要:A modified nucleotide, intended for the synthesis of long chain nucleic acids by enzymatic processes, comprising a “naturalâ€? nitrogenous base or a natural nitrogenous base analogue, a ribose or deoxyribose carbohydrate, and at least one phosphate group, characterized in that said nucleotide comprises at least one R group, termed the modifier group, carried by said nitrogenous base or analogue and/or by the oxygen in position 3′ of the ribose or deoxyribose molecule, making it possible to block the polymerization of said nucleotide and/or to allow the interaction of said nucleotide with another molecule, such as a protein, during the nucleic acid synthesis, R comprising at least one functional terminal group.

专利号:US-2025129495-A1
优先权日:2021-09-24
标 题:Method for the electrochemical synthesis of ammonia and apparatus for carrying out the method
发明人：FINKELSHTAIN GENNADI; BORCHTCHOUKOVA NINO; SHIROKOV ALEXANDER V; ENGLANDER JOSEPH ALEXANDER; SHARABI RONIT; ZABILSKIY MAXIM; TSAI TSEPIN
权利人:GENCELL LTD
摘要:A method for the electrochemical synthesis of ammonia (NH 3 ) comprises contacting a nitrogen-containing gas with the cathode of an electrochemical cell comprising a cathode, an anode, an alkaline aqueous electrolyte, and preferably an anion exchange membrane. The cathode is a porous gas diffusion electrode which comprises an active layer comprising a material which is capable of catalyzing the electrochemical reduction of nitrogen and is in contact with the electrolyte, a layer of electroconductive material supporting the active layer, and a porous polymer film on the side of the active layer which does not come into contact with the electrolyte and comes into direct contact with the nitrogen-containing gas. A potential over the electrochemical cell is applied to effect the electrochemical synthesis of ammonia from nitrogen and water. The method can be used to synthesize ammonia without using molecular hydrogen.

专利号:US-9079818-B2
优先权日:2007-10-15
标 题 :Process for synthesis of fluorinated olefins
发明人：MUKHOPADHYAY SUDIP; BORTZ CHERYL L; LIGHT BARBARA A; CANTLON CHERYL L; JOHNSON ROBERT C
权利人:MUKHOPADHYAY SUDIP; BORTZ CHERYL L; LIGHT BARBARA A; CANTLON CHERYL L; JOHNSON ROBERT C; HONEYWELL INT INC
摘要:Disclosed is a process for the synthesis of fluorinated olefins, and in particularly preferred embodiments tetrafluorinated olefins having F on an unsaturated, non-terminal carbon, such as 2,3,3,3-tetrafluoropropene. The preferred processes of the present invention in accordance with one embodiment generally comprise:n (a) reacting a compound of formula (I)n nX 1 X 2   (I)n nwith a compound of formula (II)n nCX 1 X 2 X 3 CX 1 â•?CX 1 X 2   (II)n nto produce a reaction product comprising a compound of formula (III)n nCF 3 CHX 1 CH 2 X 2   (III), andn (b) exposing said compound of formula (III) to reaction conditions effective to convert said compound of formula (III) to a compound of formula (IV)n nCF 3 CZâ•?CH 2   (IV)n nwherein X 1 , X 2 , and X 3 are each independently selected from the group consisting of hydrogen, chlorine, bromine, fluorine and iodine, provided that X 1 and X 2 in formula (I) are not both hydrogen and Z is Cl, I, Br, or F

专利号:WO-2008062139-A1
优先权日:2006-11-24
标题 :Method for the synthesis of light aldehyde by the catalytic oxidation of the corresponding alcohol in a reactor made of specific materials
发明人：DUBOIS JEAN-LUC; DUPONT NICOLAS; FERRER FREDERIC; VAN VEEN ANDRE; MIRODATOS CLAUDE
权利人:ARKEMA FRANCE; DUBOIS JEAN-LUC; DUPONT NICOLAS; FERRER FREDERIC; VAN VEEN ANDRE; MIRODATOS CLAUDE
摘要:The present invention relates to a method for the synthesis of light aldehyde by the gaseous-phase oxy-dehydrogenation of the corresponding alcohol at a temperature of between 500 and 700°C in adiabatic conditions and in the presence of a metal silver catalyst, characterised in that the oxy-dehydrogenation reaction is carried out in a reactor made of a metal or metal alloy capable of forming a surface layer of chemically inert oxides in nominal operating conditions. More particularly, the metal is selected from titanium, zirconium and tantalum. The metallic alloys include at least 19 wt % or chromium and at least one alloy element selected from aluminium, silicon, manganese, magnesium, wherein the total concentration of said metals is higher than 2 wt %, or selected from the rare earths comprising lanthanum, yttrium, or cerium with a concentration of between 0.1 and 0.5 %

专利号:US-4360504-A
优先权日:1980-11-03
标 题 :Simultaneous destruction of trace components in the reaction off-gas from the synthesis of melamine
发明人：BLANCK KLAUS; DETHLEFSEN WINFRIED; JUNGBAUER ANTON; LEUTNER BERND; SCHIER ERNST-JUERGEN; SCHLIMPER HANS-ULRICH; SCHNEEHAGE HANS H
权利人:BASF AG
摘要:The reaction off-gas from the synthesis of melamine consists, after separating off the melamine, mainly of ammonia and carbon dioxide, with traces of hydrogen cyanide, isocyanic acid, urea and residual melamine. To remove these trace components, the off-gas is passed over a catalyst, containing copper oxide and/or iron oxide, in the presence of steam at from 100° to 500° C.