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Journal Archive

Platinum Metals Rev., 1957, 1, (4), 144

NEW PATENTS: October 1957

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Preparation of Pregnane Derivatives


organon laboratories ltd. British Patent 774,082

A platinum or palladium catalyst is used in a process for preparing pregnane derivatives from 11- dehydrosarmentogenin.

Preparing Derivatives of Etiocholanic Acid


n. v. organon. British Patent 774,083

A platinum or palladium hydrogenation catalyst is used in the preparation of derivatives of etiocholanic acid by oxidation of pregnane compounds.

Liquid Phase Dehydrohalogenation Process


dominion tar & chemical co. ltd. British Patent 774,125

Organic halogen-containing compounds of specified general formula are dehydrohalogenated by maintaining the bulk of the compound in the molten state in a receptacle and contacting part of the compound with a hot surface which is immersed in the molten compound; the surface is maintained at a temperature of 600-1200°C, preferably 800-1100°C. The hot surface consists of an electrically conductive material, such as platinum.

Sliding Contacts


henschel & sohn g.m.b.h. British Patent 774,159

Contact members composed of, or coated with, platinum are used in an arrangement of sliding contacts which remain closed for single pole generators and employing a short path contact conducting fluid path, e.g. mercury.

New Unsaturated Esters, Ethers and Aldehydes


f. hoffmann-la roche & co. a.g. British Patent 774,462

A palladium-lead catalyst may be used as a hydrogenation catalyst in the preparation of the novel compounds.

Catalysts


rohm & haas g.m.b.h. British Patent 775,401

A platinum catalyst for use in reactions between a gaseous hydrocarbon and another gas or gases is composed of a gauze of platinum or platinum alloy, the marginal edges of the gauze, which, during the reaction, are at a lower temperature than the reaction temperature, being embedded in a completely gas-tight manner in a refractory material, e.g. aluminium oxide, zinc oxide or magnesium oxide. In this way, the deposition of carbon on the gauge, leading to corrosion and destruction of the catalyst is avoided.

Catalytic Fume Incinerator


h. r. suter et al. British Patent 775,549

A catalytic fume incinerator comprises a pair of parallelly arranged metallic screens with a filling wire contacting the screens at numerous points. The metallic wire is formed of a core of a nickel-chromium or a nickel-chromium-iron alloy, coated with amorphous platinum, palladium, osmium, rhodium or iridium or mixtures thereof. Either of the screens may be formed of similar wire.

Catalytic Elements


h. r. suter et al. British Patent 775,550

Discloses the manufacture of the catalyst of No. 775,549 supra. A base of a nickel-chromium, nickel-chromium-iron alloy or other high temperature resistant alloy is coated with a deposit of one or more of the platinum group metals and the whole is heated to 600°F in an air stream containing volatile hydrocarbons to condition the coating and increase the strength of the bond.

Production of Substituted 1,2 Diphenyl-3,5-Dioxo-Pyrazolidines


j. r. geigy a.g. British Patent 775,925

A palladium-on-charcoal catalyst is used in a process for the preparation of the above compounds.

Hydrogenative Reforming of Gasoline


houdry process corp. British Patent 775,961 A multi-stage process of upgrading naphthas or gasoline catalytically at reforming temperatures and super-atmospheric pressure is effected in an initial stage in the presence of a platinum-on-silica catalyst and in a subsequent stage in the presence of a platinum-on-alumina catalyst and a minor amount of gaseous halogen or gaseous halide compound mixed with the stream of hydrogen and the naphtha. The combination of alumina carrier and halogen or halide compound renders this stage more favourable for isomerisation reactions.

Forming or Restoring a Platinum-Type Catalyst


houdry process corp. British Patent 775,962

A catalyst consisting of a platinum group metal compound supported on alumina is treated with a reducing gas to reduce the compound to metallic form with a minor amount of vapour of a halogen or halide included in the reducing gas to control the amount of chemically bound halide in the alumina during reduction at the equilibrium value.

Reforming of Gasoline or other Naphtha Fractions


houdry process corp. British Patent 775,963

Reforming operations carried out in the presence of hydrogen-rich recycle gas and supported platinum catalysts, e.g. platinum-on-alumina containing a minor amount of chloride are enhanced by supplying C8-C5 aliphatic hydrocarbons as part of the feed.

Hydrogen Peroxide


laporte chemicals ltd. British Patent 776,991

In the manufacture of hydrogen peroxide by the successive reduction and oxidation of an organic compound, the latter is reduced in the presence of a palladium catalyst comprising palladium supported on a siliceous carrier on which an insoluble magnesium compound has first been deposited.

Hydrocarbon Reforming


standard oil co. British Patent 777,459

Discloses a naphtha hydroforming process and apparatus in which a preheated mixture of a naphtha and recycled hydrogen is contacted with a first platinum catalyst at hydroforming temperature and a pressure of 100-350 p.s.i.g., the stream reheated and contacted with a second platinum catalyst at higher temperature and lower pressure and then the effluent stream from this stage is reheated and contacted with a third platinum catalyst at still higher temperature and slightly lower pressure.

Catalysts


esso research & engineering co. British Patent 777,770

A platinum group metal catalyst of high activity is made by contacting a dilute aqueous slurry of alumina (concentration 5–25 wt %) with a dilute aqueous solution of a water-soluble compound of a platinum group metal, e.g. chloroplatinic acid in the presence of an adsorption modifier, e.g. chloroacetic acid, separating the impregnated alumina, drying and contacting it with chlorine at 600–1000°F at a chlorine partial pressure of 0.001–1 atms.

Purifying of Caprolactam


stamicarbon n.v. British Patent 778,751

Caprolactam is purified by treatment with hydrogen in the presence of a platinum or palladium hydrogenation catalyst. Hydrogen is passed through an aqueous solution of the caprolactam at a temperature below the boiling point thereof.

Platinum- or Palladium-containing Catalyst


the atlantic refining co. et al. British Patent 779,497

In preparing a hydrocarbon reforming catalyst, a cracking component—silica, and one or more of alumina, zirconia, magnesia and thoria—is contacted with an aqueous solution of a reducible compound of platinum or palladium. The cracking component has a catalytic activity of 10–50 (theoretical maximum 100). The precious metal compound is deposited in amount equal to 0.1–2.5% of the metal by weight of catalyst and contact with the cracking component is maintained for 3–288 hours under non-evaporative conditions at elevated temperature up to boiling point. The treated component is then dried and the compound reduced to the metal. The platinum or palladium deposited on the base is stated not to be removable by water washing before reduction.

Alumina


esso research & engineering co. British Patent 779,771

A hydroforming catalyst is made by impregnating an adsorptive alumina with catalyst material, e.g. palladium or platinum, and then calcining the alumina at a temperature of 1100–1500°F and rapidly chilling to at least room temperature; chilling time not over 50 seconds.

Regeneration of Hydroforming Catalysts


esso research & engineering co. British Patent 780,528

A platinum-on-alumina hydroforming catalyst contaminated with carbonaceous and sulphurous deposits is regenerated by oxidising the deposits at elevated temperatures with an oxygen-containing gas such that the gaseous products contain some, but less than 1% by volume of free oxygen.

Protecting Tube for Thermo-elements of the Platinum Group


august thyssen-hutte a.g. German Patent 959,857

The ceramic protecting tube for platinum metal thermoelements, or at least that part subjected to the high temperature of the furnace and furnace gases, has added to it one or more platinum group metals in finely divided form and/or in the form of a surface coating.

Manufacture of Platinum Group Metal Catalysts


n.v. de bataafsche petroleum maatschappij German Patent 960,894

In the manufacture of a catalyst composed of a platinum group metal supported on silica and/or alumina containing acid carrier in which the neutralised acid carrier is contacted with a solution of a platinum group metal compound at a pH above 3, and the product dried, the medium used for neutralising the carrier is removed from the dried product.

Electrical Contacts


Dr. A. Keil et al. German Patent 961,762

Claims the use of an alloy of 0.1–25% (preferably 5–15%) lead and remainder palladium as material for electrical contacts.

Electrical Contacts


w. c. heraeus g.m.b.h. German Patent 965,603

A contact material consists of 82–95% preferably 83–88%) palladium, 0.5–5% aluminium, titanium, zirconium, thorium, vanadium, niobium and/or tantalum and remainder of at least 5% copper.

Catalysts


houdry process corp. U.S. Patent 2,785,138

Supported platinum group metal catalysts are stabilised against rapid deactivation in use by treatment in a stream of reducing gas before use. The reducing gas is composed of hydrogen containing up to 1% by volume of chloride vapour, expressed as hydrogen chloride.

Process for a Formylation of a 5 - Nitro - souracil


the new york quinine & chemical works inc. U.S. Patent 2,785,163

A supported platinum group metal catalyst is used in the reductive formylation of a 5-nitro-souracil derivative of specified formula.

Electric Discharge Lamp


general electric co. U.S. Patent 2,785,327

An electric discharge lamp consists of a vitreous envelope on the inner face of which is a reflecting coating composed of an inner layer of rhodium on which is a phosphor coating which is excitable to light emission by radiation from ultra-violet generating means within the envelope and contains material chemically inert to rhodium.

Tetradehydro Reserpic Acid and Esters Thereof


ciba pharmaceutical products inc. U.S. Patent 2,786,843

Palladium black and a platinum catalyst are used in the preparation of tetradehydro compounds.

Metal Film Resistor


sprague electric co. U.S. Patent 2,786,925

A metal film resistor is composed of an electrically resistive film of a metal alloy on a vitreous base, fired on silver layers connected to the base and forming terminals and narrow bands of platinum or palladium connecting the silver layers with the resistive film in order to counteract any tendency for the silver layers to diffuse into the resistance film.

Contact Materials


the north electric co. U.S. Patent 2,787,688

An electrical contact member includes the combination of a current conducting base and a solid state alloy surface composed mainly of palladium and zinc.

Electrodes for Electron Discharge Tubes


international telephone and telegraph corp. U.S. Patent 2,788,460

A non-emissive electrode is formed of a core of tantalum, molybdenum, zirconium, columbium, tungsten or hafnium or alloys thereof, an emission-inhibiting homogeneous coating on this core composed of carbon bonded with one or more platinum group metals and an intermediate barrier layer to prevent interaction between the coating and the core.

Electrical Contact Devices


siemens & halske a.g. U.S. Patent 2,789,187

A contact piece of low electric resistance for frequent switching operation under heavy current loading is composed of a carrier on which is a surface layer contact face formed of a sintered composition comprising 20–70% gold and 80–30% iridium or rhodium.

Hydrogen Altimeter


bendix aviation corp. U.S. Patent 2,790,324

An altimeter includes a hydrogen pressure responsive device having an evacuated envelope into the interior of which communicates an insert made of a platinum group metal. The insert is heated to allow the flow of hydrogen through it into and out of the envelope so as to vary the hydrogen pressure within the envelope as a function of altitude.

Fluidised Hydrocarbon Conversion Process


the m.w. kellogg co. U.S. Patent 2,791,542

Light hydrocarbon oils are reformed by means of a fluidised platinum catalyst by a novel method which avoids substantial loss of catalyst due to entrainment in the gaseous effluent streams of the processing zones. Method of stripping catalyst described.

Electrodes


n. de makay U.S. Patent 2,791,557

An electrode for electrolytic processes includes a glass tube through the walls of which extend, and to which are fused, a number of platinum wires. A platinum electrode is attached to the platinum wires externally of the tube and lead-in alloy conductors extend along the interior of the tube and contact a portion of each platinum wire.

Reforming of Gasoline


shell development co. U.S. Patent 2,792,337

A platinum catalyst is used in the hydroforming of a gasoline fraction in which the fraction is preheated in the presence of hydrogen to over 800°F and the preheated vapours are then passed via a ferruginous metal feed inlet line to a catalytic converter and through a bed of the catalyst therein.

Electrodeposition of Platinum


the international nickel co. inc. U.S. Patent 2,792,341

Thick smooth adherent deposits of platinum free from cracks are obtained by use of an aqueous acid chloride-chloroplatinate bath containing in solution 180–300 gm/litre of hydrogen chloride, 10–50 gm/litre of platinum and balance water.

Electrical Contact Elements


baker & co. inc. U.S. Patent 2,793,273

The positive contact of a pair of cooperating contacts consists of an alloy of 90–99% palladium and 1-10% ruthenium, while the negative contact consists of 90–99.5% silver and 0.5–10% palladium.

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