Johnson-Matthey

The silver nitrite may be prepared as described in Section 11,50, 17. The product supplied by Johnson, Matthey and Co. Ltd., of Hatton Garden, London, E.C. 1, is satisfactory it. should be washed with absolute methyl or ethyl alcohol, followed by sodium-dried ether, and dried in an electrically-heated oven at 100 for 30 minutes (longer heating results in darkening on the surface) the substance should be kept in a vacuum desiccator until required. 

That supplied by Johnson. Matthey and Co. Ltd. gives satisfactory results. 

Rhodium Ca.ta.lysts. Rhodium carbonyl catalysts for olefin hydroformylation are more active than cobalt carbonyls and can be appHed at lower temperatures and pressures (14). Rhodium hydrocarbonyl [75506-18-2] HRh(CO)4, results in lower -butyraldehyde [123-72-8] to isobutyraldehyde [78-84-2] ratios from propylene [115-07-17, C H, than does cobalt hydrocarbonyl, ie, 50/50 vs 80/20. Ligand-modified rhodium catalysts, HRh(CO)2L2 or HRh(CO)L2, afford /iso-ratios as high as 92/8 the ligand is generally a tertiary phosphine. The rhodium catalyst process was developed joindy by Union Carbide Chemicals, Johnson-Matthey, and Davy Powergas and has been Hcensed to several companies. It is particulady suited to propylene conversion to -butyraldehyde for 2-ethylhexanol production in that by-product isobutyraldehyde is minimized. 

CoF is available from Advance Research Chemicals, Inc., Aldrich Chemicals, Aesar, Johnson/Matthey, PCR, Pfaltz Bauer, Noah Chemicals, and Strem Chemicals of the United States, Fluorochem of the UK, and Schuhardt of Germany. Demand for cobalt trifluoride varies from 100 to 1500 kg/yr and the 1993 price for smaller quantities ranged from 300 to 350/kg. 

In spite of the many appHcations for copper(II) fluoride, demand is restricted to 1 to 10 kg lots. It is available ia the United States from Advance Research Chemicals, Aldrich Chemicals, Atomergic, Aesar, Johnson/Matthey, Cerac Corp., and PCR Corp. The 1993 price for the anhydrous copper(II) fluoride varied from 400 to 600/kg depending on the amount required. The dihydrate is available at 22/kg. 

The only reported industrial appHcation for Fep2 is its use in mst removal solutions based on oxalic acid (6). The anhydrous salt is commercially available in 100 g to 5 kg lots from Advance Research Chemicals, Aldrich Chemicals, Cerac, Johnson/Matthey, PCR, and other suppHers in the United States. As of 1993, the prices varied between 500 to 700/kg. 

High purity lead difluoride is available from Advance Research Chemicals, Aldrich Chemicals, Johnson/Matthey, Atomergic, Cerac, and other supphers ia the United States. The U.S. annual consumption varies between 500 to 2500 kg/yr. The 1993 price varied between 10—20/kg. 

This material is produced on pilot-plant scale and the U.S. annual consumption is less than 50 kg/yr. As of 1993, the price was 1500/kg. It is available from Advance Research Chemicals Inc., Aldrich Chemicals, Atomergic, Cerac, Johnson/Matthey, Pfalt2 Bauer, and Strem Chemicals. 

Uses. Silver fluoride has found many laboratory and special industrial appHcations. It is used as a soft (nHld) fluorinating agent for selective fluorination (7—17), as a cathode material in batteries (qv) (18), and as an antimicrobial agent (19). Silver fluoride is commercially available from Advance Research Chemicals, Inc., Aldrich Chemicals, Cerac Corp., Johnson/Matthey, PCR, Atochem, and other sources in the United States. The U.S. price of silver fluoride in 1993 was 1000— 1400/kg and the total U.S. consumption was less than 200 kg/yr. 

Johnson—Matthey/AESAR group, Aldrich Chemical, and EM Industries, Inc. Ultrahigh purity (99.999%) material is available only from Air Products and Chemicals, Inc. of Allentown, Peimsylvania. The price varies depending on the purity of the material from 25/kg (99%) through 250/kg (99.99%), to 1500—2500/kg (99.999%). Consumption of ZrF in the United States is less than 5000 kg/yr. 

Transparent iron oxides are produced by BASE (Germany), Johnson Matthey (U.K.), and Hilton Davis (U.S.). The mid-1990s aimual production is estimated to be around 2000 metric tons. 

Platinum series, Johnson Matthey, London, U.K., pubHshed annually siace 1985. 

References 1, 9, 10, and 12 are general references. Platinum Metals Peview published quarterly since 1957 by Johnson Matthey, London, U.K. Precious Metals conference proceedings, IPMI, Allentown, Pa. 

T/atinum 1985 Platinum 1990, and Platinum Johnson-Matthey PLC, London. 

Sodium Tetrahydroborate, Na[BH ]. This air-stable white powder, commonly referred to as sodium borohydride, is the most widely commercialized boron hydride material. It is used in a variety of industrial processes including bleaching of paper pulp and clays, preparation and purification of organic chemicals and pharmaceuticals, textile dye reduction, recovery of valuable metals, wastewater treatment, and production of dithionite compounds. Sodium borohydride is produced in the United States by Morton International, Inc., the Alfa Division of Johnson Matthey, Inc., and Covan Limited, with Morton International supplying about 75% of market. More than six million pounds of this material suppHed as powder, pellets, and aqueous solution, were produced in 1990. 

Strem Chemicals Pressure Chemical Co. Aldrich Chemical Co. Johnson Matthey (Aesar group) ... 

Johnson Matthey Inc., Wayne, PA 19087 formerly of FMC Corporation, Princeton, NJ 08540, which we acknowledge for partial support of this work. 

Air Products Chemicals Alfa Aesar GFS Chemicals Heico Chemicals Johnson Matthey (UK)... 

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