Molybdenum soluble compounds

Chromium- and molybdenum-based catalysts yield predominantly 1,2-poly-butadiene. Several soluble chromium compounds such as Cr(Acac)3 give apparently hydrocarbon-soluble catalysts when activated with AIR3. Also, soluble catalysts are formed from soluble molybdenum compounds such as Mo(Acac)3 or Mo02(Acac)2 on reaction with AlEt3 in the presence of ethyl acetate or sulphides. ESR studies of Mo(OR)xCl4 x-based catalysts showed the Mo(III) species to be present in the catalysts. It should be mentioned, however, that catalysts based on group 6 metals have not been extensively studied [7],... 

M-coke A homogeneous desulfurization process that uses an oil-soluble molybdenum compound as the catalyst. 

Figure 3.1 Reduction in Fuel Consumption with an Oil Containing an Oil-Soluble Molybdenum Compound (Ref.52)...

Considerable doubt and controversy exist about the mechanism of action of a number of other molybdenum compounds or mixtures in lubrication, and in particular about whether their action involves in situ formation of molybdenum disulphide. Braithwaite has stated that one of the reasons for the development of soluble molybdenum compounds was that it "was thought by some (erroneously) that Organo-molybdenum sulphur compounds would decompose to M0S2 which would then provide lubrication." Nevertheless Braithwaite goes on to refer to several other authors, such as Feng et al , Isoyama and Sakurai , and Yamamoto et al , all of whom maintain that they have shown the formation of molybdenum disulphide from organo-molybdenum sulphur compounds. Similar results have been reported by... 

Detailed investigations of the mechanism of action of these oil-soluble molybdenum compounds have not yet been performed, but there is some evidence to suggest that the mechanism is similar to that of molybdenum disulphide. 

Jin and Zhou found that molybdenum disulphide was formed by a different approach which did not depend on the use of a soluble molybdenum compound. They were studying the performance of a mixed ether/ester oil containing 3% of a zinc dialkyidithiophosphate at 450°C, in contact with a molybdenum alloy. They found that an in situ film of graphite and molybdenum disulphide was formed, and the... 

The effect of operating conditions in the formation of these in situ films is likely to be complex. In 1972 Forbes showed that even under fairly mild conditions with an anti-wear additive such as tricresyl phosphate surface films are formed which contain both phosphorus and organic fragments. Similarly Cann showed that a cross-linked thick surface film is formed from zinc dialkyidithiophosphate under mild rubbing conditions. It seems probable that at least some of the soluble molybdenum compounds would also experience partial breakdown under mild rubbing conditions, and that these would encourage the formation of protective surface films. 

Water-soluble molybdenum compounds are readily taken up through the lungs and the gastrointestinal... 

Water-insoluble molybdenite (M0S2) is practically nontoxic rats dosed with up to 500 mg molybdenite daily for 44 days exhibited no adverse effects. In contrast, animals dosed subchronically with water-soluble molybdenum compounds exhibited gastrointestinal disturbances, growth retardation, anemia. 

Occupational exposure limits for soluble molybdenum compounds are prescribed at 5mgm- (ACGIA 1986, MAK 1987). For insoluble compounds, the maximum allowances are 5mgm (ACGIA 1986) and 15 mgm (MAK 1987), respectively. 

ACUTE HEALTH RISKS (Molybdenum and insoluble molybdenum compounds) irritation of eyes, nose and throat, weight loss, listlessness, diarrhea, and digestive disturbances in animals symptoms of acute poisoning, based upon animal experiments, include coma, deaths from heart failure, liver and kidney damage. (Soluble molybdenum compounds (irritation of eyes, nose, and throat, loss of appetite, incoordination, dyspnea, anemia, and colic in animals. 

CHRONIC HEALTH RISKS (Molybdenum and insoluble molybdenum and insoluble compounds) based upon animal experiments, accumulation of molybdenum dust in the lungs, spleen, and heart, showed a decrease of DNA and RNA in the kidneys, spleen, and liver exposure to molybdenum dust from alloys or carbides caused "hard-metal lung disease" in humans. (Soluble molybdenum compounds) repeated exposure to soluble molybdenum compounds, based on animals data, suggests an association with the gout can cause anemia in animals exposure to molybdenum trioxide (M0O3), over a period of 3-7 years, has caused pneumoconiosis in workers. 

DISPOSAL AND STORAGE METHODS Molybdenum and insoluble or soluble molybdenum compounds may be disposed of in a secured, sanitary landfill storage should be in sealed containers in a cool, dry location separate soluble molybdenum compounds from alkali metals (e.g., sodium, potassium, or molten magnesium) molybdenum and insoluble molybdenum compounds should be kept away from strong oxidizers. 

Synonyms/Trade Names Synonyms vary depending upon the specific soluble molybdenum compound. ... 

Properties vary depending upon the specific soluble molybdenum compound. 

In 1962, researchers at Scientific Design discovered a direct oxidation reaction for making propylene oxide, which was then made by a variant of the chlorhydrin process. The new process involved the air oxidation of isobutene to -butylhydroperoxide, which in turn is used to oxidize propylene in the presence of a soluble molybdenum compound. The coproduct is f-butanol. To develop this process, Scientific Design reorganized to form Halcon International, a joint venture with Atlantic Richfield called Oxirane. The first plants were built in 1969... 

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