Toxicity oxidized oils

Castor Oil, Oxidized, Heating of castor oils in intimate contact with air or oxygen at temps of 80 to 130°, with or wo a catalyst, produce oils of high viscosity and higher d, than untreated castor oils. The oxidized oils, known also as "blown oils are used as plasticizers in lacquers, artificial leathers, oil cloths and similar products (Ref 5,p 241). It was claimed by Nakamura (AddnlRef d) that a small quantity of peroxide was formed when castor oil was treated with air at ca 155°. Mondain-Monval Marteau(Addnl Ref e) claimed that direct oxidation of castor oil (as well as of some other vegetable oils) by air in a heated glass tube also produced peroxides Refs l)Daniel(1902), 472 2)Thorpe 2(1938), 420-22 3)CondChemDict(1942), 288(Cheddites) 4)Davis( 1943), 258, 269, 358-60 365 5)Kirk Othmer 3(1949), 237-44 6)Izzo, Pirotecnia(1950), 226-7 239 7)Kirk Othmer 11(1953), 323 8) Sax(1957), 444(Toxicity fire hazard of castor oil) 9)CondChemDict(1961), 229 10)US... 

Lloyd. C,.J. (1961), The effect of piperonyl hu(oxide oil the toxicity of pyrdhrills to the cigarette beetle. Pyre tit. Post 6. 3 4. 

The amount of asphaltenes determines toxicity (aromatic oils are substantially more toxic than naphthenic and paraffinic). Presence of asphaltenes determines potential use in different polymeric materials. In addition to these characteristics, concentration of impurities such as sulfur and nitrogen are important because they affect oxidation and U V degradation. Very pure paraffinic oils are the most stable compounds. 

Raw material input to petroleum refineries is primarily crude oil however, petroleum refineries use and generate an enormous number of chemicals, many of which leave the facilities as discharges of air emissions, wastewater, or solid waste. Pollutants generated typically include VOCs, carbon monoxide (CO), sulfur oxides (SOJ, nitrogen oxides (NOJ, particulates, ammonia (NH3), hydrogen sulfide (HjS) metals, spent acids, and numerous toxic organic compounds. 

Natural gas will continue to be substituted for oil and coal as primary energy source in order to reduce emissions of noxious combustion products particulates (soot), unburned hydrocarbons, dioxins, sulfur and nitrogen oxides (sources of acid rain and snow), and toxic carbon monoxide, as well as carbon dioxide, which is believed to be the chief greenhouse gas responsible for global warming. Policy implemented to curtail carbon emissions based on the perceived threat could dramatically accelerate the switch to natural gas. 

The stability of tin over the middle pH range (approximately 3-5-9), its solubility in acids or alkalis (modified by the high hydrogen overpotential), and the formation of complex ions are the basis of its general corrosion behaviour. Other properties which have influenced the selection of tin for particular purposes are the non-toxicity of tin salts and the absence of catalytic promotion of oxidation processes that may cause changes in oils or other neutral media affecting their quality or producing corrosive acids. 

Oils. Among many investigated oils, soy oil, middle-chain triglycerides (MCT), safflower oil, and cottonseed oils are favoured for use as the oil phase due to their low incidence of toxic reactions. Purity is regarded as an important criterion for parenteral use. Undesirable contaminants such as hydrogenated oil, saturated fatty materials, pigments, or oxidative decomposition products should be minimized. 

Sources 1 D.H. Bennett, C.M. Falter and A.F. Campbell, Prediction of Effluent Characteristics, Use of Lime Treatments and Toxicity of the Proposed Ponderay Mill , Appendix in engineer s report on Effluent Characteristics for Washington State Department of Ecology, 1987. 2 D.F. Zinkel, Tall Oil Precursors of Loblolly Pine , Tappi, 1975, 58, 2, pp. 118-121. 3 R.W. Hemingway, P.J. Nelson and W.E. Hillis, Rapid Oxidation of the Fats and Resins in Pinus Radiata Chips for Pitch Control , Tappi, 1971, 54, 1, pp. 95-98. 4 D.O. Foster, D.F. Zinkel and A.H. Conner, Tall Oil Precursors of Douglas Fir , Tappi, 1980, 63, 12, pp. 103-105. 

Dewaxing (Figure 4.17) processes also produce heater stack gas (carbon monoxide, sulfur oxides, nitrogen oxides, and particulate matter) as well as hydrocarbon emission such as fugitive propane and fugitive solvents. Steam stripping wastewater (oil and solvents) and solvent recovery wastewater (oil and propane) are also produced. The fugitive solvent emissions may be toxic (toluene, methyl ethyl ketone, methyl isobutyl ketone). 

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