Propylene Oxide (250)
Propylene oxide 877 PROPYLENE OXIDE (250) First draft was prepared by Dr Dugald MacLachlan, Australian Quarantine and Inspection Service, Canberra, Australia EXPLANATION Propylene oxide is used in agriculture as an insecticidal fumigant and sterilant, to control bacteria contamination, mould contamination, insect infestations, and microbial spoilage of food products as well as to control insects in non-food products. Propylene oxide is also a commercially important industrial chemical finding application as an intermediate for a wide array of products. At the Forty- second Session of the CCPR (2010), it was scheduled for the evaluation as a new compound by 2011 JMPR. Residue studies were submitted by the manufacturers to support the following commodities: cereal grains (maize and wheat), tree nuts, cocoa, herbs and spices and dried fruit (raisins, figs and prunes). IDENTITY Common name Propylene oxide Chemical name IUPAC: Methyloxirane CAS: Methyloxirane Manufacturer's code numbers: Propylene oxide CAS number: 75–56–9 Molecular formula: C3H6O Molecular mass: 58.08 g/mol Structural formula: O CH 3 Synonyms: 1,2-propylene oxide, epoxypropane, 1,2-epoxypropane, 2,3- epoxyropane, propene oxide, propylene epoxide, methylethylene oxide, methyloxacyclopropane, PPO. Propylene oxide exists in two optical isomers, and commercial propylene oxide is a racemic mixture. Formulations Active ingredient content Fumigant 99.9% propylene oxide Physical and chemical properties Property Results Reference Appearance Colourless liquid IPCS, 1988; IARC, 1994; ECB, 2002 Odour Ethereal IPCS, 1988; ECB, 2002 878 Propylene oxide Property Results Reference Melting point -112.16 °C (-112.1 °C to -112.6 °C) IARC, 1994; ECB, 2002 Boiling point 33.9 °C–34.3 °C IARC, 1994; ECB, 2002 Relative density 0.83 g/L IARC, 1994; ECB, 2002 Vapour pressure 59.8 kPa (58.4 kPa–61.2 kPa) ECB, 2002 Solubility in water 395–405 g/L (pH = 7) Warren, 1988; IARC, 1994; ECB, 2002 Solubility in organic solvents Miscible with acetone, benzene, carbon (at 20 °C) tetrachloride, diethyl ether and methanol.
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