The oxirane value is the percentage of oxygen absorbed by an unsaturated feedstock during epoxidation (during an oxygen atom transfer reaction), or a measure of the amount of epoxidized double bonds in a material. Both the oxirane value and the iodine value are used in the evaluation of epoxy plasticizers. A high oxirane value and a low iodine value are considered essential for good performance, but they are not the only criteria.
The highest theoretical oxirane oxygen content was determined as 6,4 percent. The experimentally determined oxirane oxygen content in 100 grams of oil should be 5,8 percent. Thus, the percent relative conversion from oxirane to oxygen is 90,6 percent.
Epoxides are also known as oxiranes, and the most important and simplest epoxide is ethylene oxide, which is prepared on an industrial scale by the catalytic oxidation of ethylene with air. Ethylene oxide or oxirane is a colorless, poisonous and flammable gas with a faintly sweet odour. Ethylene oxide is used as an important chemical raw material in the production of ethylene glycol, which is used as antifreeze, liquid coolant and solvent. On the other hand, ethylene glycol and polyethylene terephthalate (PET), the raw material of plastic bottles, are used in polyester production.
Although oxirane functions readily react with a wide variety of chemical reagents, there is no single universally successful analytical method applied to measure the oxirane content of all epoxides.
The key difference between oxirane and epoxy groups is that oxirane is a less reactive chemical compound whereas an epoxy group is a functional group that is relatively more reactive.
The term oxirane is used by the International Union of Fundamental and Applied Chemistry (IUPAC) to describe the ethylene oxide compound. The glycidyl group and the epoxy group are functional oxirane groups recognized as derivatives of ethylene oxide or oxirane.
Briefly, oxirane or ethylene oxide is an organic compound. This compound is in the structure classified as an ether and is the simplest epoxide compound. The oxirane structure is a three-membered carbon ring containing an oxygen atom along with two carbon atoms. Here, each carbon atom is bonded to two hydrogen atoms.
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