フタル酸エステル類の熱分解に関する研究(第1報) : Bis(2-ethylhexyl)Phthalateの熱分解反応

概要

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The typical plasticizer, bis (2-ethylhexyl) phthalate was decomposed to examine its thermal behavior. The reaction was carried out in a flow-system apparatus under atmospheric pressure, and in a stepwise temperatures of below 400°, in the range of 400-475°, and above 475°. The reaction began at nearly 250°, and the maximum yield of decomposition products was obtained at 475°. 2-Ethylhexyl benzoate (monoester) was obtained from the products and this was considered to be the intermediate in this decomposition reaction. This monoester was found to be formed by the direct fission of one of the sidechains in the benzene ring. The decomposition product consisted of 6% of 2-ethylhex-1-ene, 3% of 2-ethylhexanol, and 5% of phthalic anhydride, under the condition of the residence time of 12 sec and at 400°. There was no difference in the ratio of the decomposition products when the reaction was carried out at below 400°. It was considered that a cyclic concerted mechanism was evident at 400°or below and a radical mechanism at above 400°.
公益社団法人日本薬学会の論文
1977-05-25