高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (8): 1109.

• 论文 • 上一篇    下一篇

乙醇-丙烯酸体系中乙醇的γ辐解研究

魏根栓, 吴季兰, 卢晓红, 哈鸿飞, 周玉荣   

  1. 北京大学技术物理系, 北京 100871
  • 收稿日期:1991-07-27 出版日期:1992-08-24 发布日期:1992-08-24
  • 通讯作者: 魏根栓

Studies on the Radiolysis of Ethanol in γ-Irradiated Acrylic Acid-Ethanol System

WEI Gen-Shuan, WU Ji-Lan, LU Xiao-Hong, HA Hong-Fei, ZHOU Yu-Rong   

  1. Department of Technical Physics, Peking University, Beijing, 100871
  • Received:1991-07-27 Online:1992-08-24 Published:1992-08-24

摘要: 研究了乙醇-丙烯酸体系在低剂量下的γ辐解产物H2、2,3-丁二醇及乙醛的生成.结果表明,乙醛不是在α-羟乙基自由基的歧化反应中生成的,而是来源于刺迹中的快反应;在该体系中丙烯酸(未与溶剂化电子反应)可清除H原子,其反应速率常数k4=7.5×109mol-1s-1;2,3-丁二醇由α-羟乙基自由基的再结合反应生成,动力学方程可表示为:G=G0—[k11/2(k10)1/2](G/K'D)1/2[AAH].

关键词: 乙醇, 丙烯酸, &gamma, -辐解

Abstract: The G-values of main radiolytic products of ethanoi in the γ-irradiated acrylic acid-ethanol system were measured under lower absorbed dose.The results reveal that acetaldehyde mainly comes from the primary processes of the radiolysis of ethanoi but not from the dispropor-ticnation reaction of CH3CHOH;2,3-butanediol can be formed by recombinationn of CH3CHOHand its kinetic equation can be described as the following formula:G=G0—[k11/2(k10)1/2](G/K'D)1/2[AAH] k11(1.8×105 mol-1·s-1) can be obtained.Acrylic acid can scavenge Hand CH3CHOH in the system,which leads to the decrease of GH2 and G(CH3CHOH)2 Using competation reaction kinetics,we can get k4/k2=4.4×102

Key words: Ethanol, Acrylic acid, γ-Radiolysis

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