作者:Lei Zhang、Weijiang Zhang、Jiao Xu
DOI:10.14233/ajchem.2015.16895
日期:——
Because of the superior features of boron-10 isotope in absorbing hot neutrons, boric-10 acid (H3 10BO3) has been used widely in nuclear industry, like as additive in primary loop of pressurized water reactor and as control rod and other shielded materials in nuclear reactor. Boric-10 acid is obtained from boron-10 trifluoride (10BF3) by esterification and hydrolyzation. In this study, the preparation of trimethyl borate-10 [(CH3O)3B] from boron-10 trifluoride (10BF3) obtained through chemical exchange rectification was investigated. The kinetics of esterification reaction was controlled by second order pseudo homogeneous reaction. The activation energy was 685.5 KJ/mol. In addition, the hydrolyzation of trimethyl borate-10 was investigated as a function of pH, temperature and molar ratio of water to trimethyl borate-10. Under optimum process conditions, higher yield of boric-10 acid with nuclear industrial purity grade was realized.
由于硼-10 同位素在吸收热中子方面的优越特性,硼-10 酸(H3 10BO3)已被广泛应用于核工业,如压水堆一回路的添加剂和核反应堆中的控制棒及其他屏蔽材料。硼-10 酸是由三氟化硼(10BF3)通过酯化和水解反应得到的。本研究以化学交换整流法获得的三氟化硼(10BF3)为原料,研究了三甲基硼酸-10 [(CH3O)3B]的制备方法。酯化反应动力学受二阶伪均相反应控制。活化能为 685.5 KJ/mol。此外,还研究了三甲基硼酸-10 的水解与 pH 值、温度和水与三甲基硼酸-10 的摩尔比的函数关系。在最佳工艺条件下,获得了更高产率的核工业纯度级硼-10 酸。