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Study on cleaing solvents using activated alumina in PUREX process

PUREXプロセスへの活性アルミナを用いた溶媒洗浄技術の検討

荒井 陽一; 荻野 英樹; 竹内 正行; 加瀬 健; 中島 靖雄

Arai, Yoichi; Ogino, Hideki; Takeuchi, Masayuki; Kase, Takeshi; Nakajima, Yasuo

本研究では、活性アルミナを用いた溶媒洗浄法について調査した。劣化させた30%TBP/$$n$$-ドデカンのサンプルは$$gamma$$線照射(1.6MGy)により調製した。劣化物はガスクロマトグラフ質量分析により定性分析を実施した。このサンプルを活性アルミナと接触させ、3M HNO$$_{3}$$との相分離試験によって溶媒劣化物の除去による洗浄効果について検討した。相分離試験は、分液ロート内に両相を加えて振とうし、分散相が界面から消失することにより行った。分析の結果、劣化物としてヘキサン,長鎖アルコール類等が生成することを確認し、また、活性アルミナとの接触により、TBP/$$n$$-ドデカンの劣化物の約70%が除去され、相分離特性が改善することを確認した。

Solvent cleanup method using activated alumina was discussed in this study. This method was one of candidate to remove TBP/$$n$$-dodecane degradation products. The degradation sample of 30% TBP/$$n$$-dodecane was prepared by irradiation (1.6 MGy) using $$^{60}$$Co $$gamma$$-source. The absorbed dose for sample was almost 1.6 MGy. The degradation products were qualitatively analyzed by gas chromatography-mass spectrometer (GC-MS). After the irradiation, solvent cleanup was performed by activated alumina and the cleanup using alumina was examined by phase separation test with 3M HNO$$_{3}$$. As the result, it was found that hexane and long-chain alcohols were mainly generated as the n-dodecane degradation products by irradiation, and almost 70% of the TBP/$$n$$-dodecane degradation products were removed and the phase separation performance were improved by the cleanup using activated alumina.

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