Preparation method of diluent for spent fuel aftertreatment

The invention provides a preparation method of diluent for spent fuel aftertreatment, and belongs to the technical field of nuclear fuel circulation. The preparation method comprises the following steps: with isobutene as raw materials, the selective hydrogenation is performed under the catalyst effect to generate hydrogenated isobutene; then, compound components are fed in the hydrogenated isobutene for mixing to obtain branched paraffin mixture diluent; the catalyst is a loaded metal catalyst; and the compound components are poly alpha-olefin or F-T synthesized oil. The preparation method has such advantages as simple operation, short flow, low cost and low technical difficulty; and through introduction of second components for adjusting compositions and performances of hydrogenated products, new thoughts are provided to such application scenes as high-discharge waste liquid treatment. 本发明提供了一种乏燃料后处理用稀释剂的制备方法，属于核燃料循环技术领域，该制备方法为：以三异丁烯为原料，在催化剂作用下进行选择加氢生成氢化三异丁烯；然后在氢化三异丁烯中加入复配组分，混合搅拌得支链烷烃混合物稀释剂；其中，催化剂为负载型金属催化剂；