Diluent and hydrogenation preparation method thereof, and composition

The invention belongs to the technical field of radioactive waste treatment, and relates to a diluent and a hydrogenation preparation method thereof, and a composition. The method comprises the following steps: (1) by taking isoolefin and hydrogen as raw materials, carrying out a reaction under the action of a catalyst to generate saturated chain hydrocarbon; and (2) rectifying the generated saturated chain hydrocarbon through a rectifying tower to separate a middle fraction so as to obtain the diluent. By utilizing the method for preparing the diluent through hydrogenation, the diluent can beprepared under mild operation conditions through a simple process, and the prepared composition of the diluent and tributyl phosphate has higher saturated loading capacity and shorter phase splittingtime when being used for spent fuel extraction. 本发明属于放射性废物处理技术领域，涉及一种稀释剂及其加氢制备的方法与组合物。所述的方法包括如下步骤：(1)以异构烯烃和氢气为原料，在催化剂作用下反应生成饱和链烃；(2)将生成的饱和链烃经精馏塔精馏分离出中间馏分，即得到稀释剂。利用本发明的加氢制备稀释剂的方法，能够操作条件温和、工艺简单的制备稀释剂，制得的稀释剂与磷酸三丁酯的组合物在用于乏燃料萃取时，具