Preparation method of diluent for spent fuel aftertreatment
A technology of diluent and spent fuel, which is applied in the field of preparation of diluent for spent fuel reprocessing, can solve the problems of high technical difficulty, long process and poor catalyst selectivity, and achieves reduced technical difficulty, strong compatibility and good performance. Effect
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[0018] The preparation method of the diluent for spent fuel post-processing according to the embodiment of the present invention includes the following steps: under the action of a catalyst, triisobutene is selectively hydrogenated to produce hydrogenated triisobutene; adding compound components to the hydrogenated triisobutene and mixing The diluent is prepared by the reaction; wherein the catalyst is a supported metal catalyst, the active component is at least one of Pt, Pd, Ni, Ag, Au, Ir, Fe, and the carrier is activated carbon, ZSM series molecular sieve, SAPO series molecular sieve , Mordenite, Y zeolite, β zeolite, Al 2 O 3 , TiO 2 , One of amorphous aluminum silicate; the compound component is poly-α-olefin or F-T synthetic oil.
[0019] Specifically, the preparation method of the diluent can be carried out according to the following steps:
[0020] (1) Hydrogenation reaction: Add the raw material triisobutene into the reactor, and add a certain amount of catalyst, then eva...
Embodiment 1
[0031] Hydrogenation of triisobutene: In a 1L reactor, add 150g of raw material triisobutene, and add 5g of Pd / SAPO-11 catalyst together; then evacuate, fill with nitrogen, and repeat pumping and venting for more than three times; the last time is evacuated and passed in Hydrogen; adjust the pressure of the reactor to 2MPa and the temperature to 190℃ to react for 15h, then take samples and use the fluorescent indicator adsorption method to detect the conversion rate of raw materials.
[0032] The reaction solution obtained from the above reaction was filtered with a short silica gel column (silica gel diameter 30mm, height 10cm), and then washed with 30mL n-hexane. The filtrate was combined and concentrated to obtain hydrogenated triisobutene; the physical and chemical properties of the hydrogenated product were measured as: The bromine value is 0.29 g / 100g and the density is 0.71g / cm 3 (20℃), dynamic viscosity is 1.3cP (20℃), flash point is 60℃.
Embodiment 2
[0034] Hydrogenation of triisobutene: In a 1L reactor, add 150g of raw material triisobutene, and add 5g of Pd / mordenite together; then evacuate, fill with nitrogen, and repeat pumping and ventilating more than three times; evacuating for the last time and introducing hydrogen; Adjust the pressure of the reactor to 2MPa and the temperature to 190°C to react for 15h, and then take samples and use the fluorescent indicator adsorption method to detect the conversion rate of raw materials.
[0035] The reaction solution obtained from the above reaction was filtered with a short silica gel column (silica gel diameter 30mm, height 10cm), and then washed with 30mL n-hexane. The filtrate was combined and concentrated to obtain hydrogenated triisobutene; the physical and chemical properties of the hydrogenated product were measured as: The bromine value is 0.31 g / 100g and the density is 0.71g / cm 3 (20℃), dynamic viscosity is 1.2cP (20℃), flash point is 59℃.
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