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

Active Publication Date: 2019-12-17
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, isoparaffin mixtures have disadvantages such as complex components, difficulty in synthesis and separation, technical secrecy, and difficulty in purchasing them from the market.
At present, isoparaffin mixtures are mainly prepared through processes such as propylene oligomerization, fraction cutting, and hydrogenation. This preparation method has disadvantages such as poor catalyst selectivity, low yield, long process, high process operation cost, and high technical difficulty.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[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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Abstract

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.

Description

Technical field [0001] The invention belongs to the technical field of nuclear fuel cycle, and specifically relates to a preparation method of a diluent for post-processing of spent fuel. Background technique [0002] The Purex process (Prex process) is currently the most widely used process in the reprocessing of spent fuel. This process uses solvent extraction to extract uranium and plutonium from the spent fuel dissolved liquid. Among them, the most commonly used extraction system is a mixture of tributyl phosphate (TBP) and a diluent, where the diluent can reduce the density and viscosity of the solvent phase, improve the hydrodynamic performance of the system, adjust the extraction capacity and selectivity of TBP, and Prevent nuclear criticality risks and other functions. Therefore, the choice of diluent has an important influence on the extraction performance of Purex process. At present, the diluents used in the spent fuel reprocessing process mainly include normal paraf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/40C22B60/02C22B60/04G21C19/42
CPCC22B7/006C22B60/026C22B60/04C22B3/402G21C19/42Y02E30/30Y02P10/20
Inventor 王文涛苏哲何辉袁洁琼曹智谢书宝
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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