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Adsorbent for separating palladium from alkali metals and alkaline-earth metals and its preparation method and use

An alkaline earth metal and adsorbent technology, applied in the field of adsorbent for separating element palladium and its preparation, can solve the problems of high acidity, high radioactivity, high toxicity, etc., and achieves high separation speed, good selectivity, and reduced complexity. Effect

Inactive Publication Date: 2013-06-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The high-level waste liquid (HLLW) produced by the reprocessing of spent fuel is a highly acidic, highly radioactive and highly toxic mixed solution. During the separation process of the exothermic element Cs and the exothermic element Sr, the alkali metal and alkaline earth metal solution Generally may contain NaNO 3 、KNO 3 , RbNO 3 , CsNO 3 , Sr(NO 3 ) 2 , Ba(NO 3 ) 2 And a certain amount of palladium, there is no effective method in the prior art to effectively separate the palladium in the solution

Method used

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  • Adsorbent for separating palladium from alkali metals and alkaline-earth metals and its preparation method and use
  • Adsorbent for separating palladium from alkali metals and alkaline-earth metals and its preparation method and use
  • Adsorbent for separating palladium from alkali metals and alkaline-earth metals and its preparation method and use

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Experimental program
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Effect test

Embodiment 1

[0036] Preparation of 4-[3-(3-benzo-15-crown-5)methyl-4-hydroxy-phenyl]methylethyl-phenol resin

[0037] Add 3.42g (15mmol) 2,2-bis(4-hydroxyphenyl) propane and 3.49g (13mmol) benzo-15-crown 5 to 30g trichloroacetic acid, stir and dissolve at 90°C to form a solution, then Add 1.79g of paraformaldehyde (containing 60mmol formaldehyde) into the solution within 4.5 hours. After the addition is completed, the reaction temperature is raised to 140°C. After 4 hours of reaction, precipitation begins to appear in the reaction system, and the mass to be precipitated no longer increases. Cool the reaction system to room temperature, add 150mL of methanol to the resulting reaction solution to atomize the precipitate, crush and filter to obtain a solid powder, continue to wash the solid powder with 50mL of methanol, and repeat the washing several times until the cleaning solution (i.e. methanol ) without color change, finally obtained brown powder, which is 4-[3-(3-benzo-15-crown-5)methyl-4...

Embodiment 2

[0040] The preparation of embodiment 2 adsorbents

[0041] 100 grams of 4-[3-(3-benzo-15-crown-5)methyl-4-hydroxyl-phenyl]methylethyl-phenol resin (n is 7) with structural formula (I) was dissolved in In 1000mL of dichloromethane, mix evenly; add 150g of porous silica gel, stir evenly to volatilize most of the dichloromethane until the material is in a nearly dry state, and then dry the nearly dry material in vacuum at 45°C for 24h.

Embodiment 3

[0042] The preparation of embodiment 3 adsorbent

[0043] 100 grams of 4-[3-(3-benzo-15-crown-5)methyl-4-hydroxyl-phenyl]methylethyl-phenol resin (n is 9) with structural formula (I) was dissolved in In 1000mL of dichloromethane, mix well; add 200g of porous silica gel, stir evenly to volatilize most of the dichloromethane until the material is in a nearly dry state, and then dry the nearly dry material in vacuum at 45°C for 24h.

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Abstract

The invention discloses an adsorbent for separating palladium from alkali metals and alkaline-earth metals. 4-[3-(3-benzo-15-crown-5)methyl-4-hydroxy-phenyl]methylethyl-phenolic resin is supported by carriers to form the adsorbent. The 4-[3-(3-benzo-15-crown-5)methyl-4-hydroxy-phenyl]methylethyl-phenolic resin has a structural general formula (I), wherein in the structural general formula (I), n is an integer of 7-15. The carriers are porous silica gel or large-hole SiO2 coated by a polymer. The invention also discloses a preparation method and a use of the adsorbent for separating palladium from alkali metals and alkaline-earth metals. The preparation method has simple processes. The adsorbent obtained by the preparation method has good selectivity in palladium separation. The palladium separation process adopting the adsorbent is simple. The adsorbent has high separation efficiency and can be industrially produced easily.

Description

technical field [0001] The invention relates to the technical field of separation of elemental palladium, in particular to an adsorbent for separating elemental palladium from alkali metals and alkaline earth metals, a preparation method and application thereof. Background technique [0002] Elemental palladium is a silver-white transition metal with soft texture, good ductility and plasticity, and can be forged, rolled and drawn. [0003] The chemical properties of elemental palladium are inactive, and it is stable in air and humid environment at room temperature. When heated to 800°C, a palladium oxide film forms on the surface of palladium. Elemental palladium can resist the erosion of hydrofluoric acid, phosphoric acid, perchloric acid, hydrochloric acid and sulfuric acid vapor, but it is easily soluble in aqua regia and hot concentrated sulfuric acid and concentrated nitric acid. Both are corrosive. [0004] Block metal palladium can absorb a large amount of hydrogen....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C22B7/00C22B11/00
CPCY02P10/20
Inventor 张安运戴荧
Owner ZHEJIANG UNIV
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