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Method for recycling ruthenium in supported type ruthenium catalyst

A technology of metal catalyst and ruthenium catalyst, which is applied in the recovery field of precious metal catalysts, can solve the problems of high energy consumption and complicated recovery process, and achieve the effect of simplifying the recovery process, reducing costs and reducing steps

Active Publication Date: 2011-06-29
KAILUAN ENERGY CHEM
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  • Abstract
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Problems solved by technology

[0010] Although the above-mentioned ruthenium metal catalyst recovery method can effectively recover ruthenium metal, the recovery process is complicated and the energy consumption is high

Method used

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  • Method for recycling ruthenium in supported type ruthenium catalyst

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Embodiment 1～10

[0034] Examples 1-10: Put 20 g of supported catalysts that do not contain or have removed alkali metals or alkaline earth metals in a closed container, pass through a nitrogen flow to replace the residual gas in the container, heat to T1 ° C, roast for 1.5 hours, and stop nitrogen Flow in, continue to heat up to T2°C, roast for 5 hours, pass in nitrogen gas and slowly cool down to get a black solid, grind the black solid to powder, put it in a closed container, heat up to T3°C, and introduce a pressure of P from the bottom of the container. Mpa ozone oxidation is a black solid in a fluidized state, and the ruthenium tetroxide produced by oxidation is introduced into a dilute hydrochloric acid solution with a concentration of M, and the ruthenium tetroxide gas is absorbed and reduced to a reddish-brown ruthenium trichloride hydrochloric acid solution. The obtained solution was distilled under reduced pressure, and the crystallization was β-RuCl3 xH2O (containing 37.6% ruthenium)...

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Abstract

The invention discloses a method for recycling ruthenium in a supported type ruthenium or ruthenium oxide catalyst. The method comprises the following technological steps: (1) placing a supported type ruthenium catalyst or a supported type ruthenium oxide catalyst in an airtight container, heating to 300-500 DEG C, and roasting for 1-2 hours; and feeding nitrogen for protection during roasting process; (2) stopping the feeding of nitrogen stream in the step (1), continuing to heat to 800-1000 DEG C, and roasting for 2-10 hours; and obtaining black solids after cooling; (3) grinding black solids into powder, placing in the airtight container, and heating to 100-300 DEG C; and feeding oxygen / ozone to oxidize solid powder and generate ruthenium tetroxide gas; and (4) feeding the ruthenium tetroxide gas into diluted hydrochloric acid, and restoring the acid combined with the gas into a red and brown ruthenium trichloride solution. According to the device, the step of recycling the catalyst is reduced; not only is the cost reduced during the recycling process of ruthenium catalyst, but also the recycling process is simplified; and economic benefit and the environment benefit are greatly improved.

Description

technical field [0001] The invention relates to a method for recovering a noble metal catalyst, in particular to a method for recovering ruthenium from a loaded ruthenium metal catalyst. Background technique [0002] In recent years, ruthenium catalysts have been widely used in many fields such as hydrogenation, oxidation, hydrogenolysis, and ammonia synthesis due to their good catalytic performance, high activity, good stability, and reduced reaction energy consumption. my country's ruthenium resources are scarce, and most of them depend on imports, resulting in high catalyst costs. Therefore, the development of recycling methods for waste catalysts is a prerequisite for its use in industrial production. [0003] The supported ruthenium metal catalyst is mostly used in the field of partial hydrogenation of benzene to cyclohexene. Since 1990, Japan's Asahi Kasei Corporation used ruthenium-based catalysts for the partial hydrogenation of benzene to cyclohexene. In 2005, my c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 房承宣王亚涛于泳李建华严加才彭胜
Owner KAILUAN ENERGY CHEM
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