Process for the recovery and recycling of materials that constitute supported palladium membranes
AssigneeHydrogen Onsite, S.L.
InventorsDavid Alfredo Pacheco Tanaka, Margot Anabell Llosa Tanco, Ekain Fernández, Jon Melendez, Alba Arratibel
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Abstract
A process for recycling and reusing supported Pd membranes includes the separation of the Pd (or Pd alloy) layer from the support by contacting the Pd membrane with hydrogen under pressure and at low temperature and then with a second gas that is different from hydrogen. The Pd layer separated from the support can then be treated to solubilize the Pd and, where appropriate, the alloy metal(s) to obtain salts that can be reused, for example in the preparation of new Pd membranes. The recovered supports are also reusable.
Claims12
A process for recycling and reusing a supported Pd membrane, said supported Pd membrane comprising a Pd layer and a support, the process comprising the following steps:
- i) introducing supported Pd membrane in a container,
- ii) pressurizing the container with a gas comprising at least 1% v/v of hydrogen at a hydrogen partial pressure equal to or greater than 1 kPa and at a temperature equal to or higher than 30° C. and equal to or lower than 80° C.,
- iii) depressurizing the container,
- iv) removing the hydrogen from the container by purging the reactor to remove said hydrogen while replacing said hydrogen by an inert gas,
- v) opening the container to remove the supported Pd membrane,
- vi) spontaneous delamination of the Pd layer from the support,
- vii) separating the Pd contained in the delaminated Pd layer by contacting said delaminated Pd layer in a reaction medium comprising at least one solubilizer and at least one oxidant of Pd, and
- viii) recovering the Pd in form of a Pd salt and the support for reuse.
Dependencies are inferred from the claim text.