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US 11,427,478 B2Granted
Recycling of lead- and tin-based materials
AssigneeImperial College Innovations Limited
InventorsAleksandra Katarzyna Hekselman, David Payne, Yanying Wang, Andrew Ballantyne
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Abstract
This invention relates to a process for obtaining lead (Pb) and/or tin (Sn) from a lead- and/or tin-based material using a deep eutectic solvent.
Claims21
A method comprising:
- combining a lead- or tin-based material, or a mixture thereof, and a compound comprising a carboxylic acid moiety in the presence of a deep eutectic solvent;
- and
- precipitating lead or tin carboxylate;
- wherein the lead-based material comprises Pb, PbO, PbO2, PbSO4, PbCO3, (PbCO3)2.Pb(OH)2, PbTe, or APbX3, or a mixture thereof, wherein A is CH3NH3 or HC(NH2)2 and each X is independently I, Br or Cl;
- and
- wherein the tin-based material comprises ASnX3, wherein A is CH3NH3 or HC(NH2)2 and each X is independently I, Br or Cl.
3 more elements
A mixture comprising a lead- and/or tin-based material, a compound comprising a carboxylic acid moiety and a deep eutectic solvent, wherein the lead-based material comprises Pb, PbO, PbO2, PbSO4, PbCO3, (PbCO3)2.Pb(OH)2, PbTe, or APbX3, or a mixture thereof, wherein A is CH3NH3 or HC(NH2)2 and each X is independently I, Br or Cl;
- and wherein the tin-based material comprises ASnX3, wherein A is CH3NH3 or HC(NH2)2 and each X is independently I, Br or Cl, wherein the deep eutectic solvent is a natural deep eutectic solvent selected from the group consisting of choline chloride, choline bitartrate, betaine, lactic acid, DL-malic acid, citric acid, phytic acid sodium, D/L-proline, D-proline, L-proline, L-serine, L-glutamic salt, D-(+)-glucose, D-(−)-fructose, -alanine, malonic acid, maleic acid, aconitic acid, L-(+)-tartaric acid, glycol, 1,2-propanediol, glycerol, meso-erythritol, xylitol, adonitol, ribitol, D-sorbitol, D-xylose, A-L-rhamnose, sorbose, D-mannose, D-(+)-galactose, sucrose, D-(+)-trehalose, maltose, raffinose, proline, oxalic acid, lactose, inositol, and proline.
Dependencies are inferred from the claim text.