| 摘要 |
1. A process for the removal of heavy metals from organic compounds characterised in that a solution of the organic compound in a solvent immiscible with water is treated with a cysteine derivative of formula wherein R is a hydrogen atom, a linear or branched C1-C6 acyl group or a benzoyl group. 2. A process according to Claim 1 wherein the molar amount of cysteine derivative and heavy metal is from 1:1 to 100:1. 3. A process according to Claim 2 wherein the molar ratio is between 5:1 and 15:1. 4. A process according to Claim 1 wherein N-acetylcysteine is used as cysteine derivative. 5. A process according to Claim 1 wherein an aqueous solution of the cysteine derivative is used. 6. A process according to Claim 5 wherein the concentration of the aqueous solution is between 5% and 70% w/w. 7. A process according to Claim 1 wherein the solvent is selected among toluene, xylene, methylene chloride, chlorobenzene, 1,2-dichlorobenzene and aliphatic hydrocarbons optionally in admixture with aprotic dipolar solvents. 8. A process according to Claim 1 further comprising the treatment with a basic aqueous solution. 9. A process according to Claim 8 wherein the basic aqueous solution is an ammonia aqueous solution. 10. A process for the removal of heavy metals from organic compounds characterised in that a solution of the organic compound in a solvent immiscible with water is first treated with an aqueous solution of N-acetylcysteine and then with an ammonia aqueous solution. 11. A process according to Claim 10 is used for removal of palladium. |
