Procedure for the purification of sulphur

C - Chemistry – Metallurgy – 01 – B

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C01B 17/05 (2006.01) B01D 53/48 (2006.01) C01B 17/02 (2006.01)

Patent

CA 2366023

This is a description of a process for purifying sulphur that contains impurities. Solid sulphur (2) is placed in a contact zone (1) with at least one organic solvent (16) selected from among the group consisting of monoalcohols with 8 to 40 carbon atoms, polyols with 2 to 8 hyroxyl groups and 8 to 40 carbon atoms, polyalkylene glycols and polyalkylene glycol ethers in conditions appropriate for the fusion of sulphur. The flow of sulphur is stopped and the resulting mixture is allowed to settle so as to demix or separate the purified liquid sulphur from the liquid organic solvent containing the impurities. At least a part of the purified liquid sulphur is drawn off (8) from the lower part of the contact zone. The solvent can be used until it is saturated with dissolved and/or suspended products and no further liquid sulphur and solvent separation is possible. The solvent can be either regenerated and recycled or discarded. Application of purification process to sulphur obtained from a redox process.

On décrit un procédé de purification du soufre contenant des impuretés. On met en contact dans une zone (1) de mise en contact du soufre (2) solide avec au moins un solvant (16) organique choisi dans le groupe formé par les mono alcools de 8 à 40 atomes de carbone, les polyols comprenant 2 à 8 groupes hydroxyles et ayant de 8 à 40 atomes de carbone, les polyalkylèneglycols et les éthers de polyalkylèneglycols dans des conditions appropriées pour effectuer la fusion du soufre. On stoppe l'alimentation en soufre et on laisse décanter le mélange obtenu de façon à réaliser la démixtion ou la séparation liquide/liquide du soufre liquide purifié obtenu et du solvant organique contenant les impuretés. On soutire (8) une partie au moins du soufre liquide purifié de la partie inférieure de la zone de mise en contact. Le solvant peut être utilisé jusqu'à sa saturation en produits dissous et/ou en suspension ne permettant plus la séparation du soufre liquide et du solvant Il peut être soit régénéré et recyclé soit éliminé. Application du procédé à la purification du soufre obtenu dans un procédé ~ rédox ~.

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