Additives to enhance metal and amine removal in refinery...

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 17/04 (2006.01) C10G 31/08 (2006.01) C10G 33/02 (2006.01) C10G 33/04 (2006.01)

Patent

CA 2495087

It has been discovered that metals and/or amines can be removed or transferred from a hydrocarbon phase to a water phase in an emulsion breaking process by using a composition that contains water-soluble hydroxyacids. Suitable water- soluble hydroxyacids include, but are not necessarily limited to glycolic acid, gluconic acid, C2-C4 alpha-hydroxy acids, poly-hydroxy carboxylic acids, thioglycolic acid, chloroacetic acid, polymeric forms of the above hydroxyacids, poly-glycolic esters, glycolate ethers, and ammonium salt and alkali metal salts of these hydroxyacids, and mixtures thereof. The composition may also include at least one mineral acid to reduce the pH of the desalter wash water. A solvent may be optionally included in the composition. The invention permits transfer of metals and/or amines into the aqueous phase with little or no hydrocarbon phase undercarry into the aqueous phase. The composition is particularly useful in treating crude oil emulsions, and in removing calcium and other metals therefrom.

On a découvert que des métaux et/ou des amines pouvaient être éliminés ou transférés d'une phase hydrocarbonée dans une phase aqueuse dans un processus de désémulsion, au moyen d'une composition contenant des hydroxyacides hydrosolubles. On mentionne, comme hydroxyacides hydrosolubles appropriés, toutefois sans caractère limitatif, les produits suivants : acide glycolique, acide gluconique, hydroxyacides alpha en C¿2? C¿4?, acides polyhydroxycarboxyliques, acide thioglycolique, acide chloroacétique, formes polymères des hydroxyacides précités, esters polyglycoliques, éthers de glycolate, ainsi que sels d'ammonium et sels de métaux alcalins de ces hydroxyacides, et des mélanges de ces produits. La composition peut également comprendre au moins un acide minéral pour réduire le pH de l'eau de lavage du désalinateur. Un solvant peut être éventuellement ajouté dans la composition. L'invention permet le transfert de métaux et/ou d'amines dans la phase aqueuse, sans aucune phase hydrocarbonée, ou très peu de celle-ci, entraînée dans la phase aqueuse. La composition est utilisée en particulier dans le traitement d'émulsions d'huiles brutes et dans l'élimination du calcium et d'autres métaux à partir de ces émulsions.

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