Processing aids for enhanced hydrocarbon recovery from oil...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 1/04 (2006.01) B03B 9/02 (2006.01)

Patent

CA 2535702

A method of improving hydrocarbon recovery from oil sands, oil shale, and petroleum residues includes adding a polymeric or nonpolymeric processing aid capable of sequestering cations, such as the multivalent calcium, magnesium and iron cations. The hydrocarbons are preferably contacted with the processing aid before a primary separation of the hydrocarbons in order to increase bitumen recovery. A processing aid is provided in an effective amount to increase the liberation of the hydrocarbons from inorganic solids, particularly when the source is a poor processing ore. Preferred processing aids include citric acid or a polymeric acid selected from polyacrylic acid, polymethacrylic acid, salts of these acids, partial salts of these acids, and combinations thereof. The processing aids significantly increase the hydrocarbon recovery typically with concentrations less than 50 ppm and the polymeric processing aids can also provide beneficial flocculation of solids in tailings slurry.

Cette invention concerne un procédé permettant d'améliorer l'extraction d'hydrocarbures à partir de sables bitumineux, de schistes bitumineux et autres résidus du pétrole. Ce procédé consiste à ajouter un auxiliaire de traitement polymère ou non polymère capable de capturer des cations tels que des cations multivalents de calcium, de magnésium ou de fer. Pour accroître la récupération du bitume, on met les hydrocarbures en contact avec l'auxiliaire de traitement de préférence avant la séparation primaire de ces derniers. L'auxiliaire de traitement est utilisé en quantité efficace afin d'augmenter la séparation des hydrocarbures des solides organiques, en particulier lorsque la source est constituée par un minerai à faible aptitude au traitement. Les auxiliaires de traitement préférés sont l'acide citrique ou un acide polymère pris parmi l'acide polyacrylique, l'acide polyméthacrylique, des sels de ces acides, des sels partiels de ces acides, seuls ou en combinaison. Les auxiliaires de traitement permettent d'augmenter sensiblement le taux de récupération d'hydrocarbures avec des concentrations généralement inférieures à 50 ppm et provoquent par ailleurs une floculation avantageuse des solides dans la suspension de queues.

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