Process for hydrate inhibitor regeneration

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/52 (2006.01) F17D 1/05 (2006.01) F17D 3/14 (2006.01) C09K 15/06 (2006.01)

Patent

CA 2750602

The invention provides a process for the production of a lean liquid hydrate inhibitor composition from a rich liquid hydrate inhibitor composition in which the liquid hydrate inhibitor has a boiling point above that of water, which process comprises: (a) feeding said rich liquid hydrate inhibitor composition to a first distillation vessel; (b) withdrawing a water and inhibitor containing vapour from said first distillation vessel and feeding it to a second distillation vessel; (c) withdrawing water vapour from said second distillation vessel; (d) withdrawing a lean hydrate inhibitor composition from said second distillation vessel in liquid form; (e) withdrawing a lean hydrate inhibitor composition from said first distillation vessel in liquid form; (f) withdrawing liquid from said first distillation vessel and removing solids therefrom; wherein the withdrawal of steps (e) and (f) may be of a single liquid stream and wherein at least a portion of the lean hydrate inhibitor composition withdrawn from said first distillation vessel is not recycled into said first distillation vessel.

La présente invention concerne un procédé destiné à la production d'une composition d'inhibiteur d'hydrate liquide pauvre à partir d'une composition d'inhibiteur d'hydrate liquide riche. L'inhibiteur d'hydrate liquide présente un point d'ébullition supérieur à celui de l'eau. Ledit procédé comprend les étapes suivantes : (a) introduire ladite composition d'inhibiteur d'hydrate liquide riche dans un premier récipient de distillation; (b) retirer une vapeur contenant de l'eau et un inhibiteur dudit premier récipient de distillation et l'introduire dans un second récipient de distillation; (c) retirer la vapeur d'eau dudit second récipient de distillation; (d) retirer une composition d'inhibiteur d'hydrate liquide pauvre du second récipient de distillation sous forme liquide; (e) retirer une composition d'inhibiteur d'hydrate liquide pauvre dudit premier récipient de distillation sous forme liquide; (f) retirer le liquide dudit premier récipient de distillation et retirer des solides de celui-ci. Le retrait des étapes (e) et (f) peut être d'un premier flux liquide, et au moins une partie de la composition d'inhibiteur d'hydrate liquide pauvre dudit premier récipient de distillation n'est pas recyclée dans ledit premier récipient de distillation.

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