Patent ID: 9090813
Filing Date: 2015-07-28
Classification: C07C,C09K

Abstract:
1. A process for the production of a lean liquid hydrate inhibitor composition and a reusable salty lean hydrate inhibitor composition from a rich liquid hydrate inhibitor composition in which the liquid hydrate inhibitor has a boiling point above that of water, the process comprising: (a) feeding said rich liquid hydrate inhibitor composition to a first distillation vessel; (b) withdrawing a water and inhibitor containing vapor from said first distillation vessel and feeding it to a second distillation vessel; (c) withdrawing water vapor from said second distillation vessel; (d) withdrawing said lean hydrate inhibitor composition which is free of non-volatile impurities from said second distillation vessel in liquid form; (e) withdrawing said salty lean hydrate inhibitor composition from said first distillation vessel in liquid form; and (f) withdrawing liquid from said first distillation vessel and removing solids therefrom; wherein the withdrawal of (e) and (f) may be of a single liquid stream and wherein the entire salty stream withdrawn from the first distillation vessel in step (e) is not recycled into said first distillation vessel.