Abstract: Method and system for removal of heavy metal ions from a rich hydrate inhibitor stream, wherein the method comprises a) adding a selective heavy metal reactant to the rich hydrate inhibitor stream, forming a fluid stream comprising heavy metal salt particles, b) separating the obtained fluid stream in three streams a hydrocarbon stream, a recovered rich hydrate inhibitor stream, and a slurry comprising the heavy metal salt particles, c) separating remaining hydrate inhibitor from the slurry thereby obtaining a concentrated rest comprising the heavy metal salt particles.

Abstract: A method and system for precipitation and separation of carboxylic acid salts from a hydrate inhibitor solution is disclosed. The method comprises lowering the solubility of the carboxylic acid salts to force precipitation of carboxylic acid salts and separation of the precipitated carboxylic acid salts from the hydrate inhibitor solution.

Abstract: A cyclone separator for separating a fluid into a gas phase and a liquid phase. The cyclone separator includes a vertically oriented vessel with a gas phase outlet at an upper end of the vessel and a liquid phase outlet at a lower end of the vessel; at least one tangentially oriented fluid inlet at the upper end below the gas phase outlet of the vessel; a liquid extractor extracting liquid through the liquid phase outlet at a rate which forms a bulk liquid phase at the lower end of the vessel; and a gas extractor extracting gas through the gas phase outlet. The cyclone separator has at least one flow velocity deflector located at a level in proximity to the bulk liquid-gas interphase which changes the vertical velocity component of a liquid film travelling down the internal wall of the vessel to a horizontally oriented velocity component.