Abstract: Provided herein are methods for inhibiting the formation of scale on equipment in contact with a produced fluid containing a scale-forming divalent cation. Such methods can comprise adding an activated alginate to the produced fluid in an amount effective to react with the divalent cation in the produced fluid to form an activated alginate complex; and separating the activated alginate complex from the produced fluid. Methods can further comprise recycling the activated alginate from the activated alginate complex by dissolving the activated alginate complex. The activated alginate can be prepared by thermally modifying an alginate precursor at a temperature of from 80° C. to 180° C. for a period of at least 24 hours. The activated alginate can be in the form of a solution including 0.1% to 10% by weight activated alginate, based on the total weight of the solution.

Abstract: A system and method for recovery of hydrate inhibitor from a fluid comprising hydrate inhibitor, water, mineral salt ions and salt particles is disclosed. Wherein, the system comprises: —an indirectly heated paddle dryer with a fluid inlet, at least one vapor outlet and a dry salt outlet —a vapor separation unit in fluid communication with the at least one vapor outlet for separation of the vapor to recover the hydrate inhibitor.

Abstract: A system and method for recovery of hydrate inhibitor from a fluid comprising hydrate inhibitor, water, mineral salt ions and salt particles is disclosed. Wherein, the system comprises: -an indirectly heated paddle dryer with a fluid inlet, at least one vapor outlet and a dry salt outlet -a vapor separation unit in fluid communication with the at least one vapor outlet for separation of the vapor to recover the hydrate inhibitor.