Conoco Inc.

Regina A Severson

Alfred E Keller

Arthur L Cummings

Fred C Veatch

James C Thompsen

Aqueous alkanolamine solution containing iron sulfide particles is passed through a bed of contact materials having openings greater than the size of the iron sulfide particles and the iron sulfide particles adhere to the contact material. The contact material is regenerated to sequentially remove alkanolamine and iron sulfide particles by contacting it with water.

Removal of iron sulfide particles from alkanolamine solutions

Monitoring and controlling the reactivation of an alkanolamine solution containing heat-stable salts of such alkanolamine with stronger acid anions and weaker acid anions by contacting the alkanolamine solution (a) with a strong base anion exchange resin which has a high affinity for stronger acid anions (b) contacting the effluent alkanolamine solution from the strong base anion exchange resin with a second strong base anion exchange resin which has an affinity for weaker acid anions (c) measuring and recording the electrical conductance of the effluent solution from the first mentioned anion exchange resin (d) removing the first mentioned anion exchange resin from service when the conductance of the effluent alkanolamine solution from said resin indicates breakthrough of stronger acid anions in said effluent, (e) measuring and recording the electrical conductance of the effluent alkanolamine solution from the second mentioned anion exchange resin (f) removing the second mentioned anion exchange resin from service when the conductance of the effluent alkanolamine solution from said resin indicates break through of weaker acid anions in said effluent and (g) regenerating the strong base anion exchange resins.

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Houston, TX, United States of America

Regina A Severson