Process feed and effluent treatment systems
AssigneeDeuterium Corporation
InventorJerome S. Spevack
Life of this patent
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Abstract
A liquid feed and effluent system to recover dissolved process gas (e.g. H.sub.2 S) from an effluent process liquid (e.g. water), which liquid may also contain dissolved solid components (e.g. soluble salts); the system heats the feed liquid with heat recovered from the effluent liquid, saturates the so heated feed liquid with process gas, which gas may also contain inert gas components, and separately discharges from the system such inert gas components and effluent liquid from which process gas and heat have been recovered. In the combination the dissolved process gas is preferably recovered from the effluent liquid by flashing at progressively reduced pressures and final vapor stripping thereof at the most reduced pressure.
Claims5
An improved process for treatment of the liquid water feed and effluent of a gas and liquid contact system, in which system a flow of gas consisting essentially of hydrogen sulfide previously saturated with water vapor and a flow of liquid consisting essentially of water previously saturated with hydrogen sulfide are contacted with each other at elevated temperature and pressure, and from which system a purge stream of said gas is discharged, said water feed contains dissolved minerals of heavy metal capable of conversion to insoluble sulfides and being essentially free of hydrogen sulfide, which treatment process comprises:
- (a) treating said water feed prior to its introduction into said system by
- (1) heating the water feed by transferring heat thereto from said effluent,
- (2) reacting hydrogen sulfide with said dissolved minerals to precipitate insoluble sulfides therefrom,
- (3) dissolving hydrogen sulfide in the so heated water feed to an amount essentially corresponding to saturation at said elevated temperature and pressure by countercurrent contact of said heated water feed with said purge stream essentially at said elevated pressure, and
- (4) seperating said insoluble sulfides from said water feed,
- (b) introducing the so treated water feed into said gas and liquid contact system,
- (c) treating said precipitated solid sulfides chemically to form hydrogen sulfide therefrom, and
- (d) separately removing and returning to said contact system hydrogen sulfide gas formed in step (c).
Dependencies are inferred from the claim text.