Patents Assigned to Pipco, Inc.
  • Process for recovery of sulfur values from a gas stream
    Patent number: 5057298
    Abstract: The invention is a process wherein SO.sub.2 is absorbed in a concentrated solution of potassium citrate and the solution is reacted with H.sub.2 S at a temperature above the melting point of sulfur to form elemental sulfur. The reaction produces a solution lean in sulfur dioxide. SO.sub.2, in the form of a rich solution or a gas, can be introduced into the lean solution in order to inhibit post-formation of sulfur. This introduction of SO.sub.2 avoids a tendency for sulfur to form continually after the solution exits the reaction zone.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: October 15, 1991
    Assignee: Pipco, Inc.
    Inventors: William G. Ray, John C. Arbo, George E. Gryka