Patents Assigned to Intermountain Research & Development Corp.
  • Enhanced recovery of soda ash from aqueous sodium carbonate solutions containing Na.sub.2 SO.sub.4 - and NaCl
    Patent number: 4519806
    Abstract: A method for enhancing the recovery of dense soda ash from Na.sub.2 SO.sub.4 - and NaCl-containing aqueous sodium carbonate solutions by first co-crystallizing anhydrous sodium carbonate and burkeite and next introducing the co-crystallized solids to an aqueous medium at elevated temperature to dissolve the burkeite and cause reversion of the anhydrous sodium carbonate solids to crystalline sodium carbonate monohydrate, which is then separated from the dissolved sulfate and recovered as product.
    Type: Grant
    Filed: November 26, 1982
    Date of Patent: May 28, 1985
    Assignee: Intermountain Research & Development Corp.
    Inventors: William C. Copenhafer, Michael L. Pinsky
  • Solution mining of trona or nahcolite ore with aqueous NaOH and HCl solvents
    Patent number: 4498706
    Abstract: Separate deposits of trona or nahcolite ore are solution mined with two solvents, aqueous sodium hydroxide and aqueous hydrogen chloride. Aqueous sodium carbonate solution is withdrawn from the region of the NaOH-treated ore deposit, for recovery of soda ash. Aqueous sodium chloride brine is withdrawn from the region of the HCl-treated ore deposit and introduced to an electrodialysis cell to regenerate the two solvents and thereby continue the solution mining cycle.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: February 12, 1985
    Assignee: Intermountain Research & Development Corp.
    Inventors: Joseph M. Ilardi, David Goldstein