Patents Assigned to Brunner Mond & Company Limited
  • High density aqueous compositions
    Patent number: 5643858
    Abstract: Aqueous compositions for use as drilling fluids or as workover fluids/completion fluids comprise calcium chloride and calcium nitrate. The compositions have a density of at least 1.35 g cm.sup.-3 and the weight ratio of calcium chloride to calcium nitrate is 5:95 to 95:5. The compositions may be formulated so as to have low crystallisation temperatures. Additional densifying agents such as calcium bromide and/or zinc bromide may also be included.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: July 1, 1997
    Assignee: Brunner Mond & Company Limited
    Inventor: Graham Edward Woolley
  • Production of alkali metal carbonates
    Patent number: 5562890
    Abstract: A method of producing an alkali metal carbonate, e.g. sodium carbonate, comprises passing a solution or suspension of the alkali metal chloride and bicarbonate over an ion exchange resin which is chloride retaining and has a basicity greater than that of the bicarbonate ion. The product is an aqueous or suspension of the alkali metal carbonate. In the case where the alkali metal is sodium, the product may be used for brine purification in a conventionl Ammonia Soda process.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: October 8, 1996
    Assignee: Brunner Mond and Company Limited
    Inventor: Richard D. A. Woode