Search Patents
  • Higher density ion exchange resins of metal compound precipitated within pores
    Patent number: 4477597
    Abstract: Macroporous ion exchange resins having increased apparent density are provided by incorporating into said resins a weighting agent which is of greater apparent density than the resin itself. Such weighted resins exhibit reduced bed expansion when used with upflow streams, with relatively dense liquids, and with relatively viscous liquids.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: October 16, 1984
    Assignee: The Dow Chemical Company
    Inventors: John M. Lee, William C. Bauman, Richard A. Wolcott, John L. Burba, III
  • Crystalline lithium aluminates
    Patent number: 4348296
    Abstract: Porous substrates containing seeds of hydrous crystalline alumina are contacted with an aqueous solution of alkaline aluminate, thereby causing additional crystalline hydrous alumina to grow on the seeds within the pores of the substrate.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: September 7, 1982
    Assignee: The Dow Chemical Company
    Inventors: William C. Bauman, John M. Lee, John L. Burba, III
  • Crystalline 3-layer lithium aluminates
    Patent number: 4540509
    Abstract: Ion exchange resins in the base form, e.g., DOWEX MWA--1--OH ion exchange resin, which contain crystalline Al(OH).sub.3, e.g., gibbsite, and/or bayerite, and/or norstrandite, are treated with hot, concentrated LiX solutions (where X is anion) to prepare 3-layer crystalline LiX.2Al(OH).sub.3.nH.sub.2 O in the resin.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: September 10, 1985
    Assignee: The Dow Chemical Company
    Inventor: John L. Burba, III
  • Crystalline lithium aluminates
    Patent number: 4348295
    Abstract: Crystalline hydrous aluminas, Al(OH).sub.3, are reacted with LiX, where X is anion, under appropriate conditions to prepare crystalline compounds conforming substantially to the empirical formulaLiX.2Al(OH).sub.3.nH.sub.2 Owhere X is anion and nH.sub.2 O represents waters of hydration. Depending on the beginning hydrous alumina, some of the crystalline compounds are of a novel 2-layer unit cell structure and some of a 3-layer unit cell structure.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: September 7, 1982
    Assignee: The Dow Chemical Company
    Inventor: John L. Burba, III
  • Method of making crystalline 2-layer lithium aluminates in ion exchange resins
    Patent number: 4461714
    Abstract: The bayerite form of crystalline alumina, Al(OH).sub.3, contained within a macroporous ion exchange resin is converted to the gibbsite form of Al(OH).sub.3 by reaction with hot MgX.sub.2, where X is halide, followed by water-washing the MgX.sub.2 portion from the product, thereby causing the conversion of bayerite to the gibbsite form of crystalline Al(OH).sub.3. The gibbsite form may then be reacted with hot LiX solution, where X is anion, to form crystalline 2-layer LiX.2Al(OH).sub.3.nH.sub.2 O.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: July 24, 1984
    Assignee: The Dow Chemical Company
    Inventor: John L. Burba, III
  • Crystalline 2-layer lithium-hydroxy aluminates
    Patent number: 4477367
    Abstract: Crystalline 2-layer LiOH.2Al(OH).sub.3.nH.sub.2 O, preferably supported by a porous substrate, is prepared by treating crystalline 2-layer LiX.2Al(OH).sub.3.nH.sub.2 O, where X is anion, with a LiOH solution or other hydroxide ion source. The so-formed crystalline 2-layer LiOH.2Al(OH).sub.3.nH.sub.2 O is particularly suitable for exchange of the OH ion with larger X' ions to produce other crystalline 2-layer LiX'.2Al(OH).sub.3.nH.sub.2 O.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: October 16, 1984
    Assignee: The Dow Chemical Company
    Inventor: John L. Burba, III