Patent ID: 6190562
Filing Date: 2001-02-20
Classification: B01D,B01J

Abstract:
A process for treating a liquid feed stream containing an iodine-containing compound comprising contacting the liquid feed stream with an adsorbent comprising a crystalline manganese phosphate which has an extended network and a composition on an anhydrous basis expressed by an empirical formula of:(A.sup.a+).sub.v (Mn.sup.b+)(M.sup.c+).sub.x P.sub.y O.sub.zwhere A is selected from the group consisting of alkali metals, alkaline earth metals. hydronium ion, ammonium ion, organoammonium ions, silver, copper (II), zinc (II), nickel (II) mercury (II), cadmium (II), and mixtures thereof, ""a"" represents a weighted average valence of A and varies from 1.0 to 2.0, ""v"" is the mole ratio of A to Mn and varies from about 0.1 to about 10.0, ""b"" is the average valence of Mn and has a value of greater than 2 to about 4, M is a metal selected from the group consisting of Al, Fe.sup.3+, Ga, Sn.sup.4+, Ti, Sb.sup.5+, Ag, Zn, Cu, Ni, Cd, and mixtures thereof, ""x"" is the mole ratio of M to Mn and varies from 0 to about 3.0, ""c"" is the weighted average valence of M and varies from about 1.0 to about 5.0, ""y"" is the mole ratio of P to Mn and varies from about 0.1 to about 8.0, and ""z"" is the mole ratio of O to Mn and has a value determined by the equation:z=1/2(a.cndot.v+b+x.cndot.c+5.cndot.y), andthe crystalline manganese phosphate further has been cation exchanged with a metal selected from the group consisting of silver, mercury, copper, lead, thallium, palladium, and mixtures thereof; at conditions effective to adsorb the iodine-containing compound on the adsorbent to yield a treated liquid stream.