| abstract |
1366032 Thiol coated carbon; treating waste water BILLINGSFORS-LANGED AB 7 Feb 1972 [9 Feb 1971] 5537/72 Heading C1A and C1C [Also in Division C3] A composition comprises a solid absorbent material consisting of particulate carbon material or absorbent particulate or foam plastics material (i.e. any solid synthetic resin) having at least one thiol compound absorbed thereon. This composition may be used as a bed for absorbing ions of Hg, Ag and/or Pb from liquids, e.g. contaminated water, containing them, when passing such liquid through the bed substantially removes the stated ions. The composition may be prepared by passing a fluid comprising at least one thiol compound through the solid absorbent material so that the thiol compound is absorbed thereon. The fluid may be a gas, a liquid or a solution. The preferred carbon is an activated carbon and the preferred plastics material is a particulate vinyl polymer, which may contain polar groups, e.g. sulphonated styrenes. The preferred thiol compounds are C1 to C5 alkyl, C2-C5 alkenyl, or aryl mercaptans, and methyl, ethyl, and propyl mercaptan and thiophenol are exemplified. The thiol compound may be present in an amount from 0À5% to 10% by weight based on the solid base material. The metals may be recovered from the used absorbent. |