abstract |
1408847 Treating waste tyre material NITTAN CO Ltd 24 April 1974 [1 May 1973] 17968/74 Heading C3E A cation exchanger is produced from chopped, crushed or powdered waste tyre by treating the waste tyre with sulphuric anhydride. Examples are given in which chopped waste tyre is heated in the presence of sulphuric anhydride, which may be in gaseous form, 1,2-dichloroethane also being present in Example 1. The exchanger of Example 1 absorbed ammonia and trimethyl amine. |