A carbon molecular sieve adsorbent prepared from activated carbon and useful for propylene-propane separation

摘要

The process for preparing a carbon molecular sieve adsorbent composition comprises initiating with activated carbon having a specific effective pore size. The activated carbon is impregnated with a monomer or a partially polymerized polymer to complete the polymerization and then carbonized so that the impregnant shrinks the micropores to another specific effective micropore size. Finally, the impregnated / polymerized / carbonized product is annealed at a temperature in the range of 1000 0 C to 1500 0 C to ultimately and predictably shrink the micropores to a size in the range of 4.0 angstroms to 4.3 angstroms. Surprisingly, the present invention provides a process for the preparation of the desired micropore size, as well as the desired micropore size, in order to obtain a highly desirable carbon molecular sieve capacity, which is particularly suitable for use in a fixed bed, for example in a pressure swing or temperature swing process, The selectivity, the capacity and the adsorption rate can be finely adjusted.