SYSTEM AND METHOD FOR GAS TREATMENT

摘要

PROBLEM TO BE SOLVED: To provide a system and a process for the recovery of at least one halogenated hydrocarbon from a gas stream.SOLUTION: The recovery includes adsorption by exposing the gas stream to an adsorbent with a lattice structure having pore diameters with an average pore opening of between about 5 and about 50 Å. The adsorbent is then regenerated by exposing the adsorbent to a purge gas under conditions which efficiently desorb the at least one adsorbed halogenated hydrocarbon from the adsorbent. The at least one halogenated hydrocarbon (and impurities or reaction products) can be condensed from the purge gas and subjected to fractional distillation to provide a recovered halogenated hydrocarbon. An adsorbent for adsorbing a halogenated hydrocarbon comprises: a first adsorbent comprising a silica that has an organophilic pore lattice structure with an average pore opening of between 5 and 10 Å; and a second adsorbent comprising an amorphous silica that has an organophilic pore lattice structure with an average pore opening of between 15 and 30 Å, in which the first adsorbent is separated from the second adsorbent and the adsorbent for adsorbing a halogenated hydrocarbon has AlOcontent of less than 10 mass%.SELECTED DRAWING: Figure 1