Patent ID: 9694344
Date: 2017-07-04
CPC Classifications: B01J,Y02C

Claim:
1. A method for making a multilayer sorbent polymeric membrane comprising at least one layer comprising sorbent materials of about 5 wt. % to about 100 wt. % and a plurality of interconnecting pores, the method comprising: (a) coextruding layer-forming compositions comprising a matrix polymer to form a multilayer coextrudate, wherein at least one of the layer-forming compositions further comprising the sorbent materials and a diluent; (b) cooling the multilayer coextrudate to form a multilayer film; (c) extracting the diluent from the multilayer film with an extractant; and (d) removing the extractant from the extracted film to form the multilayer sorbent polymeric membrane, wherein the matrix polymer is a film-forming thermoplastic polymer selected from the group of petroleum-based polymers, bio-based polymers, biodegradable polymers and combinations thereof; wherein the sorbent materials present in the at least one layer retain their initial sorbability and/or their initial porosity of about 50% to about 100%; wherein the at least one layer has a porosity of about 5% to about 85%; and wherein the multilayer sorbent polymeric membrane is asymmetric.