Free radical post-crosslinked adsorbent and method of preparation
AssigneeRohm and Haas Company
InventorsMancai Xu, Zheng Zhang
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Abstract
A post-crosslinked adsorbent comprises: monomer units of (a) at least 55 wt % at least one polyvinylaromatic monomer and (b) up to 45 wt % at least one monovinylaromatic monomer; and 0.5-2.5 mmol/g pendent vinyl groups; wherein the dry adsorbent has BET specific surface area in the range of about 650-1000 m2/g, BET average pore diameter 7.2-10 nm, BET porosity 1.29-2.45 mL/g, BJH adsorption micropore volume was less than 20% of total BJH adsorption pore volume, and HK micropore volume was less than 21% of total BJH adsorption pore volume. The invention is also directed to a preparation method for the polymeric adsorbent.
Claims8
A method for preparing a polymeric adsorbent comprises the steps of:
- (i) suspension copolymerizing monomers comprising at least one polyvinylaromatic monomer and at least one monovinylaromatic monomer in the presence of water insoluble organic compound as porogen;
- (ii) post-crosslinking the copolymer with the porogen in the presence of free radical initiator and porogen/water co-solvent;
- and
- (iii) isolating the post-crosslinked adsorbent.
Dependencies are inferred from the claim text.