Adsorbent particles, method for producing adsorbent particles, base material particles, filling column, and method for recovering rare earth element
View Patent ↗Adsorbent particles including: porous carrier particles containing an organic polymer; polyethylenimine attached to a surface of the porous carrier particles; and a diglycolic acid residue bonded to an amino group of the polyethylenimine. A most frequent pore size of the porous carrier particles exceeds 10 nm.
1 . Adsorbent particles comprising:
porous carrier particles comprising an organic polymer;
polyethylenimine attached to a surface of the porous carrier particles; and
a diglycolic acid residue bonded to an amino group of the polyethylenimine,
wherein a most frequent pore size of the porous carrier particles exceeds 10 nm,
a pore volume of the porous carrier particles is 5.0 mL/g to 30 mL/g, and
an amount of an amino group in the adsorbent particles is 0.1 to 100 mmol per 1 g of the adsorbent particles.
2 . The adsorbent particles according to claim 1 , wherein a number average molecular weight of the polyethylenimine as measured by ebullioscopy is 1500 or more.
3 . The adsorbent particles according to claim 1 , wherein a viscosity of the polyethylenimine is 8000 mPa·s or more.
4 . The adsorbent particles according to claim 1 , wherein the organic polymer is a polymer comprising a monomer unit derived from a styrene-based monomer.
5 . A method for producing adsorbent particles, the method comprising:
preparing base material particles comprising porous carrier particles containing an organic polymer and polyethylenimine attached to a surface of the porous carrier particles; and
bonding diglycolic acid or an anhydride thereof to an amino group of the polyethylenimine to form adsorbent particles,
wherein a most frequent pore size of the porous carrier particles exceeds 10 nm,
a pore volume of the porous carrier particles is 5.0 mL/g to 30 mL/g, and
an amount of an amino group in the adsorbent particles is 0.1 to 100 mmol per 1 g of the adsorbent particles.
6 . The method according to claim 5 ,
wherein the organic polymer comprises a constitutional unit having a reactive group, and
the base material particles are prepared by bonding the polyethylenimine to the organic polymer by a reaction between the reactive group and the polyethylenimine.
7 . Base material particles comprising:
porous carrier particles containing an organic polymer; and
polyethylenimine attached to a surface of the porous carrier particles,
wherein a most frequent pore size of the porous carrier particles exceeds 10 nm,
a pore volume of the porous carrier particles is 5.0 mL/g to 30 mL/g, and
an amount of an amino group in the base material particles is 0.1 to 100 mmol per 1 g of the base material particles.
8 . The base material particles according to claim 7 , wherein a number average molecular weight of the polyethylenimine as measured by ebullioscopy is 1500 or more.
9 . The base material particles according to claim 7 , wherein a viscosity of the polyethylenimine is 8000 mPa·s or more.
10 . The base material particles according to claim 7 , wherein the organic polymer is a polymer including a monomer unit derived from a styrene-based monomer.
11 . The base material particles according to claim 7 , wherein the base material particles are used for forming adsorbent particles comprising a diglycolic acid residue bonded to an amino group of the polyethylenimine.
12 . A filled column comprising: a column main body; and the adsorbent particles according to claim 1 filled in the column main body.
13 . A method for recovering a rare earth element, the method comprising:
bringing a solution containing a rare earth element into contact with the adsorbent particles according to claim 1 to adsorb the rare earth element on the adsorbent particles; and
desorbing the rare earth element from the adsorbent particles by contact with an acidic solution containing an acid.
14 . The adsorbent particles according to claim 1 , wherein the most frequent pore size of the porous carrier particles is 12 nm to 100 nm.
15 . The method according to claim 5 , wherein the most frequent pore size of the porous carrier particles is 12 nm to 100 nm.
16 . The base material particles according to claim 7 , wherein the most frequent pore size of the porous carrier particles is 12 nm to 100 nm.