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US 2020/0346185 A1Published application
Phenothiazine based crosslinked polymer and methods thereof
AssigneeKing Fahd University of Petroleum and Minerals
InventorsOthman Charles Sadeq Al Hamouz, Mahmoud Mohamed Abdelnaby
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Abstract
Crosslinked polymers made up of polymerized units of phenothiazine, pyrrole, and aldehyde. The crosslinked polymers are porous with a BET surface area in the range of 300-600 m2/g. A method of synthesizing the crosslinked polymers is described. Processes for using the crosslinked polymers as adsorbent materials for adsorbing gases (e.g. CO2 capturing), and separating fluid mixtures under dry and wet conditions are also introduced.
Claims20
1:
- A crosslinked polymer, comprising reacted units of:
- a phenothiazine monomer of formula (I)
- or a salt thereof, a solvate thereof, a tautomer thereof a stereoisomer thereof, or a mixture thereof;
- a pyrrole monomer of formula (II)
- or a salt thereof, a solvate thereof, a tautomer thereof a stereoisomer thereof, or a mixture thereof;
- and
- an aldehyde of formula (III)
- or a salt thereof, a solvate thereof, a stereoisomer thereof, or a mixture thereof,
- wherein:
- R1, R2, R3, R4, R5, and R6 are independently selected from the group consisting of a hydrogen, an optionally substituted alkyl, an optionally substituted cycloalkyl, an optionally substituted arylalkyl, an optionally substituted aryl, an optionally substituted alkoxy, and an optionally substituted alkylthio;
- R7 is selected from the group consisting of a hydrogen, an optionally substituted alkyl, an optionally substituted cycloalkyl, and an optionally substituted arylalkyl;
- R8 is selected from the group consisting of a hydrogen, an optionally substituted alkyl, an optionally substituted cycloalkyl, an optionally substituted arylalkyl, and an optionally substituted aryl;
- and
- R9 is selected from the group consisting of a hydrogen, an optionally substituted alkyl, an optionally substituted cycloalkyl, an optionally substituted arylalkyl, and an optionally substituted aryl.
11 more elements
2:
- The crosslinked polymer of claim 1, wherein R7 is a hydrogen.
3:
- The crosslinked polymer of claim 1, wherein the phenothiazine monomer of formula (I) is
4:
- The crosslinked polymer of claim 1, wherein the pyrrole monomer of formula (II) is
5:
- The crosslinked polymer of claim 1, wherein the aldehyde of formula (III) is formaldehyde.
6:
- The crosslinked polymer of claim 1, wherein a molar ratio of the pyrrole monomer of formula (II) to the phenothiazine monomer of formula (I) is in a range of 1:1 to 6:1.
7:
- The crosslinked polymer of claim 1, wherein a molar ratio of the aldehyde of formula (III) to the phenothiazine monomer of formula (I) is in a range of 3:1 to 12:1.
8:
- The crosslinked polymer of claim 1, wherein a molar ratio of the pyrrole monomer of formula (II) to the phenothiazine monomer of formula (I) is in a range of 2.5:1 to 3.5:1, and wherein a molar ratio of the aldehyde of formula (III) to the phenothiazine monomer of formula (I) is in a range of 5:1 to 7:1.
9:
- The crosslinked polymer of claim 1, which has a BET surface area in the range of 300-600 m2/g.
10:
- The crosslinked polymer of claim 1, which is porous with an average pore width of 0.8-2 nm.
11:
- The crosslinked polymer of claim 1, which has a CO2 uptake capacity in a range of 15-45 cm3/g at a temperature of 0-40° C. and a pressure of 400-800 Torr.
12:
- The crosslinked polymer of claim 1, which has an ideal selectivity of CO2 over N2 in a range of 10-60.
13:
- A method of making the crosslinked polymer of claim 1, the method comprising:
- mixing the phenothiazine monomer of formula (I) and the aldehyde of formula (III) in a solution comprising a solvent to form a first mixture;
- mixing the pyrrole monomer of formula (II) and an acid with the first mixture to form a second mixture;
- and
- heating the second mixture thereby forming the crosslinked polymer.
2 more elements
14:
- The method of claim 13, wherein the acid is ferric chloride.
15:
- The method of claim 13, wherein the solvent comprises dimethylformamide.
16:
- The method of claim 13, wherein the second mixture is heated at a temperature of 70-150° C.
17:
- A method of separating a first gas from a fluid mixture comprising the first gas and a second gas, the method comprising:
- contacting the fluid mixture with the crosslinked polymer of claim 1;
- and
- adsorbing the first gas onto the crosslinked polymer thereby separating the first gas from the fluid mixture and forming a first gas loaded crosslinked polymer.
1 more element
18:
- The method of claim 17, wherein the first gas is CO2, and wherein the second gas is N2.
19:
- The method of claim 17, wherein the fluid mixture further comprises H2O.
20:
- The method of claim 18, further comprising:
- desorbing the first gas from the first gas loaded crosslinked polymer by flowing N2 gas over the first gas loaded crosslinked polymer to regenerate the crosslinked polymer;
- and
- reusing the crosslinked polymer.
1 more element