Catalyst for addition reaction of alkylene oxide and use thereof
The present invention provides a catalyst for an addition reaction of alkylene oxide, the catalyst comprises a nanocomposite ion-exchange resin having a structural formula of P-Im + -M − , wherein P is a nanocomposite resin matrix, Im + is a cation derived from 5-6 membered heterocycle containing at least one nitrogen atom such as imidazolium cation, pyrazolium cation, pyrrolidinium cation, piperidinium cation, piperazinium cation, pyrimidinium cation, pyrazinium cation, pyridazinium cation, triazinium cation, and M − is an anion. The catalyst of the present invention can be used in the addition reaction of alkylene oxide and carbon dioxide. The catalyst has high wear resistance, high swelling resistance, and high activity. The products after the reaction are easy to separate, and the catalyst can be used continuously many times.
1 . A catalyst for addition reaction of alkylene oxide, comprising a nanocomposite ion-exchange resin having a structural formula of P-Im + -M − ,
wherein P is a nanocomposite resin matrix, Im + is a cation derived from 5-6 membered heterocycle containing at least one nitrogen atom, M − is an anion,
wherein the nanocomposite resin matrix comprises a repeating unit represented by formula I and a repeating unit of —CH(POSS)—CH 2 —,
in formula I, R 1 -R 8 are identical to or different from each other, and each independently selected from hydrogen and C 1 -C 6 alkyl;
POSS is a polyhedral oligomeric silsesquioxane, which has a general formula of (—SiO 1.5 )m, and m is 6, 8, 10, or 12.
2 . The catalyst according to claim 1 , wherein the catalyst comprises the following structure:
wherein R 1 -R 3 are identical to or different from each other, and each independently selected from hydrogen and C 1 -C 6 alkyl;
R 4 -R 8 are each independently selected from hydrogen, C 1 -C 6 alkyl, and CH 2 Im + -M − , and at least one of R 4 -R 8 is CH 2 Im + -M − .
3 . The catalyst according to claim 2 , wherein R 4 -R 8 are each independently selected from hydrogen and CH 2 Im + -M − , and at least one of R 4 -R 8 is CH 2 Im + -M − .
4 . The catalyst according to claim 1 , wherein said M is one or more of halide ions and organic acid radical ions;
and/or, a mass content of POSS in the nanocomposite resin matrix P is 0.1-10%.
5 . The catalyst according to claim 4 , wherein the mass content of POSS in the nanocomposite resin matrix P is 0.2-5%.
6 . The catalyst according to claim 4 , wherein the mass content of POSS in the nanocomposite resin matrix P is 2-5%.
7 . The catalyst according to claim 1 , wherein Im + is an imidazolium cation, pyrazolium cation, pyrrolidinium cation, piperidinium cation, piperazinium cation, pyrimidinium cation, pyrazinium cation, pyridazinium cation, or triazinium cation.
8 . The catalyst according to claim 1 , wherein the C 1 -C 6 alkyl is hydrogen, methyl, ethyl, propyl, or butyl.
9 . The catalyst according to claim 1 , wherein the M is one or more of a fluoride ion, a chloride ion, a bromide ion, an iodide ion, an acetate group, a formate group, and a bioxalate group.
10 . The catalyst according to claim 1 , wherein Im + is a cation derived from 5-6 membered heteroarene containing at least one nitrogen atom.
11 . A process for preparing a catalyst as claimed in claim 1 , comprising the following steps:
S1: polymerizing a styrene-based monomer, a cross-linking agent, and a polyhedral oligomeric silsesquioxane in the presence of an initiator to obtain a nanocomposite resin matrix P;
S2: subjecting the nanocomposite resin matrix P obtained in step S1 to a chloromethylation reaction, an imidazolation reaction, and an ion-exchange reaction.
12 . The process according to claim 11 , wherein said styrene-based monomer is one or more of styrene-based monomers represented by formula II;
in formula II, R 1 -R 8 are identical to or different from each other, and each independently selected from hydrogen and C 1 -C 6 alkyl;
and/or, said polyhedral oligomeric silsesquioxane is one or more of a vinyl-containing silsesquioxane, a hydrogen-containing polysilsesquioxane, an alkoxy-containing polysilsesquioxane, and an epoxy-containing polysilsesquioxane;
and/or, said cross-linking agent is one or more of ethylene glycol bismethacrylate, dipropenylbenzene, divinylphenylmethane, and divinylbenzene;
and/or, said initiator is at least one of benzoyl peroxide, azodiisobutyronitrile, azodiisoheptylonitrile, lauroyl peroxide, and cumene hydroperoxide,
and/or, in step S1, based on the total weight of raw materials, a mass of said styrene-based monomer is 85-95%, a mass of the cross-linking agent is 1-6%, a mass of said polyhedral oligomeric silsesquioxane is 0.1-10%, and a mass of the initiator is 0.1-5%.
13 . The method according to claim 12 , wherein the vinyl-containing silsesquioxane is an octavinylsilsesquioxane.
14 . A method for an addition reaction of alkylene oxide and carbon dioxide, which comprises reacting alkylene oxide and carbon dioxide in the presence of the catalyst according to claim 1 .
15 . The method according to claim 14 , wherein the alkylene oxide has a general formula of
wherein, R 9 -R 12 are identical to or different from each other and each independently selected from hydrogen, C 1 -C 6 alkyl, and C 6 -C 10 aryl; and/or,
a mass ratio of the catalyst to the alkylene oxide is (0.001-1):1.
16 . The method according to claim 15 , wherein the C 6 -C 10 aryl is phenyl.
17 . The method according to claim 14 , wherein a reaction temperature is 60-180° C.; and/or a reaction pressure is 0.1-10.0 MPa; and/or, a reaction time is 1-8 hours.
18 . A method for an addition reaction of alkylene oxide and carbon dioxide, which comprises reacting alkylene oxide and carbon dioxide in the presence of a catalyst prepared with the method according to claim 11 .