Patent ID: 11878267
Assignee: NANJING TECH UNIVERSITY
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 0:
1. A method for separating a hydrogen/carbon dioxide mixed gas, comprising:
using a mixed matrix membrane to separate the hydrogen/carbon dioxide mixed gas at a temperature from 10° C. to 40° C. to allow hydrogen preferentially penetrate through the mixed matrix membrane to separate the hydrogen from the carbon dioxide,
wherein a pressure at a feed side of the mixed matrix membrane ranges from 0.1 bar to 5 bar; a molar ratio of the hydrogen to the carbon dioxide is 1:1 and a corresponding partial pressure of each of the hydrogen and the carbon dioxide ranges from 0.05 bar to 2.5 bar;
wherein the mixed matrix membrane comprises a polymer matrix and an M(SiF6)(pyz)3 nanoparticle dispersed in the polymer matrix, wherein M is selected from the group consisting of Cu, Zn, Co, and Ni, pyz is pyrazine; and
the mixed matrix membrane is prepared by the following steps;
step 1: dissolving the polymer matrix in water to obtain a matrix solution, and dissolving an MSiF6 metal salt in water to obtain a salt solution;
step 2: mixing the matrix solution and the salt solution in a mass ratio to obtain a coating solution, coating the coating solution on a carrier, and conducting evaporation to remove a solvent, wherein during the mixing, a mass of the MSiF6 metal salt is 9% to 91% of a total mass of the metal salt and the polymer matrix; and
step 3: placing the carrier obtained in the step 2 in a ligand vapor to allow a reaction to obtain the mixed matrix membrane, wherein the ligand vapor is pyrazine.