Patent ID: 11939277
Assignee: ZHEJIANG JUHUA TECHNOLOGY CENTER CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 9:
10. The continuous preparation method of 2,3,3,3-tetrafluoropropene according to claim 3, wherein a membrane used in the second membrane separator is a modified nanofiltration membrane, and a preparation method of the membrane comprises the following steps:
step a′, cleaning a polyethersulfone base membrane with deionized water, and soaking the polyethersulfone base membrane in deionized water for 8 h to 12 h, and changing the deionized water every 2 h, thus obtaining the soaked polyethersulfone base membrane;
step b′, placing the soaked polyethersulfone base membrane, obtained in the step a′, in a polyacrylic acid solution with a concentration of 0.05 to 0.1 mol/L, the polyacrylic acid solution immersing the polyethersulfone base membrane for 2 cm to 5 cm, and bubbling with N2 for 0.5 h to lh to remove oxygen out of the solution; and
step c′, under the protection of nitrogen at room temperature, using a low-pressure mercury lamp with a power of 400 W to 800 W to irradiate the solution obtained in the step b′ for 50 min to 120 min, and then taking out the membrane, and rinsing the membrane with deionized water, thus obtaining the modified nanofiltration membrane.