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

Claim 8:
9. The continuous preparation method of 2,3,3,3-tetrafluoropropene according to claim 1, wherein a membrane used in the first membrane separator is a composite nanofiltration membrane, and a preparation method of the membrane comprises the following steps:
step a, placing 0.25 to 1 part of carbon nanotubes by weight into 100 parts of solvent N,N-dimethylformamide by weight, and carrying out ultrasonic dispersion for 4 h to 6 h to obtain a mixed solution;
step b, placing 30 to 60 parts of polyvinylidene fluoride by weight and 18 to 40 parts of polyimide by weight into the mixed solution obtained in the step a, and stirring the solution for 10 h to 20 h to obtain a casting solution;
step c, resting the casting solution, obtained in the step b, at 25° C. to 30° C. for 24 h to 48 h to obtain a degassed casting solution;
step d, scraping the degassed casting solution obtained in the step c at 10° C. to 20° C. to obtain a scraped casting solution; and
step e, volatilizing the scraped casting solution, obtained in the step d, in the air for 1 min to 5 min, placing the volatilized casting solution in deionized water so that the casting solution is coagulated into a membrane, taking out the formed membrane from the coagulating solution, and rinsing the membrane with deionized water, thus obtaining the composite nanofiltration membrane.