Indexed by:
期刊论文
First Author:
Wang, Hanli
Correspondence Author:
Ruan, XH; He, GH (reprint author), Dalian Univ Technol Panjin, Sch Petr & Chem Engn, Panjin 124221, Peoples R China.
Co-author:
Dai, Yan,Ruan, Xuehua,Jiang, Xiaobin,Yan, Xiaoming,Xiao, Wu,He, Gaohong
Date of Publication:
2018-03-01
Journal:
JOURNAL OF MEMBRANE SCIENCE
Included Journals:
SCIE、EI
Document Type:
J
Volume:
549
Page Number:
403-410
ISSN No.:
0376-7388
Key Words:
Gas membrane separation; Tetrafluoroethylene; Polymerization purge;
Pseudo-steady process; Process optimization
Abstract:
In tetrafluoroethylene (TFE) batch polymerization, H-2 is utilized to stabilize pressure and control reaction degree. TFE lost in the purge can account for about 6.0% of the loaded monomer. In this work, membrane-based separation system was presented to effectually reduce TFE loss. Polyimide asymmetric membrane with J(H2) up to 196 GPU and alpha(H2/TFE) higher than 1680 was developed for the separation. A pseudo-steady process was customized to sufficiently complete TFE recovery within the 30-min idle period after batch polymerization. With the procedure that H-2-enriched permeate is compressed back into the reactor, it is succeeded to overcome the limits that the purge is gradually falling in pressure and the TFE-enriched stream is hazardous in compression. In this instance, TFE recovery ratio was increased to about 90%. For a 5.0-kt/a TFE polymerization unit, the investment for the separation system is about 2.56 x 10(5) USD, the running payout is less than 4.35 x 10(4) USD/a, and meanwhile the annual gross profit can be up to 3.126 x 10(6) USD. On the whole, gas membrane separation is a promising technique to reduce TFE loss in the batch polymerization processes.
Translation or Not:
no
