Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1995-12-14
1997-11-04
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560198, 560200, 560240, C07C 6748, C07C 6724
Patent
active
056841795
ABSTRACT:
An improved method for recovering purified diesters of polytetramethylene ethers involving the polymerization of tetrahydrofuran (THF) optionally with one or more comonomers (e.g., 3-methyl THF, ethylene oxide, propylene oxide, or the like) utilizing a solid acid catalyst (e.g., Nafion.RTM.) and a carboxylic acid with carboxylic acid anhydride (e.g., acetic acid with acetic anhydride) as molecular weight control agents wherein after polymerization product recovery involves bulk flashing of unreacted THF and stripping of remaining THF, carboxylic acid and carboxylic acid anhydride (e.g., acetic acid and acetic anhydride) by use of superheated THF. Such a process is useful in producing high purity commercial grade PTMEA that advantageously avoids problems associated with the presence of high boilers when converting to PTMEG.
REFERENCES:
patent: 4120903 (1978-10-01), Pruckmayr et al.
patent: 4163115 (1979-07-01), Heinsohn et al.
patent: 4167115 (1979-09-01), Stoever
patent: 4460796 (1984-07-01), Mueller
patent: 4584414 (1986-04-01), Pruckmayr
patent: 5118869 (1992-06-01), Dorai et al.
patent: 5130470 (1992-07-01), Dorai et al.
patent: 5149862 (1992-09-01), Dorai et al.
Dees Jos,e G.
E. I. Du Pont de Nemours and Company
Williams Rosalynd A.
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