Method for recovering diacetate esters of polytetramethylene eth

Details Method for recovering diacetate esters of polytetramethylene eth Method for recovering diacetate esters of polytetramethylene eth

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.

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patent: 5130470 (1992-07-01), Dorai et al.
patent: 5149862 (1992-09-01), Dorai et al.

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