Method for manufacturing diacetate esters of polytetramethylene

Details Method for manufacturing diacetate esters of polytetramethylene Method for manufacturing diacetate esters of polytetramethylene

1997-11-26

1999-10-05

Shippen, Michael L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

568617, C07C 6748

Patent

active

059627271

ABSTRACT:
An improved method for manufacturing 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 setting the pressure of the reactor while simultaneously achieving removal of the heat of reaction by operating under solvent/monomer evaporative reaction conditions effectively controls the reaction temperature. Such a process is useful in producing high purity commercial grade PTMEA that advantageously avoids problems caused by the high heat of reaction when such a process is scaled up to commercial level.

REFERENCES:
patent: 4120903 (1978-10-01), Pruckmayr et al.
patent: 4163115 (1979-07-01), Heinsohn et al.
patent: 4167115 (1979-09-01), Stoever
patent: 5118869 (1992-06-01), Dorai et al.
patent: 5130470 (1992-07-01), Dorai et al.
patent: 5149862 (1992-09-01), Dorai
patent: 5282929 (1994-02-01), Dorai et al.
patent: 5302255 (1994-04-01), Dorai et al.
patent: 5344964 (1994-09-01), Chu

Affiliated with

Also associated with

Rating

Method for manufacturing diacetate esters of polytetramethylene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for manufacturing diacetate esters of polytetramethylene , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing diacetate esters of polytetramethylene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1173495