Reducing molecular weight distribution of polyether glycols by s

Details Reducing molecular weight distribution of polyether glycols by s Reducing molecular weight distribution of polyether glycols by s

1992-09-15

1994-02-01

Manoharan, Virginia

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

159 49, 159DIG16, 203 89, 568617, 568621, B01D 310, C07C 4138

Patent

active

052829294

ABSTRACT:
Polyether glycols, especially poly(tetramethylene ether) glycol (PTMEG) having a narrow molecular weight distribution of about 1.90 to 2.07, or dispersity of 1.50 to 1.90, are made by a process wherein the low molecular weight fraction in unit operations using at least one short-path distillation evaporator. In these units, PTMEG is subjected to temperatures in the range of 150.degree.-190.degree.C. with the hold-up time varying between 10-200 seconds. The required vacuum to force the separation of the low molecular weight PTMEG varies between 0.001 mm and 1.0 mbar. PTMEG residue from the distillation unit is also characterized by its low water content and low concentration of oligomeric cyclic ethers.

REFERENCES:
patent: 4568775 (1986-02-01), Aoshima et al.
patent: 4585592 (1986-04-01), Mueller
patent: 4686273 (1987-08-01), Harris
patent: 4762951 (1988-08-01), Mueller
patent: 4904745 (1990-02-01), Inoue et al.
patent: 4933503 (1990-06-01), Mueller
patent: 5053553 (1991-10-01), Dorai

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