Resumes
Resumes
Frank Rawling
View pageSkills:
Microsoft Excel
Frank Rawling Phones & Addresses
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Hockessin, DE
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32 Carriage Ln, Newark, DE 19711 (302) 731-1417 (302) 738-0913
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North Chesterfield, VA
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726 Loveville Rd APT 15, Hockessin, DE 19707 (302) 494-3783
Work
Position:
Professional/Technical
Education
Degree:
Associate degree or higher
Skills
Microsoft Excel
Publications
Us Patents
Reducing Molecular Weight Distribution Of Polyether Glycols By Short-Path Distillation
View pageUS Patent:
53022556, Apr 12, 1994
Filed:
Sep 15, 1992
Appl. No.:
7/944994
Inventors:
Suriyanarayan Dorai - Lockport NY
Frank L. Rawling - Newark DE
James A. Schultz - Swedesboro NJ
Frank L. Rawling - Newark DE
James A. Schultz - Swedesboro NJ
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
B01D 122
B01D 310
C07C 4138
B01D 310
C07C 4138
US Classification:
203 72
Abstract:
Polyether glycols, especially poly(tetramethylene ether) glycol (PTMEG) having a narrow molecular weight distribution of about 1. 25 to 1. 80, or dispersity of 1. 05 to 1. 90, are made by a process involving distilling the low molecular weight fraction in unit operations including at least one short-path distillation evaporator. Two short-path distillation evaporators, in series, are desirable if significant narrowing of the PTMEG is required. In these units, PTMEG is subjected to temperatures in the range of 270. degree. -400. 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.