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1. (WO1991017986) PROCESS FOR THE PURIFICATION OF CYCLIC ESTERS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017986 International Application No.: PCT/US1991/002815
Publication Date: 28.11.1991 International Filing Date: 29.04.1991
Chapter 2 Demand Filed: 04.11.1991
IPC:
C07D 319/12 (2006.01)
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
319
Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
10
1,4-Dioxanes; Hydrogenated 1,4-dioxanes
12
not condensed with other rings
Applicants:
E.I. DU PONT DE NEMOURS AND COMPANY [US/US]; 1007 Market Street Wilmington, DE 19898, US
Inventors:
BHATIA, Kamlesh, Kumar; US
Agent:
KRUKIEL, Charles, E. ; E.I. du Pont de Nemours and Company Legal/Patent Records Center 1007 Market Street Wilmington, DE 19898, US
Priority Data:
528,63224.05.1990US
Title (EN) PROCESS FOR THE PURIFICATION OF CYCLIC ESTERS
(FR) PROCEDE DE PURIFICATION D'ESTERS CYCLIQUES
Abstract:
(EN) This invention relates to a gas-assisted vaporization process for purifying cyclic esters such as glycolide, lactides and mixtures thereof which enables the cyclic ester to be rapidly separated from its impurities as a vapor component of a gas stream. The process includes a solvent-scrubbing step for recovering the cyclic ester from the gas stream.
(FR) Procédé de vaporisation au gaz destiné à purifier des esters cycliques tels que du glycolide, des lactides et des mélanges de ceux-ci, ce qui permet de séparer rapidement l'ester cyclique de ses impuretés sous forme d'un constituant en phase vapeur ou d'un flux de gaz. Le procédé comprend une étape d'épuration au solvant afin de récupérer l'ester cyclique du flux de gaz.
Designated States: AU, BB, BG, BR, CA, FI, HU, JP, KR, LK, MC, MG, MW, NO, PL, RO, SD, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CM, GA, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0531462JPH05507076AU1991077754