Ethylene oxide/glycols recovery process

Details Ethylene oxide/glycols recovery process Ethylene oxide/glycols recovery process

1988-02-29

1989-04-18

Mars, Howard T.

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

Organic compounds

Oxygen containing

568868, 568613, 568680, 568621, C07C 2900, C07C 2980

Patent

active

048229261

ABSTRACT:
A process for the recovery of a low concentration of ethylene oxide from an aqueous solution comprising salts, ethylene oxide and glycol which comprises the steps of:
(1) passing the aqueous solution comprising salts and ethylene oxide through a hydrolyzing zone at elevated temperature and elevated pressure for a sufficient length of time to insure the conversion of at least the greater portion of the ethylene oxide to glycols to obtain a dilute aqueous glycol solution;
(2) passing the dilute aqueous glycol solution through at least one flasher, wherein water is evaporated in the form of steam thereby producing at the bottom of the (last) flasher a solid-liquid two-phase slurry stream comprising salt-containing solids and a liquid phase comprising glycol, salt and water;
(3) sending said slurry-containing stream coming out of the (last) flasher to a centrifuge and centrifuging such stream to produce a solid phase and a liquid phase; and
(4) passing said centrifuged liquid phase to a flasher wherein glycols are separated.

REFERENCES:
patent: 3904656 (1975-09-01), Broz
patent: 3970711 (1976-07-01), Reiche et al.
patent: 4427507 (1984-01-01), van Aken
Freitas, E. R. et al., Shell's Higher Olefins Process, Chemical Engineering Progress, vol. 75, No. 1, pp. 73-76.

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