Method of removing water from a dilute solution of N-methylmorph

Details Method of removing water from a dilute solution of N-methylmorph Method of removing water from a dilute solution of N-methylmorph

1991-03-27

1992-06-02

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210652, B01D 6102

Patent

active

051184230

ABSTRACT:
For the removal of water from dilute aqueous solution of NMMO, N-methylmorpholine or morpholine or mixtures thereof, the solution is subjected to reverse osmosis at a pressure in excess of the osmotic pressure and probably around 40 bar and a temperature of 25.degree. C. to 75.degree. C. to form a retentate containing the amines and a permeate which is practically free from the amines. The permeate can be used as process water while the retentate can be worked up to NMMO for reuse in the cellulose solubilization process.

REFERENCES:
patent: 1144048 (1915-06-01), Muller
patent: 3228877 (1966-01-01), Mahon
patent: 4748241 (1988-05-01), Scholten et al.
patent: 4944882 (1990-07-01), Ray et al.

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