Crosslinked polyester amide membranes and their use for organic

Details Crosslinked polyester amide membranes and their use for organic Crosslinked polyester amide membranes and their use for organic

1991-12-05

1994-03-01

Short, Patricia A.

Liquid purification or separation

Processes

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

210654, 525437, 528288, 4284744, B01D 6136, B01D 7106

Patent

active

052904520

ABSTRACT:
The present invention is directed to a polyester/amide membrane, its preparation and its use for organic liquid separation. The polyester/amide membrane is made by reacting a dianhydride with a polyester diol in a 2:1 to 1.05:1 mole ratio to end cap the diol to produce a prepolymer which is reacted with excess thionyl chloride to convert all of the unreacted anhydride and all carboxylic acid groups to acid chloride groups. The resulting acid chloride derivative is dissolved in organic solvent and interfacially reacted with a diamine dissolved in an aqueous solvent. The excess solutions are removed and the resulting thin film membrane is dried. The membranes are useful for organic liquid separations, especially the separation of aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons, preferably under perstraction or pervaporation conditions.

REFERENCES:
patent: 4277344 (1981-07-01), Cadotte
patent: 4654409 (1987-03-01), Shirai et al.
patent: 4946594 (1990-08-01), Thaler et al.
patent: 4963165 (1990-10-01), Blume et al.
patent: 4990275 (1991-02-01), Ho et al.
patent: 5039422 (1991-08-01), Schucker
patent: 5049281 (1991-09-01), Schucker

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