Process for the production of a dry desalting cellulose acetate

Details Process for the production of a dry desalting cellulose acetate Process for the production of a dry desalting cellulose acetate

1974-12-05

1976-05-18

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

210500M, 264217, B29D 702, B29D 2704

Patent

active

039579352

ABSTRACT:
This invention relates to an improvement in the process for the production of a dry cellulose acetate membrane comprising forming a sheet material from a cellulose acetate solution, treating the sheet material with a liquid and drying, the improvement comprising treating the sheet material with an aqueous solution of a polyvalent aliphatic alcohol having 2 to 4 carbon atoms for about 2 to 10 minutes at a temperature in the range of about 50.degree. to 110.degree.C, and drying said sheet material at a temperature not in excess of about 50.degree.C.

REFERENCES:
patent: 3567809 (1971-03-01), Ueno et al.
patent: 3592672 (1971-07-01), Rowley et al.
patent: 3772072 (1973-11-01), Brown et al.
patent: 3780147 (1973-12-01), Stana
Vos, Kenneth D. and F. O. Burris, "Drying Cellulose Acetate Reverse Osmosis Membranes" in I & EC Product Research and Development, Vol. 8, No. 1, Mar. 1969, pp. 84-89.

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