Process for producing regenerated cellulosic articles and for re

Details Process for producing regenerated cellulosic articles and for re Process for producing regenerated cellulosic articles and for re

1981-03-18

1982-03-09

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

106168, 264187, 536 56, C08B 0000

Patent

active

043190235

ABSTRACT:
A process for producing regenerated cellulosic articles from cellulose which has been dissolved in a mixture of dimethyl sulfoxide (DMSO) and formaldehyde, and for recovering the solvent chemicals. The DMSO/formaldehyde solution of cellulose is brought into contact with an aqueous solution, the pH of which is at least 9 and the adjustment of pH has been carried out by means of a base or an alkaline salt which does not react with formaldehyde and the content of which is at most 0.1% by weight, so that the product is coagulated and regenerated in the desired form, such as fibres, films or shaped articles. The coagulation solution is evaporated in one stage or plurality of stages so that the DMSO and formaldehyde of the cellulose solution remain in the evaporation residue. The evaporation residue is recycled for the production of cellulose solution, purified, if so required.

REFERENCES:
patent: 4017642 (1977-04-01), Orth et al.
patent: 4022631 (1977-05-01), Turbak et al.
patent: 4073660 (1978-02-01), Portnoy et al.
patent: 4082617 (1978-04-01), Portnoy et al.
patent: 4097666 (1978-06-01), Johnson et al.
patent: 4173613 (1979-11-01), Rodier
patent: 4281063 (1981-07-01), Tsao et al.

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