Cyclic process for producing an alkali solution of cellulose car

Details Cyclic process for producing an alkali solution of cellulose car Cyclic process for producing an alkali solution of cellulose car

1985-09-24

1987-01-27

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

264187, C08B 300, D01F 200

Patent

active

046395156

ABSTRACT:
The present invention concerns a cyclic process for producing an alkali aqueous solution of cellulose carbamate, for precipitating the cellulose carbamate from the alkali solution and for recovering and recycling the remaining chemicals. The process comprises the following steps: (a) an alkali solution of cellulose carbamate is prepared by dissolving cellulose carbamate in an aqueous solution of sodium hydroxide, (b) the solution obtained in step (a) is contacted with a precipitation aqueous solution containing sodium carbonate, whereby the cellulose carbamate is precipitated and can be removed, (c) from the solution in step (b) sodium carbonate is crystallized and is returned to the precipitant solution in step (b), and (d) mother liquor containing sodium hydroxide, obtained, i.e. remaining from, step (c), is returned to step (a) for dissolving cellulose carbamate. The crystallizing in step (c) is accomplished in two or several steps by cooling.

REFERENCES:
patent: 2103639 (1937-12-01), Richter
patent: 2231927 (1941-02-01), Lilienfeld
patent: 2265916 (1941-12-01), Lilienfeld
patent: 2283809 (1942-05-01), Izard
patent: 2371359 (1945-03-01), Shutt
patent: 4404369 (1983-09-01), Huttunen et al.
patent: 4456749 (1984-06-01), Mandell et al.
patent: 4567255 (1986-01-01), Eklund et al.

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