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

046395148

ABSTRACT:
The present invention concerns a cyclic process for producing an alkali solution of cellulose carbamate, for precipitating the cellulose carbamate from the alkali solution and for recovering and recycling the 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 extruded into contact with a precipitating solution containing sodium carbonate, whereby the cellulose carbamate is precipitated and can be separated from the solution, (c) into the solution obtained in step (b) carbon dioxide is conducted for transforming the sodium hydroxide into sodium carbonate, (d) the solution obtained in step (c) is treated with calcium oxide, whereby the sodium carbonate is transformed into sodium hydroxide, and calcium carbonate precipitates from the solution, (e) solution containing sodium hydroxide obtained in step (d) is returned to step (a) for dissolving cellulose carbamate, and (f) calcium carbonate obtained in step (d) is decomposed into carbon dioxide and calcium oxide and the calcium oxide is returned to step (d).

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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