C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/215
C08B 15/06 (2006.01) C08B 3/14 (2006.01) D01F 2/24 (2006.01)
Patent
CA 1236094
ABSTRACT OF THE DISCLOSURE A cyclic process for producing an alkali solution of cellulose carbamate, for precipitating the cellulose car- bamate from the alkali solution, and for recovering and re- cycling the chemicals, comprises the following steps: (a) an alkali solution of cellulose carbamate is prepared by dis- solving cellulose carbamate in an aqueous solution of sodium hydroxide, (b) the solution obtained in step (a) is brought 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 passed for transform- ing the sodium hydroxide into sodium carbonate, (d) the solu- tion obtained in step (c) is treated with calcium oxide, whereby the sodium carbonate is transformed into sodium hydroxide, and calcium carbonate precipitates from the solu- tion, (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 cal- cium oxide is returned to step (d). In step (b), the pre- cipitating solution contains 10-30% by weight, preferably 20-25% by weight, sodium carbonate. In step (b) the preci- pitating solution contains a maximum of 6% by weight, pre- ferably not more than 3% by weight, sodium hydroxide.
491570
Eklund Vidar
Fors Jan
Huttunen Jouko
Selin Johan-Fredrik
Turunen Olli T.
Marks & Clerk
Neste Oy
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