PROCEDURE FOR PRECIPITATING CELLULOSE DERIVATIVES

摘要

The present invention provides a process for precipitating cellulose carbamate from an aqueous alkali solution. The solution is brought into contact with an aqueous solution of sulphuric acid containing one or several cations selected from the group consisting of Na, Al, Mg, Zn and Ca cations, whereby in the precipitation of cellulose carbamate the advantage is gained that the dry solids contents of the fibre can be made sufficiently high.