SU130779A1 - Pulp Production Method - Google Patents

Description

The increase in the resistance of cellulose fibers to the action of elevated temperature is of great practical interest, since in a number of cases, for example, during the operation of the viscose cord, the fibers are subjected to prolonged temperature effects.

To improve the thermal stability of cellulose, hydrated cellulose, and other modifications of it, a method is proposed for treating these products, which consist in removing the salts of w-fir, of fir-tree metals to a ash content of 0.05%.

. It has been established that the hydrated cellulose fibers containing an increased amount of salts w, of fir metals, lose after 10 hours of heating at a temperature of 150 about 25% of the initial strength and about 35% of elongation. After an alternate 3-5-step treatment of wood pulp containing an increased amount of silk metals, with a 0.3-0.5% hydrochloric acid solution and water at a temperature of 20-30 °, the ash content of the wood pulp decreases to 0.03%.

Fibers containing a small amount of salts of silk metals, after 10 hours of heating at a temperature of 150 °, lose 19% of the initial strength and about 20% elongation.

Thus, it can be seen that the removal of salts of silk metals leads to less loss of strength and elongation of cellulose hydrate fibers at elevated temperatures.

Subject invention

The method of producing cellulose, cellulose hydrate and other modifications thereof, characterized in that, in order to increase the thermal stability of cellulose, alkali metal salts are removed from the latter by conventional methods to an ash content of 0, .05%.