DE681668C - Process for the production of wood cellulose flours which can be softened in water and which are used in particular as animal feed - Google Patents

Description

Process for the preparation of water-softenable and in particular Wood cellulose flours used as animal feed It has already been proposed that for the production of animal feed and also as an additive for dietetic foods Cellulose, especially wood cellulose, treated with dilute mineral acids to undergo until the cellulose fibers are friable when moist have become, an effect that z. B. with cardboard-shaped sulfite pulp Treatment with 75 to 80 ° warm z ° / qiger hydrochloric acid lasting about 60 to 90 minutes or is achieved by an equivalent acid treatment, whereupon the optional neutralized and washed out cellulose fibers wet in disk mills or the like. be crushed.

Celluloses suitable as starting material for this process can be used with the help of the cooking process common in the sulphite pulp mills from "all eligible types of wood, e.g. B. also made of pine wood, obtained in this way that the wood is not, as usual, into blocks, but much further is crushed.

However, many have such celluloses even after their destruction Fibers, the property that they, when dry, water extremely poorly accept and also by soaking in water for days, even by boiling, cannot be brought back to the pulpy state that they were in before drying have owned. -The -individual cellulose granules remain even after complete Soaked with water so hard that they won't rub between your fingers permit. As a result of this behavior a good digestion of the in itself digestible substance especially in pigs, one was previously forced to use cellulose products the described Kind of refraining from drying in the original to feed in a moist state or to wet the substance again before feeding make and so for the purpose of 7th grinding of the grains again in the mentioned row mills or the like. To grind.

Celluloses, which are obtained in particular from largely comminuted wood waste by cooks using the sulfite process and whose fibers have been made friable and pulverized by the action of mineral acids in a moist state and which show the disruptive behavior described, can be converted according to the invention into easily re-softenable dry products, @ that they initially i. dried, e.g. for some time in a solution of alkalis, e.g. B. a 1/2 to 1 % strength soda or caustic soda solution of about 70 to 100 ° soaked for a period of about 10 to 15 minutes, 3. washed with water, dried again.

The alkali treatment depends naturally in each case on the nature of the cellulose preparation to be treated.

The at i. Required drying is an essential requirement for success. Namely, it is originally wetter or more wet and Once again subjected to the alkali treatment of mechanically ground material, leave it like that dry products which can be sufficiently softened cannot be achieved even if substantially more concentrated and boiling solutions are used.

The effect of the alkali treatment is best when the one preceding it Drying at higher temperatures - up to over 100 ° - is accomplished. In In this case, namely, products are obtained in which the final drying can take place without damage under appropriately high temperatures, while dried at ordinary temperatures and then treated with an alkali solution Fabric only gives a re-softenable end product, even if the final drying takes place at low temperatures.

Of course, the drying temperatures must never be chosen so high that carbonization of the cellulose occurs. Exemplary embodiment 100 kg of cellulose, previously dried at temperatures of 100 to 120 °, are poured into Zoo 1 in a 7o to 100 ° warm 1120/0 solution of soda and thoroughly stirred. After 10 to 15 minutes, the soda solution is drained off, whereby about 250 liters of intensely brown. The remaining cellulose is washed thoroughly with cold water until the alkaline reaction disappears and then dried. Practically 100 kg of a cellulose product which is now easily softenable in water are obtained again.

Whereas in known processes, alkalis are used to dissolve resins etc. or for the partial destruction of the encrusting substances during processing have been used by cellulosic raw materials, aims in the present Case in point is the aftertreatment of celluloses, the fibers of which are friable when moist made and ground with alkalis to remove impurities derived from the chemical salts used for digestion and in general especially in the digestion of largely comminuted wood according to the sulfite process enter.

Claims (2)

PATENT CLAIMS: i. Process for the preparation of water-softenable and in particular wood cellulose flours used as animal feed by alkaline ones Treatment of celluloses, characterized in that in particular from largely shredded wood waste 'celluloses obtained by boiling using the sulphite process, the fibers of which are made friable when moist by the action of mineral acids and. ground, dried, then treated with a weak alkaline solution and dried again after washing with water. 2. The method according to claim i, characterized in that the alkali treatment preceding and the following Drying takes place at higher temperatures up to over 100%.