Process for the preparation of cellulose pulp by cooking with nitric acid

Process for the preparation of cellulose pulp by treating a raw material of plant origin with water at a temperature of 110-170 degrees C under a pressure of 2-7 atm (gauge) for 0.3-4 hours, the ratio between the weight of the vegetable material and that of the water being 1 : 2-4. The plant materia...

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Bibliographische Detailangaben
Hauptverfasser:	1E J BEIZER, M A IVANOV, G G BAKINA, V I LOSIK, J S KHROL, V M KRJUKOV, V S GROMOV, 1L I STOLYAROVA, 1T K VASILEVSKAYA, V I SOROKIN, V G USHAKOV, 1S I ANDABURSKY, A V OSIPOV, 1V G KENIN
Format:	Patent
Sprache:	eng ; swe
Schlagworte:	APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES
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Beschreibung
Zusammenfassung:	Process for the preparation of cellulose pulp by treating a raw material of plant origin with water at a temperature of 110-170 degrees C under a pressure of 2-7 atm (gauge) for 0.3-4 hours, the ratio between the weight of the vegetable material and that of the water being 1 : 2-4. The plant material is simultaneously cooked and impregnated with a solution of nitric acid at 70-90 degrees C for 0.5-3 hours. This is followed by cooking of the material at 100-130 degrees C under a pressure of 1-4 atm (gauge) for 0.3-5 hours. The plant material is extracted with an alkali, and the gaseous cooking products are decontaminated by mixing them with air in a ratio of 1 : 0.5-1 by volume. The waste alkali obtained in the alkaline extraction stage is treated. The invention makes it possible to increase the cellulose yield and to improve the quality of the product considerably.