METHOD OF PRODUCING CELLULOSE STOCK FROM HARDWOOD Russian patent published in 1997 - IPC

Abstract RU 2092641 C1

FIELD: pulp-and- paper industry. SUBSTANCE: wood chip is digested with mixture of concentrated acetic acid and hydrogen peroxide in presence of phosphoric acid catalyst. Hydrogen peroxide consumption is 1.7-3.4% based on chip weight and that of phosphoric acid 0.25-1.0% based on digestion liquid volume. Digestion is carried out at 100-120 C and water duty 1:1 for 1-2 h. Acetic acid is then steam stripped and alkali extraction with 4% NaOH is performed at 150 C and water duty 1:4 for 1 h. EFFECT: enhanced efficiency of process. 1 tbl

Similar patents RU2092641C1

Title	Year	Author	Number
PROCESS FOR PREPARING CELLULOSE SEMIFINISHED PRODUCT FROM WOOD OF DECIDUOUS VARIETIES	1992	Zil'Berglejt Мark Аronovich[By] Smolova Inna Vasil'Evna[By] Simkhovich Вoris Semenovich[By]	RU2019609C1
METHOD OF PREPARING CELLULOSE INTERMEDIATE	1999	Danilov V.G. Kuznetsova S.A. Kuznetsov B.N.	RU2150538C1
METHOD OF PRODUCING CELLULOSE SEMIFINISHED PRODUCT	0	Zilberglejt Mark Aronovich Simkhovich Boris Semenovich Karalchuk Taisiya Vyacheslavovna Smolova Inna Vasilevna	SU1724765A1
METHOD OF PRODUCING CELLULOSE SEMIFINISHED PRODUCT	0	Zilberglejt Mark Aronovich Simkhovich Boris Semenovich Karalchuk Taisiya Vyacheslavovna Smolova Inna Vasilevna	SU1724764A1
METHOD OF CELLULOSE OBTAINING	2013	Kuznetsov Boris Nikolaevich Garyntseva Natal'Ja Viktorovna	RU2547689C1
METHOD OF PRODUCING SEMIFINISHED PULP PRODUCT	0	Zilberglejt Mark Aronovich Simkhovich Boris Semenovich Reznikov Vsevolod Mikhajlovich	SU1308665A1
METHOD OF PRODUCTION OF CELLULOSE	2012	Kuznetsov Boris Nikolaevich Jatsenkova Ol'Ga Vladimirovna Danilov Vladimir Grigor'Evich	RU2490384C1
METHOD OF PREPARING CELLULOSE HALF-FINISHED PRODUCT	2001	Danilov V.G. Kuznetsov B.N. Kuznetsova S.A. Jatsenkova O.V.	RU2181807C1
METHOD OF PRODUCING PAPER PULP	0	Zilberglejt Mark Aronovich Simkhovich Boris Semenovich Osipov Anatolij Vladimirovich Reznikov Vsevolod Mikhajlovich	SU1261991A1
METHOD OF PRODUCING CELLULOSE INTERMEDIATE PRODUCT	2009	Mamleeva Nadezhda Alekseevna Autlov Stanislav Arturovich Bazarnova Natal'Ja Grigor'Evna Lunin Valerij Vasil'Evich	RU2413045C1

RU 2 092 641 C1

Authors

Zil'Berglejt Mark Aronovich[Ua]

Smolova Inna Vasil'Evna[Ua]

Dates

1997-10-10—Published

1992-05-14—Filed