FI51114C - Preparation of cellulose pulp by a multi-stage ammonia-polysulfide process. - Google Patents

Preparation of cellulose pulp by a multi-stage ammonia-polysulfide process.

Info

Publication number: FI51114C
Authority: FI; Finland
Prior art keywords: preparation; cellulose pulp; stage ammonia; polysulfide process; polysulfide
Prior art date: 1969-10-08

Application number

FI702507A

Other languages

Finnish (fi)

Swedish (sv)

Other versions

FI51114B (en

Inventor

David W Clayton

Asahi Sakai

Original Assignee

Pulp Paper Res Inst

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1969-10-08

Filing date

1970-09-11

Publication date

1976-10-11

1970-09-11 Application filed by Pulp Paper Res Inst filed Critical Pulp Paper Res Inst

1976-06-30 Publication of FI51114B publication Critical patent/FI51114B/fi

1976-10-11 Application granted granted Critical

1976-10-11 Publication of FI51114C publication Critical patent/FI51114C/en

Classifications

- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds

FI702507A 1969-10-08 1970-09-11 Preparation of cellulose pulp by a multi-stage ammonia-polysulfide process. FI51114C (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US86474069A	1969-10-08	1969-10-08

Publications (2)

Publication Number	Publication Date
FI51114B FI51114B (en)	1976-06-30
FI51114C true FI51114C (en)	1976-10-11

Family

ID=25343957

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FI702507A FI51114C (en)	1969-10-08	1970-09-11	Preparation of cellulose pulp by a multi-stage ammonia-polysulfide process.

Country Status (4)

Country	Link
US (1)	US3661698A (en)
FI (1)	FI51114C (en)
NO (1)	NO130020B (en)
SE (1)	SE354301B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CA1013903A (en) *	1973-06-04	1977-07-19	Union Camp Corporation	Method of pulping with polysulfide
US5041192A (en) *	1988-09-16	1991-08-20	University Of South Florida	Supercritical delignification of wood
US7828930B2 (en) *	2007-11-20	2010-11-09	International Paper Company	Use of polysulfide in modified cooking
FI127420B (en) *	2011-06-23	2018-05-31	Andritz Oy	Process for producing cellulose pulp
US20190226142A1 (en) *	2018-01-19	2019-07-25	Jim Constantacos	Method for improved pulping using an environmentally friendly pulping aid

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2944928A (en) *	1957-09-20	1960-07-12	Kibrick	Method of preparing paper pulp

1969
- 1969-10-08 US US864740A patent/US3661698A/en not_active Expired - Lifetime
1970
- 1970-07-31 NO NO02972/70A patent/NO130020B/no unknown
- 1970-09-11 FI FI702507A patent/FI51114C/en active
- 1970-10-01 SE SE13352/70A patent/SE354301B/xx unknown

Also Published As

Publication number	Publication date
FI51114B (en)	1976-06-30
US3661698A (en)	1972-05-09
SE354301B (en)	1973-03-05
NO130020B (en)	1974-06-24

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Legal Events

Date	Code	Title	Description
1993-05-03	BB	Publication of examined application