US730439A - Process of making wood-pulp. - Google Patents
Process of making wood-pulp. Download PDFInfo
- Publication number
- US730439A US730439A US14752003A US1903147520A US730439A US 730439 A US730439 A US 730439A US 14752003 A US14752003 A US 14752003A US 1903147520 A US1903147520 A US 1903147520A US 730439 A US730439 A US 730439A
- Authority
- US
- United States
- Prior art keywords
- wood
- pulp
- digester
- liquor
- solution
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
- D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/02—Chip soaking
Definitions
- the object of my invention is to cure this defect.
- the ideal method would be to exhaust the air from the digester containing the wood and then force the cooking liquor into the wood under pressure before the steam is admitted to the contents of the digester; but
- My invention consists in the discovery that I can obtain the desired result by soaking the wood chips prior to their introduction into the digester and the ordinary cooking liquor in a solution of a monosulfite which is soluble in water, such as Na SO MgSO &c.
- a monosulfite which is soluble in water, such as Na SO MgSO &c.
- the water solution of the monosulfite is neutral, or slightly alkaline, has no odor, and
- the strength of the solution may of course be varied; but I have found that a solution of four parts of sodium sulfite (Na SOJaq) to one hundred parts of water is efficient.
Landscapes
- Paper (AREA)
Description
UNITED STATES Patented June 9, 1903.
VIGGO DREWSEN, OF NEW YORK, N. Y.
PROCESS OF MAKING WOOD -PULP.
SPECIFICATION forming part of Letters Patent No. 730,439, dated June 9, 1903.
Application filed March 12, 1903. Serial No. 147.520. (No specimens.)
To all whom it may concern.-
Be it known that I, Vreeo Dnnwsnn, a citizen of the Kingdom of Norway, residing in the city of New York, county of Kings, and State of New York, have invented a new and useful Improvement in Processes of Making Wood-Pulp, of which the following is a specification.
It is known to those skilled in the art that when wood is cooked in the bisulfite liquor the liquor must penetrate the Wood thoroughly before the temperature of the contents of the digester is raised above the boilingpoint of water. If the wood chips are not thoroughly permeated by the liquor, the sulfurous gas and the steam in the digester will cause the i'ncrusting or non-fibrous material to turn brown, and thus produce spots in the pulp.
The object of my invention is to cure this defect. v
The ideal method would be to exhaust the air from the digester containing the wood and then force the cooking liquor into the wood under pressure before the steam is admitted to the contents of the digester; but
this method of producing a vacuum and the use of pressure is too expensive for practical use. I have found that practically the same result can be obtained it the wood chips are dipped into a suitable liquor at ordinary temperatures and stored in the bins before the wood is introduced into the digester. It would not be practical, however, to use the ordinary bisulfite of lime liquor for this purpose, because the odor of the sulfurous acid is too strong and offensive and because the acid liquor destroys the material of which the bins are composed.
My invention consists in the discovery that I can obtain the desired result by soaking the wood chips prior to their introduction into the digester and the ordinary cooking liquor in a solution of a monosulfite which is soluble in water, such as Na SO MgSO &c. The water solution of the monosulfite is neutral, or slightly alkaline, has no odor, and
does not attack the material composing the bins. The strength of the solution may of course be varied; but I have found that a solution of four parts of sodium sulfite (Na SOJaq) to one hundred parts of water is efficient.
Having thus described my invention,what
-I claim is- 1. In the process of making wood-pulp by the bisulfite method, the preparatory soaking of the wood at ordinary temperatures, before introduction into the digester and the cooking liquor, in a solution of a monosulfite which is soluble in water, for a sufficient length of time to enable the solution to permeate the wood, substantially as and for the purpose described.
2. In the process of making wood-pulp by the bisulfite method, the preparatory soaking of the wood at ordinary temperatures, before introduction into. the digester and the cooking liquor, in a solution of magnesium monosulfite, MgsO for a sufiicient length of time to enable the solution to permeate the wood, substantially as and for the purpose described.
- VIGGO DREWSEN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14752003A US730439A (en) | 1903-03-12 | 1903-03-12 | Process of making wood-pulp. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14752003A US730439A (en) | 1903-03-12 | 1903-03-12 | Process of making wood-pulp. |
Publications (1)
Publication Number | Publication Date |
---|---|
US730439A true US730439A (en) | 1903-06-09 |
Family
ID=2798946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14752003A Expired - Lifetime US730439A (en) | 1903-03-12 | 1903-03-12 | Process of making wood-pulp. |
Country Status (1)
Country | Link |
---|---|
US (1) | US730439A (en) |
-
1903
- 1903-03-12 US US14752003A patent/US730439A/en not_active Expired - Lifetime
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