US1283114A - Process of refining sulfite wood-pulp for nitrating or similar purposes. - Google Patents
Process of refining sulfite wood-pulp for nitrating or similar purposes. Download PDFInfo
- Publication number
- US1283114A US1283114A US24080118A US24080118A US1283114A US 1283114 A US1283114 A US 1283114A US 24080118 A US24080118 A US 24080118A US 24080118 A US24080118 A US 24080118A US 1283114 A US1283114 A US 1283114A
- Authority
- US
- United States
- Prior art keywords
- pulp
- refining
- cellulose
- sulfite
- wood
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
- D21C9/083—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with inorganic compounds
-
- 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
- Y10S162/05—Alpha cellulose
Definitions
- This invention relates especially to the refining or purification of wood pulp produced by the sulfite or acid or-other chemi cal process from suitable wood, such as spruce, hemlock, fir or spruce balsam so as to secure a refined wood pulp of low caustic potash solubility and of such color and other properties as makes it suitable for the production of nitrated cellulose of various grades or other generally similar cellulose acetate or other cellulose compounds.
- suitable wood such as spruce, hemlock, fir or spruce balsam
- the bleached pulp may be cooked under pressure in an alkaline or soda cooking'liquor for two to four hours or so to convert and remove the undesirable colored or other components of the wood pulp. Thorough washing removes these undesirable hydrocellulose or oxycellulose compounds and the refined pulp, which may have a caustic potash solubility of less than seven per cent. may then be used for nitrating or the like or may be further bleached in some cases.
- Sulfite wood pulp from such sources may with advantage be first bleached which may be elfected, where the pulp is originally in the unbleached condition in which it is dis-- charged from the digesters, by bleaching it fifteen per cent. or so of bleaching powder as compared to the dry weight of the unbleached wood pulp may be used for this purpose and the pulp bleached in a water solution thereof for about four to eight hours or until it is bleached to a yellowish color or to the usual light or whitish color for some purposes.
- the pulp is thoroughly washed to remove the bleaching powder and coloring matter, etc., and in some cases it is desirable to have the wood pulp in quite thoroughly bleached condition before submitting it to the caustic soda or alkaline refining treatment.
- This treatment dissolves or removes the undesirable oxycellulose and hydrocellulose components which are of course preferably thoroughly removed by repeated washing of the pulp after its removal from the digester.
- This refined pulp is usually sutliciently light colored to be used for most nitrocellulosepurposes, although if desired, the pulp may be subjected to a further bleaching treatment with awater solution of bleaching powder for two or three hours which is usually suflic ient to give a good white color to the refined pulp in this connection.
- the refined bleached sulfite pulp has a low caustic potash solubility which may be reduced to five or six per cent. or so in this way, so that the refined sulfite pulp may thus be produced well within seven per cent.
- caustic potash solubility which is the present standard for cotton used for nitro-cellulose potash solubility thereof.
- the process of refining sulfite wood pulp to render it suitable for nitro-cellulose manufacture or the like which comprises bleaching and Washing the wood'pulp and subjecting the same to a strong alkaline refining treatment with an alkaline water solution to dissolve and remove oxy-cellulose or to a strong alkaline refining treatment by boilingunder pressure for several hours in a water solution of'alkaline refining material to dissolve and remove the oxy-cellulose or hydro-cellulose components from the pulp and washing the refined pulp and bleaching the same to produce pulp having a low caustic potash solubility.
- the process of refining sulfite vegetable fiber pulp to render the same suitable for nitro-cellulose manufacture or the like which comprises bleaching and washing the pulp, subjecting the same to an alkaline refining treatment by boiling under pressure for several hours in a water solution of alkali refining material to dissolve and remove the oXy-cellulose or hydro-cellulose components from the pulp and washing the refined pulp to produce pulp having a low caustic potash solubility.
Description
40 with chlorin or bleaching powder. Five to car as ATNT enrich.
VIGGO DREWSEN, F BROOKLYN, NEW YORK, ASSIGNOR TO WEST VIRGINIA PULP & PAPER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.
PROOF S OF REFINING SULFITE WOOD-PULP FOR NITRATING OR SIMILAR PURPOSES.
Specification of Letters Patent.
'1\To Drawing. Continuation of application Serial No. 220,848, filed March 6, 1918. This application filed June 19, 1918. Serial No. 240,801.
To all zchom it may concern:
Be it known that I. l'leco DREWSEX, a
citizen of the United States. and resident of borough of Brooklyn, county of Kings,
city and State of New York, have made a.
certain new and useful Invention Relating to Processes of Refining Sulfite- \Vood-Pulp for Nitrating or Similar Purposes, of which the following is aspecification.
This invention relates especially to the refining or purification of wood pulp produced by the sulfite or acid or-other chemi cal process from suitable wood, such as spruce, hemlock, fir or spruce balsam so as to secure a refined wood pulp of low caustic potash solubility and of such color and other properties as makes it suitable for the production of nitrated cellulose of various grades or other generally similar cellulose acetate or other cellulose compounds. The original sulfite pulp may be partially bleached with any suitable bleaching agents,
such as bleaching powder, chlorin, water or gas and then after washing, the bleached pulp may be cooked under pressure in an alkaline or soda cooking'liquor for two to four hours or so to convert and remove the undesirable colored or other components of the wood pulp. Thorough washing removes these undesirable hydrocellulose or oxycellulose compounds and the refined pulp, which may have a caustic potash solubility of less than seven per cent. may then be used for nitrating or the like or may be further bleached in some cases.
Sulfite wood pulp from such sources may with advantage be first bleached which may be elfected, where the pulp is originally in the unbleached condition in which it is dis-- charged from the digesters, by bleaching it fifteen per cent. or so of bleaching powder as compared to the dry weight of the unbleached wood pulp may be used for this purpose and the pulp bleached in a water solution thereof for about four to eight hours or until it is bleached to a yellowish color or to the usual light or whitish color for some purposes. The pulp is thoroughly washed to remove the bleaching powder and coloring matter, etc., and in some cases it is desirable to have the wood pulp in quite thoroughly bleached condition before submitting it to the caustic soda or alkaline refining treatment. since otherwise pulp of some grades might become undesirably or permanently stained so thatit could not be sodium hydrate or other similar alkaline material capable of dissolving or removing from the pulp the undesirable oxy-cellulose, hydrocellulose or coloring matter. Caustic soda seems to give good results in this connection when some five to twelve per cent. or so of caustic soda as compared to the dry weight of the bleached sulfite pulp is used and a relatively dilute solution of the caustic soda is usually sutticient for this purpose, such as a three to eight per cent. water solution thereof. The bleached pulp may be cooked in this alkaline refining liquor for two to four hours or so in a (ligester at a pressure of, say, forty to one hundred pounds per square inch. 'This treatment dissolves or removes the undesirable oxycellulose and hydrocellulose components which are of course preferably thoroughly removed by repeated washing of the pulp after its removal from the digester. This refined pulp is usually sutliciently light colored to be used for most nitrocellulosepurposes, although if desired, the pulp may be subjected to a further bleaching treatment with awater solution of bleaching powder for two or three hours which is usually suflic ient to give a good white color to the refined pulp in this connection.
The refined bleached sulfite pulp has a low caustic potash solubility which may be reduced to five or six per cent. or so in this way, so that the refined sulfite pulp may thus be produced well within seven per cent. caustic potash solubility which is the present standard for cotton used for nitro-cellulose potash solubility thereof.
This invention has been described in connection with a number of illustrative processes, orders of steps, materials, proportions, arrangements and methods of treatment and use, to the details of which disclosure the invention is not of course to be taken, since what is claimed as new and What is desired to be secured by Letters Patent is: I I
1. The process of refining sulfite wood pulp from spruce, hemlock, fir or balsam wood to render the same suitable fornitrocellulose manufacture which comprises thoroughly bleaching the wood pulp from the digester for four to eight hours with a Water solution of bleaching powder and Washing the bleached pulp, subjecting the same to an alkaline refining treatment by boiling under pressure for several hours in a caustic soda water solution to dissolve and remove the oxy-cellulose and hydrocellulose com ponents from the pulp, washing the refined pulp and bleaching the samewith bleaching powder to decolorize the pulp while still keepingiits caustic potash solubility below I seven per cent.
r 2. The process of refining sulfite wood pulp to render it suitable for nitro-cellulose manufacture or the like which comprises bleaching and Washing the wood'pulp and subjecting the same to a strong alkaline refining treatment with an alkaline water solution to dissolve and remove oxy-cellulose or to a strong alkaline refining treatment by boilingunder pressure for several hours in a water solution of'alkaline refining material to dissolve and remove the oxy-cellulose or hydro-cellulose components from the pulp and washing the refined pulp and bleaching the same to produce pulp having a low caustic potash solubility.
4:. The process of refining chemical wood pulp 'to render the same suitable for nitrocellulose manufacture which comprises thoroughly bleaching the wood pulp from the digester for four to eight hours with a watei solution of bleaching powder and washing the bleached pulp, subjecting the same to an alkaline refining treatment by boiling under pressure for several, hours in a caustic soda water solutionto dissolve and remove the oxy-cellulose and hydro-cellulose components from the pulp and keep its caustic potash solubility below about seven per cent.
.5. The process of refining sulfite vegetable fiber pulp to render the same suitable for nitro-cellulose manufacture or the like, which comprises bleaching and washing the pulp, subjecting the same to an alkaline refining treatment by boiling under pressure for several hours in a water solution of alkali refining material to dissolve and remove the oXy-cellulose or hydro-cellulose components from the pulp and washing the refined pulp to produce pulp having a low caustic potash solubility.
6. The process Ofrefining sulfite wood pulp to render 1t suitable for nitro-cellulose manufacture or the like which comprises bleaching and washing the Wood pulp and subjecting the same to an alkaline refining treatment with an alkaline water solution to dissolve and remove oxy-cellulose or hydrocellulose components and reduce the caustic potash solubility of-the pulp.
VIGGO DREWSEN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24080118A US1283114A (en) | 1918-06-19 | 1918-06-19 | Process of refining sulfite wood-pulp for nitrating or similar purposes. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24080118A US1283114A (en) | 1918-06-19 | 1918-06-19 | Process of refining sulfite wood-pulp for nitrating or similar purposes. |
Publications (1)
Publication Number | Publication Date |
---|---|
US1283114A true US1283114A (en) | 1918-10-29 |
Family
ID=3350700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US24080118A Expired - Lifetime US1283114A (en) | 1918-06-19 | 1918-06-19 | Process of refining sulfite wood-pulp for nitrating or similar purposes. |
Country Status (1)
Country | Link |
---|---|
US (1) | US1283114A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482858A (en) * | 1947-08-13 | 1949-09-27 | Celanese Corp | Cellulose purification |
US2558054A (en) * | 1949-03-16 | 1951-06-26 | Celanese Corp | Purification of cellulosic materials |
-
1918
- 1918-06-19 US US24080118A patent/US1283114A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482858A (en) * | 1947-08-13 | 1949-09-27 | Celanese Corp | Cellulose purification |
US2558054A (en) * | 1949-03-16 | 1951-06-26 | Celanese Corp | Purification of cellulosic materials |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB427626A (en) | Improvements in or relating to the manufacture of cellulose | |
US2394989A (en) | Manufacture of cellulose | |
US1283114A (en) | Process of refining sulfite wood-pulp for nitrating or similar purposes. | |
US2014761A (en) | Process for the manufacture of solutions from cellulose | |
US2228127A (en) | Bleaching hardwood pulp | |
US1829852A (en) | Manufacture of cellulose from straw | |
US2074339A (en) | Preparation of cellulosic material | |
US2120678A (en) | Bleaching and purifying process | |
US2625474A (en) | Acid-alkali process for the preparation of cellulose fibers | |
US2036606A (en) | Chemical purification and modification of cellulose fiber | |
US2694631A (en) | Process of preparing wood pulp | |
US2249174A (en) | Process for producing white wood pulp of high solution viscosity and purity | |
US1283113A (en) | Process of refining wood-pulp for nitrating or similar purposes. | |
US2380706A (en) | Production of refined wood pulp | |
US1310694A (en) | Vance p | |
US2140863A (en) | Process for producing a pure white cellulose | |
US1822125A (en) | Method for the treatment of cellulosic materials | |
US1741540A (en) | Process for the production of high-alpha cellulose fiber for the manufacture of cellulose derivatives | |
US1705897A (en) | Bleaching of pulp | |
US2127765A (en) | Bleaching pulp | |
US1229422A (en) | Process of making fiber for paper, &c. | |
US1749003A (en) | Mercerized wood-fiber tissue and process of preparing same | |
US1829110A (en) | Purification of cellulose fiber | |
US1906885A (en) | Process for the preparation of high alpha cellulose fiber for conversion into cellulose derivatives | |
US1599489A (en) | Process for the manufacture of high alpha-cellulose fiber |