US1032229A - Process for bleaching old papers, paper-stock, straw, &c. - Google Patents
Process for bleaching old papers, paper-stock, straw, &c. Download PDFInfo
- Publication number
- US1032229A US1032229A US64458211A US1911644582A US1032229A US 1032229 A US1032229 A US 1032229A US 64458211 A US64458211 A US 64458211A US 1911644582 A US1911644582 A US 1911644582A US 1032229 A US1032229 A US 1032229A
- Authority
- US
- United States
- Prior art keywords
- stock
- straw
- bleaching
- paper
- old papers
- 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
- 238000000034 method Methods 0.000 title description 8
- 238000004061 bleaching Methods 0.000 title description 6
- 239000010902 straw Substances 0.000 title description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 9
- AGVJBLHVMNHENQ-UHFFFAOYSA-N Calcium sulfide Chemical compound [S-2].[Ca+2] AGVJBLHVMNHENQ-UHFFFAOYSA-N 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 235000006408 oxalic acid Nutrition 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 159000000014 iron salts Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 1
- XOJVVFBFDXDTEG-UHFFFAOYSA-N Norphytane Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 description 1
- 240000002805 Triticum turgidum Species 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1026—Other features in bleaching processes
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Definitions
- My invention relates to a process for bleaching old papers, paper stock, straw, etc., and it consists in the'various steps hereinafter set forth.
- An object of my invention is to provide a process by means of which the coloring matter, ink, etc., may be removed from old papers so as to make stock of pristine whiteness.
- a further object of my .invention is to provide a process for bleaching paper stock in which there are iron salts.
- a further object of my invention is to provide a process which is comparatively simple and inexpensive for carrying out the first-mentioned objects.
- the material to be bleached is first beaten into a pulp with water.
- a quantity of alka- 1 line sulfid is then added. This may consist of calcium sulfid (Gas) or potassium sulfid (K S). The addition of the calcium sulfid decomposes the coloring matter.
- the pulp is then washed in the customary way and neutralizedjwith oxalic acid C I LU and is the solution with oxalic acid and subsequently treating with hyposulfurous acid.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Description
No Drawing.
7 JOHN H. MELCHERS, OF DECATUR, ILLINOIS.
PROQESS FOR BLEACHING OLD PAPERS, PAPER-STOCK, STRAW, 8w.
oaaaaa.
To all whom it may concern Be it known that I, JOHN H. MnLoHERs, a citizen of the United States, and a resident of Decatur, in the county of Macon and State of Illinois, have invented a new and, Improved Process for Bleaching Old- Papers, Paper-Stock, Straw, &c., of which the following is a full, clear, and exact description.
My invention relates to a process for bleaching old papers, paper stock, straw, etc., and it consists in the'various steps hereinafter set forth. I
An object of my invention is to provide a process by means of which the coloring matter, ink, etc., may be removed from old papers so as to make stock of pristine whiteness.
A further object of my .invention is to provide a process for bleaching paper stock in which there are iron salts.
A further object of my invention is to provide a process which is comparatively simple and inexpensive for carrying out the first-mentioned objects.
-In the bleachingof old papers which contain ink, anilin, colors etc., the difliculty has heretofore been ingetting rid of the iron salts which exist, or which are formed by precipitation. These salts tend to give the pulp a yellowish tint even when the main. substance of the coloring matter is .destroyed. The manner in 'whichIovercome this difliculty is best explained by outlining the operations necessary for carrying out my process.
Specification of Letters Patent;
Patented July 9, 1912 Application filed August 17, 1911. Serial No. 644,582.
The material to be bleached is first beaten into a pulp with water. A quantity of alka- 1 line sulfid is then added. This may consist of calcium sulfid (Gas) or potassium sulfid (K S). The addition of the calcium sulfid decomposes the coloring matter. The pulp is then washed in the customary way and neutralizedjwith oxalic acid C I LU and is the solution with oxalic acid and subsequently treating with hyposulfurous acid.
2. The herein described process of bleach ing old papers, paper stock, straw, etc., which consists in pulping the material, treating it with calcium sulfid, neutralizing the solution with oxalic acid and-treating theneutralized solution with hyposulfurous acid.
JOHN H. MELOHERS.
Witnesses i L. C. WHEAT, JACOB H. LATHAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64458211A US1032229A (en) | 1911-08-17 | 1911-08-17 | Process for bleaching old papers, paper-stock, straw, &c. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64458211A US1032229A (en) | 1911-08-17 | 1911-08-17 | Process for bleaching old papers, paper-stock, straw, &c. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1032229A true US1032229A (en) | 1912-07-09 |
Family
ID=3100519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US64458211A Expired - Lifetime US1032229A (en) | 1911-08-17 | 1911-08-17 | Process for bleaching old papers, paper-stock, straw, &c. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1032229A (en) |
-
1911
- 1911-08-17 US US64458211A patent/US1032229A/en not_active Expired - Lifetime
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