US1584902A - Art of making pulp for paper - Google Patents
Art of making pulp for paper Download PDFInfo
- Publication number
- US1584902A US1584902A US682310A US68231023A US1584902A US 1584902 A US1584902 A US 1584902A US 682310 A US682310 A US 682310A US 68231023 A US68231023 A US 68231023A US 1584902 A US1584902 A US 1584902A
- Authority
- US
- United States
- Prior art keywords
- pulp
- alkali
- fiber
- digesting
- liquor
- 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 description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 19
- 239000000835 fiber Substances 0.000 description 19
- 239000003513 alkali Substances 0.000 description 17
- 229910019142 PO4 Inorganic materials 0.000 description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 10
- 239000010452 phosphate Substances 0.000 description 10
- 235000021317 phosphate Nutrition 0.000 description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 9
- 235000013311 vegetables Nutrition 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 239000001488 sodium phosphate Substances 0.000 description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- 241000208202 Linaceae Species 0.000 description 2
- 235000004431 Linum usitatissimum Nutrition 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 235000010980 cellulose Nutrition 0.000 description 2
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical class [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000002025 wood fiber Substances 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
Definitions
- the liquor is commonly believed to contain a bi-sulfite or a sulfite of the base dissolved in free sulfurous acid with an excess of the acid present. Digestion with bi-sulfite liquor tends to weaken the fiber, particularly where flax or other straws are treated, and even in the digestion of wood fiber some of the cellulose is lost by the energetic action of the liquor.
- the digestin liquor commonly contains 15 to of tie alkali on the weight of the fiber treated in alkali. Ordinarily the pulp resulting from the alkali treatment is a soft open pulp used primarily for book paper.
- the digesting process of my invention whether soda or alkali may be carried out in substantially the well known manner.
- the phosphate is merely added to the liquor before or when the latter is charged into the digesters and the procedure is carried out according to the usual practice.
- the amount of phosphoric acid added may vary within wide limits, depending upon the material be- Application filed December as, 1923. Serial in. 682,310.
- a process of making pulp from vegetable fiber which consists in digesting same in a liquor containing a digesting agent and phosphoric acid.
- a process of making pulp from vegetable fiber which consists in digesting the same in a liquor containing a digesting agent and a soluble phosphate.
- a process for making pulp from vegetable fiber which consists in digesting the fiber in a liquor containing a digesting agent 1 and a sodium phosphate.
- a process of making pulp from vegetable fiber which consists in digesting the fiber in a solution containing any alkali and a phosphate soluble in the'presence of the W5 alkali.
- a process of making pulp from ve etable fiber which consists in digesting t e fiber in a liquor containing caustic alkali and a soluble phosphate. are
- a process for making pulp from vegetable fiber which consists in digesting the fiber in a liquor containin a digesting agent and from 1 to 4% of pfilosphorie acid in soluble form.
- a process of making paper pulp which consists in digesting fiber in a solution containing caustic alkali and 1 to 4% of sodium phosphate.
- a liquor for digesting vegetable fiber to form paper pulp comprising a digesting agent and a soluble phosphate.
- composition of matter a liquor for digesting vegetable fiber to form paper pulp comprising an alkali and a phosphate soluble in the presence of the alkali.
Landscapes
- Paper (AREA)
Description
Patented May Ed, ldzd.
unites star as tata @FFHQE.
BERTBAND S. SUMMERS, 01? PORT HURON, MIGHIL'GAN.
ART OF MAKING PULP FOR EALM.
Ito Drawing.
cium or magnesium or both. The liquor is commonly believed to contain a bi-sulfite or a sulfite of the base dissolved in free sulfurous acid with an excess of the acid present. Digestion with bi-sulfite liquor tends to weaken the fiber, particularly where flax or other straws are treated, and even in the digestion of wood fiber some of the cellulose is lost by the energetic action of the liquor. In the alkali process, which is more particularly used in the digestion of resinous woods which are not suitable to the sulfite process, the digestin liquor commonly contains 15 to of tie alkali on the weight of the fiber treated in alkali. Ordinarily the pulp resulting from the alkali treatment is a soft open pulp used primarily for book paper. 25 Where greater strength is desired in the product of the alkali process a mixture primarily of caustic soda and sulphide of soda, formed from salt cake or sulfate of soda'is employed, this form of the alkali process being known as the sulfate process. It produces a very strong pulp, but the latter has the disadvantage of being difficult to bleach and losing much of its strength during the bleaching operation.
I have found that when a suitable proportion of a soluble phosphate is added to the liquor whether acid or alkali better results are obtained, in the case of the sulfite liquor the weakening or devastating effect of the liquor on the fiber being greatly decreased and the yield of pulp increased, and in the case of the alkali process the resulting pulp is much stronger and may be bleached to give a rugged product, equaling in strength the strongest sulfite pulp.
Except for the addition of the phosphate the digesting process of my invention, whether soda or alkali may be carried out in substantially the well known manner. The phosphate is merely added to the liquor before or when the latter is charged into the digesters and the procedure is carried out according to the usual practice. The amount of phosphoric acid added may vary within wide limits, depending upon the material be- Application filed December as, 1923. Serial in. 682,310.
ing treated and the nature of the product desired, but I prefer to use between 1 and 4% of the weight of the fiber treated or a soluble phosphate (dry weight) such as sodium phosphate. I have successfully used, W however, as much as 10% phosphoric acid though ordinarily satisfactory results may be obtained within the narrower limits given, a stronger pulp resulting from the use of the higher percentage. In case trisodic M phosphate, which I prefer for the purpose,
is used in the alkali process the phosphoric acid remains combined with the base. In the use of the salt in the acid process a certain amount of free phosphoric acid results. 79 As the different mono-hydrogen, (ii-hydrogen and tri-hydrogen phosphates readily change one to another according to the acidity or basicity of the solution it is simply necessary to compute accordingly the amount of phosphoric acid required for the kind of pulp desired from the particular process employed. In the case of the more readily weakened fiber such as flax in which it is necessary to pulp the wood celluloses and the pectocelluloses at $9 the same time I have found it desirable to use somewhat larger amounts of phosphoric acid, it being possible to use materially more than 4% without injury to the product although in the alkali process the pulp tends 95 to'reach a harder state with less amounts of phosphoric acid than is the case with the acid process.
ll claim:
1. A process of making pulp from vegetable fiber which consists in digesting same in a liquor containing a digesting agent and phosphoric acid.
2. A process of making pulp from vegetable fiber which consists in digesting the same in a liquor containing a digesting agent and a soluble phosphate.
3. A process for making pulp from vegetable fiber which consists in digesting the fiber in a liquor containing a digesting agent 1 and a sodium phosphate.
4. A process of making pulp from vegetable fiber which consists in digesting the fiber in a solution containing any alkali and a phosphate soluble in the'presence of the W5 alkali. i
5. A process of making pulp from ve etable fiber which consists in digesting t e fiber in a liquor containing caustic alkali and a soluble phosphate. are
6. A process for making pulp from vegetable fiber which consists in digesting the fiber in a liquor containin a digesting agent and from 1 to 4% of pfilosphorie acid in soluble form.
7. A process of making paper pulp which consists in digesting fiber in a solution containing caustic alkali and 1 to 4% of sodium phosphate.
8. As a composition of matter a liquorfor digesting vegetable fiber for producing paper pulp comprising a digesting agent and phosphoric acid.
9. As a composition of matter, a liquor for digesting vegetable fiber to form paper pulp comprising a digesting agent and a soluble phosphate.
10. As a composition of matter a liquor for digesting vegetable fiber to form paper pulp comprising an alkali and a phosphate soluble in the presence of the alkali.
BERTRAND S. SUMMERS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US682310A US1584902A (en) | 1923-12-22 | 1923-12-22 | Art of making pulp for paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US682310A US1584902A (en) | 1923-12-22 | 1923-12-22 | Art of making pulp for paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1584902A true US1584902A (en) | 1926-05-18 |
Family
ID=24739130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US682310A Expired - Lifetime US1584902A (en) | 1923-12-22 | 1923-12-22 | Art of making pulp for paper |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1584902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2502330A (en) * | 1943-03-01 | 1950-03-28 | Clarence E Libby | Washing paper pulp to remove coloring matter |
-
1923
- 1923-12-22 US US682310A patent/US1584902A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2502330A (en) * | 1943-03-01 | 1950-03-28 | Clarence E Libby | Washing paper pulp to remove coloring matter |
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