US714216A - Bleaching paper-pulp. - Google Patents
Bleaching paper-pulp. Download PDFInfo
- Publication number
- US714216A US714216A US11658202A US1902116582A US714216A US 714216 A US714216 A US 714216A US 11658202 A US11658202 A US 11658202A US 1902116582 A US1902116582 A US 1902116582A US 714216 A US714216 A US 714216A
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- Prior art keywords
- pulp
- vessel
- bleaching
- air
- vessels
- 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.)
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- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
Definitions
- the object of my invention is to effect the process with a minimum of bleaching agent and with less expenditure of power; and to that end it consists in subjecting the pulp in admixture with the bleaching agent within a closed vessel or vessels to pressure above at mospheric pressure of air or other innocuous gas or of a gas or gaseous mixture having in itself suitable bleaching properties, whereby the reagents employed or the vapors arising from them are prevented from escaping into the atmosphere and are forced into the fiber of the material or caused to more effectually act upon it.
- the pulp may be agitated within the closed vessel or vessels; but by preference thorough admixture is obtained by transference'of the material from one vessel to another through connecting-pipes provided with stop-cocks, such transference being efiected by the pressure of the air or gas, which may force the material back and forth through these pipes from a full vessel to an empty one.
- the bleaching agent employed is gaseous, it may be forced through the material until the desired pressure is obtained.
- This apparatus comprises a number of fluidtight drums or vessels 0, 0., whose lower ends are contracted and connected at a to a common inlet and'discharge pipe b, fitted with cocks or valves 0.
- An air or gas compressor dis provided to charge a large air vessel 6, which is connected by a pipe f, having branches f furnished with cocks connected to each vessel a.
- Another pipe g, connected to the vessels a, serves to discharge these vessels either to the atmosphere at g or to the air-compressor d, as shown.
- the pulp mixed with the bleaching agent is delivered into one or more of the vessels a through the inlet 1) or valve 0.
- the valve oryalves c is or are closed, and air above atmospheric pressure is forced through the pipes f f into the vessel a, the air-pressure being maintained throughout the bleaching process.
- valves 0 of any two of the vessels a may be opened, so that by the air-pressure the contents of one vessel are forced through the bottom end of the vessel (1 and upward into an adjoining vessel a, whereby the pulp is agitated and more effectually mixed with the bleach and air or gas.
- the air or gas from the air vessel e is then applied under pressure to the vessel or, to which the pulp has been transferred.
- the transference of the pulp may be effected from vessel to vessel throughout the series, and finally the pulp is discharged into a vat h.
- the process of bleaching paper-pulp which consists'in subjecting the pulp in admixture with a bleaching agent to pressure of air or gas, above atmospheric pressure, within a closed vessel or vessels and mixing or agitating the material by transference from one vessel to another by means of gaseous pressure.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Description
No. 714,216. Patenid Nov. 25, I902.
' n. c. manzuas.
BLEAGHING PAPER PULP.
(Application filed July 22, 1902-) (No Model.)
UNITED STATES PATENT OFFICE.
ROBERT CHARLES MENZIES, OF MUSSELBURGH, SCOTLAND.
BLEACHING PAPER-PU LP.
SPECIFIGATION forming part of Letters Patent No. 714,216, dated November 25, 1902. Application filed July 22, 1902- Serial No. 116,582. (No specimens.)
."0 at whom, it may concern.-
Be it known that I, ROBERT CHARLES MEN- ZIES, a subject of the King of the United Kingdom of Great Britain and Ireland, residing at Inveresk Paper Mills, Musselburgh, county of Edinburgh, Scotland, have invented certain new and useful Improvements in Bleaching Paper-Pulp or Like Material, (for which application for patent has been made in Great Britain, No. 28, dated January 1, 1902,) of which the following is a specification.
In bleaching paper-pulp in open vessels the bleaching agents employed are commonly in large measure dissipated in fumes or vapor, and a consequently larger portion must be used than is requisite to effect the bleaching process. Moreover, considerable power is expended in the mechanical operation of mixing or incorporating the bleach with the pulp, especially as carried on in breaking-engines or hollanders or like machines.
The object of my invention is to effect the process with a minimum of bleaching agent and with less expenditure of power; and to that end it consists in subjecting the pulp in admixture with the bleaching agent within a closed vessel or vessels to pressure above at mospheric pressure of air or other innocuous gas or of a gas or gaseous mixture having in itself suitable bleaching properties, whereby the reagents employed or the vapors arising from them are prevented from escaping into the atmosphere and are forced into the fiber of the material or caused to more effectually act upon it. During the bleaching process the pulp may be agitated within the closed vessel or vessels; but by preference thorough admixture is obtained by transference'of the material from one vessel to another through connecting-pipes provided with stop-cocks, such transference being efiected by the pressure of the air or gas, which may force the material back and forth through these pipes from a full vessel to an empty one. When the bleaching agent employed is gaseous, it may be forced through the material until the desired pressure is obtained.
The accompanying drawings illustrate in plan at Figure 1 and in elevation at Fig. 2 an arrangement of apparatus suitable for carrying out the bleaching process.
This apparatus comprises a number of fluidtight drums or vessels 0, 0., whose lower ends are contracted and connected at a to a common inlet and'discharge pipe b, fitted with cocks or valves 0. An air or gas compressor dis provided to charge a large air vessel 6, which is connected by a pipe f, having branches f furnished with cocks connected to each vessel a. Another pipe g, connected to the vessels a, serves to discharge these vessels either to the atmosphere at g or to the air-compressor d, as shown.
In carrying out the process the pulp mixed with the bleaching agent is delivered into one or more of the vessels a through the inlet 1) or valve 0. The valve oryalves c is or are closed, and air above atmospheric pressure is forced through the pipes f f into the vessel a, the air-pressure being maintained throughout the bleaching process. v
During the progress of the bleaching operation the valves 0 of any two of the vessels a may be opened, so that by the air-pressure the contents of one vessel are forced through the bottom end of the vessel (1 and upward into an adjoining vessel a, whereby the pulp is agitated and more effectually mixed with the bleach and air or gas. The air or gas from the air vessel e is then applied under pressure to the vessel or, to which the pulp has been transferred.
The transference of the pulp may be effected from vessel to vessel throughout the series, and finally the pulp is discharged into a vat h.
Having now described my invention, what I claim, and desire to secure by Letters Patent, is
The process of bleaching paper-pulp which consists'in subjecting the pulp in admixture with a bleaching agent to pressure of air or gas, above atmospheric pressure, within a closed vessel or vessels and mixing or agitating the material by transference from one vessel to another by means of gaseous pressure.
In witness whereof I have hereunto set my hand in presence of two witnesses.
ROBERT CHARLES MENZIES.
Witnesses:
WALLACE FAIRWEATHER, WALLACE ORANs'roN FAIRWEATHER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11658202A US714216A (en) | 1902-07-22 | 1902-07-22 | Bleaching paper-pulp. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11658202A US714216A (en) | 1902-07-22 | 1902-07-22 | Bleaching paper-pulp. |
Publications (1)
Publication Number | Publication Date |
---|---|
US714216A true US714216A (en) | 1902-11-25 |
Family
ID=2782738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11658202A Expired - Lifetime US714216A (en) | 1902-07-22 | 1902-07-22 | Bleaching paper-pulp. |
Country Status (1)
Country | Link |
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US (1) | US714216A (en) |
-
1902
- 1902-07-22 US US11658202A patent/US714216A/en not_active Expired - Lifetime
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