US2007341A - Process of treating cellulose fibers - Google Patents

Process of treating cellulose fibers Download PDF

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Publication number
US2007341A
US2007341A US339732A US33973229A US2007341A US 2007341 A US2007341 A US 2007341A US 339732 A US339732 A US 339732A US 33973229 A US33973229 A US 33973229A US 2007341 A US2007341 A US 2007341A
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US
United States
Prior art keywords
fibers
pressure
cellulose
cellulose fibers
treating cellulose
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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
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US339732A
Inventor
Olsen Frederich
Frederick R Seavey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CELLULOSE RES CORP
CELLULOSE RESEARCH Corp
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CELLULOSE RES CORP
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Publication date
Application filed by CELLULOSE RES CORP filed Critical CELLULOSE RES CORP
Priority to US339732A priority Critical patent/US2007341A/en
Application granted granted Critical
Publication of US2007341A publication Critical patent/US2007341A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
    • C08B1/02—Rendering cellulose suitable for esterification

Definitions

  • This invention relates cellulose fibers.
  • nitrocellulose explosives In the preparation of nitrocellulose explosives,
  • the cellulose is nitrated in a bath of. nitric and sulphuric acid. When removed from the bath,
  • tubular fibers carrying both adherent or me.- chanically-held acid and adsorbedacid as well as other impurities must'be subjected to a purification treatment to remove, these unstable lower nitro bodies.
  • the principal object of this invention is the reduction-of the. fibers to a physical condition which will'be favorable for the action of the purifying or neutralizing agents.
  • This object is lar structure would be compressed or collapsed by the pressure fluid medium and, since the tube is not filled with the fluid, there can be no balancing of interior andexterior pressures pre-' liminary to the reduction of external pressure. It is, therefore, proposed to preparethe tubular fibers against collapse by filling them with a relatively incompressible fluid. ,This condition of the fibers may be produced by allowing them to become saturated with a liquid, conveniently trapped airirom the fibers by the application of a vacuum.
  • the fibers thus prepared are placed in a high pressure chamber and a fluid of high temperature such as steam is admitted to the chamber under a pressure of 500 to 1000 pounds per square inch and for varying from five seconds to a process of treating to one minute, depending upon the degree of physical disruption it is desired to secure.
  • a fluid of high temperature such as steam is admitted to the chamber under a pressure of 500 to 1000 pounds per square inch and for varying from five seconds to a process of treating to one minute, depending upon the degree of physical disruption it is desired to secure.
  • the process or producing cellulose pulp comprising providing cellulose in the form oiseparate tubular fibers, saturating said fibers with an incompressible liquid so as to fill said fibers withsaid' liquid, then. subjecting said fibers to high pressure and temperature, and then suddenly relieving said pressure to cause disruption t of said fibers by the vaporization of said liquid. and also optionally by removing the en- 6.
  • the process of producing cellulose pulp 7.
  • the process of producing cellulose -pulp then subjecting said fibers to high pressure and comprising providing cellulose in the form of sep-' temperature, and then suddenly relieving said arate tubular fibers. subjecting said fibers to appressure to cause disruption of said fibers by vaplication of a vacuum for removal or air, then porization 01 said liquid.

Description

Patented July 9, 1935 raocsss or v TREATING- CELLULOSE FIBE Fredrick Olsen'and Frederick R. Seavey, Dover,
N. .L, assignors to The Cellulose Research Corporation, a corporation of Delaware No Drawing. Application February 13, 1029,
1 Serial No. 339,732
'7 Claims.
(Filed but not issued under the act or Match 3, 1883, as amended April so, 1928; 370 0. G. 157) The invention described herein may-be manuiactured and used by us for the Government for governmental purposes, without the payment .to us of anyroyalty thereon. i
This inventionrelates cellulose fibers. In the preparation of nitrocellulose explosives,
the cellulose is nitrated in a bath of. nitric and sulphuric acid. When removed from the bath,
the tubular fibers carrying both adherent or me.- chanically-held acid and adsorbedacid as well as other impurities must'be subjected to a purification treatment to remove, these unstable lower nitro bodies.
The principal object of this invention is the reduction-of the. fibers to a physical condition which will'be favorable for the action of the purifying or neutralizing agents. This object is lar structure would be compressed or collapsed by the pressure fluid medium and, since the tube is not filled with the fluid, there can be no balancing of interior andexterior pressures pre-' liminary to the reduction of external pressure. It is, therefore, proposed to preparethe tubular fibers against collapse by filling them with a relatively incompressible fluid. ,This condition of the fibers may be produced by allowing them to become saturated with a liquid, conveniently trapped airirom the fibers by the application of a vacuum.
The fibers thus prepared are placed in a high pressure chamber and a fluid of high temperature such as steam is admitted to the chamber under a pressure of 500 to 1000 pounds per square inch and for varying from five seconds to a process of treating to one minute, depending upon the degree of physical disruption it is desired to secure. Upon suddenly relieving the pressure 'as by discharging the fibers through an opening in' the chamher, the fiuid in the fibers which has been heated bythe pressure medium is rapidly converted into steam causing disruption of the fibers.
Weclaim: 7, l 1. The step in the preparation of smokeless powder which consists in'filling each fiber of a mass of collapsible cellulose fibers with a re1a-' tively incompressible medium, subjecting them to a high temperature pressure fluid and suddenly releasing the pressure.
2. The step in the preparation of smokeless powder which consists in filling each fiber ot a mass of collapsible cellulose fibers with a supporting medium, subjecting them to a high temthe pressure.
,3. The step in the preparation of smokeless powder'which consists in placing the fibers 0! a mass of collapsible cellulose fibers in a non-collapsible condition, subjecting them to internal and external pressure and suddenly releasing the external pressure. 1
4. The step in the preparationpf smokeless powder which consists in fillingeach fiber of a mass of collapsible cellulose fibers with a medium ;'capable of suddenly changing its state and thereby producing a pressure within each fiber and ms) T TES: mini perature pressure fiuid and suddenly releasing- 7 then causing the medium to suddenly change its state whereby the fibers are disrupted.
5. The process or producing cellulose pulp comprising providing cellulose in the form oiseparate tubular fibers, saturating said fibers with an incompressible liquid so as to fill said fibers withsaid' liquid, then. subjecting said fibers to high pressure and temperature, and then suddenly relieving said pressure to cause disruption t of said fibers by the vaporization of said liquid. and also optionally by removing the en- 6. The process of producing cellulose pulp 7. The process of producing cellulose -pulp then subjecting said fibers to high pressure and comprising providing cellulose in the form of sep-' temperature, and then suddenly relieving said arate tubular fibers. subjecting said fibers to appressure to cause disruption of said fibers by vaplication of a vacuum for removal or air, then porization 01 said liquid.
5 saturating said fibers with an incompressible liq- FREDRICH OLSEN. B
uid so as to fill said fibers with said liquid, and FREDERICK R. BEAVEY.
US339732A 1929-02-13 1929-02-13 Process of treating cellulose fibers Expired - Lifetime US2007341A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610119A (en) * 1946-09-14 1952-09-09 Defibrator Ab Defibering presoaked ligno-cellulose
US2633421A (en) * 1947-10-23 1953-03-31 Elmer R Perkins Fiber liberation by steam expansion
US2640774A (en) * 1953-01-27 1953-06-02 Pulp And Papen Res Inst Of Can Production of cellulose pulp
US6059926A (en) * 1992-01-31 2000-05-09 Sharp Kabushiki Kaisha Method for manufacturing a paper diaphragm for a loud speaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610119A (en) * 1946-09-14 1952-09-09 Defibrator Ab Defibering presoaked ligno-cellulose
US2633421A (en) * 1947-10-23 1953-03-31 Elmer R Perkins Fiber liberation by steam expansion
US2640774A (en) * 1953-01-27 1953-06-02 Pulp And Papen Res Inst Of Can Production of cellulose pulp
US6059926A (en) * 1992-01-31 2000-05-09 Sharp Kabushiki Kaisha Method for manufacturing a paper diaphragm for a loud speaker

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