EP0783600A1 - Procede pour le transport de produits visqueux thermiquement instables - Google Patents

Procede pour le transport de produits visqueux thermiquement instables

Info

Publication number
EP0783600A1
EP0783600A1 EP96923780A EP96923780A EP0783600A1 EP 0783600 A1 EP0783600 A1 EP 0783600A1 EP 96923780 A EP96923780 A EP 96923780A EP 96923780 A EP96923780 A EP 96923780A EP 0783600 A1 EP0783600 A1 EP 0783600A1
Authority
EP
European Patent Office
Prior art keywords
streams
partial streams
mass
partial
cellulose
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.)
Ceased
Application number
EP96923780A
Other languages
German (de)
English (en)
Inventor
Stefan Zikeli
Michael Longin
Friedrich Ecker
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.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lenzing AG, Chemiefaser Lenzing AG filed Critical Lenzing AG
Publication of EP0783600A1 publication Critical patent/EP0783600A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/06—Feeding liquid to the spinning head
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0324—With control of flow by a condition or characteristic of a fluid
    • Y10T137/0329—Mixing of plural fluids of diverse characteristics or conditions
    • Y10T137/0335—Controlled by consistency of mixture
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0391—Affecting flow by the addition of material or energy
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85938—Non-valved flow dividers

Definitions

  • the invention relates to a method for transporting thermally unstable, viscous masses.
  • the present invention relates in particular to a method for transporting a molding or spinning mass which contains cellulose and an aqueous tertiary amine oxide.
  • molding and spinning mass is used for any viscous mass which contains cellulose and an aqueous tertiary amine oxide and which can be processed into cellulosic moldings of any kind, in particular fibers and films.
  • NMMO N-methylmorpholine-N-oxide
  • Tertiary amine oxides offer an advantage as alternative solvents in that, in contrast to the viscose process, the NMMO dissolves the cellulose in a non-derivatizing manner, which means that the cellulose does not have to be regenerated chemically, the NMMO remains chemically unchanged and passes into the precipitation bath when it is precipitated and is recovered from it and can be reused for a new solution preparation.
  • the NMMO process thus opens up the possibility of one closed solvent cycle.
  • NMMO has extremely low toxicity.
  • Amine oxides also generally have only limited thermal stability, which varies depending on the structure.
  • the NMMO monohydrate is present under normal conditions as a white crystalline solid that melts at 72 ° C. However, the anhydro compound only melts at 172 ° C. When the monohydrate is heated, a strong discoloration occurs from 120/130 "C. An exothermic reaction is triggered from 175 ° C with complete drainage of the melt and violent gas evolution with an explosive course, with temperatures reaching well above 250 ° C.
  • the present invention comes in and aims to provide a method for transporting thermally unstable, viscous compositions, in particular a method for transporting a molding or spinning composition which contains cellulose and an aqueous tertiary amine oxide, which does not have the above problems.
  • the inventive method for transporting a thermally unstable, viscous mass through pipes is characterized in that
  • WO 94/28208 From WO 94/28208 it is known to transport a solution of cellulose in NMMO through a branch valve, with which the solution is optionally directed to one of two filters. In normal operation, a filter is always in the "stand-by" position. In order to be able to maintain continuous operation during a filter change, the other filter is put into operation during the time of the filter change. Furthermore, it is mentioned that the solution can be divided into two streams and transported to two filters by an intermediate position of the branch valve. However, the person skilled in the art cannot see from WO 94/28208 that the cellulose solutions are to be transported at the same speed and that this enables the molded articles to have a constant quality.
  • static mixers can also be used to compensate for any differences in temperature and viscosity that may be present in the mass.
  • the best way to ensure that the speed of the split is not reduced due to the volume reduction is to reduce the pipe diameter. This creates a uniform speed profile, which is particularly advantageous with regard to the same dwell time.
  • a preferred embodiment of the method according to the invention consists in that the X. partial streams T. are further divided into X 2 partial streams T ", X_ being derived from the relationship
  • X “partial streams T” are further divided into X_ partial streams T-, where X 3 is derived from the relationship
  • Each of the partial streams T 3 can be divided at least one more time.
  • Q preferably denotes the number 2.
  • Q in relationships (I), (II) and (III) means different integers.
  • N preferably denotes an integer between 2 and 12, preferably between 5 and 10.
  • a preferred embodiment of the method according to the invention is that the same amount of viscous mass is transported per unit of time in each of the X. partial flows T-, in each of the X partial flows ⁇ _ and in each of the X_ partial flows T_.
  • the inventive method is particularly well suited to transport a solution of cellulose in an aqueous tertiary amine oxide, wherein the cellulose solution divided best fl in X partial streams and becomes X molding tools, in particular spinnerettes, transported.
  • the pipe element consists of a cross piece 1, in which the mass flow is divided into two equal partial flows.
  • the mass is supplied or the partial flows are expediently carried out by means of conveying means, such as Pump. If highly viscous masses are conveyed, as is the case in the NMMO system, the conveyance is carried out by forced conveying bodies, e.g. Gear pumps etc. Between the cross pieces, various internals, such as Mixers, heat exchangers and pumps can be provided.
  • the crosspiece 1 is attached in a conventional manner to a feed line 3 via a flange 2.
  • a seal 4 is provided between the feed line 3 and the cross piece 1.
  • the cross piece 1 is at its derivatives 5a and 5b via flanges 6a and 6b Counter flanges 7a and 7b of leads 8a and 8b attached. Seals 9a and 9b are provided between the flanges 6a, 6b and 7a, 7b.
  • a jacket 10 is provided for a heating medium or a cooling medium, with which the temperature of the flowing, viscous mass can be set and controlled.
  • Such heating jackets are also provided in the counter flanges 7a, 7b of the leads 5a and 5b and in the flange of the feed line 3.
  • Water, steam or thermal oil can be used as the heating medium.
  • Water or thermal oil can be used as the cooling medium.
  • the mass flow can be divided into further partial flows, 4, 8, 16, 32 etc. partial streams being formed according to the invention, depending on the number of crosspieces used.
  • the number Q is 2 in the above mathematical relationship.
  • Q means different numbers for the divisions, for example the number 2 for some of the divisions and the number 3 for the remaining divisions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pipeline Systems (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

L'invention a pour objet un procédé pour le transport, au travers de conduites, d'un produit visqueux thermiquement instable, caractérisé en ce que (a) le produit est divisé, durant le transport, en X1 courants partiels T1, X1 étant calculé à partir de la relation (I) X1 = Q(N-1), dans laquelle Q et N désignent, indépendamment l'un de l'autre, des nombres entiers positifs, et en ce que (b) le produit visqueux est transporté à la même vitesse dans les courants partiels.
EP96923780A 1995-07-26 1996-07-23 Procede pour le transport de produits visqueux thermiquement instables Ceased EP0783600A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT0127995A AT402826B (de) 1995-07-26 1995-07-26 Verfahren zum transportieren thermisch instabiler, viskoser massen
AT1279/95 1995-07-26
PCT/AT1996/000133 WO1997005305A1 (fr) 1995-07-26 1996-07-23 Procede pour le transport de produits visqueux thermiquement instables
US08/814,258 US5794642A (en) 1995-07-26 1997-03-10 Process for transporting thermally unstable viscous masses

Publications (1)

Publication Number Publication Date
EP0783600A1 true EP0783600A1 (fr) 1997-07-16

Family

ID=25595406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96923780A Ceased EP0783600A1 (fr) 1995-07-26 1996-07-23 Procede pour le transport de produits visqueux thermiquement instables

Country Status (10)

Country Link
US (1) US5794642A (fr)
EP (1) EP0783600A1 (fr)
JP (1) JPH10506969A (fr)
CN (1) CN1077153C (fr)
AT (1) AT402826B (fr)
AU (1) AU6409296A (fr)
BR (1) BR9606538A (fr)
CA (1) CA2200689A1 (fr)
NO (1) NO971345D0 (fr)
WO (1) WO1997005305A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8151885B2 (en) * 2009-04-20 2012-04-10 Halliburton Energy Services Inc. Erosion resistant flow connector
RU2599396C2 (ru) 2010-12-30 2016-10-10 Юнайтед Стэйтс Джипсум Компани Распределительная система для суспензии и способ
US10076853B2 (en) 2010-12-30 2018-09-18 United States Gypsum Company Slurry distributor, system, and method for using same
US9999989B2 (en) 2010-12-30 2018-06-19 United States Gypsum Company Slurry distributor with a profiling mechanism, system, and method for using same
US9616591B2 (en) 2010-12-30 2017-04-11 United States Gypsum Company Slurry distributor, system and method for using same
US9296124B2 (en) 2010-12-30 2016-03-29 United States Gypsum Company Slurry distributor with a wiping mechanism, system, and method for using same
CN103857499B (zh) * 2011-10-24 2016-12-14 美国石膏公司 用于浆料分配的多腿排出靴
AR088521A1 (es) 2011-10-24 2014-06-18 United States Gypsum Co Divisor de flujo para un sistema de distribucion de lechada
US10293522B2 (en) 2011-10-24 2019-05-21 United States Gypsum Company Multi-piece mold and method of making slurry distributor
US10059033B2 (en) 2014-02-18 2018-08-28 United States Gypsum Company Cementitious slurry mixing and dispensing system with pulser assembly and method for using same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179181A (en) * 1936-04-21 1939-11-07 Soc Of Chemical Ind Cellulose solutions and process of making same
DE1156967B (de) * 1959-10-15 1963-11-07 Luigi Cogliati Spritzkopf zum Herstellen von Platten oder Folien
NL301581A (fr) * 1962-12-17
GB1012501A (en) * 1963-03-22 1965-12-08 British Nylon Spinners Ltd Improvements in or relating to the distribution of viscous liquid substances in pipes
US3381336A (en) * 1966-06-20 1968-05-07 Stanley C. Wells Melt spinning extrusion head system
IT941066B (it) * 1971-06-19 1973-03-01 Jenne S R L Cella modulare per la filatura di fibre sintetiche
US4256140A (en) * 1979-12-06 1981-03-17 The Continental Group, Inc. Two-piece hot runner manifold
US4881566A (en) * 1988-10-11 1989-11-21 Conoco Inc. Method for reducing pressure drop in the transportation of drag reducer
US5010910A (en) * 1990-05-21 1991-04-30 Mobil Oil Corporation Steam distribution manifold
US5040558A (en) * 1990-10-31 1991-08-20 Mobil Oil Corporation Low thermal stress steam distribution manifold
AT396930B (de) * 1992-01-23 1993-12-27 Chemiefaser Lenzing Ag Aminoxide
US5395516A (en) * 1993-05-28 1995-03-07 Courtaulds Fibres (Holdings) Limited Filtration system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9705305A1 *

Also Published As

Publication number Publication date
BR9606538A (pt) 1998-06-23
ATA127995A (de) 1997-01-15
NO971345L (no) 1997-03-21
CA2200689A1 (fr) 1997-02-13
US5794642A (en) 1998-08-18
NO971345D0 (no) 1997-03-21
CN1077153C (zh) 2002-01-02
WO1997005305A1 (fr) 1997-02-13
CN1159215A (zh) 1997-09-10
JPH10506969A (ja) 1998-07-07
AT402826B (de) 1997-09-25
AU6409296A (en) 1997-02-26

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