EP0783600A1 - Procede pour le transport de produits visqueux thermiquement instables - Google Patents
Procede pour le transport de produits visqueux thermiquement instablesInfo
- 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
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.
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)
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)
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 |
-
1995
- 1995-07-26 AT AT0127995A patent/AT402826B/de not_active IP Right Cessation
-
1996
- 1996-07-23 BR BR9606538A patent/BR9606538A/pt unknown
- 1996-07-23 JP JP50699597A patent/JPH10506969A/ja active Pending
- 1996-07-23 CA CA 2200689 patent/CA2200689A1/fr not_active Abandoned
- 1996-07-23 EP EP96923780A patent/EP0783600A1/fr not_active Ceased
- 1996-07-23 WO PCT/AT1996/000133 patent/WO1997005305A1/fr not_active Application Discontinuation
- 1996-07-23 CN CN96190815A patent/CN1077153C/zh not_active Expired - Fee Related
- 1996-07-23 AU AU64092/96A patent/AU6409296A/en not_active Abandoned
-
1997
- 1997-03-10 US US08/814,258 patent/US5794642A/en not_active Expired - Fee Related
- 1997-03-21 NO NO971345A patent/NO971345D0/no unknown
Non-Patent Citations (1)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19970322 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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AX | Request for extension of the european patent |
Free format text: AL PAYMENT 970322;LT PAYMENT 970322;LV PAYMENT 970322;SI PAYMENT 970322 |
|
17Q | First examination report despatched |
Effective date: 19970703 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20000717 |