EP1071719A1 - Procede de dosage d'un melange constitue d'un ammoniac liquide et d'un additif amene a un solide, et dispositif de dosage - Google Patents

Procede de dosage d'un melange constitue d'un ammoniac liquide et d'un additif amene a un solide, et dispositif de dosage

Info

Publication number
EP1071719A1
EP1071719A1 EP99914489A EP99914489A EP1071719A1 EP 1071719 A1 EP1071719 A1 EP 1071719A1 EP 99914489 A EP99914489 A EP 99914489A EP 99914489 A EP99914489 A EP 99914489A EP 1071719 A1 EP1071719 A1 EP 1071719A1
Authority
EP
European Patent Office
Prior art keywords
additive
solid
ammonia
batch
container
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.)
Withdrawn
Application number
EP99914489A
Other languages
German (de)
English (en)
Inventor
Ties Karstens
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.)
Cerdia Produktions GmbH
Original Assignee
Rhodia Acetow GmbH
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 Rhodia Acetow GmbH filed Critical Rhodia Acetow GmbH
Publication of EP1071719A1 publication Critical patent/EP1071719A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/22—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/05—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur
    • C08B15/06—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur containing nitrogen, e.g. carbamates

Definitions

  • the invention relates to a dosing method in which an ammonia / additive system comprises a solid, e.g. Cellu-less, metered is supplied, as well as a device that is particularly suitable for performing the method.
  • an ammonia / additive system comprises a solid, e.g. Cellu-less, metered is supplied, as well as a device that is particularly suitable for performing the method.
  • Ammomak treatment of solids, in particular polysaccharides, has proven advantageous in terms of the accessibility and reactivity of the substances treated in this way, e.g. can be found in DE 196 11 416.
  • the urea can also first be thoroughly mixed with cellulose as a solid in comminuted form before treatment with liquid ammonia, but only a relatively non-uniform distribution of the additive in the solid can be achieved.
  • an ammonia / additive system in which an ammonia / additive system is metered into a solid, a) at least one additive and b) liquid ammomac are provided, c) the liquid ammonia is mixed with the at least one additive, and d) this ammonia / The additive system is then brought into contact with a solid, steps a) to c) being carried out at least twice, but with a time delay, so that the ammonia additive system is continuously made available for forwarding to the solid.
  • the process according to the invention has the considerable advantage that, despite the fact that the individual mixing and reaction processes generally run without a continuous flow of material, surprisingly, due to the at least two processes of mixing ammonia and additive (step c)) which take place at different times for the action of the ammonia / additive system (step d)) on the solid an almost continuous provision of this system is achieved.
  • the - 3 - it is advantageously possible with the - 3 - to supply liquid ammonia under pressure to a solid in whatever form substances which, on the one hand, are homogeneously distributed in the liquid ammonia due to their solubility or easy dispersibility, and on the other hand, due to the rapid and uniform diffusion of the liquid ammonia under pressure distribute the ammonia homogeneously in the treated solid.
  • the additives are soluble or dispersible in the liquefied ammonia in order to achieve a homogeneous distribution in the solid to be treated with the liquefied ammonia.
  • the device according to the invention it is advantageously possible to perform a quasi-continuous process for the treatment of a solid with a solution or a mixture of a liquid or solid additive dissolved or dispersed in liquid Ammomak at room temperature or at a higher temperature or corresponding mixtures thereof perform in a metered manner.
  • step c) generation (step c)) of the amount of the ammonia / additive system required for the action in step c) can be adapted to the quantitative ratios in step d). The production rate can thereby be increased further.
  • the additive can be added to the batch containers or to a part of the batch containers with a time delay or alternately.
  • the Ammomak can also be supplied to the batch containers or to a part of the batch containers with a time delay or alternately in order to further increase the production rate or the temporal yield of the amount of solid / additive system.
  • a plurality of batch containers are preferably used to carry out step c) and the respective amount of ammonia / additive system can then alternately be supplied in turn from one of the batch containers from a pressure reactor for carrying out step d) in order to carry out quasi-continuous operation.
  • the mixing in step c) can be carried out in only one of the batch containers simultaneously with step d).
  • the pressure is suddenly or explosively reduced, preferably by at least 5 bar, in particular by about 15 to 30 bar, in order to obtain a homogeneous yield.
  • a polysaccharide in particular starch, inulin, chitin or
  • Alginic acid or a heteroglycan, in particular a galactomannan or guar gum, or cellulose or wood chips can be used.
  • a heteroglycan in particular a galactomannan or guar gum, or cellulose or wood chips can be used.
  • Urea As an additive e.g. Urea and as a solid cellulose can be used.
  • ethylene carbonate can be used as a solid additive and ethylene glycol can be used as a liquid additive.
  • the additives are soluble or dispersible in the liquefied ammonia in order to achieve a homogeneous distribution of the liquefied ammonia in the solid to be treated. - 5 -
  • the device according to the invention according to claim 25 comprises at least one storage container for a solid additive or a liquid additive, at least one batch container, which is connected to the storage container for the additive and a source of liquid ammomac, for mixing added ammonia and additive to form an ammonia / Additive system, at least one reactor device which is connected to the batch container and a source of solid and has a chamber in which the ammonia / additive system supplied from the at least one batch container comes into contact with the supplied solid during a treatment phase, to produce a solid / ammonia / additive system and a control device which controls the distribution and treatment of the substances in the device in such a way that the ammonia / additive system is continuously shared for forwarding to the solid.
  • the device according to the invention it is advantageously possible to perform a quasi-continuous process for the treatment of a solid with a solution or a mixture of a liquid or solid additive dissolved or dispersed in liquid ammonia at room temperature or at a higher temperature or corresponding mixtures thereof in exactly perform in a metered manner.
  • FIG. 1 It shows: - 6 -
  • Figure 1 is a schematic view of an embodiment of the device according to the invention.
  • At least one storage container 10, 12 for solid or liquid additives are made using suitable conveying devices, e.g. a screw conveyor 20, a conveyor belt (not shown), pipelines 34 and pumps 22 conveyed into the batch container 14, 16.
  • suitable conveying devices e.g. a screw conveyor 20, a conveyor belt (not shown), pipelines 34 and pumps 22 conveyed into the batch container 14, 16.
  • a left-hand or right-hand screw conveyor 20 is provided for the solid additives and a pipe branch 36 with a high-pressure pump 22 is provided for the liquid additives.
  • the storage containers 10, 12 are each provided with a measuring device or balance 18 with which the metering of a preset amount of additive into one of the batch containers 14, 16 is controlled.
  • the batch container 14, 16 to be filled is in a depressurized state, the lower valve 38 being closed and the upper valve 40 being open.
  • Valves are preferably ball valves. After the amount of additive has been metered in, the upper valve 40 of the batch container 14, 16 is closed and the amount of liquid ammonium atom required for the desired concentration and the NH3 / solids ratio desired in a chamber 43 of a reactor device 32 is metered in via the addition 24. If necessary, the in
  • the ammonia / additive system is heated to the temperature prevailing in the chamber 43 by means of a heating device 30 before it is supplied to the solids in the chamber 43 by means of a high-pressure pump 22.
  • a quasi-continuous operation under the control of a computer-based control device can be realized with a clocked driving style.
  • the control device monitors and controls the function of all valves, conveying means, batch containers and the reactor device.
  • Flushing of the pipelines can also be omitted, since ammonia under pressure, i.e. has only a very low viscosity at temperatures above the boiling point.
  • the pumps can be omitted under certain circumstances, since the flow of the ammonia solution or suspension under the respective pressure from the batch container 14, 16 into the chamber 43 of the reactor device for treating the
  • Solid is effected. It is also possible to coordinate the flow rates of liquid ammonia and of ammonia solution or dispersion in accordance with an ammonia / additive system so that the NH3 / solids ratio remains constant, but the proportions of the flow rates can vary from task to task.
  • the device can be arranged anywhere between the ammonia tank as the ammonia source and the pressure reactor (s) or chamber (s) 43 of the reactor device (s) 32.
  • the dosing system can be adapted to any technical NH3 treatment system that can be implemented.
  • the reactor device 32 has at least one chamber 43 which is connected to the ammonia source and the batch containers 14 and 16 and to which the solid is fed from a solid source (not shown).
  • a further chamber (not shown) is arranged downstream of the chamber 43.
  • the chamber 43 is with a
  • the ammonia / additive system supplied alternately by the batch containers 14 and 16 is brought into contact with the supplied solid in order to produce a solid / ammonia / additive system under high pressure.
  • the valve 42 which has a large opening, is opened and the solid / ammonia / additive system relaxes suddenly or explosively in the further chamber in order to produce the solid / additive system separately from the now gaseous Ammomak.
  • the control device clocks the device in such a way that, during a treatment phase in the chamber 43 of the reactor device 32, a corresponding amount of ammonia / additive system is again mixed in one of the batch containers 14, 16.
  • Solubility in 20.8 38.8 51.8 62.8 68.0 73.2 75.9 79.3 84.8 91.1% by weight
  • the solution composed as mentioned above is pumped with the aid of an ammonia high-pressure pump into a pressure reactor which has already been preheated to 70 ° C. and contains 2000 g of pulp in pre-comminuted form (torn). After closing the upper ball valve and after a short exposure time (30 seconds), the ball valve to the expansion tank is opened, which triggers the quick tension. In the meantime, the urea solution described above was prepared in liquid ammonia in the second batch container. Immediately after the explosion, the pressure reactor was refilled with the specified amount of 2000 g of pre-shredded pulp. After the urea solution has been dosed in liquid ammonia by the high-pressure pump and the exposure time, the next explosion occurs, etc. After a number of 20 NH3 explosions
  • Heating and cooling a batch container
  • the container at the start of filling is not too high.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

L'invention concerne un procédé de dosage selon lequel un système ammoniac/additif est amené, de façon dosée, à un solide. Selon ledit procédé de dosage, a) au moins un additif et b) de l'ammoniac liquide sont préparés, et c) l'ammoniac liquide est mélangé avec le ou les additifs, d) ce système ammoniac/additif étant ensuite mis en contact avec un solide. Les étapes a) à c) sont exécutées, respectivement, au moins deux fois, cependant avec un décalage temporel, de telle sorte que le système ammoniac/additif est mis à disposition en continu pour être transporté vers le solide. En outre, l'invention concerne un dispositif qui est particulièrement adapté au procédé selon l'invention.
EP99914489A 1998-03-13 1999-03-08 Procede de dosage d'un melange constitue d'un ammoniac liquide et d'un additif amene a un solide, et dispositif de dosage Withdrawn EP1071719A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19810740 1998-03-13
DE19810740A DE19810740A1 (de) 1998-03-13 1998-03-13 Verfahren zur Dosierung eines Ammoniak/Zusatzstoff-Systems in einen Feststoff und Dosiervorrichtung
PCT/EP1999/001483 WO1999047567A1 (fr) 1998-03-13 1999-03-08 Procede de dosage d'un melange constitue d'un ammoniac liquide et d'un additif amene a un solide, et dispositif de dosage

Publications (1)

Publication Number Publication Date
EP1071719A1 true EP1071719A1 (fr) 2001-01-31

Family

ID=7860639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99914489A Withdrawn EP1071719A1 (fr) 1998-03-13 1999-03-08 Procede de dosage d'un melange constitue d'un ammoniac liquide et d'un additif amene a un solide, et dispositif de dosage

Country Status (5)

Country Link
EP (1) EP1071719A1 (fr)
AU (1) AU3329099A (fr)
DE (1) DE19810740A1 (fr)
WO (1) WO1999047567A1 (fr)
ZA (1) ZA991464B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MXPA00008875A (es) 1998-03-13 2002-04-24 Rhodia Acetow Gmbh Aparato proceso y reactor a presion para el tratamiento de solidos con gases liquidos presurizados.
DE10223171A1 (de) * 2002-05-24 2003-12-11 Zimmer Ag Verfahren zur Herstellung von Cellulosecarbamat
CN104568098B (zh) * 2015-01-16 2016-09-14 厦门帮众科技有限公司 一种快速预热的精确计量装置
JP7062421B2 (ja) * 2017-12-07 2022-05-06 Ｐａｃｒａｆｔ株式会社 混合物充填装置及び混合物充填方法
CN109723618A (zh) * 2018-12-28 2019-05-07 四川金象赛瑞化工股份有限公司 尿素泵的在线备用方法、应用和系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI62318C (fi) * 1981-01-27 1982-12-10 Neste Oy Foerfarande foer framstaellning av ett alkaliloesligt cellulosaderivat
RU2151435C1 (ru) * 1994-09-12 2000-06-20 Коммодоре Лабораториес, Инкорпорейтед Способ очистки загрязненных почв, содержащих вредные вещества
KR100254840B1 (ko) * 1995-03-25 2000-05-01 힌젠 라이문트 폴리사카라이드의 활성화 방법, 이 방법으로 제조된 폴리사카라이드 및 이의 용도

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9947567A1 *

Also Published As

Publication number Publication date
AU3329099A (en) 1999-10-11
WO1999047567A1 (fr) 1999-09-23
DE19810740A1 (de) 1999-09-16
ZA991464B (en) 1999-08-24

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