WO2001087985A1 - Verfahren und vorrichtung zur behandlung von zellstoff mit harnstoff und ammoniak - Google Patents
Verfahren und vorrichtung zur behandlung von zellstoff mit harnstoff und ammoniak Download PDFInfo
- Publication number
- WO2001087985A1 WO2001087985A1 PCT/EP2001/005271 EP0105271W WO0187985A1 WO 2001087985 A1 WO2001087985 A1 WO 2001087985A1 EP 0105271 W EP0105271 W EP 0105271W WO 0187985 A1 WO0187985 A1 WO 0187985A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ammonia
- pulp
- urea
- container
- cellulose
- Prior art date
Links
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
-
- 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 present invention relates to a process for the treatment of pulp with urea and ammonia and a device which is particularly suitable for carrying out the process.
- ammonia treatment of cellulose is required to activate the cellulose in order to be able to carry out subsequent reaction steps, for example acetylation, more easily.
- an additive can be introduced into the pulp to simplify subsequent reaction steps.
- DE-A-4329937 describes a process for the treatment of cellulose for its activation for subsequent chemical reactions by contacting the cellulose with liquid ammonia at a pressure which is higher than atmospheric pressure.
- Ammonia is preferably used in an ammonia to pulp ratio of 6 to 10 mass units of ammonia to 10 mass units of pulp.
- the reaction with ammonia takes place in a pressure vessel. After a sufficient exposure time, ammonia is expelled by opening the pressure vessel and additional heating.
- EP-A-057105 describes a process for producing an alkali-soluble cellulose derivative.
- Cellulose is treated with liquid ammonia, the liquid ammonia containing dissolved urea.
- the process comprises grinding an alkali treated and acetic acid neutralized cellulose with urea in a large amount of ammonia for 3 to 6 hours. Molar ratios of urea to cellulose of 0.5 to 3 are used. The amount of ammonia used corresponds to about 5 to 10 times, based on the weight, the amount of cellulose.
- WO-A-9947567 discloses a dosing method for mixtures of ammonia and an additive. A mixture of liquid ammonia and at least one additive is first prepared and this mixture is then added to a solid to be treated.
- the prior art methods require a relatively long contact time to achieve sufficient saturation of the pulp with the mixture of ammonia and urea. This undesirably increases the time of manufacturing the pulp / urea mixture, which in turn leads to increased costs. At the same time, the cost of the necessary equipment is high.
- crushed pulp materials i.e. shredded or ground pulp samples are used to achieve sufficient penetration of the pulp with the mixture of ammonia and urea.
- pulp plates or cellulose webs directly with the mixture of ammonia and urea it is desirable not only to be able to treat pulp or pulp, but also pulp plates or cellulose webs directly with the mixture of ammonia and urea.
- the object on which the invention is based is therefore to provide a process for treating pulp with urea and ammonia in which the amount of ammonia and / or urea used can be minimized, as a result of which expensive equipment and costs can be saved. Furthermore, the method is also intended for the treatment of cellulose boards and / or cellulose webs be suitable. At the same time, the pulp should be impregnated as homogeneously as possible. Another object on which the invention is based is to provide a device with which, in particular, the method according to the invention can be carried out.
- the present invention provides a device for treating pulp with urea and ammonia, comprising a pressure vessel and at least one application system provided therein.
- FIG. 1 and 2 show exemplary embodiments of the device according to the invention.
- the reference symbols denote the following elements:
- FIG. 1 shows a side view (section) of a device according to the invention for treating plate pulp.
- FIG. 2 shows a side view (section) of an apparatus according to the invention for the treatment of pulp.
- FIG. 3 and FIG. 4 show preferred application systems of the invention.
- Figure 3 shows a pair of rollers (8,9) and
- Figure 4 shows a pair of spray nozzles (8a, 9a).
- pulp as used in the present application encompasses the fine-fiber mass obtained from the digestion of wood or other plant fibers and which consists predominantly of cellulose , and the pulp types named after the pulping process used or the raw materials used, such as sulfate, nitrate and soda pulp as well as softwood, hardwood and straw pulp.
- the pulp to be treated according to the method according to the invention is preferably in the form of pulp plates, webs or rolls.
- the weight ratio of ammonia to pulp is preferably 0.3 to 0.95: 1, particularly preferably 0.5 to 0.9: 1.
- the molar ratio of urea to pulp is preferably 0.1 to 0.95: 1, particularly preferably 0.5 to 0.9: 1.
- the process according to the invention is preferably carried out in an ammonia atmosphere.
- An ammonia pressure of 5 to 25 bar is particularly preferred.
- the method according to the invention will be carried out in a pressure vessel. Such containers are known to the person skilled in the art.
- the treatment of pulp with ammonia and urea is preferably carried out using an ammonia urea solution.
- This solution preferably has a concentration of less than 99% of the saturation concentration, particularly preferably of less than 95% of the saturation concentration, based on the saturation concentration of urea in ammonia.
- the lower limit is preferably 10% of the saturation concentration.
- the process is preferably carried out at a temperature of 0 to 100 ° C, more preferably 5 to 60 ° C.
- the process according to the invention is characterized in that, owing to the reduced amount of urea and ammonia, it is possible to carry out the process economically without great operational expenditure.
- the present invention further enables the treatment of cellulose plates and / or cellulose webs, as a result of which expensive comminution steps can be avoided before the cellulose is loaded with ammonia and urea, and the treatment apparatus is considerably smaller and therefore less expensive.
- the ammonia and urea are preferably applied in the form of a solution to the cellulose plates, webs or rolls to be treated using the device according to the invention at least one application system, as shown in Figure 1 or 2.
- the method according to the invention is preferably designed in the treatment of pulp plates, webs or rolls so that the last treated pulp plate or the last treated part of a pulp roll or web still runs for 0.5 to after passing through the application system according to the invention 30 minutes, preferably 1 to 10 Minutes in the ammonia atmosphere. This ensures that the ammonia-urea mixture is evenly and homogeneously present in the interior of the material for the pulp material last treated.
- Excess ammonia can be removed after the treatment according to the invention.
- the treating pulp can be heated, a flushing gas flow can be used or a negative pressure can be applied.
- a flushing gas flow can be used or a negative pressure can be applied.
- the device according to the invention comprises at least one pressure vessel.
- Such containers are known to the person skilled in the art.
- the device according to the invention comprises at least one application system.
- Preferred examples of application systems according to the invention are a pair of rollers (8,9) and a pair of spray nozzles (8a, 9a).
- the device according to the invention comprises at least one application system, preferably one to three application systems, particularly preferably one application system.
- the application systems can be the same or different.
- a feed area that is optionally funnel-shaped can be provided. This ensures better guidance of the pulp materials to be treated before they run through the application system.
- the device according to the invention particularly preferably comprises one or two pairs of rollers (9, 8) as application systems.
- the special designs of such rollers are known to the person skilled in the art e.g. known from the paper coating.
- the rollers of the application systems described above can also be equipped to move the materials to be carried out, for example by hydraulic drives.
- the device can also comprise a separate device for moving the materials to be carried through. Examples of these are a roller conveyor (14), preferably with hydraulically operated rollers, and a conveyor belt. If the material to be carried out is in the form of a rolled-up web (13a), for example, the separate device for locomotion can be designed as a coil (15) provided behind the application system. The web of material is clamped into this and guided through the application system by a simple rotary movement.
- the device according to the invention preferably also comprises a metering pump system (6, 7) with which, for example, an ammonia urea solution can be transported to the application system.
- a metering pump system (6, 7) with which, for example, an ammonia urea solution can be transported to the application system.
- metering pump systems are known to the person skilled in the art.
- Preferred devices essentially consist of three cylindrical pressure vessels (1, 3, 5) which are connected to one another by shut-off devices (2, 4).
- Shut-off device (2) is optional.
- the shut-off devices are preferably designed as wedge-type slide valves.
- Container (1) serves as a template for the pulp to be treated
- container (3) contains the application system
- container (5) is the storage for the treated pulp.
- the container (3) preferably has a heater (16) in order to be able to make pressure or temperature settings. This heating is preferably designed as a half-pipe heating.
- a locomotion device (14) runs, preferably a roller conveyor, the rollers of which e.g. are hydraulically driven.
- the pressure vessels are preferably made of stainless steel VZA 1.4571 or similar materials.
- the at least one application system is located in the container (3).
- the application system is preferably designed as a pair of rollers (8, 9) or a pair of spray nozzles (8a, 9a). This system preferably comprises at least one pair of application rollers (8, 9).
- Dosing pumps (6, 7) are also provided in the container (3). The special design of such metering pumps is known to the person skilled in the art.
- the container (5) contains a storage device (14a) or a winding device (spool) (14) for the reception of cellulose materials.
- Container (5) is further connected to a heating circuit (20). This includes a
- Containers (1) and (5) are further connected to a circuit (21). This includes a
- the container (3) is further connected to the inlet (17) and outlet (18), which
- the device of the present invention is particularly suitable for carrying out the method according to the invention.
- the presence of the at least one application system results in an exact metering of the ammonia and the urea as well as a good penetration of the pulp to be treated with the ammonia / urea mixture.
- the device according to the invention in particular also allows the treatment of cellulose plates and / or cellulose webs with ammonia and urea.
- the course of the treatment of pulp with ammonia and urea when using plate or roll pulp using a device according to the invention is preferably as follows.
- the container (3) is isolated by the slides (2) and (4) and is under an ammonia atmosphere. In the sump (19) of container (3) there is an ammonia urea solution (in equilibrium with the ammonia atmosphere).
- the metering pumps (6) and (7) like the associated circuits, are filled with ammonia urea solution.
- the containers (1) and (5) are depressurized and filled with air.
- Container (5) is closed, container (1) is open.
- the cellulose plates are placed in container (1) and then closed the container.
- Now containers (1) and (5) with ammonia vapor from the circuit (21) are steamed up to the equilibrium pressure of container (3).
- Sliders (2) and (4) are opened.
- a sheet feed system preferably hydraulically driven, transports the sheets to the application rollers (8) and (9).
- the ammonia urea solution is applied to the pulp on both sides.
- the amount to be applied is set via the roller diameter and the metered amount of the pumps (6) and (7), depending on the throughput speed.
- the sheets are then deposited in container (5) on the depositing device (15a).
- the slides (2) and (4) are closed.
- the container (5) is either heated and / or evacuated for drying.
- the container (1) is evacuated and the ammonia is re-liquefied via the circuit (21). It is then rinsed with air; then the container can be opened again and loaded.
- the container (5) After drying, the container (5) is brought to ambient pressure, a substantial part of the ammonia already evaporating. Then the heating circuit (20) is opened, and the fan (11) sucks the remaining ammonia from the container (5) and conveys it back to the heat exchanger (12), where it is heated to approx. 30 to 70 ° C Container (5) where the ammonia remaining in the pulp is expelled with the warm ammonia vapor. If the pulp has dried to the desired residual ammonia content, the heating circuit (20) is switched off and shut off. Then container (5) is completely evacuated, if necessary the pulp can be kept under vacuum for a further minute to about 1 hour for post-degassing. Then it is rinsed briefly with air, after which the treated pulp can be removed.
- the entire system is empty and depressurized, the slide (4) is open.
- the pulp roll (13a) is hooked into the container (1), threaded and passed through the container (3) into the container (5) and struck there for winding into the bobbin (15).
- the facility will sealed and misted with gaseous ammonia.
- the sump (19) from the container (3) is then filled with ammonia urea solution via the inlet (17).
- the pumps (6) and (7) start up and the pulp band is drawn evenly through the application rollers (8,9).
- the dosage is as described for the plate pulp. If the pulp is wound up after the container (5), the slide (4) is closed and the sump (19) from the container (3) is emptied through the outlet (18) and the pump circuits.
- containers (1) and (3) are evacuated, purged with air and are ready for loading again.
- drying and degassing are carried out analogously to the treatment of cellulose plates.
- an application system with spray nozzles (8a, 9a) which spray the urea to be applied, for example in the form of a solution, onto the cellulose.
- the nozzles can be provided both above and below the pulp to be treated.
- the pulp materials to be treated are passed between the application systems designed, for example, as a pair of rollers (8,9) or as a pair of spray nozzles (8a, 9a).
- the ammonia and urea are then applied to the pulp via the application system. If the application system comprises a pair of rollers, for example, the ammonia and the urea can be applied to the pulp by transferring these substances from the rollers to the pulp as they pass through the pair of rollers.
- the inventive method designed in this way causes the pulp to penetrate with the ammonia and urea.
- the application system comprises a pair of rollers, the rollers, when passing between them, ensure that ammonia and urea are applied evenly to the pulp to be treated in a thin film.
- the ammonia-urea solution then penetrates the pulp plates. This ensures good and homogeneous penetration. This results in an excellent intercalation, which leads to a largely homogeneous and, above all, complete conversion to carbamate in a subsequent reaction. Due to the uniform implementation, it is achieved that a readily soluble and easily processable product is obtained.
- the metering of the amount of ammonia and urea to be applied can be carried out when carrying out the method according to the invention by means of the device according to the invention by regulating the metering pumps (6, 7), the throughput speed of the cellulose plates (13) or webs and / or the speed of the application rollers (8, 9).
- the devices and control techniques required for this are known to the person skilled in the art.
- the treated pulp sheets, webs or rolls can be freed from excess ammonia after the treatment with ammonia and urea by the methods already described above. Then they can either be processed directly or stored or transported.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU70514/01A AU7051401A (en) | 2000-05-15 | 2001-05-09 | Method and device for treating cellulose with urea and ammonia |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10023753.3 | 2000-05-15 | ||
DE2000123753 DE10023753A1 (de) | 2000-05-15 | 2000-05-15 | Verfahren und Vorrichtung zur Behandlung von Zellstoff mit Harnstoff und Ammoniak |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001087985A1 true WO2001087985A1 (de) | 2001-11-22 |
Family
ID=7642109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/005271 WO2001087985A1 (de) | 2000-05-15 | 2001-05-09 | Verfahren und vorrichtung zur behandlung von zellstoff mit harnstoff und ammoniak |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN1179978C (de) |
AU (1) | AU7051401A (de) |
DE (1) | DE10023753A1 (de) |
WO (1) | WO2001087985A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD201908A5 (de) * | 1981-01-27 | 1983-08-17 | Nestle Oy | Verfahren zur herstellung einer alkali-loeslichen cellulose-verbindung |
US5037663A (en) * | 1981-10-14 | 1991-08-06 | Colorado State University Research Foundation | Process for increasing the reactivity of cellulose-containing materials |
DE19628277A1 (de) * | 1996-07-12 | 1998-01-15 | Rhodia Ag Rhone Poulenc | Verfahren zur Aktivierung eines Cellulose und Harnstoff enthaltenden Gemisches |
DE19835688A1 (de) * | 1998-08-07 | 2000-02-10 | Piesteritz Stickstoff | Verfahren zur Herstellung von Cellulosecarbamat |
-
2000
- 2000-05-15 DE DE2000123753 patent/DE10023753A1/de not_active Ceased
-
2001
- 2001-05-09 CN CNB018095887A patent/CN1179978C/zh not_active Expired - Fee Related
- 2001-05-09 WO PCT/EP2001/005271 patent/WO2001087985A1/de active Application Filing
- 2001-05-09 AU AU70514/01A patent/AU7051401A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD201908A5 (de) * | 1981-01-27 | 1983-08-17 | Nestle Oy | Verfahren zur herstellung einer alkali-loeslichen cellulose-verbindung |
US5037663A (en) * | 1981-10-14 | 1991-08-06 | Colorado State University Research Foundation | Process for increasing the reactivity of cellulose-containing materials |
DE19628277A1 (de) * | 1996-07-12 | 1998-01-15 | Rhodia Ag Rhone Poulenc | Verfahren zur Aktivierung eines Cellulose und Harnstoff enthaltenden Gemisches |
DE19835688A1 (de) * | 1998-08-07 | 2000-02-10 | Piesteritz Stickstoff | Verfahren zur Herstellung von Cellulosecarbamat |
Also Published As
Publication number | Publication date |
---|---|
CN1179978C (zh) | 2004-12-15 |
DE10023753A1 (de) | 2001-11-29 |
CN1429236A (zh) | 2003-07-09 |
AU7051401A (en) | 2001-11-26 |
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