CN106546067B - Low-temperature integrated drying method for replacing bacterial cellulose gel film - Google Patents
Low-temperature integrated drying method for replacing bacterial cellulose gel film Download PDFInfo
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Abstract
The invention provides a method for performing replacement and low-temperature integrated drying on a bacterial cellulose gel film, which mainly comprises the following steps: the device comprises a drying tank (1) and a displacing agent storage tank (2), wherein an air outlet (3) with a valve is arranged at the upper part of the drying tank (1), a water outlet (4) with a valve and a displacing agent inlet (5) are arranged at the lower part of the drying tank (1), an electric heating device (6) and a removable middle shaft lever (7) are arranged at the middle shaft of the drying tank; the upper part of the displacing agent storage tank (2) is provided with a displacing agent recovery inlet (8), the lower part of the displacing agent storage tank (2) is provided with a displacing agent outlet (9), the air outlet (3) with a valve at the upper part of the drying tank (1) is connected with the displacing agent recovery inlet (8) at the upper part of the displacing agent storage tank (2) through a conduit, and the displacing agent inlet (5) at the lower part of the drying tank (1) is connected with the displacing agent outlet (9) at the lower part of the displacing agent storage tank (2) through a conduit.
Description
Technical Field
The invention relates to a material drying system and method, in particular to a bacterial cellulose gel film replacement low-temperature integrated drying system and method.
Background
Bacterial cellulose is a biomaterial synthesized by metabolism of some microorganisms, which has a similar basic structure as natural cellulose, but has many unique properties, for example, excellent mechanical properties, high biocompatibility, good biodegradability, etc., since it does not contain lignin, hemicellulose, etc. associated products, and has a crystallinity as high as 95% or more and a high degree of polymerization as high as 2000-8000. It has wide application prospect in a plurality of technical fields. At present, bacterial cellulose is mainly subjected to static fermentation culture by a liquid culture medium to obtain a bacterial cellulose gel film with very high water content. However, in an increasing number of applications, it is desirable to use dry bacterial cellulose films that are substantially free of water. The conventional drying methods mainly comprise hot air drying, freeze drying and the like, but the high temperature and freezing inevitably affect the spatial network structure of the bacterial cellulose, so that many physical and chemical characteristics of the bacterial cellulose membrane, such as porosity, mechanical properties, conductivity and the like, are affected. The supercritical drying technology which has been developed in recent years can maintain the space network structure of the bacterial cellulose to the maximum extent, but the cost is high, the requirement on equipment is high, and the technology is still in a laboratory stage and cannot be applied industrially on a large scale.
Disclosure of Invention
The invention provides a system and a method for performing replacement and low-temperature integrated drying on a bacterial cellulose gel film, which mainly comprise the following steps: the device comprises a drying tank, a displacing agent storage tank, an electric heating device and a water outlet, wherein the upper part of the drying tank is provided with an air outlet with a valve, the lower part of the drying tank is provided with a water outlet with a valve, a displacing agent inlet and a detachable middle shaft rod, and the middle shaft of the drying tank is provided with the electric heating device; the upper part of the displacing agent storage tank is provided with a displacing agent recovery inlet, the lower part of the displacing agent storage tank is provided with a displacing agent outlet, the air outlet with a valve at the upper part of the drying tank is connected with the displacing agent recovery inlet at the upper part of the displacing agent storage tank through a conduit, and the displacing agent inlet at the lower part of the drying tank is connected with the displacing agent outlet at the lower part of the displacing agent storage tank through a conduit.
In the system, the side wall of the drying tank 1 is also provided with a transparent observation window for observing the position of the liquid level. Preferably it extends to the bottom of the drying tank.
In the system, the electric heating device is controlled by the temperature sensor and the temperature control device, and the temperature sensor measures the temperature in the drying tank to control whether the heating device is started.
In the system, an air outlet with a valve at the upper part of the drying tank is connected with a displacing agent recycling inlet at the upper part of the displacing agent storage tank through a condenser and a conduit.
In the system, a displacer inlet at the lower part of the drying tank is connected with a displacer outlet at the lower part of the displacer storage tank through a pump and a conduit. The pump is reversible.
According to the replacement low-temperature integrated drying system and method provided by the invention, the water in the bacterial cellulose gel film can be replaced by the replacement agent through the replacement drying technology, and then the replacement agent is removed from the bacterial cellulose film through the low-temperature drying technology. The replacement drying is completely carried out at normal temperature, and the low-temperature drying is only carried out at 50-60 ℃ according to the type of the replacement agent, so that the damage of high temperature or freezing to the space network structure of the bacterial cellulose membrane can be avoided, and various performances of the dried bacterial cellulose membrane can be improved. In addition, the replacement low-temperature drying system and the replacement low-temperature drying method provided by the invention can also enable replacement drying and low-temperature drying to be integrally carried out in the same tank body, do not need a plurality of devices, transfer bacterial cellulose materials for a plurality of times, can also recycle a replacement agent, are low in cost and simple to operate, and have good application prospects.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure:
1-drying in a tank; 2-a displacer storage tank; 3-an air outlet with a valve; 4-water outlet with valve; 5-a displacer inlet; 6-an electric heating device; 7-a central shaft; 8-a displacer recovery inlet; 9-a displacer outlet; 10-a transparent viewing window; 11-a temperature sensor; 12-temperature control means; 13-a condenser; 14-Pump.
Detailed Description
The invention is further elucidated below with reference to the drawing. In the following detailed description, the invention is described by way of illustration only, and not by way of limitation. Those skilled in the art will be able to modify the detailed description to follow in various ways without departing from the spirit and scope of the invention, and it is intended to be within the scope of the invention.
As shown in figure 1, the system and the method for replacing low-temperature integrated drying of the bacterial cellulose gel film comprise a drying tank 1 and a displacer storage tank 2, wherein an air outlet 3 with a valve is arranged at the upper part of the drying tank 1, a water outlet 4 with a valve and a displacer inlet 5 are arranged at the lower part of the drying tank 1, and an electric heating device 6 is arranged, the electric heating device 6 is controlled by a temperature sensor 11 and a temperature control device 12, and the temperature sensor 11 measures the temperature in the drying tank 1 to control whether the heating device 6 is started. A removable middle shaft lever 7 is arranged at the middle shaft of the drying tank, and after the removable middle shaft lever is removed, the bacterial cellulose gel film containing water is wound on the middle shaft lever and then is installed back into the drying tank; the upper part of the displacer storage tank 2 is provided with a displacer recovery inlet 8, the lower part of the displacer storage tank 2 is provided with a displacer outlet 9, the air outlet 3 with a valve at the upper part of the drying tank 1 is connected with the displacer recovery inlet 8 at the upper part of the displacer storage tank 2 through a condenser 13, and the displacer inlet 5 at the lower part of the drying tank 1 is connected with the displacer outlet 9 at the lower part of the displacer storage tank 2 through a pump 14. The side wall of the drying tank 1 is also provided with a transparent observation window 10 extending to the bottom of the drying tank for observing the position of the liquid level.
The replacement low-temperature integrated drying system and the method have the working modes as follows:
firstly, taking down a central shaft 7 in a drying tank 1, winding a water-containing bacterial cellulose gel film on the central shaft 7, then installing the central shaft back into the drying tank 1, closing an air outlet 3 at the upper part of the drying tank and a water outlet 4 at the lower part of the drying tank, opening a displacing agent inlet 5, then pumping a displacing agent in a displacing agent storage tank 2 into the drying tank 1 through a pump 14 until the liquid level of the displacing agent in the drying tank is higher than that of the bacterial cellulose gel film roll (observing the liquid level through a transparent observation window), stopping pumping the displacing agent, closing the displacing agent inlet 5, and standing for solvent displacement drying. The displacing agent enters the bacterial cellulose gel film to displace the water in the bacterial cellulose gel film, and the displacing agent is lighter than water, so that the liquid in the drying tank can be layered, the lower layer is water, and the upper layer is the displacing agent. After the displacement drying is finished, a water outlet 4 at the lower part of the drying tank 1 is opened to discharge wastewater, after the wastewater is discharged (the discharged liquid can be observed to contain a displacing agent or observe the liquid level change through a transparent observation window), the water outlet 4 is closed, a displacing agent inlet 5 is opened, the remaining displacing agent in the drying tank is pumped into a displacing agent storage tank 2, and the displacing agent inlet 5 is closed after the completion. And opening an air outlet 3 at the upper part of the drying tank, starting the electric heating device, controlling the temperature in the drying tank to be slightly higher than the boiling point of the displacing agent through a temperature sensor and a temperature control device, evaporating the displacing agent from the air outlet 3 in a changed gas state, condensing the gas through a condenser 13, and refluxing the gas into a displacing agent storage tank 2.
Claims (7)
1. A method for replacing and drying bacterial cellulose gel film at low temperature is characterized in that: a replacement low-temperature integrated drying system is adopted for drying, the replacement low-temperature integrated drying system is composed of a drying tank (1) and a displacing agent storage tank (2), an air outlet (3) with a valve is arranged at the upper part of the drying tank (1), a water outlet (4) with a valve and a displacing agent inlet (5) are arranged at the lower part of the drying tank (1), an electric heating device (6) is arranged, and a removable middle shaft rod (7) is arranged at the middle shaft of the drying tank; a displacing agent recovery inlet (8) is formed in the upper part of the displacing agent storage tank (2), a displacing agent outlet (9) is formed in the lower part of the displacing agent storage tank (2), an air outlet (3) with a valve in the upper part of the drying tank (1) is connected with the displacing agent recovery inlet (8) in the upper part of the displacing agent storage tank (2) through a guide pipe, and a displacing agent inlet (5) in the lower part of the drying tank (1) is connected with the displacing agent outlet (9) in the lower part of the displacing agent storage tank (2) through a guide pipe; the drying method comprises the following steps: firstly, taking down a middle shaft rod (7) in a drying tank (1), winding a water-containing bacterial cellulose gel film on the middle shaft rod (7), then installing the middle shaft rod back into the drying tank (1), sealing an air outlet (3) at the upper part and a water outlet (4) at the lower part of the drying tank, opening a displacer inlet (5), then pumping a displacer in a displacer storage tank (2) into the drying tank (1), stopping pumping the displacer and closing the displacer inlet (5) when the liquid level of the displacer in the drying tank is higher than that of the bacterial cellulose gel film roll, and standing for solvent displacement drying; after the displacement drying is finished, opening a water outlet (4) at the lower part of the drying tank (1) to discharge wastewater, closing the water outlet (4) after the wastewater is discharged, opening a displacing agent inlet (5), pumping the residual displacing agent in the drying tank into a displacing agent storage tank (2), and closing the displacing agent inlet (5) after the completion of the displacement drying; and opening the air outlet (3) at the upper part of the drying tank, starting the electric heating device (6), controlling the temperature in the drying tank to be slightly higher than the boiling point of the displacing agent, evaporating the displacing agent from the air outlet (3) to be changed into gas, condensing, and refluxing to the displacing agent storage tank (2).
2. The bacterial cellulose gel film displacement low-temperature drying method according to claim 1, characterized in that: the side wall of the drying tank (1) is also provided with a transparent observation window (10) through which the liquid level of the displacing agent is observed.
3. The bacterial cellulose gel film displacement low-temperature drying method according to claim 2, characterized in that: the transparent viewing window (10) extends to the bottom of the drying tank.
4. The bacterial cellulose gel film displacement cryodrying method according to any one of claims 1 to 3, characterized in that: the electric heating device (6) is controlled by a temperature sensor (11) and a temperature control device (12).
5. The bacterial cellulose gel film displacement cryodrying method according to any one of claims 1 to 3, characterized in that: an air outlet (3) with a valve at the upper part of the drying tank (1) is connected with a displacing agent recovery inlet (8) at the upper part of the displacing agent storage tank (2) through a condenser (13) and a conduit, and the displacing agent is evaporated, condensed through the condenser (13) and then refluxed into the displacing agent storage tank (2).
6. The bacterial cellulose gel film displacement low-temperature drying method according to claim 5, characterized in that: the displacer inlet (5) at the lower part of the drying tank (1) is connected with the displacer outlet (9) at the lower part of the displacer storage tank (2) through a pump (14) and a conduit.
7. The bacterial cellulose gel film displacement low-temperature drying method according to claim 6, characterized in that: the pump (14) is reversible.
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| CN107930543B (en) * | 2017-12-28 | 2023-08-11 | 乐山职业技术学院 | Device and method for solvent replacement and normal-pressure drying for preparing aerogel |
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