Device and method for controlling evaporation capacity of deacidification liquid solvent

Abstract

The invention provides a device and a method for controlling the evaporation capacity of a deacidification solution solvent, and belongs to the technical field of literature protection. According to the device provided by the invention, the refrigerant pipeline, the heat exchanger and the temperature sensor are arranged in the deacidification liquid output pipeline, deacidification liquid with higher temperature passes through the heat exchanger under the action of the output circulating pump, the refrigerant pipeline is arranged on the heat exchanger, and a refrigerant with lower temperature exists in the refrigerant pipeline; the temperature of the deacidification liquid can be obviously reduced under the refrigerant exchange action, so that the low-temperature deacidification liquid is formed, the temperature sensor can transmit the temperature of the low-temperature deacidification liquid to the temperature control center, the flow of the refrigerant in the refrigerant pipeline is regulated and controlled according to the temperature of the low-temperature deacidification liquid, and then the temperature of the low-temperature deacidification liquid is controlled. The temperature of the deacidification liquid reaches the required temperature, so that the solvent evaporation capacity of batch literatures in the negative-pressure impregnation process is reduced, the pressure of solvent recovery of the deacidification liquid is reduced, and the concentration of the deacidification liquid in the impregnation process is effectively stabilized.

Description

Technical Field

[0001] The invention relates to the technical field of document protection, in particular to a device for controlling the evaporation amount of a deacidification liquid solvent and a method for controlling the evaporation amount of a deacidification liquid solvent. Background Art

[0002] During the negative pressure impregnation deacidification process of batch paper documents, the deacidification solution is always in a boiling state during the document impregnation process because the environmental pressure during the impregnation is lower than the saturated vapor pressure of the deacidification solution solvent. A large amount of evaporated deacidification solution solvent leaves the impregnation tank with the exhaust of the impregnation system. The experiment shows that when the impregnation environmental pressure is 5×10 3 KPa, when the temperature of the deacidification liquid is at 25℃, the evaporation rate of the deacidification liquid solvent is 4.5Kg / min·M 2 .

[0003] The large amount of evaporation of the deacidification solution solvent not only affects the liquid level of the document immersion, but also affects the concentration of the deacidification solution, and at the same time increases the difficulty of recovering the deacidification solution solvent.

[0004] Therefore, how to reduce the evaporation amount of the deacidification solution solvent during the negative pressure immersion deacidification process of batch paper documents has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The object of the present invention is to provide a device for controlling the evaporation amount of the deacidification liquid solvent and a method for controlling the evaporation amount of the deacidification liquid solvent. The device provided by the present invention can reduce the temperature of the deacidification liquid to a temperature corresponding to the immersion pressure point at which the solvent vapor pressure is lower than the immersion pressure point under the same negative pressure immersion conditions, thereby effectively reducing the evaporation consumption of the deacidification liquid solvent.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The invention provides a device for controlling the evaporation amount of deacidification liquid solvent, comprising a heat exchanger, a refrigerant pipeline and a temperature sensor; the refrigerant pipeline is connected to the heat exchanger, and the temperature sensor is arranged behind the outlet of the heat exchanger.

[0008] Preferably, the refrigerant pipeline passes through the interior of the heat exchanger.

[0009] Preferably, the device for controlling the evaporation amount of the deacidification liquid solvent comprises a deacidification liquid storage tank, a deacidification liquid output pipeline, a refrigerant pipeline, a heat exchanger, a temperature sensor, an immersion tank and a deacidification liquid input pipeline;

[0010] The outlet of the deacidification liquid storage tank is connected to the inlet of the immersion tank through a deacidification liquid output pipeline;

[0011] The inlet of the deacidification liquid storage tank is connected to the outlet of the immersion tank through a deacidification liquid input pipeline;

[0012] A heat exchanger is arranged in the deacidification liquid output pipeline.

[0013] Preferably, the device for controlling the evaporation amount of the deacidification liquid solvent further comprises an output circulation pump.

[0014] Preferably, the output circulation pump is arranged at one end of the deacidification liquid output pipeline close to the deacidification liquid storage tank.

[0015] Preferably, the top of the immersion tank is provided with an immersion tank air inlet and an immersion tank exhaust port.

[0016] Preferably, a batch of paper documents are placed inside the immersion tank.

[0017] Preferably, the device for controlling the evaporation amount of the deacidification liquid solvent further comprises an input circulation pump.

[0018] Preferably, the input circulation pump is arranged in the deacidification liquid input pipeline.

[0019] The present invention provides a method for controlling the evaporation amount of a deacidification liquid solvent, and uses the device for controlling the evaporation amount of a deacidification liquid solvent described in the above technical solution to carry out a negative pressure immersion deacidification process for batches of paper documents.

[0020] The present invention provides a device for controlling the evaporation amount of deacidification liquid solvent, comprising a heat exchanger, a refrigerant pipeline and a temperature sensor; the refrigerant pipeline is connected to the heat exchanger, and the temperature sensor is arranged behind the outlet of the heat exchanger. The device provided by the present invention arranges the refrigerant pipeline, the heat exchanger and the temperature sensor in the deacidification liquid output pipeline. Under the action of the output circulation pump, the deacidification liquid with a higher temperature passes through the heat exchanger, and the heat exchanger is provided with a refrigerant pipeline. There is a refrigerant with a lower temperature in the refrigerant pipeline. Under the action of the refrigerant exchange, the temperature of the deacidification liquid can be significantly reduced, thereby forming a low-temperature deacidification liquid. The temperature sensor can transmit the temperature of the low-temperature deacidification liquid to the temperature control center, thereby regulating the flow of the refrigerant in the refrigerant pipeline according to the temperature of the low-temperature deacidification liquid, and then controlling the temperature of the low-temperature deacidification liquid to reach the required temperature, thereby reducing the solvent evaporation amount of the batch documents in the negative pressure impregnation process, reducing the pressure of the deacidification liquid solvent recovery, and effectively stabilizing the concentration of the deacidification liquid in the impregnation process. The results of the embodiment show that after using the device provided by the present invention, under the same negative pressure impregnation conditions, the temperature of the deacidification liquid can be reduced to a temperature corresponding to the solvent vapor pressure being lower than the impregnation pressure point, which can effectively reduce the evaporation consumption of the deacidification liquid solvent, is beneficial to stabilizing the concentration of the deacidification liquid, and is beneficial to improving the stability of the quality of negative pressure impregnation deacidification of batch documents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a device for controlling the evaporation amount of a deacidification liquid solvent provided by the present invention;

[0022] In the figure, 1 is a deacidification liquid storage tank, 2 is an output circulation pump, 3 is a deacidification liquid output pipeline, 4 is a refrigerant pipeline, 5 is a heat exchanger, 6 is a temperature sensor, 7 is an immersion tank air inlet, 8 is an immersion tank exhaust port, 9 is an immersion tank, 10 is a batch of paper documents, 11 is a deacidification liquid input pipeline, and 12 is an input circulation pump;

[0023] Figure 2 A temperature feedback control logic diagram of a device for controlling the evaporation amount of a deacidification liquid solvent provided by the present invention;

[0024] Figure 3 This is the vapor pressure-temperature characteristic curve of fluorinated liquid DA-308. DETAILED DESCRIPTION

[0025] The invention provides a device for controlling the evaporation amount of deacidification liquid solvent, comprising a heat exchanger, a refrigerant pipeline and a temperature sensor; the refrigerant pipeline is connected to the heat exchanger, and the temperature sensor is arranged behind the outlet of the heat exchanger.

[0026] As an embodiment of the present invention, the refrigerant pipeline passes through the interior of the heat exchanger. In the present invention, by arranging a refrigerant pipeline on the heat exchanger, the deacidification liquid can be cooled down by the refrigerant exchange when passing through the heat exchanger to form a low-temperature deacidification liquid, thereby reducing the evaporation amount of the deacidification liquid.

[0027] In the present invention, the temperature sensor is arranged behind the heat exchanger outlet. By arranging the temperature sensor, the present invention can detect the temperature of the deacidification liquid after cooling, thereby facilitating the reduction of the evaporation consumption of the deacidification liquid solvent and improving the stability of the quality of the negative pressure impregnation deacidification of batch documents.

[0028] As an embodiment of the present invention, the temperature sensor is also connected to a temperature control center. The present invention has no special limitation on the specific model and source of the temperature control center. It is sufficient to use equipment familiar to those skilled in the art to control the flow rate of the refrigerant in the refrigerant pipeline according to the temperature of the deacidification liquid. The present invention can obtain the temperature of the deacidification liquid after cooling by arranging a temperature sensor at the outlet of the heat exchanger and feed it back to the temperature control center. The flow rate of the refrigerant in the refrigerant pipeline is regulated according to the set temperature requirements to achieve low-temperature control of the deacidification liquid.

[0029] like Figure 1 As shown, as an embodiment of the present invention, the device for controlling the evaporation amount of the deacidification liquid solvent includes a deacidification liquid storage tank 1, an output circulation pump 2, a deacidification liquid output pipeline 3, a refrigerant pipeline 4, a heat exchanger 5, a temperature sensor 6, an immersion tank air inlet 7, an immersion tank exhaust port 8, an immersion tank 9, a batch of paper documents 10, a deacidification liquid input pipeline 11 and an input circulation pump 12.

[0030] like Figure 1As shown, as an embodiment of the present invention, the outlet of the deacidification liquid storage tank is connected to the inlet of the immersion tank through a deacidification liquid output pipeline. In the present invention, the deacidification liquid in the deacidification liquid storage tank is transported to the immersion tank through the deacidification liquid output pipeline.

[0031] like Figure 1 As shown, as an embodiment of the present invention, the output circulation pump is arranged at one end of the deacidification liquid output pipeline close to the deacidification liquid storage tank. The present invention transports the deacidification liquid in the deacidification liquid storage tank to the immersion tank through the output circulation pump.

[0032] like Figure 1 As shown, as an embodiment of the present invention, a heat exchanger is provided in the deacidification liquid output pipeline.

[0033] like Figure 1 As shown, as an embodiment of the present invention, the heat exchanger is arranged between the output circulation pump and the immersion tank.

[0034] like Figure 1 As shown, as an embodiment of the present invention, the refrigerant pipeline is connected to the heat exchanger. As an embodiment of the present invention, the refrigerant pipeline passes through the inside of the heat exchanger. The present invention can better reduce the temperature of the deacidification liquid and improve the sensing accuracy of the temperature sensor to the deacidification liquid temperature by arranging the heat exchanger, the refrigerant pipeline and the temperature sensor inside the deacidification liquid output pipeline.

[0035] like Figure 1 As shown, as an embodiment of the present invention, a temperature sensor is provided in the deacidification liquid output pipeline between the heat exchanger and the immersion tank.

[0036] like Figure 1 As shown, as an embodiment of the present invention, the top of the immersion tank is provided with an immersion tank air inlet and an immersion tank exhaust port. The present invention can regulate the gas in the immersion tank by providing the immersion tank air inlet and the immersion tank exhaust port.

[0037] like Figure 1 As shown, as an embodiment of the present invention, a batch of paper documents are placed in the immersion tank. The present invention uses a deacidifying solution in the immersion tank to process the batch of paper documents.

[0038] like Figure 1 As shown, as an embodiment of the present invention, the inlet of the deacidification liquid storage tank is connected to the outlet of the immersion tank through a deacidification liquid input pipeline. In the present invention, the treated high-temperature deacidification liquid is transported to the deacidification liquid storage tank through the deacidification liquid input pipeline, and then cooled by a heat exchanger before being reused.

[0039] like Figure 1As shown, as an embodiment of the present invention, an input circulation pump is arranged in the deacidification liquid input pipeline. The present invention transports the deacidification liquid in the immersion tank to the deacidification liquid storage tank through the input circulation pump.

[0040] The temperature feedback control logic diagram of the device for controlling the evaporation amount of the deacidification liquid solvent provided by the present invention is as follows: Figure 2 As shown. Figure 2 It can be seen that after adding a temperature sensor, the present invention can set a reasonable temperature control according to the deacidification liquid solvent vapor pressure-temperature curve and the actual measured pressure of the immersion environment in the literature, and then adjust and control according to the actual measured temperature of the deacidification liquid and the corresponding temperature of the saturated vapor pressure of the solvent under the immersion environment pressure. When the actual measured temperature of the deacidification liquid is greater than the corresponding temperature of the saturated vapor pressure of the solvent under the immersion environment pressure, the refrigerant flow rate is increased. When the actual measured temperature of the deacidification liquid is less than the corresponding temperature of the saturated vapor pressure of the solvent under the immersion environment pressure, the refrigerant flow rate is maintained, thereby reducing the solvent evaporation amount and reducing the pressure of deacidification liquid solvent recovery.

[0041] The device provided by the present invention arranges a refrigerant pipeline, a heat exchanger and a temperature sensor in the deacidification liquid output pipeline. Under the action of the output circulation pump, the deacidification liquid with a higher temperature passes through the heat exchanger, and the heat exchanger is provided with a refrigerant pipeline. The refrigerant pipeline contains a refrigerant with a lower temperature. The temperature of the deacidification liquid can be significantly reduced under the action of the refrigerant exchange, thereby forming a low-temperature deacidification liquid. The temperature sensor can transmit the temperature of the low-temperature deacidification liquid to the temperature control center, so as to regulate the flow of the refrigerant in the refrigerant pipeline according to the temperature of the low-temperature deacidification liquid, and then control the temperature of the low-temperature deacidification liquid to reach the required temperature, thereby reducing the solvent evaporation amount of batch documents during the negative pressure impregnation process, reducing the pressure of the deacidification liquid solvent recovery, and effectively stabilizing the concentration of the deacidification liquid during the impregnation process.

[0042] The present invention also provides a method for controlling the evaporation amount of the deacidification liquid solvent, and the negative pressure immersion deacidification process of batch paper documents is carried out using the device for controlling the evaporation amount of the deacidification liquid solvent described in the above technical solution.

[0043] In the present invention, the deacidification liquid solvent is preferably a fluorocarbon solvent, more preferably a fluorinated liquid DA-308; the chemical formula of the fluorinated liquid DA-308 is C4H3F7O.

[0044] In the present invention, the immersion pressure during the negative pressure immersion deacidification process of batch paper documents is preferably 3-10 KPa, more preferably 5 KPa; the immersion time during the negative pressure immersion deacidification process of batch paper documents is preferably 20-50 min, more preferably 30 min.

[0045] The method provided by the present invention uses a device for controlling the evaporation amount of the deacidification liquid solvent to carry out the negative pressure immersion deacidification process for batch paper documents. Under the same negative pressure immersion conditions, the temperature of the deacidification liquid can be effectively reduced to a temperature corresponding to a point where the solvent vapor pressure is lower than the immersion pressure point, thereby effectively reducing the evaporation consumption of the solvent, stabilizing the concentration of the deacidification liquid, and improving the stability of the negative pressure immersion deacidification quality of batch documents.

[0046] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] A device for controlling the evaporation amount of a deacidification liquid solvent comprises a heat exchanger, a refrigerant pipeline and a temperature sensor; the refrigerant pipeline is connected to the heat exchanger, and the temperature sensor is arranged behind the outlet of the heat exchanger.

[0049] Example 2

[0050] like Figure 1 As shown, the device for controlling the evaporation amount of the deacidification liquid solvent includes a deacidification liquid storage tank 1, an output circulation pump 2, a deacidification liquid output pipeline 3, a refrigerant pipeline 4, a heat exchanger 5, a temperature sensor 6, an immersion tank air inlet 7, an immersion tank exhaust port 8, an immersion tank 9, a batch of paper documents 10, a deacidification liquid input pipeline 11 and an input circulation pump 12;

[0051] The outlet of the deacidification liquid storage tank 1 is connected to the inlet of the immersion tank 9 through the deacidification liquid output pipeline 3;

[0052] The output circulation pump 2 is arranged at one end of the deacidification liquid output pipeline 3 close to the deacidification liquid storage tank 1;

[0053] The heat exchanger 5 is arranged between the output circulation pump 2 and the immersion tank 9;

[0054] The refrigerant pipeline 4 is connected to the heat exchanger 5, and the refrigerant pipeline 4 passes through the interior of the heat exchanger 5;

[0055] A temperature sensor 6 is provided in the deacidification liquid output pipeline 3 between the heat exchanger 5 and the immersion tank 9;

[0056] The top of the immersion tank 9 is provided with an immersion tank air inlet 7 and an immersion tank exhaust port 8;

[0057] A batch of paper documents 10 are placed in the immersion tank 9;

[0058] The inlet of the deacidification liquid storage tank 1 is connected to the outlet of the immersion tank 9 through the deacidification liquid input pipeline 11;

[0059] The deacidification liquid input pipeline 11 is provided with an input circulation pump 12;

[0060] Example 3

[0061] A method for controlling the evaporation amount of a deacidification liquid solvent, using the device for controlling the evaporation amount of a deacidification liquid solvent provided in Example 2 to perform a negative pressure immersion deacidification process for batches of paper documents, the specific operation is as follows:

[0062] (1) A deacidification solution is prepared using a fluorocarbon solvent, wherein the fluorocarbon solvent is a commercially available fluorinated liquid DA-308, and the chemical formula is C4H3F7O;

[0063] (2) The area of ​​the immersion tank is 1.7m 2 ;

[0064] (3) The pressure of negative pressure impregnation of batch documents is 5KPa, and the impregnation time is 30min;

[0065] (4) The temperature of the deacidified liquid entering the immersion tank is 5°C;

[0066] (5) After the negative pressure impregnation process was completed, the solvent consumed by evaporation was measured and weighed to be 90 kg.

[0067] Example 4

[0068] A method for controlling the evaporation amount of a deacidification liquid solvent, using the device for controlling the evaporation amount of a deacidification liquid solvent provided in Example 2 to perform a negative pressure immersion deacidification process for batches of paper documents, the specific operation is as follows:

[0069] (1) A deacidification solution is prepared using a fluorocarbon solvent, wherein the fluorocarbon solvent is a commercially available fluorinated liquid DA-308, and the chemical formula is C4H3F7O;

[0070] (2) The area of ​​the immersion tank is 1.7m 2 ;

[0071] (3) The pressure of negative pressure impregnation of batch documents is 5KPa, and the impregnation time is 30min;

[0072] (4) The temperature of the deacidified liquid entering the immersion tank is -15°C;

[0073] (5) After the negative pressure impregnation process was completed, the solvent consumed by evaporation was measured and weighed to be 10 kg.

[0074] Comparative Example 1

[0075] The specific operation of negative pressure impregnation deacidification process for batch paper documents is as follows:

[0076] (1) A deacidification solution is prepared using a fluorocarbon solvent, wherein the fluorocarbon solvent is a commercially available fluorinated liquid DA-308, and the chemical formula is C4H3F7O;

[0077] (2) The area of ​​the immersion tank is 1.7m 2 ;

[0078] (3) The pressure of negative pressure impregnation of batch documents is 5KPa, and the impregnation time is 30min;

[0079] (4) The temperature of the deacidified liquid entering the immersion tank is 25°C;

[0080] (5) After the negative pressure impregnation process was completed, the solvent consumed by evaporation was measured and weighed to be 230 kg;

[0081] Compared with Example 2, the device used in the negative pressure impregnation deacidification process for batch paper documents does not have a heat exchanger, a refrigerant pipeline and a temperature sensor.

[0082] The vapor pressure-temperature characteristic curves of the fluorinated liquid DA-308 used in Examples 3 to 4 and Comparative Example 1 are as follows: Figure 3 As shown. Figure 3 It can be seen that as the temperature increases, the saturated vapor pressure of the fluorinated liquid DA-308 gradually increases, making it easier to evaporate and consume. Therefore, the present invention can reduce and control the temperature of the fluorinated liquid DA-308 by arranging a heat exchanger, a refrigerant pipeline and a temperature sensor in the device, thereby reducing its saturated vapor pressure and further reducing the evaporation consumption of the fluorinated liquid DA-308.

[0083] The performance parameters of Examples 3 to 4 and Comparative Example 1 are compared in Table 1:

[0084] Table 1 Comparison of performance parameters of Examples 3 to 4 and Comparative Example 1

[0085]

[0086] It can be seen from Table 1 that after adopting the device and method of the present invention, under the same negative pressure impregnation conditions, lowering the temperature of the deacidification solution to a temperature corresponding to the solvent vapor pressure being lower than the impregnation pressure point can effectively reduce the evaporation consumption of the deacidification solution solvent, which is beneficial to stabilizing the concentration of the deacidification solution and improving the stability of the quality of negative pressure impregnation deacidification of batch documents.

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for controlling the evaporation amount of a deacidification liquid solvent, comprising a heat exchanger, a refrigerant pipeline and a temperature sensor; the refrigerant pipeline is connected to the heat exchanger, and the temperature sensor is arranged behind the outlet of the heat exchanger.

2. The device according to claim 1, characterized in that The refrigerant pipeline passes through the interior of the heat exchanger.

3. The device according to claim 1, characterized in that The device for controlling the evaporation amount of the deacidification liquid solvent comprises a deacidification liquid storage tank, a deacidification liquid output pipeline, a refrigerant pipeline, a heat exchanger, a temperature sensor, an immersion tank and a deacidification liquid input pipeline; The outlet of the deacidification liquid storage tank is connected to the inlet of the immersion tank through a deacidification liquid output pipeline; The inlet of the deacidification liquid storage tank is connected to the outlet of the immersion tank through a deacidification liquid input pipeline; A heat exchanger is arranged in the deacidification liquid output pipeline.

4. The device according to claim 3, characterized in that The device for controlling the evaporation amount of the deacidification liquid solvent also includes an output circulation pump.

5. The device according to claim 4, characterized in that The output circulation pump is arranged at one end of the deacidification liquid output pipeline close to the deacidification liquid storage tank.

6. The device according to claim 3, characterized in that The top of the immersion tank is provided with an immersion tank air inlet and an immersion tank exhaust port.

7. The device according to claim 3, characterized in that A batch of paper documents are placed inside the immersion tank.

8. The device according to claim 3, characterized in that The device for controlling the evaporation amount of the deacidification liquid solvent also includes an input circulation pump.

9. The device according to claim 8, characterized in that The input circulation pump is arranged in the deacidification liquid input pipeline.

10. A method for controlling the evaporation amount of a deacidification solution solvent, using the device for controlling the evaporation amount of a deacidification solution solvent as claimed in any one of claims 1 to 9 to carry out a negative pressure immersion deacidification process for batches of paper documents.

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