Treatment system and method for acid-containing nitrocellulose

Abstract

The invention discloses a treatment system for acid-containing nitrocellulose. The treatment system comprises a pre-neutralization tank, a first centrifugal machine, a hot washing pH value adjusting tank, a normal-temperature washing tank and a second centrifugal machine which are sequentially communicated through pipelines, the collecting tank is respectively communicated with the pre-neutralizing tank, the first centrifugal machine, the hot washing pH value adjusting tank, the normal-temperature washing tank and the second centrifugal machine through pipelines; a first stirrer, a funnel-shaped feeding hole, a first-stage alkaline water pipe and a second pH probe are arranged on the top wall of the pre-neutralizing tank; a second-stage alkaline water pipe is arranged on the near side, right facing the material pushing direction, of the first centrifugal machine; a second stirrer and a first pH probe are arranged on the top wall of the hot washing pH value adjusting tank; a third stirrer and a normal-temperature water washing pipe are arranged on the top wall of the normal-temperature washing tank. By using the system, the problem that acid-containing nitrocellulose cannot be directly dried is solved. The invention further discloses a treatment method of the acid-containing nitrocellulose.

Description

Technical Field

[0001] The invention belongs to the technical field of acidic nitrocellulose treatment, and in particular relates to a treatment system for acidic nitrocellulose, and also relates to a treatment method for acidic nitrocellulose. Background Art

[0002] Nitrocellulose is produced by esterification of nitric acid and sulfuric acid with refined cotton, and then stabilized. After sample preparation according to WJ35-2005 "Sample Preparation for Nitrocellulose Test Method", physical and chemical analysis indicators are tested according to various methods of WJ9028-2005. WJ35-2005 stipulates the sample preparation for various tests other than the moisture content of nitrocellulose and the Vienna stability test. According to this standard test procedure 3.4 "Put a piece of blue litmus paper on the sample in the aluminum box, and then put the aluminum box into the oven so that the sample and the bottom of the mercury ball of the thermometer in the oven are at the same level. The sample is dried at 110℃±2℃ for 30min~60min or 95℃~100℃ for 1h~2h", and test procedure 3.5 "Record the oven temperature every 20min and observe the color of the test paper. If the test paper turns red, the aluminum box should be taken out of the oven immediately." Because nitrocellulose is classified as Class 4.1 flammable solid in the list of hazardous chemicals, WJ35-2005 stipulates that the purpose of placing test paper is to monitor whether nitrocellulose decomposes during the heating process through the change in the color of the test paper, so as to ensure the safety of the sample drying process.

[0003] In the production process control of nitrocellulose, it is also necessary to understand the physical and chemical control indicators of nitrocellulose products in an acidic state before stabilization treatment, so as to find potential problems in advance, take corrective measures as soon as possible, and ensure that the quality indicators of subsequent products are controlled within the qualified range. However, since acidic nitrocellulose releases acidic gas during heating, the blue litmus paper turns red. According to the requirements of WJ35-2005, it needs to be taken out of the oven. In this way, subsequent tests cannot be carried out, and it is impossible to understand whether some quality control indicators of the product are within the specified range at this time.

[0004] The stabilization process in the production line is carried out under high temperature and high pressure. The purpose is to adjust the viscosity of nitrocellulose within the specified range in addition to the stabilization treatment. We test the indicators of acid nitrocellulose. The work we need to do is to ensure the safety of drying acid nitrocellulose and ensure that the treated acid nitrocellulose can reach the state where the blue litmus paper does not turn red. Summary of the invention

[0005] The first object of the present invention is to provide a system for treating acid-containing nitrocellulose, which solves the problem that acid-containing nitrocellulose cannot be directly dried.

[0006] The second object of the present invention is to provide a method for treating acid-containing nitrocellulose, which solves the problem that acid-containing nitrocellulose cannot be directly dried.

[0007] The first technical solution adopted by the present invention is that the treatment system of acid-containing nitrocellulose includes a pre-neutralization tank, a first centrifuge, a hot wash pH value adjustment tank, a normal temperature washing tank and a second centrifuge which are sequentially connected through pipelines; and also includes a collection tank which is connected to the pre-neutralization tank, the first centrifuge, the hot wash pH value adjustment tank, the normal temperature washing tank and the second centrifuge through pipelines respectively; The top wall of the pre-neutralization tank is provided with a first agitator, a funnel-shaped feed port, a primary alkaline water pipe and a second pH probe; A secondary alkaline water pipe is provided on the near side of the first centrifuge facing the material pushing direction; A second stirrer and a first pH probe are provided on the top wall of the hot wash pH value adjustment tank; A third agitator and a normal temperature water washing pipe are arranged on the top wall of the normal temperature washing tank.

[0008] The present invention is also characterized in that: A vent valve is provided on the top wall of the hot wash pH value adjusting tank.

[0009] The pre-neutralization tank is connected to the collection tank through a first pipeline; The first centrifuge is connected to the collection tank through a second pipeline; The hot wash pH value adjustment tank is connected to the collection tank through a third pipeline; The normal temperature washing tank is connected to the collection tank through an eighth pipeline; The second centrifuge is connected to the collection tank through a ninth pipeline; A first drain valve is provided on the first pipeline; The eighth pipeline is provided with a second liquid discharge valve; The third pipeline is provided with a third liquid discharge valve.

[0010] The pre-neutralization tank is connected to the first centrifuge through a fourth pipeline; The first centrifuge is connected to the hot wash pH value adjustment tank through a fifth pipeline; The hot wash pH value adjustment tank is connected to the normal temperature washing tank through the sixth pipeline; The normal temperature washing tank is connected to the second centrifuge through a seventh pipeline; The fourth pipeline is provided with a first pump; A second pump is provided on the fifth pipeline; The sixth pipeline is provided with a third pump; The seventh pipeline is provided with a fourth pump.

[0011] A first filtering bottom plate is arranged in the pre-neutralization tank; A second filtering bottom plate is provided in the hot wash pH value adjusting tank; A third filtering bottom plate is arranged in the normal temperature washing tank.

[0012] The second technical solution adopted by the present invention is a method for treating acid-containing nitrocellulose, using the above system, and the specific process is as follows: The acid-containing nitrocellulose material (generally the residual acid (calculated as sulfuric acid) content is 4wt%-8wt%) enters the pre-neutralization tank through the funnel-shaped feed port, and is stirred under the stirring and primary sodium carbonate solution environment. When the pH value reaches 5-6 using a pH probe, the water is drained and then transferred to the first centrifuge. A secondary sodium carbonate solution is added to the first centrifuge to drive out the acid. After centrifugal neutralization and acid-dried nitrocellulose, it enters the hot washing pH value adjustment tank for hot water washing. After the first pH probe determines that the pH value reaches 7-8, it is transferred to a normal temperature washing tank and then centrifuged using a second centrifuge. The centrifuged material is directly placed in an oven for drying.

[0013] The present invention is also characterized in that: The process parameters involved in the material in the pre-neutralization tank are as follows: the concentration of the primary sodium carbonate solution is 1wt%-3wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L-500g / L; the stirring time is 20min-30min.

[0014] The process parameters involved in the first centrifuge are specifically as follows: centrifugal speed is 200 rpm-300 rpm; pushing times are 20 times / min-30 times / min; secondary sodium carbonate solution is 4wt%-6wt%; and the amount of secondary sodium carbonate solution added is 5L / min-10L / min.

[0015] The process parameters involved in the hot wash pH value adjustment tank are as follows: hot water washing time is 20min-30min; hot water washing temperature is 45℃-65℃; pH value is 7-8; The specific process parameters involved in the normal temperature washing tank are: washing time is 20min-30min; The process parameters involved in the second centrifuge are specifically: centrifugal speed is 800 rpm-1000 rpm; centrifugal time is 10 min-15 min.

[0016] The beneficial effects of the present invention are: (1) The method of the present invention adopts a two-stage neutralization method, firstly using a low-concentration sodium carbonate solution for neutralization, and then using another concentration of sodium carbonate solution for centrifugal neutralization, thereby solving the problem that acid-containing nitrocellulose (nitrocellulose or nitrocellulose) cannot be directly dried; (2) The method of the present invention adopts a centrifugal spraying and alkali neutralization acid method, which improves work efficiency; (3) The method of the present invention controls the pH value step by step through automatic pH probe testing, pre-neutralization to a pH value of 5-6, hot washing to a pH value of 7-8 and then washing at room temperature. Alkali can be added in the hot washing stage to ensure that the pH value is qualified. Step-by-step control and the use of pH probes ensure effective control of the pH value at different stages, which is conducive to improving work efficiency.

[0017] (4) The acidic nitrocellulose is pre-treated by the system of the present invention, and the treated nitrocellulose can be dried in an oven, and then the next step of quality index analysis can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of the method for treating acid-containing nitrocellulose.

[0019] In the figure, 1. pre-neutralization tank, 2. first centrifuge, 3. hot washing pH value adjustment tank, 4. normal temperature washing tank, 5. second centrifuge, 6. collection tank, 7. first agitator, 8. funnel-shaped feed port, 9. primary alkaline water pipe, 10. secondary alkaline water pipe, 11. second agitator, 12. first pH probe, 13. air release valve, 14. third agitator, 15. normal temperature water washing pipe, 16. first pipeline, 17. second pipeline, 18. third Pipeline, 19. First drain valve, 20. Second drain valve, 21. Third drain valve, 22. Fourth pipeline, 23. Fifth pipeline, 24. Sixth pipeline, 25. Seventh pipeline, 26. First pump, 27. Second pump, 28. Third pump, 29. Fourth pump, 30. First filter bottom plate, 31. Water pipe, 32. Eighth pipeline, 33. Ninth pipeline, 34. Second filter bottom plate, 35. Third filter bottom plate, 36. Second pH probe. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The present invention provides a system for treating acid-containing nitrocellulose, such as Figure 1As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6, which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8 and a primary alkaline water pipe 9 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to wash away the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed, so as to avoid the residual materials of the previous batch of products from mixing into the next batch of products to be processed, thereby affecting the analysis index of the next batch.

[0022] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0023] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0024] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0025] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0026] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0027] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0028] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0029] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of the primary sodium carbonate solution, and the pH value is measured by the second pH probe 36. When the pH value reaches 5-6, the mixture is drained and transferred to the first centrifuge 2. The secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized to drive out the acid enters the hot washing pH value adjusting tank 3 for hot water washing. After the first pH probe 12 determines that the pH value reaches 7-8 (if it is unqualified, hot washing with alkali is adopted), the mixture is transferred to the normal temperature washing tank 4 and then centrifuged in the second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0030] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 1wt%-3wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L-500g / L; the stirring time is 20min-30min; and the pH value is 5-6.

[0031] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 200 rpm-300 rpm; pushing times are 20 times / min-30 times / min; secondary sodium carbonate solution is 4wt%-6wt%; the amount of secondary sodium carbonate solution added is 5L / min-10L / min; The process parameters involved in the hot washing pH value adjusting tank 3 are as follows: hot water washing time is 20min-30min; hot water washing temperature is 45℃-65℃; pH value is 7-8; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 20min-30min; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 800 rpm-1000 rpm; the centrifugal time is 10 min-15 min.

[0032] The process parameters of each section are shown in Table 1: Table 1 Process parameters of each stage

[0033] Example 1 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8, a primary alkaline water pipe 9 and a second pH probe 36 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, thereby affecting the analytical indicators of the next batch.

[0034] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0035] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0036] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0037] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0038] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0039] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0040] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0041] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of the primary sodium carbonate solution, and the pH value is determined to reach 5 through the second pH probe 36, and then the water is drained and transferred to the first centrifuge 2. The secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized and driven out of the acid is washed with hot water in the hot washing pH value adjusting tank 3. After the pH value is determined to reach 7 through the first pH probe 12 (if it is unqualified, hot washing with alkali is adopted), it is transferred to the normal temperature washing tank 4 and then centrifuged using the second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0042] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 1wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L; and the stirring time is 20min.

[0043] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 200 rpm; pushing times is 20 times / min; secondary sodium carbonate solution is 4wt%; the amount of secondary sodium carbonate solution added is 5L / min; The process parameters involved in the hot washing pH value adjustment tank 3 are as follows: hot water washing time is 20 minutes; hot water washing temperature is 45°C; pH value is 7; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 20 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 800 rpm; the centrifugal time is 10 min.

[0044] Example 2 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8, a primary alkaline water pipe 9 and a second pH probe 36 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, thereby affecting the analytical indicators of the next batch.

[0045] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0046] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0047] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0048] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0049] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0050] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0051] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0052] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of a primary sodium carbonate solution, and the water is drained after the pH value reaches 5.5, and then transferred to the first centrifuge 2. A secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized to drive out the acid enters the hot washing pH value adjusting tank 3 for hot water washing. After the first pH probe 12 determines that the pH value reaches 7.5 (if it is unqualified, hot washing with alkali is adopted), the mixture is transferred to the normal temperature washing tank 4 and then centrifuged in the second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0053] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 2wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 400g / L; and the stirring time is 25min.

[0054] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 250 rpm; pushing times is 25 times / min; secondary sodium carbonate solution is 5wt%; the amount of secondary sodium carbonate solution added is 6L / min; The process parameters involved in the hot washing pH value adjustment tank 3 are as follows: hot water washing time is 25 minutes; hot water washing temperature is 50°C; pH value is 8; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 25 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 900 rpm; the centrifugal time is 12 min.

[0055] Example 3 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8, a primary alkaline water pipe 9 and a second pH probe 36 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, thereby affecting the analytical indicators of the next batch.

[0056] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0057] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0058] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0059] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0060] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0061] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0062] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0063] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of a primary sodium carbonate solution. When the pH value reaches 6, the mixture is drained and transferred to the first centrifuge 2. A secondary sodium carbonate solution is added to the first centrifuge 2 to remove the acid. The nitrocellulose that has been centrifugally neutralized and removed the acid is washed with hot water in a hot washing pH value adjusting tank 3. After the pH value reaches 8 through a first pH probe 12 (if it is unqualified, hot washing with alkali is adopted), the mixture is transferred to a normal temperature washing tank 4 and then centrifuged in a second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0064] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 3wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 500g / L; and the stirring time is 30min.

[0065] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 300 rpm; pushing times is 30 times / min; secondary sodium carbonate solution is 6wt%; the amount of secondary sodium carbonate solution added is 10L / min; The process parameters involved in the hot washing pH value adjustment tank 3 are as follows: hot water washing time is 30 minutes; hot water washing temperature is 65°C; pH value is 7.5; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 30 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 1000 rpm; the centrifugal time is 15 min.

[0066] Example 4 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8, a primary alkaline water pipe 9 and a second pH probe 36 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, thereby affecting the analytical indicators of the next batch.

[0067] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0068] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0069] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0070] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0071] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0072] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0073] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0074] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of a primary sodium carbonate solution, and the water is drained after the pH value reaches 5.6, and then transferred to the first centrifuge 2. A secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized to drive out the acid enters the hot washing pH value adjusting tank 3 for hot water washing. After the first pH probe 12 determines that the pH value reaches 7 (if it is unqualified, an alkali hot washing method is used), the mixture is transferred to a normal temperature washing tank 4 and then centrifuged in a second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0075] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 1wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 500g / L; and the stirring time is 30min.

[0076] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 200 rpm; pushing times is 30 times / min; secondary sodium carbonate solution is 4wt%; the amount of secondary sodium carbonate solution added is 9L / min; The process parameters involved in the hot washing pH value adjustment tank 3 are as follows: hot water washing time is 30 minutes; hot water washing temperature is 65°C; pH value is 8; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 30 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 800 rpm; the centrifugal time is 10 min.

[0077] Example 5 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8, a primary alkaline water pipe 9 and a second pH probe 36 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, thereby affecting the analytical indicators of the next batch.

[0078] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0079] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0080] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0081] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0082] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0083] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0084] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0085] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of a primary sodium carbonate solution, and the water is drained after the pH value reaches 5.8, and then transferred to the first centrifuge 2. A secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized to drive out the acid enters the hot washing pH value adjusting tank 3 for hot water washing. After the first pH probe 12 determines that the pH value reaches 8 (if it is unqualified, an alkali hot washing method is used), the mixture is transferred to a normal temperature washing tank 4 and then centrifuged in a second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0086] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 3wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L; and the stirring time is 20min.

[0087] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 300 rpm; pushing times is 20 times / min; secondary sodium carbonate solution is 6wt%; the amount of secondary sodium carbonate solution added is 10L / min; The process parameters involved in the hot wash pH value adjustment tank 3 are as follows: hot water washing time is 28 minutes; hot water washing temperature is 63°C; pH value is 7; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 30 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 1000 rpm; the centrifugal time is 15 min.

[0088] Example 6 Treatment systems for acid-containing nitrocellulose, such as Figure 1 As shown, it includes a pre-neutralization tank 1, a first centrifuge 2, a hot washing pH value adjustment tank 3, a normal temperature washing tank 4 and a second centrifuge 5 which are connected in sequence through pipelines; it also includes a collecting tank 6 which is connected to the pre-neutralization tank 1, the first centrifuge 2, the hot washing pH value adjustment tank 3, the normal temperature washing tank (4) and the second centrifuge 5 through pipelines respectively; a first stirrer 7, a funnel-shaped feed port 8 and a primary alkaline water pipe 9 are arranged on the top wall of the pre-neutralization tank 1; a water pipe 31 is arranged above the funnel-shaped feed port 8, and the first function of the water pipe is to flush the residual nitrocellulose in the funnel-shaped feed port 8 through the water pipe 31, and the water consumption is relatively small; the second function of the water pipe is to switch different types of nitrocellulose to clean the pre-neutralization tank after the pre-neutralization is completed. This prevents the residual materials of the previous batch of products from mixing into the next product to be processed, affecting the analysis index of the next batch.

[0089] A secondary alkaline water pipe 10 is arranged at the side wall of the first centrifuge 2 facing the pushing direction. The part of the alkaline water pipe extending into the centrifuge is provided with a spray hole with a diameter of about 2mm, which has the function of dispersing the alkaline water and improving the uniformity of the alkaline water distribution.

[0090] The first centrifuge 2 is a horizontal pusher centrifuge; the second centrifuge 5 is a vertical centrifuge.

[0091] A second stirrer 11 and a first pH probe 12 are provided on the top wall of the hot wash pH value adjustment tank 3; A third agitator 14 and a normal temperature water washing pipe 15 are provided on the top wall of the normal temperature washing tank 4 .

[0092] An air release valve 13 is provided on the top wall of the hot wash pH value adjusting tank 3 .

[0093] The pre-neutralization tank 1 is connected to the collection tank 6 through a first pipeline 16; The first centrifuge 2 is connected to the collection tank 6 through a second pipe 17; The hot wash pH value adjustment tank 3 is connected to the collection tank 6 through a third pipeline 18; The normal temperature washing tank 4 is connected to the collecting tank 6 through an eighth pipe 32; The second centrifuge 5 is connected to the collection tank 6 through a ninth pipeline 33; A first drain valve 19 is provided on the first pipeline 16; The eighth pipeline 32 is provided with a second liquid discharge valve 20; The third pipeline 18 is provided with a third liquid discharge valve 21 .

[0094] The pre-neutralization tank 1 is connected to the first centrifuge 2 through a fourth pipeline 22; The first centrifuge 2 is connected to the hot wash pH value adjustment tank 3 through the fifth pipeline 23; The hot wash pH value adjustment tank 3 is connected to the normal temperature washing tank 4 through the sixth pipeline 24; The normal temperature washing tank 4 is connected to the second centrifuge 5 through the seventh pipeline 25; The fourth pipeline 22 is provided with a first pump 26; The fifth pipeline 23 is provided with a second pump 27; The sixth pipeline 24 is provided with a third pump 28; A fourth pump 29 is provided on the seventh pipeline 25 .

[0095] A first filtering bottom plate 30 is provided in the pre-neutralization tank 1; A second filtering bottom plate 34 is provided in the hot wash pH value adjusting tank 3; A third filter bottom plate 35 is provided in the normal temperature washing tank 4. The filter bottom plate is a stainless steel filter screen plate with a mesh size of 60-80.

[0096] The present invention also adopts the above system through a method for treating acid-containing nitrocellulose, and the specific process is as follows: The acid nitrocellulose-containing material enters the pre-neutralization tank 1 through the funnel-shaped feed port 8, and is stirred and The mixture is stirred in the environment of a primary sodium carbonate solution, and the water is drained after the pH value reaches 6, and then transferred to the first centrifuge 2. A secondary sodium carbonate solution is added to the first centrifuge 2 to drive out the acid. The nitrocellulose that has been centrifuged and neutralized to drive out the acid enters the hot washing pH value adjustment tank 3 for hot water washing. After the first pH probe 12 determines that the pH value reaches 7 (if it is unqualified, an alkali hot washing method is used), the mixture is transferred to a normal temperature washing tank 4 and then centrifuged in a second centrifuge 5. The centrifuged material is directly placed in an oven for drying.

[0097] The process parameters involved in the material in the pre-neutralization tank 1 are as follows: the concentration of the primary sodium carbonate solution is 1.5wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L; and the stirring time is 20min.

[0098] The process parameters involved in the first centrifuge 2 are as follows: centrifugal speed is 300 rpm; pushing times is 20 times / min; secondary sodium carbonate solution is 4wt%; the amount of secondary sodium carbonate solution added is 10L / min; The process parameters involved in the hot washing pH value adjustment tank 3 are as follows: hot water washing time is 30 minutes; hot water washing temperature is 65°C; pH value is 7; The process parameters involved in the normal temperature washing tank 4 are specifically: the washing time is 30 minutes; The process parameters involved in the second centrifuge 5 are specifically: the centrifugal speed is 800 rpm; the centrifugal time is 10 min.

Claims

1. A system for treating acid-containing nitrocellulose, characterized in that: The invention comprises a pre-neutralization tank (1), a first centrifuge (2), a hot wash pH value adjustment tank (3), a normal temperature washing tank (4) and a second centrifuge (5) which are sequentially connected through pipelines; and a collecting tank (6) which is respectively connected to the pre-neutralization tank (1), the first centrifuge (2), the hot wash pH value adjustment tank (3), the normal temperature washing tank (4) and the second centrifuge (5) through pipelines; A first stirrer (7), a funnel-shaped feed port (8), a primary alkaline water pipe (9) and a second pH probe (36) are provided on the top wall of the pre-neutralization tank (1); A secondary alkaline water pipe (10) is provided on the proximal side of the first centrifuge (2) facing the material pushing direction; A second stirrer (11) and a first pH probe (12) are arranged on the top wall of the hot wash pH value adjustment tank (3); A third agitator (14) and a normal temperature water washing pipe (15) are provided on the top wall of the normal temperature washing tank (4).

2. The system for treating acid-containing nitrocellulose according to claim 1, characterized in that: A vent valve (13) is provided on the top wall of the hot wash pH value adjustment tank (3).

3. The system for treating acid-containing nitrocellulose according to claim 1, characterized in that: The pre-neutralization tank (1) is connected to the collection tank (6) via a first pipeline (16); The first centrifuge (2) is connected to the collection tank (6) via a second pipe (17); The hot wash pH value adjustment tank (3) is connected to the collection tank (6) via a third pipeline (18); The normal temperature washing tank (4) is connected to the collecting tank (6) via an eighth pipe (32); The second centrifuge (5) is connected to the collection tank (6) via a ninth pipeline (33); A first drain valve (19) is provided on the first pipeline (16); The eighth pipeline (32) is provided with a second liquid discharge valve (20); The third pipeline (18) is provided with a third liquid discharge valve (21).

4. The system for treating acid-containing nitrocellulose according to claim 1, characterized in that: The pre-neutralization tank (1) is connected to the first centrifuge (2) via a fourth pipeline (22); The first centrifuge (2) is connected to the hot wash pH value adjustment tank (3) through a fifth pipeline (23); The hot wash pH value adjustment tank (3) is connected to the normal temperature washing tank (4) via a sixth pipeline (24); The normal temperature washing tank (4) is connected to the second centrifuge (5) via a seventh pipe (25); A first pump (26) is provided on the fourth pipeline (22); A second pump (27) is provided on the fifth pipeline (23); A third pump (28) is provided on the sixth pipeline (24); A fourth pump (29) is provided on the seventh pipeline (25).

5. The system for treating acid-containing nitrocellulose according to claim 1, characterized in that: The pre-neutralization tank (1) is provided with a first filtering bottom plate (30); A second filtering bottom plate (34) is provided in the hot wash pH value adjusting tank (3); A third filtering bottom plate (35) is provided in the normal temperature washing tank (4).

6. A method for treating acid-containing nitrocellulose, characterized in that: Using the system as described in any one of claims 1 to 5, the specific process is as follows: The acid-containing nitrocellulose material enters the pre-neutralization tank (1) through the funnel-shaped feed port (8), and is stirred in the environment of stirring and primary sodium carbonate solution. When the pH value reaches 5-6, the material is drained and then transferred to the first centrifuge (2). In the first centrifuge (2), a secondary sodium carbonate solution is added to drive out the acid. After centrifugal neutralization and acid-dried nitrocellulose, it enters the hot washing pH value adjustment tank (3) for hot water washing. After the pH value reaches 7-8 through the first pH probe (12), it is transferred to the normal temperature washing tank (4) and then centrifuged using the second centrifuge (5). The material after centrifugation is directly placed in an oven for drying.

7. The method for treating acid-containing nitrocellulose according to claim 6, characterized in that: The process parameters involved in the material in the pre-neutralization tank (1) are as follows: the concentration of the primary sodium carbonate solution is 1wt%-3wt%; in the pre-neutralization tank 1, the material relationship between nitrocellulose and sodium carbonate solution is: 300g / L-500g / L; the stirring time is 20min-30min.

8. The method for treating acid-containing nitrocellulose according to claim 6, characterized in that: The process parameters involved in the first centrifuge (2) are specifically as follows: centrifugal speed of 200 rpm-300 rpm; pushing times of 20 times / min-30 times / min; secondary sodium carbonate solution of 4wt%-6wt%; and addition amount of secondary sodium carbonate solution of 5L / min-10L / min.

9. The method for treating acid-containing nitrocellulose according to claim 6, characterized in that: The process parameters involved in the hot washing pH value adjustment tank (3) are as follows: hot water washing time is 20 min-30 min; hot water washing temperature is 45° C.-65° C.; pH value is 7-8; The process parameters involved in the normal temperature washing tank (4) are as follows: the washing time is 20 min-30 min; The process parameters involved in the second centrifuge (5) are specifically: the centrifugal speed is 800 rpm-1000 rpm; the centrifugal time is 10 min-15 min.

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