Post-crosslinking device for phenolic melt-blown material

Abstract

The invention relates to the technical field of thermal protection material production devices, and particularly discloses a post-crosslinking device for a phenolic melt-blown material, which comprises a reaction kettle, and a hydrochloric acid and formaldehyde crosslinking bath is arranged in a reaction cavity; the condensation pipe is communicated with the reaction cavity and is used for condensing the hydrochloric acid gas and the formaldehyde gas; the first collection equipment is communicated with the condensation pipe and is used for collecting formaldehyde; the second collection equipment is communicated with one side, far away from the reaction kettle, of the condensation pipe, is used for collecting hydrochloric acid and is connected with an exhaust pipe, and the exhaust pipe is communicated with the condensation pipe; one end of the purifying device is connected with the second collecting device, the other end of the purifying device is connected with a mixing device, and the mixing device is respectively connected with the reaction kettle and the first collecting device. The device systematically solves the problems of gas volatilization, corrosion and blockage in the traditional post-crosslinking process through sectional condensation, vacuum purification, closed-loop circulation and anti-corrosion design, and has high efficiency, environmental protection property and economical efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of thermal protection material production equipment, and in particular to a post-crosslinking device for phenolic melt-blown materials. Background Art

[0002] Autoclaves play a key role in the post-crosslinking process of phenolic meltblown materials. Phenolic meltblown materials need to be cured by immersion in a crosslinking bath containing hydrochloric acid and formaldehyde. Autoclaves provide the appropriate temperature and reaction time for the curing of phenolic meltblown materials. During the heating process of traditional autoclaves, hydrochloric acid and formaldehyde are easily volatile. Hydrochloric acid gas (hydrogen chloride) is highly corrosive and easily soluble in water, potentially causing corrosion in condensation pipes. Formaldehyde gas, due to its low boiling point (-19°C), requires extremely low temperatures to condense and easily polymerizes to form paraformaldehyde, which can clog pipes. Summary of the Invention

[0003] In order to solve the problem of volatilization of formaldehyde and hydrochloric acid gases in the existing post-crosslinking reaction process, the present application provides a post-crosslinking device for phenolic melt-blown material.

[0004] The present application provides a post-crosslinking device for phenolic melt-blown material, which adopts the following technical solution:

[0005] A post-crosslinking device for a phenolic melt-blown material, comprising:

[0006] The reactor comprises a reactor body and a reactor cover, wherein a reaction chamber is provided in the reactor body, and a hydrochloric acid and formaldehyde cross-linking bath is provided in the reaction chamber;

[0007] a condenser, connected to the reaction chamber, for condensing hydrochloric acid gas and formaldehyde gas;

[0008] a first collecting device and a second collecting device, wherein the first collecting device is connected to the condenser and is used to collect formaldehyde; the second collecting device is connected to a side of the condenser away from the reactor and is used to collect hydrochloric acid, and an exhaust pipe is connected to the second collecting device, and the exhaust pipe is connected to the condenser;

[0009] A purification device, one end of which is connected to the second collecting device, and the other end of which is connected to a mixing device, and the mixing device is respectively connected to the reactor and the first collecting device.

[0010] By adopting the above technical solution, a closed-loop system is constructed by setting up a reactor, a condenser, a first collection device (formaldehyde collection), a second collection device (hydrochloric acid collection), a purification device and a mixing device. The volatilized gas from the cross-linking bath in the reactor is processed in sections through the condenser, and the formaldehyde and hydrochloric acid are recovered and purified separately and then remixed into a cross-linking bath, thereby reducing raw material waste and harmful gas emissions, and at the same time reducing the risk of equipment corrosion.

[0011] In some embodiments, the condenser includes a first condensation section and a second condensation section, a partition is arranged between the first condensation section and the second condensation section, the condensation temperature of the first condensation section is -20 to -30°C, the first collection device is connected to the side of the second condensation section away from the second collection device, and an air hole is opened on the partition, the partition is used to block the formaldehyde liquid, and the air hole is used to allow the hydrochloric acid gas to pass through.

[0012] By adopting the above technical solution, the condenser is divided into a first condensation section and a second condensation section. Taking advantage of the low boiling point of formaldehyde, formaldehyde gas is preferentially condensed in the first condensation section, and the formaldehyde liquid and hydrochloric acid gas are separated through the pores of the partition. The staged condensation improves the recovery efficiency of different gases and avoids purity problems caused by mixed condensation.

[0013] In some embodiments, the pore diameter at one end of the pore close to the reactor is larger than the pore diameter at one end close to the second collecting device.

[0014] By adopting the above technical solution, the aperture of the pores near the reactor end is larger, and the aperture near the second collection device end is smaller. The gas flow rate is adjusted through the tapered design, so that the hydrochloric acid gas contacts the spray liquid more evenly in the second condensation section, thereby improving the condensation efficiency and hydrochloric acid recovery rate.

[0015] In some embodiments, a plurality of spray heads are provided in the second condensation section, and the spray heads are arranged at intervals along the axial direction of the condensation tube.

[0016] By adopting the above technical solution, axially spaced spray heads are arranged in the second condensation section to increase the contact area and time between the condensate and the hydrochloric acid gas, enhance the gas-liquid mass transfer effect, and further reduce the possibility of hydrochloric acid gas escape.

[0017] In some embodiments, the second collecting device includes a shell, a spray assembly and a liquid storage box, the spray assembly includes a spray pipe and a nozzle, a plurality of spray pipes are provided, and each spray pipe is provided with a plurality of nozzles, the liquid storage box is provided at the bottom of the shell, the liquid storage box includes a first chamber and a second chamber, the first chamber is used to collect the hydrochloric acid solution, and the second chamber is used to store condensate, the first chamber is provided at the top of the second chamber, the spray pipe is connected to the second chamber, the exhaust pipe is provided at the top of the shell, the second chamber is provided with a liquid inlet pipe, the liquid inlet pipe is used to transport condensate to the liquid storage box, the first chamber is connected to a liquid outlet pipe, and the liquid outlet pipe is connected to the second collecting device.

[0018] By adopting this technical solution, the second collection device uses a double-layer liquid storage box (the first chamber collects the hydrochloric acid solution, and the second chamber stores the condensate). The condensate is circulated and sprayed through a spray assembly, achieving efficient absorption and separation of hydrochloric acid gas. The layered design prevents the condensate from mixing with the recovered hydrochloric acid, ensuring the purity of the hydrochloric acid solution.

[0019] In some embodiments, the first collection device includes a first vacuum pump, a collection shell and a temperature control tube, the first vacuum pump is connected to the collection shell, the first vacuum pump controls the pressure in the first collection device at 10-30 mmHg, an interlayer is provided in the collection shell, the temperature control tube is spirally wound in the interlayer, a connecting tube is provided on the collection shell, and the connecting tube is connected to the purification device.

[0020] By adopting the above technical solution, the first collection device integrates a first vacuum pump (10-30 mmHg) and a temperature control tube, which reduces the boiling point of formaldehyde by reducing the pressure and accelerates condensation; the temperature control tube is heated to prevent formaldehyde from polymerizing or forming paraformaldehyde, thereby avoiding pipeline blockage.

[0021] In some embodiments, a spiral tube is provided in the connecting tube, one end of the spiral tube is connected to the first collection device, and the other end of the spiral tube is connected to the purification device.

[0022] By adopting the above technical solution, the spiral tube in the connecting pipe extends the flow path of the formaldehyde solution, increases the purification reaction time, and at the same time separates the residual hydrochloric acid gas through secondary condensation to improve the purity of formaldehyde.

[0023] In some embodiments, the purification device includes a purification shell, a second vacuum pump and a coil, the coil is wound in the purification shell, the second vacuum pump is connected to the purification shell, and the second vacuum pump controls the pressure in the purification shell at 50-100 mmHg.

[0024] By adopting the above technical solution, the purification equipment adopts a second vacuum pump (50-100 mmHg) and a coil to reduce the boiling point of water by reducing the pressure, so that water evaporates first, concentrates the hydrochloric acid solution, and improves the purity and concentration of the hydrochloric acid.

[0025] In some embodiments, a metering pump is provided between the first collecting device and the mixing device, and a metering pump is provided between the purification device and the mixing device.

[0026] By adopting the above technical solution, the metering pump accurately controls the mixing ratio of formaldehyde and hydrochloric acid, ensuring the stability of the cross-linking bath formula while avoiding excessive waste of raw materials.

[0027] In some embodiments, the reactor, the condenser, the first collecting device, the second collecting device, the purification device, and the mixing device are all provided with an anti-corrosion coating.

[0028] By adopting the above technical solution and providing an anti-corrosion coating, it helps to avoid corrosion of the equipment as much as possible, thereby increasing the service life of the equipment.

[0029] Compared with the prior art, this application has at least one of the following beneficial technical effects:

[0030] 1. Through segmented condensation, dedicated collection equipment, and purification-mixing systems, the volatile formaldehyde and hydrochloric acid gases are recovered and reconfigured into a cross-linking bath, significantly reducing raw material consumption and environmental pollution;

[0031] 2. The segmented design of the condenser pipe and the application of the spray system reduce the direct corrosion of hydrochloric acid gas on the pipe and extend the life of the equipment;

[0032] 3. By setting up an anti-corrosion coating, the equipment can be prevented from being corroded by hydrochloric acid as much as possible, thereby increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the post-crosslinking device of the phenolic melt-blown material in the embodiment of the present application.

[0034] Figure 2 It is a cross-sectional view of the internal structure of the condenser in the embodiment of the present application.

[0035] Figure 3 This is an internal cross-sectional view of the first collecting device in an embodiment of the present application.

[0036] Figure 4 It is an internal cross-sectional view of the second collecting device in an embodiment of the present application.

[0037] Figure 5 It is a structural diagram of the spray assembly in an embodiment of the present application.

[0038] In the picture:

[0039] 1. Reactor; 11. Reactor body; 12. Reactor cover; 2. Condenser; 21. First condensation section; 22. Second condensation section; 23. Spray head; 24. Partition; 241. Air hole; 3. First collecting device; 31. Collecting shell; 32. Temperature control tube; 33. Interlayer; 34. Connecting tube; 4. Second collecting device; 41. Shell; 42. Spray assembly; 421. Spray pipe; 422. Nozzle; 43. Liquid storage box; 431. First chamber; 432. Second chamber; 44. Liquid inlet pipe; 45. Liquid outlet pipe; 46. Exhaust pipe; 5. Purification equipment; 6. Mixing equipment. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "and / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " herein, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0042] The present application provides a post-crosslinking device for phenolic melt-blown material, referring to Figure 1, comprising a reactor 1, a first collecting device 3, a second collecting device 4, a purification device 5 and a mixing device 6. The reactor 1 comprises a reactor body 11 and a reactor cover 12, which are detachably connected. A reaction chamber is provided in the reactor body 11, wherein a hydrochloric acid and formaldehyde cross-linking bath is provided in the reaction chamber. The reactor 1 heats the hydrochloric acid and formaldehyde cross-linking bath, and the phenolic melt-blown material solidifies in the cross-linking bath. The formaldehyde and hydrochloric acid liquids are easily volatilized by heat to produce hydrochloric acid gas and formaldehyde gas. A condenser 2 is provided on the reactor 1, one end of the condenser 2 is connected to the reaction chamber, and the hydrochloric acid gas and formaldehyde gas enter the condenser 2. The middle part of the condenser 2 is connected to the first collecting device 3, which is used to collect and purify the formaldehyde solution. The other end of the condenser 2 is connected to the second collecting device 4, which is used to collect the hydrochloric acid solution. Second collection device 4 is connected to an exhaust pipe 46, which is connected to the end of condenser pipe 2 near reactor 1. Exhaust pipe 46 is used to transport a portion of the exhaust gas from second collection device 4 to condenser pipe 2 for secondary treatment. Purification device 5 is connected to second collection device 4 at one end and to mixing device 6 at the other end. Mixing device 6 is connected to reactor 1. Purification device 5 is used to purify the hydrochloric acid solution, and mixing device 6 is used to mix the hydrochloric acid solution and formaldehyde solution to prepare a new cross-linking bath.

[0043] Specifically, refer to Figure 1 and Figure 2 In this embodiment, the condenser 2 is arranged obliquely between the reactor 1 and the second collection device 4. The condenser 2 includes a first condensation section 21 and a second condensation section 22. A partition 24 is provided between the first condensation section 21 and the second condensation section 22. The condensation temperature of the first condensation section 21 is between -20°C and -30°C. The first collection device 3 is connected to the side of the first condensation section 21 away from the reactor 1. The partition 24 is provided with air holes 241 for the passage of hydrochloric acid gas. The aperture of the air holes 241 near the reactor 1 is larger than the aperture near the second collection device 4, thereby minimizing the entry of formaldehyde liquid into the second condensation section 22 through the air holes 241. Since the boiling point of formaldehyde is approximately -19.5°C and the boiling point of hydrochloric acid is approximately -85°C, formaldehyde is a gas at room temperature. When the temperature is below -19.5°C, the formaldehyde condenses into a liquid, while the hydrochloric acid remains in a gaseous state. Therefore, the temperature of the first condensation section 21 is controlled at -20°C to -30°C, and formaldehyde can enter the first collecting device 3 in the form of liquid under the action of its own gravity, while the hydrochloric acid gas enters the second collecting device 4 along the condenser tube 2, thereby achieving preliminary separation of hydrochloric acid and formaldehyde.

[0044] Furthermore, in this embodiment, a plurality of spray heads 23 are provided in the second condensation section 22, and the spray heads 23 are arranged at intervals along the axial direction of the condenser tube 2. Since hydrochloric acid is easily soluble in water, the provision of the spray heads 23 enables the hydrochloric acid to dissolve in water to form a hydrochloric acid solution, which then flows through the condenser tube 2 into the second collection device 4.

[0045] Specifically, refer to Figure 1 、 Figure 4 and Figure 5 The second collecting device 4 includes a shell 41, a spray assembly 42 and a liquid storage box 43. The spray assembly 42 includes a spray pipe 421 and a nozzle 422. There are multiple spray pipes 421, and each spray pipe 421 is provided with multiple nozzles 422. The liquid storage box 43 is arranged at the bottom of the shell 41. The liquid storage box 43 includes a first chamber 431 and a second chamber 432. The first chamber 431 and the second chamber 432 are both independently sealed chambers. The first chamber 431 is used to collect hydrochloric acid solution, and the second chamber 432 is used to store condensate. The first chamber 431 is arranged at the top of the second chamber 432, the spray pipe 421 is connected to the second chamber 432, and the second chamber 432 is provided with a liquid inlet pipe 44. The liquid inlet pipe 44 is used to transport condensate to the liquid storage box 43. The first chamber 431 is connected to a liquid outlet pipe 45, and the liquid outlet pipe 45 is connected to the second collecting device 4. In the second condensing section 22 of the condenser 2, some of the hydrochloric acid gas dissolves in water to form a hydrochloric acid solution, while some of the hydrochloric acid remains in the form of gas. The hydrochloric acid gas and the hydrochloric acid liquid enter the second collection device 4 together. The spray assembly 42 sprays the hydrochloric acid gas again to increase the amount of hydrochloric acid gas dissolved in the water. The hydrochloric acid solution enters the first chamber 431 in the second collection device 4. A small amount of undissolved hydrochloric acid gas enters the second condensing section 22 through the exhaust pipe 46 for secondary treatment, thereby improving the recovery rate of the hydrochloric acid gas.

[0046] Further, refer to Figure 2 and Figure 3In some embodiments, the first collection device 3 includes a first vacuum pump (not shown), a collection shell 31, and a temperature control tube 32. The first vacuum pump is connected to the collection shell 31 and controls the pressure of the first collection device 3 to 10-30 mmHg, thereby lowering the boiling point of formaldehyde, volatilizing hydrochloric acid at low temperature and low pressure, and simultaneously condensing and recovering formaldehyde, thereby improving the purity of the formaldehyde. An interlayer 33 is provided within the collection shell 31, and a temperature control tube 32 is spirally wound within the interlayer 33 to control the temperature within the collection shell 31. The collection shell 31 is provided with a connecting tube 34, which is connected to the purification device 5. A spiral tube (not shown) is provided within the connecting tube 34, one end of which is connected to the first collection device 3 and the other end is connected to the purification device 5. When formaldehyde gas condenses into formaldehyde liquid and enters the collecting shell 31, some hydrochloric acid may enter the collecting shell 31 along with the formaldehyde. By heating the collecting shell 31, a small amount of hydrochloric acid in the collecting shell 31 can be evaporated and enter the spiral tube, condensed in the spiral tube, and finally collected in the purification equipment 5. The spiral tube can extend the flow path of the hydrochloric acid and achieve a better condensation effect.

[0047] Purification equipment 5 includes a purification shell, a second vacuum pump, and a coiled tube wound within the purification shell. The coiled tube is used to pass liquid through the coiled tube to control the temperature within the purification shell. The second vacuum pump is connected to the purification shell and controls the pressure within the purification shell at 50-100 mmHg. At this pressure, the boiling point of water drops to 40-60°C, causing it to evaporate preferentially. Hydrochloric acid, due to its high solubility, remains in the liquid phase, thereby increasing the concentration of the hydrochloric acid solution.

[0048] Furthermore, a metering pump is provided between the first collecting device 3 and the mixing device 6, and a metering pump is provided between the purification device 5 and the mixing device 6. The purified formaldehyde and hydrochloric acid are precisely flow-controlled by the metering pumps and quantitatively delivered to the mixing device 6, where the mixing ratio of the cross-linking bath is precisely controlled to generate a new cross-linking bath, which is then returned to the reactor 1 for recycling.

[0049] Furthermore, an anti-corrosion coating is provided inside the reactor 1, the condenser 2, the first collecting device 3, the second collecting device 4, the purification device 5 and the mixing device 6. The anti-corrosion coating helps to prevent the equipment from being corroded as much as possible, thereby increasing the service life of the equipment.

[0050] The embodiment principle of the post-crosslinking device for phenolic melt-blown material provided in this embodiment is as follows: the phenolic melt-blown material is solidified in the formaldehyde and hydrochloric acid cross-linking bath in the kettle body 11 of the reactor 1. During the heating process of the reactor 1, hydrochloric acid and formaldehyde are volatile, and the hydrochloric acid and formaldehyde gases enter the condenser 2. The formaldehyde gas is first liquefied in the condenser 2 and enters the first collecting device 3, and then purified in the first collecting device 3. The purified formaldehyde enters the mixing device 6, and the hydrochloric acid enters the second collecting device 4 through the condenser 2 to form a hydrochloric acid solution in the second collecting device 4. The hydrochloric acid solution enters the purification device 5 and is purified in the purification device 5. The purified hydrochloric acid solution enters the mixing device 6. The formaldehyde and hydrochloric acid are mixed in the mixing device 6, and after regenerating the cross-linking bath, they enter the reactor 1 to achieve collection and reuse.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A post-crosslinking device for phenolic melt-blown material, characterized in that: include: A reaction kettle (1) comprises a kettle body (11) and a kettle cover (12); a reaction chamber is provided in the kettle body (11); a hydrochloric acid and formaldehyde cross-linking bath is provided in the reaction chamber; a condenser (2), connected to the reaction chamber, for condensing hydrochloric acid gas and formaldehyde gas; a first collecting device (3) and a second collecting device (4), wherein the first collecting device (3) is connected to the condenser tube (2) and is used to collect formaldehyde; the second collecting device (4) is connected to a side of the condenser tube (2) away from the reactor (1), and the second collecting device (4) is used to collect hydrochloric acid; an exhaust pipe (46) is connected to the second collecting device (4), and the exhaust pipe (46) is connected to the condenser tube (2); A purification device (5), one end of the purification device (5) is connected to the second collecting device (4), and the other end is connected to a mixing device (6), and the mixing device (6) is respectively connected to the reactor (1) and the first collecting device (3).

2. A post-crosslinking device for a phenolic melt-blown material according to claim 1, characterized in that: The condenser (2) comprises a first condensation section (21) and a second condensation section (22); a partition (24) is provided between the first condensation section (21) and the second condensation section (22); the condensation temperature of the first condensation section (21) is -20 to -30°C; the first collecting device (3) is connected to a side of the second condensation section (22) away from the second collecting device (4); an air hole (241) is provided on the partition (24); the partition (24) is used to block formaldehyde liquid; and the air hole (241) is used to allow the hydrochloric acid gas to pass through.

3. A post-crosslinking device for a phenolic melt-blown material according to claim 2, characterized in that: The pore (241) has a larger pore diameter at one end close to the reactor (1) than at one end close to the second collecting device (4).

4. A post-crosslinking device for a phenolic melt-blown material according to claim 2, characterized in that: A plurality of spray heads (23) are provided in the second condensation section (22), and the spray heads (23) are arranged at intervals along the axial direction of the condensation tube (2).

5. The post-crosslinking device for a phenolic melt-blown material according to claim 1, characterized in that: The second collecting device (4) comprises a housing (41), a spray assembly (42) and a liquid storage box (43); the spray assembly (42) comprises a spray pipe (421) and a nozzle (422); a plurality of spray pipes (421) are provided, and each spray pipe (421) is provided with a plurality of nozzles (422); the liquid storage box (43) is arranged at the bottom of the housing (41); the liquid storage box (43) comprises a first chamber (431) and a second chamber (432); the first chamber (431) is used to collect the hydrochloric acid solution, and the second chamber (432) is used to collect the hydrochloric acid solution. The chamber (432) is used to store condensate, the first chamber (431) is arranged at the top of the second chamber (432), the spray pipe (421) is connected to the second chamber (432), the exhaust pipe (46) is arranged at the top of the shell (41), the second chamber (432) is provided with a liquid inlet pipe (44), the liquid inlet pipe (44) is used to transport condensate to the liquid storage box (43), the first chamber (431) is connected to a liquid outlet pipe (45), and the liquid outlet pipe (45) is connected to the second collecting device (4).

6. A post-crosslinking device for a phenolic melt-blown material according to claim 1, characterized in that: The first collecting device (3) includes a first vacuum pump, a collecting shell (31) and a temperature control tube (32). The first vacuum pump is connected to the collecting shell (31). The first vacuum pump controls the pressure in the first collecting device (3) to 10-30 mmHg. An interlayer (33) is provided in the collecting shell (31). The temperature control tube (32) is spirally wound in the interlayer (33). A connecting tube (34) is provided on the collecting shell (31). The connecting tube (34) is connected to the purification device (5).

7. A post-crosslinking device for a phenolic melt-blown material according to claim 6, characterized in that: A spiral tube is provided in the connecting tube (34), one end of the spiral tube is connected to the first collecting device (3), and the other end is connected to the purification device (5).

8. The post-crosslinking device for a phenolic melt-blown material according to claim 1, characterized in that: The purification equipment (5) comprises a purification shell, a second vacuum pump and a coil, wherein the coil is wound in the purification shell, and the second vacuum pump is connected to the purification shell, and the second vacuum pump controls the pressure in the purification shell to 50-100 mmHg.

9. The post-crosslinking device for a phenolic melt-blown material according to claim 1, characterized in that: A metering pump is provided between the first collecting device (3) and the mixing device (6), and a metering pump is provided between the purification device (5) and the mixing device (6).

10. The post-crosslinking device for phenolic melt-blown material according to claim 1, characterized in that: Anti-corrosion coatings are provided inside the reactor (1), the condenser (2), the first collecting device (3), the second collecting device (4), the purification device (5) and the mixing device (6).

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