Production device of epoxy primer

Abstract

The utility model discloses an epoxy primer production device, which belongs to the technical field of coating processing and production and comprises a bisphenol F synthesis unit, an outlet of the bisphenol F synthesis unit is connected with a bisphenol F epoxy resin production unit, and an outlet of the bisphenol F epoxy resin production unit is connected with a primer production unit. The bisphenol F synthesis unit further comprises a fixed bed reactor, a circulating liquid outlet of the fixed bed reactor is connected with a pipeline filter, a discharge port of the pipeline filter is connected with a tubular heat exchanger through a circulating pump, and a discharge port of the tubular heat exchanger is connected with a circulating liquid inlet of the fixed bed reactor. And a feeding hole of the rectifying tower is connected with a pipeline between the pipeline filter and the circulating pump. According to the device, continuous production of bisphenol F primer is realized, broken resin and other impurities in condensation reaction liquid are removed, the influence of the impurities on a circulating pump can be avoided, the service life of the circulating pump is prolonged, and the heat exchange efficiency is improved, so that side reactions are reduced, and the content of bisphenol F epoxy resin and the quality of the epoxy primer are improved.

Description

Technical Field

[0001] This utility model relates to the field of coating processing and production technology, specifically to a production device for epoxy primer. Background Technology

[0002] Epoxy primers are highly favored in the industrial field due to their numerous advantages, including corrosion resistance, chemical resistance, wear resistance, thermal stability, and water resistance, and have become an indispensable type of paint in the field of corrosion protection for engineering machinery. As the film-forming substance in epoxy primers, the uniformity of bisphenol F epoxy resin is a crucial factor in ensuring the stable performance of the epoxy primer. Furthermore, the purity of bisphenol F, as the raw material for bisphenol F epoxy resin, is also a key factor affecting the resin's properties.

[0003] The following problems currently exist in the production of epoxy primers:

[0004] 1. During the intermittent production of bisphenol F and bisphenol F epoxy resin, there are significant differences in the quality of different batches of products, which directly affects the performance of epoxy primers. This leads to problems such as cracking and peeling of the epoxy primer during the coating process, shortening the service life of the epoxy primer.

[0005] 2. The three wastes generated in the traditional production of epoxy primers using phenol as a raw material contain a variety of toxic materials, which can cause serious harm to human health and the ecological environment.

[0006] In view of the problems existing in the prior art, this utility model combines years of design and use experience in related fields to design and manufacture an epoxy primer production device to overcome the above defects. Utility Model Content

[0007] To address the problems existing in the prior art, this utility model provides an epoxy primer production device that enables continuous production from bisphenol F to epoxy primer, improving the quality and uniformity of epoxy resin while also enhancing the quality and service life of epoxy primer. Furthermore, it recycles and utilizes the three wastes generated during the production process, preventing serious harm to human health and the ecological environment.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An epoxy primer production apparatus includes a bisphenol F synthesis unit, the outlet of which is connected to a bisphenol F epoxy resin production unit, and the outlet of which is connected to a primer production unit.

[0010] Along the operating direction of the production unit, the bisphenol F synthesis unit includes a distillation column, which is the final unit of the bisphenol F synthesis unit. The outlet of the distillation column is directly connected to a first-stage reactor via a pipeline. The first-stage reactor is the initial unit of the bisphenol F epoxy resin production unit. The bisphenol F epoxy resin production unit also includes a second evaporator, which is the final unit of the bisphenol F epoxy resin production unit. The outlet of the second evaporator is directly connected to a batching tank via a pipeline. The batching tank is the initial unit of the primer production unit.

[0011] The bisphenol F synthesis unit also includes a fixed-bed reactor. The circulating liquid outlet of the fixed-bed reactor is connected to a pipeline filter. The outlet of the pipeline filter is connected to a tubular heat exchanger via a circulating pump. The outlet of the tubular heat exchanger is connected to the circulating liquid inlet of the fixed-bed reactor. The feed inlet of the distillation column is connected to the pipeline between the pipeline filter and the circulating pump.

[0012] Preferably, the circulating liquid outlet and circulating liquid inlet of the fixed bed reactor are respectively located at the bottom and top of the fixed bed reactor, and the fixed bed reactor is filled with cationic resin loaded with heteropolyacid catalyst;

[0013] A mixer is connected above the fixed-bed reactor, and the feed inlet of the mixer is connected to a phenol inlet and a formaldehyde aqueous solution inlet.

[0014] Preferably, the first-stage reactor is provided with an epichlorohydrin inlet and an alkaline inlet, the outlet of the first-stage reactor is connected to a second-stage reactor, the second-stage reactor is provided with an alkaline inlet, and the outlet of the second-stage reactor is connected to a first evaporator.

[0015] Both the first-stage reactor and the second-stage reactor are at least one stage of dynamic tubular reactors, and the dynamic tubular reactor includes a reaction chamber, heat exchange tubes, and a rotating shaft.

[0016] Preferably, the first evaporator is provided with an epichlorohydrin outlet, the heavy fraction outlet of the first evaporator is connected to a purification unit, the outlet of the purification unit is connected to a second evaporator, and the purification unit is used to purify the bisphenol F epoxy resin in the reaction solution.

[0017] Both the first evaporator and the second evaporator are vertical rotary thin-film evaporators.

[0018] Preferably, the refining unit includes a first refining vessel, the inlet of which is connected to the heavy component outlet of the first evaporator. The first refining vessel is provided with a solvent inlet and an alkali inlet. The outlet of the first refining vessel is connected to a first phase separator. The oil phase outlet of the first phase separator is connected to a second refining vessel. The second refining vessel is provided with a pure water inlet. The outlet of the second refining vessel is connected to a second phase separator. The oil phase outlet of the second phase separator is connected to a third refining vessel. The third refining vessel is provided with a diatomaceous earth inlet. The outlet of the third refining vessel is connected to a closed vibrating screen. The outlet of the closed vibrating screen is connected to the inlet of the second evaporator.

[0019] Preferably, the distillation column is provided with a recovery water outlet at the top and a phenol outlet at the upper part of the distillation column. The phenol outlet of the distillation column is connected to a phenol melting tank through a first condenser, and the outlet of the phenol melting tank is connected to the inlet of the mixer through a first metering pump.

[0020] The epichlorohydrin outlet of the first evaporator is connected to an epichlorohydrin storage tank via a second condenser, and the outlet of the epichlorohydrin storage tank is connected to the feed inlet of the first-stage reactor via a second metering pump.

[0021] The second evaporator is provided with a solvent outlet, and the solvent outlet of the second evaporator is connected to a solvent storage tank. The solvent storage tank is connected to the solvent inlet of the first refining kettle through a third metering pump.

[0022] Preferably, the aqueous phase outlets of the first phase separator and the second phase separator are both connected to a triple-effect evaporation reactor.

[0023] Preferably, the triple-effect evaporator includes a first-stage evaporator, a second-stage evaporator, and a third-stage evaporator connected in sequence. Each stage of the evaporator includes a heating chamber and a separation chamber connected in sequence. The heating chamber is provided with a heat medium inlet, and the separation chamber is provided with a steam outlet and a concentrate outlet.

[0024] The steam outlet of the separation chamber is connected to the heat medium inlet of the next-stage heating chamber. The concentrated liquid outlet of the separation chamber is connected to the feed inlet of the same-stage heating chamber and the feed inlet of the next-stage heating chamber. The concentrated liquid outlet of the third-stage separation chamber is connected to the feed inlet of the same-stage heating chamber. The concentrated liquid outlet of the third-stage separation chamber is also connected to a waste salt storage tank.

[0025] Preferably, the primer production unit further includes a first dispersion vessel connected to the outlet of the mixing tank, the outlet of the first dispersion vessel being connected to a grinder, the outlet of the grinder being connected to a second dispersion vessel, the outlet of the second dispersion vessel being connected to a filter, and the outlet of the filter being connected to a filling machine.

[0026] Preferably, the grinding mill is a three-roll mill;

[0027] The filter is a double-layer filter.

[0028] The advantages of this utility model are:

[0029] 1. This utility model achieves continuous production of epoxy primer by linking the three processes of bisphenol F synthesis, bisphenol F epoxy resin synthesis and primer preparation, ensuring stable production of bisphenol F and bisphenol F epoxy resin, improving the quality of bisphenol F epoxy resin, and thus obtaining a high-performance epoxy primer.

[0030] 2. This invention produces bisphenol F using a fixed-bed reactor, avoiding the problems caused by acidic catalysts, such as complex operation, large amounts of waste, severe equipment corrosion, and difficult product separation. By connecting a pipeline filter to the fixed-bed reactor, the wear of process equipment caused by impurities such as solid particles and colloidal substances in bisphenol F is reduced, extending the service life of the equipment and improving the quality of bisphenol F. The use of a tubular heat exchanger improves the heat exchange efficiency of the condensation reaction, ensures the stability of the condensation reaction, avoids the occurrence of side reactions, further improves the quality of bisphenol F, and thus improves the performance of epoxy primer. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a production apparatus for epoxy primer.

[0032] Figure 2 This is a schematic diagram of the device used in Embodiment 1 of this utility model.

[0033] Figure 3 This is a schematic diagram of the device used in Embodiment 2 of this utility model.

[0034] Figure 4 This is a schematic diagram of the device used in Embodiment 3 of this utility model.

[0035] Figure 5 This is a schematic diagram of the device used in Embodiment 4 of this utility model.

[0036] Figure 6 This is a schematic diagram of the structure of the triple-effect evaporator used in Embodiment 4 of this utility model.

[0037] In the diagram: 1-Condensation reactor, 2-Distillation column, 3-First stage reactor, 4-Second stage reactor, 5-First evaporator, 6-Refining unit, 7-Second evaporator, 8-Battery tank, 9-First dispersion vessel, 10-Grinding mill, 11-Second dispersion vessel, 12-Filter, 13-Filling machine, 14-Bisphenol F synthesis unit, 15-Bisphenol F epoxy resin production unit, 16-Primer production unit, 21-First condenser, 51-Second condenser, 52-Epoxychloropropane storage tank, 53-Second metering pump, 61-First refining vessel, 62-First phase separator, 63-Second refining vessel, 64-Second phase separator, 65 - Third refining vessel, 66- Closed vibrating screen, 71- Solvent storage tank, 72- Third metering pump, 101- Mixer, 102- Pipeline filter, 103- Circulation pump, 104- Tubular heat exchanger, 105- Fixed bed reactor, 106- Phenol melting tank, 107- First metering pump, A- Triple-effect evaporator, A1- First-stage evaporator, A2- Second-stage evaporator, A3- Third-stage evaporator, A11- First heating chamber, A12- First separation chamber, A21- Second heating chamber, A22- Second separation chamber, A31- Third heating chamber, A32- Third separation chamber, A4- Waste salt storage tank. Detailed Implementation

[0038] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0039] An epoxy primer production apparatus, as described above Figure 1 This includes a bisphenol F synthesis unit 14, the outlet of which is connected to a bisphenol F epoxy resin production unit 15, and the outlet of the bisphenol F epoxy resin production unit 15 is connected to a primer production unit 16. Along the operating direction of the production unit, refer to... Figure 2 The bisphenol F synthesis unit 14 includes a distillation column 2, which is the final stage unit of the bisphenol F synthesis unit 14. The bottom outlet of the distillation column 2 is directly connected to a first-stage reactor 3 via a pipeline. The first-stage reactor 3 is the initial stage unit of the bisphenol F epoxy resin production unit 15. The bisphenol F epoxy resin production unit 15 also includes a second evaporator 7, which is the final stage unit of the bisphenol F epoxy resin production unit 15. The outlet of the second evaporator 7 is directly connected to a mixing tank 8 via a pipeline. The mixing tank 8 is the initial stage unit of the primer production unit 16. This invention connects the three processes of bisphenol F synthesis, bisphenol F epoxy resin synthesis, and primer preparation, achieving continuous production from phenol and formaldehyde aqueous solution raw materials to epoxy primer. This ensures stable production of bisphenol F and bisphenol F epoxy resin, improves the quality of bisphenol F epoxy resin, and thus produces a high-performance epoxy primer. This reduces paint film problems such as cracking and peeling during the coating process and extends the service life of the epoxy primer.

[0040] Bisphenol F synthesis unit 14 also includes condensation reactor 1, see reference Figure 2 The outlet of condensation reactor 1 is connected to the inlet of distillation column 2. Condensation reactor 1 is equipped with a phenol inlet and a formaldehyde aqueous solution inlet. To improve reaction efficiency and enhance the quality of bisphenol F, the condensation reactor 1 in the production apparatus provided by this invention includes a fixed-bed reactor 105. The fixed-bed reactor 105 contains cationic resin loaded with a heteropolyacid catalyst. A mixer 101 is connected above the fixed-bed reactor 105, and the mixer 101 is equipped with an inlet connected to both the phenol inlet and the formaldehyde aqueous solution inlet. In this invention, before the phenol and formaldehyde aqueous solution enter the fixed-bed reactor 105 for the condensation reaction, they are first mixed in the mixer 101, resulting in more uniform mixing of the raw materials.

[0041] The fixed-bed reactor 105 of this invention has a circulating liquid inlet at the top and a circulating liquid outlet at the bottom. The circulating liquid outlet of the fixed-bed reactor 105 is connected to a pipeline filter 102, the outlet of the pipeline filter 102 is connected to a circulating pump 103, the outlet of the circulating pump 103 is connected to a tubular heat exchanger 104, and the outlet of the tubular heat exchanger 104 is connected to the circulating liquid inlet of the fixed-bed reactor 105. The inlet of the distillation column 2 is connected to the pipeline between the pipeline filter 102 and the circulating pump 103. This design accelerates circulation, improves production efficiency, and ensures the purity of bisphenol F.

[0042] Specifically, this invention utilizes a fixed-bed reactor 105 for the condensation reaction, which accelerates the reaction rate and avoids problems such as complex operation, high waste volume, severe equipment corrosion, and difficult product separation caused by acidic catalysts. The pipeline filter 102 removes broken resin and other impurities, preventing impurities from affecting the circulating pump 103 and extending its lifespan. Since the fixed-bed reactor 105 contains a catalyst, its heat exchange efficiency is low. By adding an external tubular heat exchanger 104 for circulating heat exchange, the heat exchange efficiency is improved. The filtrate, after being heated by the tubular heat exchanger 104, returns to the fixed-bed reactor 105, cooling the condensation reaction liquid and cationic resin in the reactor, thereby reducing side reactions. Unreacted raw materials in the filtrate continue the condensation reaction, improving raw material utilization. This invention accelerates the reaction while improving heat exchange efficiency; both factors work together to ensure the purity of bisphenol F, increase the bisphenol F epoxy resin content, and thus improve the quality of the epoxy primer. After being filtered by pipeline filter 102, the condensation reaction liquid enters the distillation column 2 for distillation. The heavy component bisphenol F after distillation enters the bisphenol F epoxy resin production unit 15 from the outlet of the distillation column 2.

[0043] In this invention, the first-stage reactor 3 of the bisphenol F epoxy resin production unit 15 is equipped with an epichlorohydrin inlet and an alkali inlet. The outlet of the first-stage reactor 3 is connected to a second-stage reactor 4, which is equipped with an alkali inlet. The outlet of the second-stage reactor 4 is connected to a first evaporator 5. Specifically, in the first-stage reactor 3, bisphenol F undergoes an etherification reaction with epichlorohydrin under the catalysis of the alkali solution to obtain an etherified reaction solution. The etherified reaction solution enters the second-stage reactor 4 and undergoes a ring-closure reaction under the action of the alkali solution to obtain a ring-closure reaction solution containing bisphenol F epoxy resin.

[0044] Specifically, the first-stage reactor 3 and the second-stage reactor 4 are preferably at least one-stage dynamic tubular reactors. More preferably, the first-stage reactor 3 and the second-stage reactor 4 are either single-stage dynamic tubular reactors or two-stage dynamic tubular reactors connected in series. In this invention, the dynamic tubular reactor consists of a reaction chamber, heat exchange tubes, a rotating shaft, etc. The reaction chamber is the site of material reaction, the heat exchange tubes circulate the heat exchange medium, and the rotating shaft can be used to enhance radial velocity. The material flows and undergoes a chemical reaction in the reaction chamber, the spiral shaft promotes the mixing of the material, and the material flows out of the dynamic tubular reactor after the reaction is completed.

[0045] When the first-stage reactor 3 is a single-stage dynamic tubular reactor, its inlet is the same as the inlet of the dynamic tubular reactor, and its outlet is the same as the outlet of the dynamic tubular reactor. When the first-stage reactor 3 is a series-connected two-stage dynamic tubular reactor, its inlet is the same as the inlet of the first-stage dynamic tubular reactor, and its outlet is the same as the outlet of the second-stage dynamic tubular reactor.

[0046] Similarly, when the second-stage reactor 4 is a single-stage dynamic tubular reactor, the inlet of the second-stage reactor 4 is the same as the inlet of the dynamic tubular reactor, and the outlet of the second-stage reactor 4 is the same as the outlet of the dynamic tubular reactor. When the second-stage reactor 4 is a series-connected two-stage dynamic tubular reactor, the inlet of the second-stage reactor 4 is the same as the inlet of the first-stage dynamic tubular reactor, and the outlet of the second-stage reactor 4 is the same as the outlet of the second-stage dynamic tubular reactor.

[0047] The first evaporator 5 has an epichlorohydrin outlet at its top. The heavy fraction outlet of the first evaporator 5 is connected to a purification unit 6, which is used to purify the bisphenol F epoxy resin in the reaction solution. The outlet of the purification unit 6 is connected to the second evaporator 7, which has a solvent outlet at its top.

[0048] Specifically, both the first evaporator 5 and the second evaporator 7 are vertical rotary thin-film evaporators. The vertical rotary thin-film evaporator uses a rotating scraping device inside the cylinder to force the material to form a film continuously and uniformly on the heating surface. It performs falling film evaporation under vacuum conditions. In the evaporator, the material flow and the secondary evaporation vapor flow are two independent channels. The negative pressure environment of the evaporator can lower the boiling point of the material, thereby distilling out epichlorohydrin and solvent at a lower temperature.

[0049] See Figure 3 In this invention, the refining unit 6 includes a first refining vessel 61. The inlet of the first refining vessel 61 is connected to the heavy component outlet of the first evaporator 5. The first refining vessel 61 is equipped with a solvent inlet and an alkali inlet. The outlet of the first refining vessel 61 is connected to a first phase separator 62. The oil phase outlet of the first phase separator 62 is connected to a second refining vessel 63, which is equipped with a pure water inlet. The outlet of the second refining vessel 63 is connected to a second phase separator 64. The oil phase outlet of the second phase separator 64 is connected to a third refining vessel 65. The third refining vessel 65 is equipped with a diatomaceous earth inlet. The outlet of the third refining vessel 65 is connected to a closed vibrating screen 66, and the outlet of the closed vibrating screen 66 is connected to the inlet of the second evaporator 7.

[0050] This invention involves adding a solvent to a first refining vessel 61 to dissolve the bisphenol F epoxy resin in the first heavy component, and adding an alkaline solution to neutralize the acidic impurities mixed in the bisphenol F epoxy resin, forming a salt that dissolves in the aqueous phase. A first phase separator 62 separates the first aqueous phase containing salt wastewater and a first oil phase containing bisphenol F epoxy resin. The separated first oil phase enters a second refining vessel 63. In the second refining vessel 63, pure water is used to wash away the small amount of salt mixed in the first oil phase. A second phase separator 64 separates the received material into a second aqueous phase washing wastewater and a second oil phase. The second oil phase enters a third refining vessel 65. In the third refining vessel 65, diatomaceous earth is used to adsorb impurities such as aged resin and organic pigments in the second oil phase, which is then transferred to a closed vibrating screen 66. The closed vibrating screen 66 separates the waste diatomaceous earth from the refining liquid containing bisphenol F epoxy resin, thus completing the purification of the bisphenol F epoxy resin.

[0051] To improve the utilization rate of phenol, epichlorohydrin, and solvents, reduce waste liquid volume, and lower production costs, as a preferred technical solution of this utility model, see [link to relevant documentation]. Figure 4The distillation column 2 has a recovery water outlet at its top and a phenol outlet at its upper part. The phenol outlet of the distillation column 2 is connected to a phenol melting tank 106 via a first condenser 21. The outlet of the phenol melting tank 106 is connected to the inlet of the mixer 101 via a first metering pump 107. The epichlorohydrin outlet of the first evaporator 5 is connected to an epichlorohydrin storage tank 52 via a second condenser 51. The outlet of the epichlorohydrin storage tank 52 is connected to the epichlorohydrin inlet of the first-stage reactor 3 via a second metering pump 53. The solvent outlet of the second evaporator 7 is connected to a solvent storage tank 71. The solvent storage tank 71 is connected to the solvent inlet of the first refining vessel 61 via a third metering pump 72.

[0052] To recover salt from wastewater, reduce wastewater treatment costs, minimize environmental pollution, and comprehensively utilize the thermal energy of steam to improve thermodynamic efficiency, see [reference needed]. Figure 5 , Figure 6 The aqueous phase outlets of the first phase separator 62 and the second phase separator 64 are connected to a triple-effect evaporator A. The triple-effect evaporator A includes a first-stage evaporator A1, a second-stage evaporator A2, and a third-stage evaporator A3 connected in sequence. Each stage of the evaporator includes a heating chamber and a separation chamber connected in sequence. The heating chamber has a heat transfer medium inlet, and the separation chamber has a steam outlet and a concentrate outlet. The steam outlet of the separation chamber is connected to the heat transfer medium inlet of the next-stage heating chamber. The concentrate outlet of the separation chamber is connected to the feed inlet of the same-stage heating chamber and the feed inlet of the next-stage heating chamber, respectively. The concentrate outlet of the separation chamber of the third-stage evaporator A3 is connected to the feed inlet of the same-stage heating chamber. The concentrate outlet of the separation chamber of the third-stage evaporator A3 is also connected to a waste salt storage tank A4.

[0053] For details, see Figure 5 , Figure 6The aqueous phase outlets of both the first phase separator 62 and the second phase separator 64 are connected to the inlet of the first heating chamber A11. The outlet of the first heating chamber A11 is connected to the inlet of the first separation chamber A12. The steam outlet of the first separation chamber A12 is connected to the heat medium inlet of the second heating chamber A21. The steam separated from the first separation chamber A12 serves as the heat medium for the second heating chamber A21. The concentrated liquid outlet of the first separation chamber A12 is connected to both the inlet of the first heating chamber A11 and the inlet of the second heating chamber A21. The outlet of the second heating chamber A21 is connected to the inlet of the second separation chamber A22. A portion of the concentrated liquid separated from the first separation chamber A12 is forcibly circulated within the first heating chamber A11 and the first separation chamber A12, while a portion enters the second heating chamber A21, is heated by the steam from the first separation chamber A12, and then enters the second separation chamber A22 for further separation. Similarly, the steam outlet of the second separation chamber A22 is connected to the heat medium inlet of the third heating chamber A31. The concentrate outlet of the second separation chamber A22 is connected to both the feed inlet of the second heating chamber A21 and the feed inlet of the third heating chamber A31. The discharge outlet of the third heating chamber A31 is connected to the feed inlet of the third separation chamber A32. The concentrate outlet of the third separation chamber A32 is connected to both the feed inlet of the third heating chamber A31 and the feed inlet of the waste salt storage tank A4. A portion of the concentrate separated from the third separation chamber A32 enters the third heating chamber A31, where it undergoes forced circulation within both chambers. A portion is stored in the waste salt storage tank A4.

[0054] The primer production unit 16 also includes a first dispersion vessel 9 connected to the outlet of the mixing tank 8. A grinder 10 is connected to the outlet of the first dispersion vessel 9. A second dispersion vessel 11 is connected to the outlet of the grinder 10. A filter 12 is connected to the outlet of the second dispersion vessel 11. A filling machine 13 is connected to the outlet of the filter 12. Specifically, additives, pigments, and fillers are added to the first dispersion vessel 9 and dispersed at high speed to obtain a first dispersion. The second dispersion vessel 11 is used to further disperse the material evenly under the action of the added additives, adjusting viscosity, sagging, and other parameters. The filter 12 is used to filter out colloidal particles and mechanical impurities.

[0055] In the production apparatus provided by this utility model, the grinding mill 10 is preferably a three-roll grinding mill. The three-roll grinding mill is composed of a base, a guide cover, a roller bearing seat, a feeding copper knife, and a discharge blade. The first dispersion liquid obtained in the first dispersion kettle 9 enters the three-roll grinding mill, and the grinding effect is achieved by the mutual extrusion of the surfaces of the three horizontal rollers and the friction at different speeds.

[0056] The filter 12 is preferably a dual-layer filter, which has two filter layers. The pore size of the upper filter layer is larger than that of the lower filter layer. The quality of the epoxy primer is improved by filtering twice.

[0057] In this invention, the alkaline solution is either sodium hydroxide solution or potassium hydroxide solution; the solvent is methyl isobutyl ketone; and the additives are a variety of rheology control additives, cosolvents, dispersants, defoamers, leveling agents, and epoxy drying agents.

[0058] This invention connects the production process of epoxy primer using phenol as a raw material, achieving continuous production of bisphenol F, bisphenol F epoxy resin, and epoxy primer, thereby obtaining epoxy primer of uniform quality. All waste generated during the production process is effectively utilized, and will not cause harm to human health or the ecological environment.

[0059] In this utility model, unless otherwise explicitly specified or limited, the connection method between the units or devices should be interpreted broadly. For example, it can be a direct pipeline connection, or it can be a pipeline connection through conventional conveying, metering, control, and temporary storage equipment such as pumping equipment, metering equipment, valves and fittings, and intermediate tanks. It can be a fixed connection or a detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In this invention, the various components of the production apparatus, such as mixers, fixed-bed reactors, pipeline filters, circulating pumps, dynamic tubular reactors, distillation columns, evaporators, phase separators, closed vibrating screens, batching tanks, dispersion kettles, grinders, filters, filling machines, as well as pipe fittings, valves, controllers, feed pumps, etc., can all be purchased from the market. However, the entire reaction apparatus cannot be purchased from the market and is not known to those skilled in the art.

[0061] Example 1

[0062] This embodiment provides a production apparatus for epoxy primer, the structural schematic diagram of which is shown below. Figure 1 , Figure 2 As shown, it includes a bisphenol F synthesis unit 14, a bisphenol F epoxy resin production unit 15, and a primer production unit 16 connected in sequence.

[0063] The condensation reactor 1 includes a mixer 101 and a fixed-bed reactor 105 connected in series. The inlet of the mixer 101 is connected to both the phenol inlet and the formaldehyde aqueous solution inlet. The outlet of the fixed-bed reactor 105 is connected to the inlet of a pipe filter 102, which is in turn connected to the inlet of a circulating pump 103. The outlet of the circulating pump 103 is connected to the inlet of a tubular heat exchanger 104, which is in turn connected to the circulating liquid inlet of the fixed-bed reactor 105. The fixed-bed reactor 105 contains a cationic resin loaded with a heteropolyacid catalyst. The inlet of the distillation column 2 is connected to the pipe between the pipe filter 102 and the circulating pump 103. A recovery water outlet is provided at the top of the distillation column 2, and a phenol outlet is provided on the upper side of the distillation column 2. The bottom outlet of the distillation column 2 is connected to the inlet of the first-stage reactor 3.

[0064] The first-stage reactor 3 is also equipped with an epichlorohydrin inlet and an alkali inlet. The outlet of the first-stage reactor 3 is connected to the inlet of the second-stage reactor 4. The second-stage reactor 4 is also equipped with an alkali inlet. The outlet of the second-stage reactor 4 is connected to the inlet of the first evaporator 5. The top of the first evaporator 5 is equipped with an epichlorohydrin outlet. The heavy component outlet of the first evaporator 5 is connected to the inlet of the refining unit 6. The outlet of the refining unit 6 is connected to the inlet of the second evaporator 7. The top of the second evaporator 7 is equipped with a solvent outlet. The heavy component outlet of the second evaporator 7 is connected to the inlet of the mixing tank 8. The outlet of the mixing tank 8 is connected to the inlet of the first dispersion vessel 9. The outlet of the first dispersion vessel 9 is connected to the inlet of the grinder 10. The outlet of the grinder 10 is connected to the inlet of the second dispersion vessel 11. The outlet of the second dispersion vessel 11 is connected to the inlet of the filter 12. The outlet of the filter 12 is connected to the inlet of the filling machine 13. Among them, the first-stage reactor 3 and the second-stage reactor 4 are both two-stage dynamic tubular reactors connected in series, the first evaporator 5 and the second evaporator 7 are both vertical rotary thin-film evaporators, the grinder 10 is a three-roll grinder, and the filter 12 is a double-layer filter.

[0065] The specific operation process is as follows:

[0066] Bisphenol F Synthesis Unit 14: Phenol and formaldehyde aqueous solution are pumped into mixer 101 in a certain proportion to obtain a mixed solution. The mixed solution enters fixed-bed reactor 105, where phenol and formaldehyde undergo a condensation reaction under the catalysis of cationic resin supported on heteropolyacid catalyst to obtain a condensation reaction solution containing bisphenol F. The condensation reaction solution is filtered through pipeline filter 102 to remove broken resin and other impurities to obtain filtrate. Part of the filtrate is pumped into tubular heat exchanger 104 by circulating pump 103 for heat exchange and then returned to fixed-bed reactor 105 through the circulating liquid inlet. Part of the filtrate, as the condensation reaction solution, flows into distillation column 2 from the connecting pipeline between pipeline filter 102 and circulating pump 103 for distillation. Water in the condensation reaction solution is separated at the recovery water outlet at the top of distillation column 2. Phenol that did not participate in the condensation reaction is recovered at the phenol outlet on the upper side line of distillation column 2. The heavy component bisphenol F is obtained at the bottom outlet of distillation column 2.

[0067] Bisphenol F epoxy resin production unit 15: Bisphenol F enters the first-stage reactor 3, which is composed of a two-stage dynamic tubular reactor. At the same time, epichlorohydrin and alkaline solution enter the first-stage reactor 3 through the epichlorohydrin inlet and the alkaline solution inlet, respectively. In the first-stage reactor 3, bisphenol F undergoes an etherification reaction with epichlorohydrin under the catalysis of the alkaline solution to obtain an etherified reaction solution. The etherified reaction solution enters the second-stage reactor 4, which is composed of a two-stage dynamic tubular reactor. Under the action of the simultaneously added alkaline solution, a closed-loop reaction occurs to obtain a closed-loop reaction solution containing bisphenol F epoxy resin. The closed-loop reaction solution is passed through the first evaporator 5, which is composed of a vertical rotary thin film evaporator, to recover epichlorohydrin. The first heavy component obtained after recovering epichlorohydrin enters the purification unit 6. In the purification unit 6, the first heavy component is extracted and impurities are removed by adding solvent. The purified solution obtained after purification and impurity removal in the purification unit 6 enters the second evaporator 7, which is composed of a vertical rotary thin film evaporator, to recover the solvent introduced in the purification unit 6.

[0068] Primer production unit 16: The second heavy component, bisphenol F epoxy resin, obtained after solvent removal by the second evaporator 7, enters the mixing tank 8. At the same time, additives are added to the mixing tank 8. After stirring evenly, it is pumped into the first dispersion tank 9 by a metering pump. Additives, pigments and fillers are added to the first dispersion tank 9 in sequence. After high-speed dispersion, the first dispersion is obtained. The first dispersion is transferred to the grinding mill 10 composed of a three-roll mill. After grinding to the qualified fineness, it is transferred to the second dispersion tank 11. After being dispersed evenly again with the additives added in the second dispersion tank 11, the viscosity, sag and other indicators are adjusted. After being fully dispersed evenly, it is filtered by the filter 12 composed of a double-layer filter to remove the glue particles and mechanical impurities. Then it is filled by the filling machine 13 to obtain the packaged epoxy primer.

[0069] Example 2

[0070] This embodiment provides a production apparatus for epoxy primer, the structural schematic diagram of which is shown below. Figure 3 As shown, the difference from Embodiment 1 is that the refining unit 6 in this embodiment includes a first refining kettle 61, a first phase separator 62, a second refining kettle 63, a second phase separator 64, a third refining kettle 65, and a closed vibrating screen 66 connected in sequence. The first evaporator 5 has its heavy component outlet connected to the inlet of the first refining vessel 61. The first refining vessel 61 is also equipped with a solvent inlet and an alkali inlet. The outlet of the first refining vessel 61 is connected to the inlet of the first phase separator 62. The oil phase outlet of the first phase separator 62 is connected to the inlet of the second refining vessel 63. The second refining vessel 63 is also equipped with a pure water inlet. The outlet of the second refining vessel 63 is connected to the inlet of the second phase separator 64. The oil phase outlet of the second phase separator 64 is connected to the inlet of the third refining vessel 65. The third refining vessel 65 is also equipped with a diatomaceous earth inlet. The outlet of the third refining vessel 65 is connected to the inlet of the closed vibrating screen 66. The outlet of the closed vibrating screen 66 is connected to the inlet of the second evaporator 7.

[0071] Based on Example 1, the first heavy component containing bisphenol F epoxy resin obtained after recovering epichlorohydrin in the first evaporator 5 enters the first refining kettle 61. Simultaneously, solvent is added through the solvent inlet of the first refining kettle 61, and alkali solution is added through the alkali solution inlet of the first refining kettle 61. The bisphenol F epoxy resin in the first heavy component dissolves in the solvent. Acidic impurities mixed in the bisphenol F epoxy resin are neutralized by the alkali solution to form salts, which then dissolve in the aqueous phase. After extraction and impurity removal in the first refining kettle 61, the first heavy component enters the first phase separator 62 to separate the first aqueous phase containing saline wastewater and the first oil phase containing bisphenol F epoxy resin. The separated first... The oil phase enters the second refining reactor 63, where pure water is used to wash and dissolve the small amount of salt mixed in the first oil phase. Then, it is transferred to the second phase separator 64 to separate the second aqueous phase washing wastewater and the second oil phase. The obtained second oil phase enters the third refining reactor 65, where diatomaceous earth is used to adsorb impurities such as aged resin and organic pigments in the second oil phase. The oil phase is then transferred to a closed vibrating screen 66, where the waste diatomaceous earth and the refined liquid containing bisphenol F epoxy resin are separated. The refined liquid enters the second evaporator 7 to recover the solvent introduced through the first refining reactor 61 and obtain bisphenol F epoxy resin.

[0072] Example 3

[0073] This embodiment provides a production apparatus for epoxy primer, the structural schematic diagram of which is shown below. Figure 4 As shown, the difference from Example 2 is that this example includes a first condenser 21, a phenol melting tank 106, a first metering pump 107, a second condenser 51, an epichlorohydrin storage tank 52, a second metering pump 53, a solvent storage tank 71, and a third metering pump 72.

[0074] Specifically, the phenol outlet of the upper side stream of distillation column 2 is connected to the inlet of phenol melting tank 106 via the first condenser 21, the outlet of phenol melting tank 106 is connected to the feed inlet of mixer 101 via the first metering pump 107, the epichlorohydrin outlet of the first evaporator 5 is connected to the inlet of epichlorohydrin storage tank 52 via the second condenser 51, the outlet of epichlorohydrin storage tank 52 is connected to the epichlorohydrin inlet of the first stage reactor 3 via the second metering pump 53, the solvent outlet of the second evaporator 7 is connected to the inlet of solvent storage tank 71, and the outlet of solvent storage tank 71 is connected to the solvent inlet of the first refining vessel 61 via the third metering pump 72.

[0075] Based on Example 2, the condensation reaction liquid obtained from the condensation reactor 1 is distilled into the distillation column 2. The phenol vapor obtained at the phenol outlet of the upper side stream of the distillation column 2 is condensed by the first condenser 21 and collected in the phenol melt tank 106. It is then transported to the condensation reactor 1 by the first metering pump 107 to participate in the condensation reaction. The epichlorohydrin vapor obtained after the closed-loop reaction liquid is evaporated by the first evaporator 5 is condensed by the second condenser 51 and collected in the epichlorohydrin storage tank 52. It is then pumped into the first-stage reactor 3 by the second metering pump 53 to participate in the etherification reaction. The solvent recovered by the evaporation of the purified liquid by the second evaporator 7 is collected in the solvent storage tank 71 and pumped into the first purification vessel 61 by the third metering pump 72 to purify the first heavy components.

[0076] Example 4

[0077] This embodiment provides a production apparatus for epoxy primer, the structural schematic diagram of which is shown below. Figure 5 As shown, the difference from Example 3 is that a triple-effect evaporator A is provided in this example, and its structural schematic diagram is shown below. Figure 6 As shown, the triple-effect evaporator A includes a first-stage evaporator A1, a second-stage evaporator A2, a third-stage evaporator A3, and a waste salt storage tank A4. Each stage of the evaporator consists of a heating chamber and a separation chamber. The heating chamber is equipped with a heat transfer medium inlet, and the separation chamber is equipped with a steam outlet and a concentrated liquid outlet.

[0078] The aqueous phase outlets of the first phase separator 62 and the second phase separator 64 are both connected to the inlet of the first heating chamber A11. The outlet of the first heating chamber A11 is connected to the inlet of the first separation chamber A12. The steam outlet of the first separation chamber A12 is connected to the heat medium inlet of the second heating chamber A21. The concentrated liquid outlet of the first separation chamber A12 is connected to both the inlet of the first heating chamber A11 and the inlet of the second heating chamber A21. The outlet of the second heating chamber A21 is connected to... The feed inlet of the second separation chamber A22 is connected to the steam outlet of the second separation chamber A22 and the heat medium inlet of the third heating chamber A31. The concentrate outlet of the second separation chamber A22 is connected to the feed inlet of the second heating chamber A21 and the feed inlet of the third heating chamber A31. The discharge outlet of the third heating chamber A31 is connected to the feed inlet of the third separation chamber A32. The concentrate outlet of the third separation chamber A32 is connected to the feed inlet of the third heating chamber A31 and the feed inlet of the waste salt storage tank A4.

[0079] Based on Example 4, the saline wastewater separated by the first phase separator 62 and the washing wastewater separated by the second phase separator 64 enter the first heating chamber A11. After being heated in the first heating chamber A11, they enter the first separation chamber A12 for separation. The steam separated from the first separation chamber A12 is used as the heat medium for the second heating chamber A21. Part of the concentrated liquid separated from the first separation chamber A12 returns to the first heating chamber A11. It is forcibly circulated in the first heating chamber A11 and the first separation chamber A12. Part of it enters the second heating chamber A21 and is heated by the steam from the first separation chamber A12 before entering the second separation chamber A22 for separation. The steam separated from the second separation chamber A22 is used as the heat medium for the third heating chamber A31. Part of the concentrated liquid separated from the second separation chamber A22 enters the second heating chamber A21 and is forcibly circulated within the second heating chamber A21 and the second separation chamber A22. Part of it enters the third heating chamber A31 and is heated by the steam from the second separation chamber A22 before entering the third separation chamber A32 for separation. Part of the concentrated liquid separated from the third separation chamber A32 enters the third heating chamber A31 and is forcibly circulated within the third heating chamber A31 and the third separation chamber A32. Part of it enters the waste salt storage tank A4 for storage.

[0080] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. An apparatus for producing epoxy primer, characterized in that, It includes a bisphenol F synthesis unit, the outlet of which is connected to a bisphenol F epoxy resin production unit, and the outlet of which is connected to a primer production unit. Along the operating direction of the production unit, the bisphenol F synthesis unit includes a distillation column, which is the final unit of the bisphenol F synthesis unit. The outlet of the distillation column is directly connected to a first-stage reactor via a pipeline. The first-stage reactor is the initial unit of the bisphenol F epoxy resin production unit. The bisphenol F epoxy resin production unit also includes a second evaporator, which is the final unit of the bisphenol F epoxy resin production unit. The outlet of the second evaporator is directly connected to a batching tank via a pipeline. The batching tank is the initial unit of the primer production unit. The bisphenol F synthesis unit also includes a fixed-bed reactor. The circulating liquid outlet of the fixed-bed reactor is connected to a pipeline filter. The outlet of the pipeline filter is connected to a tubular heat exchanger via a circulating pump. The outlet of the tubular heat exchanger is connected to the circulating liquid inlet of the fixed-bed reactor. The feed inlet of the distillation column is connected to the pipeline between the pipeline filter and the circulating pump.

2. The epoxy primer production apparatus according to claim 1, characterized in that, The circulating liquid outlet and circulating liquid inlet of the fixed bed reactor are respectively located at the bottom and top of the fixed bed reactor, and the fixed bed reactor contains a cationic resin loaded with a heteropolyacid catalyst. A mixer is connected above the fixed-bed reactor, and the feed inlet of the mixer is connected to a phenol inlet and a formaldehyde aqueous solution inlet.

3. The epoxy primer production apparatus according to claim 2, characterized in that, The first-stage reactor is equipped with an epichlorohydrin inlet and an alkaline inlet. The outlet of the first-stage reactor is connected to a second-stage reactor, which is equipped with an alkaline inlet. The outlet of the second-stage reactor is connected to a first evaporator. Both the first-stage reactor and the second-stage reactor are at least one stage of dynamic tubular reactors, and the dynamic tubular reactor includes a reaction chamber, heat exchange tubes, and a rotating shaft.

4. The epoxy primer production apparatus according to claim 3, characterized in that, The first evaporator is provided with an epichlorohydrin outlet, and the heavy separation outlet of the first evaporator is connected to a purification unit. The outlet of the purification unit is connected to the second evaporator. The purification unit is used to purify the bisphenol F epoxy resin in the reaction solution. Both the first evaporator and the second evaporator are vertical rotary thin-film evaporators.

5. The epoxy primer production apparatus according to claim 4, characterized in that, The refining unit includes a first refining vessel, the inlet of which is connected to the heavy component outlet of the first evaporator. The first refining vessel is equipped with a solvent inlet and an alkali inlet. The outlet of the first refining vessel is connected to a first phase separator. The oil phase outlet of the first phase separator is connected to a second refining vessel. The second refining vessel is equipped with a pure water inlet. The outlet of the second refining vessel is connected to a second phase separator. The oil phase outlet of the second phase separator is connected to a third refining vessel. The third refining vessel is equipped with a diatomaceous earth inlet. The outlet of the third refining vessel is connected to a closed vibrating screen. The outlet of the closed vibrating screen is connected to the inlet of the second evaporator.

6. The epoxy primer production apparatus according to claim 5, characterized in that, The distillation column is provided with a recovery water outlet at the top and a phenol outlet at the top. The phenol outlet of the distillation column is connected to a phenol melting tank through a first condenser. The outlet of the phenol melting tank is connected to the inlet of the mixer through a first metering pump. The epichlorohydrin outlet of the first evaporator is connected to an epichlorohydrin storage tank via a second condenser, and the outlet of the epichlorohydrin storage tank is connected to the feed inlet of the first-stage reactor via a second metering pump. The second evaporator is provided with a solvent outlet, and the solvent outlet of the second evaporator is connected to a solvent storage tank. The solvent storage tank is connected to the solvent inlet of the first refining kettle through a third metering pump.

7. The epoxy primer production apparatus according to claim 5, characterized in that, The aqueous phase outlets of the first phase separator and the second phase separator are both connected to a triple-effect evaporation reactor.

8. The epoxy primer production apparatus according to claim 7, characterized in that, The triple-effect evaporator includes a first-stage evaporator, a second-stage evaporator, and a third-stage evaporator connected in sequence. Each stage of the evaporator includes a heating chamber and a separation chamber connected in sequence. The heating chamber is provided with a heat medium inlet, and the separation chamber is provided with a steam outlet and a concentrate outlet. The steam outlet of the separation chamber is connected to the heat medium inlet of the next-stage heating chamber. The concentrated liquid outlet of the separation chamber is connected to the feed inlet of the same-stage heating chamber and the feed inlet of the next-stage heating chamber. The concentrated liquid outlet of the third-stage separation chamber is connected to the feed inlet of the same-stage heating chamber. The concentrated liquid outlet of the third-stage separation chamber is also connected to a waste salt storage tank.

9. An epoxy primer production apparatus according to any one of claims 1-8, characterized in that, The primer production unit also includes a first dispersion vessel connected to the outlet of the mixing tank, a grinding mill connected to the outlet of the first dispersion vessel, a second dispersion vessel connected to the outlet of the grinding mill, a filter connected to the outlet of the second dispersion vessel, and a filling machine connected to the outlet of the filter.

10. The epoxy primer production apparatus according to claim 9, characterized in that, The grinding mill is a three-roll grinding mill; The filter is a double-layer filter.

Images