Epoxy resin kettle type debenzene production device
By optimizing the condensation, diversion, and vacuum systems of the batch benzene removal unit, the problem of high-temperature side reactions during the batch benzene removal process was solved, enabling efficient, stable, and environmentally friendly production of epoxy resin.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGFANG FEIYUAN (SHANDONG) ELECTRONIC MATERIALS CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-10
AI Technical Summary
The existing batch-type benzene removal process is prone to side reactions at high temperatures, resulting in substandard product color and lack of automated control, which affects epoxy resin quality and production efficiency.
The benzene removal process is optimized by using components such as parallel condensers, flow guides, vacuum systems, and annular bubble tubes. It achieves efficient and stable separation by condensing based on the azeotropic principle, lowering the boiling point through negative pressure flow and vacuum, and combining steam and nitrogen bubbling.
It improves condensation efficiency, ensures product quality, reduces wastewater and steam consumption, realizes continuous and environmentally friendly production of epoxy resin in batch process, and reduces environmental pollution.
Smart Images
Figure CN224474708U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of chemical production equipment, specifically relating to an epoxy resin autoclave benzene removal production device. Background Technology
[0002] In the industrial production system of epoxy resin, the effective separation of toluene and epoxy resin is a key link in ensuring product quality and production efficiency. Currently, the mainstream separation technologies include three processes: batch-type toluene removal, tower-type toluene removal, and thin-film evaporator toluene removal. Among these, tower-type toluene removal relies on multi-stage distillation columns to achieve continuous separation, making it suitable for large-scale production, but its equipment investment and operating costs are high. Thin-film evaporator toluene removal significantly shortens material residence time by enhancing heat and mass transfer processes, but it has extremely stringent requirements for equipment materials and operating parameters. In contrast, batch-type toluene removal dominates in small and medium-sized epoxy resin production enterprises due to its simple operation process, strong equipment stability, and controllable initial investment costs, and is particularly suitable for multi-variety, small-batch production scenarios.
[0003] To overcome the bottleneck of limited single-batch benzene removal capacity in batches, the industry commonly employs an optimized strategy of multiple toluene-resin solution replenishments. This method effectively improves single-batch benzene removal efficiency without significantly increasing equipment size by intermittently replenishing raw materials. However, this technical route suffers from significant process contradictions: as the benzene removal process continues, the temperature inside the batch gradually rises. When the temperature exceeds 130°C, further replenishment of the toluene-resin solution triggers a series of side reactions. On the one hand, toluene undergoes a condensation reaction with the active groups in the resin under high temperature, generating colored macromolecular compounds; on the other hand, the resin itself undergoes oxidative degradation under high temperature, forming chromophores with conjugated structures. These side reactions cause the color index of the final product to deviate significantly from quality standards, affecting not only the application of epoxy resins in high-end coatings and electronic packaging but also causing chain reactions such as extended production cycles and raw material waste. Furthermore, frequent adjustments to the timing of replenishment and temperature control parameters rely on the operator's experience and judgment, making it difficult to achieve standardized and automated production, thus becoming a technical bottleneck restricting the high-quality development of the epoxy resin industry. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects in the existing technology and provide an epoxy resin autoclave benzene removal production device that ensures stable water return, is safe and environmentally friendly, and produces high-quality products.
[0005] The epoxy resin autoclave benzene removal production device of this utility model includes a benzene removal autoclave, a flow guide, a water separator, and a vacuum system. The top of the benzene removal autoclave is equipped with a No. 1 condenser and a No. 2 condenser. The benzene removal autoclave is connected to the flow guide through a pipeline. The flow guide is connected to the bottom outlet pipe of the water separator. The No. 1 condenser and the No. 2 condenser are connected in parallel. The No. 2 condenser is connected to a buffer tank. The vacuum buffer tank is connected to the vacuum system.
[0006] Preferably, the top of the benzene removal reactor is provided with a toluene resin pipeline.
[0007] Preferably, the top of the water distributor is connected to condenser #1 and condenser #2.
[0008] Preferably, the pipeline connecting the buffer tank and the vacuum system is connected to a branch pipe of the toluene tail gas main pipe.
[0009] Preferably, the vacuum system is connected to a toluene exhaust pipe.
[0010] Preferably, a drainage pump is installed on the outlet pipe of the water distributor.
[0011] Preferably, the vacuum system includes a vacuum pump and a flow meter.
[0012] Preferably, the benzene removal reactor is equipped with an annular bubbling tube inside.
[0013] The benzene removal reactor is equipped with stirring, steam / nitrogen bubbling, and heating functions, and is mainly used for heating toluene resin.
[0014] The aforementioned diverter uses steam to divert water from the distributor back to the benzene removal reactor.
[0015] The water distributor is mainly used to return the water in the water distributor to the benzene removal reactor.
[0016] The No. 1 condenser and No. 2 condenser are used to condense steam in the benzene removal reactor to obtain water and toluene condensate.
[0017] The vacuum system is used for pressure control during the benzene removal process.
[0018] The epoxy resin autoclave benzene removal production device described above operates in the following steps:
[0019] (1) First, 60-70% of the volume of toluene resin is injected into the benzene removal reactor through the toluene resin pipeline. After the injection is completed, the heating is turned on. Under normal pressure, the temperature is raised to 80-100℃, and then the steam is bubbled. Toluene is removed under low temperature conditions using the azeotropic principle. The steam rises to the top of the benzene removal reactor and enters the parallel No. 1 condenser and No. 2 condenser. The No. 1 condenser and No. 2 condenser condense the steam and cool the benzene vapor into liquid. The condensed liquid flows into the water separator.
[0020] (2) After the steam is turned on, the flow guide is turned on. The steam passes through the flow guide and forms a negative pressure, which draws a part of the water in the lower layer of the water separator into the benzene removal kettle, so as to realize the reuse of water, reduce wastewater production and reduce steam consumption.
[0021] (3) When the liquid volume in the benzene removal reactor decreases to 40-50% of the reactor volume, add toluene resin until the liquid volume in the reactor is 60-70% of the reactor volume, turn off the steam bubbling and the siphon, and raise the temperature to 130-140℃.
[0022] (4) Close the system, continue to heat up while turning on the vacuum system, heat up to above 145°C and reduce the pressure in the benzene removal reactor to below 3 kPa.
[0023] (5) Keep the temperature and pressure constant, and turn on the steam bubbling and nitrogen bubbling in sequence to remove the residual toluene and moisture in the system to obtain a low toluene residue epoxy resin product.
[0024] (6) Tail gas treatment: The small amount of toluene tail gas generated during the benzene removal process is collected in the toluene tail gas main pipe branch pipe on the pipeline connecting the buffer tank and the vacuum system, and finally discharged by the vacuum system and subjected to subsequent tail gas treatment to avoid environmental pollution.
[0025] Compared with the prior art, the beneficial effects of this utility model are:
[0026] (1) The epoxy resin debenzene removal production device of this utility model, by setting up No. 1 condenser and No. 2 condenser in parallel, can more fully condense the steam generated in the debenzene removal kettle, improve the condensation efficiency, and thus ensure the separation effect of benzene.
[0027] (2) The epoxy resin autoclave debenzene production device of this utility model adopts a flow guide to provide the power for water return in the water distributor, ensuring a stable water return flow, ensuring smooth liquid flow inside the device, improving the continuity of the production process, reusing the toluene wastewater in the lower layer of the water distributor, reducing steam consumption, reducing toluene wastewater production, and ensuring safety and environmental protection.
[0028] (3) The epoxy resin autoclave benzene removal production device of this utility model has a vacuum system that can create a vacuum environment in the autoclave, reduce the boiling point of benzene, accelerate the removal speed, and improve the removal efficiency. At the same time, the gas flow rate is monitored by a flow meter, which facilitates precise control of the vacuum system and ensures the stability of the device operation.
[0029] (4) The epoxy resin autoclave debenzene production device of this utility model, with the setting of the toluene tail gas main pipe branch pipe and the toluene tail gas discharge pipe, realizes the effective collection and treatment of toluene tail gas, reduces environmental pollution, and meets environmental protection requirements.
[0030] (5) The epoxy resin autoclave debenzene production device of this utility model adopts a ring structure for steam bubbling and nitrogen bubbling, and the cross section adopts a single opening form, which realizes multi-point bubbling effect. At the same time, the single opening form effectively reduces the possibility of blockage, shortens the bubbling time, and improves the debenzene removal efficiency. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the epoxy resin autoclave benzene removal production device of this utility model.
[0032] Figure 2 The images show a cross-sectional view and a top view of the annular bubbling tube.
[0033] In the diagram: 1. Benzene removal reactor; 2. Drainage device; 3. Water distributor; 4. Condenser #1; 5. Condenser #2; 6. Buffer tank; 7. Vacuum system; 8. Toluene resin pipeline; 9. Toluene tail gas main branch pipe; 10. Toluene tail gas discharge pipe; 11. Drain pump; 12. Vacuum pump; 13. Flow meter; 14. Annular bubbling tube. Detailed Implementation
[0034] The present invention will be further described below with reference to specific embodiments.
[0035] like Figure 1 As shown, the epoxy resin batch-type benzene removal production device includes a benzene removal reactor 1, a flow guide 2, a water separator 3, and a vacuum system 7. The top of the benzene removal reactor 1 is equipped with a condenser 4 and a condenser 5. The benzene removal reactor 1 is connected to the flow guide 2 through a pipeline. The flow guide 2 is connected to the bottom outlet pipe of the water separator 3. The condenser 4 and the condenser 5 are connected in parallel. The condenser 5 is connected to a buffer tank 6. The vacuum buffer tank 6 is connected to the vacuum system 7.
[0036] The top of the benzene removal reactor 1 is equipped with a toluene resin pipeline 8.
[0037] The top of the water distributor 3 is connected to condenser 4 (1#) and condenser 5 (2#).
[0038] The buffer tank 6 is connected to the vacuum system 7 via a toluene tail gas main branch pipe 9.
[0039] The vacuum system 7 is connected to a toluene tail gas discharge pipe 10.
[0040] A drain pump 11 is installed on the outlet pipe of the water distributor 3.
[0041] The vacuum system 7 includes a vacuum pump 12 and a flow meter 13.
[0042] The benzene removal reactor 1 is internally equipped with an annular bubbling tube 14. The annular bubbling tube 14 is used for steam bubbling and nitrogen bubbling, and its cross-section adopts a single-opening form to achieve multi-point bubbling, such as... Figure 2 As shown.
[0043] The epoxy resin autoclave benzene removal production device described above operates in the following steps:
[0044] (1) First, 60-70% of the volume of toluene resin is pumped into the benzene removal reactor 1 from the toluene resin pipeline 8. After the pumping is completed, the heating is turned on and the temperature is raised to 80-100℃ under normal pressure. Then, the steam is bubbled and the toluene is removed under low temperature conditions using the azeotropic principle. The steam rises to the top of the benzene removal reactor and enters the parallel condenser 4 and condenser 5. The condenser 4 and condenser 5 condense the steam and cool the benzene vapor into liquid. The condensed liquid flows into the water separator 3. This reduces the color increase of the finished resin caused by the feeding. The color of the product can be reduced by 2-3 color levels compared with the previous version.
[0045] (2) After the steam is turned on, the inlet valve 2 is turned on. The steam passes through the inlet valve 2 and forms a negative pressure, which draws a portion of the water in the lower layer of the water separator 3 into the benzene removal kettle 1, thereby realizing the reuse of water, reducing wastewater production and reducing steam consumption.
[0046] (3) When the liquid volume in the benzene removal reactor 1 decreases to 40-50% of the volume of the benzene removal reactor 1, add toluene resin until the liquid in the reactor accounts for 60-70% of the volume of the benzene removal reactor, turn off the steam bubbler and the vent, and raise the temperature to 130-140℃.
[0047] (4) Close the system, continue to heat up while opening the vacuum system 7, heat up to above 145°C and reduce the pressure in the benzene removal reactor to below 3 kPa.
[0048] (5) Keep the temperature and pressure constant, and turn on the steam bubbling and nitrogen bubbling in sequence to remove the residual toluene and moisture in the system to obtain a low toluene residue epoxy resin product.
[0049] (6) Tail gas treatment: The small amount of toluene tail gas generated during the benzene removal process is collected in the toluene tail gas main pipe branch pipe 9 on the pipeline connecting the buffer tank 6 and the vacuum system 7, and finally discharged by the vacuum system and subjected to subsequent tail gas treatment to avoid environmental pollution.
[0050] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.
Claims
1. A batch-type benzene removal production device for epoxy resin, characterized in that: The system includes a benzene removal reactor (1), a flow guide (2), a water separator (3), and a vacuum system (7). The top of the benzene removal reactor (1) is equipped with a condenser (4) and a condenser (5). The benzene removal reactor (1) is connected to the flow guide (2) through a pipeline. The flow guide (2) is connected to the bottom outlet pipe of the water separator (3). The condenser (4) and the condenser (5) are connected in parallel. The condenser (5) is connected to the buffer tank (6). The vacuum buffer tank (6) is connected to the vacuum system (7).
2. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: The top of the benzene removal reactor (1) is equipped with a toluene resin pipeline (8).
3. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: The top of the water distributor (3) is connected to condenser #1 (4) and condenser #2 (5).
4. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: The buffer tank (6) is connected to the vacuum system (7) via a toluene tail gas main branch pipe (9).
5. The epoxy resin batch-type benzene removal production apparatus according to claim 4, characterized in that: The vacuum system (7) is connected to a toluene tail gas discharge pipe (10).
6. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: A drain pump (11) is installed on the outlet pipe of the water distributor (3).
7. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: The vacuum system (7) includes a vacuum pump (12) and a flow meter (13).
8. The epoxy resin batch-type benzene removal production apparatus according to claim 1, characterized in that: The benzene removal reactor (1) is equipped with an annular bubbling tube (14).