Tetrahydrofuran by-product catalytic conversion and resourceful treatment system
By absorbing sulfides with a pre-processor absorbent and raising the temperature with a heater, combined with the precious metal catalyst in the burner and heat recovery through the circulating water pipe, the problem of sulfide poisoning of the catalyst in tetrahydrofuran byproducts is solved, achieving stable combustion and energy recycling, extending catalyst life, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUQIAN YINGKE NEW MATERIALS CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-05-08
AI Technical Summary
The sulfides in tetrahydrofuran byproducts can poison the catalyst during combustion. In existing technologies, water absorption methods affect the combustion treatment effect and efficiency, and the catalyst is easily poisoned, leading to unstable treatment.
The pre-processor is designed to absorb sulfides with an absorbent liquid, and combined with a heater to heat the exhaust gas, ensuring a stable temperature of the exhaust gas entering the burner. It uses a precious metal catalyst for complete combustion and decomposition, and recovers the combustion heat through a circulating water pipe, forming a highly efficient energy cycle system.
It effectively avoids catalyst poisoning, extends catalyst life, ensures the stability and continuity of combustion treatment, improves energy utilization, and reduces enterprise costs.
Smart Images
Figure CN224207734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tetrahydrofuran by-product treatment technology, specifically, to a tetrahydrofuran by-product catalytic conversion and resource utilization system. Background Technology
[0002] Tetrahydrofuran, as a key organic synthesis raw material and high-quality solvent, inevitably generates various byproducts during its production process. These byproducts are complex in composition, and direct emission would cause serious environmental pollution. Currently, existing technologies generally employ incineration to treat these byproducts. However, the high-boiling-point and structurally stable organic compounds present in the byproducts are extremely difficult to completely burn and decompose under normal conditions. Therefore, catalysts are usually needed to accelerate the reaction process and promote the complete combustion of byproducts to mitigate environmental harm.
[0003] The problem is that these byproducts often contain a certain amount of sulfides. During combustion, sulfides react with oxygen to produce sulfur dioxide and other sulfur-containing gases. These sulfur-containing gases are highly chemically reactive and can react with the active sites of the catalyst, causing catalyst poisoning. After catalyst poisoning, its activity and selectivity are significantly reduced.
[0004] To address the sulfide problem, water absorption is a common pretreatment method. However, this method alters the temperature and humidity of the exhaust gas, leading to instability in the subsequent combustion process and affecting treatment effectiveness and efficiency. Utility Model Content
[0005] To address the problems existing in the prior art, this utility model proposes a catalytic conversion and resource utilization system for tetrahydrofuran byproducts.
[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:
[0007] A catalytic conversion and resource utilization system for tetrahydrofuran byproducts includes a pre-processor, a heater, and a burner. The pre-processor has an inlet pipe and an outlet pipe on its left and right side walls, respectively. One end of the outlet pipe is connected to the heater. The pre-processor's inner cavity stores an absorbent liquid. One end of the inlet pipe is bent downwards and extends below the surface of the absorbent liquid. The system also includes a connecting pipe for connecting the heater and the burner.
[0008] Waste gas containing various byproducts generated during the tetrahydrofuran production process is introduced into the pre-processor through an inlet pipe. The inlet pipe is intentionally bent downwards and extends below the surface of the absorbent liquid within the pre-processor's interior. This design ensures sufficient contact between the waste gas and the absorbent liquid, as sulfides are readily soluble in the absorbent liquid. This absorption process significantly reduces the sulfide content in the waste gas. However, the temperature of the treated waste gas decreases due to contact with the absorbent liquid. The treated waste gas is then discharged through an outlet pipe and enters a connected heater.
[0009] The heater heats the exhaust gas to a suitable temperature. This ensures the exhaust gas has a high and stable temperature before entering the burner, creating conditions for stable combustion within the burner. The heated exhaust gas then smoothly enters the burner via a connecting pipe. At this point, the sulfide content in the exhaust gas has been significantly reduced, and the temperature is suitable. Inside the burner, the high-boiling-point, structurally stable organic compounds in the exhaust gas, under the action of a catalyst, can be more fully combusted and decomposed, thereby effectively treating the tetrahydrofuran byproduct.
[0010] The pre-processor utilizes an absorbent liquid to absorb sulfides in the exhaust gas, significantly reducing the sulfide content in the exhaust gas entering the burner. This effectively prevents sulfur-containing gases from chemically reacting with the active sites of the catalyst during combustion, preventing catalyst poisoning and extending catalyst lifespan. In this way, the catalyst can continuously and efficiently assist in the combustion and decomposition of byproducts, ensuring the stability and sustainability of the combustion treatment.
[0011] Preferably, the burner has a partition plate in its inner cavity, which is made of a heat-conducting material. The partition plate divides the inner cavity of the burner into a heat exchange chamber and a combustion chamber arranged above and below, and the connecting pipe is connected to the combustion chamber. It also includes a circulating water pipe and a water pump. A section of the circulating water pipe extends into the heat exchange chamber, and the bottom wall of the extended section is in contact with the upper surface of the partition plate.
[0012] A heat exchange structure consisting of partition plates and circulating water pipes is used to transfer the heat generated by the combustion of exhaust gas in the combustion chamber to the circulating water. This heat can be recovered and used in other production processes, realizing the recycling of energy, improving the energy efficiency of the entire treatment system, and reducing the company's energy consumption and production costs.
[0013] Preferably, the section of the circulating water pipe located in the heat exchange chamber has multiple bends.
[0014] Multiple bends increase the contact area between the circulating water pipes and the baffles, allowing the circulating water to absorb more heat. Simultaneously, the bends lengthen the flow path and time of the circulating water within the heat exchange chamber, further enhancing the heat exchange effect. This enables more efficient recovery and utilization of the heat generated during combustion, improving energy efficiency.
[0015] Preferably, a section of the circulating water pipe extends into the heater to heat the gas entering the heater.
[0016] By introducing the circulating water that absorbs heat in the burner's heat exchange chamber into the heater, the heat energy generated by combustion is reused. Not only does the circulating water recover waste heat from the combustion exhaust gas, but this waste heat is also used to preheat the exhaust gas before it enters the burner, forming a highly efficient energy cycle system. This significantly improves the energy utilization rate of the entire treatment system, reduces dependence on external energy sources, and effectively saves energy costs.
[0017] Preferably, the section of the circulating water pipe extending into the heater has a spiral coil structure.
[0018] The section of the circulating water pipe extending into the heater employs a spiral coil structure, significantly increasing the contact area with the exhaust gas. Compared to a conventional straight pipe structure, the spiral coil allows the circulating water and exhaust gas to exchange heat over a longer path, extending the contact time. This dual effect ensures more complete heat transfer and greatly improves heat exchange efficiency. It also enables more efficient utilization of the waste heat generated from combustion to preheat the exhaust gas.
[0019] Preferably, the outer surface of the circulating water pipe section that does not extend into the heater and burner is covered with an insulation layer.
[0020] The insulation layer reduces heat loss of circulating water during transportation, allowing more heat absorbed from the burner's heat exchange chamber to be effectively transferred to the exhaust gas inside the heater. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the internal structure of the preprocessor, heater, and burner in the embodiment;
[0022] Figure 2 This is a schematic diagram of the circulating water pipe at the bend in the embodiment;
[0023] Figure 3 This is a schematic diagram of the spiral coil structure of the circulating water pipe in the embodiment.
[0024] The names of the parts referred to by the numbers in the attached diagram are as follows:
[0025] 110. Pre-processor; 1101. Inlet pipe; 1102. Outlet pipe; 120. Heater; 130. Burner; 1301. Partition plate; 1302. Heat exchange chamber; 1303. Combustion chamber; 1304. Exhaust outlet; 140. Connecting pipe; 150. Circulating water pipe; 1501. Bend; 1502. Spiral coil structure; 160. Water pump. Detailed Implementation
[0026] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative of this utility model and are not intended to limit it.
[0027] Example
[0028] like Figures 1-3 As shown, the tetrahydrofuran byproduct catalytic conversion and resource utilization system in this embodiment mainly consists of a pre-processor 110, a heater 120, and a burner 130.
[0029] The pre-processor 110 has an air inlet pipe 1101 and an air outlet pipe 1102 respectively on its left and right side walls. One end of the air outlet pipe 1102 is connected to the heater 120. The pre-processor 110 has an absorbent liquid stored inside. One end of the air inlet pipe 1101 is bent downward and extends below the surface of the absorbent liquid.
[0030] The burner 130 has an inner cavity equipped with a partition plate 1301 made of thermally conductive material, which divides the inner cavity of the burner 130 into a heat exchange chamber 1302 and a combustion chamber 1303 arranged vertically. A connecting pipe 140 is used to connect the heater 120 and the combustion chamber 1303. The combustion chamber 1303 is filled with a honeycomb structure of noble metal catalyst such as platinum, palladium or transition metal oxide catalyst. The arrangement of such catalysts is a common supported catalyst arrangement in the prior art. Sufficient contact between the exhaust gas and the catalyst surface is achieved through a fixed bed or honeycomb ceramic support.
[0031] A section of the circulating water pipe 150 extends into the heat exchange chamber 1302, with the bottom wall of this extended section fitting against the upper surface of the partition plate 1301. The section within the heat exchange chamber 1302 has multiple bends 1501. Furthermore, a section of the circulating water pipe 150 extends into the heater 120 in a spiral coil structure 1502. The sections of the circulating water pipe 150 that do not extend into the heater 120 and burner 130 are covered with an insulation layer, which is made of high-temperature resistant rock wool or aluminum silicate fiber felt with a thickness of 20-50 mm, directly wrapping the pipe wall. Specific installation methods can adopt the following common technical solutions. Simultaneously, the system is also equipped with a water pump 160 to drive the circulating water flow within the circulating water pipe 150.
[0032] Its specific operating principle is as follows:
[0033] Waste gas containing various byproducts generated during the tetrahydrofuran production process enters the pre-processor 110 through inlet pipe 1101. Inlet pipe 1101 extends below the surface of the absorbent liquid, ensuring full contact between the waste gas and the absorbent liquid. Sulfides in the waste gas are readily soluble in the absorbent liquid and are largely absorbed, thus reducing the sulfide content in the waste gas. However, the waste gas temperature also decreases accordingly. The low-temperature waste gas, after absorption treatment, is discharged through outlet pipe 1102 and enters heater 120.
[0034] In heater 120, circulating water from the heat exchange chamber 1302 of burner 130 heats the incoming exhaust gas through a section of spiral coil structure 1502. The circulating water absorbs heat in the heat exchange chamber 1302, and the multiple bends 1501 in the tube section increase the contact area and time with the hot air, allowing for more thorough absorption of the heat generated by combustion. Driven by water pump 160, the high-temperature circulating water flows into the spiral coil of heater 120, where it transfers heat to the exhaust gas through the tube wall, raising the exhaust gas temperature to a relatively high and stable temperature suitable for combustion.
[0035] The heated exhaust gas enters the combustion chamber 1303 of the burner 130 through the connecting pipe 140. Inside the combustion chamber 1303, the high-boiling-point, structurally stable organic compounds in the exhaust gas undergo catalytic oxidation under the action of a catalyst, releasing a large amount of heat. After combustion, the gas is discharged from the exhaust outlet 1304. Part of this heat is conducted to the heat exchange chamber 1302 through the partition plate 1301 and absorbed by the circulating water pipe 150, realizing heat recovery and utilization; the other part maintains the high-temperature environment inside the combustion chamber 1303, ensuring continuous and stable catalytic combustion.
[0036] The above setup achieves synergistic efficiency in desulfurization and catalytic combustion. The pre-processor 110 desulfurizes through an absorbent liquid, reducing the poisoning effect of sulfides on the catalyst at the source. The combustion chamber 1303 can adopt a fixed-bed honeycomb catalyst support structure, which is a common industrial catalytic technology. Its high specific surface area enhances the oxidation and decomposition efficiency of organic matter in the exhaust gas. Combined with the low sulfur characteristics after pretreatment, the catalyst life can be extended to 1.5-2 times that of conventional systems.
[0037] In summary, the above are merely preferred embodiments of this embodiment. All equivalent changes and modifications made in accordance with the scope of the patent application of this embodiment shall fall within the scope of the patent of this embodiment.
Claims
1. A catalytic conversion and resource utilization system for tetrahydrofuran byproducts, comprising a pre-processor (110), a heater (120), and a burner (130), characterized in that: The pre-processor (110) has an air inlet pipe (1101) and an air outlet pipe (1102) on its left and right side walls, respectively. One end of the air outlet pipe (1102) is connected to the heater (120). The pre-processor (110) has an absorbent liquid stored in its inner cavity. One end of the air inlet pipe (1101) is bent downwards and extends below the surface of the absorbent liquid. The pre-processor (110) also includes a connecting pipe (140), which is used to connect the heater (120) and the burner (130).
2. The catalytic conversion and resource utilization system for tetrahydrofuran byproducts according to claim 1, characterized in that: The burner (130) has a partition plate (1301) in its inner cavity. The partition plate (1301) is made of heat-conducting material and divides the inner cavity of the burner (130) into a heat exchange chamber (1302) and a combustion chamber (1303) arranged vertically. A connecting pipe (140) is connected to the combustion chamber (1303). The burner also includes a circulating water pipe (150) and a water pump (160). A section of the circulating water pipe (150) extends into the heat exchange chamber (1302), and the bottom wall of the extended section is in contact with the upper end face of the partition plate (1301).
3. The catalytic conversion and resource utilization system for tetrahydrofuran byproducts according to claim 2, characterized in that: The circulating water pipe (150) located in the heat exchange chamber (1302) has multiple bends (1501).
4. The catalytic conversion and resource utilization system for tetrahydrofuran byproducts according to claim 2, characterized in that: A section of the circulating water pipe (150) extends into the heater (120) to heat the gas entering the heater (120).
5. The catalytic conversion and resource utilization system for tetrahydrofuran byproducts according to claim 4, characterized in that: The section of the circulating water pipe (150) that extends into the heater (120) has a spiral coil structure (1502).
6. The catalytic conversion and resource utilization system for tetrahydrofuran byproducts according to claim 4, characterized in that: The outer surface of the circulating water pipe (150) that does not extend into the heater (120) and burner (130) is covered with an insulation layer.