System for producing high-quality anionic surfactant by comprehensively recycling resources

Abstract

The utility model relates to a system for producing a high-quality anionic surfactant by comprehensively recycling resources, which adopts a rotary dehumidifier to efficiently dry process air, ensures that sulfonation reaction is carried out in a stable low-humidity environment, effectively improves the stability of the reaction and the quality of a product, and reduces the production cost. Compared with the prior art, equipment investment and silica gel consumption are reduced, the absorption refrigerator is used for replacing a traditional refrigeration mode, energy consumption of the refrigeration system is reduced, meanwhile, heat released in the cooling process is recycled through the SO3 cooler and used for driving the absorption refrigerator, gradient utilization of energy is achieved, and the energy utilization efficiency of the system is improved. Besides, the system also adopts novel sulfonated dioxane removal equipment, so that by-products such as sulfonated dioxane and the like generated in the sulfonation reaction process can be efficiently removed, and the product quality is further improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to a system for the comprehensive recycling and utilization of resources to produce high-quality anionic surfactants. Background Technology

[0002] Among existing technologies, sulfur trioxide sulfonation is one of the main methods for producing anionic surfactants, and it has been widely used in detergents, textile auxiliaries, emulsifiers, and other fields. Anionic surfactants occupy an important position in the national economy due to their excellent surface activity, emulsifying properties, and detergency.

[0003] Currently, sulfur trioxide sulfonation processes primarily utilize gaseous SO3 as the sulfonating agent, involving multiple steps including an SO3 generation system, a sulfonation system, and a tail gas treatment system. However, existing sulfur trioxide sulfonation production systems generally suffer from low energy efficiency in practical applications. For example, to ensure efficient and stable sulfonation reactions, the air entering the reaction system needs to be dried, typically using methods such as refrigeration dehumidification or chemical adsorption. However, refrigeration dehumidification consumes a lot of energy, and its effectiveness is easily affected by ambient temperature; chemical adsorption suffers from difficulties in adsorbent regeneration and potential secondary pollution problems, making it difficult to meet the stable requirements for low-humidity air. Furthermore, the sulfur trioxide sulfonation reaction itself is a strongly exothermic reaction. To maintain the stability and selectivity of the reaction, the reaction system must be cooled. However, traditional water cooling or air cooling methods have low cooling efficiency, and the heat released during cooling is often directly discharged, resulting in energy waste. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a system for the comprehensive recycling and production of high-quality anionic surfactants through the synergistic optimization of various components, achieving efficient drying and energy recovery.

[0005] To achieve the above objectives, this utility model provides a system for the comprehensive recycling and production of high-quality anionic surfactants, comprising:

[0006] Rotary dehumidifiers are used to dry and dehumidify the process air entering the system;

[0007] The main air blower is used to transport dried process air;

[0008] A sulfur combustion furnace is used to burn sulfur to produce sulfur dioxide gas.

[0009] A conversion tower is used to catalytically oxidize sulfur dioxide gas into sulfur trioxide gas.

[0010] SO3 coolers are used to cool sulfur trioxide gas.

[0011] A sulfonator is used to sulfonate cooled sulfur trioxide with organic raw materials to produce sulfonic acid products.

[0012] A tower-type neutralization reactor is used to receive sulfonic acid products and neutralize them with a neutralizing agent to generate anionic surfactants.

[0013] Dioxane removal equipment is used to remove sulfonated dioxane from the neutralization products;

[0014] Absorption chillers are used to provide a cooling source for rotary dehumidifiers;

[0015] The rotary dehumidifier, main air fan, sulfur combustion furnace, conversion tower, SO3 cooler, sulfonator, tower neutralization reactor, and dioxane removal equipment are sequentially connected through pipelines and valves to form a continuous sulfonation production system. The SO3 cooler is configured to generate steam using the heat released during the cooling process, and its steam outlet is connected to the heat source input end of the absorption chiller through a pipeline. The cold source output end of the absorption chiller is connected to the adsorption zone of the rotary dehumidifier through a pipeline.

[0016] Preferably, the desiccant dehumidifier has a honeycomb structure for its desiccant wheel, and the desiccant material of the desiccant wheel is a molecular sieve or silica gel.

[0017] Preferably, the absorption chiller is a lithium bromide absorption chiller or an ammonia absorption chiller.

[0018] Preferably, the SO3 cooler includes multiple cooling units connected in series, each of which includes an independent cooling medium inlet and a cooling medium outlet.

[0019] Preferably, an SO3 filter is provided at the end of the SO3 cooler to filter impurities in the sulfur trioxide after cooling.

[0020] Preferably, the product outlet of the sulfonator is connected to a primary cyclone separator, and the lower product outlet of the primary cyclone separator is connected to the tower-type neutralization reactor via a sulfonic acid extraction pump; the upper tail gas outlet of the sulfonator is connected to a secondary cyclone separator, and the product outlet of the secondary cyclone separator is connected to the lower product outlet of the primary cyclone separator.

[0021] Preferably, the dioxane removal equipment includes a degassing storage tank, a degassing transfer pump, a degasser, a degassing buffer tank, and a vacuum pump connected in series, and the finished product discharge port of the degasser is connected to the finished product transfer pump.

[0022] Preferably, a surface cooler is provided upstream of the air inlet duct of the adsorption zone of the rotary dehumidifier, and the cold source output end of the absorption chiller is connected to the cooling medium inlet of the surface cooler through a pipe.

[0023] Preferably, the absorption chiller includes a low-temperature water tank, a low-temperature water circulation pump, and an absorption chiller unit connected in sequence. The steam outlet of the SO3 cooler is connected to the heat source input of the absorption chiller unit through a pipe. The cold source output of the absorption chiller unit is connected to the cooling medium inlet of the surface cooler. The cooling medium outlet of the surface cooler is connected to the low-temperature water tank to form a loop.

[0024] This invention presents a system for the comprehensive recycling and production of high-quality anionic surfactants. By employing a rotary dehumidifier to efficiently dry the process air, the system ensures the sulfonation reaction takes place in a stable, low-humidity environment, effectively improving reaction stability and product quality. This reduces equipment investment and the amount of silica gel used. Furthermore, it utilizes an absorption chiller instead of traditional refrigeration methods, lowering the energy consumption of the refrigeration system. Simultaneously, an SO3 cooler recovers the heat released during cooling and uses it to drive the absorption chiller, achieving cascaded energy utilization and improving the system's energy efficiency. In addition, the system employs a novel sulfonated dioxane removal device, which can efficiently remove byproducts such as sulfonated dioxane generated during the sulfonation reaction, further enhancing product quality. Attached Figure Description

[0025] Figure 1 This application provides a system framework for the comprehensive recycling and production of high-quality anionic surfactants. Figure 1 .

[0026] Figure 2 This application provides a system framework for the comprehensive recycling and production of high-quality anionic surfactants. Figure 2 .

[0027] The components include: rotary dehumidifier 10, surface cooler 11, main air fan 20, sulfur combustion furnace 30, conversion tower 40, SO3 cooler 50, SO3 primary cooler 51, SO3 secondary cooler 52, SO3 tertiary cooler 53, SO3 filter 54, sulfonator 60, primary cyclone separator 61, secondary cyclone separator 62, sulfonic acid extraction pump 63, tower neutralization reactor 70, dioxane removal equipment 80, degassing temporary storage tank 81, degassing transfer pump 82, degasser 83, degassing buffer tank 84, vacuum pump 85, finished product transfer pump 86, absorption chiller 90, low temperature water tank 91, low temperature water circulation pump 92, and absorption chiller unit 93. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] The system for producing high-quality anionic surfactants through comprehensive resource recycling described in this embodiment aims to provide a highly efficient, energy-saving, and environmentally friendly sulfonation production system. For example... Figure 1 , Figure 2 As shown, the system mainly includes a rotary dehumidifier 10, a main air fan 20, a sulfur combustion furnace 30, a conversion tower 40, an SO3 cooler 50, a sulfonator 60, a tower-type neutralization reactor 70, a dioxane removal device 80, and an absorption chiller 90.

[0030] Specifically, the rotary dehumidifier 10, main air fan 20, sulfur combustion furnace 30, conversion tower 40, SO3 cooler 50, sulfonator 60, tower neutralization reactor 70, and dioxane removal equipment 80 are sequentially connected through pipelines and valves to form a continuous sulfonation production system, the process flow of which is as follows:

[0031] For example, ambient air first enters the rotary dehumidifier 10, which uses a honeycomb-structured moisture-absorbing rotor. The moisture-absorbing material of the rotor is a molecular sieve or silica gel, which efficiently adsorbs moisture in the air and reduces the humidity of the process air to below the dew point, providing dry reaction gas for the subsequent sulfonation reaction. The dried process air is then transported by pipeline to the main air blower 20, which in turn transports the dried process air to the sulfur combustion furnace 30. Liquid sulfur is burned in the sulfur combustion furnace 30 to produce sulfur dioxide gas. The sulfur dioxide gas then enters the conversion tower 40, which is filled with vanadium catalyst. Under the action of the catalyst, the sulfur dioxide gas is catalytically oxidized into sulfur trioxide gas.

[0032] Subsequently, sulfur trioxide gas enters SO3 cooler 50. In specific implementation, as follows... Figure 1 , Figure 2As shown, the SO3 cooler 50 includes multiple cooling units connected in series, such as a primary SO3 cooler 51, a secondary SO3 cooler 52, and a tertiary SO3 cooler 53. Each cooling unit includes an independent cooling medium inlet and outlet. This multi-stage series cooling unit design decomposes the entire cooling process into multiple temperature zones, allowing each cooling unit to independently adjust the temperature and flow rate of the cooling medium based on its location and the temperature of the sulfur trioxide gas. This achieves stepped cooling, making the temperature difference between each cooling unit more reasonable, improving the overall heat transfer efficiency and cooling effect, and more effectively removing heat from the sulfur trioxide gas, ensuring that the sulfur trioxide gas is fully cooled. In this embodiment, the SO3 cooler 50 is a steam-generating cooler. During the cooling process, the cooling water absorbs the heat of the sulfur trioxide gas to generate low-pressure steam. The generated low-pressure steam is transported through pipelines to the absorption chiller 90 as a heat source. The cooled sulfur trioxide is filtered by the SO3 filter 54 and then undergoes a sulfonation reaction with organic raw materials (such as linear alkylbenzene LAB) in the sulfonator 60 to generate sulfonic acid products. Subsequently, the sulfonic acid products are pumped into the tower neutralization reactor 70 and neutralized with neutralizing agents such as sodium hydroxide solution to generate anionic surfactants. In this embodiment, the tower neutralization reactor 70 is a tower reactor with mechanical stirring added inside the tower to enhance the liquid mixing effect and improve the neutralization reaction efficiency. Finally, the neutralized products enter the dioxane removal equipment 80, where the sulfonated dioxane in the sulfonated products is stripped to obtain the final anionic surfactant product.

[0033] The SO3 cooler 50 is configured to generate steam using the heat released during the cooling process. Its steam outlet is connected to the heat source input of the absorption chiller 90 via a pipe. The cold source output of the absorption chiller 90 is connected to the adsorption zone of the rotary dehumidifier 10 via a pipe, further reducing the air temperature entering the adsorption zone and thus improving the dehumidifier's moisture absorption capacity. In one specific embodiment, the absorption chiller 90 is a lithium bromide absorption chiller or an ammonia absorption chiller.

[0034] In specific implementation, such as Figure 1 , Figure 2As shown, the cold source output of the absorption chiller 90 is connected to the adsorption zone of the rotary dehumidifier 10 via a pipe. A surface cooler 11 is installed upstream of the air inlet pipe of the adsorption zone of the rotary dehumidifier 10. The cold source output of the absorption chiller 90 is connected to the cooling medium inlet of the surface cooler 11 via a pipe to enhance the moisture absorption capacity of the dehumidifier's rotor. In this embodiment, the surface cooler 11 uses a finned heat exchanger, and the cooling medium is low-temperature circulating water, provided by the absorption chiller 90. During operation, the ambient air first undergoes preliminary cooling through the surface cooler 11, reducing the air temperature from 30°C to below 15°C, and some water vapor condenses into liquid water. Subsequently, the pre-cooled air enters the adsorption zone of the rotary dehumidifier 10, where it is further dried by the rotor until the final air humidity meets the process requirements. The cooling medium (low-temperature circulating water) discharged from the surface cooler 11 returns to the absorption chiller 90 for re-cooling, forming a circulation loop.

[0035] In some embodiments, such as Figure 2 As shown, an SO3 filter 54 is installed at the end of the SO3 cooler 50 to filter impurities in the cooled sulfur trioxide. The SO3 filter 54 can effectively remove solid particulate impurities from liquid sulfur trioxide, such as dust, metal corrosion products, and polymer particles, significantly improving the purity of the liquid sulfur trioxide. In another example, to ensure continuous operation of the system, two sets of SO3 filters can be installed in parallel and used alternately, with one set being maintained while the other is in operation.

[0036] In some embodiments, such as Figure 1 , Figure 2 As shown, the product outlet of the sulfonator 60 is connected to a primary cyclone separator 61. The lower product outlet of the primary cyclone separator 61 is connected to the tower-type neutralization reactor 70 via a sulfonic acid extraction pump 62. The upper tail gas outlet of the sulfonator 60 is connected to a secondary cyclone separator 63, and the product outlet of the secondary cyclone separator 63 is connected to the lower product outlet of the primary cyclone separator 61. The tail gas discharged from the sulfonator 60 may contain unreacted sulfur trioxide and organic raw materials. These tail gases are discharged from the upper exhaust port of the sulfonator 60 and enter the secondary cyclone separator 63 for further separation. The liquid phase material captured by the secondary cyclone separator 63 is returned to the inlet of the primary cyclone separator 61 through a pipeline and enters the primary cyclone separator for separation together with the product of the sulfonator. Through two-stage cyclone separation, the products of the sulfonator can be fully separated, ensuring the smooth progress of subsequent processes. Furthermore, by recovering unreacted raw materials, the content of harmful substances in the exhaust gas can be significantly reduced, thus mitigating environmental pollution.

[0037] In some embodiments, such as Figure 1 , Figure 2As shown, the dioxane removal equipment 80 includes a degassing storage tank 81, a degassing transfer pump 82, a degasser 83, a degassing buffer tank 84, and a vacuum pump 85 connected in series. The finished product outlet of the degasser 83 is connected to a finished product transfer pump 86. Specifically, the product after sulfonation reaction first enters the degassing storage tank 81 for preliminary degassing to remove some of the dioxane with low solubility. The product after preliminary degassing is stably fed into the degasser 83 by the degassing transfer pump 82. In this embodiment, the degasser 83 is a packed tower filled with high-efficiency packing to increase the gas-liquid contact area and improve degassing efficiency. The vacuum pump 85 is used to maintain a low-pressure environment in the degasser 83 to promote dioxane vaporization. Finally, the degassed product enters the degassing buffer tank 84 to buffer pressure fluctuations. Finally, the finished product transfer pump 86 transports the sulfonated product after dioxane removal to subsequent processes, such as packaging. At the same time, the removed dioxane gas is condensed and recovered or incinerated to prevent environmental pollution.

[0038] Specifically, the absorption chiller 90 includes a low-temperature water tank 91, a low-temperature water circulation pump 92, and an absorption chiller unit 93 connected in sequence. The steam outlet of the SO3 cooler 50 is connected to the heat source input end of the absorption chiller unit 93 through a pipe. The cold source output end of the absorption chiller unit 93 is connected to the cooling medium inlet of the surface cooler 11. The cooling medium outlet of the surface cooler 11 is connected to the low-temperature water tank 91 to form a loop. In the absorption chiller 90, the cryogenic water tank 91 stores cryogenic circulating water, and the cryogenic water circulation pump 92 drives the cryogenic circulating water to circulate in the system. The absorption chiller unit 93 is the core component of the refrigeration system. The low-pressure steam generated by the SO3 cooler 50 enters the heat source input terminal (e.g., generator) of the absorption chiller unit 93 through a pipeline, providing a driving heat source for the absorption chiller unit 93. The absorption chiller unit 93 delivers the cryogenic refrigerant, i.e., cryogenic water, to the cooling medium inlet of the surface cooler 11, where it absorbs heat from the air, lowering the air temperature. The heated cooling medium is then discharged from the cooling medium outlet of the surface cooler 11 and returned to the cryogenic water tank 91 for reuse. Through this energy cycle loop, energy is utilized in stages, improving the overall energy efficiency of the system.

[0039] The system for producing high-quality anionic surfactants through comprehensive resource recycling provided in this embodiment utilizes a rotary dehumidifier to efficiently dry the process air, ensuring the sulfonation reaction takes place in a stable, low-humidity environment. This effectively improves reaction stability and product quality, reduces equipment investment and silica gel usage, and uses an absorption chiller instead of traditional refrigeration methods, lowering the energy consumption of the refrigeration system. Simultaneously, an SO3 cooler recovers the heat released during cooling and uses it to drive the absorption chiller, achieving cascaded energy utilization and improving the system's energy efficiency. Furthermore, the system employs a novel sulfonated dioxane removal device, which can efficiently remove byproducts such as sulfonated dioxane generated during the sulfonation reaction, thereby further enhancing product quality.

[0040] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A system for producing high-quality anionic surfactants through resource comprehensive recycling, characterized in that, The system comprises: a rotary dehumidifier for drying and dehumidifying process air entering the system; an air main fan for conveying the dried process air; a sulfur furnace for burning sulfur to produce sulfur dioxide gas; a conversion tower for catalytically oxidizing the sulfur dioxide gas into sulfur trioxide gas; an SO3 cooler for cooling the sulfur trioxide gas; a sulfonator for sulfonating the cooled sulfur trioxide with an organic raw material to produce a sulfonic acid product; a tower-type neutralization reactor for receiving the sulfonic acid product and performing a neutralization reaction with a neutralizing agent to produce an anionic surfactant; a dioxane removal device for removing sulfonated dioxane from the neutralized product; an absorption-type refrigeration machine for providing a cold source for the rotary dehumidifier; wherein the rotary dehumidifier, the air main fan, the sulfur furnace, the conversion tower, the SO3 cooler, the sulfonator, the tower-type neutralization reactor, and the dioxane removal device are sequentially connected by pipelines and valves to form a continuous sulfonation production system; the SO3 cooler is configured to generate steam using the heat released during the cooling process, and the steam output port of the SO3 cooler is connected to the heat source input end of the absorption-type refrigeration machine through a pipeline; the cold source output end of the absorption-type refrigeration machine is connected to the adsorption zone of the rotary dehumidifier through a pipeline.

2. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, The moisture-absorbing runner of the rotary dehumidifier is of a honeycomb structure, and the moisture-absorbing material of the moisture-absorbing runner is molecular sieve or silica gel.

3. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, The absorption-type refrigeration machine is a lithium bromide absorption-type refrigeration machine or an ammonia water absorption-type refrigeration machine.

4. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, The SO3 cooler comprises multiple cooling units connected in series, and each cooling unit comprises an independent cooling medium inlet and an independent cooling medium outlet.

5. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, An SO3 filter is arranged at the end of the SO3 cooler to filter impurities in the cooled sulfur trioxide.

6. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, A primary cyclone separator is connected to the product discharge port of the sulfonator, and the lower product discharge port of the primary cyclone separator is connected to the tower-type neutralization reactor through a sulfonic acid extraction pump; a secondary cyclone separator is connected to the upper tail gas discharge port of the sulfonator, and the product discharge port of the secondary cyclone separator is connected to the lower product discharge port of the primary cyclone separator.

7. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, The dioxane removal device comprises, in sequence, a degassing temporary storage tank, a degassing delivery pump, a degassing machine, a degassing buffer tank, and a vacuum pump, and the finished product discharge port of the degassing machine is connected to a finished product delivery pump.

8. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 1, characterized in that, A surface cooler is arranged upstream of the adsorption zone air inlet pipeline of the rotary dehumidifier, and the cold source output end of the absorption-type refrigeration machine is connected to the cooling medium inlet of the surface cooler through a pipeline.

9. The system for producing high-quality anionic surfactants through resource comprehensive recycling according to claim 8, characterized in that, The absorption-type refrigeration machine comprises, in sequence, a low-temperature water tank, a low-temperature water circulating pump, and an absorption-type cold water unit, the steam output port of the SO3 cooler is connected to the heat source input end of the absorption-type cold water unit through a pipeline, the cold source output end of the absorption-type cold water unit is connected to the cooling medium inlet of the surface cooler, and the cooling medium outlet of the surface cooler is connected to the low-temperature water tank to form a loop.

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