System and method for preparing sodium ethyl xanthate based on microchannel technology

Abstract

The invention provides a system and a method for preparing sodium ethyl xanthate based on a microchannel technology, and belongs to the technical field of chemical synthesis. The system comprises a storage tank, a metering pump, a mixing pump, a micro-channel reactor, a concentration kettle, a condenser, a centrifugal machine and a drying machine. The method comprises the following steps: mixing carbon disulfide, ethanol and caustic soda liquid according to a predetermined ratio by a mixing pump, feeding the mixture into a microchannel reactor, reacting under the conditions of controllable temperature and retention time to generate a sodium ethyl xanthate solution, carrying out reduced pressure distillation concentration by a concentration kettle, carrying out centrifugal separation to obtain a solid product, and drying to obtain a final product. The method provided by the invention improves the reaction efficiency and the product purity, reduces side reactions and generation of by-products, reduces the danger and environmental pollution in the production process by accurately controlling reaction conditions and equipment cooperation, has the advantages of high efficiency, safety and environmental protection, provides an efficient solution for industrial continuous production of sodium ethyl xanthate, and has a wide application prospect in industrial production of sodium ethyl xanthate. The method is suitable for wide application in the fields of beneficiation reagents and the like.

Description

Technical Field

[0001] The invention relates to the technical field of chemical synthesis, and in particular to a system and method for preparing sodium ethyl xanthate based on microchannel technology. Background Art

[0002] Xanthate, also known as xanthate, is an important chemical substance first synthesized by Keller in 1815. It is widely used in many fields, especially in the ore flotation industry, where its role is irreplaceable. Since xanthate was first used in the flotation of non-ferrous metal ores in 1926, this technological breakthrough has greatly promoted the development of the flotation industry. As a key collector in the flotation process, xanthate can effectively adsorb on the surface of metal sulfide ores to form stable bubble-mineral particle aggregates, thereby achieving efficient separation of sulfide ores and impurity minerals. Ethyl xanthate has always been one of the core varieties in the field of mineral processing reagents due to its low cost and excellent flotation performance. It plays an important role in the flotation of polymetallic sulfide ores such as copper, lead and zinc.

[0003] With the rapid development of the non-ferrous metal industry, the demand for ethyl xanthate continues to grow. However, the existing methods for preparing ethyl xanthate still face many problems, which restrict its large-scale industrial production and promotion and application. The traditional methods for preparing ethyl xanthate usually use ethanol, sodium hydroxide and carbon disulfide as raw materials and react in a kneader or kettle reactor. However, these traditional methods have the following major defects:

[0004] Serious environmental pollution: In traditional processes, the reaction process easily produces a large amount of waste liquid and volatile harmful gases, such as carbon disulfide and other sulfur-containing compounds, which are difficult to handle and are extremely harmful to the environment. In addition, production under closed conditions has not completely prevented the escape of harmful substances, posing a threat to the safety of operators.

[0005] Many side reactions and by-products: The reaction efficiency in traditional processes is low, and side reactions often occur in the reaction system, resulting in a high proportion of by-products. This not only reduces the purity of the target product sodium ethyl xanthate, but also increases the difficulty of separation and purification, and increases production costs; Unstable product quality: Due to the poor controllability of the reaction process and limited mass transfer and heat transfer effects, traditional methods are difficult to ensure the stability of product quality, resulting in large fluctuations in the purity and content of different batches of products, and cannot meet the demand for high-purity xanthate in modern flotation processes; Low production efficiency: Due to the inefficient mass transfer and heat transfer performance of kneading machines or kettle reactors, the reaction rate is slow, the reaction time is long, and the overall production efficiency is low. This not only increases energy consumption, but also limits the expansion of production scale; Poor safety: The preparation of ethyl xanthate involves volatile and highly toxic raw materials such as carbon disulfide. In traditional processes, due to the limitations of equipment and the lag in process control, it is very easy to cause safety accidents such as fire and explosion, and the process risk is high.

[0006] In order to overcome the above problems, some studies have proposed new processes such as solvent method and aqueous solution method in recent years. These new methods attempt to reduce pollutant emissions and improve product purity by improving reaction conditions and optimizing process flow. However, these methods have not fundamentally solved the existing problems, specifically manifested as follows: the by-product problem is still prominent: although the solvent method and aqueous solution method have reduced environmental pollution to a certain extent, there are still many side reactions in the reaction process, especially the by-product of carbon disulfide is difficult to control, which makes it difficult to further improve the purity of the product; the process complexity increases: some improved methods introduce multi-step reaction processes and complex separation and purification steps, which not only increases the complexity of equipment and operation, but also further increases production costs; continuous and large-scale production capacity is insufficient: traditional processes and some improved processes rely on intermittent reactors, and the degree of continuity and automation of the reaction process is low, which is difficult to meet the needs of large-scale industrial production.

[0007] In summary, the existing preparation methods of ethyl xanthate have significant deficiencies in terms of environmental protection, product quality stability, reaction efficiency and safety, and cannot meet the needs of modern production for efficient, environmentally friendly and safe processes. Therefore, a new technical solution is urgently needed to optimize the reactor design and process flow, while improving product quality and purity, reducing environmental pollution and process risks, and ultimately achieving efficient, green and continuous production of sodium ethyl xanthate. Summary of the invention

[0008] One of the technical problems to be solved by the present invention is to provide a system for preparing sodium ethyl xanthate based on microchannel technology, so as to solve the problems of large reaction environmental pollution, low reaction efficiency, large number of reaction by-products and insufficient operation safety existing in the prior art.

[0009] In order to overcome the above defects of the prior art, the present invention provides a system for preparing sodium ethyl xanthate based on microchannel technology, which comprises the following parts:

[0010] The first storage tank, the second storage tank and the third storage tank are used to store the reaction raw materials carbon disulfide, ethanol and liquid alkali respectively;

[0011] Mixing pump: the input end of the mixing pump is connected to the output ends of the first storage tank, the second storage tank and the third storage tank, and is used to mix carbon disulfide, ethanol and liquid alkali;

[0012] Microchannel reactor: the input end of the microchannel reactor is connected to the output end of the mixing pump, and is used to receive the mixed reaction raw materials, and react at a set temperature and residence time to generate a sodium ethyl xanthate solution;

[0013] Concentration kettle: the input end of the concentration kettle is connected to the output end of the microchannel reactor, and is used for performing reduced pressure distillation and concentration on the sodium ethyl xanthate solution generated by the reaction of the microchannel reactor. The concentration kettle is provided with a recovery output end and a product output end;

[0014] Condenser: The input end of the condenser is connected to the recovery output end of the concentration kettle, and is used to recover unreacted raw materials and by-products;

[0015] Centrifuge: The input end of the centrifuge is connected to the product output end of the concentration kettle, and is used to separate the concentrated sodium ethyl xanthate;

[0016] Dryer: The input end of the dryer is connected to the output end of the centrifuge and is used to dry the separated sodium ethyl xanthate to obtain the final product.

[0017] The system for preparing sodium ethyl xanthate based on microchannel technology of the present invention utilizes the efficient mass transfer and heat transfer characteristics of the microchannel reactor, so that the reaction raw materials can quickly and evenly complete the chemical reaction at a microscale, and the occurrence of side reactions is minimized. Through the continuous design of the whole system, the whole preparation process is smooth and stable, and the reaction rate is improved. The purity and yield of sodium ethyl xanthate are significantly better than those of traditional technologies, the quality of the prepared product is more stable, the system safety is higher, and the impact on the environment is reduced. Compared with the prior art, the system has the following advantages:

[0018] Efficient reaction mass transfer and heat transfer: The system of the present invention adopts a microchannel reactor, whose microscale structure significantly improves the mass transfer and heat transfer efficiency during the reaction process, thereby greatly shortening the reaction time and increasing the reaction rate; at the same time, the precise control capability of the microchannel can avoid local overheating and side reactions, thereby reducing the generation of by-products and improving product purity; Continuous production and stability: The system of the present invention adopts a modular system design, which can realize continuous operation of reaction, concentration, separation and drying, avoiding the instability caused by frequent switching in traditional intermittent processes. In addition, the synergistic effect of each unit equipment ensures the efficiency and stability of the overall operation of the system, which is particularly suitable for industrial production; Environmental friendliness and high resource utilization: The system of the present invention recovers unreacted raw materials and by-products through a condenser, which can realize the recycling of resources and reduce resource waste and environmental pollution; The vacuum distillation process can effectively remove the moisture and unreacted raw materials generated by the reaction, further improving the product yield; High operational safety: The microchannel reactor used in the system. Its internal reaction space is small, and its unique structural design reduces the accumulation of reactants, fundamentally reducing the risk of the reaction; at the same time, the entire system operates under closed conditions, reducing the harm of volatile and toxic raw materials to operators and the environment, greatly improving operational safety.

[0019] In a possible implementation, the output ends of the first storage tank, the second storage tank, and the third storage tank are respectively connected to the first metering pump, the second metering pump, and the third metering pump in a one-to-one correspondence, the output ends of the first metering pump, the second metering pump, and the third metering pump are connected to the input end of the mixing pump, and the output end of the condenser is connected to a receiving tank.

[0020] Compared with the existing technology, the above technical solution is adopted, by introducing an independent metering pump between the storage tank and the mixing pump and realizing a one-to-one connection, so as to accurately control the dosage of each raw material, and at the same time avoid cross contamination and flow instability during the raw material transportation process. The application of the metering pump optimizes the supply method of the reaction raw materials, and improves the uniformity and rate of the reaction through stable and accurate raw material ratio and continuous feeding, ensuring that the subsequent reaction stage can be completed under the best conditions. The material condensed by the condenser is temporarily stored in the receiving tank.

[0021] Another technical problem to be solved by the present invention is to provide a method for preparing sodium ethyl xanthate based on microchannel technology to solve the problems of low reaction efficiency, low product purity, large number of by-products and serious waste of raw materials in the prior art.

[0022] In order to overcome the above defects of the prior art, the present invention provides a method for preparing sodium ethyl xanthate based on microchannel technology, and the method is implemented by the system and comprises the following steps:

[0023] S1: Raw material preparation and transportation: Carbon disulfide, ethanol and liquid alkali are stored in the first storage tank, the second storage tank and the third storage tank respectively, and are transported to the mixing pump according to the preset molar equivalent ratio, and are preliminarily mixed in the mixing pump;

[0024] S2: microchannel reaction: feeding the mixed raw materials in step S1 into a microchannel reactor, controlling the reaction temperature and reaction residence time in the microchannel reactor, so that carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution;

[0025] S3: Concentration treatment: the sodium ethyl xanthate solution generated in step S2 is output from the microchannel reactor to a concentration kettle, and distilled and concentrated under reduced pressure conditions, unreacted raw materials and by-products are discharged from the recovery output end of the concentration kettle, and recovered through a condenser, and the concentrated sodium ethyl xanthate solution is discharged from the product output end of the concentration kettle;

[0026] S4: centrifugal separation: sending the concentrated sodium ethyl xanthate solution in step S3 into a centrifuge to separate the sodium ethyl xanthate solid and the byproduct liquid by the centrifuge;

[0027] S5: Drying treatment: The sodium ethyl xanthate solid separated by the centrifuge in step S4 is sent to a dryer and dried under controlled drying conditions to obtain the final sodium ethyl xanthate product.

[0028] The present invention discloses a method for preparing sodium ethyl xanthate based on microchannel technology, which overcomes the shortcomings of low reaction efficiency, low product purity, many by-products and serious waste of raw materials in traditional processes by adopting microchannel reactor technology, and realizes efficient, safe and continuous preparation of sodium ethyl xanthate, providing a low-cost, high-efficiency and green production process for related industries. Compared with the prior art, it has the following advantages:

[0029] Reaction efficiency is significantly improved: This method uses a microchannel reactor instead of a traditional reactor, so that the mixed reaction of carbon disulfide, ethanol and liquid alkali is carried out in a microscale environment of a microchannel. The microchannel has an extremely high surface area to volume ratio, which significantly improves the mass transfer and heat transfer efficiency of the reaction, ensuring that the reaction can be fully completed in a shorter time, greatly shortening the reaction time;

[0030] Higher product purity: Thanks to the precisely controlled raw material ratio and high uniformity of the microchannel reaction, the occurrence of side reactions is effectively suppressed and the amount of by-products is significantly reduced, making the purity of the final sodium ethyl xanthate product significantly higher than that of the traditional process;

[0031] Continuous production to achieve stable process: Traditional methods are mostly intermittent operations, while this method achieves continuous reaction through microchannel technology, greatly improving the stability and consistency of the production process. Through continuous delivery of raw materials, continuous reaction and downstream processing, industrial large-scale continuous production can be achieved, while avoiding the process fluctuation problem in intermittent operation;

[0032] Green and environmentally friendly, high resource utilization rate: In the concentration process, this method recovers the unreacted raw materials and by-products discharged from the output end, which can be reused after being recovered through the condenser, greatly improving the utilization rate of raw materials, reducing raw material waste, and reducing waste emissions, which is more environmentally friendly;

[0033] High operational safety: The reaction volume in the microchannel reactor is small, which reduces the potential safety risks when reacting highly dangerous raw materials (such as carbon disulfide). Even under abnormal circumstances, the amount of dangerous substances is limited to an extremely low range, which essentially improves the safety of the reaction;

[0034] Strong controllability: Through precise control of the temperature, residence time and liquid flow rate of the microchannel reactor, the reaction conditions can be precisely adjusted, making the production process more controllable, thereby further improving the stability of product quality;

[0035] Strong adaptability and suitable for production of different scales: This method is not only suitable for research in the laboratory pilot stage, but can also achieve industrial expansion production through modular design, thus meeting the needs of production of different scales.

[0036] In a possible implementation, in step S1, the liquid alkali is sodium hydroxide, and the concentration of the sodium hydroxide is 30-50%.

[0037] Compared with the prior art, the above technical solution optimizes the concentration range of liquid alkali (30-50%), and on the basis of ensuring the activity and sufficiency of sodium hydroxide in the reaction, avoids the surge of side reactions caused by too high concentration or incomplete reaction caused by too low concentration during the reaction, directly improving the generation efficiency and purity of the target product. At the same time, the above concentration range ensures the long-term operation of the microchannel equipment and reduces the risk of alkaline corrosiveness and heat accumulation.

[0038] In a possible implementation, in step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid alkali is 1:(1-1.1):(1-1.1).

[0039] Compared with the prior art, the above technical solution can ensure full utilization of carbon disulfide in the reaction by slightly adjusting the molar equivalent ratio of ethanol and liquid caustic soda to 1-1.1 times of carbon disulfide, thereby avoiding incomplete reaction due to insufficient carbon disulfide. At the same time, excess ethanol and liquid caustic soda can quickly capture the side reaction intermediates that may be formed in the reaction, such as disulfide or unreacted carbon sulfide, thereby reducing the generation of by-products; in addition, the precise ratio setting can also be further optimized through the flow rate and residence time of the microchannel reactor, and ultimately the purity and yield of the target product are ensured while achieving efficient conversion. In this way, not only the waste of raw materials and the environmental burden are reduced, but also the economy and environmental protection of the overall process are significantly improved. .

[0040] In a possible implementation, in step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid caustic soda is 1:1.05:1.05.

[0041] Compared with the prior art, the above technical scheme is adopted to optimize the molar equivalent ratio of carbon disulfide, ethanol and liquid alkali to 1:1.05:1.05, thereby further improving the yield and purity of sodium ethyl xanthate, making the performance of the final product more stable and the quality consistent. In addition, by optimizing the molar equivalent ratio of the raw materials and slightly increasing the ratio of ethanol and liquid alkali, it is possible to effectively reduce the generation of reaction intermediates and by-products while ensuring the complete reaction of carbon disulfide, thereby avoiding the difficulty of separation and purification caused by excessive by-products in subsequent operations.

[0042] In a possible implementation, in step S2, the reaction temperature is 0-45° C., and the reaction residence time is 1-240 min.

[0043] Compared with the prior art, the above technical scheme is adopted, by setting the reaction temperature to a wide range of 0-45°C and the residence time to 1-240 minutes, the reaction process can be optimized for different process conditions and raw material states, the applicability and efficiency of the system are ensured, and the process requirements under different reaction conditions are adapted to the maximum extent; at lower temperatures and shorter times, the occurrence of heat-sensitive side reactions can be effectively suppressed; and at higher temperatures and longer times, the reaction rate can be accelerated and the complete conversion of carbon disulfide, ethanol and liquid alkali can be promoted. The precise temperature control capability and adjustable residence time of the microchannel reactor in the technical scheme further enhance the above effects, thereby realizing an efficient and stable synthesis process of sodium ethyl xanthate, solving the problems of low yield and high energy consumption caused by inflexible reaction conditions or high limitations in the prior art.

[0044] In a possible implementation manner, in the step S2, the reaction temperature is 25-30°C, and the reaction residence time is 220 min.

[0045] Compared with the prior art, the above technical scheme provides sufficient activation energy for the reaction of carbon disulfide, ethanol and liquid alkali by selecting the optimal temperature range of 25-30°C for reaction activation, and avoids the generation of impurities caused by side reactions in traditional high-temperature reactions; and the reaction time of 220 minutes ensures that the raw materials fully stay in the microchannel, so that the contact efficiency and mass transfer effect between the reactants are optimized. The efficient mass transfer and temperature control capabilities of the microchannel reactor in the present invention further enhance this effect, which can not only complete the reaction at a lower temperature, but also ensure the high purity and high yield of the product.

[0046] In a possible implementation, in step S2, the hydraulic diameter in the microchannel reactor is 100-6000 microns.

[0047] Compared with the prior art, the above-mentioned technical scheme allows the microchannel reactor to fully demonstrate the efficient mass transfer and controllability of the microscale reactor through the hydraulic diameter range of 100-6000 microns. The smaller hydraulic diameter enables the reactants to form high turbulence and short mixing time in the channel, thereby improving the mass transfer efficiency and reaction rate; while the larger hydraulic diameter provides convenience for the industrial processing of high-flow materials and avoids the blockage problem caused by the narrow channel. Compared with the traditional reactor, the above-mentioned technical scheme of the present invention ensures the flexible switching between small-batch precision production and large-scale industrial application by reasonably designing the range of hydraulic diameter, which not only improves the completeness of the reaction, but also reduces the risk in the process operation.

[0048] In a possible implementation, in step S2, the reaction formula of the microchannel reaction is: C2H5OH+NaOH+CS2→C2H5OCS Na+H2O.

[0049] Compared with the prior art, the above technical solution adopts a clear chemical reaction formula design (C2H5OH+NaOH+CS2→C2H5OCSNa+H2O), combined with the efficient mass transfer and heat transfer performance of the microchannel technology in the present invention, to ensure that the reactants complete the generation of the target product in the shortest time and the best ratio, while avoiding the problems of multi-step reactions and side reactions in traditional processes. The advantages of the microchannel reactor in temperature and time control further ensure the controllability and selectivity of the reaction, so that sodium ethyl xanthate can be produced efficiently and continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of a system for preparing sodium ethyl xanthate based on microchannel technology in the present invention; Figure 1In: 1. first storage tank, 2. second storage tank, 3. third storage tank, 4. first metering pump, 5. second metering pump, 6. third metering pump, 7. mixing pump, 8. microchannel reactor, 9. concentration kettle, 10. condenser, 11. centrifuge, 12. dryer, 13. receiving tank; 14. recovery output end; 15. product output end.

[0051] Figure 2 The infrared spectra (FT-IR) of the sodium ethyl xanthate prepared by the present invention and the industrial grade purified sodium ethyl xanthate are shown. DETAILED DESCRIPTION

[0052] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0053] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0054] like Figure 1 As shown, the present invention provides a system for preparing sodium ethyl xanthate based on microchannel technology, and the system comprises the following parts:

[0055] The first storage tank 1, the second storage tank 2, and the third storage tank 3 are used to store the reaction raw materials carbon disulfide, ethanol, and liquid alkali respectively;

[0056] Mixing pump 7: the input end of the mixing pump 7 is connected to the output ends of the first storage tank 1, the second storage tank 2 and the third storage tank 3, and is used to mix carbon disulfide, ethanol and liquid alkali;

[0057] Microchannel reactor 8: The input end of the microchannel reactor 8 is connected to the output end of the mixing pump 7, and is used to receive the mixed reaction raw materials, and react at a set temperature and residence time to generate a sodium ethyl xanthate solution;

[0058] Concentration kettle 9: the input end of the concentration kettle 9 is connected to the output end of the microchannel reactor 8, and is used for performing reduced pressure distillation and concentration on the sodium ethyl xanthate solution generated by the reaction of the microchannel reactor 8. The concentration kettle 9 is provided with a recovery output end 14 and a product output end 15;

[0059] Condenser 10: The input end of the condenser 10 is connected to the recovery output end 14 of the concentration tank 9, and is used to recover unreacted raw materials and by-products;

[0060] Centrifuge 11: The input end of the centrifuge 11 is connected to the product output end 15 of the concentration kettle 9, and is used to separate the concentrated sodium ethyl xanthate;

[0061] Dryer 12: The input end of the dryer 12 is connected to the output end of the centrifuge 11, and is used to dry the separated sodium ethyl xanthate to obtain the final product.

[0062] As a preferred solution, the output ends of the first storage tank 1, the second storage tank 2, and the third storage tank 3 are respectively connected to the first metering pump 4, the second metering pump 5, and the third metering pump 6 in a one-to-one correspondence, the output ends of the first metering pump 4, the second metering pump 5, and the third metering pump 6 are connected to the input end of the mixing pump 7, and the output end of the condenser 10 is connected to a receiving tank 13.

[0063] The present invention also provides a method for preparing sodium ethyl xanthate based on microchannel technology, which is realized by the above system, and its flow direction is as follows: Figure 1 As shown, the following steps are included:

[0064] S1: Raw material preparation and transportation: Carbon disulfide, ethanol and liquid alkali are stored in the first storage tank 1, the second storage tank 2 and the third storage tank 3 respectively, and are transported to the mixing pump 7 according to a preset molar equivalent ratio, and are preliminarily mixed in the mixing pump 7;

[0065] S2: microchannel reaction: the raw materials mixed in step S1 are fed into the microchannel reactor 8, and the reaction temperature and reaction residence time in the microchannel reactor 8 are controlled to make carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution;

[0066] S3: Concentration treatment: The sodium ethyl xanthate solution generated in step S2 is output from the microchannel reactor 8 to the concentration kettle 9, and is distilled and concentrated under reduced pressure conditions, and unreacted raw materials and by-products are discharged from the recovery output end 14 of the concentration kettle 9, and are recovered through the condenser 10, and the concentrated sodium ethyl xanthate solution is discharged from the product output end 15 of the concentration kettle 9;

[0067] S4: centrifugal separation: the concentrated sodium ethyl xanthate solution in step S3 is sent to a centrifuge 11, and the sodium ethyl xanthate solid and the by-product liquid are separated by the centrifuge 11;

[0068] S5: Drying treatment: The sodium ethyl xanthate solid separated by the centrifuge 11 in step S4 is sent to the dryer 12, and the drying conditions are controlled to perform drying treatment to obtain the final sodium ethyl xanthate product.

[0069] As a preferred solution, in step S1, the liquid alkali is sodium hydroxide, and the concentration of the sodium hydroxide is 30-50%.

[0070] As a preferred solution, in step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid alkali is 1:(1-1.1):(1-1.1).

[0071] As a preferred solution, in step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid alkali is 1:1.05:1.05.

[0072] As a preferred solution, in step S2, the reaction temperature is 25-30°C, and the reaction residence time is 220 min.

[0073] As a preferred solution, in step S2, the reaction temperature is 0-45°C, and the reaction residence time is 1-240 min.

[0074] As a preferred solution, in step S2, the hydraulic diameter in the microchannel reactor is 100-6000 microns.

[0075] As a preferred solution, in step S2, the reaction formula of the microchannel reaction is:

[0076] C2H5OH+NaOH+CS2→C2H5OCSSNa+H2O.

[0077] The system and method of the present invention, through close cooperation, embody a high degree of synergy, thereby achieving the goal of preparing high-yield, high-purity sodium ethyl xanthate. Specifically, the system and method of the present invention form a unique synergy in the following aspects:

[0078] 1. Synergy of efficient mass transfer and reaction control

[0079] The microchannel reactor of the present invention forms a close cooperation with the mixing pump system and the metering pump system through its unique microscale structure and high mass and heat transfer efficiency. The metering pump system ensures that carbon disulfide, ethanol and liquid alkali are evenly delivered to the mixing pump at an accurate molar equivalent ratio, while the mixing pump completes the initial efficient mixing operation, laying the foundation for the uniform distribution of the reactants entering the microchannel reactor; and the efficient reaction conditions of the microchannel reactor (controllable temperature, residence time and reaction channel design) ensure sufficient contact and selective reaction between the reactants, thereby avoiding local overheating and the occurrence of side reactions. This system collaboration greatly improves the conversion rate of carbon disulfide, ethanol and liquid alkali, while ensuring that the generated sodium ethyl xanthate has a high purity;

[0080] 2. Synergy of precise control and efficient separation

[0081] In the process of preparing high-purity sodium ethyl xanthate, an efficient collaborative working relationship is formed between the concentrator, condenser and centrifuge in the system. The concentrator separates the unreacted raw materials and by-products from the reaction solution under reduced pressure distillation conditions and discharges them to the condenser for recycling, while the concentrated sodium ethyl xanthate solution is discharged from the product output end; the above-mentioned precise separation not only effectively retains the high purity of the target product, but also reduces the interference of unreacted raw materials and by-products on subsequent processes, while achieving efficient utilization of resources and recycling of by-products, thereby reducing the energy consumption and waste treatment costs of the entire process;

[0082] 3. Synergistic effect of continuous reaction and efficient drying

[0083] Through the combined action of the centrifuge and the dryer, the present invention realizes the efficient conversion of the target product sodium ethyl xanthate from a solution state to a solid state. The centrifuge separates the target product from the byproduct liquid in the concentrate, and the dryer further dries the sodium ethyl xanthate solid obtained by centrifugal separation; this system coordination effectively avoids the quality loss caused by insufficient or excessive drying of the product in the traditional process, and at the same time ensures the purity and yield of the product by optimizing the drying conditions.

[0084] 4. Dynamic matching and optimization between systems and methods

[0085] The system and method of the present invention are designed to complement each other. Through the dynamic matching of system hardware (including the precise design of microchannel reactors) and process methods (including optimized molar equivalent ratios, reaction temperatures, and residence times), significant synergistic effects are achieved, including:

[0086] System optimization and coordination method: The coordination of the microchannel reactor and the concentration kettle in the system enables the by-products produced by the reaction to be efficiently distilled and discharged, thus avoiding the influence of the accumulation of by-products on the purity of the target product;

[0087] The method acts inversely on the system: the optimized reaction conditions (such as a temperature of 25-30°C and a raw material molar equivalent ratio of 1:1.05:1.05) improve the operating efficiency of the equipment (microchannel reactor) in the system, so that the yield and purity of the final product are both optimized;

[0088] Through the synergistic effect of the above-mentioned system and method, the present invention achieves the following technical advantages: high yield and high purity: the yield of the product sodium ethyl xanthate reaches more than 90%, and the purity can reach more than 95%, which is much higher than the traditional process; efficient, environmentally friendly, and continuous production: the design of the system and method reduces energy consumption and raw material waste, and realizes continuous and automated production from raw material feeding to final product output, which significantly improves production efficiency and reduces the emission of by-products, meeting the high requirements of modern industry for environmental protection; safety and stability: the efficient mass transfer and heat transfer performance of the microchannel reactor avoids the instability of reaction conditions and local overheating, and greatly improves the safety of the process.

[0089] In summary, the system and method of the present invention cooperate with each other, and through the synergistic effects in the reaction control, separation and purification, and drying treatment, an efficient and highly selective process chain is formed from the whole process from raw materials to products. This synergistic mechanism not only achieves a high yield and high purity of sodium ethyl xanthate, but also reduces production costs, improves the safety and environmental protection performance of the process, and provides a new solution for industrial production.

[0090] The following provides a specific embodiment combined with data in combination with the above-mentioned technical solution to further expand the technical solution of the present invention:

[0091] Embodiment 1:

[0092] This embodiment provides a system and method for preparing sodium ethyl xanthate based on microchannel technology. The system includes: a storage tank system, a metering pump system, a mixing pump 7, a microchannel reactor 8, a concentration kettle 9, a condenser 10, a centrifuge 11 and a dryer 12, and their corresponding positions and functions are as follows:

[0093] Storage tank system: The system includes three independent storage tanks, namely the first storage tank 1, the second storage tank 2 and the third storage tank 3, which are used to store carbon disulfide, ethanol and liquid alkali respectively. The outlet of each storage tank is connected to the corresponding metering pump through a pipeline for conveying raw materials;

[0094] Metering pump system: Each of the above storage tanks corresponds to a metering pump, which includes a first metering pump 4, a second metering pump 5 and a third metering pump 6, which are respectively used for quantitative delivery of carbon disulfide, ethanol and liquid alkali, and the metering pump is connected to the subsequent mixing pump 7 through a pipeline to ensure that the raw materials are delivered according to the set ratio;

[0095] Mixing pump 7: carbon disulfide, ethanol and liquid alkali outputted from the metering pump are introduced into the mixing pump 7 through pipelines. The mixing pump 7 preliminarily mixes the raw materials and delivers the mixed raw materials to the microchannel reactor 8;

[0096] Microchannel reactor 8: The output end of the mixing pump 7 is connected to the input end of the microchannel reactor 8. A microscale reaction channel is arranged inside the microchannel reactor 8 to improve the mass transfer and heat transfer efficiency of the reaction. The reactor can control the temperature and residence time to ensure that carbon disulfide, ethanol and liquid alkali react fully to generate sodium ethyl xanthate solution;

[0097] Concentration tank 9: The output end of the microchannel reactor 8 is connected to the concentration tank 9, which is used to receive the sodium ethyl xanthate solution and distill and concentrate it under reduced pressure. The concentration tank 9 is provided with two output ends, one of which is a recovery output end 14 for discharging unreacted raw materials and by-products; and the other end is a product output end 15 for discharging the concentrated sodium ethyl xanthate solution.

[0098] Condenser 10: The input end of the condenser 10 is connected to the recovery output end 14 of the concentration tank 9. The condenser 10 cools and recovers the discharged unreacted raw materials and by-products to ensure the effective utilization of the materials. The output end of the condenser 10 is connected to the receiving tank 13 to store the unreacted raw materials and by-products.

[0099] Centrifuge 11: The product output end 15 of the concentration kettle 9 is connected to the centrifuge 11 through a pipeline. The centrifuge 11 is used to receive the concentrated sodium ethyl xanthate solution and separate the sodium ethyl xanthate solid and the by-product liquid through centrifugal operation;

[0100] Dryer 12: The outlet end of the centrifuge 11 is connected to the dryer 12, and the dryer 12 is used to receive the separated sodium ethyl xanthate solid and dry it to obtain the final sodium ethyl xanthate product.

[0101] The method for preparing sodium ethyl xanthate based on microchannel technology is implemented by the above system, and comprises the following steps:

[0102] S1: Raw material configuration and transportation

[0103] Carbon disulfide is stored in a first storage tank 1, ethanol is stored in a second storage tank 2, and liquid caustic soda (40% sodium hydroxide solution) is stored in a third storage tank 3. Carbon disulfide is delivered to a mixing pump 7 through a first metering pump 4, ethanol is delivered to a second metering pump 5, and liquid caustic soda is delivered to a third metering pump 6, respectively. The feed molar equivalent ratio of the metering pumps is controlled to be 1:1.05:1, and the three raw materials are preliminarily mixed by the mixing pump 7;

[0104] S2: Microchannel reaction

[0105] The mixed raw materials in step S1 are fed into the microchannel reactor 8, the reaction temperature in the microchannel reactor 8 is controlled to be 5° C. to 10° C., and the reaction residence time is 95 minutes, so that carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution;

[0106] S3: Concentration

[0107] The sodium ethyl xanthate solution generated in step S2 is transported from the output end of the microchannel reactor 8 to the concentration kettle 9 (9), and distilled and concentrated under reduced pressure. Unreacted raw materials and by-products are discharged through the recovery output end 14 of the concentration kettle 9 and transported to the condenser 10 for recovery and treatment; the concentrated sodium ethyl xanthate solution is discharged through the product output end 15 of the concentration kettle 9;

[0108] S4: Centrifugal separation

[0109] The concentrated sodium ethyl xanthate solution in step S3 is sent to a centrifuge 11 to obtain sodium ethyl xanthate solid and byproduct liquid by centrifugal separation;

[0110] S5: Drying

[0111] The sodium ethyl xanthate solid obtained by centrifugation in step S4 is sent to a dryer 12 for drying under appropriate drying conditions to finally obtain a sodium ethyl xanthate product.

[0112] Product performance:

[0113] The yield and purity of the sodium ethyl xanthate product obtained in step S5 were measured, and the yield of the final product was measured to be 95.50%. The titration analysis was performed using the YS / T 271-1994 standard, and the purity of the product was 96.2%.

[0114] Embodiment 2:

[0115] The system used in Example 2 is the same as that in Example 1, and the method is as follows:

[0116] S1: Raw material configuration and transportation

[0117] Carbon disulfide is stored in a first storage tank 1, ethanol is stored in a second storage tank 2, and liquid alkali (40% sodium hydroxide solution) is stored in a third storage tank 3. Carbon disulfide is transported to a mixing pump 7 through a first metering pump 4, ethanol is transported to a second metering pump 5, and liquid alkali is transported to a third metering pump 6. The feed molar equivalent ratio of the metering pumps is controlled to be 1:1.05:1.05, and the three raw materials are preliminarily mixed by the mixing pump 7.

[0118] S2: Microchannel reaction

[0119] The mixed raw materials in step S1 are fed into the microchannel reactor 8, and the reaction temperature in the microchannel reactor 8 is controlled to be 25° C. to 30° C., and the reaction residence time is 220 minutes, so that carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution.

[0120] S3: Concentration

[0121] The sodium ethyl xanthate solution generated in step S2 is transported from the output end of the microchannel reactor 8 to the concentration kettle 9 for distillation and concentration under reduced pressure. Unreacted raw materials and by-products are discharged through the recovery output end 14 of the concentration kettle 9 and transported to the condenser 10 for recovery and treatment; the concentrated sodium ethyl xanthate solution is discharged through the product output end 15 of the concentration kettle 9.

[0122] S4: Centrifugal separation

[0123] The sodium ethyl xanthate solution concentrated in step S3 is sent to the centrifuge 11 to obtain sodium ethyl xanthate solid and by-product liquid by centrifugal separation.

[0124] S5: Drying

[0125] The sodium ethyl xanthate solid obtained by centrifugation in step S4 is sent to a dryer 12 for drying under appropriate drying conditions to finally obtain a sodium ethyl xanthate product.

[0126] Product performance:

[0127] The yield and purity of the sodium ethyl xanthate product obtained in step S5 were measured, and the yield of the final product was measured to be 96.30%. The titration analysis was performed using the YS / T 271-1994 standard, and the purity of the product was 97.1%.

[0128] Embodiment 3:

[0129] The system used in Example 3 is the same as that in Example 1, and the method is as follows:

[0130] S1: Raw material configuration and transportation

[0131] Carbon disulfide is stored in a first storage tank 1, ethanol is stored in a second storage tank 2, and liquid alkali (50% sodium hydroxide solution) is stored in a third storage tank 3. Carbon disulfide is transported to a mixing pump 7 through a first metering pump 4, ethanol is transported to a second metering pump 5, and liquid alkali is transported to a third metering pump 6. The feed molar equivalent ratio of the metering pumps is controlled to be 1:1.1:1.1, and the three raw materials are preliminarily mixed using the mixing pump 7.

[0132] S2: Microchannel reaction

[0133] The mixed raw materials in step S1 are fed into the microchannel reactor 8, and the reaction temperature in the microchannel reactor 8 is controlled to be 0° C. and the reaction residence time is 240 minutes, so that carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution.

[0134] S3: Concentration

[0135] The sodium ethyl xanthate solution generated in step S2 is transported from the output end of the microchannel reactor 8 to the concentration kettle 9 for distillation and concentration under reduced pressure. Unreacted raw materials and by-products are discharged through the recovery output end 14 of the concentration kettle 9 and transported to the condenser 10 for recovery and treatment; the concentrated sodium ethyl xanthate solution is discharged through the product output end 15 of the concentration kettle 9.

[0136] S4: Centrifugal separation

[0137] The sodium ethyl xanthate solution concentrated in step S3 is sent to the centrifuge 11 to obtain sodium ethyl xanthate solid and by-product liquid by centrifugal separation.

[0138] S5: Drying

[0139] The sodium ethyl xanthate solid obtained by centrifugation in step S4 is sent to a dryer 12 for drying under appropriate drying conditions to finally obtain a sodium ethyl xanthate product.

[0140] Product performance:

[0141] The yield and purity of the sodium ethyl xanthate product obtained in step S5 were measured, and the yield of the final product was measured to be 93.20%. The titration analysis was performed using the YS / T 271-1994 standard, and the purity of the product was 94.8%.

[0142] Embodiment 4:

[0143] The system used in Example 4 is the same as that in Example 1, and the method is as follows:

[0144] S1: Raw material configuration and transportation

[0145] Carbon disulfide is stored in a first storage tank 1, ethanol is stored in a second storage tank 2, and liquid alkali (30% sodium hydroxide solution) is stored in a third storage tank 3. Carbon disulfide is transported to a mixing pump 7 through a first metering pump 4, ethanol is transported to a second metering pump 5, and liquid alkali is transported to a third metering pump 6. The feed molar equivalent ratio of the metering pumps is controlled to be 1:1:1, and the three raw materials are preliminarily mixed by the mixing pump 7.

[0146] S2: Microchannel reaction

[0147] The mixed raw materials in step S1 are fed into the microchannel reactor 8, and the reaction temperature in the microchannel reactor 8 is controlled to be 45° C. and the reaction residence time is 1 minute, so that carbon disulfide, ethanol and liquid alkali react in the microchannel to generate sodium ethyl xanthate solution.

[0148] S3: Concentration

[0149] The sodium ethyl xanthate solution generated in step S2 is transported from the output end of the microchannel reactor 8 to the concentration kettle 9 for distillation and concentration under reduced pressure. Unreacted raw materials and by-products are discharged through the recovery output end 14 of the concentration kettle 9 and transported to the condenser 10 for recovery and treatment; the concentrated sodium ethyl xanthate solution is discharged through the product output end 15 of the concentration kettle 9.

[0150] S4: Centrifugal separation

[0151] The sodium ethyl xanthate solution concentrated in step S3 is sent to the centrifuge 11 to obtain sodium ethyl xanthate solid and by-product liquid by centrifugal separation.

[0152] S5: Drying

[0153] The sodium ethyl xanthate solid obtained by centrifugation in step S4 is sent to a dryer 12 for drying under appropriate drying conditions to finally obtain a sodium ethyl xanthate product.

[0154] Product performance:

[0155] The yield and purity of the sodium ethyl xanthate product obtained in step S5 were measured, and the yield of the final product was measured to be 90.50%. The titration analysis was performed using the YS / T 271-1994 standard, and the purity of the product was 93.5%.

[0156] Product Verification:

[0157] Take 10g of industrial ethyl xanthate and put it into a conical flask; then add 20g of anhydrous ethanol and mix well, a white precipitate will appear at the bottom of the flask; prepare a Büchner funnel and filter paper, adjust the switch of the vacuum pump to a suitable vacuum degree; open the stopper on the filter bottle and pour the mixed solution to be filtered into the Büchner funnel; turn on the vacuum pump and use the vacuum suction to filter the filtrate through the filter paper Büchner funnel at the upper end into the suction filtration bottle at the lower end; after the filtration is completed, turn off the vacuum pump and take out the suction filtration bottle. The solution obtained by suction filtration is concentrated, dried and crystallized by vacuum rotary evaporation to obtain a relatively pure ethyl xanthate product, and its infrared spectrum is measured, such as Figure 2 shown.

[0158] Similarly, the infrared spectra of the products obtained in the above-mentioned embodiments 1-4 of the present invention were measured. Figure 2 shown by Figure 2 The analysis shows that the characteristic peak of C=S is a strong peak at 1700-1500cm -1 Between, 1618cm -1 The peak is the C=S vibration peak, proving the existence of C=S, with medium intensity; 1280~1100cm -1 The interval peak corresponds to COC, 1174 cm -1The peak at 1042cm should be COC; -1 It is the CO vibration peak. By comparing the infrared spectrum of the product in the above embodiment with the infrared spectrum of the industrial pure product, the two are highly similar, and the peaks are basically consistent, which further verifies that the method and system of the present invention can produce a sodium ethyl xanthate product with high yield and high purity.

[0159] Through the above embodiments, it is further proved that the present invention provides a system and method for preparing sodium ethyl xanthate based on microchannel technology. The method of the present invention breaks through the limitations of traditional preparation processes in mass transfer, heat transfer, reaction control and product quality, and significantly improves reaction efficiency, product purity and production safety; the core of the system and method in the present invention is to adopt microchannel reaction technology, utilize its efficient mass transfer and heat transfer performance and controllable microscale reaction environment, and realize precise control of reaction conditions, thereby greatly reducing the occurrence of side reactions, reducing the amount of by-products generated, and making the product quality more stable and reliable; compared with traditional kettle reactors or kneading machine processes, the modular design of microchannel reactors decomposes the reaction process into efficient and controllable continuous operations, which not only improves the reaction efficiency, but also reduces the energy consumption and environmental pollution in the production process. At the same time, the system of the present invention combines the synergistic effect of metering pumps, mixing pumps, concentration kettles, centrifuges, dryers and other equipment to solve the problems of uneven raw material transportation, difficult to control reaction conditions, and low concentration and separation efficiency in traditional processes, and realizes the integrated and efficient production of sodium ethyl xanthate from reaction to product.

[0160] In terms of technical advantages, the present invention has the following significant advantages:

[0161] Efficient mass and heat transfer: The microscale channel design of the microchannel reactor greatly improves the mass and heat transfer efficiency of the reactants, ensures uniform and thorough reactions, and reduces the generation of by-products caused by local overheating or incomplete reactions.

[0162] Precise reaction control: By strictly controlling the reaction temperature, pressure and residence time of the microchannel reactor, the reaction conditions can be optimized and the product yield and purity can be improved.

[0163] High safety: The design of the microchannel reactor is inherently safe, which effectively reduces the risk of flammability and explosion during the synthesis of xanthate and significantly improves the safety of production operations.

[0164] Environmentally friendly: Unreacted raw materials and by-products are recovered and recycled through the condenser, reducing the waste of raw materials and waste emissions.

[0165] The product has excellent performance: as verified by the examples, the sodium ethyl xanthate product produced by the present invention has high yield and high purity, and can meet the strict requirements of industrial applications.

[0166] In summary, the present invention is not only innovative in reaction technology and system integration, but also effectively solves the problems of low reaction efficiency, high pollution and high operation risk in the prior art, and provides a safe, efficient and environmentally friendly solution for the industrial preparation of sodium ethyl xanthate, which has significant economic value and broad application prospects.

[0167] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0168] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0169] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A system for preparing sodium ethyl xanthate based on microchannel technology, characterized in that: The system consists of the following parts: The first storage tank (1), the second storage tank (2), and the third storage tank (3) are respectively used to store the reaction raw materials carbon disulfide, ethanol, and liquid alkali; A mixing pump (7): the input end of the mixing pump (7) is connected to the output ends of the first storage tank (1), the second storage tank (2) and the third storage tank (3), and is used to mix carbon disulfide, ethanol and liquid alkali; Microchannel reactor (8): the input end of the microchannel reactor (8) is connected to the output end of the mixing pump (7), and is used to receive the mixed reaction raw materials and react at a set temperature and residence time to generate a sodium ethyl xanthate solution; A concentration kettle (9): the input end of the concentration kettle (9) is connected to the output end of the microchannel reactor (8), and is used to perform reduced pressure distillation and concentration on the sodium ethyl xanthate solution generated by the reaction of the microchannel reactor (8). The concentration kettle (9) is provided with a recovery output end and a product output end; Condenser (10): the input end of the condenser (10) is connected to the recovery output end (14) of the concentration kettle (9) for recovering unreacted raw materials and by-products; Centrifuge (11): the input end of the centrifuge (11) is connected to the product output end (15) of the concentration kettle (9), and is used to separate the concentrated sodium ethyl xanthate; Dryer (12): The input end of the dryer (12) is connected to the output end of the centrifuge (11) and is used to dry the separated sodium ethyl xanthate to obtain the final product.

2. The system for preparing sodium ethyl xanthate based on microchannel technology according to claim 1, characterized in that: The output ends of the first storage tank (1), the second storage tank (2) and the third storage tank (3) are respectively connected to the first metering pump (4), the second metering pump (5) and the third metering pump (6) in a one-to-one correspondence; the output ends of the first metering pump (4), the second metering pump (5) and the third metering pump (6) are connected to the input end of the mixing pump (7); and the output end of the condenser (10) is connected to a receiving tank (13).

3. A method for preparing sodium ethyl xanthate based on microchannel technology, characterized in that: The method is implemented by the system according to any one of claims 1 to 2, comprising the following steps: S1: Raw material preparation and transportation: Carbon disulfide, ethanol and liquid alkali are stored in a first storage tank (1), a second storage tank (2) and a third storage tank (3), respectively, and transported to a mixing pump (7) according to a preset molar equivalent ratio, and preliminarily mixed in the mixing pump (7); S2: microchannel reaction: the raw materials mixed in step S1 are fed into a microchannel reactor (8), and the reaction temperature and reaction residence time in the microchannel reactor (8) are controlled to allow carbon disulfide, ethanol and liquid alkali to react in the microchannel to generate a sodium ethyl xanthate solution; S3: Concentration treatment: The sodium ethyl xanthate solution generated in step S2 is output from the microchannel reactor (8) to the concentration kettle (9), and distilled and concentrated under reduced pressure conditions, and unreacted raw materials and by-products are discharged from the recovery output end (14) of the concentration kettle (9), and recovered through the condenser (10), and the concentrated sodium ethyl xanthate solution is discharged from the product output end (15) of the concentration kettle (9); S4: centrifugal separation: sending the concentrated sodium ethyl xanthate solution in step S3 into a centrifuge (11), and separating the sodium ethyl xanthate solid and the by-product liquid by the centrifuge (11); S5: Drying treatment: The sodium ethyl xanthate solid separated by the centrifuge in step S4 is sent to a dryer (12), and the drying conditions are controlled to perform drying treatment to obtain the final sodium ethyl xanthate product.

4. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 3, characterized in that: In the step S1, the liquid alkali is sodium hydroxide, and the concentration of the sodium hydroxide is 30-50%.

5. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 3, characterized in that: In the step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid alkali is 1:(1-1.1):(1-1.1).

6. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 5, characterized in that: In the step S1, the molar equivalent ratio of carbon disulfide, ethanol and liquid caustic soda is 1:1.05:1.

05.

7. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 3, characterized in that: In the step S2, the reaction temperature is 0-45°C, and the reaction residence time is 1-240 min.

8. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 7, characterized in that: In step S2, the reaction temperature is 25-30°C, and the reaction residence time is 220 min.

9. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 3, characterized in that: In step S2, the hydraulic diameter in the microchannel reactor is 100-6000 microns.

10. The method for preparing sodium ethyl xanthate based on microchannel technology according to claim 3, characterized in that: In the step S2, the reaction formula of the microchannel reaction is: C2H5OH+NaOH+CS2→C2H5OCSNa+H2O.

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