A microchannel reactor based chlorinated paraffin production system

Abstract

The application discloses a chlorinated paraffin preparation system based on a micro-channel reactor, which comprises a feeding mechanism, a reaction mechanism and a tail gas treatment mechanism, the reaction mechanism comprises a micro-channel reactor and a refining tank group, the feeding mechanism is used for feeding chlorine and chlorinated paraffin into the micro-channel reactor, the micro-channel reactor is connected with the refining tank group in series, the micro-channel reactor is used for the reaction of chlorinated paraffin and chlorine, the refining tank is used for the reaction of residual chlorine and chlorinated paraffin, and the refining tank group is connected with an air compressor, the advanced micro-channel structure reactor is adopted, chlorine and liquid wax need to be filtered to remove impurities before entering the micro-channel reactor, then enter the micro-channel reactor, the whole process adopts light catalytic reaction, circulating water is used for accurate temperature control, and finally qualified products can be produced, so that the reaction efficiency is higher, the cycle is shorter, the energy consumption is lower, and the temperature control is more accurate.

Description

Technical Field

[0001] This invention is a chlorinated paraffin preparation system based on a microchannel reactor. Background Technology

[0002] There are two main production processes for chlorinated paraffin products in my country: intermittent chlorination and continuous chlorination. Based on the chlorination method, these include thermal chlorination, photochlorination, and catalytic chlorination. This project adopts a mature continuous batch chlorination process combining photochlorination and thermal chlorination. Photochlorination produces products with lower reaction temperatures and shorter reaction times, resulting in lower chlorine and liquid paraffin consumption compared to thermal chlorination. The products also exhibit stable quality and lighter color.

[0003] These traditional processes all utilize reaction vessels for production, but reaction vessels differ from microchannel reactors. A microchannel reactor is a miniaturized reaction vessel fabricated using microfluidic technology. Its internal walls employ micron-level channel structures to achieve mixing, mass transfer, and reaction of reactants. Compared to traditional batch reactors, microchannel reactors offer advantages such as rapid heat and mass transfer, high-efficiency reaction, and energy saving and emission reduction. Therefore, they are widely used in chemical, pharmaceutical, and biological fields. Thus, how to apply microchannel reactors to the production of chlorinated paraffin is a current challenge. Summary of the Invention:

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a chlorinated paraffin preparation system based on a microchannel reactor.

[0005] A chlorinated paraffin preparation system based on a microchannel reactor includes a feeding mechanism, a reaction mechanism, and a tail gas treatment mechanism. The reaction mechanism includes a microchannel reactor and a refining tank assembly. The feeding mechanism is used to feed chlorine and chlorinated paraffin into the microchannel reactor. The microchannel reactor is connected in series with the refining tank assembly. The microchannel reactor is used for the reaction of chlorinated paraffin and chlorine. The refining tank assembly is used for the reaction of residual chlorine and chlorinated paraffin. The refining tank assembly is connected to an air compressor.

[0006] To prevent overheating inside the reaction mechanism, the microchannel reactor includes at least one reaction unit, which includes a reaction plate and two heat-conducting plates. The reaction plate is provided with a reaction channel, and the heat-conducting plates are provided with heat-conducting channels. The reaction plate is located between the two heat-conducting plates. An ultraviolet light irradiation device is provided in the reaction channel. The reaction channel is used for the reaction of chlorinated paraffin and chlorine. Cooling water is provided in the heat-conducting channels.

[0007] To ensure a stable feeding process, the feeding mechanism includes a liquid chlorine storage tank, a vaporizer, a wax oil storage tank, and a wax oil settling tank. The chlorine in the liquid chlorine storage tank is vaporized by the vaporizer and then enters the microchannel reactor. The chlorinated paraffin in the wax oil storage tank enters the microchannel reactor through the wax oil settling tank.

[0008] To prevent exhaust gas pollution, the exhaust gas treatment system includes a hydrochloric acid absorption tower, a hydrochloric acid storage tank, a sodium hypochlorite absorption tower, a sodium hypochlorite storage tank, and a chlorine absorption tower. The hydrochloric acid absorption tower is connected to the hydrochloric acid storage tank and the sodium hypochlorite absorption tower. The sodium hypochlorite absorption tower is connected to the sodium hypochlorite storage tank. The exhaust gas in the microchannel reactor and the purification tank enters the hydrochloric acid absorption tower and then enters the sodium hypochlorite absorption tower. The chlorine absorption tower is connected to the sodium hypochlorite absorption tower, the liquid chlorine storage tank, and the vaporizer. Water is added to the hydrochloric acid absorption tower, and sodium hydroxide is added to the sodium hypochlorite absorption tower and the chlorine absorption tower.

[0009] To prevent overheating inside the refining tank, the refining tank is connected to a cooler and a circulating pump. The liquid inside the refining tank flows out from the outlet at the bottom to the circulating pump, which then transports the liquid back to the refining tank after passing through the cooler.

[0010] Beneficial effects:

[0011] Compared with existing technologies, this invention uses an advanced microchannel structure reactor. Before entering the microchannel reactor, chlorine gas and liquid wax are filtered to remove impurities. The entire reaction is catalyzed by light and the temperature is accurately controlled by circulating water. Finally, qualified products can be produced. Thus, the reaction efficiency is higher, the cycle is shorter, the energy consumption is lower, and the temperature control is more accurate.

[0012] Chlorine gas is added in stages in a microchannel reactor to generate a reaction, maximizing the reaction of the reactants and increasing the total yield.

[0013] In addition, the advantages of using microchannel reactors also include:

[0014] High mass transfer rate: Due to the special structure of microchannels, reactants can be transported rapidly within the channels, thereby increasing the reaction rate.

[0015] High specific surface area and low mass diffusion distance: This helps to improve reaction efficiency and product purity.

[0016] Low mass transfer resistance: In traditional chemical reactors, mass transfer is often the bottleneck that limits the reaction rate, but in microchannel reactors, mass transfer resistance is low and mass transfer rate is high.

[0017] High heat and mass transfer efficiency: Due to their small size, microchannel reactors offer an extremely high surface area to volume ratio, allowing heat to be transferred to reactants more quickly, thereby increasing reaction rate and product yield. This facilitates rapid equilibrium of reaction temperature and concentration gradients, thus accelerating the chemical reaction rate.

[0018] Strict control of reaction conditions: Microchannel reactors enable precise control of reaction temperature, pressure, reactant molar ratio, and other conditions, which is beneficial for achieving high selectivity and high yield in chemical reactions.

[0019] Continuous production: Microchannel reactors facilitate continuous production of reactions, reduce batch-to-batch variations, and improve product quality consistency.

[0020] High safety performance: Microchannel reactors can effectively prevent the accumulation of hazardous substances and the runaway of reaction conditions, reducing the risk of explosion and leakage.

[0021] Energy saving and emission reduction: Due to its efficient heat and mass transfer characteristics, microchannel reactors can carry out reactions at lower temperatures and pressures, thereby reducing energy consumption and exhaust emissions.

[0022] Easy to scale up and down: The structure of microchannel reactors can be scaled up or down relatively easily, making it convenient to adjust the size of the reactor as needed.

[0023] Suitable for a variety of chemical reactions: Whether it is a simple material conversion or a complex polymerization, addition, elimination and other reactions, microchannel reactors show their unique advantages. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a chlorinated paraffin preparation system based on a microchannel reactor;

[0025] Figure 2 This is a schematic diagram of the internal reaction principle of a microchannel reactor;

[0026] Figure 3 This is an illustrative diagram of a microchannel reactor system for preparing chlorinated paraffin.

[0027] Figure 4 yes Figure 3 A table showing the content of the corresponding substances in numbers 1-5;

[0028] Figure 5 yes Figure 3 A table showing the content of the corresponding substances in items 6-10;

[0029] Figure 6 yes Figure 3 A table showing the content of the corresponding substances in items 11-15;

[0030] Figure 7 yes Figure 3 A table showing the content of the corresponding substances in items 16-20;

[0031] Figure 8 yes Figure 3 Tables showing the content of the corresponding substances in items 21-24;

[0032] In the diagram, 1 is a liquid chlorine storage tank, 2 is a vaporizer, 3 is a microchannel reactor, 4 is a refining tank, 5 is a hydrochloric acid storage tank, 6 is a hydrochloric acid absorption tower, 7 is a sodium hypochlorite absorption tower, 8 is a chlorine absorption tower, 9 is a sodium hypochlorite storage tank, 10 is an air compressor, 11 is a wax oil settling tank, 12 is a wax oil storage tank, 13 is a heat conduction channel, and 14 is a reaction channel. Detailed Implementation

[0033] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0034] like Figure 1-2 As shown, there is a liquid chlorine storage tank 1, a vaporizer 2, a microchannel reactor 3, a refining tank 4, a hydrochloric acid storage tank 5, a hydrochloric acid absorption tower 6, a sodium hypochlorite absorption tower 7, a chlorine absorption tower 8, a sodium hypochlorite storage tank 9, an air compressor 10, a wax oil settling tank 11, a wax oil storage tank 12, a heat conduction channel 13, and a reaction channel 14.

[0035] A microchannel reactor-based chlorinated paraffin preparation system includes a feeding mechanism, a reaction mechanism, and a tail gas treatment mechanism. The reaction mechanism includes a microchannel reactor 3 and a purification tank 4. The feeding mechanism is used to feed chlorine and chlorinated paraffin into the microchannel reactor 3. The microchannel reactor 3 and the purification tank 4 are connected in series. The microchannel reactor 3 is used for the reaction of chlorinated paraffin and chlorine. The purification tank 4 is used for the reaction of residual chlorine and chlorinated paraffin. The purification tank 4 is connected to an air compressor 10.

[0036] In this embodiment, the microchannel reactor 3 includes at least one reaction unit, which includes a reaction plate and two heat-conducting plates. The reaction plate is provided with a reaction channel 14, and the heat-conducting plates are provided with heat-conducting channels 13. The reaction plate is located between the two heat-conducting plates. An ultraviolet light irradiation device is provided in the reaction channel 14. The reaction channel 14 is used for the reaction of chlorinated paraffin and chlorine. The heat-conducting channels 13 are provided with flowing cooling water.

[0037] In this embodiment, the feeding mechanism includes a liquid chlorine storage tank, a vaporizer 2, a wax oil storage tank 12, and a wax oil settling tank 11. The chlorine gas in the liquid chlorine storage tank is vaporized by the vaporizer 2 and then enters the microchannel reactor 3. The chlorinated paraffin in the wax oil storage tank 12 enters the microchannel reactor 3 through the wax oil settling tank 11.

[0038] In this embodiment, the exhaust gas treatment mechanism includes a hydrochloric acid absorption tower 6, a hydrochloric acid storage tank 5, a sodium hypochlorite absorption tower 7, a sodium hypochlorite storage tank 9, and a chlorine absorption tower 8. The hydrochloric acid absorption tower 6 is connected to the hydrochloric acid storage tank 5 and the sodium hypochlorite absorption tower 7. The sodium hypochlorite absorption tower 7 is connected to the sodium hypochlorite storage tank 9. The exhaust gas in the microchannel reactor 3 and the purification tank 4 enters the hydrochloric acid absorption tower 6 and then enters the sodium hypochlorite absorption tower 7. The chlorine absorption tower 8 is connected to the sodium hypochlorite absorption tower 7, the liquid chlorine storage tank, and the vaporizer 2. Water is added to the hydrochloric acid absorption tower 6, and sodium hydroxide is added to the sodium hypochlorite absorption tower 7 and the chlorine absorption tower 8.

[0039] In this embodiment, the refining tank 4 is connected to the cooler and the circulation pump. The liquid in the refining tank 4 flows out from the outlet at the bottom to the circulation pump, and the circulation pump transports the liquid back to the refining tank 4 after passing through the cooler.

[0040] When using this chlorinated paraffin system, chlorine and paraffin are first filtered to remove impurities, and then both are transported to the reaction channel 14 of the microchannel reactor 3. The temperature is controlled by cooling water in the heat-conducting channel 13. After the reaction, they enter the refining tank 4 for further reaction, so that chlorine and paraffin can react fully. The waste gas generated in the microchannel reactor 3 and the refining tank 4 is recovered or treated into harmless gas by a waste treatment mechanism before being discharged.

[0041] like Figure 3-8 As shown, during operation, wax oil enters the microchannel reactor. In the microchannel reaction, a certain amount of chlorine gas is added at regular intervals to react with the wax oil. Serial number 2 represents wax oil entering the microchannel reactor through a pipe. Serial numbers 1, 5, 8, 11, 14, 17, and 20 represent chlorine gas entering the microchannel reactor. Serial numbers 3, 6, 9, 12, 15, 18, and 21 represent various gases being discharged from the microchannel reactor. Serial numbers 4, 7, 10, 13, 16, and 19 represent the finished products produced at each stage in the microchannel reactor. Serial number 22 represents the final product aggregate produced by the microchannel reactor. Serial number 24 represents the finished material output.

[0042] In the table, numbers 1, 2, 5, 8, 11, 14, 17, and 20 represent the content of substances entering the microchannel reactor at each stage; numbers 3, 6, 9, 12, 15, 18, and 21 represent the content of gases exiting the microchannel reactor at each stage; numbers 4, 7, 10, 13, 16, and 19 represent the content of finished products produced at each stage; number 22 represents the total amount of finished products produced in the microchannel reactor; and number 24 represents the final amount of finished products collected.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chlorinated paraffin preparation system based on a microchannel reactor, characterized in that, It includes a feeding mechanism, a reaction mechanism, and a tail gas treatment mechanism. The reaction mechanism includes a microchannel reactor and a refining tank assembly. The feeding mechanism is used to feed chlorine and chlorinated paraffin into the microchannel reactor. The microchannel reactor is connected in series with the refining tank assembly. The microchannel reactor is used for the reaction of chlorinated paraffin and chlorine. The refining tank assembly is used for the reaction of residual chlorine and chlorinated paraffin. The refining tank assembly is connected to an air compressor. The microchannel reactor includes at least one reaction unit, which includes a reaction plate and two heat-conducting plates. The reaction plate is provided with a reaction channel, and the heat-conducting plates are provided with heat-conducting channels. The reaction plate is located between the two heat-conducting plates. An ultraviolet light irradiation device is provided in the reaction channel. The reaction channel is used for the reaction of chlorinated paraffin and chlorine. Flowing cooling water is provided in the heat-conducting channel. The exhaust gas treatment system includes a hydrochloric acid absorption tower, a hydrochloric acid storage tank, a sodium hypochlorite absorption tower, a sodium hypochlorite storage tank, and a chlorine absorption tower. The hydrochloric acid absorption tower is connected to the hydrochloric acid storage tank and the sodium hypochlorite absorption tower. The sodium hypochlorite absorption tower is connected to the sodium hypochlorite storage tank. The exhaust gas from the microchannel reactor and the refining tank group enters the hydrochloric acid absorption tower and then enters the sodium hypochlorite absorption tower. The chlorine absorption tower is connected to the sodium hypochlorite absorption tower, the liquid chlorine storage tank, and the vaporizer. Water is added to the hydrochloric acid absorption tower, and sodium hydroxide is added to the sodium hypochlorite absorption tower and the chlorine absorption tower. The feeding mechanism includes a liquid chlorine storage tank, a vaporizer, a wax oil storage tank, and a wax oil settling tank. The chlorine gas in the liquid chlorine storage tank is vaporized by the vaporizer and then enters the microchannel reactor. The chlorinated paraffin in the wax oil storage tank enters the microchannel reactor through the wax oil settling tank.

2. The chlorinated paraffin preparation system based on a microchannel reactor according to claim 1, characterized in that, The refining tank assembly is connected to a cooler and a circulating pump. The liquid in the refining tank assembly flows out from the outlet at the bottom to the circulating pump, which then transports the liquid back to the refining tank assembly after passing through the cooler.

Images