Device for synthesizing vinyl chloride through micro-channel reactor
By combining a microchannel reactor with a mercury-free liquid catalyst, the pollution and catalyst loss problems in the traditional acetylene process were solved, and efficient and safe vinyl chloride synthesis was achieved.
Patent Information
- Application Number
- CN202422525607.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-18
AI Technical Summary
The traditional acetylene process has problems such as catalyst contamination, difficulty in removing reaction heat, local hot spots and catalyst carbon deposition. In addition, the cost of precious metal catalysts is high and the active components of non-precious metal catalysts are seriously lost.
A microchannel reactor is used to mix acetylene with raw materials through a jet mixer and pressurize them. A mercury-free liquid catalyst is used to react in the microchannel to produce vinyl chloride. The products are separated through gas-liquid separation equipment and the catalyst is recycled.
It achieves efficient synthesis of vinyl chloride under mild conditions, reduces the risk of side reactions, improves heat and mass transfer efficiency and reaction uniformity, and ensures safety performance.
Smart Images
Figure CN223299962U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vinyl chloride synthesis, in particular to a device for synthesizing vinyl chloride through a microchannel reactor. Background Art
[0002] Industrial vinyl chloride synthesis processes are primarily divided into the acetylene process and the ethylene process. In China, the coal-based acetylene process is the mainstream method for vinyl chloride synthesis. However, the mercury chloride catalyst used in this process causes severe environmental pollution, limiting its sustainable and healthy development. Although the industry has reduced mercury loss and emissions to some extent in recent years by reducing mercury content in catalysts and strengthening mercury sequestration, the fundamental problem of mercury pollution has not been resolved.
[0003] The traditional acetylene process is a gas-solid phase reaction process using a solid-supported catalyst. Research on mercury-free gas-solid phase catalysts has shown that precious metal catalysts offer high catalytic activity but are relatively expensive. While non-precious metal catalysts are inexpensive and economical, they suffer from significant loss of active components. Furthermore, the traditional acetylene process presents technical challenges such as difficulty removing reaction heat, surface overheating, localized hot spots, and carbon deposits on the catalyst. Utility Model Content
[0004] In view of the deficiencies in the prior art, the present invention provides a device for synthesizing vinyl chloride through a microchannel reactor, which solves the problems raised by the above-mentioned background technology.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A device for synthesizing vinyl chloride through a microchannel reactor, comprising a boosting device, a mixing reaction unit and a gas-liquid separation device, wherein the input end of the boosting device is connected to a raw material pipeline, the output end of the boosting device and the input end of the mixing reaction unit are connected through a first pipeline, the output end of the mixing reaction unit and the gas-liquid separation device are connected through a second pipeline, the mixing reaction unit comprises a jet mixer, a preheating unit, a microchannel reactor and a cooling unit, the input end of the jet mixer is connected to an acetylene pipeline, and the input end of the liquid circulation pipeline is connected to a liquid catalyst pipeline.
[0006] Preferably, the output end of the gas-liquid separation device is connected to a gas output pipeline and a liquid circulation pipeline respectively.
[0007] Preferably, the input end of the jet mixer and the output end of the boosting device are connected through the first pipe, and the output end of the cooling unit and the input end of the gas-liquid separation device are connected through the second pipe.
[0008] Preferably, the jet mixer, the preheating unit, the microchannel reactor and the cooling unit are all connected to each other through a third pipeline.
[0009] Preferably, one end of the liquid circulation pipeline away from the gas-liquid separation device is connected to the liquid catalyst pipeline.
[0010] Beneficial effects
[0011] The utility model provides a device for synthesizing vinyl chloride through a microchannel reactor. Compared with the prior art, it has the following advantages:
[0012] 1. This process for synthesizing vinyl chloride through a microchannel reactor pressurizes the raw materials and then introduces acetylene into the system through a jet mixer, effectively mixing the two raw materials and increasing the pressure of the mixed raw materials, thus solving the safety issues caused by pressurizing acetylene alone.
[0013] 2. The process of synthesizing vinyl chloride through a microchannel reactor, by setting up a microchannel reactor, can proceed rapidly under milder conditions, while reducing the accumulation of heat and substances, and lowering the risk of side reactions. It has the advantages of high heat and mass transfer efficiency, precise fluid control, uniform reaction conditions, and good safety performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the workflow of the present utility model.
[0015] In the figure: 1. Booster equipment; 2. Mixing reaction unit; 3. Gas-liquid separation equipment; 4. Jet mixer; 5. Preheating unit; 6. Microchannel reactor; 7. Cooling unit; 8. Raw material pipeline; 9. Gas output pipeline; 10. Liquid circulation pipeline; 11. Acetylene pipeline; 12. First pipeline; 13. Second pipeline; 14. Third pipeline; 15. Liquid catalyst pipeline. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] See also Figure 1The utility model provides a technical solution: a device for synthesizing vinyl chloride through a microchannel reactor, comprising a boosting device 1, a mixing reaction unit 2 and a gas-liquid separation device 3, the input end of the boosting device 1 is connected to a raw material pipeline 8, the output end of the boosting device 1 and the input end of the mixing reaction unit 2 are connected through a first pipeline 12, the output end of the mixing reaction unit 2 and the gas-liquid separation device 3 are connected through a second pipeline 13, the mixing reaction unit 2 comprises a jet mixer 4, a preheating unit 5, a microchannel reactor 6 and a cooling unit 7, the input end of the jet mixer 4 is connected to an acetylene pipeline 11, and the input end of the liquid circulation pipeline 10 is connected to a liquid catalyst pipeline 15, the raw material is pressurized by the boosting device 1, then enters the interior of the mixing reaction unit 2 for reaction, and then enters the gas-liquid separation device 3 for gas-liquid separation.
[0018] Furthermore, the output ends of the gas-liquid separation device 3 are respectively connected to a gas output pipeline 9 and a liquid circulation pipeline 10 , the separated vinyl chloride gas enters the gas output pipeline 9 , and the separated liquid catalyst enters the liquid circulation pipeline 10 .
[0019] Furthermore, the input end of the jet mixer 4 and the output end of the boosting device 1 are connected via a first pipe 12, and the output end of the cooling unit 7 and the input end of the gas-liquid separation device 3 are connected via a second pipe 13. The raw material is pressurized using the boosting device 1, and acetylene is brought into the preheating unit 5 through the jet mixer 4. This effectively mixes the raw material and acetylene, and achieves the purpose of increasing the pressure of the mixed raw material, thereby solving the safety problem caused by pressurizing acetylene alone. Furthermore, the jet mixer 4, the preheating unit 5, the microchannel reactor 6 and the cooling unit 7 are all connected to each other through a third pipe 14. Acetylene is brought into the preheating unit 5 through the jet mixer 4, and the mixed mixture is heated by the preheating unit 5. The heated mixture and the liquid catalyst are injected into the microchannel reactor 6 together. The mixture reacts efficiently in the microchannel reactor 6 under the action of the liquid catalyst to generate vinyl chloride. The generated vinyl chloride and the liquid catalyst are injected into the cooling unit 7 for cooling. This reduces the accumulation of heat and substances and reduces the risk of side reactions. It has the advantages of high heat and mass transfer efficiency, precise fluid control, uniformity of reaction conditions, and good safety performance.
[0020] Furthermore, the end of the liquid circulation pipe 10 away from the gas-liquid separation device 3 is connected to the liquid catalyst pipe 15, so that the liquid catalyst can re-enter the interior of the microchannel reactor 6 for recycling.
[0021] During operation, step 1, the raw material is pressurized using the pressurizing device 1, and acetylene is brought into the preheating unit 5 through the jet mixer 4;
[0022] Step 2: Control the ratio of raw materials to acetylene to be 1.05-1.1:1 in molar ratio, and then heat the mixed mixture to 90-160° C. through the preheating unit 5;
[0023] Step 3: injecting the heated mixture and the liquid catalyst into the microchannel reactor 6, wherein the mixture reacts efficiently in the microchannel reactor 6 under the action of the liquid catalyst to produce vinyl chloride;
[0024] Step 4: inject the generated vinyl chloride and liquid catalyst into the cooling unit 7 to cool to 130-150°C, and then pass through the gas-liquid separation device 3 for gas-liquid separation. The separated liquid catalyst is recycled, and the vinyl chloride gas exits the device;
[0025] The raw materials are hydrogen chloride, ethylene dichloride, etc. but are not limited to the above raw materials, and different boosting equipment 1 can be used to boost the pressure according to the different raw materials. For example, hydrogen chloride is boosted to 0.16 MPa using a gas compressor, and ethylene dichloride is boosted to 0.6 MPa using a liquid booster pump. The liquid catalyst is a mercury-free liquid catalyst.
[0026] At the same time, the contents not described in detail in this specification belong to the existing technology well known to those skilled in the art.
[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.
[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A device for synthesizing vinyl chloride by a microchannel reactor, comprising a pressurizing device (1), a mixing reaction unit (2) and a gas-liquid separation device (3), characterized in that: The input end of the boosting device (1) is connected to a raw material pipeline (8), the output end of the boosting device (1) and the input end of the mixing reaction unit (2) are connected via a first pipeline (12), the output end of the mixing reaction unit (2) and the gas-liquid separation device (3) are connected via a second pipeline (13), the mixing reaction unit (2) comprises a jet mixer (4), a preheating unit (5), a microchannel reactor (6) and a cooling unit (7), the input end of the jet mixer (4) is connected to an acetylene pipeline (11), the output end of the gas-liquid separation device (3) is respectively connected to a gas output pipeline (9) and a liquid circulation pipeline (10), and the input end of the liquid circulation pipeline (10) is connected to a liquid catalyst pipeline (15).
2. The device for synthesizing vinyl chloride by a microchannel reactor according to claim 1, characterized in that: The input end of the jet mixer (4) and the output end of the boosting device (1) are connected via the first pipe (12), and the output end of the cooling unit (7) and the input end of the gas-liquid separation device (3) are connected via the second pipe (13).
3. The device for synthesizing vinyl chloride by a microchannel reactor according to claim 2, characterized in that: The jet mixer (4), the preheating unit (5), the microchannel reactor (6) and the cooling unit (7) are all connected to each other via a third pipe (14).
4. The device for synthesizing vinyl chloride by a microchannel reactor according to claim 3, characterized in that: One end of the liquid circulation pipe (10) away from the gas-liquid separation device (3) is connected to the liquid catalyst pipe (15).