Gas-liquid catalytic reaction device and system

Abstract

The present invention relates to a gas-liquid catalytic reaction device and a reaction system composed of a certain partial implementation scheme of the reaction device as a unit. The gas-liquid catalytic reaction device comprises: a reaction liquid storage tank provided with reaction liquid input and output pipelines, a catalytic reactor, a heat exchanger, and a back pressure valve. The heat exchanger is arranged between the catalytic reactor and the back pressure valve, and the back pressure valve is connected to a liquid outlet pipeline. Between the output pipeline of the reaction liquid storage tank and the input pipeline of the catalytic reactor, at least one end close to the reaction liquid storage tank and one end close to the catalytic reactor are provided with an infusion pump, respectively, a gas-liquid mixer and a gas-liquid mixed fluid storage device are provided between the infusion pumps at both ends, and the gas-liquid mixer is connected to the gas transmission pipeline. The reaction liquid storage tank, the gas-liquid mixer, the gas-liquid mixed fluid storage device and other parts thereof are kept in a low pressure or normal pressure state, so that the material storage part and the reaction part are effectively isolated, so that the safety factor of the entire catalytic reaction device and the system is significantly improved.

Description

Technical Field

[0001] The present invention relates to the field of chemical catalytic reaction devices, and in particular to a device and system that can be well applied to perform gas-liquid mixed catalytic reaction under high temperature and high pressure conditions. Background Art

[0002] In chemical synthesis, the more commonly used catalytic hydrogenation reactions and catalytic oxidation reactions involve mass transfer and heat transfer of solid, liquid and gas phases. At present, metals or metal complexes such as palladium, platinum, rhodium, iridium, nickel, iron, cobalt, copper, etc. that are immobilized on substrates such as powdered or granular activated carbon, alumina, diatomaceous earth, etc. are usually used as catalysts. In the application scenario, the gas, liquid and catalyst are fully stirred for a long time in a pressure-resistant reactor to allow the three phases to react.

[0003] The reaction devices involved in the implementation of gas-liquid mixed catalytic reactions are currently more commonly used stirred pressure reactors and loop jet reactors. Among them, stirred pressure reactors are large in size and have poor safety. They are also special reaction equipment that is under key safety supervision. At the same time, their gas-liquid mixing effect is also poor, and their heat transfer efficiency is low. They are generally only suitable for batch reactions. The loop jet reactor will destroy the structure of the catalyst during the circulation process and is not suitable for gas-liquid reactions with solids as catalysts. The entire pipeline is under great pressure, so its safety is slightly poor. Summary of the invention

[0004] In view of the problem that the current gas-liquid mixed catalytic reaction device has poor safety due to the fact that the material storage part and the reaction part are not effectively separated or the pipeline is subjected to high pressure, the present invention provides a gas-liquid catalytic reaction device and a reaction system based on the reaction device, which can achieve effective isolation of the material storage part and the reaction part while normally realizing the catalytic reaction, thereby significantly improving the safety factor of the entire catalytic reaction device and the system.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A gas-liquid catalytic reaction device, comprising:

[0007] The reaction liquid storage tank is provided with a reaction liquid input pipeline and an output pipeline.

[0008] A catalytic reactor, a heat exchanger, and a back-pressure valve. The heat exchanger is arranged between the catalytic reactor and the back-pressure valve and is used to cool the gas-liquid mixed fluid flowing out of the catalytic reactor. The back-pressure valve is connected to a liquid outlet pipeline.

[0009] Between the output pipeline of the reaction liquid storage tank and the input pipeline of the catalytic reactor, at least one infusion pump is provided at one end close to the reaction liquid storage tank and one end close to the catalytic reactor, and a gas-liquid mixer and a gas-liquid mixed fluid storage device are provided between the infusion pumps at both ends. The gas-liquid mixer is connected to the gas transmission pipeline. Generally, a flow regulating valve is provided on the gas transmission pipeline connected to the gas-liquid mixer to adjust the gas flow rate sent into the gas-liquid mixer.

[0010] In the above implementation scheme, the reaction liquid storage tank, gas-liquid mixer, gas-liquid mixed fluid storage device and other parts are kept at low pressure or normal pressure, and only the high-pressure area is formed in the section from the infusion pump to the back pressure valve near the catalytic reactor. Because the liquid holding volume in this part of the high-pressure area is very small, the safety is extremely high. At the same time, in the pipeline, the temperature of the liquid or gas flowing through the non-high-pressure area is relatively low, which also helps to ensure the safety of the entire equipment during operation. The gas source is not required to be a high-pressure gas source.

[0011] In order to control excessive pressure in the catalytic reactor, a safety valve is provided on the pipeline between the catalytic reactor and the infusion pump close thereto, and a pressure relief pipe is connected to the safety valve.

[0012] In a specific embodiment, a gas-liquid separator may also be included, which is connected to the gas pipeline and the reaction liquid storage tank, and the gas-liquid mixer, the gas-liquid mixed fluid storage device and the gas-liquid separator are respectively connected through a gas pipeline. A flow regulating valve provided on the connecting pipeline from the gas pipeline to the gas-liquid mixer, which is used to control the gas flow rate sent into the gas-liquid mixer, is installed on the connecting pipeline between the gas-liquid mixer and the gas-liquid separator. The gas-liquid separator and the pipeline connecting the gas-liquid separator and the gas-liquid mixed fluid storage device can effectively recover the unreacted gas, ensure the stoichiometric utilization of the gas source gas, and avoid waste.

[0013] In a specific implementation, one port of the back pressure valve is provided with a pipeline connected in parallel with the liquid outlet pipeline and connected to the gas-liquid separator; a stop valve is provided on the liquid outlet pipeline and the pipeline connected in parallel with the liquid outlet pipeline. In this solution, batch cyclic reaction can be achieved by controlling the opening and closing of the two stop valves.

[0014] In a specific embodiment, the gas-liquid mixer can be selected as a venturi mixer, including the case of single use or multiple simultaneous use. In the case of using multiple venturi mixers at the same time, the multiple venturi mixers can be in the form of series connection or parallel connection, or even in the form of a mixture of series connection and parallel connection. In addition, when there are multiple venturi mixers, a flow regulating valve is respectively set on the pipeline of each venturi mixer connected to the gas pipeline to accurately control the gas flow delivered to each venturi mixer and accurately control the gas-liquid ratio of each mixer.

[0015] In a specific embodiment, the catalytic reactor is a fixed bed reactor, such as an axial adiabatic fixed bed reactor, a radial adiabatic fixed bed reactor, or a shell-and-tube fixed bed reactor.

[0016] Furthermore, when a tube-in-tube fixed bed reactor is selected, a heat exchange medium interlayer is provided on the outside of each tube. At this time, the specific surface area of ​​the reactor is much larger than that of the reactor, the heat exchange is rapid, the temperature control is accurate, and the temperature runaway phenomenon is not easy to occur during the reaction process, which has high controllability. The gas-liquid mixed fluid forms a fixed retention time in the reaction tube of the tube-in-tube fixed bed reactor, and the reaction process is precisely controllable, accurate to seconds.

[0017] Furthermore, when a shell-and-tube fixed bed reactor is selected, a heat exchanger is provided on the periphery of the shell-and-tube fixed bed reactor, and the heat exchanger can transfer the heat of the mixed fluid at the outlet of the shell-and-tube fixed bed reactor to the mixed fluid at the inlet of the shell-and-tube fixed bed reactor, that is, a heat exchange device is added between the inlet pipe and the outlet pipe of the reaction mixed fluid, and the reaction liquid is used to heat the reaction liquid, which can effectively recover heat, reduce energy consumption, and help to improve the temperature control accuracy of the high temperature and high pressure areas.

[0018] A gas-liquid catalytic reaction system, characterized in that it comprises a plurality of stages of catalytic reaction units, wherein a single-stage catalytic reaction unit comprises:

[0019] The reaction liquid storage tank is provided with a reaction liquid input pipeline and an output pipeline.

[0020] A catalytic reactor, a heat exchanger, and a back-pressure valve. The heat exchanger is arranged between the catalytic reactor and the back-pressure valve and is used to cool the gas-liquid mixed fluid flowing out of the catalytic reactor. The back-pressure valve is connected to a liquid outlet pipeline.

[0021] Between the output pipeline of the reaction liquid storage tank and the input pipeline of the catalytic reactor, an infusion pump is provided at least at one end close to the reaction liquid storage tank and at one end close to the catalytic reactor, and a gas-liquid mixer and a gas-liquid mixed fluid storage device are provided between the infusion pumps at both ends, and the gas-liquid mixer is connected to the gas pipeline.

[0022] The reaction liquid input pipeline on the reaction liquid storage tank provided in the first-stage catalytic reaction unit at the starting end is connected to the raw liquid source, and the gas transmission pipelines in each stage of the catalytic reaction unit are connected to the gas source. A gas-liquid separator is provided between two adjacent stages of the catalytic reaction units, respectively, for connecting the liquid outlet pipeline in the previous stage of the catalytic reaction unit, the reaction liquid input pipeline on the reaction liquid storage tank in the next stage of the catalytic reaction unit, and the gas source pipeline.

[0023] In the implementation scheme of the above catalytic reaction system, the reaction liquid storage tank, gas-liquid mixer, gas-liquid mixed fluid storage device and other parts in the catalytic reaction units at each level are kept at low pressure or normal pressure, and only the high-pressure area is formed in the section from the infusion pump to the back pressure valve close to the catalytic reactor. Because the liquid holding volume in this part of the high-pressure area is very small, the safety is extremely high. At the same time, in the pipeline, the temperature of the liquid or gas flowing through the non-high-pressure area is relatively low, which also helps to ensure the safety of the entire equipment during operation. The gas source is not required to be a high-pressure gas source.

[0024] In order to control excessive pressure in each catalytic reactor, a safety valve is provided on the pipeline between each catalytic reactor and the infusion pump close thereto.

[0025] In the above-mentioned catalytic reaction system, the gas-liquid mixer can be partially selected as a Venturi mixer, and the catalytic reactor is a fixed bed reactor. If it is a shell-and-tube fixed bed reactor, a heat exchange medium interlayer is arranged on the outside of each shell and tube in the shell-and-tube fixed bed reactor. At this time, the specific surface area of ​​the reactor in each stage is much larger than the reactor, and the heat exchange is rapid, which can realize targeted and differentiated precise temperature control for the catalytic reactors of different stages, so that the temperature runaway phenomenon is not easy to occur during the reaction process of each stage, so that the reaction system has a high controllability as a whole. The gas-liquid mixed fluid forms a fixed retention time in the reaction tube of the shell-and-tube fixed bed reactor, and the reaction process is precisely controllable to seconds. When a shell-and-tube fixed bed reactor is selected, a heat exchanger is arranged on the periphery of the shell-and-tube fixed bed reactor, and the heat exchanger can transfer the heat of the mixed fluid at the outlet of the shell-and-tube fixed bed reactor to the mixed fluid at the inlet of the shell-and-tube fixed bed reactor. That is, a heat exchange device is added between the inlet and outlet pipes of the reaction mixed fluid, and the reaction outlet is used to heat the reaction inlet, which can effectively recover heat, reduce energy consumption, and help improve the temperature control accuracy of high temperature and high pressure areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall connection structure of an embodiment of the reaction device involved in this patent:

[0027] Figure 2 It is a schematic diagram of the series structure of the reaction system based on the reaction device scheme involved in this patent.

[0028] 1 reaction liquid storage tank, 2a pre-infusion pump, 2b booster infusion pump, 3 gas-liquid mixer, 4 gas-liquid mixed fluid storage, 5 catalytic reactor, 51 safety valve, 52 heat exchanger, 6 heat exchanger, 7 back pressure valve, 8 and 8.1, 8.2, ... 8.n gas-liquid separator DETAILED DESCRIPTION

[0029] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0030] like Figure 1 The gas-liquid catalytic reaction device shown comprises a reaction liquid storage tank 1, a catalytic reactor 5, a heat exchanger 6 and a back pressure valve 7. The reaction liquid storage tank 1 is provided with a reaction liquid input pipeline arranged at the top and an output pipeline arranged at the bottom. The heat exchanger 6 is arranged between the catalytic reactor 5 and the back pressure valve 7, and is used to cool the gas-liquid mixed fluid flowing out of the catalytic reactor 5. The back pressure valve 7 is connected to a liquid outlet pipeline, and is used to output the liquid after the reaction is completed. A stop valve is provided on the liquid outlet pipeline to control the conduction and closing of the liquid outlet pipeline.

[0031] Between the output pipeline of the reaction liquid storage tank 1 and the input pipeline of the catalytic reactor 5, an infusion pump 2a, 2b (i.e., an embedded infusion pump 2a and a booster infusion pump 2b) is respectively provided on the side close to the reaction liquid storage tank 1 and on the side close to the catalytic reactor 5, and a gas-liquid mixer 3 and a gas-liquid mixed fluid storage device 4 are provided between the infusion pumps 2a, 2b. The gas-liquid mixer 3 is connected to the gas transmission pipeline, and a flow regulating valve is generally provided on the gas transmission pipeline connected to the gas-liquid mixer 3 to regulate the gas flow rate sent into the gas-liquid mixer 3. If the pipeline between the gas-liquid mixed fluid storage device 4 and the booster infusion pump 2b is too long, an infusion pump (one or more stages) may be added in the middle. An infusion pump may also be added to the pipeline between the gas-liquid mixer 3 and the gas-liquid mixed fluid storage device 4.

[0032] Figure 1The scheme shown is an embodiment that can realize batch cyclic reaction. A gas-liquid separator 8 is arranged between the output port of the reaction liquid storage tank 1, the gas-liquid mixer 3 and the back pressure valve 7. At the same time, a pipeline (hereinafter referred to as "parallel pipeline") relatively parallel to the liquid outlet pipeline is also arranged at the output port of the back pressure valve. The parallel pipeline is connected to the top of the gas-liquid separator, and is used to transport the mixed fluid (in an unreacted state) flowing out of the back pressure valve to the gas-liquid separator 8. The parallel pipeline is also provided with a stop valve, which is generally opened and closed at one place with the stop valve arranged on the liquid outlet pipeline to ensure the continuous cyclic reaction of the batch. One end of the gas pipeline is connected to the gas-liquid mixer 3 after being connected by the gas-liquid separator 8. The gas-liquid separator 8 is connected to the gas pipeline and the reaction liquid storage tank 1, so that the separated liquid and gas are transported to the reaction liquid storage tank 1 and the gas-liquid mixer 3 respectively. The flow regulating valve provided on the connecting pipeline from the gas transmission pipeline to the gas-liquid mixer 3 and used for controlling the gas flow rate fed into the gas-liquid mixer 3 is installed on the connecting pipeline between the gas-liquid mixer 3 and the gas-liquid separator 8 .

[0033] The gas-liquid mixed fluid storage device 4 is connected to the gas-liquid separator 8 through a gas pipeline (called a reflux balance pipe). The gas-liquid separator 8 is connected to the middle of the gas pipeline and the reflux balance pipe is set, which can effectively recover the unreacted gas, ensure the stoichiometric utilization of the gas source gas, and avoid waste.

[0034] In the above implementation scheme, the reaction liquid storage tank 1, the gas-liquid mixer 3, the gas-liquid mixed fluid storage device 4 and other parts are kept at low pressure or normal pressure, and a high-pressure area is formed only in the section from the infusion pump to the back pressure valve near the catalytic reactor. Since the liquid holding capacity of this part of the high-pressure area is very small, the safety is extremely high. At the same time, in the pipeline, the temperature of the liquid or gas flowing through the non-high-pressure area is relatively low, which also helps to ensure the safety of the entire equipment during operation. The gas source is not required to be a high-pressure gas source.

[0035] In order to control the excessive pressure in the catalytic reactor 5 , a safety valve 51 is provided on the pipeline between the catalytic reactor 5 and the booster infusion pump 2 b , and a pressure relief pipe is connected to the safety valve 51 .

[0036] When the gas-liquid separator 8 and its pipeline connecting the reaction liquid storage tank 1, the gas-liquid mixer 3, the gas-liquid mixed fluid storage device 4 and the back pressure valve 7 are not provided, the reaction liquid can flow out through the liquid outlet pipe after flowing out of the back pressure valve and enter the reaction device of the next link, forming a part of the multi-stage continuous reaction device or a unit module (see the description of the catalytic reaction system below for details).

[0037] In a specific embodiment, the gas-liquid mixer 3 can be selected as a venturi (tubular) mixer, including a single venturi mixer used alone or multiple venturi mixers used simultaneously (forming a gas-liquid mixing system). In the case where multiple venturi mixers are used simultaneously, multiple venturi mixers can be in the form of being connected in series or in parallel, or even in the form of being mixed in series and in parallel. And when there are multiple venturi mixers, each venturi mixer is connected to the pipeline of the gas pipeline and a flow regulating valve is respectively set to accurately control the gas flow delivered to each venturi mixer and accurately control the gas-liquid ratio of each mixer. The gas-liquid mixer 3 also includes an embodiment of forming a gas-liquid mixing system including a venturi mixer and other types of mixers used in combination.

[0038] The infusion pumps 2a and 2b can be selected singly or simultaneously as magnetic centrifugal pumps, plunger pumps, diaphragm pumps, gear pumps, screw pumps, and other fluid delivery pumps that can be understood by engineers. The gas-liquid separator 8 can be a separator that can be understood and replaced by engineers, such as gravity sedimentation, baffles, centrifugation, packing separation, screen separation, microporous separation, and the like.

[0039] In a specific embodiment, the catalytic reactor 5 can be selected as a fixed bed reactor, such as an axial adiabatic fixed bed reactor, a radial adiabatic fixed bed reactor, or a tube-and-tube fixed bed reactor. The specific method is determined according to their characteristics and application scenarios.

[0040] There are three basic forms of fixed bed reactors: axial adiabatic fixed bed reactor, the fluid flows through the bed from top to bottom along the axial direction, and the bed has no heat exchange with the outside world. Radial adiabatic fixed bed reactor, the fluid flows through the bed along the radial direction, centrifugal flow or centripetal flow can be used, and the bed has no heat exchange with the outside world. Compared with the axial reactor, the radial reactor has a shorter fluid flow distance, a larger flow channel cross-sectional area, and a smaller fluid pressure drop (pressure drop is the energy loss of the airflow through the cyclone separator, which is another important indicator of the cyclone separator). However, the structure of the radial reactor is more complex than that of the axial reactor. The above two forms are adiabatic reactors, which are suitable for occasions where the reaction heat effect is not large, or the reaction system can withstand the temperature change caused by the reaction heat effect under adiabatic conditions. The shell and tube fixed bed reactor is composed of multiple reaction tubes in parallel. Catalysts are arranged in the tubes or between the tubes, and the heat carrier flows between the tubes or in the tubes for heating or cooling. The tube diameter is usually between 25 and 50 mm, and the number of tubes can be as many as tens of thousands. The shell and tube fixed bed reactor is suitable for reactions with large reaction heat effects. In addition, there are reactors composed of the above basic forms in series, which are called multi-stage fixed bed reactors. For example, when the reaction heat effect is large or the temperature needs to be controlled in stages, multiple adiabatic reactors can be connected in series to form a multi-stage adiabatic fixed bed reactor, and heat exchangers or supplementary materials are installed between the reactors to adjust the temperature so that the reactor can operate under conditions close to the optimal temperature.

[0041] The advantages of fixed bed reactors are:

[0042] ① Backmixing (backmixing, also known as reverse mixing, is a mixing phenomenon) is small, the fluid and the catalyst can be effectively contacted, and higher selectivity can be obtained when the reaction is accompanied by a series of side reactions.

[0043] ②The catalyst has low mechanical loss.

[0044] ③Simple structure.

[0045] The catalyst in the fixed bed reactor is not limited to granular catalysts. Net-shaped catalysts have long been used in industry. Currently, honeycomb and fiber-shaped catalysts have also been widely used.

[0046] like Figure 1 When a tube-type fixed bed reactor is selected, a heat exchange medium interlayer is arranged outside each tube, and the heat exchange medium inflow and outflow pipes are connected to the heat exchange medium interlayer to form a heat exchange circulation system. At this time, the specific surface area of ​​the reactor is much larger than that of the reactor, the heat exchange is rapid, the temperature control is accurate, and the phenomenon of temperature runaway (the reaction temperature loses control, rises sharply, and exceeds the allowable range) is not easy to occur during the reaction process, and it has high controllability. The gas-liquid mixed fluid forms a fixed retention time in the reaction tube of the tube-type fixed bed reactor, and the reaction process is precisely controllable to seconds. A heat exchanger 52 can be arranged on the periphery of the tube-type fixed bed reactor, and the heat exchanger 52 can transfer the heat of the mixed fluid at the outlet of the tube-type fixed bed reactor to the mixed fluid at the inlet of the tube-type fixed bed reactor, that is, a heat exchange device is added between the inlet and outlet of the reaction mixed fluid, and the reaction liquid is used to heat the reaction liquid, which can effectively recover heat, reduce energy consumption, and help improve the temperature control accuracy of the high temperature and high pressure zone. As shown in the figure, the portion of the inlet pipe of the reaction mixed fluid extending into the heat exchanger 52 is a multi-channel bending structure to ensure that a sufficient heat exchange area is formed.

[0047] like Figure 2 The gas-liquid catalytic reaction system shown includes a Figure 1 The main part of the device shown has several stages of catalytic reaction units (stage 1, stage 2 ... stage N), wherein a single-stage catalytic reaction unit includes:

[0048] The reaction liquid storage tank 1 is provided with a reaction liquid input pipeline and an output pipeline.

[0049] A catalytic reactor 5, a heat exchanger 6, and a back-pressure valve 7. The heat exchanger 6 is arranged between the catalytic reactor 5 and the back-pressure valve 7 and is used to cool the gas-liquid mixed fluid flowing out of the catalytic reactor 5. The back-pressure valve 7 is connected to a liquid outlet pipe.

[0050] Between the output pipeline of the reaction liquid storage tank 1 and the input pipeline of the catalytic reactor 5, an embedded infusion pump 2a and a booster infusion pump 2b are respectively provided on the side close to the reaction liquid storage tank 1 and on the side close to the catalytic reactor 5, and a gas-liquid mixer 3 and a gas-liquid mixed fluid storage device 4 are provided between the two infusion pumps 2a and 2b. The gas-liquid mixer 3 is directly connected to the gas transmission pipeline (on which a flow regulating valve is provided).

[0051] For each level of catalytic reaction units:

[0052] The reaction liquid input pipeline on the reaction liquid storage tank 1 provided in the first-stage catalytic reaction unit (stage 1) at the starting end is connected to the raw liquid source, and the gas pipelines in each stage of the catalytic reaction unit are all connected to the gas source. Gas-liquid separators 8.1, 8.2, ..., 8.n are respectively provided between the adjacent two-stage catalytic reaction units, which are used to connect the liquid outlet pipeline in the previous stage catalytic reaction unit, the reaction liquid input pipeline on the reaction liquid storage tank 1 in the next stage catalytic reaction unit, and the gas source pipeline.

[0053] For example, the liquid outlet pipeline in the first-stage catalytic reaction unit transports the mixed fluid that has completed the initial reaction to the gas-liquid separator 8.1 set between it and the second-stage catalytic reaction unit, and the separated reaction liquid is transported to the reaction liquid storage tank 1 in the second-stage catalytic reaction unit through the gas-liquid separator 8.1, and the separated gas enters the gas source pipeline to be supplied to the gas-liquid mixer 3 of the downstream catalytic reaction units at all levels. For example, the liquid outlet pipeline in the second-stage catalytic reaction unit transports the mixed fluid that has completed the second reaction to the gas-liquid separator 8.2 set between it and the third-stage catalytic reaction unit, and the separated reaction liquid is transported to the reaction liquid storage tank 1 in the third-stage catalytic reaction unit through the gas-liquid separator 8.2, and the separated gas enters the gas source pipeline to be supplied to the gas-liquid mixer 3 of the downstream catalytic reaction units at all levels. By analogy, the mixed fluid that has completed the final reaction is subjected to gas-liquid separation treatment by the gas-liquid separator 8.n set behind the Nth-stage catalytic reaction unit to obtain the corresponding liquid product and recover the unreacted gas.

[0054] exist Figure 2 In the catalytic reaction system shown, the gas-liquid mixer 3 involved in each stage of the catalytic reaction unit can be partially selected as a Venturi mixer (including the case of using a single mixer or a combination of multiple mixers). As described above with respect to the catalytic device, the gas-liquid mixer 3 includes a single mixer and a mixing system formed by multiple mixers (the multiple mixers can be of the same type or different types, and the combination relationship includes series connection, parallel connection, and a combination of series connection and parallel connection).

[0055] The infusion pumps 2a and 2b involved in each stage of the catalytic reaction unit can be selected singly or simultaneously as any fluid delivery pumps that can be understood by engineers, such as magnetic centrifugal pumps, plunger pumps, diaphragm pumps, gear pumps, screw pumps, etc. The gas-liquid separator 8 can be partially a separator that can be understood and replaced by any engineers, such as gravity sedimentation, baffles, centrifugation, packing separation, wire mesh separation, microporous separation, etc.

[0056] The catalytic reactor is Figure 1 In the tubular fixed bed reactor shown, a heat exchange medium interlayer is arranged outside each tubular in the tubular fixed bed reactor. A heat exchanger may also be arranged outside the tubular fixed bed reactor, and the heat exchanger can transfer the heat of the mixed fluid at the outlet of the tubular fixed bed reactor to the mixed fluid at the inlet of the tubular fixed bed reactor.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A gas-liquid catalytic reaction device, characterized in that include: A reaction liquid storage tank, on which a reaction liquid input pipeline and an output pipeline are provided; A catalytic reactor, a heat exchanger, and a back-pressure valve. The heat exchanger is disposed between the catalytic reactor and the back-pressure valve and is used to cool the gas-liquid mixed fluid flowing out of the catalytic reactor. The back-pressure valve is connected to a liquid outlet pipeline. The output pipeline of the reaction liquid storage tank is connected to the input pipeline of the catalytic reactor, and an infusion pump is provided at least at one end close to the reaction liquid storage tank and at one end close to the catalytic reactor, wherein the infusion pump close to the catalytic reactor is a booster infusion pump; a gas-liquid mixer and a gas-liquid mixed fluid storage device are provided between the infusion pumps at both ends; A safety valve is provided on the pipeline between the infusion pump close to the catalytic reactor and the catalytic reactor, and a pressure relief pipe is connected to the safety valve; It also includes a gas-liquid separator, which is connected to the gas pipeline and the reaction liquid storage tank, and the gas-liquid mixer is connected to the gas-liquid separator through a gas pipeline, and the gas-liquid mixed fluid storage device is connected to the gas-liquid separator through another gas pipeline; One port of the back pressure valve is provided with a pipeline connected in parallel with the liquid outlet pipeline and connected to the gas-liquid separator; and a stop valve is respectively provided on the liquid outlet pipeline and the pipeline connected in parallel therewith.

2. The gas-liquid catalytic reaction device according to claim 1, characterized in that: The gas-liquid mixer is a Venturi mixer.

3. The gas-liquid catalytic reaction device according to claim 1, characterized in that: The catalytic reactor is a fixed bed reactor.

4. The gas-liquid catalytic reaction device according to claim 1, characterized in that: The catalytic reactor is a tube-in-tube fixed bed reactor, and a heat exchange medium interlayer is arranged outside each tube in the tube-in-tube fixed bed reactor.

5. The gas-liquid catalytic reaction device according to claim 1, characterized in that: The catalytic reactor is a tube-in-tube fixed bed reactor, and a heat exchanger is provided on the periphery of the tube-in-tube fixed bed reactor; the heat exchanger can transfer the heat of the mixed fluid at the outlet of the tube-in-tube fixed bed reactor to the mixed fluid at the inlet of the tube-in-tube fixed bed reactor.

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