Separation and recovery device for olefin hydroformylation reaction liquid

Abstract

The utility model relates to the technical field of chemical production, in particular to a separation and recovery device for olefin hydroformylation reaction liquid, which comprises an evaporator and a cyclone separator, the evaporator is provided with an olefin hydroformylation reaction liquid inlet and a gas-liquid outlet, and the gas-liquid outlet of the evaporator is communicated with an input port of the cyclone separator. According to the separation and recovery device for the olefin hydroformylation reaction liquid, provided by the utility model, in the separation process of the reaction liquid, the structures of the synthesis gas input pipe and the cyclone separator are introduced, and the synthesis gas and a liquid-phase material flow which is output by the evaporator and contains a catalyst are simultaneously introduced into the cyclone separator; the internal structure of the cyclone separator is modified, so that the synthesis gas is in full contact with the rhodium catalyst, the rhodium catalyst is protected, the deactivation rate of the rhodium catalyst is reduced, most of the rhodium catalyst is recycled, and the loss of the rhodium catalyst is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a separation and recovery device for olefin hydroformylation reaction liquid. Background Art

[0002] Olefin hydroformylation converts olefins, hydrogen, and carbon monoxide into aldehydes. This reaction is of great significance in the chemical industry, as aldehydes can be further converted into high-value-added chemicals such as alcohols, acids, and esters, which are widely used in detergents, plasticizers, surfactants, pharmaceuticals, and fragrances. The olefin hydroformylation process can be summarized as follows: Under the action of a transition metal complex catalyst, a hydrogen and a formyl group are added to each end of the double bond of the olefin, forming an aldehyde with an additional carbon. This reaction is typically carried out in the presence of transition metals such as rhodium and iridium.

[0003] In the prior art, for the above-mentioned reaction, a kind of equipment and method is disclosed as patent CN107138182B, which has described the equipment and method of separating homogeneous catalyst from the feed stream comprising homogeneous catalyst and separation composition, and the separation composition can be separated therefrom by evaporation. The feed stream is supplied to the evaporation zone so that the evaporation separation composition is made. The evaporation zone is configured so that the feed stream has the first residence time in the evaporation zone. The separation composition of evaporation is then directly delivered to the vapor-liquid separator comprising a cooling device, wherein the liquid comprising the homogeneous catalyst is collected. The vapor-liquid separator allows a residence time of approximately 10 seconds to approximately 60 minutes. The volume of the liquid comprising the homogeneous catalyst is maintained at a level that the cooling device is substantially immersed in the liquid comprising the homogeneous catalyst. In the above reaction, the reaction liquid is a liquid containing butyraldehyde and a rhodium catalyst, and the rhodium catalyst is dissolved in a heavy component organic solvent; by heating the reaction liquid in an evaporator, the butyraldehyde is vaporized into a gas, and the butyraldehyde gas and the rhodium catalyst enter the gas-liquid separator together. The butyraldehyde gas is discharged from the top, and the cooled rhodium catalyst is discharged from the bottom and returned to the reactor. However, the rhodium catalyst will accelerate the deactivation rate when exposed to high temperature. A cooling pipe is provided in the gas-liquid separator to cool the rhodium catalyst, but this still causes the loss of the rhodium catalyst.

[0004] Furthermore, based on existing theoretical knowledge of metal complex catalysis, the active species of rhodium catalysts used in olefin hydroformylation reactions is a rhodium-hydrogen complex containing a ligand and carbon monoxide. This species is gradually destroyed and deactivated during the high-temperature evaporation process. In practice, additional rhodium catalyst is required to maintain normal operation of the equipment during industrial production.

[0005] Therefore, it can be seen that whether it is possible to provide a separation and recovery device for olefin hydroformylation reaction catalyst based on the deficiencies in the existing technology, which can achieve the protection and recovery of the rhodium catalyst and reduce the risk of loss and deactivation of the rhodium catalyst during the reaction process, has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] The utility model solves the problem of rhodium catalyst loss in the prior art by providing a separation and recovery device for olefin hydroformylation reaction liquid.

[0007] A separation and recovery device for olefin hydroformylation reaction liquid comprises an evaporator and a cyclone separator. The evaporator is provided with an olefin hydroformylation reaction liquid inlet and a gas-liquid outlet. The gas-liquid outlet of the evaporator is connected to the input port of the cyclone separator.

[0008] Furthermore, the input port of the cyclone separator is also connected to a synthesis gas input pipe.

[0009] Furthermore, the gas outlet of the cyclone separator is connected to a demister, and a cooling device is provided on the demister. The liquid outlet of the cyclone separator is connected to the inlet of the reactor, and the liquid outlet of the demister is connected to the inlet of the reactor.

[0010] Furthermore, the gas outlet of the defoamer is connected to a cooler and a gas-liquid separation tank in sequence. The synthesis gas outlet of the gas-liquid separation tank is connected to a compressor and a reactor in sequence.

[0011] Furthermore, a liquid guide groove is provided on the inner wall of the cone barrel of the cyclone separator, and a cooling pipe is provided on the outer wall of the cone barrel.

[0012] Furthermore, the liquid guide groove is arranged in a spiral shape along the inner wall of the cone barrel.

[0013] Furthermore, the cooling pipe is arranged on the upper part of the outer wall of the conical barrel and is spirally arranged along the outer wall of the conical barrel.

[0014] Furthermore, an overflow weir is provided on the inner wall of the inlet channel of the cyclone separator, and the overflow weir is arranged from high to low along the liquid flow direction, and a liquid outlet is provided on the overflow weir.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0016] 1. The utility model provides a separation and recovery device for olefin hydroformylation reaction liquid. In the separation process of the reaction liquid, a synthesis gas inlet pipe and a cyclone separator are introduced. The synthesis gas and the liquid phase stream containing the catalyst output from the evaporator are simultaneously introduced into the cyclone separator. By modifying the internal structure of the cyclone separator, the synthesis gas and the rhodium catalyst are fully contacted, which protects the rhodium catalyst, reduces the deactivation rate of the rhodium catalyst, and realizes the recovery and reuse of most of the rhodium catalyst. The recovery rate of the rhodium catalyst has been tested to reach 99.9998%, greatly reducing the loss of the rhodium catalyst.

[0017] 2. The utility model provides a separation and recovery device for olefin hydroformylation reaction liquid, which allows the reaction liquid to be combined with the synthesis gas to pass through a cyclone separator, a demister, a cooler and a gas-liquid separation tank in sequence, thereby avoiding the risk of deactivation of the rhodium catalyst due to high temperature, achieving high-quality recovery of the rhodium catalyst, and the synthesis gas introduced is recovered to the reactor for continued use, and the final separated aldehyde yield is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a separation and recovery device for olefin hydroformylation reaction liquid according to an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the cyclone separator structure of an embodiment of the present application.

[0020] Description of the drawings: 1. Evaporator; 2. Cyclone separator; 3. Defoamer; 4. Cooler; 5. Gas-liquid separation tank; 6. Liquid guide trough; 7. Overflow weir; 8. Cooling pipe. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be perfectly horizontal, but rather that it can be slightly tilted.

[0025] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] The following is a detailed description of some embodiments of the present invention in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] A separation and recovery device for olefin hydroformylation reaction liquid comprises an evaporator 1 and a cyclone separator 2. The evaporator 1 is provided with an olefin hydroformylation reaction liquid inlet and a gas-liquid outlet. The gas-liquid outlet of the evaporator 1 is connected to the input port of the cyclone separator 2, which is also connected to a synthesis gas input pipe. The gas outlet of the cyclone separator 2 is connected to a demister 3, which is provided with a cooling device. The liquid outlet of the cyclone separator 2 is connected to the inlet of the reactor, and the liquid outlet of the demister 3 is connected to the inlet of the reactor. The gas outlet of the demister 3 is connected in sequence to a cooler 4 and a gas-liquid separator 5. The synthesis gas outlet of the gas-liquid separator is connected in sequence to a compressor and a reactor.

[0029] Example 2:

[0030] A separation and recovery device for olefin hydroformylation reaction liquid, based on the structure described in Example 1, wherein the inner wall of the conical barrel of the cyclone separator is provided with a liquid guide groove 6, and the outer wall of the conical barrel is provided with a cooling pipe 8. The liquid guide groove 6 is arranged spirally along the inner wall of the conical barrel, and the cooling pipe 8 is arranged at the upper portion of the outer wall of the conical barrel and spirally along the outer wall of the conical barrel. An overflow weir 7 is provided on the inner wall of the inlet channel of the cyclone separator 2, and the overflow weir 7 is arranged from high to low along the direction of liquid flow, and the overflow weir 7 has a liquid outlet.

[0031] The implementation method of the olefin hydroformylation reaction liquid separation and recovery device of the above embodiment of the present invention includes the following steps:

[0032] Step 1: The reaction liquid obtained from the olefin hydroformylation unit is introduced into the evaporator 1 and heated to 60°C to 150°C;

[0033] Step 2: The gas and liquid flows flowing out of the evaporator 1 and the synthesis gas composed of hydrogen and carbon monoxide are transported together to the cyclone separator 2. An overflow weir 7 is provided on the inner wall of the inlet channel of the cyclone separator 2, and a liquid outlet is opened on the overflow weir 7. The liquid phase flow flows into the overflow weir 7 through the inlet channel and flows downward along the inner wall of the cone barrel through the liquid outlet. Under the action of the rotation of the cyclone separator 2, it is discharged from the bottom along the liquid guide groove 6. In the cyclone separator 2, the gas phase flow is separated into a liquid phase flow containing the catalyst under the cooling action of the cooling pipe 8 on the outer wall of the cyclone separator 2. The liquid phase flow is discharged from the bottom of the cyclone separator 2 along the liquid guide groove 6 and is recovered to the reactor for continued use. The gas phase flow is discharged from the top of the cyclone separator 2. The movement trajectory of the liquid phase flow containing the catalyst during the separation process is the same as the movement trajectory of the gas in the cyclone separator 2;

[0034] Step 3: The gaseous phase flow separated in step 2 is discharged from the top of the cyclone separator 2 and transported to the demister 3. The demister 3 is provided with a cooling device. The gas is separated by defoaming and cooling to obtain a gaseous phase flow and a liquid phase flow containing a trace catalyst; the gaseous phase flow includes aldehyde and synthesis gas, and the liquid phase flow containing a trace catalyst is recovered to the reactor for further use.

[0035] Step 4: The gaseous phase separated in step 3 is processed through a cooler 4 and a gas-liquid separation tank 5 to separate synthesis gas and aldehyde. The aldehyde may be one or more of butyraldehyde, valeraldehyde, hexanal, heptanal, octanal and nonanal. Those skilled in the art may make a selection based on production needs, and the selection does not require creative work.

[0036] The aldehyde prepared by the present invention is valeraldehyde. After testing, the recovery rate of the rhodium catalyst is 99.9998%. The detection instrument is graphite furnace atomic absorption spectrometry, general analysis A3, and the aldehyde yield is 99.0%.

[0037] The utility model provides a separation and recovery device for olefin hydroformylation reaction liquid. During the separation process of the reaction liquid, synthesis gas is introduced, and the synthesis gas and a liquid phase stream containing a catalyst are simultaneously passed into a cyclone separator 2. By modifying the internal structure of the cyclone separator 2, the synthesis gas is fully in contact with the rhodium catalyst, thereby protecting the rhodium catalyst, reducing the deactivation rate of the rhodium catalyst, and realizing the recovery and reuse of most of the rhodium catalyst. According to detection, the recovery rate of the rhodium catalyst reaches 99.9998% (detection instrument: graphite furnace atomic absorption spectrometry, general analysis A3), thereby greatly reducing the loss of the rhodium catalyst.

[0038] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0039] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A separation and recovery device for olefin hydroformylation reaction liquid, characterized in that: The invention comprises an evaporator and a cyclone separator. The evaporator is provided with an olefin hydroformylation reaction liquid inlet and a gas-liquid outlet. The gas-liquid outlet of the evaporator is connected to the input port of the cyclone separator. The input port of the cyclone separator is also connected to a synthesis gas input pipe.

2. The separation and recovery device for olefin hydroformylation reaction liquid according to claim 1, characterized in that: The gas outlet of the cyclone separator is connected to a demister, and a cooling device is provided on the demister.

3. The separation and recovery device for olefin hydroformylation reaction liquid according to claim 2, characterized in that: The gas outlet of the demister is sequentially connected to a cooler and a gas-liquid separation tank.

4. The separation and recovery device for olefin hydroformylation reaction liquid according to any one of claims 1 to 3, characterized in that: The inner wall of the cone barrel of the cyclone separator is provided with a liquid guide groove, and the outer wall of the cone barrel is provided with a cooling pipe.

5. The separation and recovery device for olefin hydroformylation reaction liquid according to claim 4, characterized in that: The liquid guide groove is spirally arranged along the inner wall of the cone barrel.

6. The separation and recovery device for olefin hydroformylation reaction liquid according to claim 4, characterized in that: The cooling pipe is arranged on the upper part of the outer wall of the cone barrel and is spirally arranged along the outer wall of the cone barrel.

7. The separation and recovery device for olefin hydroformylation reaction liquid according to any one of claims 1 to 3, characterized in that: An overflow weir is provided on the inner wall of the inlet channel of the cyclone separator. The overflow weir is arranged from high to low along the liquid flow direction, and a liquid outlet is opened on the overflow weir.

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