Molecular sieve adsorption system
By designing a molecular sieve adsorption system for multi-deacid tanks, spraying devices and purge pipelines, the problems of low adsorption efficiency and unstable operation in the prior art are solved, and more efficient molecular sieve adsorption and regeneration are achieved.
Patent Information
- Application Number
- CN202420479639.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-12
AI Technical Summary
The adsorption efficiency of existing molecular sieve adsorption devices is low, the operating load is small and unstable.
A molecular sieve adsorption system is designed, including at least two deacidification tanks, a spray device and a purge pipe. The liquid sprayed through the spray device flows downward through the molecular sieve, and the purge pipe is injected into the purge for drying the molecular sieve. Gas improves the regeneration efficiency of molecular sieves.
It improves the adsorption efficiency of molecular sieves, enhances the system's fault resistance, and makes the operation safer and more stable.
Smart Images
Figure CN222434391U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of chemical technology, and more specifically, to a molecular sieve adsorption system. Background Art
[0002] Molecular sieve is a synthetic hydrated aluminosilicate (zeolite) or natural zeolite that has the function of screening molecules. It has many channels with uniform pore sizes and neatly arranged holes in its structure. Molecular sieves of different pore sizes separate molecules of different sizes and shapes. 2 and Al 2 O 3 The molecular ratio of the molecular sieve is different, and the molecular sieve with different pore sizes is obtained. Molecular sieve has high adsorption capacity, strong selectivity and high temperature resistance, and is widely used in the fields of organic chemical industry and petrochemical industry. The molecular sieve adsorption device of the prior art has low adsorption efficiency, small operating load and instability. Utility Model Content
[0003] In view of this, an embodiment of the present disclosure provides a molecular sieve adsorption system to solve the technical defects existing in the prior art.
[0004] To achieve the above objectives, the present disclosure adopts the following technical solutions:
[0005] The present disclosure provides a molecular sieve adsorption system, comprising:
[0006] At least two deacidification tanks, each of which has a molecular sieve disposed therein, and at least two of the deacidification tanks are configured to remove oxygen-containing compounds from the raw material;
[0007] A spray device, the spray device is arranged in the inner cavity of at least two of the deacidification tanks at a position above the molecular sieve, and the liquid sprayed from the spray device is configured to flow downward through the molecular sieve;
[0008] A purge pipeline is communicated with the deacidification tank and is configured to inject a purge gas for drying the molecular sieve into the deacidification tank through the purge pipeline.
[0009] In one embodiment of the present disclosure, when at least one deacidification tank is configured for deacidification, at least another deacidification tank is configured for regeneration.
[0010] In one embodiment of the present disclosure, the molecular sieve adsorption system further includes: a desalted water pipeline, the desalted water pipeline is connected to the spray device, and the desalted water pipeline is configured to provide desalted water to the spray device.
[0011] In one embodiment of the present disclosure, the purge gas is nitrogen.
[0012] In one embodiment of the present disclosure, the temperature of the purge gas is 130-140°C.
[0013] In one embodiment of the present disclosure, a discharge pipe is provided on the top of the deacidification tank, and the raw material is configured to be discharged from the discharge pipe after passing through the molecular sieve; the purge pipe is constructed to be connected to the discharge pipe, and when the deacidification tank is constructed for regeneration, the purge gas in the purge pipe is configured to enter the deacidification tank through the discharge pipe.
[0014] In one embodiment of the present disclosure, the molecular sieve adsorption system further includes a sewage pipe connected to the bottom of the deacidification tank, and the liquid after cleaning the molecular sieve is configured to be discharged through the sewage pipe.
[0015] In one embodiment of the present disclosure, a feed pipe is provided at the bottom of the deacidification tank, and the raw material is configured to enter the deacidification tank through the feed pipe; wherein the sewage pipe is connected to the feed pipe, and when the deacidification tank is constructed for regeneration, the liquid after cleaning the molecular sieve is configured to flow into the sewage pipe through the feed pipe.
[0016] In one embodiment of the present disclosure, the molecular sieve is a 13X molecular sieve.
[0017] In one embodiment of the present disclosure, the pressure of the purge gas is 0.07 MPa.
[0018] The present disclosure provides a molecular sieve adsorption system, which is provided with at least two deacidification tanks, so that the fault resistance of the entire system is greatly improved, and the operation process is safer and more stable. A spray device and a purge device are also provided, so that the molecular sieve can be efficiently regenerated and the adsorption efficiency is improved.
[0019] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic structural diagram of a molecular sieve adsorption system provided by an embodiment of the present disclosure;
[0021] Figure 2 It is a schematic structural diagram of a molecular sieve adsorption system provided in another embodiment of the present disclosure.
[0022] Reference numerals
[0023] 1-deacidification tank; 2-molecular sieve; 3-spraying device; 4-purge pipeline; 5-desalted water pipeline; 6-discharge pipeline; 7-drainage pipeline; 8-feed pipeline; 9-thermal desorbent pipeline; 10-purge gas recovery pipeline; 11-thermal desorbent recovery pipeline. DETAILED DESCRIPTION
[0024] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.
[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.
[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0027] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0028] The specific embodiments of the present disclosure are described below in conjunction with the accompanying drawings.
[0029] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.
[0030] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.
[0031] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.
[0032] The present disclosure provides a molecular sieve adsorption system, comprising at least two deacidification tanks, a spray device and a purge pipeline, wherein molecular sieves are arranged in at least two deacidification tanks, and at least two deacidification tanks are configured to remove oxygen-containing compounds in raw materials; the spray device is arranged in the inner cavity of the at least two deacidification tanks at a position above the molecular sieve, and the liquid sprayed from the spray device is configured to flow downward through the molecular sieve; the purge pipeline is connected to the deacidification tank, and is constructed to inject a purge gas for drying the molecular sieve into the deacidification tank through the purge pipeline.
[0033] The present disclosure provides a molecular sieve adsorption system, which is provided with at least two deacidification tanks, so that the fault resistance of the entire system is greatly improved, and the operation process is safer and more stable. A spray device and a purge device are also provided, so that the molecular sieve can be efficiently regenerated and the adsorption efficiency is improved.
[0034] For ease of understanding, refer to Figure 1 to Figure 2 , the specific structure and working principle of the molecular sieve adsorption system disclosed in the present invention are explained in detail with reference to an embodiment.
[0035] like Figure 1 As shown, the molecular sieve adsorption system in the present embodiment is composed of at least two deacidification tanks 1, a spray device 3 and a purge pipeline 4. The molecular sieve adsorption system in the present embodiment is mainly used to separate oxygenated compounds in Fischer-Tropsch feedstock oil, and the Fischer-Tropsch feedstock oil is a mixed component including a carbon number of 10-15 fractions. Considering that the system operation load is insufficient when the processing capacity is large, and when the deacidification tank 1 fails, it will cause the entire system to fail to operate normally, so it is necessary to be provided with at least two deacidification tanks 1, so that the fault resistance of the entire system is greatly improved, and the operation process is safer and more stable. Specifically, when at least one deacidification tank 1 is configured for deacidification, at least another deacidification tank 1 is configured for regeneration. Molecular sieves 2 are provided in at least two deacidification tanks 1, and at least two deacidification tanks 1 are configured to remove oxygenated compounds in the raw material.
[0036] A spray device 3 is also provided at the top of the deacidification tank 1. The spray device 3 is arranged in a position above the molecular sieve 2 in the inner cavity of at least two deacidification tanks 1. A plurality of nozzles are arranged on the spray device 3, and liquid is sprayed through the nozzles. The liquid sprayed from the spray device 3 is configured to flow downward through the molecular sieve 2, and the spray device 3 is configured to be used for cleaning the molecular sieve 2 and assisting the regeneration of the molecular sieve 2. The purge pipeline 4 is communicated with the deacidification tank 1, and is configured to inject a purge gas for drying the molecular sieve 2 into the deacidification tank 1 through the purge pipeline 4.
[0037] To make the adsorption operation cycle continue repeatedly, regeneration is an important part. To keep the molecular sieve 2 active and extend its service life, proper activation and regeneration methods are particularly important. Improper regeneration will not only affect the operation of the next cycle, but also waste energy. More importantly, it will damage the lattice of the molecular sieve 2 and affect its life.
[0038] like Figure 2 As shown, in one embodiment of the present disclosure, the molecular sieve adsorption system further includes a desalted water pipeline 5, and the provision of the desalted water pipeline 5 is also an important part of the regeneration process of the molecular sieve 2. In this embodiment, the desalted water pipeline 5 is connected to the spray device 3, and the desalted water pipeline 5 is configured to provide desalted water to the spray device 3.
[0039] Specifically, the desalted water pipeline 5 is connected to one end of the spray device 3 in at least two deacidification tanks 1 from the top, and a control valve is provided on the desalted water pipeline 5. The number of the control valves provided is the same as the number of the deacidification tanks 1, and each control valve is used to control the desalted water to enter the corresponding deacidification tank 1. When the molecular sieve 2 in a deacidification tank 1 is saturated with adsorption, the deacidification tank 1 stops working, and its corresponding control valve is opened. The desalted water enters the spray device 3 above the deacidification tank 1 through the desalted water pipeline 5, and is sprayed downward from the nozzle of the spray device 3, flows downward through the molecular sieve 2, and washes away the adsorbed substances on the surface of the molecular sieve 2, thereby assisting the regeneration of the molecular sieve 2. At this time, the other deacidification tank 1 is still in working state, and the control valve corresponding to the deacidification tank 1 is in a closed state.
[0040] Considering that the purge gas and its temperature and pressure are also important factors affecting the regeneration of the molecular sieve 2, therefore, in one embodiment of the present disclosure, the purge gas in the purge pipe 4 is nitrogen, and the temperature of the purge gas is 130-140°C, and the pressure of the purge gas is 0.07Mpa. Specifically, the nitrogen enters the deacidification tank 1 through the purge pipe 4. Since the temperature of the nitrogen is 130-140°C, the molecular sieve 2 can be dried, and the adsorbate on the molecular sieve 2 can be purged and desorbed to achieve the regeneration of the molecular sieve 2.
[0041] In one embodiment of the present disclosure, a discharge pipe 6 is provided at the top of the deacidification tank 1, and the raw material is configured to be discharged from the discharge pipe 6 after passing through the molecular sieve 2; the purge pipe 4 is constructed to be connected to the discharge pipe 6, and when the deacidification tank 1 is constructed for regeneration, the purge gas in the purge pipe 4 is configured to enter the deacidification tank 1 through the discharge pipe 6.
[0042] Specifically, the raw material is discharged from the discharge pipe 6 after oxygen-containing compounds are removed from the deacidification tank 1. A control valve is also provided on the purge pipe 4. The number of the control valves is the same as the number of the deacidification tanks 1. The control valve is used to control the purge gas to pass into the corresponding deacidification tank 1. When the molecular sieve 2 in the deacidification tank 1 is saturated with adsorption, the control valve is opened, and the purge gas enters the discharge pipe 6 through the purge pipe 4, and then enters the deacidification tank 1 through the discharge pipe 6 to purge and regenerate the molecular sieve 2.
[0043] like Figure 2 As shown, in one embodiment of the present disclosure, the molecular sieve adsorption system further includes a drain pipe 7 connected to the bottom of the deacidification tank 1, and the liquid after washing the molecular sieve 2 is configured to be discharged through the drain pipe 7. In addition, a feed pipe 8 is provided at the bottom of the deacidification tank 1, and the raw material is configured to enter the deacidification tank 1 through the feed pipe 8; wherein the drain pipe 7 is connected to the feed pipe 8, and when the deacidification tank 1 is configured for regeneration, the liquid after washing the molecular sieve 2 is configured to flow into the drain pipe 7 through the feed pipe 8.
[0044] Specifically, when the deacidification tank 1 stops the adsorption work and starts to regenerate the molecular sieve 2, the waste liquid generated by the regeneration of the molecular sieve 2 needs to be discharged through the sewage pipe 7. The sewage pipe 7 is provided with sewage valves, and the number of sewage valves is the same as the number of the deacidification tanks 1. When the deacidification tank 1 regenerates the molecular sieve 2, the sewage valve corresponding to the deacidification tank 1 is opened, and the waste liquid generated by the regeneration flows out from the feed pipe 8 of the deacidification tank 1, flows into the sewage pipe 7, and is discharged into the waste oil pipeline network for subsequent treatment.
[0045] In one embodiment of the present disclosure, the molecular sieve 2 is a 13X type molecular sieve, which has the advantages of uniform pore size and extremely high specific area, good thermal stability, strong adsorption, large internal surface area, high strength, etc., and can significantly improve the adsorption efficiency.
[0046] In order to obtain good operating performance and the longest possible life, the molecular sieve 2 needs to be fully and correctly regenerated. The molecular sieve 2 after correct regeneration is the same as the fresh one, and the attenuation and aging of its adsorption performance and mechanical properties are very low. Therefore, in one embodiment of the present disclosure, the molecular sieve adsorption system also includes a thermal desorbent pipeline 9. The thermal desorbent pipeline 9 is connected to the discharge pipeline 6 of the deacidification tank 1, and a control valve is arranged on the thermal desorbent pipeline 9. The number of control valves is the same as the number of deacidification tanks 1. When the adsorption force of the molecular sieve 2 in the deacidification tank 1 reaches saturation, the corresponding control valve is opened, and the thermal desorbent enters the discharge pipeline 6 of the deacidification tank 1 through the thermal desorbent pipeline 9, and then enters the deacidification tank 1 through the discharge pipeline 6. Under the action of the thermal desorbent, the adsorbate on the molecular sieve 2 is removed, so that the molecular sieve 2 can be fully regenerated.
[0047] In order to avoid waste of resources, in one embodiment of the present disclosure, the molecular sieve adsorption system is also provided with a purge gas recovery pipeline 10, and the purge gas recovery pipeline 10 is connected to the feed pipeline 8 of the deacidification tank 1. After the purge gas has fully purged the molecular sieve 2, the remaining purge gas enters the purge gas recovery pipeline 10 through the feed pipeline 8, and the purge gas is recovered, saving resources and costs.
[0048] As mentioned above, in order to further save resources and costs, in one embodiment of the present disclosure, the molecular sieve adsorption system is also provided with a thermal desorbent recovery pipeline 11, and the thermal desorbent recovery pipeline 11 is connected to the feed pipeline 8 of the deacidification tank 1. After the thermal desorbent has fully regenerated the molecular sieve 2, the remaining thermal desorbent enters the thermal desorbent recovery pipeline 11 through the feed pipeline 8, and the thermal desorbent is recovered to achieve the recycling of the thermal desorbent.
[0049] The present disclosure provides a molecular sieve adsorption system, which is provided with at least two deacidification tanks, so that the fault resistance of the entire system is greatly improved, and the operation process is safer and more stable. A spray device and a purge device are also provided, so that the molecular sieve can be efficiently regenerated and the adsorption efficiency is improved.
[0050] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present disclosure is not limited by the described action sequence, because according to the present disclosure, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present disclosure.
[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0052] The preferred embodiments of the present disclosure disclosed above are only used to help explain the present disclosure. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present disclosure. The present disclosure selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present disclosure, so that those skilled in the art can well understand and use the present disclosure. The present disclosure is limited only by the claims and their full scope and equivalents.
Claims
1. A molecular sieve adsorption system, characterized in that: include: At least two deacidification tanks (1), wherein molecular sieves (2) are arranged in the at least two deacidification tanks (1), and the at least two deacidification tanks (1) are configured to remove oxygen-containing compounds in the raw material; A spray device (3), the spray device (3) being arranged in the inner cavity of at least two of the deacidification tanks (1) at a position above the molecular sieve (2), and the liquid sprayed from the spray device (3) being configured to flow downward through the molecular sieve (2); A purge pipe (4), the purge pipe (4) is connected to the deacidification tank (1), and is configured to inject a purge gas for drying the molecular sieve (2) into the deacidification tank (1) through the purge pipe (4).
2. The molecular sieve adsorption system according to claim 1, characterized in that: When at least one deacidification tank (1) is configured for deacidification, at least another deacidification tank (1) is configured for regeneration.
3. The molecular sieve adsorption system according to claim 1, characterized in that: Also includes: A desalted water pipeline (5), the desalted water pipeline (5) is connected to the spray device (3), and the desalted water pipeline (5) is configured to provide desalted water to the spray device (3).
4. The molecular sieve adsorption system according to claim 1, characterized in that: The purge gas is nitrogen.
5. The molecular sieve adsorption system according to claim 1, characterized in that: The temperature of the purge gas is 130-140°C.
6. The molecular sieve adsorption system according to claim 1, characterized in that: A discharge pipe (6) is provided at the top of the deacidification tank (1), and the raw material is configured to be discharged from the discharge pipe (6) after passing through the molecular sieve (2); the purge pipe (4) is configured to be connected to the discharge pipe (6), and when the deacidification tank (1) is configured to be used for regeneration, the purge gas in the purge pipe (4) is configured to enter the deacidification tank (1) through the discharge pipe (6).
7. The molecular sieve adsorption system according to claim 1, characterized in that: It also includes a sewage pipe (7) connected to the bottom of the deacidification tank (1), and the liquid after washing the molecular sieve (2) is configured to be discharged through the sewage pipe (7).
8. The molecular sieve adsorption system according to claim 7, characterized in that: A feed pipe (8) is provided at the bottom of the deacidification tank (1), and the raw material is configured to enter the deacidification tank (1) through the feed pipe (8); wherein the sewage pipe (7) is connected to the feed pipe (8), and when the deacidification tank (1) is constructed so that when it is used for regeneration, the liquid after washing the molecular sieve (2) is configured to flow into the sewage pipe (7) through the feed pipe (8).
9. The molecular sieve adsorption system according to claim 1, characterized in that: The molecular sieve (2) is a 13X molecular sieve.
10. The molecular sieve adsorption system according to claim 1, characterized in that: The pressure of the purge gas is 0.07 MPa.