Catalyst feeding anti-blocking system
By adopting the side feed and reflux pipeline design between the catalyst buffer tank and the reactor in the production of high-carbon α-olefins by highly selective polymerization of ethylene, combined with an internal extension pipe, agitator and electric heating, the pipeline blockage problem caused by catalyst precipitation was solved, and stable operation and efficient production of the system were achieved.
Patent Information
- Application Number
- CN202422809242.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-18
AI Technical Summary
In the production process of high-carbon α-olefins by highly selective polymerization of ethylene, catalyst precipitation is prone to cause pipeline blockage, affecting reaction efficiency.
The side feed line and reflux line between the catalyst buffer tank and the reactor are used, combined with an inner extension pipe, a stirrer, electric heating and nitrogen disturbance to ensure the solubility and fluidity of the catalyst and prevent precipitation.
Effectively prevent catalyst precipitation in the pipeline, improve system stability and reaction efficiency, avoid blockage, and ensure catalyst activity.
Smart Images
Figure CN223366888U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical engineering, and particularly relates to a catalyst feed anti-blocking system. Background Art
[0002] The ethylene oligomerization process has become the main production method of α-olefins due to its high selectivity, yield and purity of the target product.
[0003] The key to highly selective ethylene oligomerization to high-carbon α-olefins lies in the industrialization of innovative catalyst systems. Zhejiang Petrochemical's 1,000 t / yr α-olefins plant project utilizes a new domestically produced chromium-based metallocene catalyst system for the first time. By examining the catalyst's activity, selectivity, and product separation characteristics, the project aims to address and overcome various typical challenges encountered in high-carbon α-olefin production.
[0004] However, in the actual production process of the 1,000-ton / year α-olefin unit, due to the poor solubility of the catalyst for ethylene tetramerization to produce 1-octene A and its easy precipitation at room temperature and low flow rate, there is a problem of pipeline blockage leading to reaction failure. Utility Model Content
[0005] The utility model aims at the above problems existing in the prior art and proposes a catalyst feed anti-blocking system.
[0006] The utility model can be realized by the following technical solutions:
[0007] A catalyst feed anti-clogging system, comprising:
[0008] Catalyst buffer tank;
[0009] The reactor is connected to the catalyst buffer tank via a side feed line and a reflux line, wherein:
[0010] An inner extension pipe is provided on the side of the catalyst buffer tank, and the inner extension pipe is used to introduce nitrogen into the catalyst buffer tank. The inner extension pipe is connected to the side feed pipeline, and the catalyst in the catalyst buffer tank flows into the reactor after passing through the inner extension pipe and the side feed pipeline in sequence;
[0011] When the reactor stops feeding, the catalyst in the catalyst buffer tank flows back into the catalyst buffer tank through the inner extension pipe, the side feed pipeline, and the reflux pipeline in sequence.
[0012] As a further improvement of the present invention, the catalyst buffer tank is further connected to a feed pipeline and a connecting pipeline. The catalyst enters the catalyst buffer tank through the feed pipeline, and the connecting pipeline is connected to an external configuration tank.
[0013] As a further improvement of the present invention, a stirrer is provided in the catalyst buffer tank, and the stirrer is driven by a motor and is used to stir the catalyst.
[0014] As a further improvement of the present invention, a nitrogen inlet is provided on the portion of the inner extension tube located outside the catalyst buffer tank, and nitrogen is introduced into the catalyst buffer tank through the nitrogen inlet.
[0015] As a further improvement of the present invention, a feed pump is provided on the side feed pipeline, and the catalyst in the side feed pipeline is pressurized and fed into the reactor through the feed pump.
[0016] As a further improvement of the present invention, a nitrogen pipeline is provided at the bottom of the catalyst buffer tank, and the nitrogen pipeline inputs nitrogen from the interior of the catalyst buffer tank.
[0017] As a further improvement of the present invention, a bottom feed pipeline is further provided at the bottom of the catalyst buffer tank, and the bottom feed pipeline is connected to the feed pump.
[0018] As a further improvement of the present invention, the bottom feed pipeline pressurizes the catalyst and feeds it into the reactor through the feed pump, or returns the catalyst to the catalyst buffer tank through the reflux pipeline.
[0019] As a further improvement of the present invention, electric heating is provided on both sides of the catalyst buffer tank and on any pipeline.
[0020] As a further improvement of the present invention, the temperature of the catalyst buffer tank and each pipeline is maintained at 40° C.-50° C. by the electric heating.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] 1. By setting up the inner extension pipe and the side feed pipeline, the original bottom feed of the catalyst buffer tank is changed to the side feed, thereby avoiding the catalyst deposited at the bottom of the catalyst buffer tank, and making the pipeline of the entire system less likely to be blocked;
[0023] 2. The dissolution of the catalyst is increased and the precipitation of the catalyst is reduced by mechanical stirring and electric heating, which has a better anti-clogging effect;
[0024] 3. Electric heating maintains the temperature of the catalyst buffer tank and each pipeline at 40℃-50℃, which can ensure the activity of the catalyst and reduce the precipitation of the catalyst;
[0025] 4. Considering that axial flow will be formed when the catalyst is stirred, the mouth of the inner extension pipe is set upward and located between the paddle and the tank wall, and a nitrogen port is opened on the part of the inner extension pipe located outside the catalyst buffer tank. Through the nitrogen port, ventilation disturbance is caused from the outside of the inner extension pipe into the system, so as to avoid catalyst precipitation in the dead zone outside the inner extension pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a system block diagram of the catalyst feed anti-clogging system of the utility model;
[0027] Figure 2 This is a schematic diagram of the location of the nitrogen port of the inner extension tube of the present invention.
[0028] In the figure, 100, catalyst buffer tank; 110, reactor; 120, side feed pipeline; 130, reflux pipeline; 140, inner extension pipe; 141, nitrogen port; 150, feed pipeline; 160, connecting pipeline; 170, configuration tank; 180, agitator; 181, motor; 190, electric heating; 200, feed pump; 210, nitrogen pipeline; 220, bottom feed pipeline. DETAILED DESCRIPTION
[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.
[0030] like Figure 1-2 As shown, the utility model provides a catalyst feed anti-clogging system, comprising:
[0031] Catalyst buffer tank 100;
[0032] The reactor 110 is connected to the catalyst buffer tank 100 via a side feed line 120 and a reflux line 130.
[0033] An inner extension pipe 140 is provided on the side of the catalyst buffer tank 100. The inner extension pipe 140 is used to introduce nitrogen into the catalyst buffer tank 100. The inner extension pipe 140 is connected to the side feed line 120. The catalyst in the catalyst buffer tank 100 flows into the reactor 110 after passing through the inner extension pipe 140 and the side feed line 120 in sequence.
[0034] When the reactor 110 stops feeding, the catalyst in the catalyst buffer tank 100 flows back into the catalyst buffer tank 100 through the inner extension pipe 140 , the side feed pipeline 120 , and the reflux pipeline 130 in sequence.
[0035] By setting up the inner extension pipe 140 and the side feed pipeline 120, the original bottom feed of the catalyst buffer tank 100 is changed to side feed, thereby avoiding the catalyst precipitated at the bottom of the catalyst buffer tank 100, and making it less likely for the pipeline of the entire system to be blocked.
[0036] In addition, nitrogen is introduced into the catalyst buffer tank 100 through the inner extension tube 140 to disturb the fluid at the bottom of the tank, thereby avoiding the formation of catalyst precipitation in the dead zone outside the inner extension tube 140. It can also prevent the catalyst from forming a dead zone at the bottom of the tank, reduce the precipitation of the catalyst, and further play an anti-clogging role.
[0037] The provision of the reflux line 130 can maintain the fluidity of the catalyst even after the reactor 110 stops feeding, prevent the catalyst from settling and clogging in the line, and improve the stability and reliability of the system.
[0038] Preferably, the catalyst buffer tank 100 is also connected to a feed pipeline 150 and a connecting pipeline 160. The catalyst enters the catalyst buffer tank 100 through the feed pipeline 150. The connecting pipeline 160 is connected to an external configuration tank 170. The configuration pipe is used to mix catalyst A with methylcyclohexane to form a catalyst solution and transport it to the catalyst buffer tank 100.
[0039] Preferably, a stirrer 180 is provided in the catalyst buffer tank 100, and the stirrer 180 is driven by a motor 181 and is used to stir the catalyst. The stirrer 180 is used to stir the catalyst solution to reduce catalyst precipitation;
[0040] Among them, considering that the catalyst will form axial flow when it is stirred (the fluid is pushed downward by the paddle, and turns upward to form an up and down circulating flow after encountering the bottom of the container), the pipe mouth of the inner extension pipe 140 is set upward and located between the paddle and the tank wall, and the part of the inner extension pipe 140 located outside the catalyst buffer tank 100 is provided with a nitrogen port 141, and the nitrogen port 141 is used to ventilate the system from the outside of the inner extension pipe 140 to avoid catalyst precipitation in the dead zone outside the inner extension pipe 140.
[0041] Preferably, electric heating 190 is provided on both sides of the catalyst buffer tank 100 and on any pipeline. The temperature of the catalyst buffer tank 100 and each pipeline is maintained at 40°C-50°C by the electric heating 190. This temperature can ensure the activity of the catalyst and reduce the precipitation of the catalyst.
[0042] That is to say, in addition to side feeding and nitrogen disturbance, mechanical stirring and electric heating 190 are used to increase the dissolution of the catalyst and reduce the precipitation of the catalyst, thereby better preventing blockage.
[0043] Preferably, a feed pump 200 is provided on the side feed pipeline 120 , and the catalyst in the side feed pipeline 120 is pressurized and fed into the reactor 110 via the feed pump 200 .
[0044] Preferably, a nitrogen pipeline 210 is provided at the bottom of the catalyst buffer tank 100, and the nitrogen pipeline 210 inputs nitrogen from the inside of the catalyst buffer tank 100. Similarly, adding a nitrogen pipeline 210 to introduce a small amount of nitrogen from the bottom of the catalyst buffer tank 100 can disturb the catalyst precipitated at the bottom of the tank and reduce the precipitation of the catalyst.
[0045] Preferably, a bottom feed pipeline 220 is also provided at the bottom of the catalyst buffer tank 100, and the bottom feed pipeline 220 is connected to the feed pump 200. The bottom feed pipeline 220 pressurizes the catalyst into the reactor 110 through the feed pump 200, or returns the catalyst to the catalyst buffer tank 100 through the reflux pipeline 130.
[0046] It should be noted that the provision of the bottom feed line 220 provides an alternative solution. If the side feed line 120 is blocked or has other problems, the catalyst can be transported to the reactor 110 through the bottom feed line 220 to ensure the stability of the system.
[0047] The technical means disclosed in the present invention are not limited to those disclosed in the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.
[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0049] In addition, in the present invention, descriptions such as "," "," and "one" are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined with "," "" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0050] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0051] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
Claims
1. A catalyst feed anti-blocking system, characterized in that: include: Catalyst buffer tank; The reactor is connected to the catalyst buffer tank via a side feed line and a reflux line, wherein: An inner extension pipe is provided on the side of the catalyst buffer tank, and the inner extension pipe is used to introduce nitrogen into the catalyst buffer tank. The inner extension pipe is connected to the side feed pipeline, and the catalyst in the catalyst buffer tank flows into the reactor after passing through the inner extension pipe and the side feed pipeline in sequence; When the reactor stops feeding, the catalyst in the catalyst buffer tank flows back into the catalyst buffer tank through the inner extension pipe, the side feed pipeline, and the reflux pipeline in sequence.
2. A catalyst feed anti-clogging system according to claim 1, characterized in that: The catalyst buffer tank is also connected to a feed pipeline and a communication pipeline. The catalyst enters the catalyst buffer tank through the feed pipeline. The communication pipeline is connected to an external configuration tank.
3. A catalyst feed anti-clogging system according to claim 1, characterized in that: The catalyst buffer tank is provided with an agitator, which is driven by a motor and is used to stir the catalyst.
4. A catalyst feed anti-clogging system according to claim 1, characterized in that: A nitrogen inlet is provided on the portion of the inner extension tube located outside the catalyst buffer tank, and nitrogen is introduced into the catalyst buffer tank through the nitrogen inlet.
5. A catalyst feed anti-clogging system according to claim 1, characterized in that: A feed pump is provided on the side feed pipeline, and the catalyst in the side feed pipeline is pressurized and fed into the reactor through the feed pump.
6. A catalyst feed anti-clogging system according to claim 1, characterized in that: A nitrogen pipeline is provided at the bottom of the catalyst buffer tank, and the nitrogen pipeline inputs nitrogen from the interior of the catalyst buffer tank.
7. A catalyst feed anti-clogging system according to claim 5, characterized in that: A bottom feed pipeline is also provided at the bottom of the catalyst buffer tank, and the bottom feed pipeline is connected to the feed pump.
8. A catalyst feed anti-clogging system according to claim 7, characterized in that: The bottom feed line is used to pressurize the catalyst and feed it into the reactor through the feed pump, or to return the catalyst to the catalyst buffer tank through the reflux line.
9. The catalyst feed anti-clogging system according to claim 1, characterized in that: Electric heating is provided on both sides of the catalyst buffer tank and on any pipeline.
10. A catalyst feed anti-clogging system according to claim 9, characterized in that: The temperature of the catalyst buffer tank and each pipeline is maintained at 40° C.-50° C. by the electric heating.