Efficient feeding jet mixer for long-chain alkylbenzene production

Abstract

The utility model discloses an efficient feed jet mixer for long-chain alkylbenzene production, which comprises a mixing chamber and a liquid storage chamber, the mixing chamber is provided with a first feed inlet and a second feed inlet, the liquid storage chamber is provided with a hydrogen fluoride feed inlet, the mixing chamber is connected with the liquid storage chamber, the joint of the liquid storage chamber and the mixing chamber is provided with a feed jet mixer, and the feed jet mixer is connected with the liquid storage chamber. The feeding jet mixer comprises a high-pressure inlet and a jet head, and a liquid jet outlet of the jet head is located in the mixing chamber. Through the arrangement of the feeding jet mixer, hydrogen fluoride is changed into a low-pressure liquid phase from a high-pressure liquid phase, the contact area between the hydrogen fluoride and a benzene and olefin mixture is increased, mixing is more sufficient, and then the reaction is more complete; the generated alkyl benzene bromine index is reduced, and the sulfonation effect is better.

Description

Technical Field

[0001] The utility model belongs to the field of chemical production equipment, and in particular relates to a high-efficiency feed jet mixer for the production of long-chain alkylbenzene. Background Art

[0002] Long-chain alkylbenzenes are important organic chemical products. Their production involves a mixing reaction between benzene and long-chain olefins. Conventional mixing equipment suffers from shortcomings in mixing efficiency and uniformity, leading to incomplete reactions and unstable product quality. This is particularly true when using hydrogen fluoride as a catalyst. Inhomogeneous mixing can result in a high bromine index in the product, leading to unsatisfactory subsequent sulfonation. Therefore, a feed mixing device is needed that can improve mixing efficiency and ensure a complete reaction. Summary of the Invention

[0003] To solve the above problems, the purpose of the present invention is to provide a high-efficiency feed jet mixer for the production of long-chain alkylbenzenes. By optimizing the structural design of the mixer, the mixing efficiency of the mixture of hydrogen fluoride, benzene and long-chain olefins is significantly improved, ensuring a more complete reaction and thus improving product quality.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0005] A fixed-bed alkane dehydrogenation reactor comprises a mixing chamber and a liquid storage chamber. The mixing chamber is provided with a first feed port and a second feed port. The liquid storage chamber is provided with a hydrogen fluoride feed port. The mixing chamber is connected to the liquid storage chamber. A feed injection mixer is provided at the connection between the liquid storage chamber and the mixing chamber. The feed injection mixer comprises a high-pressure inlet and an injection head. The liquid injection outlet of the injection head is located in the mixing chamber.

[0006] As an improvement of the present invention, the injection head is trumpet-shaped and has a trumpet mouth, so as to increase the contact area between hydrogen fluoride and the mixture.

[0007] As an improvement of the present invention, the number of the bell mouths is 4.

[0008] As an improvement of the present invention, a circulation pump is provided in the liquid storage chamber, and a flow meter is provided at the center of the high-pressure inlet.

[0009] As an improvement of the present invention, the mixing chamber is L-shaped and a stirring shaft is provided in the mixing chamber.

[0010] The beneficial effects of the utility model are:

[0011] The bell-mouth design of the spray head significantly increases the contact area and mixing efficiency between the hydrogen fluoride and the mixture, ensuring a more complete reaction. The circulating pump within the liquid storage chamber and the flowmeter at the high-pressure inlet enable precise control of liquid flow, improving the stability of the equipment's operation. The L-shaped mixing chamber, combined with the agitator shaft, ensures more complete mixing of materials within the mixing chamber, further enhancing reaction efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of a fixed-bed alkane dehydrogenation reactor.

[0013] Figure 2 A cross-sectional view of the injection head.

[0014] List of Figure Symbols:

[0015] 1. Mixing chamber; 2. Liquid storage chamber; 3. First feed port; 4. Second feed port; 5. Hydrogen fluoride feed port; 6. Feed jet mixer; 61. High-pressure inlet; 62. Injection head; 63. Bell mouth; 7. Circulation pump; 8. Stirring shaft; 9. Discharge port. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0017] Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model in their respective contexts.

[0018] Example 1

[0019] A high-efficiency feed jet mixer 6 for the production of long-chain alkylbenzene comprises a mixing chamber 1 and a liquid storage chamber 2. The mixing chamber 1 is provided with a first feed port 3 and a second feed port 4, which are used to introduce benzene and long-chain olefins, respectively. The liquid storage chamber 2 is provided with a hydrogen fluoride feed port 5. Hydrogen fluoride enters the liquid storage chamber 2 through a high-pressure inlet 61 and is pushed into the feed jet mixer 6 by a circulation pump 7. An injection head 62 is located at the connection between the liquid storage chamber 2 and the mixing chamber 1. The injection head 62 is trumpet-shaped and is provided with four trumpet ports 63. The liquid injection outlet extends into the mixing chamber 1. Hydrogen fluoride is injected into the mixing chamber 1 through the injection head 62 under high pressure and is fully mixed with the benzene and long-chain olefin mixture entering from the first and second feed ports 4.

[0020] Example 2

[0021] The structure is further optimized based on Example 1. The mixing chamber 1 is designed to be L-shaped and is provided with a stirring shaft 8. The stirring shaft 8 is driven to rotate by a motor, so that the material forms a strong vortex effect in the L-shaped mixing chamber 1, further enhancing the mixing effect.

[0022] The working principle and use process of this utility model:

[0023] Hydrogen fluoride first enters the liquid storage chamber 2 through the hydrogen fluoride feed port 5. A circulation pump 7 is installed within the liquid storage chamber 2 to maintain continuous circulation of the hydrogen fluoride liquid and ensure a uniform flow within the liquid storage chamber 2. Driven by the circulation pump 7, the hydrogen fluoride enters the feed jet mixer 6 through a high-pressure inlet 61 connected to the liquid storage chamber 2. A flow meter is also located at the center of the high-pressure inlet 61, which monitors and controls the hydrogen fluoride feed flow in real time to ensure that the amount of hydrogen fluoride entering the injector meets design requirements and avoids over- or under-feeding.

[0024] Hydrogen fluoride liquid is injected under high pressure through the injector's nozzle 62. The nozzle 62 is trumpet-shaped and features four bell-shaped openings 63. This design efficiently converts the hydrogen fluoride into a high-speed liquid jet. When hydrogen fluoride enters the mixing chamber 1 through the nozzle 62, the high-speed flow of the liquid creates a localized negative pressure region within the mixing chamber 1 downstream of the nozzle 62. This negative pressure region is achieved through Bernoulli's principle: the high-speed flow of the liquid causes a drop in surrounding pressure, creating suction within the mixing chamber 1.

[0025] Mixing chamber 1 is equipped with a first feed port 3 and a second feed port 4, respectively, for introducing the benzene and long-chain olefins required for long-chain alkylbenzene production. Due to the local negative pressure within mixing chamber 1, these materials are rapidly drawn into the high-speed jet of hydrogen fluoride. During the jetting process, a strong turbulent effect is generated between the hydrogen fluoride and the benzene / long-chain olefin mixture. This turbulent effect increases the contact area between the materials, enabling initial mixing of the hydrogen fluoride, benzene, and long-chain olefins in a very short time.

[0026] The mixed materials continue to flow within mixing chamber 1. To further enhance mixing uniformity, mixing chamber 1 is designed with an L-shaped structure and is equipped with a stirring shaft 8. This stirring shaft 8, driven by a motor, rotates, creating a complex vortex motion within the L-shaped mixing chamber 1. This vortex motion ensures more thorough mixing of the materials within mixing chamber 1. The action of stirring shaft 8 further homogenizes the mixture of hydrogen fluoride, benzene, and long-chain olefins within mixing chamber 1, ensuring that all materials are thoroughly mixed before exiting mixing chamber 1 and entering the reactor.

[0027] Finally, the fully mixed material flows out of the discharge port 9 from the feed injection mixer 6, passes through the external pipeline and is sent to the reactor for reaction to produce long-chain alkylbenzene, and then passes through the hydrogen fluoride distillation tower and the debenzenization tower to remove hydrogen fluoride and benzene, producing qualified long-chain alkylbenzene.

[0028] Through the above design, the high-efficiency feed jet mixer of this utility model can significantly improve the mixing efficiency of hydrogen fluoride, benzene, and long-chain olefins, ensuring that the materials are fully mixed before entering the reactor, providing a strong guarantee for the production of high-quality long-chain alkylbenzenes. This structural design not only optimizes the production process, but also effectively improves product quality and production efficiency.

[0029] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made on the basis of the above embodiments, and these improvements and modifications all fall within the scope of protection of the claims of the present invention.

Claims

1. A high-efficiency feed jet mixer for long-chain alkylbenzene production, comprising a mixing chamber and a liquid storage chamber, wherein the mixing chamber is provided with a first feed inlet and a second feed inlet, the liquid storage chamber is provided with a hydrogen fluoride feed inlet, and the mixing chamber is connected to the liquid storage chamber, characterized in that: A feed injection mixer is provided at the connection between the liquid storage chamber and the mixing chamber. The feed injection mixer comprises a high-pressure inlet and an injection head. The liquid injection outlet of the injection head is located in the mixing chamber.

2. The high-efficiency feed jet mixer for long-chain alkylbenzene production according to claim 1, characterized in that: The injection head is in a trumpet shape, and a trumpet mouth is provided on the injection head.

3. A high-efficiency feed jet mixer for long-chain alkylbenzene production according to claim 2, characterized in that: The number of the bell mouths is 4.

4. The high-efficiency feed jet mixer for long-chain alkylbenzene production according to claim 1, characterized in that: A circulation pump is provided in the liquid storage chamber, and a flow meter is provided at the center of the high-pressure inlet.

5. The high-efficiency feed jet mixer for long-chain alkylbenzene production according to claim 4, characterized in that: The mixing chamber is L-shaped and a stirring shaft is provided in the mixing chamber.

Images