Nitrogen pulse equipment for producing ultraviolet light absorber UV-571

Abstract

The utility model relates to nitrogen pulse equipment for producing an ultraviolet light absorber UV-571, and belongs to the technical field of chemical refining equipment. The equipment comprises a crystallization kettle, a seed crystal incubator, a seed crystal pretreatment ball bladder, a seed crystal feeding device and nitrogen pulse equipment. The seed crystal incubator is welded on the side wall of the crystallization kettle, and is internally provided with a flowing hole channel comprising a bent hole channel; the seed crystal pretreatment ball bladder is communicated with the incubator through a material conveying pipe; and the nitrogen pulse equipment blows the seed crystal into the incubator in a pulse mode. According to the equipment, UV-P seed crystals are fed into an incubator in batches through pulse nitrogen and are mixed with a raw material solution with a slowed down flow rate, crystallization is induced, and generated stable crystals enter a crystallization kettle to promote overall crystallization. The problems that a traditional direct cooling method is poor in crystal form, small in precipitation amount and difficult to filter are effectively solved, and the purpose of improving production efficiency and product quality is achieved.

Description

Technical Field

[0001] This utility model relates to the field of chemical refining equipment technology, and in particular to a nitrogen pulse equipment for producing ultraviolet absorber UV-571. Background Technology

[0002] In today's era of pursuing green development, environmentally friendly coatings have become an indispensable part of building materials and industrial products. In this "green revolution," the sun generously provides light and heat to our planet. However, this generosity also hides a touch of "mischief"—ultraviolet (UV) radiation. While it provides energy for life, it is a veritable "destroyer" for many materials. From plastics to coatings, from textiles to electronic devices, long-term exposure to UV radiation can cause materials to age, discolor, and even degrade in performance. This is like a protracted war, and in this battle, the UV absorber UV-571 (hereinafter referred to as UV-571) becomes a "shield knight" for these materials.

[0003] UV-571 is a high-efficiency ultraviolet absorber specifically designed to protect various polymer materials from ultraviolet radiation. Its chemical name is 2-(2H-benzotriazole-2-yl-6-dodecyl-4-methylphenol, commonly known as dibenzotriazole compounds. This substance acts like an invisible sunscreen, effectively absorbing ultraviolet energy and converting it into harmless heat, thus preventing damage to the material's internal structure.

[0004] Plastic products occupy an important position in modern society due to their lightweight and economical characteristics. However, plastics are susceptible to the effects of ultraviolet (UV) radiation, leading to problems such as surface cracking and yellowing. UV-571, as a plastic additive, can significantly improve these problems. For example, adding UV-571 to PVC pipes used outdoors allows them to maintain good physical properties even after years of exposure to sun and rain.

[0005] Coatings are widely used in construction, automotive, and furniture industries, and the surfaces of these products are often directly exposed to sunlight. Without proper protection, the coating can quickly chalk or peel off. UV-571 plays a crucial role here, not only improving the coating's weather resistance but also ensuring its decorative effect remains unchanged over time.

[0006] In the field of outdoor sportswear, the application of UV-571 is particularly prominent. Experimental data shows that the treated fabric can achieve a UPF (ultraviolet protection factor) of 50+, which means that more than 98% of ultraviolet rays will be blocked, providing the wearer with all-round protection.

[0007] With increasing global focus on environmental protection, the environmental performance of UV-571 has garnered significant attention. This product complies with EU REACH regulations and is listed in the US FDA's list of approved food contact additives. This means it is not only safe for human health but also environmentally friendly.

[0008] The commonly used reaction method is to directly cool and crystallize the UV-571 reaction solution to precipitate UV-P raw material and remove unreacted UV-P. This method has the disadvantages of very low UV-P raw material crystallization, poor UV-P crystal morphology, and difficulty in filtration, leading to difficulties in the production process.

[0009] Therefore, how to form a stable UV-P crystal form, maintain a stable amount of crystallization precipitation, thereby reducing filtration time and producing higher quality UV-571, is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0010] The purpose of this invention is to address the shortcomings of existing technologies by proposing a nitrogen pulse device for producing ultraviolet absorber UV-571.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] The nitrogen pulse equipment for producing UV-571 ultraviolet absorber includes:

[0013] Crystallization vessel A;

[0014] Seed culture device E is welded to the side wall of crystallization vessel A. The inside of seed culture device E is provided with raw material liquid flow channel and is connected to crystallization vessel A. The front section of the flow channel is a curved channel.

[0015] The seed pretreatment bulb D is connected to the seed culturer E through the seed delivery pipe, and a mixing cavity is provided on the inner side of the seed pretreatment bulb D;

[0016] The seed crystal feeding device C is located on the outer wall of the seed crystal pretreatment sphere D and is used to feed UVP seed crystal particles.

[0017] Nitrogen pulse device B is installed at the top of seed crystal pretreatment sphere D and is used to provide nitrogen to seed crystal pretreatment sphere D.

[0018] In one possible design, the top of the crystallization vessel A is provided with a material inlet, an exhaust pipe, a nitrogen inlet, and an exhaust valve. A manhole cover is hinged to the top of the crystallization vessel A. A seed crystal conveying pipe is connected to the top of the crystallization vessel A. A steam pipe and a circulating water pipe are connected to the outer wall of the crystallization vessel A. A drainage pipe and a discharge pipe are connected to the bottom of the crystallization vessel A.

[0019] In one possible design, the top of the crystallization vessel A is rotatably connected to a rotating shaft, the bottom end of the rotating shaft extends into the crystallization vessel A and is fixed with stirring blades, and a motor is fixed at the top of the crystallization vessel A, with the output shaft of the motor and the rotating shaft being coaxially fixed.

[0020] In one possible design, the rear section of the flow channel is a crystal forming channel, and a seed feed plate is provided inside the flow channel.

[0021] In one possible design, the seed feeding device C is a UVP seed feeding port, which is fixedly connected to one side of the seed feeding device C.

[0022] In one possible design, the nitrogen pulse device B includes a pulse nitrogen outlet tank, the outlet of which is connected to the seed crystal feeding device C via a pipeline, and the inlet of which is connected to a nitrogen pipeline.

[0023] Beneficial effects:

[0024] By adding UV-P seed crystals to the seed feeding device, a nitrogen pulse device uses pulsed nitrogen to propel the pre-treated UV-P seed crystals into the seed culturer. Upon contact with the UV-P seed crystals, the flowing raw material begins to crystallize, and the seed crystals begin to grow. The grown crystals exit the seed culturer and contact the raw material in the crystallization vessel, aiding in the crystallization process. Through the seed culture equipment, the UV-P seed crystals are cultivated into stable crystals. These crystals then enter the raw material liquid in the crystallization vessel, causing more UV-P to precipitate, thus achieving the goal of removing UV-P from the raw material liquid. This process significantly promotes the crystallization process in the raw material liquid, ensuring the precipitation of stable UV-P crystals, reducing UV-P residue in the raw material liquid, and improving production efficiency.

[0025] The seed culture device has a raw material liquid flow channel inside. The front section of the flow channel is a curved channel. The purpose of the curved channel is to reduce the flow rate of the raw material liquid in order to better mix with the UV-P seed crystals.

[0026] The seed culture device has internal raw material flow channels, a central section of which is connected to a seed delivery pipe. The seed delivery pipe is connected to the flow channels, and a seed feed plate is located at the interface. The seed feed plate opens under nitrogen pressure, injecting nitrogen-mixed UV-P seeds into the flow channels. After the pulsed nitrogen flow ends, the raw material liquid in the flow channels closes the seed feed plate, thus shutting off the seed delivery pipe.

[0027] Nitrogen gas is injected into the seed crystal pretreatment bulb via pulses. This pulsed injection allows for the batch injection of UV-P seed crystals into the seed culture device, enabling staged seed cultivation.

[0028] By injecting nitrogen gas, the high-pressure nitrogen gas can purge the UV-P seed crystals, forming a mixed gas of nitrogen gas and UV-P seed crystals. The mixed gas is a mixture of nitrogen gas and UV-P seed crystal particles, and the UV-P seed crystal particles are dispersed in the nitrogen gas to prevent the UV-P seed crystals from agglomerating. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the process structure of the nitrogen pulse equipment for producing ultraviolet absorber UV-571 proposed in this utility model.

[0030] In the diagram: 1-1-1, Material inlet; 1-2, Exhaust pipe and nitrogen inlet; 1-3, Exhaust valve; 1-4, Motor; 1-5, Manhole cover; 1-6, Seed delivery pipe; 1-6-1, Steam pipe; 1-6-2, Circulating water pipe; 1-6-3, Drainage pipe; 1-7, Discharge pipe; 2-1, Nitrogen pipe; 2-2, Pulse nitrogen outlet tank; 2-3, UV-P seed inlet; 4-1, Flow channel; 4-1-1, Curved channel; 4-1-2, Crystal formation channel; 4-2, Seed feed plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] In one embodiment: Refer to Figure 1-Figure 1 The nitrogen pulse equipment includes: crystallization kettle A, seed culture device E, seed pretreatment bulb D, seed feeding device C, and nitrogen pulse equipment B.

[0033] Crystallization vessel A serves as the main reaction container, with a material inlet 1-1-1 at its top for feeding the completed UV-571 raw material solution. The top of crystallization vessel A also features a nitrogen inlet 1-2 and a vent valve 1-3, used to introduce a nitrogen protective atmosphere and release internal pressure, respectively. A manhole cover 1-5 is hinged to the top for easy maintenance. A seed crystal conveying pipe 1-6 connects at one end to the top of crystallization vessel A and at the other end to the seed crystal pretreatment spherical tube D, forming the seed crystal conveying path. The outer wall of crystallization vessel A is connected to a steam pipe 1-6-1 and a circulating water pipe 1-6-2, providing a heating source and cooling medium to control the internal temperature, respectively. Its bottom is connected to a condensate drain pipe 1-6-3 and a discharge pipe 1-7, used to discharge condensate and collect the final crystallized product, respectively.

[0034] The seed culture device E is fixed to the side wall of the crystallization vessel A by welding. It has a raw material liquid flow channel 4-1 inside, which is connected to the interior of the crystallization vessel A. The flow channel 4-1 is divided into two sections: the front section is a curved channel 4-1-1, whose special configuration is designed to reduce the flow rate of the raw material liquid and prolong its residence time, creating conditions for thorough mixing with the seed crystals; the rear section is a crystal formation channel 4-1-2, providing growth space for the seed crystals. Inside the flow channel 4-1, a seed crystal feed plate 4-2 is installed. This plate opens under nitrogen pressure, allowing the seed crystals to pass through, and closes under the pressure of the raw material liquid, acting as a one-way valve to effectively isolate the seed crystal delivery from the flow of the raw material liquid.

[0035] The seed pretreatment bulb D is connected to the seed culturer E via seed delivery pipes 1-6. It has an internal mixing cavity to accommodate and pretreat UV-P seed particles. A seed feeding device C is located on the outer wall of the seed pretreatment bulb D, specifically a UV-P seed feeding port 2-3, used to feed UV-P seed particles into the mixing cavity.

[0036] The nitrogen pulse device B is installed at the top of the seed crystal pretreatment sphere D and is a core functional component. It includes a pulse nitrogen outlet tank 2-2, whose outlet is connected to the seed crystal pretreatment sphere D via a pipe, and whose inlet is connected to the nitrogen pipe 2-1. This device can generate intermittent high-pressure nitrogen pulses.

[0037] This application can be used in the field of chemical refining equipment, or in other fields applicable to this application.

[0038] In another embodiment: a nitrogen pulse equipment for producing ultraviolet absorber UV-571, which is applied to the field of chemical refining equipment.

[0039] In another aspect of this embodiment, in order to enhance mass and heat transfer, a motor 1-4 is fixedly installed at the top of the crystallization vessel A. The output shaft of the motor 1-4 is coaxially fixed with a rotating shaft. The rotating shaft rotates through the top cover of the crystallization vessel A and extends into the interior. A stirring blade is fixedly installed at its bottom end. The rotation achieves uniform mixing and temperature distribution of the materials inside the vessel.

[0040] Each pipe, inlet, and outlet is equipped with a control valve.

[0041] Workflow:

[0042] S1. The UV-571 raw material solution after the reaction is completed is poured into crystallization kettle A, the stirrer is turned on, and the circulating water is turned on to cool it down.

[0043] S2. Add the UV-P seed crystals to the seed crystal feeding device. The nitrogen pulse device uses pulsed nitrogen to inject the UV-P seed crystals into the seed pretreatment bladder. High-pressure nitrogen then injects the UV-P seed crystals through the seed pretreatment bladder into the seed culturer.

[0044] S3. After the flowing raw material comes into contact with the UV-P seed crystals, crystallization begins.

[0045] S4. The grown crystal seed culture device, after contacting the raw material in the crystallization vessel, can help the raw material in the crystallization vessel to crystallize.

[0046] However, as is well known to those skilled in the art, the working principles and wiring methods of motor 1-4 and pulse nitrogen outlet tank 2-2 are conventional methods or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0047] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A nitrogen pulse equipment for producing ultraviolet absorber UV-571, characterized in that, include: Crystallization vessel A; Seed culture device E is welded to the side wall of crystallization vessel A. The inside of seed culture device E is provided with raw material liquid flow channel (4-1) and is connected to crystallization vessel A. The front section of flow channel (4-1) is a curved channel (4-1-1). The seed pretreatment bulb D is connected to the seed culturer E through the seed conveying pipe (1-6), and a mixing cavity is provided on the inner side of the seed pretreatment bulb D; The seed crystal feeding device C is located on the outer wall of the seed crystal pretreatment sphere D and is used to feed UV-P seed crystal particles. Nitrogen pulse device B is installed at the top of seed crystal pretreatment sphere D and is used to provide nitrogen to seed crystal pretreatment sphere D.

2. The nitrogen pulse equipment for producing ultraviolet absorber UV-571 according to claim 1, characterized in that, The top of the crystallization vessel A is provided with a material inlet (1-1-1), an vent pipe, a nitrogen inlet (1-2), and an vent valve (1-3). A manhole cover (1-5) is hinged to the top of the crystallization vessel A. A seed crystal conveying pipe (1-6) is connected to the top of the crystallization vessel A. A steam pipe (1-6-1) and a circulating water pipe (1-6-2) are connected to the outer wall of the crystallization vessel A. A drainage pipe (1-6-3) and a discharge pipe (1-7) are connected to the bottom of the crystallization vessel A.

3. The nitrogen pulse equipment for producing ultraviolet absorber UV-571 according to claim 2, characterized in that, The top of the crystallization vessel A is rotatably connected by a rotating shaft, the bottom of which extends into the crystallization vessel A and is fixed with stirring blades. The top of the crystallization vessel A is fixed with a motor (1-4), and the output shaft of the motor (1-4) is coaxially fixed with the rotating shaft.

4. The nitrogen pulse equipment for producing ultraviolet absorber UV-571 according to claim 3, characterized in that, The rear section of the flow channel (4-1) is a crystal forming channel (4-1-2), and a seed feed plate (4-2) is provided inside the flow channel (4-1).

5. The nitrogen pulse equipment for producing ultraviolet absorber UV-571 according to claim 4, characterized in that, The seed feeding device C is a UV-P seed feeding port (2-3), which is fixedly connected to one side of the seed feeding device C.

6. The nitrogen pulse equipment for producing ultraviolet absorber UV-571 according to claim 5, characterized in that, The nitrogen pulse device B includes a pulse nitrogen outlet tank (2-2), the outlet of which is connected to the seed crystal feeding device C via a pipeline, and the inlet of which is connected to the nitrogen pipeline (2-1).

Images