Multistage crystallization device for cyanuric chloride
By designing a multi-stage crystallization device, using multi-stage crystallization technology and dry air at different temperatures, the problems of low heat exchange efficiency and insufficient cooling capacity caused by large crystallizer volume are solved, which improves product yield and reduces sewage treatment costs.
Patent Information
- Application Number
- CN202421462899.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-25
AI Technical Summary
Due to the large volume of the crystallizer, the low heat exchange efficiency between molecules, and the insufficient cooling capacity required for Condensation, the crystallization path of gaseous cyanochloride increases. Some gaseous cyanochloride crystallizes in the exhaust system pipeline, affecting the normal production of the exhaust system and causing product consumption, seriously affecting product yield.
A multi-stage crystallization device of polycyanocyanide is designed, including four-stage, three-stage, two-stage and first-stage crystallizers. Through the communication pipe and dry air input pipe port, multi-stage crystallization technology and dry air of different temperatures are used to improve the heat exchange efficiency between molecules and reduce the crystallizer volume.
Through multi-stage crystallization technology, the cooling capacity required for material crystallization is reduced, the residence time of material in the crystallizer is increased, or eliminated material entering the exhaust system before crystallization is completed, product yield is improved, and sewage treatment costs are reduced.
Smart Images
Figure CN222788486U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical crystallization equipment, in particular to a cyanuric chloride multi-stage crystallization device. Background Art
[0002] In the production process of cyanuric chloride, its raw material cyanogen chloride is produced by the reaction of sodium cyanide and chlorine. Through ratio control, they enter the reactor together for reaction, and the reaction produces two phases, gas phase and liquid phase. After the gas phase cyanogen chloride is separated into gas and liquid by the separator, it is cooled and dehydrated by the cooler, enters the water mist collector to remove moisture again, and finally enters the dryer for dehydration. The removed wastewater enters the analytical kettle. Under indirect heating by steam, the cyanogen chloride monomer in the wastewater returns to the reaction system. The wastewater enters the wastewater tank, and the liquid level of the wastewater tank is controlled by an automatic valve, and it is transported to the reclaimed water workshop for treatment. The cyanogen chloride gas coming out of the dryer enters the polymerization furnace, where it is directly polymerized into cyanuric chloride gas under the catalytic action of activated carbon and then enters the crystallizer. Under the action of cold air, it is directly condensed into cyanuric chloride solid powder and enters the mixing tank. After adding silicon and stirring, it is directly fed with materials. The remaining small amount of gaseous cyanuric chloride enters the collector with the cold air for secondary crystallization. After being filtered by the filter air bag, the cyanuric chloride powder is directly retained in the collector. The remaining production waste gas enters the tail gas absorption system through the air duct for absorption, and is discharged to the atmosphere through the chimney after being treated as qualified. The gaseous cyanuric chloride meets the cold air in the crystallizer and condenses into cyanuric chloride powder. Due to the large volume of the crystallizer, the heat exchange efficiency between molecules is low, and the cold required for condensation is insufficient, resulting in an increase in the crystallization path of the gaseous cyanuric chloride. A part of the gaseous cyanuric chloride crystallizes in the tail gas system pipeline, which not only affects the normal production of the tail gas system, but also causes product consumption and seriously affects the product yield. Utility Model Content
[0003] The utility model aims to provide a cyanuric chloride multi-stage crystallization device to solve the problem that the gaseous cyanuric chloride meets cold air in a crystallization tank and condenses into cyanuric chloride powder, and the crystallizer has a large volume, low heat exchange efficiency between molecules, and insufficient cold required for condensation, which causes the crystallization path of the gaseous cyanuric chloride to increase, and a part of the gaseous cyanuric chloride crystallizes in the tail gas system pipeline, which not only affects the normal production of the tail gas system, but also causes product consumption and seriously affects the product yield.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a multi-stage crystallization device of cyanuric chloride, comprising a tail gas treatment tower, wherein the input end of the tail gas treatment tower is provided with a four-stage crystallizer, a three-stage crystallizer, a two-stage crystallizer and a one-stage crystallizer at one time, the one side of the one-stage crystallizer away from the two-stage crystallizer is connected with a material input pipe opening, the upper ends between the one-stage crystallizer and the two-stage crystallizer, the upper ends between the two-stage crystallizer and the three-stage crystallizer, and the upper ends between the three-stage crystallizer and the four-stage crystallizer are all connected with connecting pipes, the upper ends of the four-stage crystallizer, the three-stage crystallizer, the two-stage crystallizer and the one-stage crystallizer away from the tail gas treatment tower are all connected with a dry air input pipe opening, and a tail gas output pipe is provided between the four-stage crystallizer and the input end of the tail gas treatment tower.
[0005] Preferably, the lower ends of the fourth-stage crystallizer, the third-stage crystallizer, the second-stage crystallizer and the first-stage crystallizer are all connected to a discharge hopper, the lower ends of the discharge hoppers are all connected to a discharge pipe opening, and a partition is provided at the middle position of the upper inner end of the fourth-stage crystallizer, the third-stage crystallizer, the second-stage crystallizer and the first-stage crystallizer.
[0006] Preferably, dry air at 30° C. is input into the first-stage crystallizer and the second-stage crystallizer through the dry air input pipe; and dry air at -18° C. is input into the third-stage crystallizer and the fourth-stage crystallizer through the dry air input pipe.
[0007] Preferably, the output end of the four-stage crystallizer and the input end of the tail gas treatment tower are both provided with connecting flanges, and the tail gas output pipe is connected to the connecting flanges by bolts.
[0008] Preferably, the material input pipe opening, the connecting pipe and the tail gas output pipe are all arranged correspondingly.
[0009] Compared with the prior art, the beneficial effects of the utility model are: using the multi-stage crystallization technology of the utility model, the volume of the crystallizer is reduced, the heat exchange efficiency between molecules is increased, and compared with the traditional crystallization method, the cooling amount required for material crystallization is reduced, the residence time of the material in the crystallizer is increased, and the material is reduced or prevented from entering the exhaust system before the crystallization is completed, thereby improving the product yield and reducing the sewage treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is an axonometric drawing of the main structure of the utility model;
[0011] Figure 2 It is an axonometric cross-sectional view of the main structure of the utility model;
[0012] Figure 3This is a front cross-sectional view of the main structure of the utility model;
[0013] Figure 4 It is a schematic diagram of the main structure of the utility model;
[0014] Figure 5 It is a top view schematic diagram of the main structure of the utility model.
[0015] In the figure: 1- tail gas treatment tower, 2- four-stage crystallizer, 3- three-stage crystallizer, 4- two-stage crystallizer, 5- primary crystallizer, 6- material input pipe opening, 7- connecting pipe, 8- dry air input pipe opening, 9- tail gas output pipe, 10- discharge hopper, 11- discharge pipe opening, 12- partition, 13- connecting flange. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1-5 The utility model provides a multi-stage crystallization device of cyanuric chloride, comprising a tail gas treatment tower 1, wherein the input end of the tail gas treatment tower 1 is provided with a fourth-stage crystallizer 2, a third-stage crystallizer 3, a second-stage crystallizer 4 and a first-stage crystallizer 5 at one time, the first-stage crystallizer 5 is connected with a material input pipe opening 6 on a side away from the second-stage crystallizer 4, the upper ends between the first-stage crystallizer 5 and the second-stage crystallizer 4, the upper ends between the second-stage crystallizer 4 and the third-stage crystallizer 3, and the upper ends between the third-stage crystallizer 3 and the fourth-stage crystallizer 2 are all connected with a connecting pipe 7, the upper ends of the fourth-stage crystallizer 2, the third-stage crystallizer 3, the second-stage crystallizer 4 and the first-stage crystallizer 5 on a side away from the tail gas treatment tower 1 are all connected with a dry air input pipe opening 8, and a tail gas output pipe 9 is provided between the fourth-stage crystallizer 2 and the input end of the tail gas treatment tower 1.
[0018] When in use, gaseous cyanuric chloride is input into the interior of the primary crystallizer 5 through the material input nozzle 6, and 30°C dry air is input into the interior of the primary crystallizer 5 through the dry air input nozzle 8, and part of it is condensed into cyanuric chloride solid powder. The remaining uncondensed gaseous cyanuric chloride, with a temperature of about 120°C, is input into the interior of the secondary crystallizer 4 through the connecting pipe 7, and 30°C dry air is input into the interior of the secondary crystallizer 4 through the dry air input nozzle 8, and further condensed into cyanuric chloride solid powder with a temperature of about 80°C. A small amount of gaseous cyanuric chloride is input into the secondary crystallizer 4 through the connecting pipe 7. The exhaust gas generated during the production is input into the exhaust gas treatment tower 1 through the exhaust gas output pipe 9, and the exhaust gas is treated by the exhaust gas treatment tower 1.
[0019] The lower ends of the four-stage crystallizer 2, the three-stage crystallizer 3, the two-stage crystallizer 4 and the one-stage crystallizer 5 are all connected with a discharge hopper 10, and the lower ends of the discharge hopper 10 are all connected with a discharge pipe opening 11. A partition 12 is provided at the middle position of the upper end inside the four-stage crystallizer 2, the three-stage crystallizer 3, the two-stage crystallizer 4 and the one-stage crystallizer 5. The discharge hopper 10 is provided at the lower ends of the four-stage crystallizer 2, the three-stage crystallizer 3, the two-stage crystallizer 4 and the one-stage crystallizer 5 to collect the condensed solid cyanuric chloride in a unified and centralized manner and output it to the outside through the discharge pipe opening 11. The partition is provided inside the four-stage crystallizer 2, the three-stage crystallizer 3, the two-stage crystallizer 4 and the one-stage crystallizer 5 to slow down the flow of gaseous cyanuric chloride input into the four-stage crystallizer 2, the three-stage crystallizer 3, the two-stage crystallizer 4 and the one-stage crystallizer 5, thereby increasing the condensation effect of cyanuric chloride.
[0020] The dry air at 30°C is input into the first-stage crystallizer 5 and the second-stage crystallizer 4 through the dry air input pipe port 8; the dry air at -18°C is input into the third-stage crystallizer 3 and the fourth-stage crystallizer 2 through the dry air input pipe port 8, and the gaseous cyanuric chloride and the dry air at 30°C enter the first-stage crystallizer 5, partially condense into cyanuric chloride solid powder, and the remaining uncondensed gaseous cyanuric chloride has a temperature of about 120°C; it meets the dry air at 30°C again in the second-stage crystallizer 4, and further condenses into cyanuric chloride solid powder with a temperature of about 80°C; a small amount of gaseous cyanuric chloride and -18°C cold air condense into cyanuric chloride solid powder with a temperature of about 50°C in the third-stage crystallizer 3, and a trace amount of gaseous cyanuric chloride and -18°C cold air condense into cyanuric chloride solid powder with a temperature below 30°C in the fourth-stage crystallizer 2.
[0021] The output end of the four-stage crystallizer 2 and the input end of the tail gas treatment tower 1 are both provided with connecting flanges, and the tail gas output pipe 9 is connected to the connecting flange 13 by bolts, and the tail gas output pipe 9 is connected to the four-stage crystallizer 2 and the tail gas treatment tower 1 by the connecting flange 13.
[0022] The material input pipe opening 6, the connecting pipe 7 and the tail gas output pipe 9 are all correspondingly arranged, and the flow state of the gas cyanuric chloride between the fourth-stage crystallizer 2, the third-stage crystallizer 3, the second-stage crystallizer 4 and the first-stage crystallizer 5 is ensured to be consistent through the correspondingly arranged material input pipe opening 6, the connecting pipe 7 and the tail gas output pipe 9.
[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A multi-stage crystallization device for cyanuric chloride, characterized in that: The invention comprises a tail gas treatment tower (1), wherein the input end of the tail gas treatment tower (1) is provided with a fourth-stage crystallizer (2), a third-stage crystallizer (3), a second-stage crystallizer (4) and a first-stage crystallizer (5); the first-stage crystallizer (5) is connected to a material input pipe opening (6) at a side away from the second-stage crystallizer (4); the upper ends between the first-stage crystallizer (5) and the second-stage crystallizer (4), between the second-stage crystallizer (4) and the third-stage crystallizer (3), and between the third-stage crystallizer (3) and the fourth-stage crystallizer (2) are all connected to a connecting pipe (7); the upper ends of the fourth-stage crystallizer (2), the third-stage crystallizer (3), the second-stage crystallizer (4) and the first-stage crystallizer (5) at a side away from the tail gas treatment tower (1) are all connected to a drying air input pipe opening (8); and a tail gas output pipe (9) is provided between the fourth-stage crystallizer (2) and the input end of the tail gas treatment tower (1).
2. A cyanuric chloride multi-stage crystallization device according to claim 1, characterized in that: The lower ends of the four-stage crystallizer (2), the three-stage crystallizer (3), the two-stage crystallizer (4) and the one-stage crystallizer (5) are all connected to a discharge hopper (10), and the lower ends of the discharge hoppers (10) are all connected to a discharge pipe opening (11). A partition plate (12) is provided at the middle position of the upper end of the four-stage crystallizer (2), the three-stage crystallizer (3), the two-stage crystallizer (4) and the one-stage crystallizer (5).
3. A cyanuric chloride multi-stage crystallization device according to claim 1, characterized in that: Dry air at 30° C. is input into the first-stage crystallizer (5) and the second-stage crystallizer (4) through the dry air input pipe (8); and dry air at -18° C. is input into the third-stage crystallizer (3) and the fourth-stage crystallizer (2) through the dry air input pipe (8).
4. A cyanuric chloride multi-stage crystallization device according to claim 1, characterized in that: The output end of the four-stage crystallizer (2) and the input end of the tail gas treatment tower (1) are both provided with a connecting flange (13), and the tail gas output pipe (9) is connected to the connecting flange (13) by bolts.
5. A cyanuric chloride multi-stage crystallization device according to claim 1, characterized in that: The material input pipe opening (6), the connecting pipe (7) and the tail gas output pipe (9) are all arranged correspondingly.