Hydrogen chloride gas phosphorus washing device for cartap production
By introducing the spray mechanism and condenser of the hydrolysis kettle and phosphorus washing tower in the production of cartap, the problem of accumulation of unreacted products in hydrogen chloride gas was solved, safety and cost-effectiveness were improved, and product quality was ensured.
Patent Information
- Application Number
- CN202422764588.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-13
AI Technical Summary
During the production of cartap, the hydrogen chloride gas contains incompletely reacted phosphorus trichloride and phosphorus components, which leads to safety hazards, high production costs, reduced product quality, and the need for additional refrigeration equipment, which increases energy consumption.
A hydrolysis kettle and a phosphorus washing mechanism are used. The hydrochloric acid solution is sprayed onto the packing in the phosphorus washing tower through a spray mechanism to wash the hydrogen chloride gas. The condenser is used to lower the temperature of the hydrochloric acid, improve the phosphorus absorption rate, avoid phosphorus accumulation on the inner wall of the pipeline, and reduce the amount of phosphorus trichloride and equipment investment.
The safety hazard is eliminated, production efficiency and product quality are improved, production cost and energy consumption are reduced, and the complete reaction of phosphorus trichloride is achieved.
Smart Images
Figure CN223381363U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a phosphorus removal device, specifically a device used to remove phosphorus and unreacted phosphorus trichloride in hydrogen chloride gas during the production process of cartap (a pesticide for killing stem borers). Background Art
[0002] It's well known in the field of cartap (a pesticide used to kill stem borers) production that hydrogen chloride gas is required during the synthesis phase. The traditional method for obtaining this gas involves first filling a jacketed glass-lined kettle equipped with a stirring mechanism with hydrochloric acid at a volume that fills two-thirds of the kettle's volume. Liquid phosphorus trichloride is then continuously sprayed into the kettle using a spray mechanism. Simultaneously, coolant is introduced into the jacket of the kettle to maintain a temperature below 5°C. This allows the liquid phosphorus trichloride to contact the upper layer of hydrochloric acid in the kettle, where it hydrolyzes to form hydrogen chloride gas. This hydrogen chloride gas is then piped into the cartap (a pesticide used to kill stem borers) production vessel. This method presents the following challenges:
[0003] First, because a spray mechanism is used to continuously spray liquid phosphorus trichloride into a jacketed glass-lined kettle equipped with a stirring mechanism, the liquid phosphorus trichloride can only be sprayed onto the upper layer of hydrochloric acid. The phosphorus trichloride fails to react completely and is sent through the pipeline into the cartap production kettle along with the hydrogen chloride gas, affecting the product quality of the cartap. In addition, because hydrogen chloride gas contains phosphorus, when it is directly sent into the cartap production kettle through the pipeline, the phosphorus in the hydrogen chloride gas will accumulate on the inner wall of the pipeline. After a long period of accumulation, the phosphorus on the inner wall of the pipeline will accumulate more and more, making it very easy to cause an explosion. Once an explosion occurs, the operation must be stopped for maintenance. This is not only unsafe, but also reduces production efficiency.
[0004] Secondly, since phosphorus trichloride cannot react completely, a large amount of phosphorus trichloride is used, which not only increases the production cost but also affects the product quality of cartap;
[0005] Third, in order to ensure the hydrolysis effect of liquid phosphorus trichloride after contact with the upper layer of hydrochloric acid in the jacketed glass-lined kettle, the temperature of the inner cavity of the jacketed glass-lined kettle needs to be maintained below 5 degrees Celsius. In this way, refrigeration equipment is also required, which results in high energy consumption, thereby further increasing production costs. Utility Model Content
[0006] The problem to be solved by the utility model is to provide a hydrogen chloride gas phosphorus washing device for cartap production. The device can eliminate potential safety hazards, improve production efficiency, reduce production costs, and improve the product quality of cartap.
[0007] The above-mentioned problems to be solved by the present invention are achieved by the following technical solutions:
[0008] The present invention provides a hydrogen chloride gas phosphorus scrubbing device for cartap production, comprising a hydrolysis kettle having a phosphorus trichloride inlet and a first hydrogen chloride outlet. The device is characterized by including a phosphorus scrubbing mechanism comprising a hydrochloric acid tank and a phosphorus scrubbing tower above the hydrochloric acid tank. The phosphorus scrubbing tower has a spray mechanism at its top, a first hydrochloric acid outlet at its bottom, and second hydrogen chloride inlets and outlets on one side of its bottom and the other side of its top, respectively, the second hydrogen chloride inlet communicating with the first hydrogen chloride outlet. The first hydrochloric acid outlet communicates with the hydrochloric acid tank, which in turn communicates with the spray mechanism. The phosphorus trichloride inlet is located on one side of the upper end of the hydrolysis kettle and contains a delivery pipe, the inner end of which extends below the hydrochloric acid level within the hydrolysis kettle.
[0009] The phosphorus scrubbing tower comprises at least an upper section, a middle section, and a lower section; both sections are lid-shaped, with the lower section arranged in the opposite direction of the upper section. Each section contains fillers, and the lower end of the upper section is sealed to the upper section of the middle section, and the lower end of the middle section is sealed to the upper end of the lower section. The spray mechanism is located at the upper end of the upper section and communicates with the inner cavity of the upper section. The second hydrogen chloride inlet is located on one sidewall of the lower section, and the second hydrogen chloride outlet is located on the other sidewall of the upper section.
[0010] A second hydrochloric acid outlet is provided on one side of the bottom of the hydrochloric acid tank, and the second hydrochloric acid outlet is connected to the inlet of the spraying mechanism via a first pipeline and a first valve.
[0011] The second hydrogen chloride inlet is connected to the first hydrogen chloride outlet via a second pipeline.
[0012] The first hydrochloric acid outlet is connected to the inlet of the hydrochloric acid tank via a third pipe and a first valve.
[0013] A further improvement of the present invention is that there is a condenser between the first hydrochloric acid outlet and the first valve. The condenser is cylindrical, and its upper end face and lower end face respectively have an upper pit used as a hydrochloric acid distribution chamber and a lower pit used as a hydrochloric acid accumulation chamber. The mouths of the upper and lower pits are respectively provided with an upper cover and a lower cover. The upper cover and the lower cover are respectively provided with an upper center hole and a lower center hole, and the upper and lower center holes are respectively connected to the first hydrochloric acid outlet and the inlet of the first valve. Vertical holes are distributed between the bottom of the upper pit and the bottom of the lower pit, and the upper and lower ends of the vertical holes are respectively connected to the hydrochloric acid distribution chamber and the hydrochloric acid accumulation chamber.
[0014] The condenser has a first pit on its opposite outer surface, serving as a coolant distribution chamber, and a second pit on its opposite outer surface, serving as a coolant collection chamber. The openings of the first and second pits are provided with first and second covers, respectively. Transverse holes are located between the bottoms of the first and second pits, and are separated from the vertical holes. A coolant inlet and outlet are provided at the bottom of the first cover and the top of the second cover, respectively. During operation, the inlet and outlet are connected to a separate coolant tank via a water pump and a water pipe.
[0015] There are no less than two rows of vertical holes and transverse holes, and the vertical holes and transverse holes in each row are arranged alternately.
[0016] There are seven columns of vertical holes and five columns of transverse holes, and the vertical holes in each column are located between the transverse holes in adjacent columns.
[0017] The utility model also includes a cartap production kettle, which is provided with a first hydrogen chloride inlet, an exhaust port and a discharge port. The first hydrogen chloride inlet and the second hydrogen chloride outlet are connected via a fourth pipe and a second valve.
[0018] The hydrolysis kettle comprises a steel shell made of carbon steel, the inner surface of which is sprayed with a plastic lining layer.
[0019] As can be seen from the above scheme, since the utility model includes a phosphorus scrubbing mechanism, the phosphorus scrubbing mechanism includes a hydrochloric acid tank, and a phosphorus scrubbing tower is located above the hydrochloric acid tank. The phosphorus scrubbing tower has a spray mechanism at the top, a first hydrochloric acid outlet at the bottom, a second hydrogen chloride inlet on one side of the bottom, and a second hydrogen chloride outlet on the other side of the top, respectively, the second hydrogen chloride inlet being connected to the first hydrogen chloride outlet. The first hydrochloric acid outlet is connected to the hydrochloric acid tank, which is in communication with the spray mechanism. During operation, the hydrogen chloride gas produced by the hydrochloric acid in the hydrolysis kettle hydrolyzing phosphorus trichloride is first fed into the bottom of the phosphorus scrubbing tower. At the same time, the hydrochloric acid solution in the hydrochloric acid tank is fed to the spray mechanism via a first pipeline and a first water pump. The spray mechanism sprays the hydrochloric acid solution onto the packing in the phosphorus scrubbing tower, scrubbing the phosphorus-laden hydrogen chloride gas moving from bottom to top in the phosphorus scrubbing tower. Compared with the background technology, the phosphorus content of the hydrogen chloride gas entering the phosphorus scrubbing tower is greatly reduced, thereby avoiding the occurrence of safety problems such as explosion caused by the accumulation of phosphorus in the hydrogen chloride gas on the inner wall of the pipeline, eliminating safety hazards, improving production efficiency, reducing production costs, and improving the product quality of cartap.
[0020] Since the hydrolysis kettle used in the utility model is composed of a steel shell and a plastic lining layer inside the steel shell, compared with the jacketed glass-lined kettle in the background technology, it is not necessary to use a jacket to send coolant to ensure that the temperature of the kettle cavity is maintained below 5 degrees Celsius, thereby reducing energy consumption and production costs.
[0021] Furthermore, because a delivery pipe is provided in the phosphorus trichloride inlet, the inner end of the delivery pipe extends below the hydrochloric acid liquid level in the hydrolysis kettle, so that the phosphorus trichloride can enter the hydrochloric acid in the hydrolysis kettle and mix with the hydrochloric acid. Compared with the background technology, it is not necessary to equip the hydrolysis kettle with a spraying mechanism and a stirring mechanism, so that the phosphorus trichloride entering the hydrolysis kettle can be fully mixed with the hydrochloric acid, which not only reduces equipment investment but also further reduces production costs. Furthermore, because the phosphorus trichloride entering the hydrolysis kettle can be fully mixed with the hydrochloric acid, the phosphorus trichloride can react completely, thereby reducing the consumption of the phosphorus trichloride and further reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of a hydrogen chloride gas phosphorus washing device for cartap production according to the present invention;
[0023] Figure 2 yes Figure 1 an enlarged cross-sectional view of the middle condenser;
[0024] Figure 3 yes Figure 2 AA cross-sectional view of . DETAILED DESCRIPTION
[0025] The present invention will be described in further detail below with reference to the accompanying drawings.
[0026] like Figure 1 As shown, the hydrogen chloride gas phosphorus scrubbing device for cartap production includes a hydrolysis kettle 1 and a phosphorus scrubbing mechanism. The hydrolysis kettle 1 includes a steel shell 17, the inner surface of which is spray-coated with a PE plastic lining layer 18. A phosphorus trichloride inlet 11 and a first hydrogen chloride outlet 12 are respectively machined in the center and one side of the upper portion. A delivery pipe 15 is provided in the phosphorus trichloride inlet 11, the inner end of which extends below the liquid level of hydrochloric acid 16 in the hydrolysis kettle 1. The number of delivery pipes 15 can be single or multiple. The specific number depends on the volume of the hydrolysis kettle 1. In this embodiment, the number of delivery pipes 15 is single.
[0027] The phosphorus scrubbing mechanism includes a hydrochloric acid tank 3, with a phosphorus scrubbing tower 2 positioned above it. A spray mechanism 23 is located at the top of the tower 2. A first hydrochloric acid outlet 25 is formed at the bottom of the tower. A second hydrogen chloride inlet 21 and a second hydrogen chloride outlet 24 are formed on one side of the bottom and the other side of the top, respectively. The second hydrogen chloride inlet 21 communicates with the first hydrogen chloride outlet 12. The first hydrochloric acid outlet 25 is connected to the inlet of the hydrochloric acid tank 3 via a third pipe 27 and a second valve 26. A second hydrochloric acid outlet 31 is formed at one side of the bottom of the tank 3. This second hydrochloric acid outlet 31 communicates with the inlet of the spray mechanism 23 via a first pipe 33 and a first water pump 32.
[0028] To facilitate maintenance and overhaul, the phosphorus scrubbing tower 2 comprises an upper section, a middle section, and a lower section. The upper section and the lower section are both in the shape of a cover, and the lower section is arranged in the opposite direction relative to the upper section. The upper section, the middle section, and the lower section are all filled with fillers 22. The fillers 22 are corrosion-resistant Dyson balls. The lower end of the upper section and the upper section of the middle section, as well as the lower end of the middle section and the upper end of the lower section are sealed together by means of flanges, sealing rings, and screws. The spray mechanism 23 is located at the upper end of the upper section and is connected to the inner cavity of the upper section. The second hydrogen chloride inlet 21 is located on one side wall of the lower section, and the second hydrogen chloride outlet 24 is located on the other side wall of the upper section.
[0029] like Figure 2 and Figure 3 As shown, to reduce the temperature of the hydrochloric acid discharged from the first hydrochloric acid outlet 25 at the bottom of the phosphorus scrubbing tower 2, a condenser 5 is installed between the first hydrochloric acid outlet 25 and the first valve 26. The condenser 5 is cylindrical and made of graphite. Its upper and lower end surfaces are respectively machined with an upper pit for the hydrochloric acid distribution chamber 55 and a lower pit for the hydrochloric acid accumulation chamber 61. The openings of the upper and lower pits are respectively provided with an upper cover 551 and a lower cover 611. The upper cover 551 and the lower cover 611 are hermetically connected to each other via sealing rings and screws. The upper and lower covers 551 and 611 are respectively machined with an upper center hole 56 and a lower center hole 60. These upper and lower center holes are connected to the first hydrochloric acid outlet 25 and the inlet of the first valve 26 via flanges and sealing rings. Vertical holes 52 are evenly distributed between the bottom of the upper pit and the bottom of the lower pit. The upper and lower ends of the vertical holes 52 are respectively connected to the hydrochloric acid distribution chamber 55 and the hydrochloric acid accumulation chamber 61.
[0030] A first pit serving as a coolant distribution chamber 53 and a second pit serving as a coolant collection chamber 59 are formed on the outer surfaces of opposite sides of the condenser 5. The openings of the first pit and the second pit are provided with a first cover 531 and a second cover 591, respectively. The periphery of the first cover 531 and the periphery of the opening of the first pit, as well as the periphery of the second cover 591 and the periphery of the opening of the second pit, are sealed together by means of sealing rings and screws.
[0031] Transverse holes 54 are distributed between the bottoms of the first and second pits, and are separated from the vertical holes 52. A coolant inlet 51 and a coolant outlet 58 are formed on the bottom of the first cover 531 and the top of the second cover 591, respectively. During operation, the coolant inlet 51 and the coolant outlet 58 are connected to a separate coolant tank via a water pump and a water pipe.
[0032] In order to separate the transverse holes 54 from the vertical holes 52 , the vertical holes 52 and the transverse holes 54 are divided into multiple columns, and the vertical holes 52 and the transverse holes 54 in each column are arranged alternately.
[0033] In this embodiment, there are seven rows of vertical holes 52 and five rows of transverse holes 54. Each row of vertical holes 52 is located between two adjacent rows of transverse holes 52.
[0034] When the hydrogen chloride gas phosphorus scrubbing device for cartap production of the present invention is in operation, hydrogen chloride gas generated by hydrolysis of phosphorus trichloride by hydrochloric acid in the hydrolysis kettle 1 is first fed into the bottom of the phosphorus scrubbing tower 2. At the same time, hydrochloric acid in the hydrochloric acid tank 3 is fed to the spray mechanism 23 through the first pipe 33 and the first water pump 32. The spray mechanism 23 sprays the hydrochloric acid onto the packing 22 in the phosphorus scrubbing tower 2, thereby scrubbing the phosphorus-carrying hydrogen chloride gas moving from bottom to top in the phosphorus scrubbing tower 2.
[0035] In this embodiment, the purpose of using condenser 5 is to lower the temperature of the hydrochloric acid discharged from first hydrochloric acid outlet 25 into hydrochloric acid tank 3, thereby increasing the phosphorus absorption rate of filler 22 in phosphorus scrubbing tower 2. This is because a higher filler temperature results in a lower phosphorus absorption rate. Conversely, a lower filler temperature results in a higher phosphorus absorption rate.
[0036] In addition, over a long period of time, the hydrochloric acid in the hydrochloric acid tank 3 can be replaced. When the hydrochloric acid in the hydrochloric acid tank 3 is discharged into the hydrolysis kettle 1, new hydrochloric acid is poured into the hydrochloric acid tank 3 again.
[0037] During operation, the present invention is used in conjunction with a cartap production kettle 4. The cartap production kettle 4 is provided with a first hydrogen chloride inlet 41, an exhaust port 42, and a discharge port 43. Both the first hydrogen chloride inlet 41 and the exhaust port 42 are located at the top of the cartap production kettle 4, while the discharge port 43 is located at the bottom. The first hydrogen chloride inlet 41 and the second hydrogen chloride outlet 24 are connected via a fourth pipe 34 and a second valve 35.
Claims
1. A hydrogen chloride gas phosphorus scrubbing device for cartap production, comprising a hydrolysis kettle (1), the hydrolysis kettle (1) having a phosphorus trichloride inlet (11) and a first hydrogen chloride outlet (12); characterized in that: The invention also includes a phosphorus washing mechanism, which comprises a hydrochloric acid tank (3), and a phosphorus washing tower (2) above the hydrochloric acid tank (3); a spray mechanism (23) is provided on the top of the phosphorus washing tower (2), a first hydrochloric acid outlet (25) is provided at the bottom thereof, a second hydrogen chloride inlet (21) and a second hydrogen chloride outlet (24) are provided on one side of the bottom thereof and on the other side of the top thereof, respectively, the second hydrogen chloride inlet (21) is connected to the first hydrogen chloride outlet (12); the first hydrochloric acid outlet (25) is connected to the hydrochloric acid tank (3), and the hydrochloric acid tank (3) is connected to the spray mechanism (23); the phosphorus trichloride inlet (11) is located on one side of the upper end of the hydrolysis kettle (1), and a delivery pipe (15) is provided therein, the inner end of the delivery pipe (15) extending below the liquid level of the hydrochloric acid (16) in the hydrolysis kettle (1).
2. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 1, characterized in that: The phosphorus scrubbing tower (2) comprises at least an upper section, a middle section, and a lower section; the upper section and the lower section are both lid-shaped, and the lower section is arranged in the opposite direction relative to the upper section; the upper section, the middle section, and the lower section all contain fillers (22); the lower end of the upper section and the upper section of the middle section, as well as the lower end of the middle section and the upper end of the lower section, are all sealed together; the spray mechanism (23) is located at the upper end of the upper section and communicates with the inner cavity of the upper section; the second hydrogen chloride inlet (21) is located on one side wall of the lower section, and the second hydrogen chloride outlet (24) is located on the other side wall of the upper section.
3. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 1, characterized in that: A second hydrochloric acid outlet (31) is provided on one side of the bottom of the hydrochloric acid tank (3). The second hydrochloric acid outlet (31) is connected to the inlet of the spray mechanism (23) via a first pipe (33) and a first valve (32).
4. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 1, characterized in that: The second hydrogen chloride inlet (21) and the first hydrogen chloride outlet (12) are connected via a second pipe (13).
5. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 1, characterized in that: The first hydrochloric acid outlet (25) is connected to the inlet of the hydrochloric acid tank (3) via a third pipe (27) and a first valve (26).
6. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 5, characterized in that: A condenser (5) is provided between the first hydrochloric acid outlet (25) and the first valve (26). The condenser (5) is cylindrical, and has an upper pit serving as a hydrochloric acid distribution chamber (55) and a lower pit serving as a hydrochloric acid accumulation chamber (61) on its upper and lower end surfaces, respectively. The mouths of the upper and lower pits are provided with an upper cover (551) and a lower cover (611), respectively. The upper cover (551) and the lower cover (611) are provided with an upper center hole (56) and a lower center hole (60), respectively. The upper and lower center holes are connected to the first hydrochloric acid outlet (25) and the inlet of the first valve (26), respectively. Vertical holes (52) are distributed between the bottom of the upper pit and the bottom of the lower pit, and the upper and lower ends of the vertical holes (52) are connected to the hydrochloric acid distribution chamber (55) and the hydrochloric acid accumulation chamber (61), respectively. The condenser (5) has a first pit serving as a coolant distribution chamber (53) and a second pit serving as a coolant collection chamber (59) on opposite outer surfaces, and the first pit and the second pit openings have a first cover (531) and a second cover (591) respectively; transverse holes (54) are distributed between the bottoms of the first pit and the second pit, and the transverse holes (54) are separated from the vertical holes (52); The bottom of the first cover (531) and the upper part of the second cover (591) are respectively provided with a coolant inlet (51) and a coolant outlet (58). When in operation, the coolant inlet (51) and the coolant outlet (58) are connected to a separately provided coolant tank by means of a water pump and a water pipe.
7. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 6, characterized in that: The vertical holes (52) and the transverse holes (54) are both present in no less than two rows, and the vertical holes (52) and the transverse holes (54) in each row are arranged in an alternating pattern.
8. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 6, characterized in that: The vertical holes (52) and the transverse holes (54) are respectively arranged in seven columns and five columns, and the vertical holes (52) in each column are respectively located between the transverse holes (54) in adjacent columns.
9. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to claim 1, characterized in that: The invention also includes a cartap production kettle (4), which is provided with a first hydrogen chloride inlet (41), an exhaust port (42) and a discharge port (43); the first hydrogen chloride inlet (41) and the second hydrogen chloride outlet (24) are connected via a fourth pipe (34) and a second valve (35).
10. The hydrogen chloride gas phosphorus scrubbing device for cartap production according to any one of claims 1 to 9, characterized in that: The hydrolysis kettle (1) comprises a steel shell (17) made of carbon steel, the inner surface of which is sprayed with a plastic lining layer (18).