Hydrogen chloride gas phosphorus washing device for cartap production

Abstract

The invention relates to a hydrogen chloride gas phosphorus washing device for cartap production, which comprises a hydrolysis kettle provided with a phosphorus trichloride inlet and a first hydrogen chloride outlet. The device is characterized by further comprising a phosphorus washing mechanism, the phosphorus washing mechanism comprises a hydrochloric acid tank, and a phosphorus washing tower is arranged above the hydrochloric acid tank. A spraying mechanism is arranged at the top of the phosphorus washing tower, a first hydrochloric acid outlet is formed in the bottom of the phosphorus washing tower, and a second hydrogen chloride inlet and a second hydrogen chloride outlet are respectively formed in one side of the bottom and the other side of the top of the phosphorus washing tower; the first hydrochloric acid outlet is communicated with the hydrochloric acid tank which is communicated with the spraying mechanism. The phosphorus trichloride inlet is positioned on one side of the upper end of the hydrolysis kettle, a conveying pipe is arranged in the phosphorus trichloride inlet, and the inner end of the conveying pipe extends below the liquid level of hydrochloric acid in the hydrolysis kettle. According to the invention, potential safety hazards can be eliminated, the production efficiency is improved, the production cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to a phosphorus removal device, specifically, a device used to remove phosphorus in hydrogen chloride gas and unreacted phosphorus trichloride in the production process of cartap (a pesticide for killing stem borers). Background Art

[0002] It is well known in the field of cartap (pesticide for killing stem borers) production that hydrogen chloride gas is required in the synthesis stage of cartap (pesticide for killing stem borers) production process. Among them, the traditional method of obtaining hydrogen chloride gas is to first pour hydrochloric acid into a jacketed glass-lined kettle with a stirring mechanism, and the amount of hydrochloric acid poured is two-thirds of the volume of the jacketed glass-lined kettle. Then, liquid phosphorus trichloride is continuously sprayed into the jacketed glass-lined kettle with a stirring mechanism using a spray mechanism. At the same time, coolant is introduced into the jacket of the jacketed glass-lined kettle to ensure that the temperature of the inner cavity of the jacketed glass-lined kettle is below 5 degrees Celsius, so that the liquid phosphorus trichloride can contact with the upper layer of hydrochloric acid in the jacketed glass-lined kettle and then hydrolyze to form hydrogen chloride gas. The hydrogen chloride gas is sent to the cartap (pesticide for killing stem borers) generation kettle through a pipeline. The above method has the following problems: First, since the liquid phosphorus trichloride is continuously sprayed into the jacketed glass-lined kettle with a stirring mechanism by a spraying mechanism, the liquid phosphorus trichloride can only be sprayed onto the upper layer of hydrochloric acid. The phosphorus trichloride is not completely reacted and is sent to the carbendazim production kettle through the pipeline along with the hydrogen chloride gas, which affects the product quality of the carbendazim. In addition, since the hydrogen chloride gas contains phosphorus, when it is directly sent into the carbendazim 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, which is very likely to cause a deflagration. Once a deflagration occurs, the operation must be stopped for maintenance. Not only is it very unsafe, it will also reduce production efficiency; Second, since phosphorus trichloride cannot react completely, the amount of phosphorus trichloride used is relatively large, which not only increases the production cost but also affects the product quality of cartap; Third, in order to ensure the hydrolysis effect of liquid phosphorus trichloride after contacting 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. Summary of the invention

[0003] The problem to be solved by the present invention 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.

[0004] The above-mentioned problem to be solved by the present invention is achieved by the following technical solutions: The hydrogen chloride gas phosphorus washing device for the production of cartap of the present invention comprises a hydrolysis kettle, which has a phosphorus trichloride inlet and a first hydrogen chloride outlet. It is characterized in that it also comprises a phosphorus washing mechanism, which contains a hydrochloric acid tank, and a phosphorus washing tower is arranged above the hydrochloric acid tank. The phosphorus washing tower has a spray mechanism at the top, a first hydrochloric acid outlet at the bottom, a second hydrogen chloride inlet and a second hydrogen chloride outlet at one side of the bottom and the other side of the top, respectively, and the second hydrogen chloride inlet is connected to the first hydrogen chloride outlet. The first hydrochloric acid outlet is connected to the hydrochloric acid tank, and the hydrochloric acid tank is connected to the spray mechanism. The phosphorus trichloride inlet is located at one side of the upper end of the hydrolysis kettle, and a delivery pipe is arranged therein, and the inner end of the delivery pipe extends below the liquid level of the hydrochloric acid in the hydrolysis kettle.

[0005] The phosphorus washing tower at least comprises an upper section, a middle section and a lower section; the upper section and the lower section are both in a cover shape, 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, and 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 and connected together. The spray mechanism 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 is located on one side wall of the lower section, and the second hydrogen chloride outlet is located on the other side wall of the upper section.

[0006] 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 by means of a first pipeline and a first valve.

[0007] The second hydrogen chloride inlet is connected to the first hydrogen chloride outlet via a second pipeline.

[0008] The first hydrochloric acid outlet is connected to the inlet of the hydrochloric acid tank via a third pipeline and a first valve.

[0009] A further improvement of the present invention is that there is a condenser between the first hydrochloric acid outlet and the first valve, and the condenser is cylindrical, and has an upper pit used as a hydrochloric acid distribution chamber and a lower pit used as a hydrochloric acid accumulation chamber on its upper end face and lower end face respectively. The mouths of the upper and lower pits have an upper cover and a lower cover respectively. The upper cover and the lower cover have an upper center hole and a lower center hole respectively, 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 evenly 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. The outer surfaces of the opposite sides of the condenser are provided with a first pit used as a coolant distribution chamber and a second pit used as a coolant collection chamber, respectively. The first pit and the second pit opening are provided with a first cover and a second cover, respectively. The bottom of the first pit and the bottom of the second pit are evenly provided with transverse holes, which are separated from the vertical holes. The bottom of the first cover and the upper part of the second cover are provided with a coolant inlet and a coolant outlet, respectively. When working, the coolant inlet and the coolant outlet are connected to a separately provided coolant tank by means of a water pump and a water pipe.

[0010] The vertical holes and the transverse holes are both in no less than two rows, and the vertical holes and the transverse holes in each row are arranged alternately.

[0011] The vertical holes and the transverse holes are respectively in seven rows and five rows, and the vertical holes in each row are respectively located between the transverse holes in adjacent rows.

[0012] The invention 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 is connected to the second hydrogen chloride outlet via a fourth pipeline and a second valve.

[0013] The hydrolysis kettle comprises a steel shell which is made of carbon steel and has a plastic lining sprayed on its inner surface.

[0014] It can be seen from the above scheme that since the present invention contains a phosphorus washing mechanism, the phosphorus washing mechanism contains a hydrochloric acid tank, and a phosphorus washing tower is arranged above the hydrochloric acid tank. The top of the phosphorus washing tower is provided with a spray mechanism, and the bottom thereof is provided with a first hydrochloric acid outlet, and one side of the bottom and the other side of the top thereof are provided with a second hydrogen chloride inlet and a second hydrogen chloride outlet, respectively, and the second hydrogen chloride inlet is connected to the first hydrogen chloride outlet. The first hydrochloric acid outlet is connected to the hydrochloric acid tank, and the hydrochloric acid tank is connected to the spray mechanism. During operation, the hydrogen chloride gas generated after the hydrochloric acid in the hydrolysis kettle hydrolyzes phosphorus trichloride is first sent to the bottom of the phosphorus washing tower, and the hydrochloric acid solution in the hydrochloric acid tank is sent to the spray mechanism through the first pipeline and the first water pump, and the spray mechanism sprays the hydrochloric acid solution onto the filler in the phosphorus washing tower, and the phosphorus-carrying hydrogen chloride gas moving from bottom to top in the phosphorus washing tower is washed. Compared with the background technology, the phosphorus content of the hydrogen chloride gas entering the phosphorus washing tower is greatly reduced, the phosphorus in the hydrogen chloride gas is avoided to accumulate on the inner wall of the pipeline and cause safety problems such as explosion, the potential safety hazard is eliminated, the production efficiency is improved, the production cost is reduced, and the product quality of cartap is improved.

[0015] Since the hydrolysis kettle used in the present invention 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 cooling liquid to ensure that the temperature of the kettle cavity is maintained below 5 degrees Celsius, thereby reducing energy consumption and production costs.

[0016] Furthermore, since 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, the phosphorus trichloride entering the hydrolysis kettle can be fully mixed with the hydrochloric acid without being equipped with a spraying mechanism and a stirring mechanism on the hydrolysis kettle, which not only reduces equipment investment, but also further reduces production costs. Furthermore, since the phosphorus trichloride entering the hydrolysis kettle can be fully mixed with the hydrochloric acid, the phosphorus trichloride can react completely, thereby reducing the amount of phosphorus trichloride used, further reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a hydrogen chloride gas phosphorus washing device for cartap production of the present invention; Figure 2 yes Figure 1 an enlarged cross-sectional schematic diagram of a middle condenser; Figure 3 yes Figure 2 AA cross-sectional view of . DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, the hydrogen chloride gas phosphorus washing device for the production of carbendazim comprises a hydrolysis kettle 1 and a phosphorus washing mechanism. The hydrolysis kettle 1 comprises a steel shell 17, the inner surface of which is sprayed with a PE lining plastic layer 18, and a phosphorus trichloride inlet 11 and a first hydrogen chloride outlet 12 are processed at the center and one side of the upper part thereof, respectively. A delivery pipe 15 is arranged in the phosphorus trichloride inlet 11, and the inner end of the delivery pipe 15 extends below the liquid level of the hydrochloric acid 16 in the hydrolysis kettle 1. The number of the delivery pipes 15 may be single or multiple. The specific number depends on the volume of the hydrolysis kettle 1. In this embodiment, the number of the delivery pipe 15 is single.

[0020] The phosphorus washing mechanism comprises a hydrochloric acid tank 3, and a phosphorus washing tower 2 is arranged above the hydrochloric acid tank 3. A spray mechanism 23 is arranged on the top of the phosphorus washing tower 2, and a first hydrochloric acid outlet 25 is processed at the bottom thereof, and a second hydrogen chloride inlet 21 and a second hydrogen chloride outlet 24 are processed at one side of the bottom and the other side of the top thereof, respectively, and 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 inlet of the hydrochloric acid tank 3 by means of a third pipe 27 and a second valve 26. A second hydrochloric acid outlet 31 is processed at one side of the bottom of the hydrochloric acid tank 3, and the second hydrochloric acid outlet 31 is connected to the inlet of the spray mechanism 23 by means of a first pipe 33 and a first water pump 32.

[0021] For the convenience of maintenance and overhaul, the phosphorus washing 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 filler 22 is a corrosion-resistant Dyson ball. The lower end of the upper section and the upper section of the middle section, and 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.

[0022] like Figure 2 and Figure 3 As shown, in order to reduce the temperature of the hydrochloric acid discharged from the first hydrochloric acid outlet 25 at the bottom of the phosphorus washing tower 2, a condenser 5 is arranged between the first hydrochloric acid outlet 25 and the first valve 26. The condenser 5 is cylindrical and made of graphite. The upper end surface and the lower end surface thereof are respectively processed with an upper pit used as a hydrochloric acid distribution chamber 55 and a lower pit used as a hydrochloric acid accumulation chamber 61. The mouths 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 mouth of the upper pit are connected to each other in a sealed manner by means of a sealing ring and screws. The upper cover 551 and the lower cover 611 are respectively processed with an upper center hole 56 and a lower center hole 60, and the upper and lower center holes are respectively connected to the first hydrochloric acid outlet 25 and the inlet of the first valve 26 by means of a flange and a sealing ring. Vertical holes 52 are evenly 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 respectively connected to the hydrochloric acid distribution chamber 55 and the hydrochloric acid accumulation chamber 61.

[0023] The outer surfaces of the opposite sides of the condenser 5 are respectively processed with a first pit used as a coolant distribution chamber 53 and a second pit used as a coolant collection chamber 59, and the openings of the first pit and the second pit are respectively provided with a first cover 531 and a second cover 591. The periphery of the first cover 531 and the periphery of the pit opening of the first pit, and the periphery of the second cover 591 and the periphery of the pit opening of the second pit are sealed together by means of sealing rings and screws.

[0024] The bottom of the first pit and the bottom of the second pit are evenly distributed with transverse holes 54, which 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 processed with a coolant inlet 51 and a coolant outlet 58. When working, the coolant inlet 51 and the coolant outlet 58 are connected to a separately equipped coolant tank by means of a water pump and a water pipe.

[0025] 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 a plurality of columns, and the vertical holes 52 and the transverse holes 54 in each column are arranged alternately.

[0026] In this example, 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.

[0027] When the hydrogen chloride gas phosphorus washing device for cartap production of the present invention is in operation, the hydrogen chloride gas generated by the hydrolysis of phosphorus trichloride by the hydrochloric acid in the hydrolysis kettle 1 is first sent to the bottom of the phosphorus washing tower 2, and the hydrochloric acid in the hydrochloric acid tank 3 is sent to the spray mechanism 23 through the first pipeline 33 and the first water pump 32. The spray mechanism 23 sprays the hydrochloric acid onto the filler 22 in the phosphorus washing tower 2, and washes the phosphorus-carrying hydrogen chloride gas moving from bottom to top in the phosphorus washing tower 2.

[0028] In this embodiment, the purpose of using the condenser 5 is to reduce the temperature of the hydrochloric acid discharged into the hydrochloric acid tank 3 from the first hydrochloric acid outlet 25, thereby increasing the absorption rate of phosphorus by the filler 22 in the phosphorus washing tower 2. Because, when the filler temperature is high, the absorption rate of phosphorus is low. On the contrary, the absorption rate of phosphorus is high.

[0029] In addition, over time, the hydrochloric acid in the hydrochloric acid tank 3 can be replaced. While 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.

[0030] When the present invention is working, it is used in conjunction with a cartap production kettle 4. The cartap production kettle 4 is processed with a first hydrogen chloride inlet 41, an exhaust port 42 and a discharge port 43. The first hydrogen chloride inlet 41 and the exhaust port 42 are both located at the top of the cartap production kettle 4, and the discharge port 43 is located at the bottom of the cartap production kettle 4. The first hydrogen chloride inlet 41 is connected to the second hydrogen chloride outlet 24 by means of a fourth pipeline 34 and a second valve 35.

Claims

1. A hydrogen chloride gas phosphorus scrubbing device for cartap production, comprising a hydrolysis kettle (1), wherein the hydrolysis kettle (1) is provided with a phosphorus trichloride inlet (11) and a first hydrogen chloride outlet (12); the device is characterized in that: The invention also comprises a phosphorus washing mechanism, which comprises a hydrochloric acid tank (3), and a phosphorus washing tower (2) is arranged above the hydrochloric acid tank (3); a spray mechanism (23) is arranged at the top of the phosphorus washing tower (2), a first hydrochloric acid outlet (25) is arranged at the bottom of the tower, a second hydrogen chloride inlet (21) and a second hydrogen chloride outlet (24) are arranged at one side of the bottom and the other side of the top, 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 at one side of the upper end of the hydrolysis kettle (1), and a delivery pipe (15) is arranged therein, and the inner end of the delivery pipe (15) extends below the liquid level of the hydrochloric acid (16) in the hydrolysis kettle (1).

2. The hydrogen chloride gas phosphorus washing device for cartap production according to claim 1, characterized in that: The phosphorus washing tower (2) comprises at least an upper section, a middle section and a lower section; the upper section and the lower section are both in a cover shape, and the lower section is arranged in the opposite direction 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, and the lower end of the middle section and the upper end of the lower section are all sealed and connected 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 washing 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), and the second hydrochloric acid outlet (31) is connected to the inlet of the spray mechanism (23) via a first pipeline (33) and a first valve (32).

4. The hydrogen chloride gas phosphorus washing device for cartap production according to claim 1, characterized in that: The second hydrogen chloride inlet (21) is connected to the first hydrogen chloride outlet (12) via a second pipeline (13).

5. The hydrogen chloride gas phosphorus washing 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 pipeline (27) and a first valve (26).

6. The hydrogen chloride gas phosphorus washing 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 for serving as a hydrochloric acid distribution chamber (55) and a lower pit for serving as a hydrochloric acid accumulation chamber (61) on its upper and lower end surfaces, respectively. The mouths of the upper and lower pits have an upper cover (551) and a lower cover (611), respectively. The upper cover (551) and the lower cover (611) have an upper center hole (56) and a lower center hole (60), respectively, and 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 evenly distributed between the pit bottoms of the upper pit and the pit bottoms 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 cooling liquid distribution chamber (53) and a second pit serving as a cooling liquid collection chamber (59) on the opposite outer surfaces thereof, and the first pit and the second pit openings have a first cover (531) and a second cover (591) respectively; transverse holes (54) are evenly distributed between the pit 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 provided with a coolant inlet (51) and a coolant outlet (58), respectively. 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 washing 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 manner.

8. The hydrogen chloride gas phosphorus washing device for cartap production according to claim 6, characterized in that: The vertical holes (52) and the transverse holes (54) are respectively provided 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 washing device for cartap production according to claim 1, characterized in that: The invention also comprises a cartap production kettle (4), on which a first hydrogen chloride inlet (41), an exhaust port (42) and a discharge port (43) are provided; the first hydrogen chloride inlet (41) and the second hydrogen chloride outlet (24) are connected via a fourth pipeline (34) and a second valve (35).

10. The device for washing phosphorus with hydrogen chloride gas for cartap production according to any one of claims 1 to 9, characterized in that: The hydrolysis kettle (1) comprises a steel shell (17) which is made of carbon steel and has a plastic lining layer (18) sprayed on its inner surface.

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