A single-unit distillation aluminum trichloride recovery device

Abstract

This utility model discloses a single-unit distillation aluminum trichloride recovery device. The gas outlet of the disproportionation vessel is connected to the gas inlets of two sets of cooling devices via pipelines. The gas outlets of both sets of cooling devices are connected to the gas inlet of the disproportionation tower. The cooling device includes several vertically arranged gas phase pipes, with jackets fixedly fitted on the outer walls of the gas phase pipes. The outlet of the circulating water supply main pipe is connected to the inlet of the jacket, and the outlet of the jacket is connected to the inlet of the circulating water return main pipe. The advantages of this utility model are: the connection structure is simple and easy to implement, achieving the effect of separating AlCl3 from the mixed single-unit gas. The remaining gas phase enters the disproportionation tower for further gas-solid separation. The separated AlCl3 can be directly recovered and reused as a catalyst, realizing the effective utilization of AlCl3 resources. At the same time, it reduces the failure rate of the packing in the disproportionation tower, effectively improving the service life of the disproportionation tower.

Description

Technical fields:

[0001] This utility model relates to an aluminum trichloride recovery device, and more particularly to a single-unit distillation aluminum trichloride recovery device. Background technology:

[0002] The process of producing dimethyldichlorosilane specifically includes: using AlCl3 as a catalyst, a chlorosilane disproportionation reaction occurs in a disproportionation reactor, converting low-value-added products from the methylchlorosilane production process, such as monomethyltrichlorosilane, low-boiling-point substances, high-boiling-point substances, trimethylmonochlorosilane, and azeotropes, into a mixed monomer gas containing high-value-added and widely used dimethyldichlorosilane and trimethylmonochlorosilane. The mixed monomer gas produced by disproportionation then undergoes gas-solid separation in a disproportionation tower to separate high-boiling-point substances and other impurities from the gas. However, the mixed monomer gas contains AlCl3 catalyst, which is carried into the disproportionation tower. As impurities adhere to the packing material, this accelerates the failure of the tower packing, reduces the service life of the disproportionation tower, and prevents the recovery of the AlCl3 catalyst, resulting in resource waste. Utility model content:

[0003] The purpose of this invention is to provide a single-unit distillation aluminum trichloride recovery device with a simple connection structure, which realizes the effective utilization of AlCl3 resources and improves the service life of the disproportionation tower.

[0004] This utility model is implemented by the following technical solution: The purpose of this patent is to provide a single-unit distillation aluminum trichloride recovery device, which includes a disproportionation kettle, a disproportionation tower, and two sets of cooling devices. The gas outlet of the disproportionation kettle is connected to the gas inlet of the two sets of cooling devices through pipes, and the gas outlet of the two sets of cooling devices is connected to the gas inlet of the disproportionation tower. The cooling device includes several vertically arranged gas phase pipes. A jacket is fixedly fitted on the outer wall of the gas phase pipe. The outlet of the circulating water supply main pipe is connected to the inlet of the jacket, and the outlet of the jacket is connected to the inlet of the circulating water return main pipe. The gas outlet of the disproportionation kettle is connected to the gas inlet below the gas phase pipe, and the gas outlet above the gas phase pipe is connected to the gas inlet of the disproportionation tower.

[0005] Furthermore, it also includes a solenoid valve, a first flow sensor, a second flow sensor, and a controller. The solenoid valve and the first flow sensor are sequentially installed on the pipeline between the disproportionation vessel and the cooling device, and the second flow sensor is installed on the pipeline between the cooling device and the disproportionation tower. The signal output terminals of the first flow sensor and the second flow sensor are both connected to the signal input terminal of the controller via signal connection, and the signal output terminal of the controller is connected to the signal input terminal of the solenoid valve via signal connection.

[0006] Furthermore, a cleaning port is provided at the bottom of the gas phase pipe, and a cleaning door panel is installed on the cleaning port.

[0007] Advantages of this invention: The connection structure of this invention is simple and easy to implement. By setting up two sets of cooling devices, one for standby and one for use, the mixed monomer gas discharged from the disproportionation vessel is cooled to a temperature of 120-125℃, causing AlCl3 to deposit on the wall of the gas phase tube, thereby achieving the effect of separating AlCl3 from the mixed monomer gas. The remaining gas phase enters the disproportionation tower for further gas-solid separation. The separated AlCl3 can be directly recovered and reused as a catalyst, realizing the effective utilization of AlCl3 resources. At the same time, it reduces the failure rate of the packing in the disproportionation tower and effectively improves the service life of the disproportionation tower. Attached image description:

[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0010] 1. Disproportionation vessel, 2. Disproportionation tower, 3. Cooling device, 31. Gas phase pipe, 311. Cleaning port, 32. Jacket, 33. Circulating water supply main pipe, 34. Circulating water return main pipe, 35. Cleaning door panel, 4. Solenoid valve, 5. First flow sensor, 6. Second flow sensor, 7. Controller. Detailed implementation method:

[0011] Example: Figure 1 As shown, a single-unit distillation aluminum trichloride recovery device includes a disproportionation vessel 1, a disproportionation tower 2, two sets of cooling devices 3, a solenoid valve 4, a first flow sensor 5, a second flow sensor 6, and a controller 7. The outlet of the disproportionation vessel 1 is connected to the inlet of the two sets of cooling devices 3 through pipes, and the outlet of each set of cooling devices 3 is connected to the inlet of the disproportionation tower 2. The cooling device 3 includes eight vertically arranged gas phase pipes 31, and a jacket 32 ​​is fixedly fitted on the outer wall of the gas phase pipes 31. The outlet of the circulating water supply main pipe 33 is connected to the inlet of the jacket 32, and the outlet of the jacket 32 ​​is connected to the inlet of the circulating water return main pipe 34. The outlet of the disproportionation vessel 1 is connected to the inlet below the gas phase pipes 31, and the outlet above the gas phase pipes 31 is connected to the inlet of the disproportionation tower 2. A cleaning port 311 is provided at the bottom of the gas phase pipes 31, and a cleaning door plate 35 is installed on the cleaning port 311.

[0012] A solenoid valve 4 and a first flow sensor 5 are sequentially installed on the pipeline between the disproportionation vessel 1 and the cooling device 3. A second flow sensor 6 is installed on the pipeline between the cooling device 3 and the disproportionation tower 2. The signal output terminals of the first flow sensor 5 and the second flow sensor 6 are both connected to the signal input terminal of the controller 7 via signal connection. The signal output terminal of the controller 7 is connected to the signal input terminal of the solenoid valve 4 via signal connection.

[0013] Working principle: After the reaction in the disproportionation reactor 1, the mixed monomer gas first enters the eight gas phase pipes 31 of the first cooling device 3. Circulating water is introduced into the jackets 32 on the outside of the eight gas phase pipes 31 for cooling, so that the temperature inside the gas phase pipes 31 is 120-125℃. AlCl3 is deposited on the pipe wall of the gas phase pipes 31, realizing the separation of AlCl3 from the mixed monomer gas. The remaining gas phase enters the disproportionation tower 2 for further gas-solid separation. The separated AlCl3 can be directly recovered and reused as a catalyst, realizing the effective utilization of AlCl3 resources. At the same time, it reduces the failure rate of the packing in the disproportionation tower 2 and effectively improves the service life of the disproportionation tower 2.

[0014] The first flow sensor 5 and the second flow sensor 6 respectively detect the flow rates at the inlet and outlet of the first cooling device 3 and transmit the signals to the controller 7. When the flow rate difference between the inlet and outlet of the first cooling device 3 is greater than the set value, the controller 7 controls the solenoid valve 4 at the inlet of the first cooling device 3 to close and simultaneously controls the solenoid valve 4 at the inlet of the second cooling device 3 to open, so that the second cooling device 3 can be used for cooling. The cleaning door 35 of the gas phase pipe 31 of the first cooling device 3 is manually opened to clean the inside of the gas phase pipe 31, and the cleaned AlCl3 is collected and directly reused as a catalyst.

[0015] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A monomer rectification aluminum chloride recovery device comprising a disproportionation kettle and a disproportionation tower, characterized by, It also includes two sets of cooling devices. The outlet of the disproportionation reactor is connected to the inlet of each of the two sets of cooling devices via pipes. The outlet of each of the two sets of cooling devices is connected to the inlet of the disproportionation tower. The cooling device includes several vertically arranged gas phase pipes. A jacket is fixedly fitted on the outer wall of the gas phase pipe. The outlet of the circulating water supply main pipe is connected to the inlet of the jacket. The outlet of the jacket is connected to the inlet of the circulating water return main pipe. The outlet of the disproportionation reactor is connected to the inlet below the gas phase pipe. The outlet above the gas phase pipe is connected to the inlet of the disproportionation tower.

2. The single monomer rectification aluminum chloride recovery device according to claim 1, characterized in that, It also includes a solenoid valve, a first flow sensor, a second flow sensor, and a controller. The solenoid valve and the first flow sensor are sequentially installed on the pipeline between the disproportionation vessel and the cooling device, and the second flow sensor is installed on the pipeline between the cooling device and the disproportionation tower. The signal output terminals of the first flow sensor and the second flow sensor are both connected to the signal input terminal of the controller via signal connection, and the signal output terminal of the controller is connected to the signal input terminal of the solenoid valve via signal connection.

3. The single monomer rectifying aluminum chloride recovery device according to claim 1 or 2, characterized in that, A cleaning port is provided at the bottom of the gas phase pipe, and a cleaning door panel is installed on the cleaning port.

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