A catalyst drying system

Abstract

The application discloses a catalyst drying system and belongs to the technical field of catalyst drying.The catalyst drying system comprises a disproportionation reactor, the disproportionation reactor is connected with a methanol storage tank through a methanol conveying pipeline, a first valve and a first conveying pump are arranged on the methanol conveying pipeline, the disproportionation reactor is connected with a first storage tank through a first pipeline, the first storage tank is connected with a first membrane filtering device through a second pipeline, a second conveying pump is arranged on the second pipeline, the first membrane filtering device is connected with a second storage tank through a third pipeline, the second storage tank is connected with the disproportionation reactor through a fourth pipeline, methanol is conveyed and pumped into the disproportionation reactor through the conveying pipeline to take out water in the catalyst, and the methanol enters the first storage tank through the first pipeline, the methanol in the first storage tank is conveyed and pumped into the first membrane filtering device through the second pipeline to separate methanol and water, the separated methanol enters the second storage tank through the third pipeline, and the methanol is conveyed and pumped into the disproportionation reactor through the third pipeline to realize recycling.

Description

Technical Field

[0001] This application relates to the field of catalyst drying technology, and more particularly to a catalyst drying system. Background Technology

[0002] In related technologies, silanes or hydrochlorosilanes are produced by disproportionating higher hydrochlorosilanes or mixtures of such hydrochlorosilanes in the presence of a catalyst (such as a resin catalyst). Before use, the catalyst is washed with ultrapure water in one or more steps and transferred to the reactor where the disproportionation reaction takes place in a wet state. To avoid hydrolysis of the chlorosilanes, the catalyst needs to be dried. Related technologies employ methods such as nitrogen drying and solvent displacement followed by drying. In processes using methanol, a large amount of methanol is required for displacement, resulting in waste. Summary of the Invention

[0003] The purpose of this application is to provide a catalyst drying system to solve the problem of low utilization and waste caused by drying catalysts with methanol in related technologies.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] This application provides a catalyst drying system, comprising:

[0006] A methanol storage tank, wherein the methanol storage tank is used to store methanol;

[0007] A disproportionation reactor, wherein the disproportionation reactor is connected to the methanol storage tank via a methanol delivery pipeline, and the methanol delivery pipeline is equipped with a first valve and a first delivery pump;

[0008] The first storage tank is connected to the disproportionation reactor via a first pipeline;

[0009] A first membrane filtration device is connected to the first storage tank via a second pipeline. The first membrane filtration device is used to separate water and methanol. A second delivery pump is provided on the second pipeline.

[0010] The second storage tank is connected to the first membrane filtration device via a third pipeline to receive methanol separated by the first membrane filtration device. The second storage tank is connected to the disproportionation reactor via a fourth pipeline, and a third delivery pump is installed on the fourth pipeline.

[0011] This application utilizes methanol to replace water in the catalyst of a disproportionation reactor. A methanol storage tank stores high-purity methanol (with a water content of less than 1%). The high-purity methanol is pumped into the disproportionation reactor via a pipeline. In the disproportionation reactor, the high-purity methanol carries away the water from the catalyst and enters the first storage tank through a first pipeline. The methanol, diluted with water, entering the first storage tank, is then pumped to a first membrane filter via a second pipeline. The first membrane filter separates the methanol from the water. The separated methanol then enters the second storage tank through a third pipeline and is pumped back to the disproportionation reactor via the third pipeline for recycling. This solution achieves methanol recycling through a methanol dehydration process, reducing methanol consumption, improving methanol utilization, and avoiding waste.

[0012] Optionally, the first pipeline and the fourth pipeline are equipped with online methanol concentration analyzers.

[0013] Optionally, a sixth valve is provided on the fourth pipeline, and the second storage tank is connected to the first storage tank through the sixth pipeline, and a seventh valve is provided on the sixth pipeline.

[0014] In this scheme, online methanol concentration analyzers are installed on the first and fourth pipelines. These analyzers are used to detect the methanol concentration in the first and fourth pipelines. By analyzing the methanol concentration in the first and fourth pipelines, when the difference in water concentration between the methanol and water in the first and fourth pipelines is lower than a preset value, the sixth valve can be closed and the seventh valve opened to directly return the methanol from the second storage tank to the first storage tank for circulation and dehydration. At this time, methanol can be directly supplied from the methanol storage tank to replace the water in the catalyst. Furthermore, analyzing the methanol concentration in the first pipeline allows for assessment of the moisture content of the catalyst in the disproportionation reactor.

[0015] Optionally, a nitrogen delivery pipeline is connected to the fourth pipeline, and the nitrogen delivery pipeline is equipped with a first heat exchanger and a second valve;

[0016] A fifth pipe is connected to the first pipe, and the two ends of the fifth pipe are respectively connected to the first pipe. A third valve is provided in the section of the first pipe between the two ends of the fifth pipe. A fourth valve and a fifth valve are provided on the fifth pipe. A second heat exchanger is provided in the fifth pipe between the fourth valve and the fifth valve.

[0017] Optionally, the second heat exchanger is provided with a nitrogen discharge pipe suitable for connection to an exhaust gas treatment system.

[0018] After replacing the moisture in the catalyst with methanol, this scheme further removes methanol from the catalyst by purging it out of the disproportionation reactor with nitrogen. Specifically, a nitrogen delivery pipeline is connected to the fourth pipeline, which is equipped with a first heat exchanger and a second valve. The first heat exchanger is used to heat the nitrogen. The heated nitrogen is then delivered to the disproportionation reactor through the nitrogen delivery pipeline to purge and remove the methanol. A fifth pipeline is connected to the first pipeline, with both ends connected to the first pipeline. A third valve is installed on the section of the first pipeline between the two ends of the fifth pipeline. A fourth valve and a fifth valve are installed on the fifth pipeline, and a second heat exchanger is installed between the fourth and fifth valves.

[0019] In the methanol removal process, the first and third valves are first closed to stop the methanol circulation and dehydration process. The second, fourth, and fifth valves are then opened. Next, nitrogen is supplied to the nitrogen delivery pipeline. After being heated by the first heat exchanger, the nitrogen enters the disproportionation reactor through the nitrogen delivery pipeline, purging and carrying away the methanol, thus achieving methanol removal. The methanol carried away by the purging enters the second heat exchanger through the fifth pipeline, where it is condensed and separated from the nitrogen. The separated nitrogen is then transported to the tail gas treatment system for further processing through the nitrogen emission pipeline.

[0020] Optionally, the first membrane filtration device is connected to a wastewater storage tank via a seventh pipe to transport the water separated by the first membrane filtration device to the wastewater storage tank. The wastewater storage tank is connected to a second membrane filtration device via an eighth pipe. The second membrane filtration device is used to separate water and methanol. The second membrane filtration device is also connected to the wastewater storage tank via a ninth pipe to transport the separated methanol to the wastewater storage tank. A fourth delivery pump is provided on the eighth pipe.

[0021] Optionally, the second filtration device is connected to a wastewater pipe, which is used to discharge the water separated by the second membrane filtration device.

[0022] Optionally, the wastewater storage tank is connected to a collection device via a collection pipe, and an eighth valve is provided on the collection pipe.

[0023] Compared with existing technologies, the beneficial effects achieved by this application are as follows: This application replaces water in the catalyst of a disproportionation reactor with methanol. High-purity methanol is stored in a methanol storage tank. The high-purity methanol is pumped into the disproportionation reactor via a pipeline. In the disproportionation reactor, the high-purity methanol carries away water from the catalyst and enters the first storage tank through a first pipeline. The methanol, diluted with water, entering the first storage tank, is then pumped to a first membrane filter device through a second pipeline. The first membrane filter device separates the methanol from the water. The separated methanol enters the second storage tank through a third pipeline and is then pumped back to the disproportionation reactor through the third pipeline for recycling. This application achieves methanol recycling through a methanol dehydration process, reducing methanol consumption, improving methanol utilization, and avoiding waste. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of some embodiments provided in this application.

[0026] Explanation of reference numerals in the attached drawings: 1-Methanol storage tank; 2-Disproportionation reactor; 3-First storage tank; 4-First membrane filtration device; 5-Second storage tank; 6-Wastewater storage tank; 7-Second membrane filtration device; 8-Nitrogen delivery pipeline; 9-Fifth pipeline; 11-Delivery pipeline; 12-First valve; 13-First delivery pump; 21-First pipeline; 22-Third valve; 31-Second pipeline; 32-Second delivery pump; 41-Third pipeline; 42-Seventh pipeline; 51-Fourth pipeline; 52-Third delivery pump; 53-Sixth valve; 54-Sixth pipeline; 55-Seventh valve; 61-Eighth pipeline; 62-Fourth delivery pump; 71-Ninth pipeline; 72-Wastewater pipe; 73-Eighth valve; 81-First heat exchanger; 82-Second valve; 91-Fourth valve; 92-Second heat exchanger; 93-Fifth valve. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0028] Example 1

[0029] This embodiment describes a catalyst drying system, referencing... Figure 1 The catalyst drying system in this embodiment includes a disproportionation reactor 2. The disproportionation reactor 2 contains a catalyst, such as a resin catalyst, for disproportionation to generate silanes. The disproportionation reactor 2 is connected to a methanol storage tank 1 via a methanol delivery pipeline 11, which is equipped with a first valve 12 and a first delivery pump 13. The methanol storage tank 1 stores high-purity methanol (with a water content of less than 1%). The high-purity methanol is pumped to the disproportionation reactor 2 via the delivery pipeline 11 to replace the water in the catalyst within the disproportionation reactor 2. Further, the disproportionation reactor 2 is connected to a first storage tank 3 via a first pipeline 21. The first storage tank 3 stores the water displaced by the methanol and the undisplaced methanol. The first storage tank 3 is connected to a first membrane filter via a second pipeline 31, which is equipped with a second delivery pump 32. The first membrane filter, which can be an SF30 / 30 filter element, separates water and methanol. The first membrane filter 4 is connected to a second storage tank 5 via a third pipeline 41 to receive the methanol separated by the first membrane filter. The second storage tank 5 is connected to the disproportionation reactor 2 via the fourth pipeline 51, and the fourth pipeline 51 is equipped with a third delivery pump 52.

[0030] In the process of replacing water in the catalyst with methanol, high-purity methanol is pumped to the disproportionation reactor 2 via pipeline 11. In the disproportionation reactor 2, the high-purity methanol carries away the water from the catalyst and enters the first storage tank 3 via the first pipeline 21. The methanol, diluted with water, enters the first storage tank 3 and is then pumped to the first membrane filter device 4 via the second pipeline 31. The first membrane filter device 4 separates the methanol from the water. The separated methanol then enters the second storage tank 5 via the third pipeline 41 and is pumped back to the disproportionation reactor 2 via the third pipeline 41 for recycling. Through the methanol dehydration process, methanol is recycled, reducing methanol consumption, improving methanol utilization, and avoiding waste.

[0031] Example 2

[0032] Based on the same inventive concept as Embodiment 1, refer to Figure 1 In this embodiment, an online methanol concentration analyzer is installed on the first pipeline 21 and the fourth pipeline 51. Furthermore, a sixth valve 53 is installed on the fourth pipeline 51, and the second storage tank 5 is connected to the first storage tank 3 via the sixth pipeline 54, which is equipped with a seventh valve 55.

[0033] In this embodiment, an online methanol concentration analyzer is used to detect the methanol concentration in the first pipe 21 and the fourth pipe 51. By analyzing the methanol concentration in the first pipe 21 and the fourth pipe 51, insufficient dehydration by the first membrane filter 4 is avoided, preventing methanol with high water content from entering the disproportionation reactor 2. In this embodiment, when the mass concentration difference of water in the methanol in the first pipe 21 and the fourth pipe 51 is lower than a preset value, the sixth valve 53 can be closed and the seventh valve 55 can be opened to directly return the methanol in the second storage tank 5 to the first storage tank 3 for circulation dehydration. At this time, methanol can be directly supplied through the methanol storage tank 1 to replace the water in the catalyst. In addition, when the online methanol concentration analyzer detects a low change in the methanol concentration in the first pipe 21, methanol replacement can be stopped.

[0034] After the methanol has replaced the moisture in the catalyst, this embodiment further removes methanol from the catalyst by purging the methanol out of the disproportionation reactor 2 with nitrogen.

[0035] Specifically, a nitrogen delivery pipe 8 is connected to the fourth pipe 51, and a first heat exchanger 81 and a second valve 82 are provided on the nitrogen delivery pipe 8. The first heat exchanger 81 is used to heat the nitrogen. The heated nitrogen is delivered to the disproportionation reactor 2 through the nitrogen delivery pipe to purge and carry away the methanol. Further, a fifth pipe 9 is connected to the first pipe 21, with both ends of the fifth pipe 9 connected to the first pipe 21. A third valve 22 is provided on the section of the first pipe 21 between the two ends of the fifth pipe 9. A fourth valve 91 and a fifth valve 93 are provided on the fifth pipe 9, and a second heat exchanger 92 is provided between the fourth valve 91 and the fifth valve 93. The second heat exchanger is equipped with a nitrogen discharge pipe suitable for connection to the exhaust gas treatment system.

[0036] In the methanol removal process, firstly, valves 12 and 22 are closed to stop the methanol circulation and dehydration process. Then, valves 82, 83, and 93 are opened. Next, nitrogen is supplied to nitrogen pipeline 8. After being heated by the first heat exchanger 81, the nitrogen enters the disproportionation reactor 2 through nitrogen pipeline 8, carrying away methanol and thus achieving methanol removal. The methanol carried away by the purge enters the second heat exchanger 92 through the fifth pipeline 9, where it is condensed and separated from the nitrogen. The separated nitrogen is then transported to the tail gas treatment system for further processing through the nitrogen emission pipeline.

[0037] Example 3

[0038] Based on the same inventive concept as Embodiment 1, refer to Figure 1 After separation by the first membrane filtration device 4, the separated water still contains a small amount of methanol. In this embodiment, the methanol in this portion of the water is collected by the wastewater storage tank 6 and the second membrane filtration device 7.

[0039] Specifically, the first membrane filtration device 4 is connected to a wastewater storage tank 6 via a seventh pipe 42 to transport the water separated by the first membrane filtration device 4 to the wastewater storage tank 6. The wastewater storage tank 6 is connected to a second membrane filtration device 7 via an eighth pipe 61, which is equipped with a fourth transfer pump 62. The second membrane filtration device 7 is used to separate water and methanol, and can use an SF30 / 30 filter element. The second membrane filtration device is also connected to the wastewater storage tank 6 via a ninth pipe 71 to transport the separated methanol to the wastewater storage tank 6. Further, the second filtration device is connected to a wastewater pipe 72 for discharging the water separated by the second membrane filtration device. The wastewater storage tank 6 is connected to a collection device via a collection pipe, which is equipped with an eighth valve 73.

[0040] In this embodiment, the water containing a small amount of methanol, separated by the first membrane filter 4, enters the wastewater storage tank 6 through the seventh pipe 42. The wastewater storage tank 6 then transports the water to the second membrane filter 7 through the eighth pipe 61 for further separation of water and methanol. The separated wastewater is discharged through the wastewater pipe 72. The separated methanol is returned to the wastewater storage tank 6. After the catalyst drying is complete, this portion of methanol can be recovered and reused through a collection pipe.

[0041] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. A catalyst drying system, characterized in that, include: A methanol storage tank (1) is used to store methanol; The disproportionation reactor (2) is connected to the methanol storage tank (1) via a methanol delivery pipeline (11). The methanol delivery pipeline (11) is equipped with a first valve (12) and a first delivery pump (13). The first storage tank (3) is connected to the disproportionation reactor (2) via the first pipeline (21); The first membrane filter device (4) is connected to the first storage tank (3) through the second pipeline (31). The first membrane filter device (4) is used to separate water and methanol. The second pipeline (31) is equipped with a second delivery pump (32). The second storage tank (5) is connected to the first membrane filter device (4) through the third pipe (41) to receive methanol separated by the first membrane filter device (4). The second storage tank (5) is connected to the disproportionation reactor (2) through the fourth pipe (51). The fourth pipe (51) is equipped with a third delivery pump (52).

2. The catalyst drying system according to claim 1, characterized in that, The first pipeline (21) and the fourth pipeline (51) are equipped with online methanol concentration analyzers.

3. The catalyst drying system according to claim 2, characterized in that, The fourth pipe (51) is provided with a sixth valve (53), and the second storage tank (5) is connected to the first storage tank (3) through the sixth pipe (54). The sixth pipe (54) is provided with a seventh valve (55).

4. The catalyst drying system according to claim 3, characterized in that, The fourth pipeline (51) is connected to a nitrogen delivery pipeline (8), and the nitrogen delivery pipeline (8) is equipped with a first heat exchanger (81) and a second valve (82). A fifth pipe (9) is connected to the first pipe (21). The two ends of the fifth pipe (9) are respectively connected to the first pipe (21). A third valve (22) is provided on the pipe section of the first pipe (21) between the two ends of the fifth pipe (9). A fourth valve (91) and a fifth valve (93) are provided on the fifth pipe (9). A second heat exchanger (92) is provided between the fourth valve (91) and the fifth valve (93) of the fifth pipe (9).

5. The catalyst drying system according to claim 4, characterized in that, The second heat exchanger (92) is provided with a nitrogen discharge pipe suitable for connection to the exhaust gas treatment system.

6. The catalyst drying system according to claim 1, characterized in that, The first membrane filter (4) is connected to a wastewater storage tank (6) via a seventh pipe (42) to transport the water separated by the first membrane filter (4) to the wastewater storage tank (6). The wastewater storage tank (6) is connected to a second membrane filter (7) via an eighth pipe (61). The second membrane filter (7) is used to separate water and methanol. The second membrane filter (7) is also connected to the wastewater storage tank (6) via a ninth pipe (71) to transport the separated methanol to the wastewater storage tank (6). A fourth delivery pump (62) is provided on the eighth pipe (61).

7. The catalyst drying system according to claim 6, characterized in that, The second membrane filter device (7) is connected to a wastewater pipe (72), which is used to discharge the water separated by the second membrane filter device (7).

8. The catalyst drying system according to claim 7, characterized in that, The wastewater storage tank (6) is connected to the collection device through a collection pipe, and the collection pipe is equipped with an eighth valve (73).

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