Pressurizing condensing device for recovering tail gas in production of vinyltrimethoxysilane

Abstract

The utility model provides a pressurizing and condensing device for recovering tail gas in production of vinyltrimethoxysilane. The pressurizing and condensing device comprises a shell, a pressurizing device and a condensing device, the input port and the output port are arranged at the head end and the tail end of the shell, and the conveying pipe is connected with the input port and the output port. The material conveying pipe is connected with the interior of the shell, and the cooling liquid conveying system is connected with the interior of the shell. The partition plate is arranged between the upper cavity and the lower cavity; a tail gas conveying system is also arranged in the shell; and the nitrogen conveying system is connected with the inside and the outside of the shell. The conveying pipe is divided into the upper cavity and the lower cavity through the partition plate, the tail gas conveying system and the nitrogen conveying system are correspondingly introduced into the two cavities, tail gas and nitrogen are separated, meanwhile, the nitrogen can pass through the through holes formed in the partition plate, and the through holes are used for compensating the pressure difference of the tail gas relative to the conveying pipe when the tail gas is converted from a gas phase to a liquid phase. When the tail gas is converted from a gas phase to a liquid phase, the pressure is reduced, so that the hydrochloric acid volatilization and condensation effects are poor.

Description

Technical Field

[0001] The utility model relates to the technical field of organosilicon synthesis, in particular to a pressurized condensing device for recovering tail gas from vinyltrimethylsilane production. Background Art

[0002] During the production of vinyltrimethoxysilane, the system pressure is only -30 to -40 kPa, so the tail materials generated are mainly in the form of gas. The tail gas generated includes hydrogen chloride gas, alcohols, vinyltrimethoxysilane products and reaction raw materials. Since the main component of the above tail gas, hydrogen chloride, exists in the form of gas, it is difficult for raw materials and other materials to be condensed at normal temperature and pressure.

[0003] However, when existing devices condense the tail gas produced by vinyltrimethoxysilane, the condensation effect is less than ideal because hydrochloric acid and alcohols are volatile and easily soluble in solvents such as water and ethanol, and can be miscible with these solvents. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the tail gas produced by vinyltrimethoxysilane is not recovered effectively by condensing it with circulating water.

[0005] In order to achieve the above-mentioned purpose, the present application proposes a pressurized condensation device for recovering tail gas from the production of vinyltrimethoxysilane, comprising: a shell; an input port and an output port arranged at the head and tail ends of the shell; a feed pipe arranged inside the shell and a coolant delivery system connected to the inside of the shell, characterized in that the feed pipe includes an upper cavity; a lower cavity and a partition arranged between the upper cavity and the lower cavity; an exhaust gas delivery system is also arranged inside the shell; a nitrogen delivery system connecting the inside and outside of the shell; and a gas condensation and compression system arranged in front of the input port.

[0006] The present application discloses a pressurized condensing device for recovering tail gas from the production of vinyltrimethoxysilane. The gas is pressurized to above 300 kPa through a gas condensation compression system to convert the gas into liquid. The present application divides the feed pipe into two upper and lower cavities through a partition, and introduces a tail gas delivery system and a nitrogen delivery system into the corresponding two cavities respectively to separate the tail gas from the nitrogen. At the same time, the through holes provided on the partition can pass nitrogen to compensate for the pressure difference of the tail gas relative to the feed pipe when the tail gas is converted from the gas phase to the liquid phase, thereby solving the problem in the prior art of hydrochloric acid volatilization and poor condensation effect caused by the pressure reduction when the tail gas is converted from the gas phase to the liquid phase.

[0007] As an improvement to the above-mentioned partition of the present application, in order to realize the pressure compensation effect of the nitrogen delivery system on the exhaust gas delivery system, a through hole connecting the upper cavity and the lower cavity is provided on the partition.

[0008] Furthermore, in order to ensure the effect of nitrogen compensation, the diameter of the through holes on the separator is 5 to 10 mm.

[0009] As an improvement to the above-mentioned nitrogen delivery system of the present application, in order to input nitrogen into the pressurized condensing device and ensure the stability of the nitrogen delivery process, the nitrogen delivery system includes: a nitrogen input end and a nitrogen output end that penetrate the end surfaces of the input port and the output port; a nitrogen tube plate arranged inside the shell and at a certain distance from the input port and the output port; a gas storage tank connected to the nitrogen input end and the nitrogen output end, and a pressure gauge arranged on the gas storage tank.

[0010] As an improvement to the above-mentioned exhaust gas delivery system of the present application, in order to input exhaust gas into the pressurized condensing device, the exhaust gas delivery system includes: a pipe body extending into the interior of the shell and penetrating the exhaust gas input end and exhaust gas output end of the nitrogen tube plate; and an exhaust gas tube plate arranged in a direction away from the input port and the output port and at a certain distance from the nitrogen tube plate.

[0011] Furthermore, in order to ensure that the exhaust gas can flow smoothly into the lower cavity, a semicircular hole that is the same size as the lower cavity is opened on the exhaust pipe plate, and the exhaust pipe plate is installed at the output and input ends of the feed pipe, connecting the lower cavity to form a second chamber.

[0012] Furthermore, in order to ensure that nitrogen can flow smoothly into the upper cavity, a semicircular tube that is the same size as the upper cavity is provided on the nitrogen tube plate, and the end of the semicircular tube is connected to the surface of the tail gas tube plate, forming a closed space first chamber with the upper cavity.

[0013] The beneficial effects of this application are:

[0014] 1. The present application discloses a pressurized condensing device for transporting high-temperature materials and for recovering tail gas from the production of vinyltrimethoxysilane. The feed pipe is divided into two upper and lower cavities by a partition, and an exhaust gas delivery system and a nitrogen delivery system are respectively introduced into the corresponding two cavities to separate the exhaust gas from the nitrogen. At the same time, the through holes provided on the partition can pass nitrogen to compensate for the pressure difference relative to the feed pipe when the exhaust gas is converted from the gas phase to the liquid phase, thereby solving the problem in the prior art of hydrochloric acid volatilization and poor condensation effect caused by the pressure reduction when the exhaust gas is converted from the gas phase to the liquid phase.

[0015] 2. The tail gas tube plate and nitrogen tube plate in this application only require two gas delivery ports to independently input the tail gas and nitrogen into the lower cavity and upper cavity of the feed pipe, while ensuring the independence of the tail gas delivery system and the nitrogen delivery system.

[0016] 3. The nitrogen delivery system of the present application is provided with a gas storage tank and a pressure gauge. The value of the pressure gauge can be used to observe the delivery of nitrogen in the entire nitrogen delivery system. At the same time, nitrogen is discharged from the nitrogen output end and can flow back to the gas storage tank through the feed pipe to achieve nitrogen recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a pressurized condensing device for recovering tail gas from vinyltrimethoxysilane production in an embodiment of the present application;

[0019] Figure 2 This is a cross-sectional view of a pressurized condensing device for recovering tail gas from vinyltrimethoxysilane production in an embodiment of the present application;

[0020] Figure 3 This is another cross-sectional view of a pressurized condensing device for recovering tail gas from vinyltrimethoxysilane production according to an embodiment of the present application;

[0021] Figure 4 This is a schematic structural diagram of the tail gas pipe plate in an embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of the structure of the nitrogen tube plate in the embodiment of this application.

[0023] Description of reference numerals:

[0024] 1. Shell;

[0025] 2. Input port;

[0026] 3. Output port;

[0027] 4. Feed pipe; 41. Upper cavity; 42. Lower cavity; 43. Partition;

[0028] 5. Coolant delivery system;

[0029] 6. Exhaust gas delivery system; 61. Exhaust gas input end; 62. Exhaust gas output end; 63. Exhaust gas pipe plate; 64. Second chamber;

[0030] 7. Nitrogen delivery system; 71. Nitrogen input; 72. Nitrogen output; 73. Nitrogen tube sheet; 74. Gas storage tank; 75. Pressure gauge; 76. First chamber;

[0031] 8. Gas condensation and compression system. DETAILED DESCRIPTION

[0032] The following will be combined with the Figures 1 to 3 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

[0033] like Figures 1-2 The present application illustrates a pressurized condensing device for recovering tail gas from the production of vinyltrimethoxysilane, comprising: a shell 1; an input port 2 and an output port 3 arranged at both ends of the shell 1, and a feed pipe 4 connecting the input port 2 and the output port 3; a coolant delivery system 5 connected to the inside of the shell 1, characterized in that the feed pipe 4 includes an upper cavity 41; a lower cavity 42 and a partition 43 arranged between the upper cavity 41 and the lower cavity 42; an exhaust gas delivery system 6 is also arranged inside the shell 1; a nitrogen delivery system 7 connecting the inside and outside of the shell 1; and a gas condensation compression system 8 arranged in front of the input port 2.

[0034] In one embodiment of the present application, the shell 1 provides installation space for other devices while withstanding the internal high temperature and high pressure environment; the input port 2 and the output port 3 arranged at the head and tail ends of the shell are used for the input of exhaust gas and the output of condensate; the input port 2 and the output port 3 are used to connect the input ports and output ports of different systems; the feed pipe 4 is divided into two parts, an upper cavity 41 and a lower cavity 42 by a partition 43, wherein the upper cavity 41 is used to introduce nitrogen, and the lower cavity 42 is used to introduce exhaust gas; the exhaust gas delivery system 6 and the nitrogen delivery system 7 are used to control the input and output of exhaust gas and nitrogen respectively, and the condensation compression system 8 pressurizes the gas to above 300kPa to convert the gas into liquid.

[0035] In the prior art, the recovery of tail gas from vinyltrimethoxysilane production is achieved through a pressurized condensation device. However, during the condensation process of the tail gas in the feed pipe, the tail gas will be converted from the gas phase to the liquid phase. During the process of the gas phase to the liquid phase, its pressure relative to the feed pipe wall will gradually decrease, causing the effect of the pressurized condensation to gradually decrease. When the condensation effect decreases, due to the volatility of hydrochloric acid, part of the hydrochloric acid will be converted from the liquid phase to the gas phase, reducing the condensation effect.

[0036] In one embodiment of the present application, the gas entering the device is first pressurized to above 300 kPa by the body condensation compression system 8 to convert the gas into liquid. At the same time, the feed pipe is divided into two upper and lower cavities by a partition, and the exhaust gas delivery system and the nitrogen delivery system are introduced into the corresponding two cavities respectively to separate the exhaust gas from the nitrogen. At the same time, the through holes set on the partition can pass nitrogen to compensate for the pressure difference of the exhaust gas relative to the feed pipe when it is converted from gas phase to liquid phase, which solves the problem in the prior art that when the exhaust gas is converted from gas phase to liquid phase, the pressure drop causes the volatilization of hydrochloric acid and the poor condensation effect.

[0037] Preferably, the housing 1 is made of corrosion-resistant material, such as stainless steel, so that the housing 1 has sufficient strength and sealing performance to ensure that the device does not leak during operation.

[0038] Furthermore, the input port 2 and the output port 3 are respectively provided at the head and tail ends of the shell, and the ports are connected by flanges to facilitate docking with the pipeline system.

[0039] Preferably, the partition 43 is made of a high temperature resistant and corrosion resistant material to ensure stable operation in a high temperature and high pressure environment.

[0040] Furthermore, the partition plate 43 is evenly distributed with through holes with a diameter of 5 to 10 mm. These through holes allow nitrogen to flow from the upper cavity into the lower cavity to compensate for the pressure difference generated when the exhaust gas is condensed.

[0041] Furthermore, the coolant delivery system 5 includes a coolant inlet, a coolant circulation pump, and a coolant outlet, which is responsible for delivering coolant into the shell to condense the exhaust gas. The coolant is selected from a high-efficiency heat transfer medium, such as ethylene glycol water solution, to improve condensation efficiency.

[0042] Continue to refer to Figure 3 In a further embodiment, the exhaust gas delivery system 6 includes an exhaust gas input port 61, an exhaust gas output port 62, and an exhaust gas duct plate 63. The exhaust gas input port 61 is located near the input port 2. The exhaust gas duct plate 63 is connected to the lower cavity 42 to ensure that the exhaust gas smoothly enters the lower cavity 42 for condensation. The exhaust gas output port is located near the output port to discharge the gas that has not been completely condensed.

[0043] Continue to refer to Figure 3 In a further embodiment, the nitrogen delivery system 7 includes a nitrogen input port 71, a nitrogen output port 72, a nitrogen tube plate 73, a gas storage tank 74, and a pressure gauge 75. The nitrogen input port 71 is located near the input port 2, and the nitrogen tube plate 73 is connected to the upper cavity 41 to ensure that nitrogen can enter the upper cavity 41 smoothly. The gas storage tank 74 is used to store nitrogen and discharge excess nitrogen through the nitrogen output port 72. The pressure gauge 75 monitors the nitrogen pressure in the gas storage tank 74 in real time to ensure the stability of the nitrogen delivery process.

[0044] Continue to refer to Figure 3 In a further embodiment, the relative positions of the nitrogen tube plate 73 and the tail gas tube plate 63 are as follows: the nitrogen tube plate 73 is closer to the two ends of the shell 1, and the tail gas tube plate 63 is arranged on the side of the nitrogen tube plate 73 away from the two ends of the shell 1.

[0045] Please refer to Figure 4 In a further embodiment, a semicircular hole that is congruent with the lower cavity 42 is opened on the tail gas pipe plate 63, and the tail gas pipe plate 63 is installed at the output end and the input end of the conveying pipe 4, connecting the lower cavity 42 to form a second cavity 64. Specifically, the exhaust gas is transported as follows: from the exhaust gas input end 61 into the input port 2, through the first cavity 76, filled in the second cavity 64, and then flows into the lower cavity 42 of the conveying pipe 4, and then passes through the conveying pipe 4 to the second cavity 64 on the other side, and finally flows out from the exhaust gas output end 62.

[0046] Please refer to Figure 5 In a further embodiment, the nitrogen tube plate 73 is provided with a semicircular tube congruent with the upper cavity 41. The end of the semicircular tube is connected to the surface of the tail gas tube plate 63, forming a first chamber 76 with the upper cavity 41. Specifically, the nitrogen is transported as follows: it enters the input port 2 from the nitrogen input end 71, fills the first chamber 76, flows into the upper cavity 41 of the feed pipe 4, then passes through the feed pipe 4 to the first chamber 76 on the other side, and finally flows out from the nitrogen output end 72 into the gas storage tank 74, completing the nitrogen cycle.

[0047] The working principle of the entire pressurized condensing unit is as follows:

[0048] Tail gas input: The tail gas produced by vinyl trimethoxysilane enters the lower chamber through the input port. The tail gas contains components such as hydrochloric acid, alcohols, and vinyl trimethoxysilane. Hydrochloric acid is volatile and requires special treatment.

[0049] Nitrogen compensation: At the same time, nitrogen enters the upper chamber through the nitrogen inlet and flows into the lower chamber through the holes in the partition. The role of nitrogen is to compensate for the pressure difference caused by the condensation of the exhaust gas, preventing the hydrochloric acid from volatilizing due to the pressure drop.

[0050] Condensation process: Coolant enters the shell through the coolant delivery system and condenses the exhaust gas in the lower cavity. During the condensation process, components such as hydrochloric acid, alcohols, and vinyltrimethylsilane in the exhaust gas gradually transform into liquid phase and flow downward along the delivery pipe.

[0051] Tail gas output: The gas that is not completely condensed is discharged through the tail gas output end discharge device for subsequent treatment or discharge.

[0052] Nitrogen recovery: After the excess nitrogen is discharged through the nitrogen output end, it can flow back to the gas storage tank for recycling, realizing the recycling of nitrogen.

[0053] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0054] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "disposed," "equipped with," "connected," and "installed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can be directly connected or indirectly connected through an intermediate medium. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressurized condensing device for recovering tail gas from vinyltrimethoxysilane production, comprising: A shell (1), an input port (2) and an output port (3) arranged at the front and rear ends of the shell (1); a feed pipe (4) arranged inside the shell (1) and a coolant delivery system (5) connected to the inside of the shell (1), characterized in that the feed pipe (4) includes an upper cavity (41); a lower cavity (42) and a partition (43) arranged between the upper cavity (41) and the lower cavity (42); an exhaust gas delivery system (6) is also arranged inside the shell (1); a nitrogen delivery system (7) connecting the inside and outside of the shell (1), and a gas condensation compression system (8) arranged in front of the input port (2).

2. The pressurized condensing device according to claim 1, characterized in that The partition (43) is provided with a through hole connecting the upper cavity (41) and the lower cavity (42).

3. The pressurized condensing device according to claim 1, characterized in that The diameter of the through hole on the partition (43) is 5 to 10 mm.

4. The pressurized condensing device according to claim 1, characterized in that The nitrogen delivery system (7) comprises: a nitrogen input end (71) and a nitrogen output end (72) penetrating the two end surfaces of the input port (2) and the output port (3); a nitrogen tube plate (73) arranged inside the housing (1) and at a certain distance from the input port (2) and the output port (3); a gas storage tank (74) connecting the nitrogen input end (71) and the nitrogen output end (72), and a pressure gauge (75) arranged on the gas storage tank (74).

5. The pressurized condensing device according to claim 1 or 4, characterized in that: The exhaust gas delivery system (6) comprises: a pipe body extending into the interior of the housing (1) and penetrating the exhaust gas input end (61) and the exhaust gas output end (62) of the nitrogen tube plate (73); and an exhaust gas tube plate (63) arranged in a direction away from the input port (2) and the output port (3) and at a certain distance from the nitrogen tube plate (73).

6. The pressurized condensing device according to claim 5, characterized in that: The tail gas pipe plate (63) is provided with a semicircular hole that is the same size as the lower cavity (42), and the tail gas pipe plate (63) is installed at the output end and the input end of the feed pipe (4), and is connected to the lower cavity (42) to form a second chamber (64) in a closed space.

7. The pressurized condensing device according to claim 6, characterized in that: The nitrogen tube plate (73) is provided with a semicircular tube that is congruent with the upper cavity (41), and the end of the semicircular tube is connected to the surface of the tail gas tube plate (63), forming a first chamber (76) of a closed space with the upper cavity (41).

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