Vinyltrimethylsilane production tail gas recovery system

Abstract

The utility model provides a tail gas recovery system for vinyl trimethylsilane production. Comprising a pressurized condensing device, a first rectifying tower connected to a discharge port of the pressurized condensing device, a hydrochloric acid storage tank connected to a liquid outlet of the first rectifying tower, a second rectifying device connected to a gas outlet of the first rectifying tower, and an organic alcohol storage tank connected to a liquid outlet of the second rectifying device, the third condenser is connected to a gas outlet of the second rectification device; the vinyltrimethylsilane storage tank is connected to a liquid outlet of the third condenser; wherein a first feed port of the pressurized condensing device is connected to the vinyl trimethylsilane production tail gas, and a second feed port of the pressurized condensing device is connected to the deionized water liquid storage tank. The vinyltrimethylsilane production tail gas recovery system provided by the utility model can effectively separate and recover different components in the vinyltrimethylsilane production tail gas, and improves the resource utilization rate.

Description

Technical Field

[0001] The present application relates to the technical field of chemical production, and in particular to a tail gas recovery system for the production of vinyltrimethylsilane. Background Art

[0002] As an important organosilicon compound, vinyltrimethylsilane is widely used in chemical production. However, during the production process of vinyltrimethylsilane, a certain amount of tail gas will be generated, which mainly includes hydrochloric acid, alcohols and unreacted vinyltrimethylsilane. The direct discharge of these tail gas components will not only pollute the environment, but also waste recyclable resources.

[0003] Most existing technologies use condensation heat exchange methods to separate and recover production tail gas. However, hydrochloric acid, as the main acidic component in tail gas, has a relatively low boiling point and is highly corrosive. During the tail gas treatment process, hydrochloric acid will first evaporate to form acidic gas, which will not only cause serious corrosion to the tail gas recovery system, affecting the service life and safety of the system, but may also cause environmental pollution problems. Utility Model Content

[0004] The utility model aims to provide a vinyltrimethylsilane production tail gas recovery system, which can effectively separate and recover different components in the vinyltrimethylsilane production tail gas and improve resource utilization.

[0005] This application is implemented through the following technical solutions, specifically:

[0006] A vinyltrimethylsilane production tail gas recovery system comprises: a pressurized condensing device, a first distillation tower connected to the discharge port of the pressurized condensing device, a hydrochloric acid storage tank connected to the liquid outlet of the first distillation tower, a second distillation device connected to the gas outlet of the first distillation tower, an organic alcohol storage tank connected to the liquid outlet of the second distillation device, a third condenser connected to the gas outlet of the second distillation device, and a vinyltrimethylsilane storage tank connected to the liquid outlet of the third condenser; wherein the first feed port of the pressurized condensing device is connected to the vinyltrimethylsilane production tail gas, and the second feed port of the pressurized condensing device is connected to a deionized water storage tank.

[0007] In this scheme, hydrochloric acid, vinyltrimethylsilane and organic alcohol in the tail gas of vinyltrimethylsilane production are separated and recovered step by step by using a multi-stage distillation device to improve the utilization rate of resources. In addition, the present application connects the deionized water storage tank to the pressurized condensing device, and reduces the concentration of hydrochloric acid in the production waste liquid by mixing the production waste liquid after the production tail gas is condensed with deionized water, thereby increasing the boiling point of hydrochloric acid. Furthermore, when the production waste liquid is distilled through the first distillation tower, the hydrochloric acid no longer evaporates in the form of pure acidic gas, but is retained in the first distillation tower in liquid form, reducing the generation of corrosive acidic gas, thereby reducing the corrosion risk of the tail gas recovery system, improving the safety of the system, and reducing the impact of tail gas recovery on the environment.

[0008] As an improvement of the pressurized condensing device in the present application, the pressurized condensing device includes: a first condenser and a compressor connected to the first condenser; the first feed port of the pressurized condensing device includes the air inlet of the first condenser, and the second feed port of the pressurized condensing device includes the liquid inlet of the first condenser.

[0009] As an improvement of the pressurized condensing device in the present application, the pressurized condensing device further includes: a hydrochloric acid concentration monitor connected to the first condenser.

[0010] As an improvement of the second distillation device in the present application, the second distillation device includes: a second condenser connected to the gas outlet of the first distillation tower and a second distillation tower connected to the liquid outlet of the second condenser; the liquid outlet of the second distillation device includes the liquid outlet of the second distillation tower; the gas outlet of the second distillation device includes the gas outlet of the second distillation tower.

[0011] As an improvement of the solution of the present application, the vinyltrimethylsilane production tail gas recovery system further includes: a filter connected to the first feed inlet of the pressurized condensation device.

[0012] The beneficial effects of this application are:

[0013] 1. The solution of the present application improves the utilization rate of resources by using a multi-stage distillation device to separate and recover hydrochloric acid, vinyltrimethylsilane and organic alcohol in the tail gas produced by vinyltrimethylsilane step by step.

[0014] 2. The solution of the present application connects the deionized water storage tank to the pressurized condensing device, and reduces the concentration of hydrochloric acid in the production waste liquid by mixing the production waste liquid after the production tail gas is condensed with deionized water, thereby increasing the boiling point of hydrochloric acid. When the production waste liquid is distilled through the first distillation tower, the hydrochloric acid no longer evaporates in the form of pure acid gas, but remains in the first distillation tower in liquid form, reducing the generation of corrosive acid gas, thereby reducing the corrosion risk of the tail gas recovery system, improving the safety of the system, and reducing the impact of tail gas recovery on the environment.

[0015] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution described above, other technical problems that can be solved by the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a vinyltrimethylsilane production tail gas recovery system in an embodiment of the present application.

[0017] Description of reference numerals:

[0018] 1. Pressurized condensation device; 11. First condenser; 2. First distillation tower; 3. Hydrochloric acid storage tank; 4. Second distillation device; 41. Second condenser; 42. Second distillation tower; 5. Vinyltrimethylsilane storage tank; 6. Third condenser; 7. Organic alcohol storage tank; 8. Deionized water storage tank. DETAILED DESCRIPTION

[0019] The following will be combined with the attached Figure 1 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 used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] In view of the problems existing in the prior art in the background technology, the present application provides a vinyltrimethylsilane production tail gas recovery system. Figure 1As shown, a vinyltrimethylsilane production tail gas recovery system provided in an embodiment of the present application includes: a pressurized condensing device 1, a first distillation tower 2 connected to the discharge port of the pressurized condensing device 1, a hydrochloric acid storage tank 3 connected to the liquid outlet of the first distillation tower 2, a second distillation device 4 connected to the gas outlet of the first distillation tower 2, an organic alcohol storage tank 5 connected to the liquid outlet of the second distillation device 4, a third condenser 6 connected to the gas outlet of the second distillation device 4 and a vinyltrimethylsilane storage tank 7 connected to the liquid outlet of the third condenser 6; wherein the first feed port of the pressurized condensing device 1 is connected to the vinyltrimethylsilane production tail gas, and the second feed port of the pressurized condensing device 1 is connected to the deionized water storage tank 8.

[0021] Specifically, the components of vinyl trimethylsilane production tail gas include hydrochloric acid, alcohols, and unreacted vinyl trimethylsilane and other substances, wherein the boiling point of hydrochloric acid with a concentration of 38% is about 48°C, while the boiling point of methanol in the alcohol compound is 64.5°C, the boiling point of ethanol is between 78°C-78.5°C, and the boiling point of vinyl trimethylsilane is 55°C, all of which are higher than the boiling point of hydrochloric acid. Considering the low boiling point of hydrochloric acid, the prior art usually absorbs hydrochloric acid by chemical reaction or electrolysis when recovering hydrochloric acid in the production tail gas, and then uses the reactants to prepare hydrochloric acid, which has complicated steps and high costs. Based on the changing law of the physical properties of hydrochloric acid of different concentrations, the inventor of the present application reduces the mass fraction of hydrochloric acid in the production waste liquid obtained by the pressurized condensing device 1 by introducing deionized water, thereby achieving the effect of increasing the boiling point of hydrochloric acid. Then, a multi-stage distillation device including a first distillation tower 2, a second distillation device 4 and a third condenser 6 is used to successively separate and recover hydrochloric acid, organic alcohol and vinyltrimethylsilane in the tail gas produced by vinyltrimethylsilane production, thereby realizing efficient purification and recovery of resources.

[0022] Optionally, a hydrochloric acid concentration device may be connected between the first distillation tower 2 and the hydrochloric acid storage tank 3 to increase the concentration of the recovered hydrochloric acid.

[0023] In this embodiment, the hydrochloric acid concentration in the production waste liquid is reduced by mixing the production waste liquid after the production tail gas is condensed with deionized water, thereby increasing the boiling point of the hydrochloric acid. When the production waste liquid is distilled through the first distillation tower 2, the hydrochloric acid no longer evaporates in the form of pure acid gas, but remains in the first distillation tower 2 in the form of liquid, thereby reducing the generation of corrosive acid gas, thereby reducing the corrosion risk of the tail gas recovery system, improving the safety of the system, and reducing the impact of tail gas recovery on the environment.

[0024] Based on the previous embodiment, continue to refer to Figure 1In one implementation, the pressurized condensing device 1 includes: a first condenser 11 and a compressor connected to the first condenser 11; the first feed port of the pressurized condensing device 1 includes the air inlet of the first condenser 11, and the second feed port of the pressurized condensing device 1 includes the liquid inlet of the first condenser 11.

[0025] Specifically, the compressor is used to pressurize the vinyltrimethylsilane production tail gas introduced into the first condenser 11, thereby further improving the condensation efficiency of the first condenser 11 and causing more components in the vinyltrimethylsilane production tail gas to reach saturation and condense at low temperatures, thereby improving resource recovery efficiency. The first condenser 11 is also provided with an inlet for inputting a cooling medium.

[0026] On the basis of the previous embodiment, in one implementation, the pressurized condensation device 1 further includes: a hydrochloric acid concentration monitor connected to the first condenser 11 .

[0027] Specifically, the solution of the present application needs to ensure that the boiling point of hydrochloric acid in the production waste liquid obtained by the first condenser 11 is higher than the boiling points of alcohols and vinyltrimethylsilane. In this embodiment, a hydrochloric acid concentration monitor is set to determine the boiling point of hydrochloric acid by checking the concentration of hydrochloric acid. It should be understood that the monitoring accuracy of the hydrochloric acid concentration monitor should avoid being interfered by other substances in the production waste liquid. The hydrochloric acid concentration monitor can include at least one of a liquid chromatograph, an online salt concentration meter, and an electrochemical measuring instrument.

[0028] It should be understood that the tail gas produced by vinyltrimethylsilane also contains solid particulate matter generated during the production. In order to prevent the solid particulate matter from entering the first condenser 11 and affecting the condensation effect, in one implementation, the tail gas recovery system for vinyltrimethylsilane production also includes: a filter connected to the first feed port of the pressurized condensation device 1.

[0029] Specifically, the filter is connected to the air inlet of the first condenser 11, and is used to pre-treat the tail gas produced by vinyltrimethylsilane, remove large particle impurities, solid particles and possible catalyst fragments, etc., to ensure that only clean tail gas enters the subsequent pressurized condensing device 1. Exemplarily, a high-efficiency filter material such as a metal filter, a ceramic filter element or activated carbon can be arranged inside the filter.

[0030] The filter provided in this embodiment can, on the one hand, help improve the condensation effect of the exhaust gas and ensure the recovery rate of the condensable components; on the other hand, it can reduce the fouling and corrosion inside the first condenser 11 and extend the service life of the system.

[0031] Continue to view Figure 1In one implementation, the second distillation device 4 includes: a second condenser 41 connected to the gas outlet of the first distillation tower 2 and a second distillation tower 42 connected to the gas outlet of the second condenser 41; the liquid outlet of the second distillation device 4 includes the liquid outlet of the second distillation tower 42; the gas outlet of the second distillation device 4 includes the gas outlet of the second distillation tower 42.

[0032] Specifically, the gas discharged from the gas outlet of the first distillation tower 2 mainly contains alcohol compounds and unreacted vinyl trimethyl silane. In the second condenser 41, the difference in boiling points between alcohol compounds and vinyl trimethyl silane is utilized to control parameters such as the temperature, pressure, and reflux ratio in the tower to achieve effective separation of alcohol compounds and vinyl trimethyl silane. Then, the liquid alcohol compounds are output to the organic alcohol storage tank 5 through the liquid outlet of the second distillation tower 42 to complete the purification and recovery of the alcohol compounds, and the gaseous vinyl trimethyl silane is output to the third condenser 6 through the gas outlet of the second distillation tower 42 for recovery.

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "set", "provided with", "connected", "installed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A vinyltrimethylsilane production tail gas recovery system, characterized in that: include: A pressurized condensing device (1), a first distillation tower (2) connected to the discharge port of the pressurized condensing device (1), a hydrochloric acid storage tank (3) connected to the liquid outlet of the first distillation tower (2), a second distillation device (4) connected to the gas outlet of the first distillation tower (2), an organic alcohol storage tank (5) connected to the liquid outlet of the second distillation device (4), a third condenser (6) connected to the gas outlet of the second distillation device (4), and a vinyltrimethylsilane storage tank (7) connected to the liquid outlet of the third condenser (6); The first feed inlet of the pressurized condensation device (1) is connected to the tail gas produced by vinyltrimethylsilane, and the second feed inlet of the pressurized condensation device (1) is connected to the deionized water storage tank (8).

2. The vinyltrimethylsilane production tail gas recovery system according to claim 1, characterized in that: The pressurized condensing device (1) comprises: a first condenser (11) and a compressor connected to the first condenser (11); The first feed inlet of the pressurized condensing device (1) includes the air inlet of the first condenser (11), and the second feed inlet of the pressurized condensing device (1) includes the liquid inlet of the first condenser (11).

3. The vinyltrimethylsilane production tail gas recovery system according to claim 2, characterized in that: The pressurized condensing device (1) further comprises: a hydrochloric acid concentration monitor connected to the first condenser (11).

4. The vinyltrimethylsilane production tail gas recovery system according to claim 1, characterized in that: The second distillation device (4) comprises: a second condenser (41) connected to the gas outlet of the first distillation tower (2) and a second distillation tower (42) connected to the liquid outlet of the second condenser (41); The liquid outlet of the second rectification device (4) comprises the liquid outlet of the second rectification tower (42); The gas outlet of the second distillation device (4) includes the gas outlet of the second distillation tower (42).

5. The vinyltrimethylsilane production tail gas recovery system according to claim 1, characterized in that: Also includes: A filter connected to the first feed inlet of the pressurized condensation device (1).

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