Esterification device for esterification of chlorosilane

Abstract

The utility model relates to the technical field of esterification of chlorosilane, in particular to an esterification device for esterification of chlorosilane, which comprises an esterification tower and a distributor, a raw material feed pipe and a return pipe are arranged above the left outer wall and the right outer wall of the esterification tower, and a tail gas outlet is arranged at the top of the esterification tower; the distributor is fixed in the middle of an inner cavity of the esterification tower and comprises a bottom plate and gas distribution pipes, the bottom plate is connected with the inner wall of the esterification tower, a plurality of connecting holes used for being connected with the bottom ends of the gas distribution pipes are evenly distributed in the bottom plate, and liquid holes are formed in the side edges of the connecting holes; and glass fiber lining plates are arranged on the upper surface and the lower surface of the bottom plate. By arranging the glass fiber lining plate, the heat resistance of the bottom plate can be improved, the deformation problem of the bottom plate is effectively solved, the maintenance frequency is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chlorosilane esterification, in particular to an esterification device used for chlorosilane esterification. Background Art

[0002] When chlorosilane esterification is prepared by alcoholysis, the raw materials enter the tower from the upper part of the enamel reaction tower for reaction, and the condensed reflux liquid enters the tower from the upper part at the same time. A polyfluoro distributor is installed at the tower section where the reflux pipe and the raw material pipe are inlet. The function of the distributor is to separate the gas phase and the liquid phase, and at the same time fully mix the raw materials to optimize the reaction conditions, improve the yield and conversion rate, and reduce the amplification effect caused by poor liquid distribution.

[0003] Due to defects in the manufacturing materials, pure PTFE distributors will deform when they are exposed to temperatures above 120°C for a long time. In addition, the esterification tower is usually a positive pressure environment, and the pressure on the pure PTFE distributor will be more serious, reducing its service life. The deformed PTFE distributor will cause poor liquid distribution, affect the packing efficiency, reduce the reaction yield and conversion efficiency, and increase production costs.

[0004] Based on the above reasons, the utility model provides an esterification device for esterification of chlorosilane. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an esterification device for chlorosilane esterification. By arranging a glass fiber lining, the heat resistance of the base plate can be improved, the deformation problem of the base plate can be effectively improved, the maintenance frequency can be reduced, and the production cost can be reduced.

[0006] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is:

[0007] The utility model discloses an esterification device for esterification of chlorosilane, comprising an esterification tower and a distributor, wherein a raw material feed pipe and a reflux pipe are arranged above the left and right outer walls of the esterification tower, and a tail gas outlet is arranged on the top of the esterification tower; the distributor is fixed to the middle part of the inner cavity of the esterification tower, and comprises a bottom plate and a gas distribution pipe, the bottom plate is connected to the inner wall of the esterification tower, a plurality of connection holes for connecting the bottom ends of the gas distribution pipes are evenly distributed on the bottom plate, and liquid holes are arranged on the sides of the connection holes; glass fiber lining plates are arranged on the upper and lower surfaces of the bottom plate.

[0008] The air distribution pipe is a tubular structure with a closed top, and the upper part of the outer wall of the air distribution pipe is provided with four air holes in a circular array.

[0009] An internal thread is arranged on the inner wall of the connecting hole, and an external thread matching and engaging with the internal thread is arranged at the lower part of the outer wall of the gas distribution pipe.

[0010] The gas distribution pipe is made of glass fiber.

[0011] The exhaust gas outlet is connected to the left side of the top of the first condenser, and a secondary exhaust gas outlet is provided on the right side of the top of the first condenser, and a first condensate outlet is provided at the bottom; the secondary exhaust gas outlet is connected to the bottom of the side wall of the second condenser, and a tertiary exhaust gas outlet is provided on the top of the second condenser, and a second condensate outlet is provided at the bottom of the second condenser, and the first condensate outlet and the second condensate outlet are connected to the reflux pipe above the outer wall of the esterification tower.

[0012] The beneficial effects of the utility model are:

[0013] The utility model can improve the heat resistance of the bottom plate by arranging the glass fiber lining plate, effectively improve the deformation problem of the bottom plate, reduce the maintenance frequency, and reduce the production cost;

[0014] The HCL gas generated by the reaction of the utility model is condensed by the first condenser and the second condenser and refluxed from the first condensate outlet and the second condensate outlet to the esterification tower for further reaction. The utilization rate of the tail gas can be improved by multiple condensation of the two condensers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a top view of the distributor in the utility model;

[0017] Figure 3 for Figure 2 Section along AA;

[0018] Figure 4 It is a partial structural cross-sectional view of the bottom plate of the utility model.

[0019] In the figure: 1 esterification tower, 2 distributor, 3 raw material feed pipe, 4 reflux pipe, 5 tail gas outlet, 6 first condenser, 7 second condenser, 21 bottom plate, 22 gas distribution pipe, 23 connecting hole, 24 liquid hole, 25 glass fiber lining board, 26 gas hole. DETAILED DESCRIPTION

[0020] The utility model is further described below:

[0021] See also Figure 1-4 ,

[0022] The utility model discloses an esterification device for esterification of chlorosilane, comprising an esterification tower 1 and a distributor 2, wherein a raw material feed pipe 3 and a reflux pipe 4 are arranged above the left and right outer walls of the esterification tower 1, and a tail gas outlet 5 is arranged at the top of the esterification tower 1; the distributor 2 is fixed to the middle of the inner cavity of the esterification tower 1, and the distributor 2 comprises a bottom plate 21 and a gas distribution pipe 22, wherein the bottom plate 21 is connected to the inner wall of the esterification tower 1, and a plurality of connection holes 23 for connecting the bottom end of the gas distribution pipe 22 are evenly distributed on the bottom plate 21, and liquid holes 24 are arranged on the sides of the connection holes 23; glass fiber lining plates 25 are arranged on the upper surface and the lower surface of the bottom plate 21, and the heat resistance of the bottom plate 21 can be improved by arranging the glass fiber lining plates 25, and the deformation problem of the bottom plate 21 can be effectively improved, the maintenance frequency can be reduced, and the production cost can be reduced.

[0023] Working process: The mixed liquid of chlorosilane and alcohol enters the esterification tower 1 from the raw material feed pipe 3, is dispersed through the liquid hole 24 of the new distributor 2, and the reaction releases heat to generate HCl gas. The internal temperature can reach up to 170°C. The gasified product in the tower leaves the esterification tower 1 from the gas hole 26 on the gas distribution pipe 22 of the distributor 2, is condensed by the first condenser 6 and the second condenser 7, and refluxes from the reflux pipe 4 to the esterification tower 1, and is dispersed into the tower through the liquid hole 24 of the distributor 2 to continue the reaction.

[0024] Furthermore, the gas distribution pipe 22 is a tubular structure with a closed top, which prevents the raw materials entering the esterification tower 1 from the raw material feed pipe 3 from directly entering the bottom of the inner cavity of the esterification tower 1 through the top of the gas distribution pipe 22, thereby making the effect of the distributor 2 poor; there are four air holes 26 in a circular array on the upper side of the outer wall of the gas distribution pipe 22, ensuring that the HCL gas generated by the reaction can be discharged from the air holes 26.

[0025] Furthermore, an internal thread is provided on the inner wall of the connecting hole 23 , and an external thread matching and engaging with the internal thread is provided below the outer wall of the gas distribution pipe 22 , so as to facilitate the installation, disassembly and replacement of the gas distribution pipe 22 .

[0026] Furthermore, the gas distribution pipe 22 is made of glass fiber. Since glass fiber has good heat resistance, it can prevent the reaction from generating a large amount of heat, which may cause the polytetrafluoroethylene distributor to deform due to heat.

[0027] Furthermore, the tail gas outlet 5 is connected to the left side of the top of the first condenser 6, and a secondary tail gas outlet 61 is provided on the right side of the top of the first condenser 6, and a first condensate outlet 62 is provided at the bottom; the secondary tail gas outlet 61 is connected to the lower side wall of the second condenser 7, and a tertiary tail gas outlet 71 is provided on the top of the second condenser 7, and a second condensate outlet 72 is provided at the bottom of the second condenser 7. The first condensate outlet 62 and the second condensate outlet 72 are connected to the reflux pipe 4 above the outer wall of the esterification tower 1. The tail gas in the tail gas outlet 32 ​​contains HCl gas. The HCl gas is condensed by the first condenser 6 and the second condensate outlet 7 and refluxed from the first condensate outlet 62 and the second condensate outlet 72 to the esterification tower 1 to continue the reaction. Multiple condensation by two condensers can improve the utilization rate of the tail gas.

[0028] The above description is only an embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent transformation made by using the contents of the specification and drawings of the present utility model or directly or indirectly applied in the relevant technical field is also included in the patent protection scope of the present utility model.

Claims

1. An esterification device for esterification of chlorosilanes, characterized in that: It comprises an esterification tower (1) and a distributor (2), wherein a raw material feed pipe (3) and a reflux pipe (4) are provided above the left and right outer walls of the esterification tower (1), and an exhaust gas outlet (5) is provided at the top of the esterification tower (1); The distributor (2) is fixed to the middle of the inner cavity of the esterification tower (1), and comprises a bottom plate (21) and a gas distribution pipe (22). The bottom plate (21) is connected to the inner wall of the esterification tower (1), and a plurality of connection holes (23) for connecting the bottom end of the gas distribution pipe (22) are evenly distributed on the bottom plate (21), and liquid holes (24) are provided on the sides of the connection holes (23); Glass fiber lining plates (25) are provided on the upper surface and the lower surface of the bottom plate (21).

2. The esterification device for esterification of chlorosilane according to claim 1, characterized in that: The gas distribution pipe (22) is a tubular structure with a closed top, and four air holes (26) are arranged in a circular array on the outer wall of the gas distribution pipe (22).

3. An esterification device for esterification of chlorosilanes according to claim 2, characterized in that: An internal thread is provided on the inner wall of the connection hole (23), and an external thread matching and engaging with the internal thread is provided below the outer wall of the gas distribution pipe (22).

4. The esterification device for esterification of chlorosilane according to claim 3, characterized in that: The gas distribution pipe (22) is made of glass fiber.

5. The esterification device for esterification of chlorosilane according to claim 1, characterized in that: The tail gas outlet (5) is communicated with the left side of the top of the first condenser (6); a secondary tail gas outlet (61) is provided on the right side of the top of the first condenser (6), and a first condensate outlet (62) is provided at the bottom; the secondary tail gas outlet (61) is communicated with the lower side of the side wall of the second condenser (7); a tertiary tail gas outlet (71) is provided on the top of the second condenser (7), and a second condensate outlet (72) is provided at the bottom of the second condenser (7); the first condensate outlet (62) and the second condensate outlet (72) are communicated with the reflux pipe (4) above the outer wall of the esterification tower (1).

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