Organic silicon high-boiling cracking tower kettle separation structure

Abstract

The utility model discloses an organic silicon high-boiling cracking tower kettle separation structure which is suitable for a connecting structure between a high-boiling cracking kettle and a cracking tower of an organic silicon production high-boiling cracking device, the connecting structure mainly comprises a gas phase pipeline, a liquid phase pipeline and a liquid level control inverted U-shaped bend, one end of the gas phase pipeline is connected with a gas phase outlet of the high-boiling cracking kettle, and the other end of the gas phase pipeline is connected with a liquid level control inverted U-shaped bend. The other end is connected to a gas phase inlet of the high-boiling cracking tower; one end of the liquid-phase pipeline is connected to a liquid-phase inlet of the high-boiling cracking kettle, the other end of the liquid-phase pipeline is connected to a liquid-phase outlet of the high-boiling cracking tower, and the liquid level control inverted U-shaped bend is connected to a horizontal pipe section of the liquid-phase pipeline; the connecting structure replaces an expansion joint connecting structure in the traditional process, and has the advantages that the high-boiling cracking tower can be completely separated from the kettle, gas-liquid double-phase separation is realized between the gas-phase pipeline and the liquid-phase pipeline, the production efficiency can be improved by 30%, and the maintenance period is greatly shortened.

Description

Technical Field

[0001] This utility model relates to a high-boiling-point pyrolysis system for organosilicon, belonging to the field of organosilicon production technology. Background Technology

[0002] Traditional high-boiling-point pyrolysis units for organosilicon typically connect the pyrolysis vessel and the pyrolysis tower via expansion joints. These expansion joints serve multiple functions, including gas-liquid phase transfer between the tower and vessel, and also need to alleviate thermal stress between them. This dual function leads to uneven contact between the gas and liquid phases over a considerable distance, resulting in low mass transfer efficiency and significant heat waste. Furthermore, because the high-boiling-point pyrolysis unit operates intermittently with slag discharge, the expansion joints have a short lifespan and require periodic replacement to avoid leakage risks. Therefore, it is necessary to optimize the connection structure between the tower and vessel in high-boiling-point pyrolysis. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a separation structure for the reactor of a high-boiling-point pyrolysis tower for organosilicon. Compared to traditional structures, this structure can significantly improve the intrinsic safety of high-boiling-point pyrolysis production and increase its efficiency.

[0004] The technical solution of the present invention provides a separation structure for a high-boiling-point pyrolysis tower of organosilicon. The separation structure includes a high-boiling-point pyrolysis vessel, a high-boiling-point pyrolysis tower, a gas phase pipeline, a liquid phase pipeline, and a liquid level control inverted U-shaped bend.

[0005] One end of the liquid phase pipeline is connected to the liquid phase inlet at the top of the pyrolysis reactor, and the other end is connected to the liquid phase outlet at the bottom of the high-boiling pyrolysis tower. The liquid level control U-shaped bend is installed on the liquid phase pipeline, which is an inverted U-shaped pipeline.

[0006] The height of the U-shaped bend in the liquid level control tube should be greater than or equal to 200mm from the tangent of the lower end cap of the high-boiling cracking tower.

[0007] A valve is installed between the inverted U-shaped bend for liquid level control and the liquid phase pipeline.

[0008] One end of the gas phase pipeline is connected to the gas phase inlet at the bottom of the high-boiling cracking tower, and the other end is connected to the gas phase outlet at the top of the cracking reactor.

[0009] A root valve is installed at the liquid phase outlet; a root valve is installed at the liquid phase inlet.

[0010] A root valve is installed at the gas phase inlet and a root valve is installed at the gas phase outlet.

[0011] The spatial arrangement of gas phase pipelines and liquid phase pipelines eliminates system thermal stress.

[0012] In this invention, a high-boiling pyrolysis reaction occurs in a high-boiling pyrolysis reactor, producing a mixed monomer of chlorosilanes with lower volatility. After being heated by steam in the pyrolysis reactor jacket, the high-boiling product is vaporized and transported through a gas phase pipeline to a high-boiling pyrolysis tower. The upper part of the gas phase inlet of the pyrolysis tower is the packing material for the high-boiling pyrolysis tower. Mass and heat transfer occur between the gas phase of the pyrolysis tower and the reflux liquid of the high-boiling pyrolysis tower on the packing material. Through staged distillation, the mixed monomer of chlorosilanes is obtained at the top of the high-boiling pyrolysis tower, and the high-boiling product is obtained at the bottom of the tower. The high-boiling product flows back to the high-boiling pyrolysis reactor by gravity through a liquid phase pipeline. Because a U-shaped bend for liquid level control is installed on the liquid phase pipeline, when the valve is closed, the high-boiling product accumulates at the bottom of the high-boiling pyrolysis tower, and the liquid level can be automatically controlled at 200 mm. The static pressure generated by this liquid level can effectively prevent the gas phase in the high-boiling pyrolysis reactor from entering the liquid phase pipeline, thus achieving the separation of the gas and liquid phases. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of a traditional connection structure.

[0014] R1': High-boiling-point pyrolysis vessel; T1': High-boiling-point pyrolysis tower; P1': Expansion joint;

[0015] Figure 2 This is a schematic diagram of the connection structure of the present invention.

[0016] R1: High-boiling-point pyrolysis vessel; T1: High-boiling-point pyrolysis tower; G1: Gas phase pipeline; G2: Liquid phase pipeline; G3: Inverted U-shaped bend; N1: Gas phase inlet; N2: Liquid phase outlet; N3: Liquid phase inlet; N4: Gas phase outlet; F1: Gas phase inlet root valve; F2: Inverted U-shaped bend horizontal shut-off valve; F3: Liquid phase inlet root valve; F4: Gas phase outlet root valve; F5: Liquid phase outlet root valve. Detailed Implementation

[0017] Traditional connection structure:

[0018] A high-boiling cracking reaction occurs in the high-boiling cracking reactor R1', producing a mixed monomer of chlorosilanes with lower volatility. After being heated by steam in the cracking reactor jacket, the high-boiling product is vaporized and passes through the expansion joint P1' to the bottom of the high-boiling cracking tower T1'. The top of the bottom of the cracking tower T1' is packed with high-boiling cracking tower packing. Mass and heat transfer occur between the gas phase of the cracking tower and the reflux liquid of the high-boiling cracking tower on the packing inside the cracking tower. The mixed monomer of chlorosilanes is obtained from the top of the high-boiling cracking tower through staged distillation, and the high-boiling product is obtained from the bottom of the tower. The high-boiling product returns to the high-boiling cracking reactor R1' through the expansion joint P1'. The rising gas phase from the cracking reactor and the reflux liquid phase from the cracking tower both pass through the expansion joint P1', and the gas and liquid phases are not separated.

[0019] Example 1

[0020] A separation structure for a high-boiling-point cracking tower of organosilicon includes a high-boiling-point cracking vessel R1, a high-boiling-point cracking tower T1, a gas phase pipeline G1, a liquid phase pipeline G2, and a liquid level control inverted U-shaped bend G3.

[0021] One end of the liquid phase pipeline G2 is connected to the liquid phase inlet N3 at the top of the pyrolysis reactor R1, and the other end is connected to the liquid phase outlet N2 at the bottom of the high-boiling pyrolysis tower T1. The liquid level control inverted U-shaped bend G3 is installed on the liquid phase pipeline G2 and is an inverted U-shaped pipeline.

[0022] The height of the U-shaped bend G3 for level control is equal to 200 mm of the tangent of the lower head of the high-boiling cracking tower T1.

[0023] A valve F2 is installed between the inverted U-shaped bend G3 for liquid level control and the liquid phase pipeline G2.

[0024] One end of the gas phase pipeline G1 is connected to the gas phase inlet N1 at the bottom of the high-boiling cracking tower T1, and the other end is connected to the gas phase outlet N4 at the top of the cracking vessel R1.

[0025] A root valve F5 is installed on the liquid phase outlet N2; a root valve F3 is installed on the liquid phase inlet N3.

[0026] A root valve F1 is installed on the gas phase inlet N1, and a root valve F4 is installed on the gas phase outlet N4.

[0027] The gas phase pipeline G1 and the liquid phase pipeline G2 are arranged in a spatial manner to eliminate system thermal stress.

[0028] During normal system operation, the gas phase inlet root valve F1, liquid phase inlet root valve F3, gas phase outlet root valve F4, and liquid phase outlet root valve F5 are all in the open state, while the inverted U-shaped horizontal blocking valve F2 is in the closed state.

[0029] After the system is shut down, opening the gas phase inlet root valve F1, the liquid phase inlet root valve F3, the gas phase outlet root valve F4, and the inverted U-shaped horizontal blocking valve F2 will allow all the liquid in the cracking tower to flow back into the high-boiling cracking vessel by gravity.

[0030] After the system is shut down, closing the root valves F1 (gas phase inlet), F3 (liquid phase inlet), and F4 (gas phase outlet) will disconnect the gas phase pipeline G1 and the liquid phase pipeline G2 from the high-boiling-point cracking system, allowing for quick maintenance.

Claims

1. A separation structure for the bottom of a high-boiling-point pyrolysis tower for organosilicon, characterized in that, The high-boiling-point pyrolysis tower separation structure includes a high-boiling-point pyrolysis vessel (R1), a high-boiling-point pyrolysis tower (T1), a gas phase pipeline (G1), a liquid phase pipeline (G2), and a liquid level control inverted U-shaped bend (G3). One end of the liquid phase pipeline (G2) is connected to the liquid phase inlet (N3) at the top of the pyrolysis vessel (R1), and the other end is connected to the liquid phase outlet (N2) at the bottom of the high-boiling pyrolysis tower (T1). The liquid level control U-shaped bend (G3) is installed on the liquid phase pipeline (G2) and is an inverted U-shaped pipeline.

2. The separation structure of the organosilicon high-boiling pyrolysis tower according to claim 1, characterized in that, The height of the U-shaped bend (G3) for level control is greater than or equal to 200 mm above the tangent of the lower head of the high-boiling cracking tower (T1).

3. The separation structure of the organosilicon high-boiling pyrolysis tower according to claim 1, characterized in that, A valve (F2) is installed between the liquid level control U-shaped bend (G3) and the liquid phase pipeline (G2).

4. The separation structure of the organosilicon high-boiling pyrolysis tower according to claim 1, characterized in that, One end of the gas phase pipeline (G1) is connected to the gas phase inlet (N1) at the bottom of the high-boiling cracking tower (T1), and the other end is connected to the gas phase outlet (N4) at the top of the cracking vessel (R1).

5. The separation structure of the organosilicon high-boiling pyrolysis tower according to claim 1, characterized in that, A root valve (F5) is installed on the liquid phase outlet (N2); a root valve (F3) is installed on the liquid phase inlet (N3).

6. The separation structure of the organosilicon high-boiling pyrolysis tower according to claim 4, characterized in that, A root valve (F1) is installed on the gas phase inlet (N1), and a root valve (F4) is installed on the gas phase outlet (N4).

7. The organosilicon high-boiling-point pyrolysis tower reboiler separation structure according to claim 1, characterized in that, The gas phase pipeline (G1) and liquid phase pipeline (G2) are arranged in a spatial manner to eliminate system thermal stress.

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