Moisture on-line detection device for dimethyl dichlorosilane hydrolysis hydrogen chloride

Abstract

An on-line moisture detection device for dimethyl dichlorosilane hydrolysis hydrogen chloride comprises a gas conveying pipeline, a cooler, a dryer and a compressor are sequentially arranged on the gas conveying pipeline in the conveying direction, a gas inlet branch pipe is arranged on the gas conveying pipeline between the cooler and the dryer and connected to a moisture detection mechanism, and the moisture detection mechanism is connected with the compressor. And the gas conveying pipeline between the dryer and the compressor is provided with another gas inlet branch pipe, and the gas inlet branch pipe is connected to another moisture detection mechanism. By adopting the structure, the moisture content of the product hydrogen chloride can be monitored and processed in real time, the moisture content in the product hydrogen chloride is effectively controlled, and the compressor is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical detection technical field, concretely is a kind of water on-line detection device for dimethyldichlorosilane hydrolysis hydrogen chloride. BACKGROUND

[0002] At present, the hydrolysis dimethyldichlorosilane process adopted by the mainstream organic silicon production factory in domestic, its product hydrogen chloride is generally directly transported to chloromethane synthesis device by pipeline to carry out low-pressure synthesis chloromethane, its production process does not require using high-pressure hydrogen chloride, so it does not adopt compressor compression, and there is no requirement to the moisture content in the hydrolysis product hydrogen chloride, so moisture measuring instrument is seldom used in dimethyldichlorosilane hydrolysis process.

[0003] However, when adopting dimethyldichlorosilane low-pressure hydrolysis new process and gas-liquid phase catalysis process to synthesize chloromethane, high-pressure hydrogen chloride and methanol reaction are needed, so compressor is used to compress hydrogen chloride to 0.7MPa, in the process of dimethyldichlorosilane hydrolysis to produce hydrogen chloride, a large amount of water vapor is entrained in the generated hydrogen chloride, and the water vapor entering the compressor for compression can cause corrosion and damage to the compressor, so corresponding means is needed to remove the moisture in hydrogen chloride. SUMMARY

[0004] The utility model provides a kind of water on-line detection device for dimethyldichlorosilane hydrolysis hydrogen chloride, can realize the real-time monitoring and processing of the moisture content of product hydrogen chloride, effectively control the water content in product hydrogen chloride, avoid compressor damage.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is: a kind of water on-line detection device for dimethyldichlorosilane hydrolysis hydrogen chloride, including gas conveying pipeline, cooling device, dryer and compressor are sequentially provided with on gas conveying pipeline along the direction of conveyance, gas conveying pipeline between the cooling device and the dryer is equipped with intake branch pipe, intake branch pipe is connected to moisture detection mechanism, another intake branch pipe is equipped between the dryer and the compressor of gas conveying pipeline, and intake branch pipe is connected to another moisture detection mechanism.

[0006] In preferred scheme, the moisture detection mechanism includes gas chamber, and emitting probe and receiving probe are provided at both ends of the gas chamber, emitting unit is connected to emitting probe, and receiving unit is connected to receiving probe.

[0007] In preferred scheme, the moisture detection mechanism between the cooling device and the dryer is equipped with gas outlet branch pipe, and gas outlet branch pipe is connected to venting pipeline;

[0008] The moisture detection mechanism between the dryer and the compressor is also equipped with gas outlet branch pipe, and gas outlet branch pipe is connected to venting pipeline.

[0009] In a preferred embodiment, the water content detection mechanism is provided with an air inlet branch pipe, which is connected to the rotor flow meter after passing through the filter, and then connected to the gas chamber at the end close to the receiving probe;

[0010] The air outlet branch pipe is arranged at the end of the gas chamber close to the emitting probe.

[0011] In a preferred embodiment, the water content detection mechanism is further connected with an instrument air pipe, which is provided with a dryer, and the output end of the instrument air pipe is connected to the three-way ball valve before the rotor flow meter.

[0012] In a preferred embodiment, the emitting unit controls the emitting probe to emit laser beams of a set wavelength, which pass through the gas in the gas chamber, and the receiving probe sensor converts the light signals into electrical signals and transmits them to the receiving unit, which processes the signals and transmits them to the emitting unit, which calculates the water content of the measured gas by combining the temperature and pressure compensation signals and the spectrum data.

[0013] The water content online detection device for dimethyl dichlorosilane hydrolysis hydrogen chloride provided by the utility model has the following beneficial effects by adopting the above structure:

[0014] (1) By arranging the water content online detection device in the hydrogen chloride gas conveying pipeline, the water content in the hydrogen chloride can be monitored and controlled in real time, the corrosion and damage of water to the key equipment such as the compressor under high pressure conditions can be effectively avoided, and the safety and stability of the entire production system are improved;

[0015] (2) The semiconductor laser absorption spectrum (DLAS) technology is adopted to bypass process environments of various extreme harsh conditions such as high temperature, high pressure and strong corrosion, online measurement of process gas is realized, and the device has the characteristics of fast response speed, high measurement accuracy and convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described in connection with the drawings and examples:

[0017] Figure 1 It is the whole structure schematic diagram of the utility model.

[0018] Figure 2 It is the water content detection mechanism structure schematic diagram of the utility model.

[0019] In the drawing: gas conveying pipeline 1, cooler 2, dryer 3, compressor 4, water content detection mechanism 5, air inlet branch pipe 6, instrument air pipe 7, air outlet branch pipe 8, emitting unit 9, receiving unit 10, emitting probe 11, gas chamber 12, receiving probe 13, filter 14, dryer 15, rotor flow meter 16, venting main pipe 17. DETAILED DESCRIPTION

[0020] As Figures 1-2 The application discloses a water content on-line detection device for dimethyldichlorosilane hydrolysis hydrogen chloride, which comprises a gas conveying pipeline 1, wherein a cooler 2, a dryer 3 and a compressor 4 are sequentially arranged on the gas conveying pipeline 1 along a conveying direction, a gas inlet branch pipe 6 is arranged between the cooler 2 and the dryer 3, the gas inlet branch pipe 6 is connected to a water content detection mechanism 5, another gas inlet branch pipe 6 is arranged between the dryer 3 and the compressor 4, and the gas inlet branch pipe 6 is connected to another water content detection mechanism 5.

[0021] In the preferred scheme, the water content detection mechanism 5 comprises a gas chamber 12, a transmitting probe 11 and a receiving probe 13 are arranged at two ends of the gas chamber 12, a transmitting unit 9 is connected to the transmitting probe 11, and a receiving unit 10 is connected to the receiving probe 13.

[0022] In the preferred scheme, an air outlet branch pipe 8 is arranged on the water content detection mechanism 5 between the cooler 2 and the dryer 3, and the air outlet branch pipe 8 is connected to a venting pipeline 17.

[0023] An air outlet branch pipe 8 is also arranged on the water content detection mechanism 5 between the dryer 3 and the compressor 4, and the air outlet branch pipe 8 is connected to the venting pipeline 17.

[0024] In the preferred scheme, the water content detection mechanism 5 is provided with a gas inlet branch pipe 6, the gas inlet branch pipe 6 is connected to a rotor flowmeter 16 after passing through a filter 14, and then connected to one end of the gas chamber 12 close to the receiving probe 13.

[0025] The air outlet branch pipe 8 is arranged at a position of the gas chamber 12 close to the transmitting probe 11.

[0026] In the preferred scheme, an instrument air pipe 7 is further connected to the water content detection mechanism 5, a drying machine 15 is arranged on the instrument air pipe 7, and an output end of the instrument air pipe 7 is connected to a three-way ball valve before the rotor flowmeter 16.

[0027] In the preferred scheme, the transmitting unit 9 controls the transmitting probe 11 to emit laser beams with a set wavelength, the laser beams pass through gas in the gas chamber 12, a sensor of the receiving probe 13 converts optical signals into electrical signals and transmits the electrical signals to the receiving unit 10, the receiving unit 10 processes the signals and transmits the signals to the transmitting unit 9, and the transmitting unit combines temperature and pressure compensation, spectrum data and other signals to calculate the water content of the measured gas.

[0028] The water content on-line detection device for dimethyldichlorosilane hydrolysis hydrogen chloride can be used for on-line detection of the water content of gas in a hydrogen chloride conveying pipeline.

[0029] As Figure 1The sample gas enters the water content detection mechanism 5 through the gas inlet branch pipe 6 to be subjected to laser absorption and water content detection, and the absorbed gas is discharged into the exhaust gas treatment system through the gas return branch pipe 7.

[0030] In combination Figure 2 In the above process, when the gas enters the water content detection mechanism 5, the laser spectrum is narrow, and the laser beam of a specific wavelength is only absorbed by water vapor. The attenuation of the laser intensity is a certain function of the water vapor concentration. Therefore, the attenuation information of the laser intensity can be used to analyze the concentration of the measured gas.

Claims

1. An on-line water content detection device for hydrolysis of dimethyldichlorosilane hydrogen chloride, comprising a gas conveying pipeline (1), a cooler (2), a dryer (3) and a compressor (4) are sequentially arranged on the gas conveying pipeline (1) along the conveying direction, characterized in that: The gas delivery pipe (1) between the cooler (2) and the dryer (3) is provided with an air inlet branch pipe (6), which is connected to the moisture detection mechanism (5). The gas delivery pipe (1) between the dryer (3) and the compressor (4) is provided with another air inlet branch pipe (6), which is connected to another moisture detection mechanism (5).

2. The water content on-line detection device for hydrolysis of dimethyldichlorosilane hydrogen chloride according to claim 1, characterized in that: The moisture detection mechanism (5) includes a gas chamber (12), with a transmitting probe (11) and a receiving probe (13) at both ends of the gas chamber (12). The transmitting probe (11) is connected to a transmitting unit (9), and the receiving probe (13) is connected to a receiving unit (10).

3. The water content on-line detection device for hydrolysis of dimethyldichlorosilane hydrogen chloride according to claim 2, characterized in that: The moisture detection mechanism (5) between the cooler (2) and the dryer (3) is provided with an exhaust branch pipe (8), which is connected to the vent pipe (17). The moisture detection mechanism (5) between the dryer (3) and the compressor (4) is also provided with an exhaust branch pipe (8), which is connected to the vent pipe (17).

4. The water content on-line detection device for hydrolysis of dimethyldichlorosilane hydrogen chloride according to claim 3, characterized in that: The moisture detection mechanism (5) is provided with an air inlet branch pipe (6), which is connected to the rotor flow meter (16) after passing through the filter (14), and then connected to the end of the gas chamber (12) near the receiving probe (13); The gas outlet branch pipe (8) is located on the gas chamber (12) at one end near the transmitting probe (11).

5. The water content on-line detection device for hydrolysis of dimethyldichlorosilane according to claim 1, characterized in that: The moisture detection mechanism (5) is also connected to an instrument air pipe (7), and a dryer (15) is provided on the instrument air pipe (7). The output end of the instrument air pipe (7) is connected to the three-way ball valve in front of the rotor flow meter (16).

6. The water content on-line detection device for hydrolysis of dimethyldichlorosilane hydrogen chloride according to claim 2, characterized in that: The transmitting unit (9) controls the transmitting probe (11) to emit a laser of a set wavelength, which passes through the gas in the gas chamber (12). The receiving probe (13) sensor converts the optical signal into an electrical signal and transmits it to the receiving unit (10). The receiving unit (10) processes the signal and transmits it to the transmitting unit (9). The transmitting unit calculates the moisture content of the gas to be measured by combining temperature and pressure compensation and spectral data signals.

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