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Methylsiloxane cracking tail gas purification treatment system and treatment method

A methylsiloxane and tail gas purification technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of vacuum pump operation influence, gas VOC exceeding the standard, etc., and achieve improved operation stability, extended life, The effect of reducing production costs

Pending Publication Date: 2022-07-15
合盛硅业(泸州)有限公司
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  • Description
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  • Application Information

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Problems solved by technology

This not only affects the operation of the vacuum pump, but also causes a large amount of organic matter in the released gas, which will cause the gas VOC to exceed the standard

Method used

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  • Methylsiloxane cracking tail gas purification treatment system and treatment method

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Embodiment 1

[0028] like figure 1 As shown, this embodiment provides a methylsiloxane pyrolysis tail gas purification treatment system, including an absorption liquid buffer tank 1, an absorption liquid circulation pump 2, an absorption liquid condenser 3, a gas-liquid separator 4 and a first vacuum pump 5 , the absorption liquid buffer tank 1, the absorption liquid circulating pump 2, the absorption liquid condenser 3 and the gas-liquid separator 4 are connected in turn to form a closed loop, the absorption liquid buffer tank 1 and the first vacuum pump 5 form a circulation loop, and the first vacuum pump 5 and the absorption liquid A first vacuum pump buffer tank 51 is arranged between the liquid buffer tank 1, a balance pipe 11 is arranged between the absorption liquid buffer tank 1 and the first vacuum pump 5, and also includes a second vacuum pump 6, the second vacuum pump 6 and the first vacuum pump 5 In parallel, a second vacuum pump buffer tank 61 is arranged between the second vac...

Embodiment 2

[0030] This embodiment provides a method for purifying and treating methylsiloxane cracking tail gas, that is, a method for using the methylsiloxane cracking tail gas purification and treatment system provided in Example 1, as follows:

[0031] In the process of use, it is necessary to inject the absorption liquid (D in the absorption liquid) into the absorption liquid buffer tank in advance. 5 When the liquid level of the absorption liquid buffer tank reaches 60%, start the absorption liquid circulation pump to circulate the system, and the absorption liquid flows through the absorption liquid condenser and gas-liquid separator, and finally returns to the absorption liquid liquid buffer tank. After normal circulation, the pressure of the absorption liquid buffer tank is pumped to a negative pressure of more than 70kPa through the balance pipe at the top of the absorption liquid buffer tank. After the pressure reaches the condition, the vacuum line of the methylsiloxane cracki...

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Abstract

The invention relates to the technical field of tail gas purification treatment, and provides a methylsiloxane cracking tail gas purification treatment system which comprises an absorption liquid buffer tank, an absorption liquid circulating pump, an absorption liquid condenser, a gas-liquid separator and a first vacuum pump, the absorption liquid buffer tank, the absorption liquid circulating pump, the absorption liquid condenser and the gas-liquid separator are sequentially communicated to form a closed loop, and the absorption liquid buffer tank and the first vacuum pump form a circulating loop; the methylsiloxane cracking tail gas purification treatment system provided by the invention has the following advantages: 1, D3 which is not condensed can be effectively absorbed, so that the recycling rate of methylsiloxane is increased, and the production cost is reduced; 2, as the content of D3 entering the vacuum pump is reduced, the service life of the vacuum pump is prolonged; 3, the D3 is absorbed at the front end of the vacuum pump, so that the flowing path of the D3 is shortened, and the operation stability of the system is improved; and 4, the content of D3 released into the atmosphere is reduced, and the emission amount of VOC in a factory is controlled.

Description

technical field [0001] The invention relates to the technical field of tail gas purification and treatment, in particular to a methylsiloxane cracking tail gas purification treatment system and a treatment method. Background technique [0002] Cyclic dimethylsiloxane is mainly obtained by catalytic cracking of linear methylsiloxane under the conditions of negative pressure and temperature control of 135-145 degrees Celsius. The negative pressure of the system is obtained by the water ring vacuum pump and the Roots vacuum pump. During the vacuuming process, a small amount of non-condensable gas and gas that will not be cooled in the future will be pumped to the vacuum pump. When this part of the gas passes through the vacuum pump, it will be condensed due to the instantaneous change of the vacuum pump pressure, and some cannot be condensed. The vent of the vacuum pump is released to the atmosphere. These gases brought to the pump head by the vacuum pump contain a large amou...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D53/18
CPCB01D53/002B01D53/18
Inventor 张楠王刚刘成彬汪令杰唐年华李新欣高帅
Owner 合盛硅业(泸州)有限公司
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