CN210473505U - Cascade absorption equipment for treating methyl chlorosilane tail gas - Google Patents
Cascade absorption equipment for treating methyl chlorosilane tail gas Download PDFInfo
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- CN210473505U CN210473505U CN201920794370.5U CN201920794370U CN210473505U CN 210473505 U CN210473505 U CN 210473505U CN 201920794370 U CN201920794370 U CN 201920794370U CN 210473505 U CN210473505 U CN 210473505U
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Abstract
The utility model discloses a handle step absorption equipment of methyl chlorosilane tail gas. The device comprises a Venturi scrubber, two sections of scrubbing towers, a blower, two water storage tanks and a pump, wherein a No. 1 water storage tank and a No. 2 water storage tank are respectively arranged below the Venturi scrubber and the scrubbing towers, and the two sections of scrubbing towers divide the scrubbing towers into an upper tower and a lower tower through air lifting discs; a baffle plate is arranged in the lower tower, a tower bottom circulating pump is arranged at the bottom of the lower tower, and the absorption liquid in the No. 2 water storage tank is circulated to the top of the lower tower for recycling; the upper tower is internally provided with random packing or a flow-through tower plate, the upper tower is provided with a middle circulating pump, and the liquid on the gas-lifting disc is circulated to the top or the middle part of the upper tower; an absorption liquid pump is arranged between the 2# water storage tank and the Venturi scrubber; the upper parts of the two water storage pools are additionally provided with cover plates to form a semi-closed structure, and the cover plates are provided with fan pipeline interfaces to be connected with the air blower. The utility model discloses not only reduce the jam problem of tower, improved the efficiency of getting rid of methyl chlorosilane and hydrolysate hydrogen chloride and siloxane in the tail gas moreover, guaranteed that exhaust emission is up to standard.
Description
Technical Field
The utility model belongs to the tail gas treatment field, concretely relates to handle step absorption technology and equipment of methyl chlorosilane tail gas.
Background
The organic silicon is a novel polymer material with excellent performance and unique function, and is widely applied to the fields of spaceflight, aviation, automobiles, combat vehicles, ships, buildings, electronics, electricity, textiles, papermaking, medical sanitation, food, daily chemicals and the like. During the production and storage of organosilicon, a large amount of tail gas containing methyl chlorosilane can be generated, if the tail gas is directly discharged without being treated, serious safety accidents can be caused, and serious environmental pollution can be caused. The traditional method for treating methyl chlorosilane tail gas is a primary water absorption method, and the absorption process is mainly carried out in a washing tower, however, the process has certain defects. Since the absorption process is chemical absorption, methylchlorosilane is hydrolyzed to produce siloxane and hydrogen chloride. Among them, siloxane is very easily polymerized, and if a common packing and a tray are used, a column blockage phenomenon is easily caused. In order to solve the problem of tower blockage, a baffling tray is usually adopted, but the mass transfer efficiency in the absorption process is limited, so that the vent gas has pungent smell. In order to make methyl chlorosilane tail gas up to standard, must very big liquid-gas ratio and a large amount of tower trays, and directly adopt the scrubbing tower to handle, the tail gas volume is great, and the scrubbing tower equipment size is very big to cause equipment investment big, the operating cost is high, has also increased later stage waste water treatment cost simultaneously. On the other hand, in the conventional absorption process, the absorption liquid storage tank is arranged in an open manner, and siloxane, hydrogen chloride and the like in the absorption liquid storage tank are volatilized into the atmosphere due to the exothermic effect of chemical absorption and the change of the environmental temperature, so that pungent odor is generated, and the atmospheric environment is polluted.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a handle step absorption equipment of methyl chlorosilane tail gas. Through the utility model provides a method can hydrolyze the methyl chlorosilane in the tail gas in grades to guarantee that the hydrogen chloride concentration in the tail gas reduces to emission standard. Compare with traditional absorption equipment, the utility model discloses not only can improve absorption process mass transfer efficiency, also avoided the equipment jam problem that appears in the absorption process and the diffuse phenomenon of equipment district irritability smell.
Realize the utility model discloses the technical scheme of purpose is:
a cascade absorption device for processing methyl chlorosilane tail gas is characterized by comprising a Venturi scrubber, two sections of scrubbing towers, an air blower, two water storage tanks and a pump, wherein a No. 1 water storage tank and a No. 2 water storage tank are respectively arranged below the Venturi scrubber and the scrubbing towers, and the two sections of scrubbing towers divide the scrubbing towers into an upper tower and a lower tower through air lifting discs; a baffle plate is arranged in the lower tower, a tower bottom circulating pump is arranged at the bottom of the lower tower, and the absorption liquid in the No. 2 water storage tank is circulated to the top of the lower tower for recycling; the upper tower is internally provided with random packing or a flow-through tower plate, the upper tower is provided with a middle circulating pump, and the liquid on the gas-lifting disc is circulated to the top or the middle part of the upper tower; an absorption liquid pump is arranged beside the 2# water storage tank, and the absorption liquid in the 2# water storage tank is sent to the inlet of the Venturi scrubber; an absorption liquid pump is arranged between the 2# water storage tank and the Venturi scrubber; the cover plate is additionally arranged on the upper portions of the two water storage tanks to form a semi-closed structure, the fan pipeline interface is arranged on the cover plate and connected with the air blower, and gases such as hydrogen chloride, siloxane and the like volatilized from the two water storage tanks are sent to the lower tower bottom of the washing tower through the air blower to be absorbed, so that the gases are prevented from diffusing to the atmosphere to generate pungent smell.
A step absorption equipment for treating methyl chlorosilane tail gas is characterized in that: the Venturi scrubber adopts an adjustable throat, and in the Venturi scrubber, the turbulence degree of the methyl chlorosilane tail gas is controlled through the adjustable throat according to the actual working condition, and the methyl chlorosilane tail gas is in multistage countercurrent contact with the absorption liquid.
A step absorption equipment for treating methyl chlorosilane tail gas is characterized in that: the upper tower and the lower tower can be divided into two towers.
Compared with the prior art, the utility model discloses can carry out the step to methyl chlorosilane tail gas and handle, its unique part has:
1) a Venturi scrubber is adopted to strengthen the processes of chemical absorption and hydrolysate separation, most of methyl chlorosilane in high-concentration methyl chlorosilane tail gas is absorbed, and hydrolysate is smoothly discharged, so that the problem of system blockage caused by siloxane polymerization of the hydrolysate is effectively solved, and the operation load of a subsequent washing tower is reduced.
2) Two sections of washing towers are adopted to absorb the low-concentration methyl chlorosilane tail gas. And a baffle plate is adopted as a mass transfer element in the lower tower of the washing tower, so that the methyl chlorosilane residual in the tail gas is further absorbed, and hydrolysis products are discharged. In the upper tower of the washing tower, random packing or flow-through tower plates are used as mass transfer elements to strengthen the absorption process, so that the discharged tail gas has no pungent smell.
3) The cover plate is arranged on the lower water storage tank, and the gas on the upper part of the water tank is conveyed to the bottom of the lower tower of the washing tower to be absorbed, so that the generation of nonirritant smell in the whole device area is ensured, and the requirement of environmental protection is met.
4) Wherein, the liquid containing the gel-packed siloxane is mainly concentrated in a No. 1 water storage tank, so that the cleaning is convenient.
5) Wherein, alkali liquor is injected into the top of the upper tower of the washing tower, thereby improving the absorption effect of the hydrogen chloride in the tail gas.
Drawings
Fig. 1 is a schematic structural diagram of the apparatus of the present invention.
The reference numbers illustrate: 1-a venturi scrubber; 2-1# pool; 3-absorption liquid pump; 4-a blower; 5-a middle circulating pump; 6-two sections of washing towers; 7-2# water storage tank; 8-tower bottom circulating pump; 9-cover plate.
Detailed Description
The technical and equipment operating characteristics of the present invention will be further explained with reference to the accompanying drawings.
As shown in figure 1, the cascade absorption equipment for treating methyl chlorosilane tail gas comprises a Venturi scrubber 1, two sections of washing towers 6, a blower 4, two water storage tanks, a pump and other matched equipment. A No. 1 water storage tank 2 and a No. 2 water storage tank 7 are respectively arranged below the Venturi scrubber 1 and the washing tower 6, and the two sections of washing towers 6 divide the washing towers into an upper tower and a lower tower through air lifting discs; a baffle plate is arranged in the lower tower, a tower bottom circulating pump 8 is arranged at the bottom of the lower tower, and the absorption liquid in the No. 2 water storage tank 7 is circulated to the top of the lower tower for recycling; the upper tower is internally provided with random packing or a flow-through tower plate, the upper tower is provided with a middle circulating pump 5, and the liquid on the gas-lifting disc is circulated to the top or the middle part of the upper tower; an absorption liquid pump 3 is arranged between the 2# water storage tank 7 and the Venturi scrubber 1; cover plate 9 is installed additional on two tank upper portions, forms semi-enclosed construction to set up fan pipeline interface and be connected with air-blower 4 on cover plate 9, send into the gas such as hydrogen chloride and siloxane that two tank volatilize through air-blower 4 and absorb at the bottom of the tower under the scrubbing tower, prevent that it from diffusing to produce pungent smell in the atmosphere.
A cascade absorption method for treating methyl chlorosilane tail gas is implemented by the following steps:
1) the methyl chlorosilane tail gas is contacted with absorption liquid from a No. 2 water storage tank in a Venturi scrubber through a gas buffer tank, more than 90% of methyl chlorosilane in the tail gas is hydrolyzed and absorbed, a hydrolysis product is transferred into the absorption liquid, and meanwhile, the absorption liquid is discharged into the No. 1 water storage tank through the bottom of the Venturi scrubber;
2) the methyl chlorosilane discharged from the Venturi scrubber enters the bottom of a lower tower of the two-section washing tower to be absorbed, a baffle plate is adopted in the lower tower of the washing tower as a mass transfer element, the methyl chlorosilane residual in tail gas, siloxane and hydrogen chloride generated by hydrolysis are further absorbed, hydrolysis products are discharged, absorption liquid is discharged into a No. 2 water storage tank, and meanwhile, a circulating pump at the bottom of the tower circulates the absorption liquid in the No. 2 water storage tank to the top of the lower tower to be recycled;
3) methyl chlorosilane tail gas which is discharged from a lower tower of the washing tower enters an upper tower of the washing tower through a gas lifting disc, random packing or a cross-flow tower plate is used as a mass transfer element to strengthen the absorption process, at the moment, the concentration of hydrogen chloride in the tail gas is very low, alkali liquor is injected from a pipe network and sprayed from the top of the upper tower, the hydrogen chloride at the top of the tower is neutralized, the hydrogen chloride in the tail gas is further absorbed and discharged after reaching the standard, and meanwhile, a middle circulating pump circulates liquid on the gas lifting disc to the top or the middle of the upper tower.
The utility model provides a handle step absorption equipment of methyl chlorosilane tail gas has been described through the implementation case, and relevant technical personnel obviously can not deviate from the utility model discloses content, spirit and within range change and suitable change and combination realize to structure and equipment that this paper said the utility model discloses. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.
Claims (3)
1. A step absorption device for processing methyl chlorosilane tail gas is characterized by comprising a Venturi scrubber (1), two sections of scrubbing towers (6), an air blower (4), two water storage tanks and a pump, wherein a No. 1 water storage tank (2) and a No. 2 water storage tank (7) are respectively arranged below the Venturi scrubber (1) and the scrubbing towers (6), and the scrubbing towers are divided into an upper tower and a lower tower by the two sections of scrubbing towers (6) through air lifting discs; a baffle plate is arranged in the lower tower, a tower bottom circulating pump (8) is arranged at the bottom of the lower tower, and the absorption liquid in the No. 2 water storage tank (7) is circulated to the top of the lower tower for recycling; the upper tower is internally provided with random packing or a flow-through tower plate, the upper tower is provided with a middle circulating pump (5), and the liquid on the gas-lifting disc is circulated to the top or the middle part of the upper tower; an absorption liquid pump (3) is arranged between the 2# water storage tank (7) and the Venturi scrubber (1); cover plate (9) are installed on the upper portions of the two water storage tanks to form a semi-closed structure, a fan pipeline interface is arranged on the cover plate (9) and connected with an air blower (4), hydrogen chloride and siloxane gas volatilized from the two water storage tanks are sent to the bottom of the lower tower of the washing tower through the air blower (4) to be absorbed, and the hydrogen chloride and the siloxane gas are prevented from diffusing to the atmosphere to generate pungent smell.
2. The cascade absorption equipment for treating methyl chlorosilane tail gas as claimed in claim 1, wherein the equipment comprises the following components in parts by weight: the Venturi scrubber (1) adopts an adjustable throat pipe, and in the Venturi scrubber, according to actual working conditions, the turbulence degree of methyl chlorosilane tail gas is controlled through the adjustable throat pipe and is in multi-stage countercurrent contact with absorption liquid.
3. The cascade absorption equipment for treating methyl chlorosilane tail gas as claimed in claim 1, wherein the equipment comprises the following components in parts by weight: the upper tower and the lower tower can be divided into two towers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920794370.5U CN210473505U (en) | 2019-05-29 | 2019-05-29 | Cascade absorption equipment for treating methyl chlorosilane tail gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920794370.5U CN210473505U (en) | 2019-05-29 | 2019-05-29 | Cascade absorption equipment for treating methyl chlorosilane tail gas |
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| CN210473505U true CN210473505U (en) | 2020-05-08 |
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| CN201920794370.5U Active CN210473505U (en) | 2019-05-29 | 2019-05-29 | Cascade absorption equipment for treating methyl chlorosilane tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559678A (en) * | 2021-07-31 | 2021-10-29 | 湖北兴瑞硅材料有限公司 | Evacuation tail gas absorption device and process for organic silicon vacuum unit |
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2019
- 2019-05-29 CN CN201920794370.5U patent/CN210473505U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559678A (en) * | 2021-07-31 | 2021-10-29 | 湖北兴瑞硅材料有限公司 | Evacuation tail gas absorption device and process for organic silicon vacuum unit |
| CN113559678B (en) * | 2021-07-31 | 2023-07-25 | 湖北兴瑞硅材料有限公司 | Device and process for absorbing exhaust gas of organic silicon vacuum unit |
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