CN113663445A - Synthetic dry powder dust pelletizing system of organosilicon monomer - Google Patents
Synthetic dry powder dust pelletizing system of organosilicon monomer Download PDFInfo
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- CN113663445A CN113663445A CN202110928225.3A CN202110928225A CN113663445A CN 113663445 A CN113663445 A CN 113663445A CN 202110928225 A CN202110928225 A CN 202110928225A CN 113663445 A CN113663445 A CN 113663445A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
Abstract
The invention discloses an organosilicon monomer synthesis dry powder dust removal system, which comprises a fluidized bed, wherein a synthesis gas outlet of the fluidized bed is connected with a gas-solid filter, a solid outlet at the bottom of the gas-solid filter is connected with a powder discharge tank, a discharge outlet is arranged at the bottom of the powder discharge tank, a gas outlet at the top of the gas-solid filter is connected with a condensation and height-removing tower, the condensation and height-removing tower consists of a height-removing tower stripping section, a condensation section and a rectification section, and can also be disconnected with the height-removing tower, so that organosilicon synthesis gas at the top of a dust remover is directly condensed into liquid by using circulating water and chilled water in two to three stages for separation and rectification. The gas-solid filter in the device has the advantages of simple structure and novel design, better filtering effect, longer service life, capability of greatly reducing the maintenance cost of the tool, elimination of a slurry washing tower, higher gas utilization rate, obvious reduction of production cost, realization of energy conservation and emission reduction, and great effect on environmental protection.
Description
Technical Field
The invention relates to a dust removal system for synthesizing dry powder by using an organic silicon monomer.
Background
At present, the existing fine silicon powder synthesized by organic silicon monomers is mostly collected by adopting a washing tower, a condenser, a flash tank and wet dust removal by a liquid-solid flash separation method, the working principle of a wet dust removal system is that monomer condensed liquid enters a plate-type washing tower for washing to generate organic silicon synthesized slag slurry formed by a gas-solid mixture, the organic silicon synthesized slag slurry is discharged from the bottom of the synthesis washing tower and then subjected to flash separation, high-boiling-point substance liquid can be reused as a raw material after cracking, the high-boiling-point substance liquid accounts for about 70% of the amount of the synthesized slag slurry, and the slag slurry is treated as dangerous solid waste according to a method and accounts for about 30% of the amount of the synthesized slag slurry. The wet process dust remover can be divided into two kinds, and first is vertical whirlwind water film dust remover, and its theory of operation is, adopts the tangent line to admit air, also can admit air from the center, and the water conservancy diversion piece drives and carries out rotary motion, and the water spray mode is more, for example spray, central spraying, the peripheral water spray etc. in upper portion all around. Under the action of centrifugal force, the dust is absorbed by the water film layer to discharge the polluted water, so that the purified gas can be discharged from the upper part. The rotary flow deflector of the horizontal cyclone water film dust collector is wound on the inner barrel and fixed on the inner part of the shell, so that a gap between the shell and the inner barrel is divided into a spiral channel to communicate an air inlet and an air outlet, the other common wet dust collection system adopts a wet dust collection mode that the upper end is used for removing high-boiling residues and the lower end is used for a washing tower, the process of the wet dust collection system is complicated, the efficiency is low, a mixture of 70 percent of monomers and 30 percent of solids which are difficult to treat can be generated, the effect is not good when the dust removal and the weight removal are carried out, and the requirement of environmental protection can not be well met.
Therefore, an organic silicon monomer synthesis dust removal system which can completely replace the existing wet dust removal system, can cancel a synthesis slag slurry washing tower, reduces the production cost, reduces the safety risk and achieves the effects of energy conservation, environmental protection or emission reduction is urgently needed.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides an organosilicon monomer synthesis dry powder dedusting system which can completely and effectively collect 1-30 micron fine silicon powder which can not return to a fluidized bed for reaction, and can be effectively reused after collection.
The utility model provides an organosilicon monomer synthesis dry powder dust pelletizing system, includes the fluidized bed, and the synthetic gas export of fluidized bed links to each other with gas-solid filter, and the solid export of gas-solid filter's bottom links to each other with row powder jar, and the bottom of arranging the powder jar is equipped with the bin outlet, and the gas outlet at gas-solid filter's top links to each other with condensation high-rising tower, and condensation high-rising tower is taken off by taking off high-rising tower stripping section, condensation segment, rectifying section and is constituteed.
The dry dust remover can also be disconnected with the high-altitude removal tower, and the organosilicon synthesis gas directly from the top of the dust remover is condensed into liquid through a second-level to third-level condenser by circulating water and chilled water to be separated and rectified.
Preferably, a filtering device is arranged in the gas-solid filter, the filtering device is a dust remover, the dust remover is made of high-temperature-resistant materials, and the working temperature of the high-temperature-resistant materials is 350 ℃ at the lowest.
Preferably, the condensation section adopts a shell and tube structure, a U-shaped structure or a coil structure.
Preferably, the stripping section and the rectifying section of the stripping tower adopt tower-plate structure towers.
Preferably, the stripping section and the rectifying section of the stripping tower adopt a plate tower structure.
Preferably, a top outlet of the condensation high-removal tower is connected with a first return tank through a condensation heat exchanger, the first return tank is provided with a first outlet and a second outlet, the first outlet is used for discharging light components, and the second outlet is connected with the rectifying section through a fan.
Preferably, the middle part of the rectifying section is provided with a low-boiling-point substance extraction outlet.
Preferably, the bottom of the stripping tower is provided with a discharge port and a reflux port, the reflux port is connected with a reboiler, and the outlet of the reboiler is connected with the stripping tower.
Preferably, the condensation section is a water cooling system, and the medium of the water cooling system is desalted water.
Preferably, the high-temperature resistant material of the dust removal cloth bag of the dust remover can be a stainless steel wire mesh woven material, a basalt and P84 blended material, a porous ceramic material or a powder sintered material. The manufactured dust collector, the dust collection cloth bag and the pulse and automatic back blowing system have the advantages that the dust collection cloth bag can collect fine silicon powder which is 1-30 microns and cannot return to the fluidized bed, and the effects of energy conservation, emission reduction and fine silicon powder recycling are achieved.
Preferably, a gas outlet at the top of the gas-solid filtration of the dust remover is connected with a condensation and height removal tower, and the condensation and height removal tower consists of a lifting section, a condensing section and a rectifying section of the height removal tower.
The dry dedusting system can also be disconnected with the high-altitude tower, and the organosilicon synthesis gas directly from the top of the deduster is condensed into liquid through a second-level to third-level condenser by circulating water and chilled water for separation and rectification.
Has the advantages that:
the multistage silicon powder cyclone and one or more high-temperature resistant dust collectors resistant to more than 350 ℃ of the organosilicon monomer methyl chlorosilane synthesis fluidized bed adopted by the device ensure that 1-30-grade micron fine silicon powder which cannot enter the fluidized bed for reaction is effectively collected and reused in the fluidized bed reaction process, and the effects of clean production, safety, environmental protection, energy conservation and emission reduction are completely achieved.
The system can completely replace the existing wet dust removal system, can cancel the condition that the existing organosilicon monomer production still adopts a synthetic slag slurry washing tower, effectively reduce the production cost, reduce the safety risk and achieve the effects of energy conservation, environmental protection or emission reduction.
Drawings
FIG. 1 is a schematic diagram of the general structure of a silicone monomer synthesis dry powder dust removal system;
1. a gas-solid filter dust remover 2, a fine powder collecting tank discharging tank 3, a condensation high-removing tower.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
As shown in figure 1, the organosilicon monomer synthesis dry powder dust removal system comprises a gas-solid filter dust remover 1, a fine powder collecting tank discharge tank 2, a 350 ℃ high-temperature resistant filter bag and a pulse automatic back flushing system. 3. Condensation high-removing tower 3
The utility model provides an organosilicon monomer synthesis dry powder dust pelletizing system, including the fluidized bed, the synthetic gas export of fluidized bed links to each other with gas-solid filter 1, the solid export of gas-solid filter 1's bottom links to each other with row powder jar 2, the bottom of arranging powder jar 2 is equipped with row powder mouth, the gas outlet and the condensation at gas-solid filter 1's top take off high tower 3 to link to each other, condensation takes off high tower 3 and takes off high tower by taking off high tower stripping section, the condensation segment, the rectifying section is constituteed, also can not link to each other, just carry out circulating water and refrigerated water two to tertiary condensation with the organosilicon synthetic gas at dust remover top and become liquid and separate the rectification. The separation process is easier to treat and continue to be used urgently, no additional heat energy is consumed in the separation process, circulating water consumption can be saved by more than 0.2 ton, 0.2-0.3 MPa of byproduct can be generated in each ton of monomer, 0.16-0.23 ton of steam can be generated, the separation cost is reduced, energy conservation and emission reduction are realized, and the great effect on environmental protection is achieved.
The gas-solid filter 1 is internally provided with a filtering device which is a dust remover, the filtering cloth bag of the dust remover is made of high-temperature-resistant materials, and the working temperature of the high-temperature-resistant materials is 350 ℃ at least, so that the filtering effect of the gas-solid filter 1 is better, the service life is longer, the maintenance cost of a tool can be greatly reduced, and the production cost is reduced.
The condensation section adopts a tube array type, U-shaped tube or coil tube type structure, the stripping section and the rectifying section of the stripping tower adopt regular packing or random packing, and the stripping section and the rectifying section of the stripping tower adopt a plate type tower structure, so that the working efficiency and the service life of the condensation stripping tower 3 are longer, the cost of tool maintenance can be greatly reduced, and the production cost is reduced.
The top outlet of the condensation high-removing tower 3 is connected with a first return tank through a condensation heat exchanger, the first return tank is provided with a first outlet and a second outlet, the first outlet is used for discharging light components, and the second outlet is connected with the rectifying section through a fan, so that the processing efficiency of the rectifying section is higher.
The middle part of the rectifying section is provided with a low-boiling-point substance extraction port, thereby facilitating the discharge of materials.
The bottom of stripping column is equipped with cauldron and remains export and backward flow mouth, backward flow mouth department even have a reboiler, the export of reboiler links to each other with the stripping column to realize secondary reaction, make the reaction more abundant, gas utilization is rateed highly, reduction in production cost.
The condensation section is a water cooling system, and the medium of the water cooling system is desalted water, so that efficient cooling is realized.
The high-temperature resistant material can be made of stainless steel wire mesh woven materials, basalt, P84 blended materials, porous ceramic materials or powder sintering materials, the structure is simple, the production is easy, the cost is low, the filtering and separating effect of a dust remover in the gas-solid filter 1 is better, and the minimum working temperature of the high-temperature resistant material is 350 ℃.
As shown in fig. 1, the specific working process of the organosilicon monomer synthesis dedusting and de-weighting system is as follows:
firstly, the method comprises the following steps: and a synthetic gas outlet generated by the fluidized bed reaction transmits gas into a gas-solid filter for filtering through the last stage of cyclone gas, the main components of the gas are methyl chlorosilane and methyl chloride, the temperature of an inlet of the gas-solid filter cannot be lower than 230-240 ℃, the pressure is 0.1-0.2 MPa, and the filtering pressure drop is not more than 0.02-0.05 MPa.
II, secondly: the gas enters the filtering device in the gas-solid filter, the filtering device is a dust remover, the dust removing cloth bag of the dust remover is made of high-temperature-resistant materials, the working temperature of the high-temperature-resistant materials is 350 ℃ at least, the high-temperature-resistant materials can be woven by a stainless steel wire mesh, basalt, P84 blending materials, porous ceramic materials or powder sintering materials, the structure is simple, the production is easy, the cost is low, meanwhile, the filtering and separating effect of the dust remover in the gas-solid filter is better, the service life is longer, the cost for maintaining a tool can be greatly reduced, and the production cost is reduced.
Thirdly, the method comprises the following steps: the chlorine gas and the dry fine silicon powder are generated after being filtered by a gas-solid filter and a dust removal cloth bag of the dust remover, the gas is at normal temperature or high temperature, the fine silicon powder is discharged through a powder discharge port at the bottom of the powder discharge tank 2, and the main components of the fine silicon powder are silicon and copper.
Fourthly, the method comprises the following steps: unfiltered gas in the gas-solid filter enters a condensation high-removing tower, a stripping section, a condensing section and a rectifying section of the high-removing tower in the condensation high-removing tower cool and remove the gas, the operating pressure of the condensation high-removing tower is 0.06-0.10 MPa, the operating temperature of a tower kettle is 170-190 ℃, the operating temperature of the top of the tower is 90-108 ℃, the condensing temperature of the top of the tower is 50-80 ℃, and the temperature of the top of the tower is determined by the reflux ratio of the top of the tower.
Fifthly: and after reaction in the rectifying section at the top of the tower, light components such as methyl chlorosilane, methyl chloride and the like and low-boiling residues are generated, wherein part of gas flows back to the rectifying section through a condensing heat exchanger, a reflux tank and a fan to be continuously reacted, and the light components which do not need to be continuously reacted are discharged through a first outlet.
Sixthly, the method comprises the following steps: and low-boiling-point substances generated in the rectifying section are discharged through a low-boiling-point substance extraction outlet in the middle of the rectifying section.
Seventhly, the method comprises the following steps: the condensing section is a water cooling system, and the medium of the water cooling system is desalted water, so that efficient cooling is realized.
Eighthly: the bottom of the stripping tower inside the condensation high-rise tower is provided with a kettle residue outlet and a reflux opening, the reflux opening is connected with a reboiler, the reboiler realizes secondary reaction, the reaction is more sufficient, the gas utilization rate is higher, and the production cost is reduced.
a: the synthesis gas from the last stage of the synthesis cyclone, which is the outlet of the fluidized bed reactor, comprises the main components of methyl chlorosilane and methyl chloride.
b: elutriation gas, which is chlorine gas and is at high temperature or normal temperature.
c: the dry silicon powder mainly comprises silicon and copper.
d: cracking the kettle residue and the high-boiling residues into methyl monomers or treating the methyl monomers in a subsequent hydrolysis system.
e: desalted water from a desalted water system.
f: low pressure steam to heat equipment.
g: side line extraction, low-boiling-point substance treatment in a subsequent cracking system.
h: and light components such as methyl chlorosilane, methyl chloride and the like are extracted from the tower top and enter a subsequent methyl chloride rectifying tower for separation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The organosilicon monomer synthesis dry powder dust removal system is characterized by comprising a fluidized bed, wherein a synthesis gas outlet of the fluidized bed is connected with a gas-solid filter dust remover, a solid outlet at the bottom of the gas-solid filter dust remover is connected with a powder discharge tank, and the bottom of the powder discharge tank is provided with a discharge hole.
2. The system for removing dust in organosilicon monomer synthesis dry powder of claim 1, wherein the gas outlet at the top of the gas-solid filter is connected with a condensation and stripping tower, and the condensation and stripping tower comprises a stripping section, a condensation section and a rectification section.
3. The system according to claim 1, wherein a filter device is arranged in the gas-solid filter, the filter device is a dust collector, a dust collection cloth bag and a pulse and automatic back-blowing system, the dust collection cloth bag can collect 1-30 microns of fine silicon powder which cannot return to the fluidized bed, so that the effects of energy conservation, emission reduction and fine silicon powder recycling are achieved, the dust collector and the cloth bag are made of high-temperature-resistant materials, and the working temperature of the high-temperature-resistant materials is 350 ℃ at the lowest.
4. The system for removing dust in organosilicon monomer synthesized dry powder of claim 2, wherein the condensation section is in a shell-and-tube, U-tube or coil structure.
5. The system of claim 2, wherein the stripping section and the rectifying section of the stripping column both use structured packing or random packing.
6. The system of claim 1, wherein the stripping section and the rectifying section of the de-upgrading tower are both in a plate tower structure.
7. The system for removing dust in organosilicon monomer synthesis dry powder of claim 1, wherein a top outlet of the condensation high-removal tower is connected with a first reflux tank through a condensation heat exchanger, the first reflux tank is provided with a first outlet and a second outlet, the first outlet is used for discharging light components, and the second outlet is connected with the rectifying section through a fan.
8. The system for removing dust in the synthesized dry powder of the organic silicon monomer as claimed in claim 1, wherein a low-boiling-point substance extraction port is arranged in the middle of the rectifying section of the high-boiling-point removal tower.
9. The system for removing dust in organosilicon monomer synthetic dry powder of claim 1, wherein the bottom of the stripping tower is provided with a discharge port and a reflux port, the reflux port is connected with a reboiler, and the outlet of the reboiler is connected with the stripping tower.
10. The system for removing dust in organosilicon monomer synthesis dry powder of claim 1, wherein the gas outlet at the top of the gas-solid filter is connected with a condensation and stripping tower, and the condensation and stripping tower comprises a stripping section, a condensation section and a rectification section.
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| CN202110928225.3A CN113663445A (en) | 2021-08-13 | 2021-08-13 | Synthetic dry powder dust pelletizing system of organosilicon monomer |
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| CN202110928225.3A CN113663445A (en) | 2021-08-13 | 2021-08-13 | Synthetic dry powder dust pelletizing system of organosilicon monomer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148453A (en) * | 2006-09-21 | 2008-03-26 | 蓝星化工新材料股份有限公司 | Dry dust removing method by using inorganic chlorosilane gas and device thereof |
| CN102659829A (en) * | 2012-04-27 | 2012-09-12 | 泸州北方化学工业有限公司 | Recycling method of by-products in direct method production of methyl chlorosilane |
| CN108434910A (en) * | 2018-04-02 | 2018-08-24 | 江苏金牛环保工程设备有限公司 | One kind being used for organosilicon, production of polysilicon dust removal method and its production system |
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2021
- 2021-08-13 CN CN202110928225.3A patent/CN113663445A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148453A (en) * | 2006-09-21 | 2008-03-26 | 蓝星化工新材料股份有限公司 | Dry dust removing method by using inorganic chlorosilane gas and device thereof |
| CN102659829A (en) * | 2012-04-27 | 2012-09-12 | 泸州北方化学工业有限公司 | Recycling method of by-products in direct method production of methyl chlorosilane |
| CN108434910A (en) * | 2018-04-02 | 2018-08-24 | 江苏金牛环保工程设备有限公司 | One kind being used for organosilicon, production of polysilicon dust removal method and its production system |
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