CN206955650U - A kind of purification system of fume colloidal silica production silicon tetrachloride - Google Patents
A kind of purification system of fume colloidal silica production silicon tetrachloride Download PDFInfo
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- CN206955650U CN206955650U CN201720568088.6U CN201720568088U CN206955650U CN 206955650 U CN206955650 U CN 206955650U CN 201720568088 U CN201720568088 U CN 201720568088U CN 206955650 U CN206955650 U CN 206955650U
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- silicon tetrachloride
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Abstract
The utility model discloses a kind of purification system of fume colloidal silica production silicon tetrachloride, including：Thick silicon tetrachloride storage tank；Rectifying column, thick silicon tetrachloride is purified, the silicon tetrachloride of gas phase is discharged at top, and the high-boiling components of liquid phase are discharged in bottom；First condenser, the gas phase condensation that will be discharged at the top of rectifying column, obtain purified silicon tetrachloride；Return tank, a purified silicon tetrachloride part is back at the top of rectifying column；High-boiling components medial launder, collect the liquid phase high-boiling components of rectifying column discharge；Knockout drum, the gas for discharging the first condenser is subjected to gas-liquid separation, discharges tail gas；Exhaust gas processing device；And high-boiling components processing unit.Single rectifying column is used only in the utility model purification system, simple in construction, but also has exhaust gas processing device and high-boiling components processing unit, reduces the directly outer row of pollutant, has the advantages of environmental protection is inexpensive.
Description
Technical field
Fume colloidal silica production technical field is the utility model is related to, more particularly to a kind of production of fume colloidal silica is used
The purification system of silicon tetrachloride.
Background technology
Fume colloidal silica also known as fumed silica, molecular formula：SiO2.White puff powder, porous, nontoxic nothing
Taste is pollution-free, high temperature resistant.The chemical inertness and special thixotropic property that it possesses simultaneously are obviously improved the tension of rubber
Intensity, tear resistance and wearability, intensity improves decades of times after rubber improvement.Fume colloidal silica (Fumed Silica) be by
Silicon tetrachloride or the ultra tiny unbodied dioxy with performance hydroxyl and absorption water of organic group chlorosilane pyrohydrolysis generation
SiClx powder, there is particle diameter small (only tens nanometers), specific surface area big (being more than 150m2/g), chemical purity is high, dispersive property is good
The features such as.
Silicon tetrachloride (Silicon Tetrachloride, SiCl4), is the most simple compounds that chlorine is combined with silicon, molecule
Amount：160.9, -70 DEG C of fusing point, 56.8 DEG C of boiling point.The SiCl4 of technical grade is water white transparency smokiness liquid at normal temperatures, has and stops up
Sexual stimulus smell is ceased, water intense reaction is met and resolves into silicic acid and hydrochloric acid；Can be miscible with benzene, ether, chloroform and petroleum ether,
There is severe corrosive.
At present, the source of silicon tetrachloride is mainly polysilicon by-product, and the silicon tetrachloride that it is provided contains more impurity,
Production white carbon is harmful to.The method of silicon tetrachloride purification now includes rectifying, absorption, rectifying+absorption, complexing etc., wherein essence
It is the most frequently used method to evaporate, and to improve silicon tetrachloride purity, often multiple rectifying columns are used in series.CN201770489U is disclosed
A kind of shunt-wound device for silicon tetrachloride rectification, include total storage of rectifying column and the refined silicon tetrachloride obtained for storing rectifying column
Tank, it is all provided between the rectifying column that at least two groups, every two groups of the rectifying column being joined directly together with total storage tank and total storage tank are joined directly together
It is equipped with the connecting pipeline with valve.
Also there is the purification system by chemical reaction, as what CN203959835U disclosed a kind of purifying silicon tetrachloride is
System, including：Absorption plant, there is thick silicon tetrachloride entrance, chlorine inlet, offgas outlet and absorption product outlet；Light chlorimation is anti-
Unit is answered, there is absorption product entrance and reactant exit, absorption product entrance is connected with absorption product outlet；Air-lift device,
It is connected with nitrogen inlet, reactant entrance, gas stripping gas outlet and air lift product exit, reactant entrance with reactant exit；
First rectifier unit, there is material inlet, tower top offgas outlet and the outlet of the first rectification process silicon tetrachloride, material inlet and gas
Product exit is carried to be connected；And second rectifier unit, there is the first rectification process silicon tetrachloride entrance, the outlet of purifying silicon tetrachloride
Exported with tower bottoms, the first rectification process silicon tetrachloride entrance is connected with the outlet of the first rectification process silicon tetrachloride.
Utility model content
The utility model provides a kind of purification system of fume colloidal silica production silicon tetrachloride, and the system has knot
Structure is simple, the advantages of environmental protection and energy saving and low cost.
A kind of purification system of fume colloidal silica production silicon tetrachloride, including：
Thick silicon tetrachloride storage tank；
Rectifying column, thick silicon tetrachloride is purified, the silicon tetrachloride of gas phase is discharged at top, and the height boiling of liquid phase is discharged in bottom
Thing；
First condenser, the gas phase condensation that will be discharged at the top of rectifying column, obtain purified silicon tetrachloride；
Return tank, a purified silicon tetrachloride part is back at the top of rectifying column；
High-boiling components medial launder, collect the liquid phase high-boiling components of rectifying column discharge；
Knockout drum, the gas for discharging the first condenser is subjected to gas-liquid separation, discharges tail gas；
Exhaust gas processing device；
And high-boiling components processing unit.
Preferably, the gas-liquid separator collects obtained liquid-phase reflux at the top of rectifying column.
Preferably, including for the remaining silicon tetrachloride of return tank to be condensed into four chlorinations of the second condenser and storage again
The product pans of silicon finished product.
Preferably, the high-boiling components processing unit includes the neutralization reaction groove and plate type pressure filter being sequentially connected.
Preferably, the exhaust gas processing device includes the three wastes water scrubber and caustic wash tower being sequentially connected.
Single rectifying column is used only in the utility model purification system, simple in construction, but also with exhaust gas processing device and
High-boiling components processing unit, the directly outer row of pollutant is reduced, there is the advantages of environmental protection is inexpensive.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model purification system.
Embodiment
As shown in figure 1, a kind of purification system of fume colloidal silica production silicon tetrachloride, including thick silicon tetrachloride storage tank
1st, rectifying column 2, rectifier bottoms are provided with reboiler, and reboiler gasifies thick silicon tetrachloride, and the connection first of the top of rectifying column 2 is cold
Condenser 3, the silicon tetrachloride of gasification is liquefied, condensing temperature is controlled at 53 DEG C, and the low-boiling-point substance that part is not liquefied is in the form of tail gas
Discharge.
The silicon tetrachloride of partial liquefaction is back to essence by the liquid-phase outlet connection return tank 4 of the first condenser 3, return tank 4
Evaporate the top of tower 2.Liquefied silicon tetrachloride crosses with the thick silicon tetrachloride to gasify in the middle part of tower, progress heat exchange, and liquefied four
Silicon chloride is gasified again, and high-boiling components then liquefy because of cooling, come back to reboiler.
The gaseous phase outlet connection gas-liquid separator 5 of return tank 4, because the tail gas of discharge carries four chlorinations of partial liquefaction
Silicon, by gas-liquid separator 5, the silicon tetrachloride of carrying is separated, is back to the top of rectifying column.Return tank 4 is also connected with
Silicon tetrachloride is cooled further to 38 DEG C by the second condenser 8, the second condenser 8, is then fed into product intermediate storage tank 9 and is preserved.
The tail gas outlet connection exhaust gas processing device 6 of gas-liquid separator 5, exhaust gas processing device include three wastes water scrubber 61
With caustic wash tower 62, the harmful substance among tail gas is absorbed, reaches discharge standard.The bottom of caustic wash tower 62 connects cesspool by pipeline
7, cesspool is uniformly processed after collecting sewage.
The bottom of rectifying column 2 connection high-boiling components medial launder 10, high-boiling components medial launder 10 connects high-boiling components processing unit 11, height boiling
Thing processing unit includes the neutralization chamber 111 and filter press 112 being sequentially connected, and adds aqua calcis in neutralization chamber 111, neutralizes
Acidic materials in high-boiling components, press filtration is then carried out, filtrate uniformly carries out water process, and filter residue is then used for brickmaking.
Claims (5)
- A kind of 1. purification system of fume colloidal silica production silicon tetrachloride, it is characterised in that including：Thick silicon tetrachloride storage tank；Rectifying column, thick silicon tetrachloride is purified, the silicon tetrachloride of gas phase is discharged at top, and the high-boiling components of liquid phase are discharged in bottom；First condenser, the gas phase condensation that will be discharged at the top of rectifying column, obtain purified silicon tetrachloride；Return tank, a purified silicon tetrachloride part is back at the top of rectifying column；High-boiling components medial launder, collect the liquid phase high-boiling components of rectifying column discharge；Knockout drum, the gas for discharging the first condenser is subjected to gas-liquid separation, discharges tail gas；Exhaust gas processing device；And high-boiling components processing unit.
- 2. purification system as claimed in claim 1, it is characterised in that the liquid-phase reflux that the gas-liquid separator is collected to obtain arrives At the top of rectifying column.
- 3. purification system as claimed in claim 1, it is characterised in that including for by the remaining silicon tetrachloride of return tank again Condense the second condenser and store the product pans of silicon tetrachloride finished product.
- 4. purification system as claimed in claim 1, it is characterised in that the high-boiling components processing unit is included in being sequentially connected With reactive tank and plate type pressure filter.
- 5. purification system as claimed in claim 1, it is characterised in that the exhaust gas processing device includes the three wastes being sequentially connected Water scrubber and caustic wash tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720568088.6U CN206955650U (en) | 2017-05-19 | 2017-05-19 | A kind of purification system of fume colloidal silica production silicon tetrachloride |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720568088.6U CN206955650U (en) | 2017-05-19 | 2017-05-19 | A kind of purification system of fume colloidal silica production silicon tetrachloride |
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| CN206955650U true CN206955650U (en) | 2018-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109133138A (en) * | 2018-11-06 | 2019-01-04 | 浙江富士特硅材料有限公司 | A kind of technique preparing calcium chloride using silicon tetrachloride rectifying high-boiling components hydrolysis |
-
2017
- 2017-05-19 CN CN201720568088.6U patent/CN206955650U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109133138A (en) * | 2018-11-06 | 2019-01-04 | 浙江富士特硅材料有限公司 | A kind of technique preparing calcium chloride using silicon tetrachloride rectifying high-boiling components hydrolysis |
| CN109133138B (en) * | 2018-11-06 | 2023-11-14 | 浙江富士特硅材料有限公司 | Process for preparing calcium chloride by hydrolyzing silicon tetrachloride rectification high-boiling-point substances |
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