CN109573950A - A kind of Analytic Tower hydrogen chloride recovery system and technique - Google Patents
A kind of Analytic Tower hydrogen chloride recovery system and technique Download PDFInfo
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- CN109573950A CN109573950A CN201910098847.0A CN201910098847A CN109573950A CN 109573950 A CN109573950 A CN 109573950A CN 201910098847 A CN201910098847 A CN 201910098847A CN 109573950 A CN109573950 A CN 109573950A
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- analytic tower
- hydrogen chloride
- condenser
- tower
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/08—Compounds containing halogen
- C01B33/107—Halogenated silanes
- C01B33/10778—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0054—Hydrogen halides
- C01B2210/0057—Hydrogen chloride
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The present invention discloses a kind of Analytic Tower hydrogen chloride recovery system, including Analytic Tower, the top gaseous phase outlet of the Analytic Tower is connected to condenser group, the on-condensible gas obtained after condenser group condensation process is delivered to surge tank, the liquid phase obtained after condenser group condensation process is delivered to return tank, and liquid phase is delivered in Analytic Tower as phegma by circulating pump return in return tank.Analytic Tower hydrogen chloride recovery system structure of the present invention is simple, compact, the temperature difference of Analytic Tower liquid and recirculated water in Heat Exchanger in Circulating Water System can be effectively reduced, effectively improve the efficiency of heat exchange, reduce the consumption of recirculated water, extend the service life of Heat Exchanger in Circulating Water System, while reducing steam economy required when Analytic Tower processing absorption tower liquid, reduces production energy consumption, production cost is reduced, the utilization efficiency of heat is improved.
Description
Technical field
The present invention relates to tail gas recycle processing technology field more particularly to a kind of Analytic Tower hydrogen chloride recovery systems and work
Skill.
Background technique
The process flow of existing polysilicon tail gas separation system recycling hydrogen chloride is the tail gas for isolating chlorosilane,
Main component is hydrogen and hydrogen chloride gas, these gases, which are sent into absorption tower, absorbs the hydrogen chloride in gas by chlorosilane liquid produced
After gas, hydrogen is isolated, the chlorosilane liquid produced that hydrogen chloride is absorbed in absorption tower is sent to Analytic Tower by pressure difference, through adding
Thermal evaporation generates upflowing vapor, generates reflux in overhead condensation, finally produces hydrogen chloride in top gaseous phase, parse hydrogen chloride gas
The chlorosilane liquid produced of body passes through pumping after cooling down again and continues absorbing hydrogen chloride gas in absorption tower.The tower reactor of current Analytic Tower
135 DEG C, tower top pressure 0.95MpaG (saturated vapour pressure of hydrogen chloride) operation, the gas phase of overhead extraction enter heat exchanger condensation
Afterwards, return tank is entered back into, then recycling hydrogen chloride is vaporized by electric heater.In the presence of the process for first condensing reheating, heat waste
Seriously, production energy consumption height, low efficiency, high production cost.
Summary of the invention
The technical problems to be solved by the invention and the technical assignment of proposition are improved to the prior art, and one kind is provided
Analytic Tower hydrogen chloride recovery system solves to need first to condense reheating when recycling separating hydrogen chloride in current technology, produces energy
The problem of consumption height, low efficiency.
In order to solve the above technical problems, the technical scheme is that
The top gaseous phase outlet of a kind of Analytic Tower hydrogen chloride recovery system, including Analytic Tower, the Analytic Tower is connected to
Condenser group, the on-condensible gas obtained after condenser group condensation process are delivered to surge tank, at condenser group condensation
The liquid phase obtained after reason is delivered to return tank, and liquid phase is delivered to Analytic Tower by circulating pump return as phegma in return tank
It is interior.The gas phase output of Analytic Tower is carried out condensation and is directly isolated to obtain conduct by Analytic Tower hydrogen chloride recovery system of the present invention
The liquid phase and fixed gas of phegma, fixed gas include the hydrogen chloride of gas phase, export the gas phase of Analytic Tower without such as traditional approach
Vaporization separation is reheated after being all condensed into liquid phase, without vaporizer is arranged again, eliminates the processing for first condensing reheating
Process, heat needed for saving heating vaporization, avoids energy waste, reduces production energy consumption, and simplified system component reduces system
Cost.
Further, the tower reactor running temperature of the Analytic Tower is 80~90 DEG C, and tower top pressure is 0.2~0.4MPaG.
The running temperature and pressure for reducing Analytic Tower, reduce the heating power consumption of Analytic Tower, can reduce the boiling point of hydrogen chloride, will parse
The gas phase output of tower can directly efficiently separate out the liquid phase and fixed gas as phegma when being condensed, no longer need to using biography
The gas phase output of Analytic Tower is all condensed into after liquid phase and reheats vaporization separation by system mode, and simplified system component reduces production
Energy consumption.
Further, the tower reactor running temperature of the Analytic Tower is 87.1 DEG C, tower top pressure 0.3MPaG.
Further, the liquid phase in the return tank is dichlorosilane, and dichlorosilane is transmitted back to as phegma
In Analytic Tower, the concentration of component that tower top distills out if not flowing back can be lower and lower, and the bottom temperature of Analytic Tower increases fast difficult
With control, have reflux then can it is good control Analytic Tower temperature and overhead components concentration, by being transmitted back to Analytic Tower phegma
To ensure parsing separating effect and energy consumption.
Further, the condenser group is in series by several condensers, and the top gaseous phase outlet of Analytic Tower is defeated
Gas phase out is successively passed through several condensers, improves the condensation adequacy to phegma, improves the separating effect to fixed gas,
Improve the purity of obtained fixed gas.
Further, the condenser group is in series by four condensers, along the stream of the gas phase of Analytic Tower output
Road direction is followed successively by first-stage condenser, secondary condenser, three-level condenser and level Four condenser, first-stage condenser, B-grade condensation
The liquid-phase outlet of device, three-level condenser and level Four condenser is connected to return tank, the gas of the level Four condenser by pipeline
Mutually outlet is back to secondary condenser by pipeline, and setting fixed gas, which is exported, on secondary condenser is connected to buffering by pipeline
Tank.The gas phase output of Analytic Tower is effectively condensed, isolated liquid phase and fixed gas as phegma, raising is isolated
Fixed gas purity.
Further, it is connected with reboiler for heating on the Analytic Tower, is heated by reboiler, make to solve
Tower bottom temperature is analysed to keep stablizing.
A kind of Analytic Tower hydrogen chloride recovery process, hydrogen chloride and dichlorosilane be heated in Analytic Tower gasification after from
Parsing column overhead is transported to condenser group and carries out condensation process, and dichlorosilane collects after being condensed into liquid phase and as phegma
It is transmitted back to Analytic Tower, hydrogen chloride is not in hydrogen chloride the coagulating from condenser group for remaining as gas phase after condenser group condensation process
Port is sent out, and the hydrogen chloride of gas phase is collected.It no longer needs to that the gas phase output of Analytic Tower is all condensed into liquid phase using traditional approach
Vaporization separation is reheated afterwards, without vaporizer is arranged again, is eliminated the process for first condensing reheating, is saved heating vapour
Heat needed for changing avoids energy waste, reduces production energy consumption, and simplified system component reduces the cost of system.
Further, the tower reactor running temperature of the Analytic Tower is 87.1 DEG C, tower top pressure 0.3MPaG, reduces parsing
The gas phase output of Analytic Tower is being carried out condensation Shi Nengzhi so as to reduce the boiling point of hydrogen chloride by the running temperature and pressure of tower
The liquid phase and fixed gas for being effectively separated as phegma are connect, fixed gas is mainly the hydrogen chloride of gas phase, saves traditional work
Thermal energy needed for heating vaporization, reduces production energy consumption in skill.
Further, the hydrogen chloride and dichlorosilane for the gas phase that parsing column overhead is sent out are passed sequentially through by several condensations
Device condenser group in series, collects the dichlorosilane for the liquid phase that each condenser condenses and is transmitted back to Analytic Tower,
The adequacy of dichlorosilane condensation is improved, hydrogen chloride and dichlorosilane separating effect are improved.
Compared with prior art, the invention has the advantages that:
Analytic Tower hydrogen chloride recovery system structure of the present invention is simple, compact, and the gas phase of Analytic Tower is exported and is carried out
Condensation is directly isolated to obtain liquid phase and fixed gas as phegma, eliminates first condensation and reheats the isolated processing side of vaporization
Formula, heat needed for saving heating vaporization, avoids energy waste, reduces production energy consumption, simplified system component, reduce system at
This.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Analytic Tower hydrogen chloride recovery system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of Analytic Tower hydrogen chloride recovery system disclosed by the embodiments of the present invention reduces Analytic Tower operating pressure and temperature,
The gas phase that Analytic Tower generates, which directly passes through condensation, may separate out the hydrogen chloride of gas phase, no longer needs to setting electric heating carburetor, subtracts
The steam consumption of few Analytic Tower, reduces production energy consumption, reduces production cost.
A kind of Analytic Tower hydrogen chloride recovery process, hydrogen chloride and dichlorosilane be heated in Analytic Tower gasification after from
Parsing column overhead is transported to condenser group and carries out condensation process, is directly separated hydrogen chloride and dichlorosilane by condensing, two
Chlorine dihydro silicon is condensed into liquid phase, and hydrogen chloride is remaining as gas phase by condenser group, after dichlorosilane is condensed into liquid phase
It collects and is transmitted back to Analytic Tower as phegma, hydrogen chloride is in the hydrogen chloride for remaining as gas phase after condenser group condensation process
It is sent out from the fixed gas mouth of condenser group, collects the hydrogen chloride of gas phase.
In order to ensure that hydrogen chloride and dichlorosilane dichlorosilane when by condenser group condensation process are condensed into liquid
Mutually and hydrogen chloride remains as gas phase, need to control the operating temperature and pressure of Analytic Tower, the tower reactor of setting Analytic Tower (1) runs temperature
Degree is 80~90 DEG C, and tower top pressure is 0.2~0.4MPaG, it is preferred that the tower reactor running temperature of Analytic Tower is 87.1 DEG C, tower top
Pressure is 0.3MPaG, then the isolated liquid phase that the top gaseous phase output of Analytic Tower can be stable after being handled by condenser group
Dichlorosilane and gas phase hydrogen chloride.
In order to improve the separating effect of hydrogen chloride and dichlorosilane, the purity for the hydrogen chloride isolated is improved, needs to make
Dichlorosilane is sufficiently condensed into liquid phase, and condenser group is connected in series using multi-stage condensing device, the gas phase that parsing column overhead is sent out
Hydrogen chloride and dichlorosilane pass sequentially through several condensers, collect the dichloro two for the liquid phase that each condenser condenses
Hydrogen silicon is simultaneously transmitted back to Analytic Tower, collects the fixed gas sent out from the fixed gas mouth of condenser group, fixed gas is used for other productions
In.
Analytic Tower hydrogen chloride recovery system based on above-mentioned Analytic Tower hydrogen chloride recovery process is as shown in Figure 1, mainly include
Analytic Tower 1, the tower reactor running temperature of Analytic Tower 1 are 87.1 DEG C, tower top pressure 0.3MPaG, reduce the heating function of Analytic Tower 1
The top gaseous phase outlet of consumption, the Analytic Tower 1 is connected to condenser group 2, obtains not after 2 condensation process of condenser group
Solidifying gas is delivered to surge tank 3, and on-condensible gas is the gaseous mixture of hydrogen chloride and hydrogen, can supplying cold directly hydrogenation produce and use, warp
It crosses the liquid phase obtained after 2 condensation process of condenser group and is delivered to return tank 4, liquid phase passes through circulation as phegma in return tank 4
Pump 5 is returned and is delivered in Analytic Tower 1, and the liquid phase in return tank 4 is dichlorosilane, and dichlorosilane is transmitted back to as phegma
In Analytic Tower 1, dichlorosilane and hydrogen chloride are sent after being gasified in Analytic Tower to condenser group 2.
In the present embodiment, condenser group 2 is in series by four condensers, and the top gaseous phase of Analytic Tower 1 exports output
Gas phase be successively passed through four condensers, be followed successively by first-stage condenser 21, two along the runner direction of gas phase that Analytic Tower 1 exports
Grade condenser 22, three-level condenser 23 and level Four condenser 24, first-stage condenser 21, secondary condenser 22, three-level condenser 23
Return tank 4 is connected to by pipeline with the liquid-phase outlet of level Four condenser 24, the gaseous phase outlet of the level Four condenser 24 is logical
Piping is back to secondary condenser 22, and setting fixed gas, which is exported, on secondary condenser 22 is connected to surge tank 3 by pipeline, right
The gas phase output of Analytic Tower is effectively condensed, and isolated liquid phase and fixed gas as phegma is improved and isolated not
The purity of solidifying gas.
It is connected with reboiler 6 for heating on Analytic Tower 1, the operating temperature of Analytic Tower 1, institute are controlled by reboiler 6
The reboiler stated can be Vertical Thermosyphon Reboiler, horizontal thermosiphon reboiler, kettle type reboiler, forced cyclic type reboiler
It is one such with built-in reboiler.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (10)
1. a kind of Analytic Tower hydrogen chloride recovery system, including Analytic Tower (1), which is characterized in that the tower top of the Analytic Tower (1)
Gaseous phase outlet is connected to condenser group (2), and the on-condensible gas obtained after condenser group (2) condensation process is delivered to surge tank
(3), the liquid phase obtained after condenser group (2) condensation process is delivered to return tank (4), and return tank (4) interior liquid phase is used as back
Flow liquid is returned by circulating pump (5) and is delivered in Analytic Tower (1).
2. Analytic Tower hydrogen chloride recovery system according to claim 1, which is characterized in that the tower of the Analytic Tower (1)
Kettle running temperature is 80~90 DEG C, and tower top pressure is 0.2~0.4MPaG.
3. Analytic Tower hydrogen chloride recovery system according to claim 2, which is characterized in that the tower of the Analytic Tower (1)
Kettle running temperature is 87.1 DEG C, tower top pressure 0.3MPaG.
4. Analytic Tower hydrogen chloride recovery system according to claim 1, which is characterized in that in the return tank (4)
Liquid phase is dichlorosilane, and dichlorosilane is transmitted back in Analytic Tower (1) as phegma.
5. Analytic Tower hydrogen chloride recovery system according to claim 1, which is characterized in that the condenser group (2) by
Several condensers are in series, and the gas phase of the top gaseous phase outlet output of Analytic Tower (1) is successively passed through several condensers.
6. Analytic Tower hydrogen chloride recovery system according to claim 3, which is characterized in that the condenser group (2) by
Four condensers are in series, are followed successively by first-stage condenser (21), second level along the runner direction of the gas phase of Analytic Tower (1) output
Condenser (22), three-level condenser (23) and level Four condenser (24), first-stage condenser (21), secondary condenser (22), three-level
The liquid-phase outlet of condenser (23) and level Four condenser (24) is connected to return tank (4) by pipeline, the level Four condenser
(24) gaseous phase outlet is back to secondary condenser (22) by pipeline, and fixed gas outlet is arranged on secondary condenser (22) and passes through
Pipeline is connected to surge tank (3).
7. Analytic Tower hydrogen chloride recovery system according to any one of claims 1 to 6, which is characterized in that the parsing
Reboiler for heating (6) are connected on tower (1).
8. a kind of Analytic Tower hydrogen chloride recovery process, which is characterized in that hydrogen chloride and dichlorosilane are heated in Analytic Tower
Analytically column overhead is transported to condenser group and carries out condensation process after to gasification, and dichlorosilane is collected simultaneously after being condensed into liquid phase
Analytic Tower is transmitted back to as phegma, and hydrogen chloride is in the hydrogen chloride for remaining as gas phase after condenser group condensation process from condensation
The fixed gas mouth of device group is sent out, and the hydrogen chloride of gas phase is collected.
9. Analytic Tower hydrogen chloride recovery process according to claim 8, which is characterized in that the tower reactor of the Analytic Tower is run
Temperature is 87.1 DEG C, tower top pressure 0.3MPaG.
10. Analytic Tower hydrogen chloride recovery process according to claim 8, which is characterized in that the gas that parsing column overhead is sent out
The hydrogen chloride and dichlorosilane of phase pass sequentially through the condenser group in series by several condensers, collect each condenser
It condenses the dichlorosilane of obtained liquid phase and is transmitted back to Analytic Tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910098847.0A CN109573950A (en) | 2019-01-31 | 2019-01-31 | A kind of Analytic Tower hydrogen chloride recovery system and technique |
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| CN201910098847.0A CN109573950A (en) | 2019-01-31 | 2019-01-31 | A kind of Analytic Tower hydrogen chloride recovery system and technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113398619A (en) * | 2020-03-17 | 2021-09-17 | 北京诺维新材科技有限公司 | Method for improving distillation separation effect and distillation system |
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