Method for producing SiF4 from Na2SiF6 through pyrolysis
A technology of pyrolysis and feeder, applied in the direction of silicon halide compound, halosilane, etc., can solve the problems of low conversion rate of silicon tetrafluoride, difficult removal of impurities, high production cost, etc., to solve the problem of waste of fluorine resources and production cost Low, high value-added effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Example Embodiment
[0010] Example 1
[0011] Example SiF 4 The production method, the steps are as follows:
[0012] (1) Take Na by-product of phosphate fertilizer industry 2 SiF 6 About 3kg, sent to the vacuum tray dryer via the feeder, Na 2 SiF 6 Dry in a vacuum tray dryer at 200°C for 3 hours, and the vacuum pressure in the vacuum tray dryer is controlled at -0.095MPa;
[0013] (2) Na 2 SiF 6 After vacuum drying treatment, it enters the quantitative feeder from the guide trough, in the quantitative feeder Na 2 SiF 6 The weight ratio to NaF is Na 2 SiF 6 : NaF=10:1 mixed, then sent to the high temperature circulating fluidized bed, pyrolyzed at 750℃ for 1 hour, the pressure in the high temperature circulating fluidized bed is controlled to 10mmH 2 O, pyrolysis produces NaF and SiF 4 gas;
[0014] (3) After cooling, the NaF produced by pyrolysis is returned to the quantitative feeder for reuse, and the SiF produced by pyrolysis 4 The gas is taken out by the dry vacuum pump, enters the condenser for cond...
Example Embodiment
[0015] Example 2
[0016] Example SiF 4 The production method, the steps are as follows:
[0017] (1) Take Na by-product of phosphate fertilizer industry 2 SiF 6 About 3.5kg, sent to the vacuum target dryer via the feeder, Na 2 SiF 6 Dry in a vacuum target dryer at 300°C for 2.5 hours, and the vacuum pressure in the vacuum target dryer is controlled at -0.095MPa;
[0018] (2) Na 2 SiF 6 After vacuum drying treatment, it enters the quantitative feeder from the guide trough, in the quantitative feeder Na 2 SiF 6 The weight ratio to NaF is Na 2 SiF 6 :NaF=10:3 mixed, then sent to high temperature circulating fluidized bed, pyrolyzed at 700℃ for 2 hours, the pressure in the high temperature circulating fluidized bed is controlled to 30mmH 2 O, pyrolysis produces NaF and SiF 4 gas;
[0019] (3) After cooling, the NaF produced by pyrolysis is returned to the quantitative feeder for reuse, and the SiF produced by pyrolysis 4 The gas is taken out by the dry vacuum pump, enters the condenser fo...
Example Embodiment
[0020] Example 3
[0021] Example SiF 4 The production method, the steps are as follows:
[0022] (1) Take Na by-product of phosphate fertilizer industry 2 SiF 6 About 3kg, sent to the vacuum target dryer via the feeder, Na 2 SiF 6 Dry in a vacuum target dryer at 350°C for 1 hour, and the vacuum pressure in the vacuum target dryer is controlled at -0.095MPa;
[0023] (2) Na 2 SiF 6 After vacuum drying treatment, it enters the quantitative feeder from the guide trough, in the quantitative feeder Na 2 SiF 6 The weight ratio to NaF is Na 2 SiF 6 :NaF=10:5 mixed, then sent to the high temperature reactor, pyrolyzed at 600℃ for 3 hours, the pressure in the high temperature reactor is controlled to 50mmH 2 O, pyrolysis produces NaF and SiF 4 gas;
[0024] (3) After cooling, the NaF produced by pyrolysis is returned to the quantitative feeder for reuse, and the SiF produced by pyrolysis 4 The gas is taken out by the dry vacuum pump, enters the condenser for condensation, and then passes throu...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap