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【Cold Conversion Technology】


Technology Overview:
JGNMT’s advanced cold conversion technology utilizes a mature fluidized bed process to produce TCS. By further optimization, investment cost is reduced; system uptime is extended; safety is improved. With significant reduction in energy and material consumption, OPEX is lower than our leading competitors. Majority of chlorosilanes in blowdowns  is recovered system for low waste generation and low emissions.
 


Brief Introduction of Process:
Cold conversion process utilizes MGSi, hydrogen, hydrogen chloride (optional) and STC as raw material and operates under 20~30 barg and 500~580 ℃. The process has a continuous feed of STC that mainly consists of recyled STC, STC from CVD and a small amount of Make-up STC. The offgas from cold conversion FBR first flows through the quench system to remove entrained silicon powder and majority of the metal chloride, while the stream is cooled and condensed. The unreacted hydrogen is recycled back to the cold conversion reactor. STC, DCS and TCS are seperated by distillation and purification. DCS can be converted into TCS by redistribution. STC is recycled back to cold conversion FBR. TCS will be sent to CVD system when it meets the CVD quality specification.
 


Reaction Formula:
Si+2H2+3SiCl4  →  4SiHCl3
 


Advantages and Features:
--Optimized Process Technology Package for better safety, maturity and advancement.
--Advanced system ensures less operational downtime with the annual uptime ≧ 80000 hours.
--The cold conversion package features a closed-loop process, where majority of chlorosilane, hydrogen chloride and hydrogen are recycled for re-utilization to reduce raw material consumption and minimize waste generation.
--Optimized FBR design and operation guarantees high conversion rate (≧26%) and throughput.
--Process design ensures stable operation and energy reduction with less system wear and plugging.
--Ultra pure TCS can be achieved after distillation; which can be used to produce EG grade polysilicon.
--Optimized recovery system maximizes the recovery of chlorosilanes, improving the reliability and stability of the system.
--The selected redistribution catalyst guarantees a high conversion rate and a long lifetime.
--Optimized system design greatly reduces customer's investment.