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Patent Searching and Data


Title:
FLUIDIZED BED REACTOR AND METHOD FOR PRODUCING GRANULAR POLYSILICON
Document Type and Number:
WIPO Patent Application WO/2014/177377
Kind Code:
A3
Abstract:
The invention relates to a method for producing granular polysilicon in a fluidized bed reactor, having the steps of fluidizing silicon particles by means of a gas flow in a fluidized bed, said gas flow being heated to a temperature of 850-1100°C by a heating device, adding a silicon-containing reaction gas by means of at least one nozzle, and depositing silicon onto the silicon particles. The invention is characterized in that in at least 56% of an axially symmetrical region about a nozzle opening of the at least one nozzle, a reaction gas concentration equals more than 75% of a maximum concentration of the reaction gas (10 to 50 mol%), a fluidized bed temperature is higher than 95% of a fluidized bed temperature outside of the axially symmetrical region (850-1100°C), and a solids concentration is more than 85% of a solids concentration at the edge of the fluidized bed (55 to 90 vol%).

Inventors:
WECKESSER DIRK (DE)
HERTLEIN HARALD (DE)
Application Number:
PCT/EP2014/057655
Publication Date:
January 08, 2015
Filing Date:
April 15, 2014
Export Citation:
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Assignee:
WACKER CHEMIE AG (DE)
International Classes:
B01J8/18; C01B33/03
Foreign References:
US20080299291A12008-12-04
DE102005042753A12007-03-15
US7927984B22011-04-19
US20120230903A12012-09-13
Attorney, Agent or Firm:
KILLINGER, Andreas et al. (Hanns-Seidel-Platz 4, München, DE)
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